| /* |
| * iSCSI Initiator over TCP/IP Data-Path |
| * |
| * Copyright (C) 2004 Dmitry Yusupov |
| * Copyright (C) 2004 Alex Aizman |
| * Copyright (C) 2005 - 2006 Mike Christie |
| * Copyright (C) 2006 Red Hat, Inc. All rights reserved. |
| * maintained by open-iscsi@googlegroups.com |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published |
| * by the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * See the file COPYING included with this distribution for more details. |
| * |
| * Credits: |
| * Christoph Hellwig |
| * FUJITA Tomonori |
| * Arne Redlich |
| * Zhenyu Wang |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/list.h> |
| #include <linux/inet.h> |
| #include <linux/blkdev.h> |
| #include <linux/crypto.h> |
| #include <linux/delay.h> |
| #include <linux/kfifo.h> |
| #include <linux/scatterlist.h> |
| #include <linux/mutex.h> |
| #include <net/tcp.h> |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_transport_iscsi.h> |
| |
| #include "iscsi_tcp.h" |
| |
| MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, " |
| "Alex Aizman <itn780@yahoo.com>"); |
| MODULE_DESCRIPTION("iSCSI/TCP data-path"); |
| MODULE_LICENSE("GPL"); |
| /* #define DEBUG_TCP */ |
| #define DEBUG_ASSERT |
| |
| #ifdef DEBUG_TCP |
| #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) |
| #else |
| #define debug_tcp(fmt...) |
| #endif |
| |
| #ifndef DEBUG_ASSERT |
| #ifdef BUG_ON |
| #undef BUG_ON |
| #endif |
| #define BUG_ON(expr) |
| #endif |
| |
| static unsigned int iscsi_max_lun = 512; |
| module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); |
| |
| static inline void |
| iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size) |
| { |
| ibuf->sg.page = virt_to_page(vbuf); |
| ibuf->sg.offset = offset_in_page(vbuf); |
| ibuf->sg.length = size; |
| ibuf->sent = 0; |
| ibuf->use_sendmsg = 1; |
| } |
| |
| static inline void |
| iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg) |
| { |
| ibuf->sg.page = sg->page; |
| ibuf->sg.offset = sg->offset; |
| ibuf->sg.length = sg->length; |
| /* |
| * Fastpath: sg element fits into single page |
| */ |
| if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page)) |
| ibuf->use_sendmsg = 0; |
| else |
| ibuf->use_sendmsg = 1; |
| ibuf->sent = 0; |
| } |
| |
| static inline int |
| iscsi_buf_left(struct iscsi_buf *ibuf) |
| { |
| int rc; |
| |
| rc = ibuf->sg.length - ibuf->sent; |
| BUG_ON(rc < 0); |
| return rc; |
| } |
| |
| static inline void |
| iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, |
| u8* crc) |
| { |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| |
| crypto_hash_digest(&tcp_conn->tx_hash, &buf->sg, buf->sg.length, crc); |
| buf->sg.length = tcp_conn->hdr_size; |
| } |
| |
| static inline int |
| iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn) |
| { |
| struct sk_buff *skb = tcp_conn->in.skb; |
| |
| tcp_conn->in.zero_copy_hdr = 0; |
| |
| if (tcp_conn->in.copy >= tcp_conn->hdr_size && |
| tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) { |
| /* |
| * Zero-copy PDU Header: using connection context |
| * to store header pointer. |
| */ |
| if (skb_shinfo(skb)->frag_list == NULL && |
| !skb_shinfo(skb)->nr_frags) { |
| tcp_conn->in.hdr = (struct iscsi_hdr *) |
| ((char*)skb->data + tcp_conn->in.offset); |
| tcp_conn->in.zero_copy_hdr = 1; |
| } else { |
| /* ignoring return code since we checked |
| * in.copy before */ |
| skb_copy_bits(skb, tcp_conn->in.offset, |
| &tcp_conn->hdr, tcp_conn->hdr_size); |
| tcp_conn->in.hdr = &tcp_conn->hdr; |
| } |
| tcp_conn->in.offset += tcp_conn->hdr_size; |
| tcp_conn->in.copy -= tcp_conn->hdr_size; |
| } else { |
| int hdr_remains; |
| int copylen; |
| |
| /* |
| * PDU header scattered across SKB's, |
| * copying it... This'll happen quite rarely. |
| */ |
| |
| if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) |
| tcp_conn->in.hdr_offset = 0; |
| |
| hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset; |
| BUG_ON(hdr_remains <= 0); |
| |
| copylen = min(tcp_conn->in.copy, hdr_remains); |
| skb_copy_bits(skb, tcp_conn->in.offset, |
| (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset, |
| copylen); |
| |
| debug_tcp("PDU gather offset %d bytes %d in.offset %d " |
| "in.copy %d\n", tcp_conn->in.hdr_offset, copylen, |
| tcp_conn->in.offset, tcp_conn->in.copy); |
| |
| tcp_conn->in.offset += copylen; |
| tcp_conn->in.copy -= copylen; |
| if (copylen < hdr_remains) { |
| tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER; |
| tcp_conn->in.hdr_offset += copylen; |
| return -EAGAIN; |
| } |
| tcp_conn->in.hdr = &tcp_conn->hdr; |
| tcp_conn->discontiguous_hdr_cnt++; |
| tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * must be called with session lock |
| */ |
| static void |
| iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| { |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| struct iscsi_r2t_info *r2t; |
| struct scsi_cmnd *sc; |
| |
| /* flush ctask's r2t queues */ |
| while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { |
| __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, |
| sizeof(void*)); |
| debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n"); |
| } |
| |
| sc = ctask->sc; |
| if (unlikely(!sc)) |
| return; |
| |
| tcp_ctask->xmstate = XMSTATE_IDLE; |
| tcp_ctask->r2t = NULL; |
| } |
| |
| /** |
| * iscsi_data_rsp - SCSI Data-In Response processing |
| * @conn: iscsi connection |
| * @ctask: scsi command task |
| **/ |
| static int |
| iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| { |
| int rc; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; |
| struct iscsi_session *session = conn->session; |
| int datasn = be32_to_cpu(rhdr->datasn); |
| |
| rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); |
| if (rc) |
| return rc; |
| /* |
| * setup Data-In byte counter (gets decremented..) |
| */ |
| ctask->data_count = tcp_conn->in.datalen; |
| |
| if (tcp_conn->in.datalen == 0) |
| return 0; |
| |
| if (ctask->datasn != datasn) |
| return ISCSI_ERR_DATASN; |
| |
| ctask->datasn++; |
| |
| tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); |
| if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length) |
| return ISCSI_ERR_DATA_OFFSET; |
| |
| if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { |
| struct scsi_cmnd *sc = ctask->sc; |
| |
| conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
| if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) { |
| int res_count = be32_to_cpu(rhdr->residual_count); |
| |
| if (res_count > 0 && |
| res_count <= sc->request_bufflen) { |
| sc->resid = res_count; |
| sc->result = (DID_OK << 16) | rhdr->cmd_status; |
| } else |
| sc->result = (DID_BAD_TARGET << 16) | |
| rhdr->cmd_status; |
| } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) { |
| sc->resid = be32_to_cpu(rhdr->residual_count); |
| sc->result = (DID_OK << 16) | rhdr->cmd_status; |
| } else |
| sc->result = (DID_OK << 16) | rhdr->cmd_status; |
| } |
| |
| conn->datain_pdus_cnt++; |
| return 0; |
| } |
| |
| /** |
| * iscsi_solicit_data_init - initialize first Data-Out |
| * @conn: iscsi connection |
| * @ctask: scsi command task |
| * @r2t: R2T info |
| * |
| * Notes: |
| * Initialize first Data-Out within this R2T sequence and finds |
| * proper data_offset within this SCSI command. |
| * |
| * This function is called with connection lock taken. |
| **/ |
| static void |
| iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
| struct iscsi_r2t_info *r2t) |
| { |
| struct iscsi_data *hdr; |
| struct scsi_cmnd *sc = ctask->sc; |
| |
| hdr = &r2t->dtask.hdr; |
| memset(hdr, 0, sizeof(struct iscsi_data)); |
| hdr->ttt = r2t->ttt; |
| hdr->datasn = cpu_to_be32(r2t->solicit_datasn); |
| r2t->solicit_datasn++; |
| hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
| memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
| hdr->itt = ctask->hdr->itt; |
| hdr->exp_statsn = r2t->exp_statsn; |
| hdr->offset = cpu_to_be32(r2t->data_offset); |
| if (r2t->data_length > conn->max_xmit_dlength) { |
| hton24(hdr->dlength, conn->max_xmit_dlength); |
| r2t->data_count = conn->max_xmit_dlength; |
| hdr->flags = 0; |
| } else { |
| hton24(hdr->dlength, r2t->data_length); |
| r2t->data_count = r2t->data_length; |
| hdr->flags = ISCSI_FLAG_CMD_FINAL; |
| } |
| conn->dataout_pdus_cnt++; |
| |
| r2t->sent = 0; |
| |
| iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
| sizeof(struct iscsi_hdr)); |
| |
| if (sc->use_sg) { |
| int i, sg_count = 0; |
| struct scatterlist *sg = sc->request_buffer; |
| |
| r2t->sg = NULL; |
| for (i = 0; i < sc->use_sg; i++, sg += 1) { |
| /* FIXME: prefetch ? */ |
| if (sg_count + sg->length > r2t->data_offset) { |
| int page_offset; |
| |
| /* sg page found! */ |
| |
| /* offset within this page */ |
| page_offset = r2t->data_offset - sg_count; |
| |
| /* fill in this buffer */ |
| iscsi_buf_init_sg(&r2t->sendbuf, sg); |
| r2t->sendbuf.sg.offset += page_offset; |
| r2t->sendbuf.sg.length -= page_offset; |
| |
| /* xmit logic will continue with next one */ |
| r2t->sg = sg + 1; |
| break; |
| } |
| sg_count += sg->length; |
| } |
| BUG_ON(r2t->sg == NULL); |
| } else { |
| iscsi_buf_init_iov(&r2t->sendbuf, |
| (char*)sc->request_buffer + r2t->data_offset, |
| r2t->data_count); |
| r2t->sg = NULL; |
| } |
| } |
| |
| /** |
| * iscsi_r2t_rsp - iSCSI R2T Response processing |
| * @conn: iscsi connection |
| * @ctask: scsi command task |
| **/ |
| static int |
| iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| { |
| struct iscsi_r2t_info *r2t; |
| struct iscsi_session *session = conn->session; |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; |
| int r2tsn = be32_to_cpu(rhdr->r2tsn); |
| int rc; |
| |
| if (tcp_conn->in.datalen) { |
| printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n", |
| tcp_conn->in.datalen); |
| return ISCSI_ERR_DATALEN; |
| } |
| |
| if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn) |
| return ISCSI_ERR_R2TSN; |
| |
| rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); |
| if (rc) |
| return rc; |
| |
| /* FIXME: use R2TSN to detect missing R2T */ |
| |
| /* fill-in new R2T associated with the task */ |
| spin_lock(&session->lock); |
| if (!ctask->sc || ctask->mtask || |
| session->state != ISCSI_STATE_LOGGED_IN) { |
| printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " |
| "recovery...\n", ctask->itt); |
| spin_unlock(&session->lock); |
| return 0; |
| } |
| |
| rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
| BUG_ON(!rc); |
| |
| r2t->exp_statsn = rhdr->statsn; |
| r2t->data_length = be32_to_cpu(rhdr->data_length); |
| if (r2t->data_length == 0) { |
| printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n"); |
| spin_unlock(&session->lock); |
| return ISCSI_ERR_DATALEN; |
| } |
| |
| if (r2t->data_length > session->max_burst) |
| debug_scsi("invalid R2T with data len %u and max burst %u." |
| "Attempting to execute request.\n", |
| r2t->data_length, session->max_burst); |
| |
| r2t->data_offset = be32_to_cpu(rhdr->data_offset); |
| if (r2t->data_offset + r2t->data_length > ctask->total_length) { |
| spin_unlock(&session->lock); |
| printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at " |
| "offset %u and total length %d\n", r2t->data_length, |
| r2t->data_offset, ctask->total_length); |
| return ISCSI_ERR_DATALEN; |
| } |
| |
| r2t->ttt = rhdr->ttt; /* no flip */ |
| r2t->solicit_datasn = 0; |
| |
| iscsi_solicit_data_init(conn, ctask, r2t); |
| |
| tcp_ctask->exp_r2tsn = r2tsn + 1; |
| tcp_ctask->xmstate |= XMSTATE_SOL_HDR; |
| __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); |
| list_move_tail(&ctask->running, &conn->xmitqueue); |
| |
| scsi_queue_work(session->host, &conn->xmitwork); |
| conn->r2t_pdus_cnt++; |
| spin_unlock(&session->lock); |
| |
| return 0; |
| } |
| |
| static int |
| iscsi_tcp_hdr_recv(struct iscsi_conn *conn) |
| { |
| int rc = 0, opcode, ahslen; |
| struct iscsi_hdr *hdr; |
| struct iscsi_session *session = conn->session; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| uint32_t cdgst, rdgst = 0, itt; |
| |
| hdr = tcp_conn->in.hdr; |
| |
| /* verify PDU length */ |
| tcp_conn->in.datalen = ntoh24(hdr->dlength); |
| if (tcp_conn->in.datalen > conn->max_recv_dlength) { |
| printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", |
| tcp_conn->in.datalen, conn->max_recv_dlength); |
| return ISCSI_ERR_DATALEN; |
| } |
| tcp_conn->data_copied = 0; |
| |
| /* read AHS */ |
| ahslen = hdr->hlength << 2; |
| tcp_conn->in.offset += ahslen; |
| tcp_conn->in.copy -= ahslen; |
| if (tcp_conn->in.copy < 0) { |
| printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " |
| "%d bytes\n", ahslen); |
| return ISCSI_ERR_AHSLEN; |
| } |
| |
| /* calculate read padding */ |
| tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1); |
| if (tcp_conn->in.padding) { |
| tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding; |
| debug_scsi("read padding %d bytes\n", tcp_conn->in.padding); |
| } |
| |
| if (conn->hdrdgst_en) { |
| struct scatterlist sg; |
| |
| sg_init_one(&sg, (u8 *)hdr, |
| sizeof(struct iscsi_hdr) + ahslen); |
| crypto_hash_digest(&tcp_conn->rx_hash, &sg, sg.length, |
| (u8 *)&cdgst); |
| rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + |
| ahslen); |
| if (cdgst != rdgst) { |
| printk(KERN_ERR "iscsi_tcp: hdrdgst error " |
| "recv 0x%x calc 0x%x\n", rdgst, cdgst); |
| return ISCSI_ERR_HDR_DGST; |
| } |
| } |
| |
| opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
| /* verify itt (itt encoding: age+cid+itt) */ |
| rc = iscsi_verify_itt(conn, hdr, &itt); |
| if (rc == ISCSI_ERR_NO_SCSI_CMD) { |
| tcp_conn->in.datalen = 0; /* force drop */ |
| return 0; |
| } else if (rc) |
| return rc; |
| |
| debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", |
| opcode, tcp_conn->in.offset, tcp_conn->in.copy, |
| ahslen, tcp_conn->in.datalen); |
| |
| switch(opcode) { |
| case ISCSI_OP_SCSI_DATA_IN: |
| tcp_conn->in.ctask = session->cmds[itt]; |
| rc = iscsi_data_rsp(conn, tcp_conn->in.ctask); |
| if (rc) |
| return rc; |
| /* fall through */ |
| case ISCSI_OP_SCSI_CMD_RSP: |
| tcp_conn->in.ctask = session->cmds[itt]; |
| if (tcp_conn->in.datalen) |
| goto copy_hdr; |
| |
| spin_lock(&session->lock); |
| rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); |
| spin_unlock(&session->lock); |
| break; |
| case ISCSI_OP_R2T: |
| tcp_conn->in.ctask = session->cmds[itt]; |
| if (ahslen) |
| rc = ISCSI_ERR_AHSLEN; |
| else if (tcp_conn->in.ctask->sc->sc_data_direction == |
| DMA_TO_DEVICE) |
| rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); |
| else |
| rc = ISCSI_ERR_PROTO; |
| break; |
| case ISCSI_OP_LOGIN_RSP: |
| case ISCSI_OP_TEXT_RSP: |
| case ISCSI_OP_REJECT: |
| case ISCSI_OP_ASYNC_EVENT: |
| /* |
| * It is possible that we could get a PDU with a buffer larger |
| * than 8K, but there are no targets that currently do this. |
| * For now we fail until we find a vendor that needs it |
| */ |
| if (DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH < |
| tcp_conn->in.datalen) { |
| printk(KERN_ERR "iscsi_tcp: received buffer of len %u " |
| "but conn buffer is only %u (opcode %0x)\n", |
| tcp_conn->in.datalen, |
| DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, opcode); |
| rc = ISCSI_ERR_PROTO; |
| break; |
| } |
| |
| if (tcp_conn->in.datalen) |
| goto copy_hdr; |
| /* fall through */ |
| case ISCSI_OP_LOGOUT_RSP: |
| case ISCSI_OP_NOOP_IN: |
| case ISCSI_OP_SCSI_TMFUNC_RSP: |
| rc = iscsi_complete_pdu(conn, hdr, NULL, 0); |
| break; |
| default: |
| rc = ISCSI_ERR_BAD_OPCODE; |
| break; |
| } |
| |
| return rc; |
| |
| copy_hdr: |
| /* |
| * if we did zero copy for the header but we will need multiple |
| * skbs to complete the command then we have to copy the header |
| * for later use |
| */ |
| if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <= |
| (tcp_conn->in.datalen + tcp_conn->in.padding + |
| (conn->datadgst_en ? 4 : 0))) { |
| debug_tcp("Copying header for later use. in.copy %d in.datalen" |
| " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); |
| memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, |
| sizeof(struct iscsi_hdr)); |
| tcp_conn->in.hdr = &tcp_conn->hdr; |
| tcp_conn->in.zero_copy_hdr = 0; |
| } |
| return 0; |
| } |
| |
| /** |
| * iscsi_ctask_copy - copy skb bits to the destanation cmd task |
| * @conn: iscsi tcp connection |
| * @ctask: scsi command task |
| * @buf: buffer to copy to |
| * @buf_size: size of buffer |
| * @offset: offset within the buffer |
| * |
| * Notes: |
| * The function calls skb_copy_bits() and updates per-connection and |
| * per-cmd byte counters. |
| * |
| * Read counters (in bytes): |
| * |
| * conn->in.offset offset within in progress SKB |
| * conn->in.copy left to copy from in progress SKB |
| * including padding |
| * conn->in.copied copied already from in progress SKB |
| * conn->data_copied copied already from in progress buffer |
| * ctask->sent total bytes sent up to the MidLayer |
| * ctask->data_count left to copy from in progress Data-In |
| * buf_left left to copy from in progress buffer |
| **/ |
| static inline int |
| iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, |
| void *buf, int buf_size, int offset) |
| { |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| int buf_left = buf_size - (tcp_conn->data_copied + offset); |
| int size = min(tcp_conn->in.copy, buf_left); |
| int rc; |
| |
| size = min(size, ctask->data_count); |
| |
| debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", |
| size, tcp_conn->in.offset, tcp_conn->in.copied); |
| |
| BUG_ON(size <= 0); |
| BUG_ON(tcp_ctask->sent + size > ctask->total_length); |
| |
| rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
| (char*)buf + (offset + tcp_conn->data_copied), size); |
| /* must fit into skb->len */ |
| BUG_ON(rc); |
| |
| tcp_conn->in.offset += size; |
| tcp_conn->in.copy -= size; |
| tcp_conn->in.copied += size; |
| tcp_conn->data_copied += size; |
| tcp_ctask->sent += size; |
| ctask->data_count -= size; |
| |
| BUG_ON(tcp_conn->in.copy < 0); |
| BUG_ON(ctask->data_count < 0); |
| |
| if (buf_size != (tcp_conn->data_copied + offset)) { |
| if (!ctask->data_count) { |
| BUG_ON(buf_size - tcp_conn->data_copied < 0); |
| /* done with this PDU */ |
| return buf_size - tcp_conn->data_copied; |
| } |
| return -EAGAIN; |
| } |
| |
| /* done with this buffer or with both - PDU and buffer */ |
| tcp_conn->data_copied = 0; |
| return 0; |
| } |
| |
| /** |
| * iscsi_tcp_copy - copy skb bits to the destanation buffer |
| * @conn: iscsi tcp connection |
| * |
| * Notes: |
| * The function calls skb_copy_bits() and updates per-connection |
| * byte counters. |
| **/ |
| static inline int |
| iscsi_tcp_copy(struct iscsi_conn *conn, int buf_size) |
| { |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| int buf_left = buf_size - tcp_conn->data_copied; |
| int size = min(tcp_conn->in.copy, buf_left); |
| int rc; |
| |
| debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", |
| size, tcp_conn->in.offset, tcp_conn->data_copied); |
| BUG_ON(size <= 0); |
| |
| rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
| (char*)conn->data + tcp_conn->data_copied, size); |
| BUG_ON(rc); |
| |
| tcp_conn->in.offset += size; |
| tcp_conn->in.copy -= size; |
| tcp_conn->in.copied += size; |
| tcp_conn->data_copied += size; |
| |
| if (buf_size != tcp_conn->data_copied) |
| return -EAGAIN; |
| |
| return 0; |
| } |
| |
| static inline void |
| partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg, |
| int offset, int length) |
| { |
| struct scatterlist temp; |
| |
| memcpy(&temp, sg, sizeof(struct scatterlist)); |
| temp.offset = offset; |
| temp.length = length; |
| crypto_hash_update(desc, &temp, length); |
| } |
| |
| static void |
| iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) |
| { |
| struct scatterlist tmp; |
| |
| sg_init_one(&tmp, buf, len); |
| crypto_hash_update(&tcp_conn->rx_hash, &tmp, len); |
| } |
| |
| static int iscsi_scsi_data_in(struct iscsi_conn *conn) |
| { |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| struct scsi_cmnd *sc = ctask->sc; |
| struct scatterlist *sg; |
| int i, offset, rc = 0; |
| |
| BUG_ON((void*)ctask != sc->SCp.ptr); |
| |
| /* |
| * copying Data-In into the Scsi_Cmnd |
| */ |
| if (!sc->use_sg) { |
| i = ctask->data_count; |
| rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, |
| sc->request_bufflen, |
| tcp_ctask->data_offset); |
| if (rc == -EAGAIN) |
| return rc; |
| if (conn->datadgst_en) |
| iscsi_recv_digest_update(tcp_conn, sc->request_buffer, |
| i); |
| rc = 0; |
| goto done; |
| } |
| |
| offset = tcp_ctask->data_offset; |
| sg = sc->request_buffer; |
| |
| if (tcp_ctask->data_offset) |
| for (i = 0; i < tcp_ctask->sg_count; i++) |
| offset -= sg[i].length; |
| /* we've passed through partial sg*/ |
| if (offset < 0) |
| offset = 0; |
| |
| for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { |
| char *dest; |
| |
| dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); |
| rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, |
| sg[i].length, offset); |
| kunmap_atomic(dest, KM_SOFTIRQ0); |
| if (rc == -EAGAIN) |
| /* continue with the next SKB/PDU */ |
| return rc; |
| if (!rc) { |
| if (conn->datadgst_en) { |
| if (!offset) |
| crypto_hash_update( |
| &tcp_conn->rx_hash, |
| &sg[i], 1); |
| else |
| partial_sg_digest_update( |
| &tcp_conn->rx_hash, |
| &sg[i], |
| sg[i].offset + offset, |
| sg[i].length - offset); |
| } |
| offset = 0; |
| tcp_ctask->sg_count++; |
| } |
| |
| if (!ctask->data_count) { |
| if (rc && conn->datadgst_en) |
| /* |
| * data-in is complete, but buffer not... |
| */ |
| partial_sg_digest_update(&tcp_conn->rx_hash, |
| &sg[i], |
| sg[i].offset, |
| sg[i].length-rc); |
| rc = 0; |
| break; |
| } |
| |
| if (!tcp_conn->in.copy) |
| return -EAGAIN; |
| } |
| BUG_ON(ctask->data_count); |
| |
| done: |
| /* check for non-exceptional status */ |
| if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { |
| debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n", |
| (long)sc, sc->result, ctask->itt, |
| tcp_conn->in.hdr->flags); |
| spin_lock(&conn->session->lock); |
| __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); |
| spin_unlock(&conn->session->lock); |
| } |
| |
| return rc; |
| } |
| |
| static int |
| iscsi_data_recv(struct iscsi_conn *conn) |
| { |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| int rc = 0, opcode; |
| |
| opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
| switch (opcode) { |
| case ISCSI_OP_SCSI_DATA_IN: |
| rc = iscsi_scsi_data_in(conn); |
| break; |
| case ISCSI_OP_SCSI_CMD_RSP: |
| case ISCSI_OP_TEXT_RSP: |
| case ISCSI_OP_LOGIN_RSP: |
| case ISCSI_OP_ASYNC_EVENT: |
| case ISCSI_OP_REJECT: |
| /* |
| * Collect data segment to the connection's data |
| * placeholder |
| */ |
| if (iscsi_tcp_copy(conn, tcp_conn->in.datalen)) { |
| rc = -EAGAIN; |
| goto exit; |
| } |
| |
| rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data, |
| tcp_conn->in.datalen); |
| if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) |
| iscsi_recv_digest_update(tcp_conn, conn->data, |
| tcp_conn->in.datalen); |
| break; |
| default: |
| BUG_ON(1); |
| } |
| exit: |
| return rc; |
| } |
| |
| /** |
| * iscsi_tcp_data_recv - TCP receive in sendfile fashion |
| * @rd_desc: read descriptor |
| * @skb: socket buffer |
| * @offset: offset in skb |
| * @len: skb->len - offset |
| **/ |
| static int |
| iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, |
| unsigned int offset, size_t len) |
| { |
| int rc; |
| struct iscsi_conn *conn = rd_desc->arg.data; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| int processed; |
| char pad[ISCSI_PAD_LEN]; |
| struct scatterlist sg; |
| |
| /* |
| * Save current SKB and its offset in the corresponding |
| * connection context. |
| */ |
| tcp_conn->in.copy = skb->len - offset; |
| tcp_conn->in.offset = offset; |
| tcp_conn->in.skb = skb; |
| tcp_conn->in.len = tcp_conn->in.copy; |
| BUG_ON(tcp_conn->in.copy <= 0); |
| debug_tcp("in %d bytes\n", tcp_conn->in.copy); |
| |
| more: |
| tcp_conn->in.copied = 0; |
| rc = 0; |
| |
| if (unlikely(conn->suspend_rx)) { |
| debug_tcp("conn %d Rx suspended!\n", conn->id); |
| return 0; |
| } |
| |
| if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || |
| tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { |
| rc = iscsi_hdr_extract(tcp_conn); |
| if (rc) { |
| if (rc == -EAGAIN) |
| goto nomore; |
| else { |
| iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| return 0; |
| } |
| } |
| |
| /* |
| * Verify and process incoming PDU header. |
| */ |
| rc = iscsi_tcp_hdr_recv(conn); |
| if (!rc && tcp_conn->in.datalen) { |
| if (conn->datadgst_en) |
| crypto_hash_init(&tcp_conn->rx_hash); |
| tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; |
| } else if (rc) { |
| iscsi_conn_failure(conn, rc); |
| return 0; |
| } |
| } |
| |
| if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { |
| uint32_t recv_digest; |
| |
| debug_tcp("extra data_recv offset %d copy %d\n", |
| tcp_conn->in.offset, tcp_conn->in.copy); |
| rc = iscsi_tcp_copy(conn, sizeof(uint32_t)); |
| if (rc) { |
| if (rc == -EAGAIN) |
| goto again; |
| iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| return 0; |
| } |
| |
| memcpy(&recv_digest, conn->data, sizeof(uint32_t)); |
| if (recv_digest != tcp_conn->in.datadgst) { |
| debug_tcp("iscsi_tcp: data digest error!" |
| "0x%x != 0x%x\n", recv_digest, |
| tcp_conn->in.datadgst); |
| iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
| return 0; |
| } else { |
| debug_tcp("iscsi_tcp: data digest match!" |
| "0x%x == 0x%x\n", recv_digest, |
| tcp_conn->in.datadgst); |
| tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
| } |
| } |
| |
| if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && |
| tcp_conn->in.copy) { |
| |
| debug_tcp("data_recv offset %d copy %d\n", |
| tcp_conn->in.offset, tcp_conn->in.copy); |
| |
| rc = iscsi_data_recv(conn); |
| if (rc) { |
| if (rc == -EAGAIN) |
| goto again; |
| iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| return 0; |
| } |
| tcp_conn->in.copy -= tcp_conn->in.padding; |
| tcp_conn->in.offset += tcp_conn->in.padding; |
| if (conn->datadgst_en) { |
| if (tcp_conn->in.padding) { |
| debug_tcp("padding -> %d\n", |
| tcp_conn->in.padding); |
| memset(pad, 0, tcp_conn->in.padding); |
| sg_init_one(&sg, pad, tcp_conn->in.padding); |
| crypto_hash_update(&tcp_conn->rx_hash, |
| &sg, sg.length); |
| } |
| crypto_hash_final(&tcp_conn->rx_hash, |
| (u8 *) &tcp_conn->in.datadgst); |
| debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); |
| tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; |
| tcp_conn->data_copied = 0; |
| } else |
| tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
| } |
| |
| debug_tcp("f, processed %d from out of %d padding %d\n", |
| tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); |
| BUG_ON(tcp_conn->in.offset - offset > len); |
| |
| if (tcp_conn->in.offset - offset != len) { |
| debug_tcp("continue to process %d bytes\n", |
| (int)len - (tcp_conn->in.offset - offset)); |
| goto more; |
| } |
| |
| nomore: |
| processed = tcp_conn->in.offset - offset; |
| BUG_ON(processed == 0); |
| return processed; |
| |
| again: |
| processed = tcp_conn->in.offset - offset; |
| debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", |
| processed, (int)len, (int)rd_desc->count); |
| BUG_ON(processed == 0); |
| BUG_ON(processed > len); |
| |
| conn->rxdata_octets += processed; |
| return processed; |
| } |
| |
| static void |
| iscsi_tcp_data_ready(struct sock *sk, int flag) |
| { |
| struct iscsi_conn *conn = sk->sk_user_data; |
| read_descriptor_t rd_desc; |
| |
| read_lock(&sk->sk_callback_lock); |
| |
| /* |
| * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv. |
| * We set count to 1 because we want the network layer to |
| * hand us all the skbs that are available. iscsi_tcp_data_recv |
| * handled pdus that cross buffers or pdus that still need data. |
| */ |
| rd_desc.arg.data = conn; |
| rd_desc.count = 1; |
| tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); |
| |
| read_unlock(&sk->sk_callback_lock); |
| } |
| |
| static void |
| iscsi_tcp_state_change(struct sock *sk) |
| { |
| struct iscsi_tcp_conn *tcp_conn; |
| struct iscsi_conn *conn; |
| struct iscsi_session *session; |
| void (*old_state_change)(struct sock *); |
| |
| read_lock(&sk->sk_callback_lock); |
| |
| conn = (struct iscsi_conn*)sk->sk_user_data; |
| session = conn->session; |
| |
| if ((sk->sk_state == TCP_CLOSE_WAIT || |
| sk->sk_state == TCP_CLOSE) && |
| !atomic_read(&sk->sk_rmem_alloc)) { |
| debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
| iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| } |
| |
| tcp_conn = conn->dd_data; |
| old_state_change = tcp_conn->old_state_change; |
| |
| read_unlock(&sk->sk_callback_lock); |
| |
| old_state_change(sk); |
| } |
| |
| /** |
| * iscsi_write_space - Called when more output buffer space is available |
| * @sk: socket space is available for |
| **/ |
| static void |
| iscsi_write_space(struct sock *sk) |
| { |
| struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| |
| tcp_conn->old_write_space(sk); |
| debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
| scsi_queue_work(conn->session->host, &conn->xmitwork); |
| } |
| |
| static void |
| iscsi_conn_set_callbacks(struct iscsi_conn *conn) |
| { |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| struct sock *sk = tcp_conn->sock->sk; |
| |
| /* assign new callbacks */ |
| write_lock_bh(&sk->sk_callback_lock); |
| sk->sk_user_data = conn; |
| tcp_conn->old_data_ready = sk->sk_data_ready; |
| tcp_conn->old_state_change = sk->sk_state_change; |
| tcp_conn->old_write_space = sk->sk_write_space; |
| sk->sk_data_ready = iscsi_tcp_data_ready; |
| sk->sk_state_change = iscsi_tcp_state_change; |
| sk->sk_write_space = iscsi_write_space; |
| write_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| static void |
| iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) |
| { |
| struct sock *sk = tcp_conn->sock->sk; |
| |
| /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ |
| write_lock_bh(&sk->sk_callback_lock); |
| sk->sk_user_data = NULL; |
| sk->sk_data_ready = tcp_conn->old_data_ready; |
| sk->sk_state_change = tcp_conn->old_state_change; |
| sk->sk_write_space = tcp_conn->old_write_space; |
| sk->sk_no_check = 0; |
| write_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| /** |
| * iscsi_send - generic send routine |
| * @sk: kernel's socket |
| * @buf: buffer to write from |
| * @size: actual size to write |
| * @flags: socket's flags |
| */ |
| static inline int |
| iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
| { |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| struct socket *sk = tcp_conn->sock; |
| int offset = buf->sg.offset + buf->sent, res; |
| |
| /* |
| * if we got use_sg=0 or are sending something we kmallocd |
| * then we did not have to do kmap (kmap returns page_address) |
| * |
| * if we got use_sg > 0, but had to drop down, we do not |
| * set clustering so this should only happen for that |
| * slab case. |
| */ |
| if (buf->use_sendmsg) |
| res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags); |
| else |
| res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags); |
| |
| if (res >= 0) { |
| conn->txdata_octets += res; |
| buf->sent += res; |
| return res; |
| } |
| |
| tcp_conn->sendpage_failures_cnt++; |
| if (res == -EAGAIN) |
| res = -ENOBUFS; |
| else |
| iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| return res; |
| } |
| |
| /** |
| * iscsi_sendhdr - send PDU Header via tcp_sendpage() |
| * @conn: iscsi connection |
| * @buf: buffer to write from |
| * @datalen: lenght of data to be sent after the header |
| * |
| * Notes: |
| * (Tx, Fast Path) |
| **/ |
| static inline int |
| iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) |
| { |
| int flags = 0; /* MSG_DONTWAIT; */ |
| int res, size; |
| |
| size = buf->sg.length - buf->sent; |
| BUG_ON(buf->sent + size > buf->sg.length); |
| if (buf->sent + size != buf->sg.length || datalen) |
| flags |= MSG_MORE; |
| |
| res = iscsi_send(conn, buf, size, flags); |
| debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
| if (res >= 0) { |
| if (size != res) |
| return -EAGAIN; |
| return 0; |
| } |
| |
| return res; |
| } |
| |
| /** |
| * iscsi_sendpage - send one page of iSCSI Data-Out. |
| * @conn: iscsi connection |
| * @buf: buffer to write from |
| * @count: remaining data |
| * @sent: number of bytes sent |
| * |
| * Notes: |
| * (Tx, Fast Path) |
| **/ |
| static inline int |
| iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, |
| int *count, int *sent) |
| { |
| int flags = 0; /* MSG_DONTWAIT; */ |
| int res, size; |
| |
| size = buf->sg.length - buf->sent; |
| BUG_ON(buf->sent + size > buf->sg.length); |
| if (size > *count) |
| size = *count; |
| if (buf->sent + size != buf->sg.length || *count != size) |
| flags |= MSG_MORE; |
| |
| res = iscsi_send(conn, buf, size, flags); |
| debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
| size, buf->sent, *count, *sent, res); |
| if (res >= 0) { |
| *count -= res; |
| *sent += res; |
| if (size != res) |
| return -EAGAIN; |
| return 0; |
| } |
| |
| return res; |
| } |
| |
| static inline void |
| iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
| struct iscsi_tcp_cmd_task *tcp_ctask) |
| { |
| crypto_hash_init(&tcp_conn->tx_hash); |
| tcp_ctask->digest_count = 4; |
| } |
| |
| /** |
| * iscsi_solicit_data_cont - initialize next Data-Out |
| * @conn: iscsi connection |
| * @ctask: scsi command task |
| * @r2t: R2T info |
| * @left: bytes left to transfer |
| * |
| * Notes: |
| * Initialize next Data-Out within this R2T sequence and continue |
| * to process next Scatter-Gather element(if any) of this SCSI command. |
| * |
| * Called under connection lock. |
| **/ |
| static void |
| iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
| struct iscsi_r2t_info *r2t, int left) |
| { |
| struct iscsi_data *hdr; |
| struct scsi_cmnd *sc = ctask->sc; |
| int new_offset; |
| |
| hdr = &r2t->dtask.hdr; |
| memset(hdr, 0, sizeof(struct iscsi_data)); |
| hdr->ttt = r2t->ttt; |
| hdr->datasn = cpu_to_be32(r2t->solicit_datasn); |
| r2t->solicit_datasn++; |
| hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
| memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
| hdr->itt = ctask->hdr->itt; |
| hdr->exp_statsn = r2t->exp_statsn; |
| new_offset = r2t->data_offset + r2t->sent; |
| hdr->offset = cpu_to_be32(new_offset); |
| if (left > conn->max_xmit_dlength) { |
| hton24(hdr->dlength, conn->max_xmit_dlength); |
| r2t->data_count = conn->max_xmit_dlength; |
| } else { |
| hton24(hdr->dlength, left); |
| r2t->data_count = left; |
| hdr->flags = ISCSI_FLAG_CMD_FINAL; |
| } |
| conn->dataout_pdus_cnt++; |
| |
| iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
| sizeof(struct iscsi_hdr)); |
| |
| if (iscsi_buf_left(&r2t->sendbuf)) |
| return; |
| |
| if (sc->use_sg) { |
| iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
| r2t->sg += 1; |
| } else { |
| iscsi_buf_init_iov(&r2t->sendbuf, |
| (char*)sc->request_buffer + new_offset, |
| r2t->data_count); |
| r2t->sg = NULL; |
| } |
| } |
| |
| static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask, |
| unsigned long len) |
| { |
| tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1); |
| if (!tcp_ctask->pad_count) |
| return; |
| |
| tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count; |
| debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count); |
| tcp_ctask->xmstate |= XMSTATE_W_PAD; |
| } |
| |
| /** |
| * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
| * @conn: iscsi connection |
| * @ctask: scsi command task |
| * @sc: scsi command |
| **/ |
| static void |
| iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
| { |
| struct scsi_cmnd *sc = ctask->sc; |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| |
| BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
| |
| tcp_ctask->sent = 0; |
| tcp_ctask->sg_count = 0; |
| |
| if (sc->sc_data_direction == DMA_TO_DEVICE) { |
| tcp_ctask->xmstate = XMSTATE_W_HDR; |
| tcp_ctask->exp_r2tsn = 0; |
| BUG_ON(ctask->total_length == 0); |
| |
| if (sc->use_sg) { |
| struct scatterlist *sg = sc->request_buffer; |
| |
| iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg); |
| tcp_ctask->sg = sg + 1; |
| tcp_ctask->bad_sg = sg + sc->use_sg; |
| } else { |
| iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
| sc->request_buffer, |
| sc->request_bufflen); |
| tcp_ctask->sg = NULL; |
| tcp_ctask->bad_sg = NULL; |
| } |
| debug_scsi("cmd [itt 0x%x total %d imm_data %d " |
| "unsol count %d, unsol offset %d]\n", |
| ctask->itt, ctask->total_length, ctask->imm_count, |
| ctask->unsol_count, ctask->unsol_offset); |
| } else |
| tcp_ctask->xmstate = XMSTATE_R_HDR; |
| |
| iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, |
| sizeof(struct iscsi_hdr)); |
| } |
| |
| /** |
| * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
| * @conn: iscsi connection |
| * @mtask: task management task |
| * |
| * Notes: |
| * The function can return -EAGAIN in which case caller must |
| * call it again later, or recover. '0' return code means successful |
| * xmit. |
| * |
| * Management xmit state machine consists of two states: |
| * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress |
| * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress |
| **/ |
| static int |
| iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
| { |
| struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
| int rc; |
| |
| debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", |
| conn->id, tcp_mtask->xmstate, mtask->itt); |
| |
| if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { |
| tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; |
| if (mtask->data_count) |
| tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
| if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
| conn->stop_stage != STOP_CONN_RECOVER && |
| conn->hdrdgst_en) |
| iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
| (u8*)tcp_mtask->hdrext); |
| rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf, |
| mtask->data_count); |
| if (rc) { |
| tcp_mtask->xmstate |= XMSTATE_IMM_HDR; |
| if (mtask->data_count) |
| tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
| return rc; |
| } |
| } |
| |
| if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
| BUG_ON(!mtask->data_count); |
| tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
| /* FIXME: implement. |
| * Virtual buffer could be spreaded across multiple pages... |
| */ |
| do { |
| int rc; |
| |
| rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf, |
| &mtask->data_count, &tcp_mtask->sent); |
| if (rc) { |
| tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
| return rc; |
| } |
| } while (mtask->data_count); |
| } |
| |
| BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
| if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { |
| struct iscsi_session *session = conn->session; |
| |
| spin_lock_bh(&session->lock); |
| list_del(&conn->mtask->running); |
| __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, |
| sizeof(void*)); |
| spin_unlock_bh(&session->lock); |
| } |
| return 0; |
| } |
| |
| static inline int |
| iscsi_send_read_hdr(struct iscsi_conn *conn, |
| struct iscsi_tcp_cmd_task *tcp_ctask) |
| { |
| int rc; |
| |
| tcp_ctask->xmstate &= ~XMSTATE_R_HDR; |
| if (conn->hdrdgst_en) |
| iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
| (u8*)tcp_ctask->hdrext); |
| rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0); |
| if (!rc) { |
| BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE); |
| return 0; /* wait for Data-In */ |
| } |
| tcp_ctask->xmstate |= XMSTATE_R_HDR; |
| return rc; |
| } |
| |
| static inline int |
| iscsi_send_write_hdr(struct iscsi_conn *conn, |
| struct iscsi_cmd_task *ctask) |
| { |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| int rc; |
| |
| tcp_ctask->xmstate &= ~XMSTATE_W_HDR; |
| if (conn->hdrdgst_en) |
| iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
| (u8*)tcp_ctask->hdrext); |
| rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count); |
| if (rc) { |
| tcp_ctask->xmstate |= XMSTATE_W_HDR; |
| return rc; |
| } |
| |
| if (ctask->imm_count) { |
| tcp_ctask->xmstate |= XMSTATE_IMM_DATA; |
| iscsi_set_padding(tcp_ctask, ctask->imm_count); |
| |
| if (ctask->conn->datadgst_en) { |
| iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask); |
| tcp_ctask->immdigest = 0; |
| } |
| } |
| |
| if (ctask->unsol_count) |
| tcp_ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT; |
| return 0; |
| } |
| |
| static int |
| iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| { |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| int sent = 0, rc; |
| |
| if (tcp_ctask->xmstate & XMSTATE_W_PAD) { |
| iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, |
| tcp_ctask->pad_count); |
| if (conn->datadgst_en) |
| crypto_hash_update(&tcp_conn->tx_hash, |
| &tcp_ctask->sendbuf.sg, |
| tcp_ctask->sendbuf.sg.length); |
| } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD)) |
| return 0; |
| |
| tcp_ctask->xmstate &= ~XMSTATE_W_PAD; |
| tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD; |
| debug_scsi("sending %d pad bytes for itt 0x%x\n", |
| tcp_ctask->pad_count, ctask->itt); |
| rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, |
| &sent); |
| if (rc) { |
| debug_scsi("padding send failed %d\n", rc); |
| tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD; |
| } |
| return rc; |
| } |
| |
| static int |
| iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
| struct iscsi_buf *buf, uint32_t *digest) |
| { |
| struct iscsi_tcp_cmd_task *tcp_ctask; |
| struct iscsi_tcp_conn *tcp_conn; |
| int rc, sent = 0; |
| |
| if (!conn->datadgst_en) |
| return 0; |
| |
| tcp_ctask = ctask->dd_data; |
| tcp_conn = conn->dd_data; |
| |
| if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) { |
| crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest); |
| iscsi_buf_init_iov(buf, (char*)digest, 4); |
| } |
| tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST; |
| |
| rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
| if (!rc) |
| debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest, |
| ctask->itt); |
| else { |
| debug_scsi("sending digest 0x%x failed for itt 0x%x!\n", |
| *digest, ctask->itt); |
| tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST; |
| } |
| return rc; |
| } |
| |
| static int |
| iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf, |
| struct scatterlist **sg, int *sent, int *count, |
| struct iscsi_buf *digestbuf, uint32_t *digest) |
| { |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| struct iscsi_conn *conn = ctask->conn; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| int rc, buf_sent, offset; |
| |
| while (*count) { |
| buf_sent = 0; |
| offset = sendbuf->sent; |
| |
| rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent); |
| *sent = *sent + buf_sent; |
| if (buf_sent && conn->datadgst_en) |
| partial_sg_digest_update(&tcp_conn->tx_hash, |
| &sendbuf->sg, sendbuf->sg.offset + offset, |
| buf_sent); |
| if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) { |
| iscsi_buf_init_sg(sendbuf, *sg); |
| *sg = *sg + 1; |
| } |
| |
| if (rc) |
| return rc; |
| } |
| |
| rc = iscsi_send_padding(conn, ctask); |
| if (rc) |
| return rc; |
| |
| return iscsi_send_digest(conn, ctask, digestbuf, digest); |
| } |
| |
| static int |
| iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| { |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| struct iscsi_data_task *dtask; |
| int rc; |
| |
| tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
| if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { |
| dtask = &tcp_ctask->unsol_dtask; |
| |
| iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr); |
| iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, |
| sizeof(struct iscsi_hdr)); |
| if (conn->hdrdgst_en) |
| iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
| (u8*)dtask->hdrext); |
| |
| tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
| iscsi_set_padding(tcp_ctask, ctask->data_count); |
| } |
| |
| rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count); |
| if (rc) { |
| tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
| tcp_ctask->xmstate |= XMSTATE_UNS_HDR; |
| return rc; |
| } |
| |
| if (conn->datadgst_en) { |
| dtask = &tcp_ctask->unsol_dtask; |
| iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask); |
| dtask->digest = 0; |
| } |
| |
| debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", |
| ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
| return 0; |
| } |
| |
| static int |
| iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| { |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| int rc; |
| |
| if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
| BUG_ON(!ctask->unsol_count); |
| tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; |
| send_hdr: |
| rc = iscsi_send_unsol_hdr(conn, ctask); |
| if (rc) |
| return rc; |
| } |
| |
| if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
| struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask; |
| int start = tcp_ctask->sent; |
| |
| rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg, |
| &tcp_ctask->sent, &ctask->data_count, |
| &dtask->digestbuf, &dtask->digest); |
| ctask->unsol_count -= tcp_ctask->sent - start; |
| if (rc) |
| return rc; |
| tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
| /* |
| * Done with the Data-Out. Next, check if we need |
| * to send another unsolicited Data-Out. |
| */ |
| if (ctask->unsol_count) { |
| debug_scsi("sending more uns\n"); |
| tcp_ctask->xmstate |= XMSTATE_UNS_INIT; |
| goto send_hdr; |
| } |
| } |
| return 0; |
| } |
| |
| static int iscsi_send_sol_pdu(struct iscsi_conn *conn, |
| struct iscsi_cmd_task *ctask) |
| { |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| struct iscsi_session *session = conn->session; |
| struct iscsi_r2t_info *r2t; |
| struct iscsi_data_task *dtask; |
| int left, rc; |
| |
| if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { |
| tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
| tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
| if (!tcp_ctask->r2t) |
| __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, |
| sizeof(void*)); |
| send_hdr: |
| r2t = tcp_ctask->r2t; |
| dtask = &r2t->dtask; |
| |
| if (conn->hdrdgst_en) |
| iscsi_hdr_digest(conn, &r2t->headbuf, |
| (u8*)dtask->hdrext); |
| rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count); |
| if (rc) { |
| tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
| tcp_ctask->xmstate |= XMSTATE_SOL_HDR; |
| return rc; |
| } |
| |
| if (conn->datadgst_en) { |
| iscsi_data_digest_init(conn->dd_data, tcp_ctask); |
| dtask->digest = 0; |
| } |
| |
| iscsi_set_padding(tcp_ctask, r2t->data_count); |
| debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", |
| r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, |
| r2t->sent); |
| } |
| |
| if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
| r2t = tcp_ctask->r2t; |
| dtask = &r2t->dtask; |
| |
| rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg, |
| &r2t->sent, &r2t->data_count, |
| &dtask->digestbuf, &dtask->digest); |
| if (rc) |
| return rc; |
| tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
| |
| /* |
| * Done with this Data-Out. Next, check if we have |
| * to send another Data-Out for this R2T. |
| */ |
| BUG_ON(r2t->data_length - r2t->sent < 0); |
| left = r2t->data_length - r2t->sent; |
| if (left) { |
| iscsi_solicit_data_cont(conn, ctask, r2t, left); |
| tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
| tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
| goto send_hdr; |
| } |
| |
| /* |
| * Done with this R2T. Check if there are more |
| * outstanding R2Ts ready to be processed. |
| */ |
| spin_lock_bh(&session->lock); |
| tcp_ctask->r2t = NULL; |
| __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, |
| sizeof(void*)); |
| if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, |
| sizeof(void*))) { |
| tcp_ctask->r2t = r2t; |
| tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
| tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
| spin_unlock_bh(&session->lock); |
| goto send_hdr; |
| } |
| spin_unlock_bh(&session->lock); |
| } |
| return 0; |
| } |
| |
| static int |
| iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
| { |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| int rc = 0; |
| |
| debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", |
| conn->id, tcp_ctask->xmstate, ctask->itt); |
| |
| /* |
| * serialize with TMF AbortTask |
| */ |
| if (ctask->mtask) |
| return rc; |
| |
| if (tcp_ctask->xmstate & XMSTATE_R_HDR) |
| return iscsi_send_read_hdr(conn, tcp_ctask); |
| |
| if (tcp_ctask->xmstate & XMSTATE_W_HDR) { |
| rc = iscsi_send_write_hdr(conn, ctask); |
| if (rc) |
| return rc; |
| } |
| |
| if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
| rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg, |
| &tcp_ctask->sent, &ctask->imm_count, |
| &tcp_ctask->immbuf, &tcp_ctask->immdigest); |
| if (rc) |
| return rc; |
| tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
| } |
| |
| rc = iscsi_send_unsol_pdu(conn, ctask); |
| if (rc) |
| return rc; |
| |
| rc = iscsi_send_sol_pdu(conn, ctask); |
| if (rc) |
| return rc; |
| |
| return rc; |
| } |
| |
| static struct iscsi_cls_conn * |
| iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) |
| { |
| struct iscsi_conn *conn; |
| struct iscsi_cls_conn *cls_conn; |
| struct iscsi_tcp_conn *tcp_conn; |
| |
| cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
| if (!cls_conn) |
| return NULL; |
| conn = cls_conn->dd_data; |
| /* |
| * due to strange issues with iser these are not set |
| * in iscsi_conn_setup |
| */ |
| conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; |
| |
| tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
| if (!tcp_conn) |
| goto tcp_conn_alloc_fail; |
| |
| conn->dd_data = tcp_conn; |
| tcp_conn->iscsi_conn = conn; |
| tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
| /* initial operational parameters */ |
| tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
| |
| tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
| CRYPTO_ALG_ASYNC); |
| tcp_conn->tx_hash.flags = 0; |
| if (!tcp_conn->tx_hash.tfm) |
| goto free_tcp_conn; |
| |
| tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
| CRYPTO_ALG_ASYNC); |
| tcp_conn->rx_hash.flags = 0; |
| if (!tcp_conn->rx_hash.tfm) |
| goto free_tx_tfm; |
| |
| return cls_conn; |
| |
| free_tx_tfm: |
| crypto_free_hash(tcp_conn->tx_hash.tfm); |
| free_tcp_conn: |
| kfree(tcp_conn); |
| tcp_conn_alloc_fail: |
| iscsi_conn_teardown(cls_conn); |
| return NULL; |
| } |
| |
| static void |
| iscsi_tcp_release_conn(struct iscsi_conn *conn) |
| { |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| |
| if (!tcp_conn->sock) |
| return; |
| |
| sock_hold(tcp_conn->sock->sk); |
| iscsi_conn_restore_callbacks(tcp_conn); |
| sock_put(tcp_conn->sock->sk); |
| |
| sock_release(tcp_conn->sock); |
| tcp_conn->sock = NULL; |
| conn->recv_lock = NULL; |
| } |
| |
| static void |
| iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
| { |
| struct iscsi_conn *conn = cls_conn->dd_data; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| |
| iscsi_tcp_release_conn(conn); |
| iscsi_conn_teardown(cls_conn); |
| |
| if (tcp_conn->tx_hash.tfm) |
| crypto_free_hash(tcp_conn->tx_hash.tfm); |
| if (tcp_conn->rx_hash.tfm) |
| crypto_free_hash(tcp_conn->rx_hash.tfm); |
| |
| kfree(tcp_conn); |
| } |
| |
| static void |
| iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
| { |
| struct iscsi_conn *conn = cls_conn->dd_data; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| |
| iscsi_conn_stop(cls_conn, flag); |
| iscsi_tcp_release_conn(conn); |
| tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
| } |
| |
| static int |
| iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
| struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
| int is_leading) |
| { |
| struct iscsi_conn *conn = cls_conn->dd_data; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| struct sock *sk; |
| struct socket *sock; |
| int err; |
| |
| /* lookup for existing socket */ |
| sock = sockfd_lookup((int)transport_eph, &err); |
| if (!sock) { |
| printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); |
| return -EEXIST; |
| } |
| |
| err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
| if (err) |
| return err; |
| |
| /* bind iSCSI connection and socket */ |
| tcp_conn->sock = sock; |
| |
| /* setup Socket parameters */ |
| sk = sock->sk; |
| sk->sk_reuse = 1; |
| sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ |
| sk->sk_allocation = GFP_ATOMIC; |
| |
| /* FIXME: disable Nagle's algorithm */ |
| |
| /* |
| * Intercept TCP callbacks for sendfile like receive |
| * processing. |
| */ |
| conn->recv_lock = &sk->sk_callback_lock; |
| iscsi_conn_set_callbacks(conn); |
| tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; |
| /* |
| * set receive state machine into initial state |
| */ |
| tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
| |
| return 0; |
| } |
| |
| /* called with host lock */ |
| static void |
| iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask, |
| char *data, uint32_t data_size) |
| { |
| struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
| |
| iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr, |
| sizeof(struct iscsi_hdr)); |
| tcp_mtask->xmstate = XMSTATE_IMM_HDR; |
| tcp_mtask->sent = 0; |
| |
| if (mtask->data_count) |
| iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data, |
| mtask->data_count); |
| } |
| |
| static int |
| iscsi_r2tpool_alloc(struct iscsi_session *session) |
| { |
| int i; |
| int cmd_i; |
| |
| /* |
| * initialize per-task: R2T pool and xmit queue |
| */ |
| for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { |
| struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| |
| /* |
| * pre-allocated x4 as much r2ts to handle race when |
| * target acks DataOut faster than we data_xmit() queues |
| * could replenish r2tqueue. |
| */ |
| |
| /* R2T pool */ |
| if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
| (void***)&tcp_ctask->r2ts, |
| sizeof(struct iscsi_r2t_info))) { |
| goto r2t_alloc_fail; |
| } |
| |
| /* R2T xmit queue */ |
| tcp_ctask->r2tqueue = kfifo_alloc( |
| session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
| if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
| iscsi_pool_free(&tcp_ctask->r2tpool, |
| (void**)tcp_ctask->r2ts); |
| goto r2t_alloc_fail; |
| } |
| } |
| |
| return 0; |
| |
| r2t_alloc_fail: |
| for (i = 0; i < cmd_i; i++) { |
| struct iscsi_cmd_task *ctask = session->cmds[i]; |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| |
| kfifo_free(tcp_ctask->r2tqueue); |
| iscsi_pool_free(&tcp_ctask->r2tpool, |
| (void**)tcp_ctask->r2ts); |
| } |
| return -ENOMEM; |
| } |
| |
| static void |
| iscsi_r2tpool_free(struct iscsi_session *session) |
| { |
| int i; |
| |
| for (i = 0; i < session->cmds_max; i++) { |
| struct iscsi_cmd_task *ctask = session->cmds[i]; |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| |
| kfifo_free(tcp_ctask->r2tqueue); |
| iscsi_pool_free(&tcp_ctask->r2tpool, |
| (void**)tcp_ctask->r2ts); |
| } |
| } |
| |
| static int |
| iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
| char *buf, int buflen) |
| { |
| struct iscsi_conn *conn = cls_conn->dd_data; |
| struct iscsi_session *session = conn->session; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| int value; |
| |
| switch(param) { |
| case ISCSI_PARAM_HDRDGST_EN: |
| iscsi_set_param(cls_conn, param, buf, buflen); |
| tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
| if (conn->hdrdgst_en) |
| tcp_conn->hdr_size += sizeof(__u32); |
| break; |
| case ISCSI_PARAM_DATADGST_EN: |
| iscsi_set_param(cls_conn, param, buf, buflen); |
| tcp_conn->sendpage = conn->datadgst_en ? |
| sock_no_sendpage : tcp_conn->sock->ops->sendpage; |
| break; |
| case ISCSI_PARAM_MAX_R2T: |
| sscanf(buf, "%d", &value); |
| if (session->max_r2t == roundup_pow_of_two(value)) |
| break; |
| iscsi_r2tpool_free(session); |
| iscsi_set_param(cls_conn, param, buf, buflen); |
| if (session->max_r2t & (session->max_r2t - 1)) |
| session->max_r2t = roundup_pow_of_two(session->max_r2t); |
| if (iscsi_r2tpool_alloc(session)) |
| return -ENOMEM; |
| break; |
| default: |
| return iscsi_set_param(cls_conn, param, buf, buflen); |
| } |
| |
| return 0; |
| } |
| |
| static int |
| iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
| enum iscsi_param param, char *buf) |
| { |
| struct iscsi_conn *conn = cls_conn->dd_data; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| struct inet_sock *inet; |
| struct ipv6_pinfo *np; |
| struct sock *sk; |
| int len; |
| |
| switch(param) { |
| case ISCSI_PARAM_CONN_PORT: |
| mutex_lock(&conn->xmitmutex); |
| if (!tcp_conn->sock) { |
| mutex_unlock(&conn->xmitmutex); |
| return -EINVAL; |
| } |
| |
| inet = inet_sk(tcp_conn->sock->sk); |
| len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport)); |
| mutex_unlock(&conn->xmitmutex); |
| break; |
| case ISCSI_PARAM_CONN_ADDRESS: |
| mutex_lock(&conn->xmitmutex); |
| if (!tcp_conn->sock) { |
| mutex_unlock(&conn->xmitmutex); |
| return -EINVAL; |
| } |
| |
| sk = tcp_conn->sock->sk; |
| if (sk->sk_family == PF_INET) { |
| inet = inet_sk(sk); |
| len = sprintf(buf, "%u.%u.%u.%u\n", |
| NIPQUAD(inet->daddr)); |
| } else { |
| np = inet6_sk(sk); |
| len = sprintf(buf, |
| "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", |
| NIP6(np->daddr)); |
| } |
| mutex_unlock(&conn->xmitmutex); |
| break; |
| default: |
| return iscsi_conn_get_param(cls_conn, param, buf); |
| } |
| |
| return len; |
| } |
| |
| static void |
| iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
| { |
| struct iscsi_conn *conn = cls_conn->dd_data; |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| |
| stats->txdata_octets = conn->txdata_octets; |
| stats->rxdata_octets = conn->rxdata_octets; |
| stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; |
| stats->dataout_pdus = conn->dataout_pdus_cnt; |
| stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; |
| stats->datain_pdus = conn->datain_pdus_cnt; |
| stats->r2t_pdus = conn->r2t_pdus_cnt; |
| stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; |
| stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; |
| stats->custom_length = 3; |
| strcpy(stats->custom[0].desc, "tx_sendpage_failures"); |
| stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
| strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
| stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
| strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
| stats->custom[2].value = conn->eh_abort_cnt; |
| } |
| |
| static struct iscsi_cls_session * |
| iscsi_tcp_session_create(struct iscsi_transport *iscsit, |
| struct scsi_transport_template *scsit, |
| uint32_t initial_cmdsn, uint32_t *hostno) |
| { |
| struct iscsi_cls_session *cls_session; |
| struct iscsi_session *session; |
| uint32_t hn; |
| int cmd_i; |
| |
| cls_session = iscsi_session_setup(iscsit, scsit, |
| sizeof(struct iscsi_tcp_cmd_task), |
| sizeof(struct iscsi_tcp_mgmt_task), |
| initial_cmdsn, &hn); |
| if (!cls_session) |
| return NULL; |
| *hostno = hn; |
| |
| session = class_to_transport_session(cls_session); |
| for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { |
| struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; |
| struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
| |
| ctask->hdr = &tcp_ctask->hdr; |
| } |
| |
| for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { |
| struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; |
| struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
| |
| mtask->hdr = &tcp_mtask->hdr; |
| } |
| |
| if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) |
| goto r2tpool_alloc_fail; |
| |
| return cls_session; |
| |
| r2tpool_alloc_fail: |
| iscsi_session_teardown(cls_session); |
| return NULL; |
| } |
| |
| static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
| { |
| iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
| iscsi_session_teardown(cls_session); |
| } |
| |
| static struct scsi_host_template iscsi_sht = { |
| .name = "iSCSI Initiator over TCP/IP", |
| .queuecommand = iscsi_queuecommand, |
| .change_queue_depth = iscsi_change_queue_depth, |
| .can_queue = ISCSI_XMIT_CMDS_MAX - 1, |
| .sg_tablesize = ISCSI_SG_TABLESIZE, |
| .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
| .eh_abort_handler = iscsi_eh_abort, |
| .eh_host_reset_handler = iscsi_eh_host_reset, |
| .use_clustering = DISABLE_CLUSTERING, |
| .proc_name = "iscsi_tcp", |
| .this_id = -1, |
| }; |
| |
| static struct iscsi_transport iscsi_tcp_transport = { |
| .owner = THIS_MODULE, |
| .name = "tcp", |
| .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
| | CAP_DATADGST, |
| .param_mask = ISCSI_MAX_RECV_DLENGTH | |
| ISCSI_MAX_XMIT_DLENGTH | |
| ISCSI_HDRDGST_EN | |
| ISCSI_DATADGST_EN | |
| ISCSI_INITIAL_R2T_EN | |
| ISCSI_MAX_R2T | |
| ISCSI_IMM_DATA_EN | |
| ISCSI_FIRST_BURST | |
| ISCSI_MAX_BURST | |
| ISCSI_PDU_INORDER_EN | |
| ISCSI_DATASEQ_INORDER_EN | |
| ISCSI_ERL | |
| ISCSI_CONN_PORT | |
| ISCSI_CONN_ADDRESS | |
| ISCSI_EXP_STATSN | |
| ISCSI_PERSISTENT_PORT | |
| ISCSI_PERSISTENT_ADDRESS | |
| ISCSI_TARGET_NAME | |
| ISCSI_TPGT, |
| .host_template = &iscsi_sht, |
| .conndata_size = sizeof(struct iscsi_conn), |
| .max_conn = 1, |
| .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, |
| /* session management */ |
| .create_session = iscsi_tcp_session_create, |
| .destroy_session = iscsi_tcp_session_destroy, |
| /* connection management */ |
| .create_conn = iscsi_tcp_conn_create, |
| .bind_conn = iscsi_tcp_conn_bind, |
| .destroy_conn = iscsi_tcp_conn_destroy, |
| .set_param = iscsi_conn_set_param, |
| .get_conn_param = iscsi_tcp_conn_get_param, |
| .get_session_param = iscsi_session_get_param, |
| .start_conn = iscsi_conn_start, |
| .stop_conn = iscsi_tcp_conn_stop, |
| /* IO */ |
| .send_pdu = iscsi_conn_send_pdu, |
| .get_stats = iscsi_conn_get_stats, |
| .init_cmd_task = iscsi_tcp_cmd_init, |
| .init_mgmt_task = iscsi_tcp_mgmt_init, |
| .xmit_cmd_task = iscsi_tcp_ctask_xmit, |
| .xmit_mgmt_task = iscsi_tcp_mtask_xmit, |
| .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, |
| /* recovery */ |
| .session_recovery_timedout = iscsi_session_recovery_timedout, |
| }; |
| |
| static int __init |
| iscsi_tcp_init(void) |
| { |
| if (iscsi_max_lun < 1) { |
| printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
| iscsi_max_lun); |
| return -EINVAL; |
| } |
| iscsi_tcp_transport.max_lun = iscsi_max_lun; |
| |
| if (!iscsi_register_transport(&iscsi_tcp_transport)) |
| return -ENODEV; |
| |
| return 0; |
| } |
| |
| static void __exit |
| iscsi_tcp_exit(void) |
| { |
| iscsi_unregister_transport(&iscsi_tcp_transport); |
| } |
| |
| module_init(iscsi_tcp_init); |
| module_exit(iscsi_tcp_exit); |