Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1 | /* |
| 2 | * iSCSI Initiator over TCP/IP Data-Path |
| 3 | * |
| 4 | * Copyright (C) 2004 Dmitry Yusupov |
| 5 | * Copyright (C) 2004 Alex Aizman |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 6 | * Copyright (C) 2005 - 2006 Mike Christie |
| 7 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 8 | * maintained by open-iscsi@googlegroups.com |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published |
| 12 | * by the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * See the file COPYING included with this distribution for more details. |
| 21 | * |
| 22 | * Credits: |
| 23 | * Christoph Hellwig |
| 24 | * FUJITA Tomonori |
| 25 | * Arne Redlich |
| 26 | * Zhenyu Wang |
| 27 | */ |
| 28 | |
| 29 | #include <linux/types.h> |
| 30 | #include <linux/list.h> |
| 31 | #include <linux/inet.h> |
| 32 | #include <linux/blkdev.h> |
| 33 | #include <linux/crypto.h> |
| 34 | #include <linux/delay.h> |
| 35 | #include <linux/kfifo.h> |
| 36 | #include <linux/scatterlist.h> |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 37 | #include <linux/mutex.h> |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 38 | #include <net/tcp.h> |
| 39 | #include <scsi/scsi_cmnd.h> |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 40 | #include <scsi/scsi_host.h> |
| 41 | #include <scsi/scsi.h> |
| 42 | #include <scsi/scsi_transport_iscsi.h> |
| 43 | |
| 44 | #include "iscsi_tcp.h" |
| 45 | |
Mike Christie | f70e9c5 | 2006-05-30 01:04:51 -0500 | [diff] [blame] | 46 | #define ISCSI_TCP_VERSION "1.0-595" |
Mike Christie | e0ecae8 | 2006-05-18 20:31:43 -0500 | [diff] [blame] | 47 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 48 | MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, " |
| 49 | "Alex Aizman <itn780@yahoo.com>"); |
| 50 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); |
| 51 | MODULE_LICENSE("GPL"); |
Mike Christie | e0ecae8 | 2006-05-18 20:31:43 -0500 | [diff] [blame] | 52 | MODULE_VERSION(ISCSI_TCP_VERSION); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 53 | /* #define DEBUG_TCP */ |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 54 | #define DEBUG_ASSERT |
| 55 | |
| 56 | #ifdef DEBUG_TCP |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 57 | #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 58 | #else |
| 59 | #define debug_tcp(fmt...) |
| 60 | #endif |
| 61 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 62 | #ifndef DEBUG_ASSERT |
| 63 | #ifdef BUG_ON |
| 64 | #undef BUG_ON |
| 65 | #endif |
| 66 | #define BUG_ON(expr) |
| 67 | #endif |
| 68 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 69 | static unsigned int iscsi_max_lun = 512; |
| 70 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); |
| 71 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 72 | static inline void |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 73 | iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size) |
| 74 | { |
Mike Christie | 7cae515 | 2006-01-13 18:05:47 -0600 | [diff] [blame] | 75 | ibuf->sg.page = virt_to_page(vbuf); |
| 76 | ibuf->sg.offset = offset_in_page(vbuf); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 77 | ibuf->sg.length = size; |
| 78 | ibuf->sent = 0; |
Mike Christie | 7cae515 | 2006-01-13 18:05:47 -0600 | [diff] [blame] | 79 | ibuf->use_sendmsg = 1; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | static inline void |
| 83 | iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg) |
| 84 | { |
Mike Christie | 7cae515 | 2006-01-13 18:05:47 -0600 | [diff] [blame] | 85 | ibuf->sg.page = sg->page; |
| 86 | ibuf->sg.offset = sg->offset; |
| 87 | ibuf->sg.length = sg->length; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 88 | /* |
| 89 | * Fastpath: sg element fits into single page |
| 90 | */ |
Mike Christie | a1e80c2 | 2006-01-13 18:05:56 -0600 | [diff] [blame] | 91 | if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page)) |
Mike Christie | 7cae515 | 2006-01-13 18:05:47 -0600 | [diff] [blame] | 92 | ibuf->use_sendmsg = 0; |
| 93 | else |
| 94 | ibuf->use_sendmsg = 1; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 95 | ibuf->sent = 0; |
| 96 | } |
| 97 | |
| 98 | static inline int |
| 99 | iscsi_buf_left(struct iscsi_buf *ibuf) |
| 100 | { |
| 101 | int rc; |
| 102 | |
| 103 | rc = ibuf->sg.length - ibuf->sent; |
| 104 | BUG_ON(rc < 0); |
| 105 | return rc; |
| 106 | } |
| 107 | |
| 108 | static inline void |
Mike Christie | af97348 | 2005-09-12 21:01:32 -0500 | [diff] [blame] | 109 | iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, |
| 110 | u8* crc) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 111 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 112 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 113 | |
| 114 | crypto_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc); |
Mike Christie | af97348 | 2005-09-12 21:01:32 -0500 | [diff] [blame] | 115 | buf->sg.length += sizeof(uint32_t); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 116 | } |
| 117 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 118 | static inline int |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 119 | iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 120 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 121 | struct sk_buff *skb = tcp_conn->in.skb; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 122 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 123 | tcp_conn->in.zero_copy_hdr = 0; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 124 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 125 | if (tcp_conn->in.copy >= tcp_conn->hdr_size && |
| 126 | tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 127 | /* |
| 128 | * Zero-copy PDU Header: using connection context |
| 129 | * to store header pointer. |
| 130 | */ |
| 131 | if (skb_shinfo(skb)->frag_list == NULL && |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 132 | !skb_shinfo(skb)->nr_frags) { |
| 133 | tcp_conn->in.hdr = (struct iscsi_hdr *) |
| 134 | ((char*)skb->data + tcp_conn->in.offset); |
| 135 | tcp_conn->in.zero_copy_hdr = 1; |
| 136 | } else { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 137 | /* ignoring return code since we checked |
| 138 | * in.copy before */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 139 | skb_copy_bits(skb, tcp_conn->in.offset, |
| 140 | &tcp_conn->hdr, tcp_conn->hdr_size); |
| 141 | tcp_conn->in.hdr = &tcp_conn->hdr; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 142 | } |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 143 | tcp_conn->in.offset += tcp_conn->hdr_size; |
| 144 | tcp_conn->in.copy -= tcp_conn->hdr_size; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 145 | } else { |
| 146 | int hdr_remains; |
| 147 | int copylen; |
| 148 | |
| 149 | /* |
| 150 | * PDU header scattered across SKB's, |
| 151 | * copying it... This'll happen quite rarely. |
| 152 | */ |
| 153 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 154 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) |
| 155 | tcp_conn->in.hdr_offset = 0; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 156 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 157 | hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 158 | BUG_ON(hdr_remains <= 0); |
| 159 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 160 | copylen = min(tcp_conn->in.copy, hdr_remains); |
| 161 | skb_copy_bits(skb, tcp_conn->in.offset, |
| 162 | (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset, |
| 163 | copylen); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 164 | |
| 165 | debug_tcp("PDU gather offset %d bytes %d in.offset %d " |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 166 | "in.copy %d\n", tcp_conn->in.hdr_offset, copylen, |
| 167 | tcp_conn->in.offset, tcp_conn->in.copy); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 168 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 169 | tcp_conn->in.offset += copylen; |
| 170 | tcp_conn->in.copy -= copylen; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 171 | if (copylen < hdr_remains) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 172 | tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER; |
| 173 | tcp_conn->in.hdr_offset += copylen; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 174 | return -EAGAIN; |
| 175 | } |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 176 | tcp_conn->in.hdr = &tcp_conn->hdr; |
| 177 | tcp_conn->discontiguous_hdr_cnt++; |
| 178 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | return 0; |
| 182 | } |
| 183 | |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 184 | /* |
| 185 | * must be called with session lock |
| 186 | */ |
| 187 | static void |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 188 | iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 189 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 190 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 191 | struct iscsi_r2t_info *r2t; |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 192 | struct scsi_cmnd *sc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 193 | |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 194 | /* flush ctask's r2t queues */ |
| 195 | while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { |
| 196 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, |
| 197 | sizeof(void*)); |
| 198 | debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n"); |
| 199 | } |
| 200 | |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 201 | sc = ctask->sc; |
| 202 | if (unlikely(!sc)) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 203 | return; |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 204 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 205 | tcp_ctask->xmstate = XMSTATE_IDLE; |
| 206 | tcp_ctask->r2t = NULL; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | /** |
| 210 | * iscsi_data_rsp - SCSI Data-In Response processing |
| 211 | * @conn: iscsi connection |
| 212 | * @ctask: scsi command task |
| 213 | **/ |
| 214 | static int |
| 215 | iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| 216 | { |
| 217 | int rc; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 218 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 219 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| 220 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 221 | struct iscsi_session *session = conn->session; |
| 222 | int datasn = be32_to_cpu(rhdr->datasn); |
| 223 | |
| 224 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); |
| 225 | if (rc) |
| 226 | return rc; |
| 227 | /* |
| 228 | * setup Data-In byte counter (gets decremented..) |
| 229 | */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 230 | ctask->data_count = tcp_conn->in.datalen; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 231 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 232 | if (tcp_conn->in.datalen == 0) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 233 | return 0; |
| 234 | |
| 235 | if (ctask->datasn != datasn) |
| 236 | return ISCSI_ERR_DATASN; |
| 237 | |
| 238 | ctask->datasn++; |
| 239 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 240 | tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); |
| 241 | if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 242 | return ISCSI_ERR_DATA_OFFSET; |
| 243 | |
| 244 | if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { |
| 245 | struct scsi_cmnd *sc = ctask->sc; |
| 246 | |
| 247 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
zhenyu.z.wang@intel.com | bf310b8 | 2006-01-13 18:05:38 -0600 | [diff] [blame] | 248 | if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 249 | int res_count = be32_to_cpu(rhdr->residual_count); |
| 250 | |
| 251 | if (res_count > 0 && |
| 252 | res_count <= sc->request_bufflen) { |
| 253 | sc->resid = res_count; |
| 254 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
| 255 | } else |
| 256 | sc->result = (DID_BAD_TARGET << 16) | |
| 257 | rhdr->cmd_status; |
zhenyu.z.wang@intel.com | bf310b8 | 2006-01-13 18:05:38 -0600 | [diff] [blame] | 258 | } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 259 | sc->resid = be32_to_cpu(rhdr->residual_count); |
| 260 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
| 261 | } else |
| 262 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
| 263 | } |
| 264 | |
| 265 | conn->datain_pdus_cnt++; |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | /** |
| 270 | * iscsi_solicit_data_init - initialize first Data-Out |
| 271 | * @conn: iscsi connection |
| 272 | * @ctask: scsi command task |
| 273 | * @r2t: R2T info |
| 274 | * |
| 275 | * Notes: |
| 276 | * Initialize first Data-Out within this R2T sequence and finds |
| 277 | * proper data_offset within this SCSI command. |
| 278 | * |
| 279 | * This function is called with connection lock taken. |
| 280 | **/ |
| 281 | static void |
| 282 | iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
| 283 | struct iscsi_r2t_info *r2t) |
| 284 | { |
| 285 | struct iscsi_data *hdr; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 286 | struct scsi_cmnd *sc = ctask->sc; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 287 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 288 | |
Mike Christie | ffbfe92 | 2006-05-18 20:31:36 -0500 | [diff] [blame] | 289 | hdr = &r2t->dtask.hdr; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 290 | memset(hdr, 0, sizeof(struct iscsi_data)); |
| 291 | hdr->ttt = r2t->ttt; |
| 292 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); |
| 293 | r2t->solicit_datasn++; |
| 294 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 295 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
| 296 | hdr->itt = ctask->hdr->itt; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 297 | hdr->exp_statsn = r2t->exp_statsn; |
| 298 | hdr->offset = cpu_to_be32(r2t->data_offset); |
| 299 | if (r2t->data_length > conn->max_xmit_dlength) { |
| 300 | hton24(hdr->dlength, conn->max_xmit_dlength); |
| 301 | r2t->data_count = conn->max_xmit_dlength; |
| 302 | hdr->flags = 0; |
| 303 | } else { |
| 304 | hton24(hdr->dlength, r2t->data_length); |
| 305 | r2t->data_count = r2t->data_length; |
| 306 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
| 307 | } |
| 308 | conn->dataout_pdus_cnt++; |
| 309 | |
| 310 | r2t->sent = 0; |
| 311 | |
Mike Christie | 6e458cc | 2006-05-18 20:31:31 -0500 | [diff] [blame] | 312 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
Mike Christie | af97348 | 2005-09-12 21:01:32 -0500 | [diff] [blame] | 313 | sizeof(struct iscsi_hdr)); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 314 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 315 | if (sc->use_sg) { |
| 316 | int i, sg_count = 0; |
| 317 | struct scatterlist *sg = sc->request_buffer; |
| 318 | |
| 319 | r2t->sg = NULL; |
| 320 | for (i = 0; i < sc->use_sg; i++, sg += 1) { |
| 321 | /* FIXME: prefetch ? */ |
| 322 | if (sg_count + sg->length > r2t->data_offset) { |
| 323 | int page_offset; |
| 324 | |
| 325 | /* sg page found! */ |
| 326 | |
| 327 | /* offset within this page */ |
| 328 | page_offset = r2t->data_offset - sg_count; |
| 329 | |
| 330 | /* fill in this buffer */ |
| 331 | iscsi_buf_init_sg(&r2t->sendbuf, sg); |
| 332 | r2t->sendbuf.sg.offset += page_offset; |
| 333 | r2t->sendbuf.sg.length -= page_offset; |
| 334 | |
| 335 | /* xmit logic will continue with next one */ |
| 336 | r2t->sg = sg + 1; |
| 337 | break; |
| 338 | } |
| 339 | sg_count += sg->length; |
| 340 | } |
| 341 | BUG_ON(r2t->sg == NULL); |
| 342 | } else |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 343 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 344 | (char*)sc->request_buffer + r2t->data_offset, |
| 345 | r2t->data_count); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 346 | } |
| 347 | |
| 348 | /** |
| 349 | * iscsi_r2t_rsp - iSCSI R2T Response processing |
| 350 | * @conn: iscsi connection |
| 351 | * @ctask: scsi command task |
| 352 | **/ |
| 353 | static int |
| 354 | iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| 355 | { |
| 356 | struct iscsi_r2t_info *r2t; |
| 357 | struct iscsi_session *session = conn->session; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 358 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| 359 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 360 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 361 | int r2tsn = be32_to_cpu(rhdr->r2tsn); |
| 362 | int rc; |
| 363 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 364 | if (tcp_conn->in.datalen) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 365 | return ISCSI_ERR_DATALEN; |
| 366 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 367 | if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 368 | return ISCSI_ERR_R2TSN; |
| 369 | |
| 370 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); |
| 371 | if (rc) |
| 372 | return rc; |
| 373 | |
| 374 | /* FIXME: use R2TSN to detect missing R2T */ |
| 375 | |
| 376 | /* fill-in new R2T associated with the task */ |
| 377 | spin_lock(&session->lock); |
| 378 | if (!ctask->sc || ctask->mtask || |
| 379 | session->state != ISCSI_STATE_LOGGED_IN) { |
| 380 | printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " |
| 381 | "recovery...\n", ctask->itt); |
| 382 | spin_unlock(&session->lock); |
| 383 | return 0; |
| 384 | } |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 385 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 386 | rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 387 | BUG_ON(!rc); |
| 388 | |
| 389 | r2t->exp_statsn = rhdr->statsn; |
| 390 | r2t->data_length = be32_to_cpu(rhdr->data_length); |
| 391 | if (r2t->data_length == 0 || |
| 392 | r2t->data_length > session->max_burst) { |
| 393 | spin_unlock(&session->lock); |
| 394 | return ISCSI_ERR_DATALEN; |
| 395 | } |
| 396 | |
| 397 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); |
| 398 | if (r2t->data_offset + r2t->data_length > ctask->total_length) { |
| 399 | spin_unlock(&session->lock); |
| 400 | return ISCSI_ERR_DATALEN; |
| 401 | } |
| 402 | |
| 403 | r2t->ttt = rhdr->ttt; /* no flip */ |
| 404 | r2t->solicit_datasn = 0; |
| 405 | |
| 406 | iscsi_solicit_data_init(conn, ctask, r2t); |
| 407 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 408 | tcp_ctask->exp_r2tsn = r2tsn + 1; |
| 409 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; |
| 410 | __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 411 | list_move_tail(&ctask->running, &conn->xmitqueue); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 412 | |
Mike Christie | 55e3299 | 2006-01-13 18:05:53 -0600 | [diff] [blame] | 413 | scsi_queue_work(session->host, &conn->xmitwork); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 414 | conn->r2t_pdus_cnt++; |
| 415 | spin_unlock(&session->lock); |
| 416 | |
| 417 | return 0; |
| 418 | } |
| 419 | |
| 420 | static int |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 421 | iscsi_tcp_hdr_recv(struct iscsi_conn *conn) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 422 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 423 | int rc = 0, opcode, ahslen; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 424 | struct iscsi_hdr *hdr; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 425 | struct iscsi_session *session = conn->session; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 426 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 427 | uint32_t cdgst, rdgst = 0, itt; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 428 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 429 | hdr = tcp_conn->in.hdr; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 430 | |
| 431 | /* verify PDU length */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 432 | tcp_conn->in.datalen = ntoh24(hdr->dlength); |
| 433 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 434 | printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 435 | tcp_conn->in.datalen, conn->max_recv_dlength); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 436 | return ISCSI_ERR_DATALEN; |
| 437 | } |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 438 | tcp_conn->data_copied = 0; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 439 | |
| 440 | /* read AHS */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 441 | ahslen = hdr->hlength << 2; |
| 442 | tcp_conn->in.offset += ahslen; |
| 443 | tcp_conn->in.copy -= ahslen; |
| 444 | if (tcp_conn->in.copy < 0) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 445 | printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 446 | "%d bytes\n", ahslen); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 447 | return ISCSI_ERR_AHSLEN; |
| 448 | } |
| 449 | |
| 450 | /* calculate read padding */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 451 | tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1); |
| 452 | if (tcp_conn->in.padding) { |
| 453 | tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding; |
| 454 | debug_scsi("read padding %d bytes\n", tcp_conn->in.padding); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | if (conn->hdrdgst_en) { |
| 458 | struct scatterlist sg; |
| 459 | |
| 460 | sg_init_one(&sg, (u8 *)hdr, |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 461 | sizeof(struct iscsi_hdr) + ahslen); |
| 462 | crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 463 | rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 464 | ahslen); |
Mike Christie | 8a47cd3 | 2005-11-30 02:27:19 -0600 | [diff] [blame] | 465 | if (cdgst != rdgst) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 466 | printk(KERN_ERR "iscsi_tcp: hdrdgst error " |
| 467 | "recv 0x%x calc 0x%x\n", rdgst, cdgst); |
Mike Christie | 8a47cd3 | 2005-11-30 02:27:19 -0600 | [diff] [blame] | 468 | return ISCSI_ERR_HDR_DGST; |
| 469 | } |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 470 | } |
| 471 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 472 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 473 | /* verify itt (itt encoding: age+cid+itt) */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 474 | rc = iscsi_verify_itt(conn, hdr, &itt); |
| 475 | if (rc == ISCSI_ERR_NO_SCSI_CMD) { |
| 476 | tcp_conn->in.datalen = 0; /* force drop */ |
| 477 | return 0; |
| 478 | } else if (rc) |
| 479 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 480 | |
| 481 | debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 482 | opcode, tcp_conn->in.offset, tcp_conn->in.copy, |
| 483 | ahslen, tcp_conn->in.datalen); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 484 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 485 | switch(opcode) { |
| 486 | case ISCSI_OP_SCSI_DATA_IN: |
| 487 | tcp_conn->in.ctask = session->cmds[itt]; |
| 488 | rc = iscsi_data_rsp(conn, tcp_conn->in.ctask); |
| 489 | /* fall through */ |
| 490 | case ISCSI_OP_SCSI_CMD_RSP: |
| 491 | tcp_conn->in.ctask = session->cmds[itt]; |
| 492 | if (tcp_conn->in.datalen) |
| 493 | goto copy_hdr; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 494 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 495 | spin_lock(&session->lock); |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 496 | iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 497 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); |
| 498 | spin_unlock(&session->lock); |
| 499 | break; |
| 500 | case ISCSI_OP_R2T: |
| 501 | tcp_conn->in.ctask = session->cmds[itt]; |
| 502 | if (ahslen) |
| 503 | rc = ISCSI_ERR_AHSLEN; |
| 504 | else if (tcp_conn->in.ctask->sc->sc_data_direction == |
| 505 | DMA_TO_DEVICE) |
| 506 | rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); |
| 507 | else |
| 508 | rc = ISCSI_ERR_PROTO; |
| 509 | break; |
| 510 | case ISCSI_OP_LOGIN_RSP: |
| 511 | case ISCSI_OP_TEXT_RSP: |
| 512 | case ISCSI_OP_LOGOUT_RSP: |
| 513 | case ISCSI_OP_NOOP_IN: |
| 514 | case ISCSI_OP_REJECT: |
| 515 | case ISCSI_OP_ASYNC_EVENT: |
| 516 | if (tcp_conn->in.datalen) |
| 517 | goto copy_hdr; |
| 518 | /* fall through */ |
| 519 | case ISCSI_OP_SCSI_TMFUNC_RSP: |
| 520 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); |
| 521 | break; |
| 522 | default: |
| 523 | rc = ISCSI_ERR_BAD_OPCODE; |
| 524 | break; |
| 525 | } |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 526 | |
| 527 | return rc; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 528 | |
| 529 | copy_hdr: |
| 530 | /* |
| 531 | * if we did zero copy for the header but we will need multiple |
| 532 | * skbs to complete the command then we have to copy the header |
| 533 | * for later use |
| 534 | */ |
| 535 | if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy < |
| 536 | (tcp_conn->in.datalen + tcp_conn->in.padding + |
| 537 | (conn->datadgst_en ? 4 : 0))) { |
| 538 | debug_tcp("Copying header for later use. in.copy %d in.datalen" |
| 539 | " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); |
| 540 | memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, |
| 541 | sizeof(struct iscsi_hdr)); |
| 542 | tcp_conn->in.hdr = &tcp_conn->hdr; |
| 543 | tcp_conn->in.zero_copy_hdr = 0; |
| 544 | } |
| 545 | return 0; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 546 | } |
| 547 | |
| 548 | /** |
| 549 | * iscsi_ctask_copy - copy skb bits to the destanation cmd task |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 550 | * @conn: iscsi tcp connection |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 551 | * @ctask: scsi command task |
| 552 | * @buf: buffer to copy to |
| 553 | * @buf_size: size of buffer |
| 554 | * @offset: offset within the buffer |
| 555 | * |
| 556 | * Notes: |
| 557 | * The function calls skb_copy_bits() and updates per-connection and |
| 558 | * per-cmd byte counters. |
| 559 | * |
| 560 | * Read counters (in bytes): |
| 561 | * |
| 562 | * conn->in.offset offset within in progress SKB |
| 563 | * conn->in.copy left to copy from in progress SKB |
| 564 | * including padding |
| 565 | * conn->in.copied copied already from in progress SKB |
| 566 | * conn->data_copied copied already from in progress buffer |
| 567 | * ctask->sent total bytes sent up to the MidLayer |
| 568 | * ctask->data_count left to copy from in progress Data-In |
| 569 | * buf_left left to copy from in progress buffer |
| 570 | **/ |
| 571 | static inline int |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 572 | iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 573 | void *buf, int buf_size, int offset) |
| 574 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 575 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| 576 | int buf_left = buf_size - (tcp_conn->data_copied + offset); |
| 577 | int size = min(tcp_conn->in.copy, buf_left); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 578 | int rc; |
| 579 | |
| 580 | size = min(size, ctask->data_count); |
| 581 | |
| 582 | debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 583 | size, tcp_conn->in.offset, tcp_conn->in.copied); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 584 | |
| 585 | BUG_ON(size <= 0); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 586 | BUG_ON(tcp_ctask->sent + size > ctask->total_length); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 587 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 588 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
| 589 | (char*)buf + (offset + tcp_conn->data_copied), size); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 590 | /* must fit into skb->len */ |
| 591 | BUG_ON(rc); |
| 592 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 593 | tcp_conn->in.offset += size; |
| 594 | tcp_conn->in.copy -= size; |
| 595 | tcp_conn->in.copied += size; |
| 596 | tcp_conn->data_copied += size; |
| 597 | tcp_ctask->sent += size; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 598 | ctask->data_count -= size; |
| 599 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 600 | BUG_ON(tcp_conn->in.copy < 0); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 601 | BUG_ON(ctask->data_count < 0); |
| 602 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 603 | if (buf_size != (tcp_conn->data_copied + offset)) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 604 | if (!ctask->data_count) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 605 | BUG_ON(buf_size - tcp_conn->data_copied < 0); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 606 | /* done with this PDU */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 607 | return buf_size - tcp_conn->data_copied; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 608 | } |
| 609 | return -EAGAIN; |
| 610 | } |
| 611 | |
| 612 | /* done with this buffer or with both - PDU and buffer */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 613 | tcp_conn->data_copied = 0; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 614 | return 0; |
| 615 | } |
| 616 | |
| 617 | /** |
| 618 | * iscsi_tcp_copy - copy skb bits to the destanation buffer |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 619 | * @conn: iscsi tcp connection |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 620 | * |
| 621 | * Notes: |
| 622 | * The function calls skb_copy_bits() and updates per-connection |
| 623 | * byte counters. |
| 624 | **/ |
| 625 | static inline int |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 626 | iscsi_tcp_copy(struct iscsi_tcp_conn *tcp_conn) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 627 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 628 | void *buf = tcp_conn->data; |
| 629 | int buf_size = tcp_conn->in.datalen; |
| 630 | int buf_left = buf_size - tcp_conn->data_copied; |
| 631 | int size = min(tcp_conn->in.copy, buf_left); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 632 | int rc; |
| 633 | |
| 634 | debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 635 | size, tcp_conn->in.offset, tcp_conn->data_copied); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 636 | BUG_ON(size <= 0); |
| 637 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 638 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
| 639 | (char*)buf + tcp_conn->data_copied, size); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 640 | BUG_ON(rc); |
| 641 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 642 | tcp_conn->in.offset += size; |
| 643 | tcp_conn->in.copy -= size; |
| 644 | tcp_conn->in.copied += size; |
| 645 | tcp_conn->data_copied += size; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 646 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 647 | if (buf_size != tcp_conn->data_copied) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 648 | return -EAGAIN; |
| 649 | |
| 650 | return 0; |
| 651 | } |
| 652 | |
| 653 | static inline void |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 654 | partial_sg_digest_update(struct iscsi_tcp_conn *tcp_conn, |
| 655 | struct scatterlist *sg, int offset, int length) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 656 | { |
| 657 | struct scatterlist temp; |
| 658 | |
| 659 | memcpy(&temp, sg, sizeof(struct scatterlist)); |
| 660 | temp.offset = offset; |
| 661 | temp.length = length; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 662 | crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 663 | } |
| 664 | |
Mike Christie | f6cfba1 | 2005-11-29 23:12:57 -0600 | [diff] [blame] | 665 | static void |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 666 | iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) |
Mike Christie | f6cfba1 | 2005-11-29 23:12:57 -0600 | [diff] [blame] | 667 | { |
| 668 | struct scatterlist tmp; |
| 669 | |
| 670 | sg_init_one(&tmp, buf, len); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 671 | crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1); |
Mike Christie | f6cfba1 | 2005-11-29 23:12:57 -0600 | [diff] [blame] | 672 | } |
| 673 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 674 | static int iscsi_scsi_data_in(struct iscsi_conn *conn) |
| 675 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 676 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 677 | struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; |
| 678 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 679 | struct scsi_cmnd *sc = ctask->sc; |
Mike Christie | f6cfba1 | 2005-11-29 23:12:57 -0600 | [diff] [blame] | 680 | struct scatterlist *sg; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 681 | int i, offset, rc = 0; |
| 682 | |
| 683 | BUG_ON((void*)ctask != sc->SCp.ptr); |
| 684 | |
| 685 | /* |
| 686 | * copying Data-In into the Scsi_Cmnd |
| 687 | */ |
| 688 | if (!sc->use_sg) { |
| 689 | i = ctask->data_count; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 690 | rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, |
| 691 | sc->request_bufflen, |
| 692 | tcp_ctask->data_offset); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 693 | if (rc == -EAGAIN) |
| 694 | return rc; |
FUJITA Tomonori | 42f72aa | 2006-01-13 18:05:35 -0600 | [diff] [blame] | 695 | if (conn->datadgst_en) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 696 | iscsi_recv_digest_update(tcp_conn, sc->request_buffer, |
| 697 | i); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 698 | rc = 0; |
| 699 | goto done; |
| 700 | } |
| 701 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 702 | offset = tcp_ctask->data_offset; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 703 | sg = sc->request_buffer; |
| 704 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 705 | if (tcp_ctask->data_offset) |
| 706 | for (i = 0; i < tcp_ctask->sg_count; i++) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 707 | offset -= sg[i].length; |
| 708 | /* we've passed through partial sg*/ |
| 709 | if (offset < 0) |
| 710 | offset = 0; |
| 711 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 712 | for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 713 | char *dest; |
| 714 | |
| 715 | dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 716 | rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 717 | sg[i].length, offset); |
| 718 | kunmap_atomic(dest, KM_SOFTIRQ0); |
| 719 | if (rc == -EAGAIN) |
| 720 | /* continue with the next SKB/PDU */ |
| 721 | return rc; |
| 722 | if (!rc) { |
| 723 | if (conn->datadgst_en) { |
| 724 | if (!offset) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 725 | crypto_digest_update( |
| 726 | tcp_conn->data_rx_tfm, |
| 727 | &sg[i], 1); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 728 | else |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 729 | partial_sg_digest_update(tcp_conn, |
| 730 | &sg[i], |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 731 | sg[i].offset + offset, |
| 732 | sg[i].length - offset); |
| 733 | } |
| 734 | offset = 0; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 735 | tcp_ctask->sg_count++; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 736 | } |
| 737 | |
| 738 | if (!ctask->data_count) { |
| 739 | if (rc && conn->datadgst_en) |
| 740 | /* |
| 741 | * data-in is complete, but buffer not... |
| 742 | */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 743 | partial_sg_digest_update(tcp_conn, &sg[i], |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 744 | sg[i].offset, sg[i].length-rc); |
| 745 | rc = 0; |
| 746 | break; |
| 747 | } |
| 748 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 749 | if (!tcp_conn->in.copy) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 750 | return -EAGAIN; |
| 751 | } |
| 752 | BUG_ON(ctask->data_count); |
| 753 | |
| 754 | done: |
| 755 | /* check for non-exceptional status */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 756 | if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 757 | debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n", |
| 758 | (long)sc, sc->result, ctask->itt, |
| 759 | tcp_conn->in.hdr->flags); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 760 | spin_lock(&conn->session->lock); |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 761 | iscsi_tcp_cleanup_ctask(conn, ctask); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 762 | __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); |
| 763 | spin_unlock(&conn->session->lock); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 764 | } |
| 765 | |
| 766 | return rc; |
| 767 | } |
| 768 | |
| 769 | static int |
| 770 | iscsi_data_recv(struct iscsi_conn *conn) |
| 771 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 772 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 773 | int rc = 0, opcode; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 774 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 775 | opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
| 776 | switch (opcode) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 777 | case ISCSI_OP_SCSI_DATA_IN: |
| 778 | rc = iscsi_scsi_data_in(conn); |
| 779 | break; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 780 | case ISCSI_OP_SCSI_CMD_RSP: |
| 781 | spin_lock(&conn->session->lock); |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 782 | iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 783 | spin_unlock(&conn->session->lock); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 784 | case ISCSI_OP_TEXT_RSP: |
| 785 | case ISCSI_OP_LOGIN_RSP: |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 786 | case ISCSI_OP_NOOP_IN: |
| 787 | case ISCSI_OP_ASYNC_EVENT: |
| 788 | case ISCSI_OP_REJECT: |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 789 | /* |
| 790 | * Collect data segment to the connection's data |
| 791 | * placeholder |
| 792 | */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 793 | if (iscsi_tcp_copy(tcp_conn)) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 794 | rc = -EAGAIN; |
| 795 | goto exit; |
| 796 | } |
| 797 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 798 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, tcp_conn->data, |
| 799 | tcp_conn->in.datalen); |
| 800 | if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) |
| 801 | iscsi_recv_digest_update(tcp_conn, tcp_conn->data, |
| 802 | tcp_conn->in.datalen); |
| 803 | break; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 804 | default: |
| 805 | BUG_ON(1); |
| 806 | } |
| 807 | exit: |
| 808 | return rc; |
| 809 | } |
| 810 | |
| 811 | /** |
| 812 | * iscsi_tcp_data_recv - TCP receive in sendfile fashion |
| 813 | * @rd_desc: read descriptor |
| 814 | * @skb: socket buffer |
| 815 | * @offset: offset in skb |
| 816 | * @len: skb->len - offset |
| 817 | **/ |
| 818 | static int |
| 819 | iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, |
| 820 | unsigned int offset, size_t len) |
| 821 | { |
| 822 | int rc; |
| 823 | struct iscsi_conn *conn = rd_desc->arg.data; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 824 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 825 | int processed; |
| 826 | char pad[ISCSI_PAD_LEN]; |
| 827 | struct scatterlist sg; |
| 828 | |
| 829 | /* |
| 830 | * Save current SKB and its offset in the corresponding |
| 831 | * connection context. |
| 832 | */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 833 | tcp_conn->in.copy = skb->len - offset; |
| 834 | tcp_conn->in.offset = offset; |
| 835 | tcp_conn->in.skb = skb; |
| 836 | tcp_conn->in.len = tcp_conn->in.copy; |
| 837 | BUG_ON(tcp_conn->in.copy <= 0); |
| 838 | debug_tcp("in %d bytes\n", tcp_conn->in.copy); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 839 | |
| 840 | more: |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 841 | tcp_conn->in.copied = 0; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 842 | rc = 0; |
| 843 | |
| 844 | if (unlikely(conn->suspend_rx)) { |
| 845 | debug_tcp("conn %d Rx suspended!\n", conn->id); |
| 846 | return 0; |
| 847 | } |
| 848 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 849 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || |
| 850 | tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { |
| 851 | rc = iscsi_hdr_extract(tcp_conn); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 852 | if (rc) { |
| 853 | if (rc == -EAGAIN) |
| 854 | goto nomore; |
| 855 | else { |
Mike Christie | d82967c | 2006-07-24 15:47:11 -0500 | [diff] [blame] | 856 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 857 | return 0; |
| 858 | } |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * Verify and process incoming PDU header. |
| 863 | */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 864 | rc = iscsi_tcp_hdr_recv(conn); |
| 865 | if (!rc && tcp_conn->in.datalen) { |
Mike Christie | 8a47cd3 | 2005-11-30 02:27:19 -0600 | [diff] [blame] | 866 | if (conn->datadgst_en) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 867 | BUG_ON(!tcp_conn->data_rx_tfm); |
| 868 | crypto_digest_init(tcp_conn->data_rx_tfm); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 869 | } |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 870 | tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 871 | } else if (rc) { |
Mike Christie | d82967c | 2006-07-24 15:47:11 -0500 | [diff] [blame] | 872 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 873 | return 0; |
| 874 | } |
| 875 | } |
| 876 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 877 | if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { |
Mike Christie | f6cfba1 | 2005-11-29 23:12:57 -0600 | [diff] [blame] | 878 | uint32_t recv_digest; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 879 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 880 | debug_tcp("extra data_recv offset %d copy %d\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 881 | tcp_conn->in.offset, tcp_conn->in.copy); |
| 882 | skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
Mike Christie | f6cfba1 | 2005-11-29 23:12:57 -0600 | [diff] [blame] | 883 | &recv_digest, 4); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 884 | tcp_conn->in.offset += 4; |
| 885 | tcp_conn->in.copy -= 4; |
| 886 | if (recv_digest != tcp_conn->in.datadgst) { |
Mike Christie | f6cfba1 | 2005-11-29 23:12:57 -0600 | [diff] [blame] | 887 | debug_tcp("iscsi_tcp: data digest error!" |
| 888 | "0x%x != 0x%x\n", recv_digest, |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 889 | tcp_conn->in.datadgst); |
Mike Christie | f6cfba1 | 2005-11-29 23:12:57 -0600 | [diff] [blame] | 890 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
| 891 | return 0; |
| 892 | } else { |
| 893 | debug_tcp("iscsi_tcp: data digest match!" |
| 894 | "0x%x == 0x%x\n", recv_digest, |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 895 | tcp_conn->in.datadgst); |
| 896 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 897 | } |
| 898 | } |
| 899 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 900 | if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && |
| 901 | tcp_conn->in.copy) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 902 | |
| 903 | debug_tcp("data_recv offset %d copy %d\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 904 | tcp_conn->in.offset, tcp_conn->in.copy); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 905 | |
| 906 | rc = iscsi_data_recv(conn); |
| 907 | if (rc) { |
Mike Christie | 665b44a | 2006-05-02 19:46:49 -0500 | [diff] [blame] | 908 | if (rc == -EAGAIN) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 909 | goto again; |
Mike Christie | d82967c | 2006-07-24 15:47:11 -0500 | [diff] [blame] | 910 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 911 | return 0; |
| 912 | } |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 913 | tcp_conn->in.copy -= tcp_conn->in.padding; |
| 914 | tcp_conn->in.offset += tcp_conn->in.padding; |
Mike Christie | 8a47cd3 | 2005-11-30 02:27:19 -0600 | [diff] [blame] | 915 | if (conn->datadgst_en) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 916 | if (tcp_conn->in.padding) { |
| 917 | debug_tcp("padding -> %d\n", |
| 918 | tcp_conn->in.padding); |
| 919 | memset(pad, 0, tcp_conn->in.padding); |
| 920 | sg_init_one(&sg, pad, tcp_conn->in.padding); |
| 921 | crypto_digest_update(tcp_conn->data_rx_tfm, |
| 922 | &sg, 1); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 923 | } |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 924 | crypto_digest_final(tcp_conn->data_rx_tfm, |
| 925 | (u8 *) & tcp_conn->in.datadgst); |
| 926 | debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); |
| 927 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 928 | } else |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 929 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 930 | } |
| 931 | |
| 932 | debug_tcp("f, processed %d from out of %d padding %d\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 933 | tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); |
| 934 | BUG_ON(tcp_conn->in.offset - offset > len); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 935 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 936 | if (tcp_conn->in.offset - offset != len) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 937 | debug_tcp("continue to process %d bytes\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 938 | (int)len - (tcp_conn->in.offset - offset)); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 939 | goto more; |
| 940 | } |
| 941 | |
| 942 | nomore: |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 943 | processed = tcp_conn->in.offset - offset; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 944 | BUG_ON(processed == 0); |
| 945 | return processed; |
| 946 | |
| 947 | again: |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 948 | processed = tcp_conn->in.offset - offset; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 949 | debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", |
| 950 | processed, (int)len, (int)rd_desc->count); |
| 951 | BUG_ON(processed == 0); |
| 952 | BUG_ON(processed > len); |
| 953 | |
| 954 | conn->rxdata_octets += processed; |
| 955 | return processed; |
| 956 | } |
| 957 | |
| 958 | static void |
| 959 | iscsi_tcp_data_ready(struct sock *sk, int flag) |
| 960 | { |
| 961 | struct iscsi_conn *conn = sk->sk_user_data; |
| 962 | read_descriptor_t rd_desc; |
| 963 | |
| 964 | read_lock(&sk->sk_callback_lock); |
| 965 | |
Mike Christie | 665b44a | 2006-05-02 19:46:49 -0500 | [diff] [blame] | 966 | /* |
| 967 | * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv. |
| 968 | * We set count to 1 because we want the network layer to |
| 969 | * hand us all the skbs that are available. iscsi_tcp_data_recv |
| 970 | * handled pdus that cross buffers or pdus that still need data. |
| 971 | */ |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 972 | rd_desc.arg.data = conn; |
Mike Christie | 665b44a | 2006-05-02 19:46:49 -0500 | [diff] [blame] | 973 | rd_desc.count = 1; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 974 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); |
| 975 | |
| 976 | read_unlock(&sk->sk_callback_lock); |
| 977 | } |
| 978 | |
| 979 | static void |
| 980 | iscsi_tcp_state_change(struct sock *sk) |
| 981 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 982 | struct iscsi_tcp_conn *tcp_conn; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 983 | struct iscsi_conn *conn; |
| 984 | struct iscsi_session *session; |
| 985 | void (*old_state_change)(struct sock *); |
| 986 | |
| 987 | read_lock(&sk->sk_callback_lock); |
| 988 | |
| 989 | conn = (struct iscsi_conn*)sk->sk_user_data; |
| 990 | session = conn->session; |
| 991 | |
Mike Christie | e627399 | 2005-11-29 23:12:49 -0600 | [diff] [blame] | 992 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
| 993 | sk->sk_state == TCP_CLOSE) && |
| 994 | !atomic_read(&sk->sk_rmem_alloc)) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 995 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
| 996 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| 997 | } |
| 998 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 999 | tcp_conn = conn->dd_data; |
| 1000 | old_state_change = tcp_conn->old_state_change; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1001 | |
| 1002 | read_unlock(&sk->sk_callback_lock); |
| 1003 | |
| 1004 | old_state_change(sk); |
| 1005 | } |
| 1006 | |
| 1007 | /** |
| 1008 | * iscsi_write_space - Called when more output buffer space is available |
| 1009 | * @sk: socket space is available for |
| 1010 | **/ |
| 1011 | static void |
| 1012 | iscsi_write_space(struct sock *sk) |
| 1013 | { |
| 1014 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1015 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 1016 | |
| 1017 | tcp_conn->old_write_space(sk); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1018 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
Mike Christie | 55e3299 | 2006-01-13 18:05:53 -0600 | [diff] [blame] | 1019 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1020 | } |
| 1021 | |
| 1022 | static void |
| 1023 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) |
| 1024 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1025 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 1026 | struct sock *sk = tcp_conn->sock->sk; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1027 | |
| 1028 | /* assign new callbacks */ |
| 1029 | write_lock_bh(&sk->sk_callback_lock); |
| 1030 | sk->sk_user_data = conn; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1031 | tcp_conn->old_data_ready = sk->sk_data_ready; |
| 1032 | tcp_conn->old_state_change = sk->sk_state_change; |
| 1033 | tcp_conn->old_write_space = sk->sk_write_space; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1034 | sk->sk_data_ready = iscsi_tcp_data_ready; |
| 1035 | sk->sk_state_change = iscsi_tcp_state_change; |
| 1036 | sk->sk_write_space = iscsi_write_space; |
| 1037 | write_unlock_bh(&sk->sk_callback_lock); |
| 1038 | } |
| 1039 | |
| 1040 | static void |
| 1041 | iscsi_conn_restore_callbacks(struct iscsi_conn *conn) |
| 1042 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1043 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 1044 | struct sock *sk = tcp_conn->sock->sk; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1045 | |
| 1046 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ |
| 1047 | write_lock_bh(&sk->sk_callback_lock); |
| 1048 | sk->sk_user_data = NULL; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1049 | sk->sk_data_ready = tcp_conn->old_data_ready; |
| 1050 | sk->sk_state_change = tcp_conn->old_state_change; |
| 1051 | sk->sk_write_space = tcp_conn->old_write_space; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1052 | sk->sk_no_check = 0; |
| 1053 | write_unlock_bh(&sk->sk_callback_lock); |
| 1054 | } |
| 1055 | |
| 1056 | /** |
| 1057 | * iscsi_send - generic send routine |
| 1058 | * @sk: kernel's socket |
| 1059 | * @buf: buffer to write from |
| 1060 | * @size: actual size to write |
| 1061 | * @flags: socket's flags |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1062 | */ |
| 1063 | static inline int |
FUJITA Tomonori | 5685169 | 2006-01-13 18:05:44 -0600 | [diff] [blame] | 1064 | iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1065 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1066 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 1067 | struct socket *sk = tcp_conn->sock; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1068 | int offset = buf->sg.offset + buf->sent, res; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1069 | |
Mike Christie | 7cae515 | 2006-01-13 18:05:47 -0600 | [diff] [blame] | 1070 | /* |
| 1071 | * if we got use_sg=0 or are sending something we kmallocd |
| 1072 | * then we did not have to do kmap (kmap returns page_address) |
| 1073 | * |
| 1074 | * if we got use_sg > 0, but had to drop down, we do not |
| 1075 | * set clustering so this should only happen for that |
| 1076 | * slab case. |
| 1077 | */ |
| 1078 | if (buf->use_sendmsg) |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1079 | res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags); |
Mike Christie | 7cae515 | 2006-01-13 18:05:47 -0600 | [diff] [blame] | 1080 | else |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1081 | res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags); |
| 1082 | |
| 1083 | if (res >= 0) { |
| 1084 | conn->txdata_octets += res; |
| 1085 | buf->sent += res; |
| 1086 | return res; |
| 1087 | } |
| 1088 | |
| 1089 | tcp_conn->sendpage_failures_cnt++; |
| 1090 | if (res == -EAGAIN) |
| 1091 | res = -ENOBUFS; |
| 1092 | else |
| 1093 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| 1094 | return res; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1095 | } |
| 1096 | |
| 1097 | /** |
| 1098 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() |
| 1099 | * @conn: iscsi connection |
| 1100 | * @buf: buffer to write from |
| 1101 | * @datalen: lenght of data to be sent after the header |
| 1102 | * |
| 1103 | * Notes: |
| 1104 | * (Tx, Fast Path) |
| 1105 | **/ |
| 1106 | static inline int |
| 1107 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) |
| 1108 | { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1109 | int flags = 0; /* MSG_DONTWAIT; */ |
| 1110 | int res, size; |
| 1111 | |
| 1112 | size = buf->sg.length - buf->sent; |
| 1113 | BUG_ON(buf->sent + size > buf->sg.length); |
| 1114 | if (buf->sent + size != buf->sg.length || datalen) |
| 1115 | flags |= MSG_MORE; |
| 1116 | |
FUJITA Tomonori | 5685169 | 2006-01-13 18:05:44 -0600 | [diff] [blame] | 1117 | res = iscsi_send(conn, buf, size, flags); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1118 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
| 1119 | if (res >= 0) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1120 | if (size != res) |
| 1121 | return -EAGAIN; |
| 1122 | return 0; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1123 | } |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1124 | |
| 1125 | return res; |
| 1126 | } |
| 1127 | |
| 1128 | /** |
| 1129 | * iscsi_sendpage - send one page of iSCSI Data-Out. |
| 1130 | * @conn: iscsi connection |
| 1131 | * @buf: buffer to write from |
| 1132 | * @count: remaining data |
| 1133 | * @sent: number of bytes sent |
| 1134 | * |
| 1135 | * Notes: |
| 1136 | * (Tx, Fast Path) |
| 1137 | **/ |
| 1138 | static inline int |
| 1139 | iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, |
| 1140 | int *count, int *sent) |
| 1141 | { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1142 | int flags = 0; /* MSG_DONTWAIT; */ |
| 1143 | int res, size; |
| 1144 | |
| 1145 | size = buf->sg.length - buf->sent; |
| 1146 | BUG_ON(buf->sent + size > buf->sg.length); |
| 1147 | if (size > *count) |
| 1148 | size = *count; |
Mike Christie | b13941f | 2005-09-12 21:01:28 -0500 | [diff] [blame] | 1149 | if (buf->sent + size != buf->sg.length || *count != size) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1150 | flags |= MSG_MORE; |
| 1151 | |
FUJITA Tomonori | 5685169 | 2006-01-13 18:05:44 -0600 | [diff] [blame] | 1152 | res = iscsi_send(conn, buf, size, flags); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1153 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
| 1154 | size, buf->sent, *count, *sent, res); |
| 1155 | if (res >= 0) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1156 | *count -= res; |
| 1157 | *sent += res; |
| 1158 | if (size != res) |
| 1159 | return -EAGAIN; |
| 1160 | return 0; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1161 | } |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1162 | |
| 1163 | return res; |
| 1164 | } |
| 1165 | |
| 1166 | static inline void |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1167 | iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
| 1168 | struct iscsi_cmd_task *ctask) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1169 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1170 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| 1171 | |
| 1172 | BUG_ON(!tcp_conn->data_tx_tfm); |
| 1173 | crypto_digest_init(tcp_conn->data_tx_tfm); |
| 1174 | tcp_ctask->digest_count = 4; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1175 | } |
| 1176 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 1177 | static int |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1178 | iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
| 1179 | struct iscsi_buf *buf, uint32_t *digest, int final) |
| 1180 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1181 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| 1182 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1183 | int rc = 0; |
| 1184 | int sent = 0; |
| 1185 | |
| 1186 | if (final) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1187 | crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1188 | |
Mike Christie | 6e458cc | 2006-05-18 20:31:31 -0500 | [diff] [blame] | 1189 | iscsi_buf_init_iov(buf, (char*)digest, 4); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1190 | rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1191 | if (rc) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1192 | tcp_ctask->datadigest = *digest; |
| 1193 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1194 | } else |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1195 | tcp_ctask->digest_count = 4; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1196 | return rc; |
| 1197 | } |
| 1198 | |
| 1199 | /** |
| 1200 | * iscsi_solicit_data_cont - initialize next Data-Out |
| 1201 | * @conn: iscsi connection |
| 1202 | * @ctask: scsi command task |
| 1203 | * @r2t: R2T info |
| 1204 | * @left: bytes left to transfer |
| 1205 | * |
| 1206 | * Notes: |
| 1207 | * Initialize next Data-Out within this R2T sequence and continue |
| 1208 | * to process next Scatter-Gather element(if any) of this SCSI command. |
| 1209 | * |
| 1210 | * Called under connection lock. |
| 1211 | **/ |
| 1212 | static void |
| 1213 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
| 1214 | struct iscsi_r2t_info *r2t, int left) |
| 1215 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1216 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1217 | struct iscsi_data *hdr; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1218 | struct scsi_cmnd *sc = ctask->sc; |
| 1219 | int new_offset; |
| 1220 | |
Mike Christie | ffbfe92 | 2006-05-18 20:31:36 -0500 | [diff] [blame] | 1221 | hdr = &r2t->dtask.hdr; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1222 | memset(hdr, 0, sizeof(struct iscsi_data)); |
| 1223 | hdr->ttt = r2t->ttt; |
| 1224 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); |
| 1225 | r2t->solicit_datasn++; |
| 1226 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1227 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
| 1228 | hdr->itt = ctask->hdr->itt; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1229 | hdr->exp_statsn = r2t->exp_statsn; |
| 1230 | new_offset = r2t->data_offset + r2t->sent; |
| 1231 | hdr->offset = cpu_to_be32(new_offset); |
| 1232 | if (left > conn->max_xmit_dlength) { |
| 1233 | hton24(hdr->dlength, conn->max_xmit_dlength); |
| 1234 | r2t->data_count = conn->max_xmit_dlength; |
| 1235 | } else { |
| 1236 | hton24(hdr->dlength, left); |
| 1237 | r2t->data_count = left; |
| 1238 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
| 1239 | } |
| 1240 | conn->dataout_pdus_cnt++; |
| 1241 | |
Mike Christie | 6e458cc | 2006-05-18 20:31:31 -0500 | [diff] [blame] | 1242 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
Mike Christie | af97348 | 2005-09-12 21:01:32 -0500 | [diff] [blame] | 1243 | sizeof(struct iscsi_hdr)); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1244 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1245 | if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1246 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1247 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
| 1248 | r2t->sg += 1; |
| 1249 | } else |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1250 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1251 | (char*)sc->request_buffer + new_offset, |
| 1252 | r2t->data_count); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1253 | } |
| 1254 | |
| 1255 | static void |
| 1256 | iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| 1257 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1258 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1259 | struct iscsi_data_task *dtask; |
| 1260 | |
Mike Christie | ffbfe92 | 2006-05-18 20:31:36 -0500 | [diff] [blame] | 1261 | dtask = tcp_ctask->dtask = &tcp_ctask->unsol_dtask; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1262 | iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr, |
| 1263 | tcp_ctask->r2t_data_count); |
Mike Christie | 6e458cc | 2006-05-18 20:31:31 -0500 | [diff] [blame] | 1264 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, |
Mike Christie | af97348 | 2005-09-12 21:01:32 -0500 | [diff] [blame] | 1265 | sizeof(struct iscsi_hdr)); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1266 | } |
| 1267 | |
| 1268 | /** |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1269 | * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1270 | * @conn: iscsi connection |
| 1271 | * @ctask: scsi command task |
| 1272 | * @sc: scsi command |
| 1273 | **/ |
| 1274 | static void |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1275 | iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1276 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1277 | struct scsi_cmnd *sc = ctask->sc; |
| 1278 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1279 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1280 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1281 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1282 | tcp_ctask->sent = 0; |
| 1283 | tcp_ctask->sg_count = 0; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1284 | |
| 1285 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1286 | tcp_ctask->xmstate = XMSTATE_W_HDR; |
| 1287 | tcp_ctask->exp_r2tsn = 0; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1288 | BUG_ON(ctask->total_length == 0); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1289 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1290 | if (sc->use_sg) { |
| 1291 | struct scatterlist *sg = sc->request_buffer; |
| 1292 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1293 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
| 1294 | &sg[tcp_ctask->sg_count++]); |
| 1295 | tcp_ctask->sg = sg; |
| 1296 | tcp_ctask->bad_sg = sg + sc->use_sg; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1297 | } else |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1298 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
| 1299 | sc->request_buffer, |
| 1300 | sc->request_bufflen); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1301 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1302 | if (ctask->imm_count) |
| 1303 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1304 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1305 | tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); |
| 1306 | if (tcp_ctask->pad_count) { |
| 1307 | tcp_ctask->pad_count = ISCSI_PAD_LEN - |
| 1308 | tcp_ctask->pad_count; |
| 1309 | debug_scsi("write padding %d bytes\n", |
| 1310 | tcp_ctask->pad_count); |
| 1311 | tcp_ctask->xmstate |= XMSTATE_W_PAD; |
| 1312 | } |
| 1313 | |
| 1314 | if (ctask->unsol_count) |
| 1315 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR | |
| 1316 | XMSTATE_UNS_INIT; |
| 1317 | tcp_ctask->r2t_data_count = ctask->total_length - |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1318 | ctask->imm_count - |
| 1319 | ctask->unsol_count; |
| 1320 | |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 1321 | debug_scsi("cmd [itt 0x%x total %d imm %d imm_data %d " |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1322 | "r2t_data %d]\n", |
| 1323 | ctask->itt, ctask->total_length, ctask->imm_count, |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1324 | ctask->unsol_count, tcp_ctask->r2t_data_count); |
| 1325 | } else |
| 1326 | tcp_ctask->xmstate = XMSTATE_R_HDR; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1327 | |
Mike Christie | 6e458cc | 2006-05-18 20:31:31 -0500 | [diff] [blame] | 1328 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, |
Mike Christie | af97348 | 2005-09-12 21:01:32 -0500 | [diff] [blame] | 1329 | sizeof(struct iscsi_hdr)); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1330 | } |
| 1331 | |
| 1332 | /** |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1333 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1334 | * @conn: iscsi connection |
| 1335 | * @mtask: task management task |
| 1336 | * |
| 1337 | * Notes: |
| 1338 | * The function can return -EAGAIN in which case caller must |
| 1339 | * call it again later, or recover. '0' return code means successful |
| 1340 | * xmit. |
| 1341 | * |
| 1342 | * Management xmit state machine consists of two states: |
| 1343 | * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress |
| 1344 | * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress |
| 1345 | **/ |
| 1346 | static int |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1347 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1348 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1349 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1350 | int rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1351 | |
| 1352 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1353 | conn->id, tcp_mtask->xmstate, mtask->itt); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1354 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1355 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { |
| 1356 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1357 | if (mtask->data_count) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1358 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
Mike Christie | af97348 | 2005-09-12 21:01:32 -0500 | [diff] [blame] | 1359 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 1360 | conn->stop_stage != STOP_CONN_RECOVER && |
Mike Christie | af97348 | 2005-09-12 21:01:32 -0500 | [diff] [blame] | 1361 | conn->hdrdgst_en) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1362 | iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
| 1363 | (u8*)tcp_mtask->hdrext); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1364 | rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf, |
| 1365 | mtask->data_count); |
| 1366 | if (rc) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1367 | tcp_mtask->xmstate |= XMSTATE_IMM_HDR; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1368 | if (mtask->data_count) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1369 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1370 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1371 | } |
| 1372 | } |
| 1373 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1374 | if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1375 | BUG_ON(!mtask->data_count); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1376 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1377 | /* FIXME: implement. |
| 1378 | * Virtual buffer could be spreaded across multiple pages... |
| 1379 | */ |
| 1380 | do { |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1381 | int rc; |
| 1382 | |
| 1383 | rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf, |
| 1384 | &mtask->data_count, &tcp_mtask->sent); |
| 1385 | if (rc) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1386 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1387 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1388 | } |
| 1389 | } while (mtask->data_count); |
| 1390 | } |
| 1391 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1392 | BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
| 1393 | if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { |
| 1394 | struct iscsi_session *session = conn->session; |
| 1395 | |
| 1396 | spin_lock_bh(&session->lock); |
| 1397 | list_del(&conn->mtask->running); |
| 1398 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, |
| 1399 | sizeof(void*)); |
| 1400 | spin_unlock_bh(&session->lock); |
| 1401 | } |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1402 | return 0; |
| 1403 | } |
| 1404 | |
| 1405 | static inline int |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1406 | handle_xmstate_r_hdr(struct iscsi_conn *conn, |
| 1407 | struct iscsi_tcp_cmd_task *tcp_ctask) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1408 | { |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1409 | int rc; |
| 1410 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1411 | tcp_ctask->xmstate &= ~XMSTATE_R_HDR; |
FUJITA Tomonori | 42f72aa | 2006-01-13 18:05:35 -0600 | [diff] [blame] | 1412 | if (conn->hdrdgst_en) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1413 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
| 1414 | (u8*)tcp_ctask->hdrext); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1415 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0); |
| 1416 | if (!rc) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1417 | BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1418 | return 0; /* wait for Data-In */ |
| 1419 | } |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1420 | tcp_ctask->xmstate |= XMSTATE_R_HDR; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1421 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1422 | } |
| 1423 | |
| 1424 | static inline int |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1425 | handle_xmstate_w_hdr(struct iscsi_conn *conn, |
| 1426 | struct iscsi_cmd_task *ctask) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1427 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1428 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1429 | int rc; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1430 | |
| 1431 | tcp_ctask->xmstate &= ~XMSTATE_W_HDR; |
FUJITA Tomonori | 42f72aa | 2006-01-13 18:05:35 -0600 | [diff] [blame] | 1432 | if (conn->hdrdgst_en) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1433 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
| 1434 | (u8*)tcp_ctask->hdrext); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1435 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count); |
| 1436 | if (rc) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1437 | tcp_ctask->xmstate |= XMSTATE_W_HDR; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1438 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1439 | } |
| 1440 | |
| 1441 | static inline int |
| 1442 | handle_xmstate_data_digest(struct iscsi_conn *conn, |
| 1443 | struct iscsi_cmd_task *ctask) |
| 1444 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1445 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1446 | int rc; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1447 | |
| 1448 | tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST; |
| 1449 | debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1450 | rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, |
| 1451 | &tcp_ctask->datadigest, 0); |
| 1452 | if (rc) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1453 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1454 | debug_tcp("resent data digest 0x%x fail!\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1455 | tcp_ctask->datadigest); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1456 | } |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1457 | |
| 1458 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1459 | } |
| 1460 | |
| 1461 | static inline int |
| 1462 | handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| 1463 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1464 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| 1465 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1466 | int rc; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1467 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1468 | BUG_ON(!ctask->imm_count); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1469 | tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1470 | |
| 1471 | if (conn->datadgst_en) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1472 | iscsi_data_digest_init(tcp_conn, ctask); |
| 1473 | tcp_ctask->immdigest = 0; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1474 | } |
| 1475 | |
| 1476 | for (;;) { |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1477 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
| 1478 | &ctask->imm_count, &tcp_ctask->sent); |
| 1479 | if (rc) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1480 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1481 | if (conn->datadgst_en) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1482 | crypto_digest_final(tcp_conn->data_tx_tfm, |
| 1483 | (u8*)&tcp_ctask->immdigest); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1484 | debug_tcp("tx imm sendpage fail 0x%x\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1485 | tcp_ctask->datadigest); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1486 | } |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1487 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1488 | } |
| 1489 | if (conn->datadgst_en) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1490 | crypto_digest_update(tcp_conn->data_tx_tfm, |
| 1491 | &tcp_ctask->sendbuf.sg, 1); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1492 | |
| 1493 | if (!ctask->imm_count) |
| 1494 | break; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1495 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
| 1496 | &tcp_ctask->sg[tcp_ctask->sg_count++]); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1497 | } |
| 1498 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1499 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1500 | rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, |
| 1501 | &tcp_ctask->immdigest, 1); |
| 1502 | if (rc) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1503 | debug_tcp("sending imm digest 0x%x fail!\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1504 | tcp_ctask->immdigest); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1505 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1506 | } |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1507 | debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1508 | } |
| 1509 | |
| 1510 | return 0; |
| 1511 | } |
| 1512 | |
| 1513 | static inline int |
| 1514 | handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| 1515 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1516 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1517 | struct iscsi_data_task *dtask; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1518 | int rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1519 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1520 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
| 1521 | if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1522 | iscsi_unsolicit_data_init(conn, ctask); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1523 | dtask = tcp_ctask->dtask; |
Mike Christie | af97348 | 2005-09-12 21:01:32 -0500 | [diff] [blame] | 1524 | if (conn->hdrdgst_en) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1525 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
Mike Christie | af97348 | 2005-09-12 21:01:32 -0500 | [diff] [blame] | 1526 | (u8*)dtask->hdrext); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1527 | tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1528 | } |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1529 | |
| 1530 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count); |
| 1531 | if (rc) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1532 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
| 1533 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1534 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1535 | } |
| 1536 | |
| 1537 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1538 | ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1539 | return 0; |
| 1540 | } |
| 1541 | |
| 1542 | static inline int |
| 1543 | handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| 1544 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1545 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| 1546 | struct iscsi_data_task *dtask = tcp_ctask->dtask; |
| 1547 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1548 | int rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1549 | |
| 1550 | BUG_ON(!ctask->data_count); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1551 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1552 | |
| 1553 | if (conn->datadgst_en) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1554 | iscsi_data_digest_init(tcp_conn, ctask); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1555 | dtask->digest = 0; |
| 1556 | } |
| 1557 | |
| 1558 | for (;;) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1559 | int start = tcp_ctask->sent; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1560 | |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1561 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
| 1562 | &ctask->data_count, &tcp_ctask->sent); |
| 1563 | if (rc) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1564 | ctask->unsol_count -= tcp_ctask->sent - start; |
| 1565 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1566 | /* will continue with this ctask later.. */ |
| 1567 | if (conn->datadgst_en) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1568 | crypto_digest_final(tcp_conn->data_tx_tfm, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1569 | (u8 *)&dtask->digest); |
| 1570 | debug_tcp("tx uns data fail 0x%x\n", |
| 1571 | dtask->digest); |
| 1572 | } |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1573 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1574 | } |
| 1575 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1576 | BUG_ON(tcp_ctask->sent > ctask->total_length); |
| 1577 | ctask->unsol_count -= tcp_ctask->sent - start; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1578 | |
| 1579 | /* |
| 1580 | * XXX:we may run here with un-initial sendbuf. |
| 1581 | * so pass it |
| 1582 | */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1583 | if (conn->datadgst_en && tcp_ctask->sent - start > 0) |
| 1584 | crypto_digest_update(tcp_conn->data_tx_tfm, |
| 1585 | &tcp_ctask->sendbuf.sg, 1); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1586 | |
| 1587 | if (!ctask->data_count) |
| 1588 | break; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1589 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
| 1590 | &tcp_ctask->sg[tcp_ctask->sg_count++]); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1591 | } |
| 1592 | BUG_ON(ctask->unsol_count < 0); |
| 1593 | |
| 1594 | /* |
| 1595 | * Done with the Data-Out. Next, check if we need |
| 1596 | * to send another unsolicited Data-Out. |
| 1597 | */ |
| 1598 | if (ctask->unsol_count) { |
| 1599 | if (conn->datadgst_en) { |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1600 | rc = iscsi_digest_final_send(conn, ctask, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1601 | &dtask->digestbuf, |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1602 | &dtask->digest, 1); |
| 1603 | if (rc) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1604 | debug_tcp("send uns digest 0x%x fail\n", |
| 1605 | dtask->digest); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1606 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1607 | } |
| 1608 | debug_tcp("sending uns digest 0x%x, more uns\n", |
| 1609 | dtask->digest); |
| 1610 | } |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1611 | tcp_ctask->xmstate |= XMSTATE_UNS_INIT; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1612 | return 1; |
| 1613 | } |
| 1614 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1615 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1616 | rc = iscsi_digest_final_send(conn, ctask, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1617 | &dtask->digestbuf, |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1618 | &dtask->digest, 1); |
| 1619 | if (rc) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1620 | debug_tcp("send last uns digest 0x%x fail\n", |
| 1621 | dtask->digest); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1622 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1623 | } |
| 1624 | debug_tcp("sending uns digest 0x%x\n",dtask->digest); |
| 1625 | } |
| 1626 | |
| 1627 | return 0; |
| 1628 | } |
| 1629 | |
| 1630 | static inline int |
| 1631 | handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| 1632 | { |
| 1633 | struct iscsi_session *session = conn->session; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1634 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 1635 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| 1636 | struct iscsi_r2t_info *r2t = tcp_ctask->r2t; |
Mike Christie | ffbfe92 | 2006-05-18 20:31:36 -0500 | [diff] [blame] | 1637 | struct iscsi_data_task *dtask = &r2t->dtask; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1638 | int left, rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1639 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1640 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
| 1641 | tcp_ctask->dtask = dtask; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1642 | |
| 1643 | if (conn->datadgst_en) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1644 | iscsi_data_digest_init(tcp_conn, ctask); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1645 | dtask->digest = 0; |
| 1646 | } |
| 1647 | solicit_again: |
| 1648 | /* |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 1649 | * send Data-Out within this R2T sequence. |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1650 | */ |
| 1651 | if (!r2t->data_count) |
| 1652 | goto data_out_done; |
| 1653 | |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1654 | rc = iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent); |
| 1655 | if (rc) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1656 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1657 | /* will continue with this ctask later.. */ |
| 1658 | if (conn->datadgst_en) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1659 | crypto_digest_final(tcp_conn->data_tx_tfm, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1660 | (u8 *)&dtask->digest); |
| 1661 | debug_tcp("r2t data send fail 0x%x\n", dtask->digest); |
| 1662 | } |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1663 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1664 | } |
| 1665 | |
| 1666 | BUG_ON(r2t->data_count < 0); |
| 1667 | if (conn->datadgst_en) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1668 | crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg, |
| 1669 | 1); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1670 | |
| 1671 | if (r2t->data_count) { |
| 1672 | BUG_ON(ctask->sc->use_sg == 0); |
| 1673 | if (!iscsi_buf_left(&r2t->sendbuf)) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1674 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1675 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
| 1676 | r2t->sg += 1; |
| 1677 | } |
| 1678 | goto solicit_again; |
| 1679 | } |
| 1680 | |
| 1681 | data_out_done: |
| 1682 | /* |
| 1683 | * Done with this Data-Out. Next, check if we have |
| 1684 | * to send another Data-Out for this R2T. |
| 1685 | */ |
| 1686 | BUG_ON(r2t->data_length - r2t->sent < 0); |
| 1687 | left = r2t->data_length - r2t->sent; |
| 1688 | if (left) { |
| 1689 | if (conn->datadgst_en) { |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1690 | rc = iscsi_digest_final_send(conn, ctask, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1691 | &dtask->digestbuf, |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1692 | &dtask->digest, 1); |
| 1693 | if (rc) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1694 | debug_tcp("send r2t data digest 0x%x" |
| 1695 | "fail\n", dtask->digest); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1696 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1697 | } |
| 1698 | debug_tcp("r2t data send digest 0x%x\n", |
| 1699 | dtask->digest); |
| 1700 | } |
| 1701 | iscsi_solicit_data_cont(conn, ctask, r2t, left); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1702 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
| 1703 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1704 | return 1; |
| 1705 | } |
| 1706 | |
| 1707 | /* |
| 1708 | * Done with this R2T. Check if there are more |
| 1709 | * outstanding R2Ts ready to be processed. |
| 1710 | */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1711 | BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1712 | if (conn->datadgst_en) { |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1713 | rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, |
| 1714 | &dtask->digest, 1); |
| 1715 | if (rc) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1716 | debug_tcp("send last r2t data digest 0x%x" |
| 1717 | "fail\n", dtask->digest); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1718 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1719 | } |
| 1720 | debug_tcp("r2t done dout digest 0x%x\n", dtask->digest); |
| 1721 | } |
| 1722 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1723 | tcp_ctask->r2t_data_count -= r2t->data_length; |
| 1724 | tcp_ctask->r2t = NULL; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1725 | spin_lock_bh(&session->lock); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1726 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1727 | spin_unlock_bh(&session->lock); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1728 | if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { |
| 1729 | tcp_ctask->r2t = r2t; |
| 1730 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
| 1731 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1732 | return 1; |
| 1733 | } |
| 1734 | |
| 1735 | return 0; |
| 1736 | } |
| 1737 | |
| 1738 | static inline int |
| 1739 | handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| 1740 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1741 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| 1742 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 1743 | struct iscsi_data_task *dtask = tcp_ctask->dtask; |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 1744 | int sent = 0, rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1745 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1746 | tcp_ctask->xmstate &= ~XMSTATE_W_PAD; |
Mike Christie | 6e458cc | 2006-05-18 20:31:31 -0500 | [diff] [blame] | 1747 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1748 | tcp_ctask->pad_count); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1749 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, |
| 1750 | &sent); |
| 1751 | if (rc) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1752 | tcp_ctask->xmstate |= XMSTATE_W_PAD; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1753 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1754 | } |
| 1755 | |
| 1756 | if (conn->datadgst_en) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1757 | crypto_digest_update(tcp_conn->data_tx_tfm, |
| 1758 | &tcp_ctask->sendbuf.sg, 1); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1759 | /* imm data? */ |
| 1760 | if (!dtask) { |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1761 | rc = iscsi_digest_final_send(conn, ctask, |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1762 | &tcp_ctask->immbuf, |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1763 | &tcp_ctask->immdigest, 1); |
| 1764 | if (rc) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1765 | debug_tcp("send padding digest 0x%x" |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1766 | "fail!\n", tcp_ctask->immdigest); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1767 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1768 | } |
| 1769 | debug_tcp("done with padding, digest 0x%x\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1770 | tcp_ctask->datadigest); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1771 | } else { |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1772 | rc = iscsi_digest_final_send(conn, ctask, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1773 | &dtask->digestbuf, |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1774 | &dtask->digest, 1); |
| 1775 | if (rc) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1776 | debug_tcp("send padding digest 0x%x" |
| 1777 | "fail\n", dtask->digest); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1778 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1779 | } |
| 1780 | debug_tcp("done with padding, digest 0x%x\n", |
| 1781 | dtask->digest); |
| 1782 | } |
| 1783 | } |
| 1784 | |
| 1785 | return 0; |
| 1786 | } |
| 1787 | |
| 1788 | static int |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1789 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1790 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1791 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1792 | int rc = 0; |
| 1793 | |
| 1794 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1795 | conn->id, tcp_ctask->xmstate, ctask->itt); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1796 | |
| 1797 | /* |
| 1798 | * serialize with TMF AbortTask |
| 1799 | */ |
| 1800 | if (ctask->mtask) |
| 1801 | return rc; |
| 1802 | |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1803 | if (tcp_ctask->xmstate & XMSTATE_R_HDR) |
| 1804 | return handle_xmstate_r_hdr(conn, tcp_ctask); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1805 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1806 | if (tcp_ctask->xmstate & XMSTATE_W_HDR) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1807 | rc = handle_xmstate_w_hdr(conn, ctask); |
| 1808 | if (rc) |
| 1809 | return rc; |
| 1810 | } |
| 1811 | |
| 1812 | /* XXX: for data digest xmit recover */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1813 | if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1814 | rc = handle_xmstate_data_digest(conn, ctask); |
| 1815 | if (rc) |
| 1816 | return rc; |
| 1817 | } |
| 1818 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1819 | if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1820 | rc = handle_xmstate_imm_data(conn, ctask); |
| 1821 | if (rc) |
| 1822 | return rc; |
| 1823 | } |
| 1824 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1825 | if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1826 | BUG_ON(!ctask->unsol_count); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1827 | tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1828 | unsolicit_head_again: |
| 1829 | rc = handle_xmstate_uns_hdr(conn, ctask); |
| 1830 | if (rc) |
| 1831 | return rc; |
| 1832 | } |
| 1833 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1834 | if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1835 | rc = handle_xmstate_uns_data(conn, ctask); |
| 1836 | if (rc == 1) |
| 1837 | goto unsolicit_head_again; |
| 1838 | else if (rc) |
| 1839 | return rc; |
| 1840 | goto done; |
| 1841 | } |
| 1842 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1843 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1844 | struct iscsi_r2t_info *r2t; |
| 1845 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1846 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
| 1847 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
| 1848 | if (!tcp_ctask->r2t) |
| 1849 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1850 | sizeof(void*)); |
| 1851 | solicit_head_again: |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1852 | r2t = tcp_ctask->r2t; |
Mike Christie | af97348 | 2005-09-12 21:01:32 -0500 | [diff] [blame] | 1853 | if (conn->hdrdgst_en) |
FUJITA Tomonori | 42f72aa | 2006-01-13 18:05:35 -0600 | [diff] [blame] | 1854 | iscsi_hdr_digest(conn, &r2t->headbuf, |
Mike Christie | ffbfe92 | 2006-05-18 20:31:36 -0500 | [diff] [blame] | 1855 | (u8*)r2t->dtask.hdrext); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1856 | rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count); |
| 1857 | if (rc) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1858 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
| 1859 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 1860 | return rc; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1861 | } |
| 1862 | |
| 1863 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", |
| 1864 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, |
| 1865 | r2t->sent); |
| 1866 | } |
| 1867 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1868 | if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1869 | rc = handle_xmstate_sol_data(conn, ctask); |
| 1870 | if (rc == 1) |
| 1871 | goto solicit_head_again; |
| 1872 | if (rc) |
| 1873 | return rc; |
| 1874 | } |
| 1875 | |
| 1876 | done: |
| 1877 | /* |
| 1878 | * Last thing to check is whether we need to send write |
| 1879 | * padding. Note that we check for xmstate equality, not just the bit. |
| 1880 | */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1881 | if (tcp_ctask->xmstate == XMSTATE_W_PAD) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1882 | rc = handle_xmstate_w_pad(conn, ctask); |
| 1883 | |
| 1884 | return rc; |
| 1885 | } |
| 1886 | |
Mike Christie | 7b8631b | 2006-01-13 18:05:50 -0600 | [diff] [blame] | 1887 | static struct iscsi_cls_conn * |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1888 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1889 | { |
Mike Christie | 7b8631b | 2006-01-13 18:05:50 -0600 | [diff] [blame] | 1890 | struct iscsi_conn *conn; |
| 1891 | struct iscsi_cls_conn *cls_conn; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1892 | struct iscsi_tcp_conn *tcp_conn; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1893 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1894 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
Mike Christie | 7b8631b | 2006-01-13 18:05:50 -0600 | [diff] [blame] | 1895 | if (!cls_conn) |
| 1896 | return NULL; |
| 1897 | conn = cls_conn->dd_data; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1898 | /* |
| 1899 | * due to strange issues with iser these are not set |
| 1900 | * in iscsi_conn_setup |
| 1901 | */ |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1902 | conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; |
| 1903 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1904 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
| 1905 | if (!tcp_conn) |
| 1906 | goto tcp_conn_alloc_fail; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1907 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1908 | conn->dd_data = tcp_conn; |
| 1909 | tcp_conn->iscsi_conn = conn; |
| 1910 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
| 1911 | /* initial operational parameters */ |
| 1912 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
| 1913 | tcp_conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1914 | |
| 1915 | /* allocate initial PDU receive place holder */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1916 | if (tcp_conn->data_size <= PAGE_SIZE) |
| 1917 | tcp_conn->data = kmalloc(tcp_conn->data_size, GFP_KERNEL); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1918 | else |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1919 | tcp_conn->data = (void*)__get_free_pages(GFP_KERNEL, |
| 1920 | get_order(tcp_conn->data_size)); |
| 1921 | if (!tcp_conn->data) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1922 | goto max_recv_dlenght_alloc_fail; |
| 1923 | |
Mike Christie | 7b8631b | 2006-01-13 18:05:50 -0600 | [diff] [blame] | 1924 | return cls_conn; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1925 | |
| 1926 | max_recv_dlenght_alloc_fail: |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1927 | kfree(tcp_conn); |
| 1928 | tcp_conn_alloc_fail: |
| 1929 | iscsi_conn_teardown(cls_conn); |
Mike Christie | 7b8631b | 2006-01-13 18:05:50 -0600 | [diff] [blame] | 1930 | return NULL; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1931 | } |
| 1932 | |
| 1933 | static void |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1934 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1935 | { |
Mike Christie | 7b8631b | 2006-01-13 18:05:50 -0600 | [diff] [blame] | 1936 | struct iscsi_conn *conn = cls_conn->dd_data; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1937 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 1938 | int digest = 0; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1939 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1940 | if (conn->hdrdgst_en || conn->datadgst_en) |
| 1941 | digest = 1; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1942 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1943 | iscsi_conn_teardown(cls_conn); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1944 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1945 | /* now free tcp_conn */ |
| 1946 | if (digest) { |
| 1947 | if (tcp_conn->tx_tfm) |
| 1948 | crypto_free_tfm(tcp_conn->tx_tfm); |
| 1949 | if (tcp_conn->rx_tfm) |
| 1950 | crypto_free_tfm(tcp_conn->rx_tfm); |
| 1951 | if (tcp_conn->data_tx_tfm) |
| 1952 | crypto_free_tfm(tcp_conn->data_tx_tfm); |
| 1953 | if (tcp_conn->data_rx_tfm) |
| 1954 | crypto_free_tfm(tcp_conn->data_rx_tfm); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1955 | } |
| 1956 | |
| 1957 | /* free conn->data, size = MaxRecvDataSegmentLength */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1958 | if (tcp_conn->data_size <= PAGE_SIZE) |
| 1959 | kfree(tcp_conn->data); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1960 | else |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1961 | free_pages((unsigned long)tcp_conn->data, |
| 1962 | get_order(tcp_conn->data_size)); |
| 1963 | kfree(tcp_conn); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1964 | } |
| 1965 | |
| 1966 | static int |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1967 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
Or Gerlitz | 264faaa | 2006-05-02 19:46:36 -0500 | [diff] [blame] | 1968 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1969 | int is_leading) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1970 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1971 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 1972 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1973 | struct sock *sk; |
| 1974 | struct socket *sock; |
| 1975 | int err; |
| 1976 | |
| 1977 | /* lookup for existing socket */ |
Or Gerlitz | 264faaa | 2006-05-02 19:46:36 -0500 | [diff] [blame] | 1978 | sock = sockfd_lookup((int)transport_eph, &err); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1979 | if (!sock) { |
| 1980 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); |
| 1981 | return -EEXIST; |
| 1982 | } |
| 1983 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 1984 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
| 1985 | if (err) |
| 1986 | return err; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1987 | |
Mike Christie | 67a6111 | 2006-05-30 00:37:20 -0500 | [diff] [blame] | 1988 | /* bind iSCSI connection and socket */ |
| 1989 | tcp_conn->sock = sock; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1990 | |
Mike Christie | 67a6111 | 2006-05-30 00:37:20 -0500 | [diff] [blame] | 1991 | /* setup Socket parameters */ |
| 1992 | sk = sock->sk; |
| 1993 | sk->sk_reuse = 1; |
| 1994 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ |
| 1995 | sk->sk_allocation = GFP_ATOMIC; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1996 | |
Mike Christie | 67a6111 | 2006-05-30 00:37:20 -0500 | [diff] [blame] | 1997 | /* FIXME: disable Nagle's algorithm */ |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 1998 | |
Mike Christie | 67a6111 | 2006-05-30 00:37:20 -0500 | [diff] [blame] | 1999 | /* |
| 2000 | * Intercept TCP callbacks for sendfile like receive |
| 2001 | * processing. |
| 2002 | */ |
| 2003 | conn->recv_lock = &sk->sk_callback_lock; |
| 2004 | iscsi_conn_set_callbacks(conn); |
| 2005 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; |
| 2006 | /* |
| 2007 | * set receive state machine into initial state |
| 2008 | */ |
| 2009 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2010 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2011 | return 0; |
| 2012 | } |
| 2013 | |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 2014 | static void |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2015 | iscsi_tcp_suspend_conn_rx(struct iscsi_conn *conn) |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 2016 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2017 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2018 | struct sock *sk; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2019 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2020 | if (!tcp_conn->sock) |
| 2021 | return; |
| 2022 | |
| 2023 | sk = tcp_conn->sock->sk; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2024 | write_lock_bh(&sk->sk_callback_lock); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2025 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2026 | write_unlock_bh(&sk->sk_callback_lock); |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 2027 | } |
| 2028 | |
| 2029 | static void |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2030 | iscsi_tcp_terminate_conn(struct iscsi_conn *conn) |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 2031 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2032 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 2033 | |
| 2034 | if (!tcp_conn->sock) |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 2035 | return; |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 2036 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2037 | sock_hold(tcp_conn->sock->sk); |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 2038 | iscsi_conn_restore_callbacks(conn); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2039 | sock_put(tcp_conn->sock->sk); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2040 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2041 | sock_release(tcp_conn->sock); |
| 2042 | tcp_conn->sock = NULL; |
| 2043 | conn->recv_lock = NULL; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2044 | } |
| 2045 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2046 | /* called with host lock */ |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 2047 | static void |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2048 | iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask, |
| 2049 | char *data, uint32_t data_size) |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 2050 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2051 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 2052 | |
Mike Christie | 6e458cc | 2006-05-18 20:31:31 -0500 | [diff] [blame] | 2053 | iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr, |
| 2054 | sizeof(struct iscsi_hdr)); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2055 | tcp_mtask->xmstate = XMSTATE_IMM_HDR; |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame^] | 2056 | tcp_mtask->sent = 0; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2057 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2058 | if (mtask->data_count) |
| 2059 | iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2060 | mtask->data_count); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2061 | } |
| 2062 | |
| 2063 | static int |
| 2064 | iscsi_r2tpool_alloc(struct iscsi_session *session) |
| 2065 | { |
| 2066 | int i; |
| 2067 | int cmd_i; |
| 2068 | |
| 2069 | /* |
| 2070 | * initialize per-task: R2T pool and xmit queue |
| 2071 | */ |
| 2072 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { |
| 2073 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2074 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2075 | |
| 2076 | /* |
| 2077 | * pre-allocated x4 as much r2ts to handle race when |
| 2078 | * target acks DataOut faster than we data_xmit() queues |
| 2079 | * could replenish r2tqueue. |
| 2080 | */ |
| 2081 | |
| 2082 | /* R2T pool */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2083 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
| 2084 | (void***)&tcp_ctask->r2ts, |
| 2085 | sizeof(struct iscsi_r2t_info))) { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2086 | goto r2t_alloc_fail; |
| 2087 | } |
| 2088 | |
| 2089 | /* R2T xmit queue */ |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2090 | tcp_ctask->r2tqueue = kfifo_alloc( |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2091 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2092 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
| 2093 | iscsi_pool_free(&tcp_ctask->r2tpool, |
| 2094 | (void**)tcp_ctask->r2ts); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2095 | goto r2t_alloc_fail; |
| 2096 | } |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2097 | } |
| 2098 | |
| 2099 | return 0; |
| 2100 | |
| 2101 | r2t_alloc_fail: |
| 2102 | for (i = 0; i < cmd_i; i++) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2103 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
| 2104 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| 2105 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2106 | kfifo_free(tcp_ctask->r2tqueue); |
| 2107 | iscsi_pool_free(&tcp_ctask->r2tpool, |
| 2108 | (void**)tcp_ctask->r2ts); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2109 | } |
| 2110 | return -ENOMEM; |
| 2111 | } |
| 2112 | |
| 2113 | static void |
| 2114 | iscsi_r2tpool_free(struct iscsi_session *session) |
| 2115 | { |
| 2116 | int i; |
| 2117 | |
| 2118 | for (i = 0; i < session->cmds_max; i++) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2119 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
| 2120 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| 2121 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2122 | kfifo_free(tcp_ctask->r2tqueue); |
| 2123 | iscsi_pool_free(&tcp_ctask->r2tpool, |
| 2124 | (void**)tcp_ctask->r2ts); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2125 | } |
| 2126 | } |
| 2127 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2128 | static int |
Mike Christie | 7b7232f | 2006-02-01 21:06:49 -0600 | [diff] [blame] | 2129 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2130 | char *buf, int buflen) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2131 | { |
Mike Christie | 7b7232f | 2006-02-01 21:06:49 -0600 | [diff] [blame] | 2132 | struct iscsi_conn *conn = cls_conn->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2133 | struct iscsi_session *session = conn->session; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2134 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2135 | int value; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2136 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2137 | switch(param) { |
| 2138 | case ISCSI_PARAM_MAX_RECV_DLENGTH: { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2139 | char *saveptr = tcp_conn->data; |
Al Viro | b53cb2a | 2005-12-15 09:17:19 +0000 | [diff] [blame] | 2140 | gfp_t flags = GFP_KERNEL; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2141 | |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2142 | sscanf(buf, "%d", &value); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2143 | if (tcp_conn->data_size >= value) { |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2144 | iscsi_set_param(cls_conn, param, buf, buflen); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2145 | break; |
| 2146 | } |
| 2147 | |
| 2148 | spin_lock_bh(&session->lock); |
| 2149 | if (conn->stop_stage == STOP_CONN_RECOVER) |
| 2150 | flags = GFP_ATOMIC; |
| 2151 | spin_unlock_bh(&session->lock); |
| 2152 | |
| 2153 | if (value <= PAGE_SIZE) |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2154 | tcp_conn->data = kmalloc(value, flags); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2155 | else |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2156 | tcp_conn->data = (void*)__get_free_pages(flags, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2157 | get_order(value)); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2158 | if (tcp_conn->data == NULL) { |
| 2159 | tcp_conn->data = saveptr; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2160 | return -ENOMEM; |
| 2161 | } |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2162 | if (tcp_conn->data_size <= PAGE_SIZE) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2163 | kfree(saveptr); |
| 2164 | else |
| 2165 | free_pages((unsigned long)saveptr, |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2166 | get_order(tcp_conn->data_size)); |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2167 | iscsi_set_param(cls_conn, param, buf, buflen); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2168 | tcp_conn->data_size = value; |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2169 | break; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2170 | } |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2171 | case ISCSI_PARAM_HDRDGST_EN: |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2172 | iscsi_set_param(cls_conn, param, buf, buflen); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2173 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2174 | if (conn->hdrdgst_en) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2175 | tcp_conn->hdr_size += sizeof(__u32); |
| 2176 | if (!tcp_conn->tx_tfm) |
| 2177 | tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c", |
| 2178 | 0); |
| 2179 | if (!tcp_conn->tx_tfm) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2180 | return -ENOMEM; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2181 | if (!tcp_conn->rx_tfm) |
| 2182 | tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c", |
| 2183 | 0); |
| 2184 | if (!tcp_conn->rx_tfm) { |
| 2185 | crypto_free_tfm(tcp_conn->tx_tfm); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2186 | return -ENOMEM; |
| 2187 | } |
| 2188 | } else { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2189 | if (tcp_conn->tx_tfm) |
| 2190 | crypto_free_tfm(tcp_conn->tx_tfm); |
| 2191 | if (tcp_conn->rx_tfm) |
| 2192 | crypto_free_tfm(tcp_conn->rx_tfm); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2193 | } |
| 2194 | break; |
| 2195 | case ISCSI_PARAM_DATADGST_EN: |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2196 | iscsi_set_param(cls_conn, param, buf, buflen); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2197 | if (conn->datadgst_en) { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2198 | if (!tcp_conn->data_tx_tfm) |
| 2199 | tcp_conn->data_tx_tfm = |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2200 | crypto_alloc_tfm("crc32c", 0); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2201 | if (!tcp_conn->data_tx_tfm) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2202 | return -ENOMEM; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2203 | if (!tcp_conn->data_rx_tfm) |
| 2204 | tcp_conn->data_rx_tfm = |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2205 | crypto_alloc_tfm("crc32c", 0); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2206 | if (!tcp_conn->data_rx_tfm) { |
| 2207 | crypto_free_tfm(tcp_conn->data_tx_tfm); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2208 | return -ENOMEM; |
| 2209 | } |
| 2210 | } else { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2211 | if (tcp_conn->data_tx_tfm) |
| 2212 | crypto_free_tfm(tcp_conn->data_tx_tfm); |
| 2213 | if (tcp_conn->data_rx_tfm) |
| 2214 | crypto_free_tfm(tcp_conn->data_rx_tfm); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2215 | } |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2216 | tcp_conn->sendpage = conn->datadgst_en ? |
| 2217 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2218 | break; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2219 | case ISCSI_PARAM_MAX_R2T: |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2220 | sscanf(buf, "%d", &value); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2221 | if (session->max_r2t == roundup_pow_of_two(value)) |
| 2222 | break; |
| 2223 | iscsi_r2tpool_free(session); |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2224 | iscsi_set_param(cls_conn, param, buf, buflen); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2225 | if (session->max_r2t & (session->max_r2t - 1)) |
| 2226 | session->max_r2t = roundup_pow_of_two(session->max_r2t); |
| 2227 | if (iscsi_r2tpool_alloc(session)) |
| 2228 | return -ENOMEM; |
| 2229 | break; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2230 | default: |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2231 | return iscsi_set_param(cls_conn, param, buf, buflen); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2232 | } |
| 2233 | |
| 2234 | return 0; |
| 2235 | } |
| 2236 | |
| 2237 | static int |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2238 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
| 2239 | enum iscsi_param param, char *buf) |
Mike Christie | 7b8631b | 2006-01-13 18:05:50 -0600 | [diff] [blame] | 2240 | { |
Mike Christie | 7b7232f | 2006-02-01 21:06:49 -0600 | [diff] [blame] | 2241 | struct iscsi_conn *conn = cls_conn->dd_data; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2242 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
Mike Christie | fd7255f | 2006-04-06 21:13:36 -0500 | [diff] [blame] | 2243 | struct inet_sock *inet; |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2244 | struct ipv6_pinfo *np; |
| 2245 | struct sock *sk; |
| 2246 | int len; |
Mike Christie | 7b8631b | 2006-01-13 18:05:50 -0600 | [diff] [blame] | 2247 | |
| 2248 | switch(param) { |
Mike Christie | fd7255f | 2006-04-06 21:13:36 -0500 | [diff] [blame] | 2249 | case ISCSI_PARAM_CONN_PORT: |
| 2250 | mutex_lock(&conn->xmitmutex); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2251 | if (!tcp_conn->sock) { |
Mike Christie | fd7255f | 2006-04-06 21:13:36 -0500 | [diff] [blame] | 2252 | mutex_unlock(&conn->xmitmutex); |
| 2253 | return -EINVAL; |
| 2254 | } |
| 2255 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2256 | inet = inet_sk(tcp_conn->sock->sk); |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2257 | len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport)); |
Mike Christie | fd7255f | 2006-04-06 21:13:36 -0500 | [diff] [blame] | 2258 | mutex_unlock(&conn->xmitmutex); |
Mike Christie | 8d2860b | 2006-05-02 19:46:47 -0500 | [diff] [blame] | 2259 | break; |
Mike Christie | fd7255f | 2006-04-06 21:13:36 -0500 | [diff] [blame] | 2260 | case ISCSI_PARAM_CONN_ADDRESS: |
| 2261 | mutex_lock(&conn->xmitmutex); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2262 | if (!tcp_conn->sock) { |
Mike Christie | fd7255f | 2006-04-06 21:13:36 -0500 | [diff] [blame] | 2263 | mutex_unlock(&conn->xmitmutex); |
| 2264 | return -EINVAL; |
| 2265 | } |
| 2266 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2267 | sk = tcp_conn->sock->sk; |
Mike Christie | fd7255f | 2006-04-06 21:13:36 -0500 | [diff] [blame] | 2268 | if (sk->sk_family == PF_INET) { |
| 2269 | inet = inet_sk(sk); |
| 2270 | len = sprintf(buf, "%u.%u.%u.%u\n", |
| 2271 | NIPQUAD(inet->daddr)); |
| 2272 | } else { |
| 2273 | np = inet6_sk(sk); |
| 2274 | len = sprintf(buf, |
| 2275 | "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", |
| 2276 | NIP6(np->daddr)); |
| 2277 | } |
| 2278 | mutex_unlock(&conn->xmitmutex); |
| 2279 | break; |
| 2280 | default: |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2281 | return iscsi_conn_get_param(cls_conn, param, buf); |
Mike Christie | fd7255f | 2006-04-06 21:13:36 -0500 | [diff] [blame] | 2282 | } |
| 2283 | |
| 2284 | return len; |
| 2285 | } |
| 2286 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2287 | static void |
Mike Christie | 7b7232f | 2006-02-01 21:06:49 -0600 | [diff] [blame] | 2288 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2289 | { |
Mike Christie | 7b7232f | 2006-02-01 21:06:49 -0600 | [diff] [blame] | 2290 | struct iscsi_conn *conn = cls_conn->dd_data; |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2291 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2292 | |
| 2293 | stats->txdata_octets = conn->txdata_octets; |
| 2294 | stats->rxdata_octets = conn->rxdata_octets; |
| 2295 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; |
| 2296 | stats->dataout_pdus = conn->dataout_pdus_cnt; |
| 2297 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; |
| 2298 | stats->datain_pdus = conn->datain_pdus_cnt; |
| 2299 | stats->r2t_pdus = conn->r2t_pdus_cnt; |
| 2300 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; |
| 2301 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; |
| 2302 | stats->custom_length = 3; |
| 2303 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2304 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2305 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2306 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2307 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
| 2308 | stats->custom[2].value = conn->eh_abort_cnt; |
| 2309 | } |
| 2310 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2311 | static struct iscsi_cls_session * |
| 2312 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, |
| 2313 | struct scsi_transport_template *scsit, |
| 2314 | uint32_t initial_cmdsn, uint32_t *hostno) |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2315 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2316 | struct iscsi_cls_session *cls_session; |
| 2317 | struct iscsi_session *session; |
| 2318 | uint32_t hn; |
| 2319 | int cmd_i; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2320 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2321 | cls_session = iscsi_session_setup(iscsit, scsit, |
| 2322 | sizeof(struct iscsi_tcp_cmd_task), |
| 2323 | sizeof(struct iscsi_tcp_mgmt_task), |
| 2324 | initial_cmdsn, &hn); |
| 2325 | if (!cls_session) |
| 2326 | return NULL; |
| 2327 | *hostno = hn; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2328 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2329 | session = class_to_transport_session(cls_session); |
| 2330 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { |
| 2331 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; |
| 2332 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| 2333 | |
| 2334 | ctask->hdr = &tcp_ctask->hdr; |
| 2335 | } |
| 2336 | |
| 2337 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { |
| 2338 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; |
| 2339 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
| 2340 | |
| 2341 | mtask->hdr = &tcp_mtask->hdr; |
| 2342 | } |
| 2343 | |
| 2344 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) |
| 2345 | goto r2tpool_alloc_fail; |
| 2346 | |
| 2347 | return cls_session; |
| 2348 | |
| 2349 | r2tpool_alloc_fail: |
| 2350 | iscsi_session_teardown(cls_session); |
| 2351 | return NULL; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2352 | } |
| 2353 | |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2354 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
| 2355 | { |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2356 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
| 2357 | iscsi_session_teardown(cls_session); |
| 2358 | } |
| 2359 | |
| 2360 | static struct scsi_host_template iscsi_sht = { |
Mike Christie | e0ecae8 | 2006-05-18 20:31:43 -0500 | [diff] [blame] | 2361 | .name = "iSCSI Initiator over TCP/IP, v" |
| 2362 | ISCSI_TCP_VERSION, |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2363 | .queuecommand = iscsi_queuecommand, |
| 2364 | .change_queue_depth = iscsi_change_queue_depth, |
| 2365 | .can_queue = ISCSI_XMIT_CMDS_MAX - 1, |
| 2366 | .sg_tablesize = ISCSI_SG_TABLESIZE, |
| 2367 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
| 2368 | .eh_abort_handler = iscsi_eh_abort, |
| 2369 | .eh_host_reset_handler = iscsi_eh_host_reset, |
| 2370 | .use_clustering = DISABLE_CLUSTERING, |
| 2371 | .proc_name = "iscsi_tcp", |
| 2372 | .this_id = -1, |
| 2373 | }; |
| 2374 | |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2375 | static struct iscsi_transport iscsi_tcp_transport = { |
| 2376 | .owner = THIS_MODULE, |
| 2377 | .name = "tcp", |
| 2378 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
| 2379 | | CAP_DATADGST, |
Mike Christie | fd7255f | 2006-04-06 21:13:36 -0500 | [diff] [blame] | 2380 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
| 2381 | ISCSI_MAX_XMIT_DLENGTH | |
| 2382 | ISCSI_HDRDGST_EN | |
| 2383 | ISCSI_DATADGST_EN | |
| 2384 | ISCSI_INITIAL_R2T_EN | |
| 2385 | ISCSI_MAX_R2T | |
| 2386 | ISCSI_IMM_DATA_EN | |
| 2387 | ISCSI_FIRST_BURST | |
| 2388 | ISCSI_MAX_BURST | |
| 2389 | ISCSI_PDU_INORDER_EN | |
| 2390 | ISCSI_DATASEQ_INORDER_EN | |
| 2391 | ISCSI_ERL | |
| 2392 | ISCSI_CONN_PORT | |
Mike Christie | 8d2860b | 2006-05-02 19:46:47 -0500 | [diff] [blame] | 2393 | ISCSI_CONN_ADDRESS | |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2394 | ISCSI_EXP_STATSN | |
| 2395 | ISCSI_PERSISTENT_PORT | |
| 2396 | ISCSI_PERSISTENT_ADDRESS | |
| 2397 | ISCSI_TARGET_NAME | |
| 2398 | ISCSI_TPGT, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2399 | .host_template = &iscsi_sht, |
Mike Christie | 7b8631b | 2006-01-13 18:05:50 -0600 | [diff] [blame] | 2400 | .conndata_size = sizeof(struct iscsi_conn), |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2401 | .max_conn = 1, |
| 2402 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2403 | /* session management */ |
| 2404 | .create_session = iscsi_tcp_session_create, |
| 2405 | .destroy_session = iscsi_tcp_session_destroy, |
| 2406 | /* connection management */ |
| 2407 | .create_conn = iscsi_tcp_conn_create, |
| 2408 | .bind_conn = iscsi_tcp_conn_bind, |
| 2409 | .destroy_conn = iscsi_tcp_conn_destroy, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2410 | .set_param = iscsi_conn_set_param, |
Mike Christie | 5c75b7f | 2006-06-28 12:00:26 -0500 | [diff] [blame] | 2411 | .get_conn_param = iscsi_tcp_conn_get_param, |
Mike Christie | 7b8631b | 2006-01-13 18:05:50 -0600 | [diff] [blame] | 2412 | .get_session_param = iscsi_session_get_param, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2413 | .start_conn = iscsi_conn_start, |
| 2414 | .stop_conn = iscsi_conn_stop, |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2415 | /* these are called as part of conn recovery */ |
| 2416 | .suspend_conn_recv = iscsi_tcp_suspend_conn_rx, |
| 2417 | .terminate_conn = iscsi_tcp_terminate_conn, |
| 2418 | /* IO */ |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2419 | .send_pdu = iscsi_conn_send_pdu, |
| 2420 | .get_stats = iscsi_conn_get_stats, |
Mike Christie | 5bb0b55 | 2006-04-06 21:26:46 -0500 | [diff] [blame] | 2421 | .init_cmd_task = iscsi_tcp_cmd_init, |
| 2422 | .init_mgmt_task = iscsi_tcp_mgmt_init, |
| 2423 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, |
| 2424 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, |
| 2425 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, |
| 2426 | /* recovery */ |
Mike Christie | 30a6c65 | 2006-04-06 21:13:39 -0500 | [diff] [blame] | 2427 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2428 | }; |
| 2429 | |
| 2430 | static int __init |
| 2431 | iscsi_tcp_init(void) |
| 2432 | { |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2433 | if (iscsi_max_lun < 1) { |
Or Gerlitz | be2df72 | 2006-05-02 19:46:43 -0500 | [diff] [blame] | 2434 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
| 2435 | iscsi_max_lun); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2436 | return -EINVAL; |
| 2437 | } |
| 2438 | iscsi_tcp_transport.max_lun = iscsi_max_lun; |
| 2439 | |
Mike Christie | 7b8631b | 2006-01-13 18:05:50 -0600 | [diff] [blame] | 2440 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
Mike Christie | ffbfe92 | 2006-05-18 20:31:36 -0500 | [diff] [blame] | 2441 | return -ENODEV; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2442 | |
Mike Christie | 7b8631b | 2006-01-13 18:05:50 -0600 | [diff] [blame] | 2443 | return 0; |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2444 | } |
| 2445 | |
| 2446 | static void __exit |
| 2447 | iscsi_tcp_exit(void) |
| 2448 | { |
| 2449 | iscsi_unregister_transport(&iscsi_tcp_transport); |
Alex Aizman | 7ba2471 | 2005-08-04 19:30:08 -0700 | [diff] [blame] | 2450 | } |
| 2451 | |
| 2452 | module_init(iscsi_tcp_init); |
| 2453 | module_exit(iscsi_tcp_exit); |