Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * cxgb3i_pdu.c: Chelsio S3xx iSCSI driver. |
| 3 | * |
| 4 | * Copyright (c) 2008 Chelsio Communications, Inc. |
| 5 | * Copyright (c) 2008 Mike Christie |
| 6 | * Copyright (c) 2008 Red Hat, Inc. All rights reserved. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation. |
| 11 | * |
| 12 | * Written by: Karen Xie (kxie@chelsio.com) |
| 13 | */ |
| 14 | |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/slab.h> |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 16 | #include <linux/skbuff.h> |
| 17 | #include <linux/crypto.h> |
| 18 | #include <scsi/scsi_cmnd.h> |
| 19 | #include <scsi/scsi_host.h> |
| 20 | |
| 21 | #include "cxgb3i.h" |
| 22 | #include "cxgb3i_pdu.h" |
| 23 | |
| 24 | #ifdef __DEBUG_CXGB3I_RX__ |
| 25 | #define cxgb3i_rx_debug cxgb3i_log_debug |
| 26 | #else |
| 27 | #define cxgb3i_rx_debug(fmt...) |
| 28 | #endif |
| 29 | |
| 30 | #ifdef __DEBUG_CXGB3I_TX__ |
| 31 | #define cxgb3i_tx_debug cxgb3i_log_debug |
| 32 | #else |
| 33 | #define cxgb3i_tx_debug(fmt...) |
| 34 | #endif |
| 35 | |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 36 | /* always allocate rooms for AHS */ |
| 37 | #define SKB_TX_PDU_HEADER_LEN \ |
| 38 | (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE) |
| 39 | static unsigned int skb_extra_headroom; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 40 | static struct page *pad_page; |
| 41 | |
| 42 | /* |
| 43 | * pdu receive, interact with libiscsi_tcp |
| 44 | */ |
| 45 | static inline int read_pdu_skb(struct iscsi_conn *conn, struct sk_buff *skb, |
| 46 | unsigned int offset, int offloaded) |
| 47 | { |
| 48 | int status = 0; |
| 49 | int bytes_read; |
| 50 | |
| 51 | bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status); |
| 52 | switch (status) { |
| 53 | case ISCSI_TCP_CONN_ERR: |
| 54 | return -EIO; |
| 55 | case ISCSI_TCP_SUSPENDED: |
| 56 | /* no transfer - just have caller flush queue */ |
| 57 | return bytes_read; |
| 58 | case ISCSI_TCP_SKB_DONE: |
| 59 | /* |
| 60 | * pdus should always fit in the skb and we should get |
| 61 | * segment done notifcation. |
| 62 | */ |
| 63 | iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb."); |
| 64 | return -EFAULT; |
| 65 | case ISCSI_TCP_SEGMENT_DONE: |
| 66 | return bytes_read; |
| 67 | default: |
| 68 | iscsi_conn_printk(KERN_ERR, conn, "Invalid iscsi_tcp_recv_skb " |
| 69 | "status %d\n", status); |
| 70 | return -EINVAL; |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | static int cxgb3i_conn_read_pdu_skb(struct iscsi_conn *conn, |
| 75 | struct sk_buff *skb) |
| 76 | { |
| 77 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 78 | bool offloaded = 0; |
| 79 | unsigned int offset; |
| 80 | int rc; |
| 81 | |
| 82 | cxgb3i_rx_debug("conn 0x%p, skb 0x%p, len %u, flag 0x%x.\n", |
| 83 | conn, skb, skb->len, skb_ulp_mode(skb)); |
| 84 | |
| 85 | if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) { |
| 86 | iscsi_conn_failure(conn, ISCSI_ERR_PROTO); |
| 87 | return -EIO; |
| 88 | } |
| 89 | |
| 90 | if (conn->hdrdgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_HCRC_ERROR)) { |
| 91 | iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST); |
| 92 | return -EIO; |
| 93 | } |
| 94 | |
| 95 | if (conn->datadgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_DCRC_ERROR)) { |
| 96 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
| 97 | return -EIO; |
| 98 | } |
| 99 | |
| 100 | /* iscsi hdr */ |
| 101 | rc = read_pdu_skb(conn, skb, 0, 0); |
| 102 | if (rc <= 0) |
| 103 | return rc; |
| 104 | |
| 105 | if (iscsi_tcp_recv_segment_is_hdr(tcp_conn)) |
| 106 | return 0; |
| 107 | |
| 108 | offset = rc; |
| 109 | if (conn->hdrdgst_en) |
| 110 | offset += ISCSI_DIGEST_SIZE; |
| 111 | |
| 112 | /* iscsi data */ |
| 113 | if (skb_ulp_mode(skb) & ULP2_FLAG_DATA_DDPED) { |
| 114 | cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, ddp'ed, " |
| 115 | "itt 0x%x.\n", |
| 116 | skb, |
| 117 | tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK, |
| 118 | tcp_conn->in.datalen, |
| 119 | ntohl(tcp_conn->in.hdr->itt)); |
| 120 | offloaded = 1; |
| 121 | } else { |
| 122 | cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, NOT ddp'ed, " |
| 123 | "itt 0x%x.\n", |
| 124 | skb, |
| 125 | tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK, |
| 126 | tcp_conn->in.datalen, |
| 127 | ntohl(tcp_conn->in.hdr->itt)); |
| 128 | offset += sizeof(struct cpl_iscsi_hdr_norss); |
| 129 | } |
| 130 | |
| 131 | rc = read_pdu_skb(conn, skb, offset, offloaded); |
| 132 | if (rc < 0) |
| 133 | return rc; |
| 134 | else |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * pdu transmit, interact with libiscsi_tcp |
| 140 | */ |
| 141 | static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc) |
| 142 | { |
| 143 | u8 submode = 0; |
| 144 | |
| 145 | if (hcrc) |
| 146 | submode |= 1; |
| 147 | if (dcrc) |
| 148 | submode |= 2; |
| 149 | skb_ulp_mode(skb) = (ULP_MODE_ISCSI << 4) | submode; |
| 150 | } |
| 151 | |
| 152 | void cxgb3i_conn_cleanup_task(struct iscsi_task *task) |
| 153 | { |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 154 | struct cxgb3i_task_data *tdata = task->dd_data + |
| 155 | sizeof(struct iscsi_tcp_task); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 156 | |
| 157 | /* never reached the xmit task callout */ |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 158 | if (tdata->skb) |
| 159 | __kfree_skb(tdata->skb); |
| 160 | memset(tdata, 0, sizeof(struct cxgb3i_task_data)); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 161 | |
| 162 | /* MNC - Do we need a check in case this is called but |
| 163 | * cxgb3i_conn_alloc_pdu has never been called on the task */ |
| 164 | cxgb3i_release_itt(task, task->hdr_itt); |
| 165 | iscsi_tcp_cleanup_task(task); |
| 166 | } |
| 167 | |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 168 | static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt, |
| 169 | unsigned int offset, unsigned int *off, |
| 170 | struct scatterlist **sgp) |
| 171 | { |
| 172 | int i; |
| 173 | struct scatterlist *sg; |
| 174 | |
| 175 | for_each_sg(sgl, sg, sgcnt, i) { |
| 176 | if (offset < sg->length) { |
| 177 | *off = offset; |
| 178 | *sgp = sg; |
| 179 | return 0; |
| 180 | } |
| 181 | offset -= sg->length; |
| 182 | } |
| 183 | return -EFAULT; |
| 184 | } |
| 185 | |
| 186 | static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset, |
| 187 | unsigned int dlen, skb_frag_t *frags, |
| 188 | int frag_max) |
| 189 | { |
| 190 | unsigned int datalen = dlen; |
| 191 | unsigned int sglen = sg->length - sgoffset; |
| 192 | struct page *page = sg_page(sg); |
| 193 | int i; |
| 194 | |
| 195 | i = 0; |
| 196 | do { |
| 197 | unsigned int copy; |
| 198 | |
| 199 | if (!sglen) { |
| 200 | sg = sg_next(sg); |
| 201 | if (!sg) { |
| 202 | cxgb3i_log_error("%s, sg NULL, len %u/%u.\n", |
| 203 | __func__, datalen, dlen); |
| 204 | return -EINVAL; |
| 205 | } |
| 206 | sgoffset = 0; |
| 207 | sglen = sg->length; |
| 208 | page = sg_page(sg); |
| 209 | |
| 210 | } |
| 211 | copy = min(datalen, sglen); |
| 212 | if (i && page == frags[i - 1].page && |
| 213 | sgoffset + sg->offset == |
| 214 | frags[i - 1].page_offset + frags[i - 1].size) { |
| 215 | frags[i - 1].size += copy; |
| 216 | } else { |
| 217 | if (i >= frag_max) { |
| 218 | cxgb3i_log_error("%s, too many pages %u, " |
| 219 | "dlen %u.\n", __func__, |
| 220 | frag_max, dlen); |
| 221 | return -EINVAL; |
| 222 | } |
| 223 | |
| 224 | frags[i].page = page; |
| 225 | frags[i].page_offset = sg->offset + sgoffset; |
| 226 | frags[i].size = copy; |
| 227 | i++; |
| 228 | } |
| 229 | datalen -= copy; |
| 230 | sgoffset += copy; |
| 231 | sglen -= copy; |
| 232 | } while (datalen); |
| 233 | |
| 234 | return i; |
| 235 | } |
| 236 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 237 | int cxgb3i_conn_alloc_pdu(struct iscsi_task *task, u8 opcode) |
| 238 | { |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 239 | struct iscsi_conn *conn = task->conn; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 240 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 241 | struct cxgb3i_task_data *tdata = task->dd_data + sizeof(*tcp_task); |
| 242 | struct scsi_cmnd *sc = task->sc; |
| 243 | int headroom = SKB_TX_PDU_HEADER_LEN; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 244 | |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 245 | tcp_task->dd_data = tdata; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 246 | task->hdr = NULL; |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 247 | |
| 248 | /* write command, need to send data pdus */ |
| 249 | if (skb_extra_headroom && (opcode == ISCSI_OP_SCSI_DATA_OUT || |
| 250 | (opcode == ISCSI_OP_SCSI_CMD && |
| 251 | (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE)))) |
| 252 | headroom += min(skb_extra_headroom, conn->max_xmit_dlength); |
| 253 | |
| 254 | tdata->skb = alloc_skb(TX_HEADER_LEN + headroom, GFP_ATOMIC); |
| 255 | if (!tdata->skb) |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 256 | return -ENOMEM; |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 257 | skb_reserve(tdata->skb, TX_HEADER_LEN); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 258 | |
| 259 | cxgb3i_tx_debug("task 0x%p, opcode 0x%x, skb 0x%p.\n", |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 260 | task, opcode, tdata->skb); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 261 | |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 262 | task->hdr = (struct iscsi_hdr *)tdata->skb->data; |
| 263 | task->hdr_max = SKB_TX_PDU_HEADER_LEN; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 264 | |
| 265 | /* data_out uses scsi_cmd's itt */ |
| 266 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) |
| 267 | cxgb3i_reserve_itt(task, &task->hdr->itt); |
| 268 | |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | int cxgb3i_conn_init_pdu(struct iscsi_task *task, unsigned int offset, |
| 273 | unsigned int count) |
| 274 | { |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 275 | struct iscsi_conn *conn = task->conn; |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 276 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
| 277 | struct cxgb3i_task_data *tdata = tcp_task->dd_data; |
| 278 | struct sk_buff *skb = tdata->skb; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 279 | unsigned int datalen = count; |
| 280 | int i, padlen = iscsi_padding(count); |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 281 | struct page *pg; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 282 | |
| 283 | cxgb3i_tx_debug("task 0x%p,0x%p, offset %u, count %u, skb 0x%p.\n", |
| 284 | task, task->sc, offset, count, skb); |
| 285 | |
| 286 | skb_put(skb, task->hdr_len); |
| 287 | tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0); |
| 288 | if (!count) |
| 289 | return 0; |
| 290 | |
| 291 | if (task->sc) { |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 292 | struct scsi_data_buffer *sdb = scsi_out(task->sc); |
| 293 | struct scatterlist *sg = NULL; |
| 294 | int err; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 295 | |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 296 | tdata->offset = offset; |
| 297 | tdata->count = count; |
| 298 | err = sgl_seek_offset(sdb->table.sgl, sdb->table.nents, |
| 299 | tdata->offset, &tdata->sgoffset, &sg); |
| 300 | if (err < 0) { |
| 301 | cxgb3i_log_warn("tpdu, sgl %u, bad offset %u/%u.\n", |
| 302 | sdb->table.nents, tdata->offset, |
| 303 | sdb->length); |
| 304 | return err; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 305 | } |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 306 | err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count, |
| 307 | tdata->frags, MAX_PDU_FRAGS); |
| 308 | if (err < 0) { |
| 309 | cxgb3i_log_warn("tpdu, sgl %u, bad offset %u + %u.\n", |
| 310 | sdb->table.nents, tdata->offset, |
| 311 | tdata->count); |
| 312 | return err; |
| 313 | } |
| 314 | tdata->nr_frags = err; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 315 | |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 316 | if (tdata->nr_frags > MAX_SKB_FRAGS || |
| 317 | (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) { |
| 318 | char *dst = skb->data + task->hdr_len; |
| 319 | skb_frag_t *frag = tdata->frags; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 320 | |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 321 | /* data fits in the skb's headroom */ |
| 322 | for (i = 0; i < tdata->nr_frags; i++, frag++) { |
| 323 | char *src = kmap_atomic(frag->page, |
| 324 | KM_SOFTIRQ0); |
| 325 | |
| 326 | memcpy(dst, src+frag->page_offset, frag->size); |
| 327 | dst += frag->size; |
| 328 | kunmap_atomic(src, KM_SOFTIRQ0); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 329 | } |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 330 | if (padlen) { |
| 331 | memset(dst, 0, padlen); |
| 332 | padlen = 0; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 333 | } |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 334 | skb_put(skb, count + padlen); |
| 335 | } else { |
| 336 | /* data fit into frag_list */ |
| 337 | for (i = 0; i < tdata->nr_frags; i++) |
| 338 | get_page(tdata->frags[i].page); |
| 339 | |
| 340 | memcpy(skb_shinfo(skb)->frags, tdata->frags, |
| 341 | sizeof(skb_frag_t) * tdata->nr_frags); |
| 342 | skb_shinfo(skb)->nr_frags = tdata->nr_frags; |
| 343 | skb->len += count; |
| 344 | skb->data_len += count; |
| 345 | skb->truesize += count; |
| 346 | } |
| 347 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 348 | } else { |
| 349 | pg = virt_to_page(task->data); |
| 350 | |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 351 | get_page(pg); |
| 352 | skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data), |
| 353 | count); |
| 354 | skb->len += count; |
| 355 | skb->data_len += count; |
| 356 | skb->truesize += count; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | if (padlen) { |
| 360 | i = skb_shinfo(skb)->nr_frags; |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 361 | get_page(pad_page); |
| 362 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, pad_page, 0, |
| 363 | padlen); |
| 364 | |
| 365 | skb->data_len += padlen; |
| 366 | skb->truesize += padlen; |
| 367 | skb->len += padlen; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 368 | } |
| 369 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | int cxgb3i_conn_xmit_pdu(struct iscsi_task *task) |
| 374 | { |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 375 | struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; |
| 376 | struct cxgb3i_conn *cconn = tcp_conn->dd_data; |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 377 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
| 378 | struct cxgb3i_task_data *tdata = tcp_task->dd_data; |
| 379 | struct sk_buff *skb = tdata->skb; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 380 | unsigned int datalen; |
| 381 | int err; |
| 382 | |
| 383 | if (!skb) |
| 384 | return 0; |
| 385 | |
| 386 | datalen = skb->data_len; |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 387 | tdata->skb = NULL; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 388 | err = cxgb3i_c3cn_send_pdus(cconn->cep->c3cn, skb); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 389 | if (err > 0) { |
| 390 | int pdulen = err; |
| 391 | |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 392 | cxgb3i_tx_debug("task 0x%p, skb 0x%p, len %u/%u, rv %d.\n", |
| 393 | task, skb, skb->len, skb->data_len, err); |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 394 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 395 | if (task->conn->hdrdgst_en) |
| 396 | pdulen += ISCSI_DIGEST_SIZE; |
| 397 | if (datalen && task->conn->datadgst_en) |
| 398 | pdulen += ISCSI_DIGEST_SIZE; |
| 399 | |
| 400 | task->conn->txdata_octets += pdulen; |
| 401 | return 0; |
| 402 | } |
| 403 | |
Mike Christie | 1393109 | 2009-04-21 15:32:34 -0500 | [diff] [blame] | 404 | if (err == -EAGAIN || err == -ENOBUFS) { |
| 405 | /* reset skb to send when we are called again */ |
| 406 | tdata->skb = skb; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 407 | return err; |
| 408 | } |
Mike Christie | 1393109 | 2009-04-21 15:32:34 -0500 | [diff] [blame] | 409 | |
| 410 | kfree_skb(skb); |
| 411 | cxgb3i_tx_debug("itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n", |
| 412 | task->itt, skb, skb->len, skb->data_len, err); |
| 413 | iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err); |
| 414 | iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED); |
| 415 | return err; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 416 | } |
| 417 | |
| 418 | int cxgb3i_pdu_init(void) |
| 419 | { |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 420 | if (SKB_TX_HEADROOM > (512 * MAX_SKB_FRAGS)) |
| 421 | skb_extra_headroom = SKB_TX_HEADROOM; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 422 | pad_page = alloc_page(GFP_KERNEL); |
| 423 | if (!pad_page) |
| 424 | return -ENOMEM; |
| 425 | memset(page_address(pad_page), 0, PAGE_SIZE); |
| 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | void cxgb3i_pdu_cleanup(void) |
| 430 | { |
| 431 | if (pad_page) { |
| 432 | __free_page(pad_page); |
| 433 | pad_page = NULL; |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn) |
| 438 | { |
| 439 | struct sk_buff *skb; |
| 440 | unsigned int read = 0; |
| 441 | struct iscsi_conn *conn = c3cn->user_data; |
| 442 | int err = 0; |
| 443 | |
| 444 | cxgb3i_rx_debug("cn 0x%p.\n", c3cn); |
| 445 | |
| 446 | read_lock(&c3cn->callback_lock); |
| 447 | if (unlikely(!conn || conn->suspend_rx)) { |
| 448 | cxgb3i_rx_debug("conn 0x%p, id %d, suspend_rx %lu!\n", |
| 449 | conn, conn ? conn->id : 0xFF, |
| 450 | conn ? conn->suspend_rx : 0xFF); |
| 451 | read_unlock(&c3cn->callback_lock); |
| 452 | return; |
| 453 | } |
| 454 | skb = skb_peek(&c3cn->receive_queue); |
| 455 | while (!err && skb) { |
| 456 | __skb_unlink(skb, &c3cn->receive_queue); |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 457 | read += skb_rx_pdulen(skb); |
| 458 | cxgb3i_rx_debug("conn 0x%p, cn 0x%p, rx skb 0x%p, pdulen %u.\n", |
| 459 | conn, c3cn, skb, skb_rx_pdulen(skb)); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 460 | err = cxgb3i_conn_read_pdu_skb(conn, skb); |
| 461 | __kfree_skb(skb); |
| 462 | skb = skb_peek(&c3cn->receive_queue); |
| 463 | } |
| 464 | read_unlock(&c3cn->callback_lock); |
Jiri Slaby | 0ed8570 | 2009-12-21 16:27:55 -0800 | [diff] [blame] | 465 | c3cn->copied_seq += read; |
| 466 | cxgb3i_c3cn_rx_credits(c3cn, read); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 467 | conn->rxdata_octets += read; |
Karen Xie | f62d089 | 2009-02-13 21:38:54 -0800 | [diff] [blame] | 468 | |
| 469 | if (err) { |
| 470 | cxgb3i_log_info("conn 0x%p rx failed err %d.\n", conn, err); |
| 471 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| 472 | } |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | void cxgb3i_conn_tx_open(struct s3_conn *c3cn) |
| 476 | { |
| 477 | struct iscsi_conn *conn = c3cn->user_data; |
| 478 | |
| 479 | cxgb3i_tx_debug("cn 0x%p.\n", c3cn); |
| 480 | if (conn) { |
| 481 | cxgb3i_tx_debug("cn 0x%p, cid %d.\n", c3cn, conn->id); |
Mike Christie | 32ae763 | 2009-03-05 14:46:03 -0600 | [diff] [blame] | 482 | iscsi_conn_queue_work(conn); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 483 | } |
| 484 | } |
| 485 | |
| 486 | void cxgb3i_conn_closing(struct s3_conn *c3cn) |
| 487 | { |
| 488 | struct iscsi_conn *conn; |
| 489 | |
| 490 | read_lock(&c3cn->callback_lock); |
| 491 | conn = c3cn->user_data; |
| 492 | if (conn && c3cn->state != C3CN_STATE_ESTABLISHED) |
| 493 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| 494 | read_unlock(&c3cn->callback_lock); |
| 495 | } |