2 * iSCSI Initiator over TCP/IP Data-Path
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
6 * Copyright (C) 2005 Mike Christie
7 * maintained by open-iscsi@googlegroups.com
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published
11 * by the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * See the file COPYING included with this distribution for more details.
28 #include <linux/types.h>
29 #include <linux/list.h>
30 #include <linux/inet.h>
31 #include <linux/blkdev.h>
32 #include <linux/crypto.h>
33 #include <linux/delay.h>
34 #include <linux/kfifo.h>
35 #include <linux/scatterlist.h>
37 #include <scsi/scsi_cmnd.h>
38 #include <scsi/scsi_device.h>
39 #include <scsi/scsi_eh.h>
40 #include <scsi/scsi_request.h>
41 #include <scsi/scsi_tcq.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_transport_iscsi.h>
46 #include "iscsi_tcp.h"
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");
52 MODULE_VERSION("0:4.409");
53 /* #define DEBUG_TCP */
54 /* #define DEBUG_SCSI */
58 #define debug_tcp(fmt...) printk(KERN_DEBUG "tcp: " fmt)
60 #define debug_tcp(fmt...)
64 #define debug_scsi(fmt...) printk(KERN_DEBUG "scsi: " fmt)
66 #define debug_scsi(fmt...)
76 #define INVALID_SN_DELTA 0xffff
78 static unsigned int iscsi_max_lun = 512;
79 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
82 static kmem_cache_t *taskcache;
85 iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size)
87 sg_init_one(&ibuf->sg, (u8 *)vbuf, size);
92 iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
94 ibuf->sg.page = (void*)vbuf;
95 ibuf->sg.offset = (unsigned int)-1;
96 ibuf->sg.length = size;
101 iscsi_buf_iov_base(struct iscsi_buf *ibuf)
103 return (char*)ibuf->sg.page + ibuf->sent;
107 iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
110 * Fastpath: sg element fits into single page
112 if (sg->length + sg->offset <= PAGE_SIZE && page_count(sg->page) >= 2) {
113 ibuf->sg.page = sg->page;
114 ibuf->sg.offset = sg->offset;
115 ibuf->sg.length = sg->length;
117 iscsi_buf_init_iov(ibuf, page_address(sg->page), sg->length);
122 iscsi_buf_left(struct iscsi_buf *ibuf)
126 rc = ibuf->sg.length - ibuf->sent;
132 iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
135 crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc);
136 buf->sg.length += sizeof(uint32_t);
140 iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
142 struct iscsi_session *session = conn->session;
145 spin_lock_irqsave(&session->lock, flags);
146 if (session->conn_cnt == 1 || session->leadconn == conn)
147 session->state = ISCSI_STATE_FAILED;
148 spin_unlock_irqrestore(&session->lock, flags);
149 set_bit(SUSPEND_BIT, &conn->suspend_tx);
150 set_bit(SUSPEND_BIT, &conn->suspend_rx);
151 iscsi_conn_error(iscsi_handle(conn), err);
155 iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
157 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
158 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
160 if (max_cmdsn < exp_cmdsn -1 &&
161 max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
162 return ISCSI_ERR_MAX_CMDSN;
163 if (max_cmdsn > session->max_cmdsn ||
164 max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
165 session->max_cmdsn = max_cmdsn;
166 if (exp_cmdsn > session->exp_cmdsn ||
167 exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
168 session->exp_cmdsn = exp_cmdsn;
174 iscsi_hdr_extract(struct iscsi_conn *conn)
176 struct sk_buff *skb = conn->in.skb;
178 if (conn->in.copy >= conn->hdr_size &&
179 conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
181 * Zero-copy PDU Header: using connection context
182 * to store header pointer.
184 if (skb_shinfo(skb)->frag_list == NULL &&
185 !skb_shinfo(skb)->nr_frags)
186 conn->in.hdr = (struct iscsi_hdr *)
187 ((char*)skb->data + conn->in.offset);
189 /* ignoring return code since we checked
191 skb_copy_bits(skb, conn->in.offset,
192 &conn->hdr, conn->hdr_size);
193 conn->in.hdr = &conn->hdr;
195 conn->in.offset += conn->hdr_size;
196 conn->in.copy -= conn->hdr_size;
202 * PDU header scattered across SKB's,
203 * copying it... This'll happen quite rarely.
206 if (conn->in_progress == IN_PROGRESS_WAIT_HEADER)
207 conn->in.hdr_offset = 0;
209 hdr_remains = conn->hdr_size - conn->in.hdr_offset;
210 BUG_ON(hdr_remains <= 0);
212 copylen = min(conn->in.copy, hdr_remains);
213 skb_copy_bits(skb, conn->in.offset,
214 (char*)&conn->hdr + conn->in.hdr_offset, copylen);
216 debug_tcp("PDU gather offset %d bytes %d in.offset %d "
217 "in.copy %d\n", conn->in.hdr_offset, copylen,
218 conn->in.offset, conn->in.copy);
220 conn->in.offset += copylen;
221 conn->in.copy -= copylen;
222 if (copylen < hdr_remains) {
223 conn->in_progress = IN_PROGRESS_HEADER_GATHER;
224 conn->in.hdr_offset += copylen;
227 conn->in.hdr = &conn->hdr;
228 conn->discontiguous_hdr_cnt++;
229 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
236 iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
238 struct scsi_cmnd *sc = ctask->sc;
239 struct iscsi_session *session = conn->session;
241 spin_lock(&session->lock);
243 spin_unlock(&session->lock);
246 if (sc->sc_data_direction == DMA_TO_DEVICE) {
247 struct iscsi_data_task *dtask, *n;
248 /* WRITE: cleanup Data-Out's if any */
249 spin_lock(&conn->lock);
250 list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
251 list_del(&dtask->item);
252 mempool_free(dtask, ctask->datapool);
254 spin_unlock(&conn->lock);
256 ctask->xmstate = XMSTATE_IDLE;
259 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
260 spin_unlock(&session->lock);
264 * iscsi_cmd_rsp - SCSI Command Response processing
265 * @conn: iscsi connection
266 * @ctask: scsi command task
269 iscsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
272 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)conn->in.hdr;
273 struct iscsi_session *session = conn->session;
274 struct scsi_cmnd *sc = ctask->sc;
276 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
278 sc->result = (DID_ERROR << 16);
282 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
284 sc->result = (DID_OK << 16) | rhdr->cmd_status;
286 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
287 sc->result = (DID_ERROR << 16);
291 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION && conn->senselen) {
292 int sensecopy = min(conn->senselen, SCSI_SENSE_BUFFERSIZE);
294 memcpy(sc->sense_buffer, conn->data + 2, sensecopy);
295 debug_scsi("copied %d bytes of sense\n", sensecopy);
298 if (sc->sc_data_direction == DMA_TO_DEVICE)
301 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
302 int res_count = be32_to_cpu(rhdr->residual_count);
304 if (res_count > 0 && res_count <= sc->request_bufflen)
305 sc->resid = res_count;
307 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
308 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
309 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
310 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
311 sc->resid = be32_to_cpu(rhdr->residual_count);
314 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
315 (long)sc, sc->result, ctask->itt);
316 conn->scsirsp_pdus_cnt++;
317 iscsi_ctask_cleanup(conn, ctask);
323 * iscsi_data_rsp - SCSI Data-In Response processing
324 * @conn: iscsi connection
325 * @ctask: scsi command task
328 iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
331 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)conn->in.hdr;
332 struct iscsi_session *session = conn->session;
333 int datasn = be32_to_cpu(rhdr->datasn);
335 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
339 * setup Data-In byte counter (gets decremented..)
341 ctask->data_count = conn->in.datalen;
343 if (conn->in.datalen == 0)
346 if (ctask->datasn != datasn)
347 return ISCSI_ERR_DATASN;
351 ctask->data_offset = be32_to_cpu(rhdr->offset);
352 if (ctask->data_offset + conn->in.datalen > ctask->total_length)
353 return ISCSI_ERR_DATA_OFFSET;
355 if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
356 struct scsi_cmnd *sc = ctask->sc;
358 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
359 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
360 int res_count = be32_to_cpu(rhdr->residual_count);
363 res_count <= sc->request_bufflen) {
364 sc->resid = res_count;
365 sc->result = (DID_OK << 16) | rhdr->cmd_status;
367 sc->result = (DID_BAD_TARGET << 16) |
369 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
370 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
371 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) {
372 sc->resid = be32_to_cpu(rhdr->residual_count);
373 sc->result = (DID_OK << 16) | rhdr->cmd_status;
375 sc->result = (DID_OK << 16) | rhdr->cmd_status;
378 conn->datain_pdus_cnt++;
383 * iscsi_solicit_data_init - initialize first Data-Out
384 * @conn: iscsi connection
385 * @ctask: scsi command task
389 * Initialize first Data-Out within this R2T sequence and finds
390 * proper data_offset within this SCSI command.
392 * This function is called with connection lock taken.
395 iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
396 struct iscsi_r2t_info *r2t)
398 struct iscsi_data *hdr;
399 struct iscsi_data_task *dtask;
400 struct scsi_cmnd *sc = ctask->sc;
402 dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
405 memset(hdr, 0, sizeof(struct iscsi_data));
407 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
408 r2t->solicit_datasn++;
409 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
410 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
411 hdr->itt = ctask->hdr.itt;
412 hdr->exp_statsn = r2t->exp_statsn;
413 hdr->offset = cpu_to_be32(r2t->data_offset);
414 if (r2t->data_length > conn->max_xmit_dlength) {
415 hton24(hdr->dlength, conn->max_xmit_dlength);
416 r2t->data_count = conn->max_xmit_dlength;
419 hton24(hdr->dlength, r2t->data_length);
420 r2t->data_count = r2t->data_length;
421 hdr->flags = ISCSI_FLAG_CMD_FINAL;
423 conn->dataout_pdus_cnt++;
427 iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
428 sizeof(struct iscsi_hdr));
434 struct scatterlist *sg = sc->request_buffer;
437 for (i = 0; i < sc->use_sg; i++, sg += 1) {
438 /* FIXME: prefetch ? */
439 if (sg_count + sg->length > r2t->data_offset) {
444 /* offset within this page */
445 page_offset = r2t->data_offset - sg_count;
447 /* fill in this buffer */
448 iscsi_buf_init_sg(&r2t->sendbuf, sg);
449 r2t->sendbuf.sg.offset += page_offset;
450 r2t->sendbuf.sg.length -= page_offset;
452 /* xmit logic will continue with next one */
456 sg_count += sg->length;
458 BUG_ON(r2t->sg == NULL);
460 iscsi_buf_init_iov(&ctask->sendbuf,
461 (char*)sc->request_buffer + r2t->data_offset,
464 list_add(&dtask->item, &ctask->dataqueue);
468 * iscsi_r2t_rsp - iSCSI R2T Response processing
469 * @conn: iscsi connection
470 * @ctask: scsi command task
473 iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
475 struct iscsi_r2t_info *r2t;
476 struct iscsi_session *session = conn->session;
477 struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)conn->in.hdr;
478 int r2tsn = be32_to_cpu(rhdr->r2tsn);
482 return ISCSI_ERR_AHSLEN;
484 if (conn->in.datalen)
485 return ISCSI_ERR_DATALEN;
487 if (ctask->exp_r2tsn && ctask->exp_r2tsn != r2tsn)
488 return ISCSI_ERR_R2TSN;
490 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
494 /* FIXME: use R2TSN to detect missing R2T */
496 /* fill-in new R2T associated with the task */
497 spin_lock(&session->lock);
498 if (!ctask->sc || ctask->mtask ||
499 session->state != ISCSI_STATE_LOGGED_IN) {
500 printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
501 "recovery...\n", ctask->itt);
502 spin_unlock(&session->lock);
505 rc = __kfifo_get(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
508 r2t->exp_statsn = rhdr->statsn;
509 r2t->data_length = be32_to_cpu(rhdr->data_length);
510 if (r2t->data_length == 0 ||
511 r2t->data_length > session->max_burst) {
512 spin_unlock(&session->lock);
513 return ISCSI_ERR_DATALEN;
516 r2t->data_offset = be32_to_cpu(rhdr->data_offset);
517 if (r2t->data_offset + r2t->data_length > ctask->total_length) {
518 spin_unlock(&session->lock);
519 return ISCSI_ERR_DATALEN;
522 r2t->ttt = rhdr->ttt; /* no flip */
523 r2t->solicit_datasn = 0;
525 iscsi_solicit_data_init(conn, ctask, r2t);
527 ctask->exp_r2tsn = r2tsn + 1;
528 ctask->xmstate |= XMSTATE_SOL_HDR;
529 __kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*));
530 __kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*));
532 schedule_work(&conn->xmitwork);
533 conn->r2t_pdus_cnt++;
534 spin_unlock(&session->lock);
540 iscsi_hdr_recv(struct iscsi_conn *conn)
543 struct iscsi_hdr *hdr;
544 struct iscsi_cmd_task *ctask;
545 struct iscsi_session *session = conn->session;
546 uint32_t cdgst, rdgst = 0;
550 /* verify PDU length */
551 conn->in.datalen = ntoh24(hdr->dlength);
552 if (conn->in.datalen > conn->max_recv_dlength) {
553 printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
554 conn->in.datalen, conn->max_recv_dlength);
555 return ISCSI_ERR_DATALEN;
557 conn->data_copied = 0;
560 conn->in.ahslen = hdr->hlength * 4;
561 conn->in.offset += conn->in.ahslen;
562 conn->in.copy -= conn->in.ahslen;
563 if (conn->in.copy < 0) {
564 printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
565 "%d bytes\n", conn->in.ahslen);
566 return ISCSI_ERR_AHSLEN;
569 /* calculate read padding */
570 conn->in.padding = conn->in.datalen & (ISCSI_PAD_LEN-1);
571 if (conn->in.padding) {
572 conn->in.padding = ISCSI_PAD_LEN - conn->in.padding;
573 debug_scsi("read padding %d bytes\n", conn->in.padding);
576 if (conn->hdrdgst_en) {
577 struct scatterlist sg;
579 sg_init_one(&sg, (u8 *)hdr,
580 sizeof(struct iscsi_hdr) + conn->in.ahslen);
581 crypto_digest_digest(conn->rx_tfm, &sg, 1, (u8 *)&cdgst);
582 rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
586 /* save opcode for later */
587 conn->in.opcode = hdr->opcode & ISCSI_OPCODE_MASK;
589 /* verify itt (itt encoding: age+cid+itt) */
590 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
591 if ((hdr->itt & AGE_MASK) !=
592 (session->age << AGE_SHIFT)) {
593 printk(KERN_ERR "iscsi_tcp: received itt %x expected "
594 "session age (%x)\n", hdr->itt,
595 session->age & AGE_MASK);
596 return ISCSI_ERR_BAD_ITT;
599 if ((hdr->itt & CID_MASK) != (conn->id << CID_SHIFT)) {
600 printk(KERN_ERR "iscsi_tcp: received itt %x, expected "
601 "CID (%x)\n", hdr->itt, conn->id);
602 return ISCSI_ERR_BAD_ITT;
604 conn->in.itt = hdr->itt & ITT_MASK;
606 conn->in.itt = hdr->itt;
608 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
609 hdr->opcode, conn->in.offset, conn->in.copy,
610 conn->in.ahslen, conn->in.datalen);
612 if (conn->in.itt < session->cmds_max) {
613 if (conn->hdrdgst_en && cdgst != rdgst) {
614 printk(KERN_ERR "iscsi_tcp: itt %x: hdrdgst error "
615 "recv 0x%x calc 0x%x\n", conn->in.itt, rdgst,
617 return ISCSI_ERR_HDR_DGST;
620 ctask = (struct iscsi_cmd_task *)session->cmds[conn->in.itt];
623 printk(KERN_INFO "iscsi_tcp: dropping ctask with "
624 "itt 0x%x\n", ctask->itt);
625 conn->in.datalen = 0; /* force drop */
629 if (ctask->sc->SCp.phase != session->age) {
630 printk(KERN_ERR "iscsi_tcp: ctask's session age %d, "
631 "expected %d\n", ctask->sc->SCp.phase,
633 return ISCSI_ERR_SESSION_FAILED;
636 conn->in.ctask = ctask;
638 debug_scsi("rsp [op 0x%x cid %d sc %lx itt 0x%x len %d]\n",
639 hdr->opcode, conn->id, (long)ctask->sc,
640 ctask->itt, conn->in.datalen);
642 switch(conn->in.opcode) {
643 case ISCSI_OP_SCSI_CMD_RSP:
644 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
645 if (!conn->in.datalen)
646 rc = iscsi_cmd_rsp(conn, ctask);
649 * got sense or response data; copying PDU
650 * Header to the connection's header
653 memcpy(&conn->hdr, hdr,
654 sizeof(struct iscsi_hdr));
656 case ISCSI_OP_SCSI_DATA_IN:
657 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
658 /* save flags for non-exceptional status */
659 conn->in.flags = hdr->flags;
660 /* save cmd_status for sense data */
661 conn->in.cmd_status =
662 ((struct iscsi_data_rsp*)hdr)->cmd_status;
663 rc = iscsi_data_rsp(conn, ctask);
666 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
667 if (ctask->sc->sc_data_direction == DMA_TO_DEVICE)
668 rc = iscsi_r2t_rsp(conn, ctask);
670 rc = ISCSI_ERR_PROTO;
673 rc = ISCSI_ERR_BAD_OPCODE;
676 } else if (conn->in.itt >= ISCSI_MGMT_ITT_OFFSET &&
677 conn->in.itt < ISCSI_MGMT_ITT_OFFSET +
678 session->mgmtpool_max) {
679 struct iscsi_mgmt_task *mtask = (struct iscsi_mgmt_task *)
680 session->mgmt_cmds[conn->in.itt -
681 ISCSI_MGMT_ITT_OFFSET];
683 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
684 conn->in.opcode, conn->id, mtask->itt,
687 switch(conn->in.opcode) {
688 case ISCSI_OP_LOGIN_RSP:
689 case ISCSI_OP_TEXT_RSP:
690 case ISCSI_OP_LOGOUT_RSP:
691 rc = iscsi_check_assign_cmdsn(session,
692 (struct iscsi_nopin*)hdr);
696 if (!conn->in.datalen) {
697 rc = iscsi_recv_pdu(iscsi_handle(conn), hdr,
699 if (conn->login_mtask != mtask) {
700 spin_lock(&session->lock);
701 __kfifo_put(session->mgmtpool.queue,
702 (void*)&mtask, sizeof(void*));
703 spin_unlock(&session->lock);
707 case ISCSI_OP_SCSI_TMFUNC_RSP:
708 rc = iscsi_check_assign_cmdsn(session,
709 (struct iscsi_nopin*)hdr);
713 if (conn->in.datalen || conn->in.ahslen) {
714 rc = ISCSI_ERR_PROTO;
717 conn->tmfrsp_pdus_cnt++;
718 spin_lock(&session->lock);
719 if (conn->tmabort_state == TMABORT_INITIAL) {
720 __kfifo_put(session->mgmtpool.queue,
721 (void*)&mtask, sizeof(void*));
722 conn->tmabort_state =
723 ((struct iscsi_tm_rsp *)hdr)->
724 response == ISCSI_TMF_RSP_COMPLETE ?
725 TMABORT_SUCCESS:TMABORT_FAILED;
726 /* unblock eh_abort() */
727 wake_up(&conn->ehwait);
729 spin_unlock(&session->lock);
731 case ISCSI_OP_NOOP_IN:
732 if (hdr->ttt != ISCSI_RESERVED_TAG) {
733 rc = ISCSI_ERR_PROTO;
736 rc = iscsi_check_assign_cmdsn(session,
737 (struct iscsi_nopin*)hdr);
740 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
742 if (!conn->in.datalen) {
743 struct iscsi_mgmt_task *mtask;
745 rc = iscsi_recv_pdu(iscsi_handle(conn), hdr,
747 mtask = (struct iscsi_mgmt_task *)
748 session->mgmt_cmds[conn->in.itt -
749 ISCSI_MGMT_ITT_OFFSET];
750 if (conn->login_mtask != mtask) {
751 spin_lock(&session->lock);
752 __kfifo_put(session->mgmtpool.queue,
753 (void*)&mtask, sizeof(void*));
754 spin_unlock(&session->lock);
759 rc = ISCSI_ERR_BAD_OPCODE;
762 } else if (conn->in.itt == ISCSI_RESERVED_TAG) {
763 switch(conn->in.opcode) {
764 case ISCSI_OP_NOOP_IN:
765 if (!conn->in.datalen) {
766 rc = iscsi_check_assign_cmdsn(session,
767 (struct iscsi_nopin*)hdr);
768 if (!rc && hdr->ttt != ISCSI_RESERVED_TAG)
769 rc = iscsi_recv_pdu(iscsi_handle(conn),
772 rc = ISCSI_ERR_PROTO;
774 case ISCSI_OP_REJECT:
775 /* we need sth like iscsi_reject_rsp()*/
776 case ISCSI_OP_ASYNC_EVENT:
777 /* we need sth like iscsi_async_event_rsp() */
778 rc = ISCSI_ERR_BAD_OPCODE;
781 rc = ISCSI_ERR_BAD_OPCODE;
785 rc = ISCSI_ERR_BAD_ITT;
791 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
792 * @conn: iscsi connection
793 * @ctask: scsi command task
794 * @buf: buffer to copy to
795 * @buf_size: size of buffer
796 * @offset: offset within the buffer
799 * The function calls skb_copy_bits() and updates per-connection and
800 * per-cmd byte counters.
802 * Read counters (in bytes):
804 * conn->in.offset offset within in progress SKB
805 * conn->in.copy left to copy from in progress SKB
807 * conn->in.copied copied already from in progress SKB
808 * conn->data_copied copied already from in progress buffer
809 * ctask->sent total bytes sent up to the MidLayer
810 * ctask->data_count left to copy from in progress Data-In
811 * buf_left left to copy from in progress buffer
814 iscsi_ctask_copy(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
815 void *buf, int buf_size, int offset)
817 int buf_left = buf_size - (conn->data_copied + offset);
818 int size = min(conn->in.copy, buf_left);
821 size = min(size, ctask->data_count);
823 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
824 size, conn->in.offset, conn->in.copied);
827 BUG_ON(ctask->sent + size > ctask->total_length);
829 rc = skb_copy_bits(conn->in.skb, conn->in.offset,
830 (char*)buf + (offset + conn->data_copied), size);
831 /* must fit into skb->len */
834 conn->in.offset += size;
835 conn->in.copy -= size;
836 conn->in.copied += size;
837 conn->data_copied += size;
839 ctask->data_count -= size;
841 BUG_ON(conn->in.copy < 0);
842 BUG_ON(ctask->data_count < 0);
844 if (buf_size != (conn->data_copied + offset)) {
845 if (!ctask->data_count) {
846 BUG_ON(buf_size - conn->data_copied < 0);
847 /* done with this PDU */
848 return buf_size - conn->data_copied;
853 /* done with this buffer or with both - PDU and buffer */
854 conn->data_copied = 0;
859 * iscsi_tcp_copy - copy skb bits to the destanation buffer
860 * @conn: iscsi connection
861 * @buf: buffer to copy to
862 * @buf_size: number of bytes to copy
865 * The function calls skb_copy_bits() and updates per-connection
869 iscsi_tcp_copy(struct iscsi_conn *conn, void *buf, int buf_size)
871 int buf_left = buf_size - conn->data_copied;
872 int size = min(conn->in.copy, buf_left);
875 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
876 size, conn->in.offset, conn->data_copied);
879 rc = skb_copy_bits(conn->in.skb, conn->in.offset,
880 (char*)buf + conn->data_copied, size);
883 conn->in.offset += size;
884 conn->in.copy -= size;
885 conn->in.copied += size;
886 conn->data_copied += size;
888 if (buf_size != conn->data_copied)
895 partial_sg_digest_update(struct iscsi_conn *conn, struct scatterlist *sg,
896 int offset, int length)
898 struct scatterlist temp;
900 memcpy(&temp, sg, sizeof(struct scatterlist));
901 temp.offset = offset;
902 temp.length = length;
903 crypto_digest_update(conn->data_rx_tfm, &temp, 1);
907 iscsi_recv_digest_update(struct iscsi_conn *conn, char* buf, int len)
909 struct scatterlist tmp;
911 sg_init_one(&tmp, buf, len);
912 crypto_digest_update(conn->data_rx_tfm, &tmp, 1);
915 static int iscsi_scsi_data_in(struct iscsi_conn *conn)
917 struct iscsi_cmd_task *ctask = conn->in.ctask;
918 struct scsi_cmnd *sc = ctask->sc;
919 struct scatterlist *sg;
920 int i, offset, rc = 0;
922 BUG_ON((void*)ctask != sc->SCp.ptr);
925 * copying Data-In into the Scsi_Cmnd
928 i = ctask->data_count;
929 rc = iscsi_ctask_copy(conn, ctask, sc->request_buffer,
930 sc->request_bufflen, ctask->data_offset);
933 if (conn->datadgst_en)
934 iscsi_recv_digest_update(conn, sc->request_buffer, i);
939 offset = ctask->data_offset;
940 sg = sc->request_buffer;
942 if (ctask->data_offset)
943 for (i = 0; i < ctask->sg_count; i++)
944 offset -= sg[i].length;
945 /* we've passed through partial sg*/
949 for (i = ctask->sg_count; i < sc->use_sg; i++) {
952 dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
953 rc = iscsi_ctask_copy(conn, ctask, dest + sg[i].offset,
954 sg[i].length, offset);
955 kunmap_atomic(dest, KM_SOFTIRQ0);
957 /* continue with the next SKB/PDU */
960 if (conn->datadgst_en) {
962 crypto_digest_update(conn->data_rx_tfm,
965 partial_sg_digest_update(conn, &sg[i],
966 sg[i].offset + offset,
967 sg[i].length - offset);
973 if (!ctask->data_count) {
974 if (rc && conn->datadgst_en)
976 * data-in is complete, but buffer not...
978 partial_sg_digest_update(conn, &sg[i],
979 sg[i].offset, sg[i].length-rc);
987 BUG_ON(ctask->data_count);
990 /* check for non-exceptional status */
991 if (conn->in.flags & ISCSI_FLAG_DATA_STATUS) {
992 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
993 (long)sc, sc->result, ctask->itt);
994 conn->scsirsp_pdus_cnt++;
995 iscsi_ctask_cleanup(conn, ctask);
1003 iscsi_data_recv(struct iscsi_conn *conn)
1005 struct iscsi_session *session = conn->session;
1008 switch(conn->in.opcode) {
1009 case ISCSI_OP_SCSI_DATA_IN:
1010 rc = iscsi_scsi_data_in(conn);
1012 case ISCSI_OP_SCSI_CMD_RSP: {
1015 * copying the entire Data Segment.
1017 if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
1025 conn->in.hdr = &conn->hdr;
1026 conn->senselen = (conn->data[0] << 8) | conn->data[1];
1027 rc = iscsi_cmd_rsp(conn, conn->in.ctask);
1028 if (!rc && conn->datadgst_en)
1029 iscsi_recv_digest_update(conn, conn->data,
1033 case ISCSI_OP_TEXT_RSP:
1034 case ISCSI_OP_LOGIN_RSP:
1035 case ISCSI_OP_NOOP_IN: {
1036 struct iscsi_mgmt_task *mtask = NULL;
1038 if (conn->in.itt != ISCSI_RESERVED_TAG)
1039 mtask = (struct iscsi_mgmt_task *)
1040 session->mgmt_cmds[conn->in.itt -
1041 ISCSI_MGMT_ITT_OFFSET];
1044 * Collect data segment to the connection's data
1047 if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
1052 rc = iscsi_recv_pdu(iscsi_handle(conn), conn->in.hdr,
1053 conn->data, conn->in.datalen);
1055 if (!rc && conn->datadgst_en &&
1056 conn->in.opcode != ISCSI_OP_LOGIN_RSP)
1057 iscsi_recv_digest_update(conn, conn->data,
1060 if (mtask && conn->login_mtask != mtask) {
1061 spin_lock(&session->lock);
1062 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1064 spin_unlock(&session->lock);
1068 case ISCSI_OP_ASYNC_EVENT:
1069 case ISCSI_OP_REJECT:
1078 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
1079 * @rd_desc: read descriptor
1080 * @skb: socket buffer
1081 * @offset: offset in skb
1082 * @len: skb->len - offset
1085 iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
1086 unsigned int offset, size_t len)
1089 struct iscsi_conn *conn = rd_desc->arg.data;
1091 char pad[ISCSI_PAD_LEN];
1092 struct scatterlist sg;
1095 * Save current SKB and its offset in the corresponding
1096 * connection context.
1098 conn->in.copy = skb->len - offset;
1099 conn->in.offset = offset;
1101 conn->in.len = conn->in.copy;
1102 BUG_ON(conn->in.copy <= 0);
1103 debug_tcp("in %d bytes\n", conn->in.copy);
1106 conn->in.copied = 0;
1109 if (unlikely(conn->suspend_rx)) {
1110 debug_tcp("conn %d Rx suspended!\n", conn->id);
1114 if (conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
1115 conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
1116 rc = iscsi_hdr_extract(conn);
1121 iscsi_conn_failure(conn, rc);
1127 * Verify and process incoming PDU header.
1129 rc = iscsi_hdr_recv(conn);
1130 if (!rc && conn->in.datalen) {
1131 if (conn->datadgst_en &&
1132 conn->in.opcode != ISCSI_OP_LOGIN_RSP) {
1133 BUG_ON(!conn->data_rx_tfm);
1134 crypto_digest_init(conn->data_rx_tfm);
1136 conn->in_progress = IN_PROGRESS_DATA_RECV;
1138 iscsi_conn_failure(conn, rc);
1143 if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
1144 uint32_t recv_digest;
1145 debug_tcp("extra data_recv offset %d copy %d\n",
1146 conn->in.offset, conn->in.copy);
1147 skb_copy_bits(conn->in.skb, conn->in.offset,
1149 conn->in.offset += 4;
1151 if (recv_digest != conn->in.datadgst) {
1152 debug_tcp("iscsi_tcp: data digest error!"
1153 "0x%x != 0x%x\n", recv_digest,
1155 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1158 debug_tcp("iscsi_tcp: data digest match!"
1159 "0x%x == 0x%x\n", recv_digest,
1161 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1165 if (conn->in_progress == IN_PROGRESS_DATA_RECV && conn->in.copy) {
1167 debug_tcp("data_recv offset %d copy %d\n",
1168 conn->in.offset, conn->in.copy);
1170 rc = iscsi_data_recv(conn);
1172 if (rc == -EAGAIN) {
1173 rd_desc->count = conn->in.datalen -
1174 conn->in.ctask->data_count;
1177 iscsi_conn_failure(conn, rc);
1180 conn->in.copy -= conn->in.padding;
1181 conn->in.offset += conn->in.padding;
1182 if (conn->datadgst_en &&
1183 conn->in.opcode != ISCSI_OP_LOGIN_RSP) {
1184 if (conn->in.padding) {
1185 debug_tcp("padding -> %d\n", conn->in.padding);
1186 memset(pad, 0, conn->in.padding);
1187 sg_init_one(&sg, pad, conn->in.padding);
1188 crypto_digest_update(conn->data_rx_tfm, &sg, 1);
1190 crypto_digest_final(conn->data_rx_tfm,
1191 (u8 *) & conn->in.datadgst);
1192 debug_tcp("rx digest 0x%x\n", conn->in.datadgst);
1193 conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
1195 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1198 debug_tcp("f, processed %d from out of %d padding %d\n",
1199 conn->in.offset - offset, (int)len, conn->in.padding);
1200 BUG_ON(conn->in.offset - offset > len);
1202 if (conn->in.offset - offset != len) {
1203 debug_tcp("continue to process %d bytes\n",
1204 (int)len - (conn->in.offset - offset));
1209 processed = conn->in.offset - offset;
1210 BUG_ON(processed == 0);
1214 processed = conn->in.offset - offset;
1215 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
1216 processed, (int)len, (int)rd_desc->count);
1217 BUG_ON(processed == 0);
1218 BUG_ON(processed > len);
1220 conn->rxdata_octets += processed;
1225 iscsi_tcp_data_ready(struct sock *sk, int flag)
1227 struct iscsi_conn *conn = sk->sk_user_data;
1228 read_descriptor_t rd_desc;
1230 read_lock(&sk->sk_callback_lock);
1232 /* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */
1233 rd_desc.arg.data = conn;
1235 tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
1237 read_unlock(&sk->sk_callback_lock);
1241 iscsi_tcp_state_change(struct sock *sk)
1243 struct iscsi_conn *conn;
1244 struct iscsi_session *session;
1245 void (*old_state_change)(struct sock *);
1247 read_lock(&sk->sk_callback_lock);
1249 conn = (struct iscsi_conn*)sk->sk_user_data;
1250 session = conn->session;
1252 if ((sk->sk_state == TCP_CLOSE_WAIT ||
1253 sk->sk_state == TCP_CLOSE) &&
1254 !atomic_read(&sk->sk_rmem_alloc)) {
1255 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1256 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1259 old_state_change = conn->old_state_change;
1261 read_unlock(&sk->sk_callback_lock);
1263 old_state_change(sk);
1267 * iscsi_write_space - Called when more output buffer space is available
1268 * @sk: socket space is available for
1271 iscsi_write_space(struct sock *sk)
1273 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
1274 conn->old_write_space(sk);
1275 debug_tcp("iscsi_write_space: cid %d\n", conn->id);
1276 clear_bit(SUSPEND_BIT, &conn->suspend_tx);
1277 schedule_work(&conn->xmitwork);
1281 iscsi_conn_set_callbacks(struct iscsi_conn *conn)
1283 struct sock *sk = conn->sock->sk;
1285 /* assign new callbacks */
1286 write_lock_bh(&sk->sk_callback_lock);
1287 sk->sk_user_data = conn;
1288 conn->old_data_ready = sk->sk_data_ready;
1289 conn->old_state_change = sk->sk_state_change;
1290 conn->old_write_space = sk->sk_write_space;
1291 sk->sk_data_ready = iscsi_tcp_data_ready;
1292 sk->sk_state_change = iscsi_tcp_state_change;
1293 sk->sk_write_space = iscsi_write_space;
1294 write_unlock_bh(&sk->sk_callback_lock);
1298 iscsi_conn_restore_callbacks(struct iscsi_conn *conn)
1300 struct sock *sk = conn->sock->sk;
1302 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1303 write_lock_bh(&sk->sk_callback_lock);
1304 sk->sk_user_data = NULL;
1305 sk->sk_data_ready = conn->old_data_ready;
1306 sk->sk_state_change = conn->old_state_change;
1307 sk->sk_write_space = conn->old_write_space;
1308 sk->sk_no_check = 0;
1309 write_unlock_bh(&sk->sk_callback_lock);
1313 * iscsi_send - generic send routine
1314 * @sk: kernel's socket
1315 * @buf: buffer to write from
1316 * @size: actual size to write
1317 * @flags: socket's flags
1320 * depending on buffer will use tcp_sendpage() or tcp_sendmsg().
1321 * buf->sg.offset == -1 tells us that buffer is non S/G and forces
1322 * to use tcp_sendmsg().
1325 iscsi_send(struct socket *sk, struct iscsi_buf *buf, int size, int flags)
1329 if ((int)buf->sg.offset >= 0) {
1330 int offset = buf->sg.offset + buf->sent;
1333 res = sk->ops->sendpage(sk, buf->sg.page, offset, size, flags);
1337 buf->iov.iov_base = iscsi_buf_iov_base(buf);
1338 buf->iov.iov_len = size;
1340 memset(&msg, 0, sizeof(struct msghdr));
1343 res = kernel_sendmsg(sk, &msg, &buf->iov, 1, size);
1350 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1351 * @conn: iscsi connection
1352 * @buf: buffer to write from
1353 * @datalen: lenght of data to be sent after the header
1359 iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
1361 struct socket *sk = conn->sock;
1362 int flags = 0; /* MSG_DONTWAIT; */
1365 size = buf->sg.length - buf->sent;
1366 BUG_ON(buf->sent + size > buf->sg.length);
1367 if (buf->sent + size != buf->sg.length || datalen)
1370 res = iscsi_send(sk, buf, size, flags);
1371 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
1373 conn->txdata_octets += res;
1378 } else if (res == -EAGAIN) {
1379 conn->sendpage_failures_cnt++;
1380 set_bit(SUSPEND_BIT, &conn->suspend_tx);
1381 } else if (res == -EPIPE)
1382 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1388 * iscsi_sendpage - send one page of iSCSI Data-Out.
1389 * @conn: iscsi connection
1390 * @buf: buffer to write from
1391 * @count: remaining data
1392 * @sent: number of bytes sent
1398 iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
1399 int *count, int *sent)
1401 struct socket *sk = conn->sock;
1402 int flags = 0; /* MSG_DONTWAIT; */
1405 size = buf->sg.length - buf->sent;
1406 BUG_ON(buf->sent + size > buf->sg.length);
1409 if (buf->sent + size != buf->sg.length || *count != size)
1412 res = iscsi_send(sk, buf, size, flags);
1413 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1414 size, buf->sent, *count, *sent, res);
1416 conn->txdata_octets += res;
1423 } else if (res == -EAGAIN) {
1424 conn->sendpage_failures_cnt++;
1425 set_bit(SUSPEND_BIT, &conn->suspend_tx);
1426 } else if (res == -EPIPE)
1427 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1433 iscsi_data_digest_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1435 BUG_ON(!conn->data_tx_tfm);
1436 crypto_digest_init(conn->data_tx_tfm);
1437 ctask->digest_count = 4;
1441 iscsi_buf_data_digest_update(struct iscsi_conn *conn, struct iscsi_buf *buf)
1443 struct scatterlist sg;
1445 if (buf->sg.offset != -1)
1446 crypto_digest_update(conn->data_tx_tfm, &buf->sg, 1);
1448 sg_init_one(&sg, (char *)buf->sg.page, buf->sg.length);
1449 crypto_digest_update(conn->data_tx_tfm, &sg, 1);
1454 iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1455 struct iscsi_buf *buf, uint32_t *digest, int final)
1461 crypto_digest_final(conn->data_tx_tfm, (u8*)digest);
1463 iscsi_buf_init_virt(buf, (char*)digest, 4);
1464 rc = iscsi_sendpage(conn, buf, &ctask->digest_count, &sent);
1466 ctask->datadigest = *digest;
1467 ctask->xmstate |= XMSTATE_DATA_DIGEST;
1469 ctask->digest_count = 4;
1474 * iscsi_solicit_data_cont - initialize next Data-Out
1475 * @conn: iscsi connection
1476 * @ctask: scsi command task
1478 * @left: bytes left to transfer
1481 * Initialize next Data-Out within this R2T sequence and continue
1482 * to process next Scatter-Gather element(if any) of this SCSI command.
1484 * Called under connection lock.
1487 iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1488 struct iscsi_r2t_info *r2t, int left)
1490 struct iscsi_data *hdr;
1491 struct iscsi_data_task *dtask;
1492 struct scsi_cmnd *sc = ctask->sc;
1495 dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
1498 memset(hdr, 0, sizeof(struct iscsi_data));
1499 hdr->ttt = r2t->ttt;
1500 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
1501 r2t->solicit_datasn++;
1502 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1503 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
1504 hdr->itt = ctask->hdr.itt;
1505 hdr->exp_statsn = r2t->exp_statsn;
1506 new_offset = r2t->data_offset + r2t->sent;
1507 hdr->offset = cpu_to_be32(new_offset);
1508 if (left > conn->max_xmit_dlength) {
1509 hton24(hdr->dlength, conn->max_xmit_dlength);
1510 r2t->data_count = conn->max_xmit_dlength;
1512 hton24(hdr->dlength, left);
1513 r2t->data_count = left;
1514 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1516 conn->dataout_pdus_cnt++;
1518 iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
1519 sizeof(struct iscsi_hdr));
1523 if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) {
1524 BUG_ON(ctask->bad_sg == r2t->sg);
1525 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1528 iscsi_buf_init_iov(&ctask->sendbuf,
1529 (char*)sc->request_buffer + new_offset,
1532 list_add(&dtask->item, &ctask->dataqueue);
1536 iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1538 struct iscsi_data *hdr;
1539 struct iscsi_data_task *dtask;
1541 dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
1544 memset(hdr, 0, sizeof(struct iscsi_data));
1545 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
1546 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
1547 ctask->unsol_datasn++;
1548 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1549 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
1550 hdr->itt = ctask->hdr.itt;
1551 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
1552 hdr->offset = cpu_to_be32(ctask->total_length -
1553 ctask->r2t_data_count -
1554 ctask->unsol_count);
1555 if (ctask->unsol_count > conn->max_xmit_dlength) {
1556 hton24(hdr->dlength, conn->max_xmit_dlength);
1557 ctask->data_count = conn->max_xmit_dlength;
1560 hton24(hdr->dlength, ctask->unsol_count);
1561 ctask->data_count = ctask->unsol_count;
1562 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1565 iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr,
1566 sizeof(struct iscsi_hdr));
1568 list_add(&dtask->item, &ctask->dataqueue);
1570 ctask->dtask = dtask;
1574 * iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1575 * @conn: iscsi connection
1576 * @ctask: scsi command task
1580 iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1581 struct scsi_cmnd *sc)
1583 struct iscsi_session *session = conn->session;
1585 BUG_ON(__kfifo_len(ctask->r2tqueue));
1589 ctask->hdr.opcode = ISCSI_OP_SCSI_CMD;
1590 ctask->hdr.flags = ISCSI_ATTR_SIMPLE;
1591 int_to_scsilun(sc->device->lun, (struct scsi_lun *)ctask->hdr.lun);
1592 ctask->hdr.itt = ctask->itt | (conn->id << CID_SHIFT) |
1593 (session->age << AGE_SHIFT);
1594 ctask->hdr.data_length = cpu_to_be32(sc->request_bufflen);
1595 ctask->hdr.cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++;
1596 ctask->hdr.exp_statsn = cpu_to_be32(conn->exp_statsn);
1597 memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len);
1598 memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
1600 ctask->mtask = NULL;
1602 ctask->sg_count = 0;
1604 ctask->total_length = sc->request_bufflen;
1606 if (sc->sc_data_direction == DMA_TO_DEVICE) {
1607 ctask->exp_r2tsn = 0;
1608 ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE;
1609 BUG_ON(ctask->total_length == 0);
1611 struct scatterlist *sg = sc->request_buffer;
1613 iscsi_buf_init_sg(&ctask->sendbuf,
1614 &sg[ctask->sg_count++]);
1616 ctask->bad_sg = sg + sc->use_sg;
1618 iscsi_buf_init_iov(&ctask->sendbuf, sc->request_buffer,
1619 sc->request_bufflen);
1625 * imm_count bytes to be sent right after
1628 * unsol_count bytes(as Data-Out) to be sent
1629 * without R2T ack right after
1632 * r2t_data_count bytes to be sent via R2T ack's
1634 * pad_count bytes to be sent as zero-padding
1636 ctask->imm_count = 0;
1637 ctask->unsol_count = 0;
1638 ctask->unsol_datasn = 0;
1639 ctask->xmstate = XMSTATE_W_HDR;
1640 /* calculate write padding */
1641 ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1);
1642 if (ctask->pad_count) {
1643 ctask->pad_count = ISCSI_PAD_LEN - ctask->pad_count;
1644 debug_scsi("write padding %d bytes\n",
1646 ctask->xmstate |= XMSTATE_W_PAD;
1648 if (session->imm_data_en) {
1649 if (ctask->total_length >= session->first_burst)
1650 ctask->imm_count = min(session->first_burst,
1651 conn->max_xmit_dlength);
1653 ctask->imm_count = min(ctask->total_length,
1654 conn->max_xmit_dlength);
1655 hton24(ctask->hdr.dlength, ctask->imm_count);
1656 ctask->xmstate |= XMSTATE_IMM_DATA;
1658 zero_data(ctask->hdr.dlength);
1660 if (!session->initial_r2t_en)
1661 ctask->unsol_count = min(session->first_burst,
1662 ctask->total_length) - ctask->imm_count;
1663 if (!ctask->unsol_count)
1664 /* No unsolicit Data-Out's */
1665 ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
1667 ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
1669 ctask->r2t_data_count = ctask->total_length -
1673 debug_scsi("cmd [itt %x total %d imm %d imm_data %d "
1675 ctask->itt, ctask->total_length, ctask->imm_count,
1676 ctask->unsol_count, ctask->r2t_data_count);
1678 ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
1679 if (sc->sc_data_direction == DMA_FROM_DEVICE)
1680 ctask->hdr.flags |= ISCSI_FLAG_CMD_READ;
1682 ctask->xmstate = XMSTATE_R_HDR;
1683 zero_data(ctask->hdr.dlength);
1686 iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr,
1687 sizeof(struct iscsi_hdr));
1688 conn->scsicmd_pdus_cnt++;
1692 * iscsi_mtask_xmit - xmit management(immediate) task
1693 * @conn: iscsi connection
1694 * @mtask: task management task
1697 * The function can return -EAGAIN in which case caller must
1698 * call it again later, or recover. '0' return code means successful
1701 * Management xmit state machine consists of two states:
1702 * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
1703 * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
1706 iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
1709 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1710 conn->id, mtask->xmstate, mtask->itt);
1712 if (mtask->xmstate & XMSTATE_IMM_HDR) {
1713 mtask->xmstate &= ~XMSTATE_IMM_HDR;
1714 if (mtask->data_count)
1715 mtask->xmstate |= XMSTATE_IMM_DATA;
1716 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
1717 conn->stop_stage != STOP_CONN_RECOVER &&
1719 iscsi_hdr_digest(conn, &mtask->headbuf,
1720 (u8*)mtask->hdrext);
1721 if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) {
1722 mtask->xmstate |= XMSTATE_IMM_HDR;
1723 if (mtask->data_count)
1724 mtask->xmstate &= ~XMSTATE_IMM_DATA;
1729 if (mtask->xmstate & XMSTATE_IMM_DATA) {
1730 BUG_ON(!mtask->data_count);
1731 mtask->xmstate &= ~XMSTATE_IMM_DATA;
1732 /* FIXME: implement.
1733 * Virtual buffer could be spreaded across multiple pages...
1736 if (iscsi_sendpage(conn, &mtask->sendbuf,
1737 &mtask->data_count, &mtask->sent)) {
1738 mtask->xmstate |= XMSTATE_IMM_DATA;
1741 } while (mtask->data_count);
1744 BUG_ON(mtask->xmstate != XMSTATE_IDLE);
1749 handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1751 ctask->xmstate &= ~XMSTATE_R_HDR;
1752 if (conn->hdrdgst_en)
1753 iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
1754 if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) {
1755 BUG_ON(ctask->xmstate != XMSTATE_IDLE);
1756 return 0; /* wait for Data-In */
1758 ctask->xmstate |= XMSTATE_R_HDR;
1763 handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1765 ctask->xmstate &= ~XMSTATE_W_HDR;
1766 if (conn->hdrdgst_en)
1767 iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
1768 if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) {
1769 ctask->xmstate |= XMSTATE_W_HDR;
1776 handle_xmstate_data_digest(struct iscsi_conn *conn,
1777 struct iscsi_cmd_task *ctask)
1779 ctask->xmstate &= ~XMSTATE_DATA_DIGEST;
1780 debug_tcp("resent data digest 0x%x\n", ctask->datadigest);
1781 if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
1782 &ctask->datadigest, 0)) {
1783 ctask->xmstate |= XMSTATE_DATA_DIGEST;
1784 debug_tcp("resent data digest 0x%x fail!\n",
1792 handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1794 BUG_ON(!ctask->imm_count);
1795 ctask->xmstate &= ~XMSTATE_IMM_DATA;
1797 if (conn->datadgst_en) {
1798 iscsi_data_digest_init(conn, ctask);
1799 ctask->immdigest = 0;
1803 if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->imm_count,
1805 ctask->xmstate |= XMSTATE_IMM_DATA;
1806 if (conn->datadgst_en) {
1807 crypto_digest_final(conn->data_tx_tfm,
1808 (u8*)&ctask->immdigest);
1809 debug_tcp("tx imm sendpage fail 0x%x\n",
1814 if (conn->datadgst_en)
1815 iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
1817 if (!ctask->imm_count)
1819 iscsi_buf_init_sg(&ctask->sendbuf,
1820 &ctask->sg[ctask->sg_count++]);
1823 if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
1824 if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
1825 &ctask->immdigest, 1)) {
1826 debug_tcp("sending imm digest 0x%x fail!\n",
1830 debug_tcp("sending imm digest 0x%x\n", ctask->immdigest);
1837 handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1839 struct iscsi_data_task *dtask;
1841 ctask->xmstate |= XMSTATE_UNS_DATA;
1842 if (ctask->xmstate & XMSTATE_UNS_INIT) {
1843 iscsi_unsolicit_data_init(conn, ctask);
1844 BUG_ON(!ctask->dtask);
1845 dtask = ctask->dtask;
1846 if (conn->hdrdgst_en)
1847 iscsi_hdr_digest(conn, &ctask->headbuf,
1848 (u8*)dtask->hdrext);
1849 ctask->xmstate &= ~XMSTATE_UNS_INIT;
1851 if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) {
1852 ctask->xmstate &= ~XMSTATE_UNS_DATA;
1853 ctask->xmstate |= XMSTATE_UNS_HDR;
1857 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1858 ctask->itt, ctask->unsol_count, ctask->sent);
1863 handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1865 struct iscsi_data_task *dtask = ctask->dtask;
1867 BUG_ON(!ctask->data_count);
1868 ctask->xmstate &= ~XMSTATE_UNS_DATA;
1870 if (conn->datadgst_en) {
1871 iscsi_data_digest_init(conn, ctask);
1876 int start = ctask->sent;
1878 if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->data_count,
1880 ctask->unsol_count -= ctask->sent - start;
1881 ctask->xmstate |= XMSTATE_UNS_DATA;
1882 /* will continue with this ctask later.. */
1883 if (conn->datadgst_en) {
1884 crypto_digest_final(conn->data_tx_tfm,
1885 (u8 *)&dtask->digest);
1886 debug_tcp("tx uns data fail 0x%x\n",
1892 BUG_ON(ctask->sent > ctask->total_length);
1893 ctask->unsol_count -= ctask->sent - start;
1896 * XXX:we may run here with un-initial sendbuf.
1899 if (conn->datadgst_en && ctask->sent - start > 0)
1900 iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
1902 if (!ctask->data_count)
1904 iscsi_buf_init_sg(&ctask->sendbuf,
1905 &ctask->sg[ctask->sg_count++]);
1907 BUG_ON(ctask->unsol_count < 0);
1910 * Done with the Data-Out. Next, check if we need
1911 * to send another unsolicited Data-Out.
1913 if (ctask->unsol_count) {
1914 if (conn->datadgst_en) {
1915 if (iscsi_digest_final_send(conn, ctask,
1917 &dtask->digest, 1)) {
1918 debug_tcp("send uns digest 0x%x fail\n",
1922 debug_tcp("sending uns digest 0x%x, more uns\n",
1925 ctask->xmstate |= XMSTATE_UNS_INIT;
1929 if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
1930 if (iscsi_digest_final_send(conn, ctask,
1932 &dtask->digest, 1)) {
1933 debug_tcp("send last uns digest 0x%x fail\n",
1937 debug_tcp("sending uns digest 0x%x\n",dtask->digest);
1944 handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1946 struct iscsi_session *session = conn->session;
1947 struct iscsi_r2t_info *r2t = ctask->r2t;
1948 struct iscsi_data_task *dtask = r2t->dtask;
1951 ctask->xmstate &= ~XMSTATE_SOL_DATA;
1952 ctask->dtask = dtask;
1954 if (conn->datadgst_en) {
1955 iscsi_data_digest_init(conn, ctask);
1960 * send Data-Out whitnin this R2T sequence.
1962 if (!r2t->data_count)
1965 if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) {
1966 ctask->xmstate |= XMSTATE_SOL_DATA;
1967 /* will continue with this ctask later.. */
1968 if (conn->datadgst_en) {
1969 crypto_digest_final(conn->data_tx_tfm,
1970 (u8 *)&dtask->digest);
1971 debug_tcp("r2t data send fail 0x%x\n", dtask->digest);
1976 BUG_ON(r2t->data_count < 0);
1977 if (conn->datadgst_en)
1978 iscsi_buf_data_digest_update(conn, &r2t->sendbuf);
1980 if (r2t->data_count) {
1981 BUG_ON(ctask->sc->use_sg == 0);
1982 if (!iscsi_buf_left(&r2t->sendbuf)) {
1983 BUG_ON(ctask->bad_sg == r2t->sg);
1984 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1992 * Done with this Data-Out. Next, check if we have
1993 * to send another Data-Out for this R2T.
1995 BUG_ON(r2t->data_length - r2t->sent < 0);
1996 left = r2t->data_length - r2t->sent;
1998 if (conn->datadgst_en) {
1999 if (iscsi_digest_final_send(conn, ctask,
2001 &dtask->digest, 1)) {
2002 debug_tcp("send r2t data digest 0x%x"
2003 "fail\n", dtask->digest);
2006 debug_tcp("r2t data send digest 0x%x\n",
2009 iscsi_solicit_data_cont(conn, ctask, r2t, left);
2010 ctask->xmstate |= XMSTATE_SOL_DATA;
2011 ctask->xmstate &= ~XMSTATE_SOL_HDR;
2016 * Done with this R2T. Check if there are more
2017 * outstanding R2Ts ready to be processed.
2019 BUG_ON(ctask->r2t_data_count - r2t->data_length < 0);
2020 if (conn->datadgst_en) {
2021 if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf,
2022 &dtask->digest, 1)) {
2023 debug_tcp("send last r2t data digest 0x%x"
2024 "fail\n", dtask->digest);
2027 debug_tcp("r2t done dout digest 0x%x\n", dtask->digest);
2030 ctask->r2t_data_count -= r2t->data_length;
2032 spin_lock_bh(&session->lock);
2033 __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
2034 spin_unlock_bh(&session->lock);
2035 if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
2037 ctask->xmstate |= XMSTATE_SOL_DATA;
2038 ctask->xmstate &= ~XMSTATE_SOL_HDR;
2046 handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
2048 struct iscsi_data_task *dtask = ctask->dtask;
2051 ctask->xmstate &= ~XMSTATE_W_PAD;
2052 iscsi_buf_init_virt(&ctask->sendbuf, (char*)&ctask->pad,
2054 if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->pad_count, &sent)) {
2055 ctask->xmstate |= XMSTATE_W_PAD;
2059 if (conn->datadgst_en) {
2060 iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
2063 if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
2064 &ctask->immdigest, 1)) {
2065 debug_tcp("send padding digest 0x%x"
2066 "fail!\n", ctask->immdigest);
2069 debug_tcp("done with padding, digest 0x%x\n",
2072 if (iscsi_digest_final_send(conn, ctask,
2074 &dtask->digest, 1)) {
2075 debug_tcp("send padding digest 0x%x"
2076 "fail\n", dtask->digest);
2079 debug_tcp("done with padding, digest 0x%x\n",
2088 iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
2092 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
2093 conn->id, ctask->xmstate, ctask->itt);
2096 * serialize with TMF AbortTask
2101 if (ctask->xmstate & XMSTATE_R_HDR) {
2102 rc = handle_xmstate_r_hdr(conn, ctask);
2106 if (ctask->xmstate & XMSTATE_W_HDR) {
2107 rc = handle_xmstate_w_hdr(conn, ctask);
2112 /* XXX: for data digest xmit recover */
2113 if (ctask->xmstate & XMSTATE_DATA_DIGEST) {
2114 rc = handle_xmstate_data_digest(conn, ctask);
2119 if (ctask->xmstate & XMSTATE_IMM_DATA) {
2120 rc = handle_xmstate_imm_data(conn, ctask);
2125 if (ctask->xmstate & XMSTATE_UNS_HDR) {
2126 BUG_ON(!ctask->unsol_count);
2127 ctask->xmstate &= ~XMSTATE_UNS_HDR;
2128 unsolicit_head_again:
2129 rc = handle_xmstate_uns_hdr(conn, ctask);
2134 if (ctask->xmstate & XMSTATE_UNS_DATA) {
2135 rc = handle_xmstate_uns_data(conn, ctask);
2137 goto unsolicit_head_again;
2143 if (ctask->xmstate & XMSTATE_SOL_HDR) {
2144 struct iscsi_r2t_info *r2t;
2146 ctask->xmstate &= ~XMSTATE_SOL_HDR;
2147 ctask->xmstate |= XMSTATE_SOL_DATA;
2149 __kfifo_get(ctask->r2tqueue, (void*)&ctask->r2t,
2153 if (conn->hdrdgst_en)
2154 iscsi_hdr_digest(conn, &r2t->headbuf,
2155 (u8*)r2t->dtask->hdrext);
2156 if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) {
2157 ctask->xmstate &= ~XMSTATE_SOL_DATA;
2158 ctask->xmstate |= XMSTATE_SOL_HDR;
2162 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
2163 r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
2167 if (ctask->xmstate & XMSTATE_SOL_DATA) {
2168 rc = handle_xmstate_sol_data(conn, ctask);
2170 goto solicit_head_again;
2177 * Last thing to check is whether we need to send write
2178 * padding. Note that we check for xmstate equality, not just the bit.
2180 if (ctask->xmstate == XMSTATE_W_PAD)
2181 rc = handle_xmstate_w_pad(conn, ctask);
2187 * iscsi_data_xmit - xmit any command into the scheduled connection
2188 * @conn: iscsi connection
2191 * The function can return -EAGAIN in which case the caller must
2192 * re-schedule it again later or recover. '0' return code means
2196 iscsi_data_xmit(struct iscsi_conn *conn)
2198 if (unlikely(conn->suspend_tx)) {
2199 debug_tcp("conn %d Tx suspended!\n", conn->id);
2204 * Transmit in the following order:
2206 * 1) un-finished xmit (ctask or mtask)
2207 * 2) immediate control PDUs
2210 * 5) non-immediate control PDUs
2212 * No need to lock around __kfifo_get as long as
2213 * there's one producer and one consumer.
2216 BUG_ON(conn->ctask && conn->mtask);
2219 if (iscsi_ctask_xmit(conn, conn->ctask))
2221 /* done with this in-progress ctask */
2225 if (iscsi_mtask_xmit(conn, conn->mtask))
2227 /* done with this in-progress mtask */
2231 /* process immediate first */
2232 if (unlikely(__kfifo_len(conn->immqueue))) {
2233 struct iscsi_session *session = conn->session;
2234 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
2236 if (iscsi_mtask_xmit(conn, conn->mtask))
2239 if (conn->mtask->hdr.itt ==
2240 cpu_to_be32(ISCSI_RESERVED_TAG)) {
2241 spin_lock_bh(&session->lock);
2242 __kfifo_put(session->mgmtpool.queue,
2243 (void*)&conn->mtask, sizeof(void*));
2244 spin_unlock_bh(&session->lock);
2247 /* done with this mtask */
2251 /* process write queue */
2252 while (__kfifo_get(conn->writequeue, (void*)&conn->ctask,
2254 if (iscsi_ctask_xmit(conn, conn->ctask))
2258 /* process command queue */
2259 while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask,
2261 if (iscsi_ctask_xmit(conn, conn->ctask))
2264 /* done with this ctask */
2267 /* process the rest control plane PDUs, if any */
2268 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
2269 struct iscsi_session *session = conn->session;
2271 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
2273 if (iscsi_mtask_xmit(conn, conn->mtask))
2276 if (conn->mtask->hdr.itt ==
2277 cpu_to_be32(ISCSI_RESERVED_TAG)) {
2278 spin_lock_bh(&session->lock);
2279 __kfifo_put(session->mgmtpool.queue,
2280 (void*)&conn->mtask,
2282 spin_unlock_bh(&session->lock);
2285 /* done with this mtask */
2292 if (unlikely(conn->suspend_tx))
2299 iscsi_xmitworker(void *data)
2301 struct iscsi_conn *conn = data;
2304 * serialize Xmit worker on a per-connection basis.
2306 down(&conn->xmitsema);
2307 if (iscsi_data_xmit(conn))
2308 schedule_work(&conn->xmitwork);
2309 up(&conn->xmitsema);
2312 #define FAILURE_BAD_HOST 1
2313 #define FAILURE_SESSION_FAILED 2
2314 #define FAILURE_SESSION_FREED 3
2315 #define FAILURE_WINDOW_CLOSED 4
2316 #define FAILURE_SESSION_TERMINATE 5
2319 iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
2321 struct Scsi_Host *host;
2323 struct iscsi_session *session;
2324 struct iscsi_conn *conn = NULL;
2325 struct iscsi_cmd_task *ctask = NULL;
2327 sc->scsi_done = done;
2330 host = sc->device->host;
2331 session = iscsi_hostdata(host->hostdata);
2332 BUG_ON(host != session->host);
2334 spin_lock(&session->lock);
2336 if (session->state != ISCSI_STATE_LOGGED_IN) {
2337 if (session->state == ISCSI_STATE_FAILED) {
2338 reason = FAILURE_SESSION_FAILED;
2340 } else if (session->state == ISCSI_STATE_TERMINATE) {
2341 reason = FAILURE_SESSION_TERMINATE;
2344 reason = FAILURE_SESSION_FREED;
2349 * Check for iSCSI window and take care of CmdSN wrap-around
2351 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
2352 reason = FAILURE_WINDOW_CLOSED;
2356 conn = session->leadconn;
2358 __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
2361 sc->SCp.phase = session->age;
2362 sc->SCp.ptr = (char*)ctask;
2363 iscsi_cmd_init(conn, ctask, sc);
2365 __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
2367 "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
2368 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
2369 conn->id, (long)sc, ctask->itt, sc->request_bufflen,
2370 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
2371 spin_unlock(&session->lock);
2373 if (!in_interrupt() && !down_trylock(&conn->xmitsema)) {
2374 spin_unlock_irq(host->host_lock);
2375 if (iscsi_data_xmit(conn))
2376 schedule_work(&conn->xmitwork);
2377 up(&conn->xmitsema);
2378 spin_lock_irq(host->host_lock);
2380 schedule_work(&conn->xmitwork);
2385 spin_unlock(&session->lock);
2386 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
2387 return SCSI_MLQUEUE_HOST_BUSY;
2390 spin_unlock(&session->lock);
2391 printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n",
2392 sc->cmnd[0], reason);
2393 sc->sense_buffer[0] = 0x70;
2394 sc->sense_buffer[2] = NOT_READY;
2395 sc->sense_buffer[7] = 0x6;
2396 sc->sense_buffer[12] = 0x08;
2397 sc->sense_buffer[13] = 0x00;
2398 sc->result = (DID_NO_CONNECT << 16);
2399 sc->resid = sc->request_bufflen;
2405 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
2409 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
2414 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
2415 if (q->pool == NULL) {
2420 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
2422 if (q->queue == ERR_PTR(-ENOMEM)) {
2428 for (i = 0; i < max; i++) {
2429 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
2430 if (q->pool[i] == NULL) {
2433 for (j = 0; j < i; j++)
2436 kfifo_free(q->queue);
2441 memset(q->pool[i], 0, item_size);
2442 (*items)[i] = q->pool[i];
2443 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
2449 iscsi_pool_free(struct iscsi_queue *q, void **items)
2453 for (i = 0; i < q->max; i++)
2459 static iscsi_connh_t
2460 iscsi_conn_create(iscsi_sessionh_t sessionh, uint32_t conn_idx)
2462 struct iscsi_session *session = iscsi_ptr(sessionh);
2463 struct iscsi_conn *conn = NULL;
2465 conn = kmalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
2467 goto conn_alloc_fail;
2468 memset(conn, 0, sizeof(struct iscsi_conn));
2470 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2471 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
2472 conn->id = conn_idx;
2473 conn->exp_statsn = 0;
2474 conn->tmabort_state = TMABORT_INITIAL;
2476 /* initial operational parameters */
2477 conn->hdr_size = sizeof(struct iscsi_hdr);
2478 conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
2479 conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
2481 spin_lock_init(&conn->lock);
2483 /* initialize general xmit PDU commands queue */
2484 conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*),
2486 if (conn->xmitqueue == ERR_PTR(-ENOMEM))
2487 goto xmitqueue_alloc_fail;
2489 /* initialize write response PDU commands queue */
2490 conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*),
2492 if (conn->writequeue == ERR_PTR(-ENOMEM))
2493 goto writequeue_alloc_fail;
2495 /* initialize general immediate & non-immediate PDU commands queue */
2496 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
2498 if (conn->immqueue == ERR_PTR(-ENOMEM))
2499 goto immqueue_alloc_fail;
2501 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
2503 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
2504 goto mgmtqueue_alloc_fail;
2506 INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
2508 /* allocate login_mtask used for the login/text sequences */
2509 spin_lock_bh(&session->lock);
2510 if (!__kfifo_get(session->mgmtpool.queue,
2511 (void*)&conn->login_mtask,
2513 spin_unlock_bh(&session->lock);
2514 goto login_mtask_alloc_fail;
2516 spin_unlock_bh(&session->lock);
2518 /* allocate initial PDU receive place holder */
2519 if (conn->data_size <= PAGE_SIZE)
2520 conn->data = kmalloc(conn->data_size, GFP_KERNEL);
2522 conn->data = (void*)__get_free_pages(GFP_KERNEL,
2523 get_order(conn->data_size));
2525 goto max_recv_dlenght_alloc_fail;
2527 init_timer(&conn->tmabort_timer);
2528 init_MUTEX(&conn->xmitsema);
2529 init_waitqueue_head(&conn->ehwait);
2531 return iscsi_handle(conn);
2533 max_recv_dlenght_alloc_fail:
2534 spin_lock_bh(&session->lock);
2535 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
2537 spin_unlock_bh(&session->lock);
2538 login_mtask_alloc_fail:
2539 kfifo_free(conn->mgmtqueue);
2540 mgmtqueue_alloc_fail:
2541 kfifo_free(conn->immqueue);
2542 immqueue_alloc_fail:
2543 kfifo_free(conn->writequeue);
2544 writequeue_alloc_fail:
2545 kfifo_free(conn->xmitqueue);
2546 xmitqueue_alloc_fail:
2549 return iscsi_handle(NULL);
2553 iscsi_conn_destroy(iscsi_connh_t connh)
2555 struct iscsi_conn *conn = iscsi_ptr(connh);
2556 struct iscsi_session *session = conn->session;
2558 down(&conn->xmitsema);
2559 set_bit(SUSPEND_BIT, &conn->suspend_tx);
2560 if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE && conn->sock) {
2561 struct sock *sk = conn->sock->sk;
2564 * conn_start() has never been called!
2565 * need to cleanup the socket.
2567 write_lock_bh(&sk->sk_callback_lock);
2568 set_bit(SUSPEND_BIT, &conn->suspend_rx);
2569 write_unlock_bh(&sk->sk_callback_lock);
2571 sock_hold(conn->sock->sk);
2572 iscsi_conn_restore_callbacks(conn);
2573 sock_put(conn->sock->sk);
2574 sock_release(conn->sock);
2578 spin_lock_bh(&session->lock);
2579 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2580 if (session->leadconn == conn) {
2582 * leading connection? then give up on recovery.
2584 session->state = ISCSI_STATE_TERMINATE;
2585 wake_up(&conn->ehwait);
2587 spin_unlock_bh(&session->lock);
2589 up(&conn->xmitsema);
2592 * Block until all in-progress commands for this connection
2596 spin_lock_bh(&conn->lock);
2597 if (!session->host->host_busy) { /* OK for ERL == 0 */
2598 spin_unlock_bh(&conn->lock);
2601 spin_unlock_bh(&conn->lock);
2602 msleep_interruptible(500);
2603 printk("conn_destroy(): host_busy %d host_failed %d\n",
2604 session->host->host_busy, session->host->host_failed);
2606 * force eh_abort() to unblock
2608 wake_up(&conn->ehwait);
2611 /* now free crypto */
2612 if (conn->hdrdgst_en || conn->datadgst_en) {
2614 crypto_free_tfm(conn->tx_tfm);
2616 crypto_free_tfm(conn->rx_tfm);
2617 if (conn->data_tx_tfm)
2618 crypto_free_tfm(conn->data_tx_tfm);
2619 if (conn->data_rx_tfm)
2620 crypto_free_tfm(conn->data_rx_tfm);
2623 /* free conn->data, size = MaxRecvDataSegmentLength */
2624 if (conn->data_size <= PAGE_SIZE)
2627 free_pages((unsigned long)conn->data,
2628 get_order(conn->data_size));
2630 spin_lock_bh(&session->lock);
2631 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
2633 list_del(&conn->item);
2634 if (list_empty(&session->connections))
2635 session->leadconn = NULL;
2636 if (session->leadconn && session->leadconn == conn)
2637 session->leadconn = container_of(session->connections.next,
2638 struct iscsi_conn, item);
2640 if (session->leadconn == NULL)
2641 /* none connections exits.. reset sequencing */
2642 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
2643 spin_unlock_bh(&session->lock);
2645 kfifo_free(conn->xmitqueue);
2646 kfifo_free(conn->writequeue);
2647 kfifo_free(conn->immqueue);
2648 kfifo_free(conn->mgmtqueue);
2653 iscsi_conn_bind(iscsi_sessionh_t sessionh, iscsi_connh_t connh,
2654 uint32_t transport_fd, int is_leading)
2656 struct iscsi_session *session = iscsi_ptr(sessionh);
2657 struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = iscsi_ptr(connh);
2659 struct socket *sock;
2662 /* lookup for existing socket */
2663 sock = sockfd_lookup(transport_fd, &err);
2665 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
2669 /* lookup for existing connection */
2670 spin_lock_bh(&session->lock);
2671 list_for_each_entry(tmp, &session->connections, item) {
2673 if (conn->c_stage != ISCSI_CONN_STOPPED ||
2674 conn->stop_stage == STOP_CONN_TERM) {
2675 printk(KERN_ERR "iscsi_tcp: can't bind "
2676 "non-stopped connection (%d:%d)\n",
2677 conn->c_stage, conn->stop_stage);
2678 spin_unlock_bh(&session->lock);
2685 /* bind new iSCSI connection to session */
2686 conn->session = session;
2688 list_add(&conn->item, &session->connections);
2690 spin_unlock_bh(&session->lock);
2692 if (conn->stop_stage != STOP_CONN_SUSPEND) {
2693 /* bind iSCSI connection and socket */
2696 /* setup Socket parameters */
2699 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
2700 sk->sk_allocation = GFP_ATOMIC;
2702 /* FIXME: disable Nagle's algorithm */
2705 * Intercept TCP callbacks for sendfile like receive
2708 iscsi_conn_set_callbacks(conn);
2711 * set receive state machine into initial state
2713 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
2717 session->leadconn = conn;
2720 * Unblock xmitworker(), Login Phase will pass through.
2722 clear_bit(SUSPEND_BIT, &conn->suspend_rx);
2723 clear_bit(SUSPEND_BIT, &conn->suspend_tx);
2729 iscsi_conn_start(iscsi_connh_t connh)
2731 struct iscsi_conn *conn = iscsi_ptr(connh);
2732 struct iscsi_session *session = conn->session;
2735 /* FF phase warming up... */
2737 if (session == NULL) {
2738 printk(KERN_ERR "iscsi_tcp: can't start unbound connection\n");
2742 sk = conn->sock->sk;
2744 write_lock_bh(&sk->sk_callback_lock);
2745 spin_lock_bh(&session->lock);
2746 conn->c_stage = ISCSI_CONN_STARTED;
2747 session->state = ISCSI_STATE_LOGGED_IN;
2749 switch(conn->stop_stage) {
2750 case STOP_CONN_RECOVER:
2752 * unblock eh_abort() if it is blocked. re-try all
2753 * commands after successful recovery
2755 session->conn_cnt++;
2756 conn->stop_stage = 0;
2757 conn->tmabort_state = TMABORT_INITIAL;
2759 wake_up(&conn->ehwait);
2761 case STOP_CONN_TERM:
2762 session->conn_cnt++;
2763 conn->stop_stage = 0;
2765 case STOP_CONN_SUSPEND:
2766 conn->stop_stage = 0;
2767 clear_bit(SUSPEND_BIT, &conn->suspend_rx);
2768 clear_bit(SUSPEND_BIT, &conn->suspend_tx);
2773 spin_unlock_bh(&session->lock);
2774 write_unlock_bh(&sk->sk_callback_lock);
2780 iscsi_conn_stop(iscsi_connh_t connh, int flag)
2782 struct iscsi_conn *conn = iscsi_ptr(connh);
2783 struct iscsi_session *session = conn->session;
2785 unsigned long flags;
2787 BUG_ON(!conn->sock);
2788 sk = conn->sock->sk;
2789 write_lock_bh(&sk->sk_callback_lock);
2790 set_bit(SUSPEND_BIT, &conn->suspend_rx);
2791 write_unlock_bh(&sk->sk_callback_lock);
2793 down(&conn->xmitsema);
2795 spin_lock_irqsave(session->host->host_lock, flags);
2796 spin_lock(&session->lock);
2797 conn->stop_stage = flag;
2798 conn->c_stage = ISCSI_CONN_STOPPED;
2799 set_bit(SUSPEND_BIT, &conn->suspend_tx);
2801 if (flag != STOP_CONN_SUSPEND)
2802 session->conn_cnt--;
2804 if (session->conn_cnt == 0 || session->leadconn == conn)
2805 session->state = ISCSI_STATE_FAILED;
2807 spin_unlock(&session->lock);
2808 spin_unlock_irqrestore(session->host->host_lock, flags);
2810 if (flag == STOP_CONN_TERM || flag == STOP_CONN_RECOVER) {
2811 struct iscsi_cmd_task *ctask;
2812 struct iscsi_mgmt_task *mtask;
2815 * Socket must go now.
2817 sock_hold(conn->sock->sk);
2818 iscsi_conn_restore_callbacks(conn);
2819 sock_put(conn->sock->sk);
2822 * flush xmit queues.
2824 spin_lock_bh(&session->lock);
2825 while (__kfifo_get(conn->writequeue, (void*)&ctask,
2827 __kfifo_get(conn->xmitqueue, (void*)&ctask,
2829 struct iscsi_r2t_info *r2t;
2832 * flush ctask's r2t queues
2834 while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
2836 __kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
2839 spin_unlock_bh(&session->lock);
2841 iscsi_ctask_cleanup(conn, ctask);
2843 spin_lock_bh(&session->lock);
2846 while (__kfifo_get(conn->immqueue, (void*)&mtask,
2848 __kfifo_get(conn->mgmtqueue, (void*)&mtask,
2850 __kfifo_put(session->mgmtpool.queue,
2851 (void*)&mtask, sizeof(void*));
2854 spin_unlock_bh(&session->lock);
2857 * release socket only after we stopped data_xmit()
2858 * activity and flushed all outstandings
2860 sock_release(conn->sock);
2864 * for connection level recovery we should not calculate
2865 * header digest. conn->hdr_size used for optimization
2866 * in hdr_extract() and will be re-negotiated at
2869 if (flag == STOP_CONN_RECOVER)
2870 conn->hdr_size = sizeof(struct iscsi_hdr);
2872 up(&conn->xmitsema);
2876 iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
2877 char *data, uint32_t data_size)
2879 struct iscsi_session *session = conn->session;
2880 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
2881 struct iscsi_mgmt_task *mtask;
2883 spin_lock_bh(&session->lock);
2884 if (session->state == ISCSI_STATE_TERMINATE) {
2885 spin_unlock_bh(&session->lock);
2888 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
2889 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
2891 * Login and Text are sent serially, in
2892 * request-followed-by-response sequence.
2893 * Same mtask can be used. Same ITT must be used.
2894 * Note that login_mtask is preallocated at conn_create().
2896 mtask = conn->login_mtask;
2898 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
2899 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
2901 if (!__kfifo_get(session->mgmtpool.queue,
2902 (void*)&mtask, sizeof(void*))) {
2903 spin_unlock_bh(&session->lock);
2909 * pre-format CmdSN and ExpStatSN for outgoing PDU.
2911 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
2912 hdr->itt = mtask->itt | (conn->id << CID_SHIFT) |
2913 (session->age << AGE_SHIFT);
2914 nop->cmdsn = cpu_to_be32(session->cmdsn);
2915 if (conn->c_stage == ISCSI_CONN_STARTED &&
2916 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2919 /* do not advance CmdSN */
2920 nop->cmdsn = cpu_to_be32(session->cmdsn);
2922 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
2924 memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr));
2926 iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
2927 sizeof(struct iscsi_hdr));
2929 spin_unlock_bh(&session->lock);
2932 memcpy(mtask->data, data, data_size);
2933 mtask->data_count = data_size;
2935 mtask->data_count = 0;
2937 mtask->xmstate = XMSTATE_IMM_HDR;
2939 if (mtask->data_count) {
2940 iscsi_buf_init_iov(&mtask->sendbuf, (char*)mtask->data,
2944 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
2945 hdr->opcode, hdr->itt, data_size);
2948 * since send_pdu() could be called at least from two contexts,
2949 * we need to serialize __kfifo_put, so we don't have to take
2950 * additional lock on fast data-path
2952 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
2953 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
2955 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
2957 schedule_work(&conn->xmitwork);
2963 iscsi_eh_host_reset(struct scsi_cmnd *sc)
2965 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
2966 struct iscsi_conn *conn = ctask->conn;
2967 struct iscsi_session *session = conn->session;
2969 spin_lock_bh(&session->lock);
2970 if (session->state == ISCSI_STATE_TERMINATE) {
2971 debug_scsi("failing host reset: session terminated "
2972 "[CID %d age %d]", conn->id, session->age);
2973 spin_unlock_bh(&session->lock);
2976 spin_unlock_bh(&session->lock);
2978 debug_scsi("failing connection CID %d due to SCSI host reset "
2979 "[itt 0x%x age %d]", conn->id, ctask->itt,
2981 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2987 iscsi_tmabort_timedout(unsigned long data)
2989 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
2990 struct iscsi_conn *conn = ctask->conn;
2991 struct iscsi_session *session = conn->session;
2993 spin_lock(&session->lock);
2994 if (conn->tmabort_state == TMABORT_INITIAL) {
2995 __kfifo_put(session->mgmtpool.queue,
2996 (void*)&ctask->mtask, sizeof(void*));
2997 conn->tmabort_state = TMABORT_TIMEDOUT;
2998 debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n",
2999 (long)ctask->sc, ctask->itt);
3000 /* unblock eh_abort() */
3001 wake_up(&conn->ehwait);
3003 spin_unlock(&session->lock);
3007 iscsi_eh_abort(struct scsi_cmnd *sc)
3010 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
3011 struct iscsi_conn *conn = ctask->conn;
3012 struct iscsi_session *session = conn->session;
3014 conn->eh_abort_cnt++;
3015 debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
3018 * two cases for ERL=0 here:
3020 * 1) connection-level failure;
3021 * 2) recovery due protocol error;
3023 down(&conn->xmitsema);
3024 spin_lock_bh(&session->lock);
3025 if (session->state != ISCSI_STATE_LOGGED_IN) {
3026 if (session->state == ISCSI_STATE_TERMINATE) {
3027 spin_unlock_bh(&session->lock);
3028 up(&conn->xmitsema);
3031 spin_unlock_bh(&session->lock);
3033 struct iscsi_tm *hdr = &conn->tmhdr;
3036 * Still LOGGED_IN...
3039 if (!ctask->sc || sc->SCp.phase != session->age) {
3041 * 1) ctask completed before time out. But session
3042 * is still ok => Happy Retry.
3043 * 2) session was re-open during time out of ctask.
3045 spin_unlock_bh(&session->lock);
3046 up(&conn->xmitsema);
3049 conn->tmabort_state = TMABORT_INITIAL;
3050 spin_unlock_bh(&session->lock);
3053 * ctask timed out but session is OK
3054 * ERL=0 requires task mgmt abort to be issued on each
3055 * failed command. requests must be serialized.
3057 memset(hdr, 0, sizeof(struct iscsi_tm));
3058 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
3059 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
3060 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3061 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
3062 hdr->rtt = ctask->hdr.itt;
3063 hdr->refcmdsn = ctask->hdr.cmdsn;
3065 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
3068 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
3069 debug_scsi("abort sent failure [itt 0x%x]", ctask->itt);
3071 struct iscsi_r2t_info *r2t;
3074 * TMF abort vs. TMF response race logic
3076 spin_lock_bh(&session->lock);
3077 ctask->mtask = (struct iscsi_mgmt_task *)
3078 session->mgmt_cmds[(hdr->itt & ITT_MASK) -
3079 ISCSI_MGMT_ITT_OFFSET];
3081 * have to flush r2tqueue to avoid r2t leaks
3083 while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
3085 __kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
3088 if (conn->tmabort_state == TMABORT_INITIAL) {
3089 conn->tmfcmd_pdus_cnt++;
3090 conn->tmabort_timer.expires = 3*HZ + jiffies;
3091 conn->tmabort_timer.function =
3092 iscsi_tmabort_timedout;
3093 conn->tmabort_timer.data = (unsigned long)ctask;
3094 add_timer(&conn->tmabort_timer);
3095 debug_scsi("abort sent [itt 0x%x]", ctask->itt);
3098 conn->tmabort_state == TMABORT_SUCCESS) {
3099 conn->tmabort_state = TMABORT_INITIAL;
3100 spin_unlock_bh(&session->lock);
3101 up(&conn->xmitsema);
3104 conn->tmabort_state = TMABORT_INITIAL;
3105 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
3107 spin_unlock_bh(&session->lock);
3110 up(&conn->xmitsema);
3114 * block eh thread until:
3116 * 1) abort response;
3118 * 3) session re-opened;
3119 * 4) session terminated;
3122 int p_state = session->state;
3124 rc = wait_event_interruptible(conn->ehwait,
3125 (p_state == ISCSI_STATE_LOGGED_IN ?
3126 (session->state == ISCSI_STATE_TERMINATE ||
3127 conn->tmabort_state != TMABORT_INITIAL) :
3128 (session->state == ISCSI_STATE_TERMINATE ||
3129 session->state == ISCSI_STATE_LOGGED_IN)));
3132 session->state = ISCSI_STATE_TERMINATE;
3136 if (signal_pending(current))
3137 flush_signals(current);
3139 if (session->state == ISCSI_STATE_TERMINATE)
3142 spin_lock_bh(&session->lock);
3143 if (sc->SCp.phase == session->age &&
3144 (conn->tmabort_state == TMABORT_TIMEDOUT ||
3145 conn->tmabort_state == TMABORT_FAILED)) {
3146 conn->tmabort_state = TMABORT_INITIAL;
3149 * ctask completed before tmf abort response or
3151 * But session is still ok => Happy Retry.
3153 spin_unlock_bh(&session->lock);
3156 spin_unlock_bh(&session->lock);
3157 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
3160 spin_unlock_bh(&session->lock);
3165 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
3170 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
3174 del_timer_sync(&conn->tmabort_timer);
3176 down(&conn->xmitsema);
3178 struct sock *sk = conn->sock->sk;
3180 write_lock_bh(&sk->sk_callback_lock);
3181 iscsi_ctask_cleanup(conn, ctask);
3182 write_unlock_bh(&sk->sk_callback_lock);
3184 up(&conn->xmitsema);
3189 iscsi_r2tpool_alloc(struct iscsi_session *session)
3195 * initialize per-task: R2T pool and xmit queue
3197 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
3198 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
3201 * pre-allocated x4 as much r2ts to handle race when
3202 * target acks DataOut faster than we data_xmit() queues
3203 * could replenish r2tqueue.
3207 if (iscsi_pool_init(&ctask->r2tpool, session->max_r2t * 4,
3208 (void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) {
3209 goto r2t_alloc_fail;
3212 /* R2T xmit queue */
3213 ctask->r2tqueue = kfifo_alloc(
3214 session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
3215 if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
3216 iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
3217 goto r2t_alloc_fail;
3222 * Data-Out PDU's within R2T-sequence can be quite big;
3225 ctask->datapool = mempool_create(ISCSI_DTASK_DEFAULT_MAX,
3226 mempool_alloc_slab, mempool_free_slab, taskcache);
3227 if (ctask->datapool == NULL) {
3228 kfifo_free(ctask->r2tqueue);
3229 iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
3230 goto r2t_alloc_fail;
3232 INIT_LIST_HEAD(&ctask->dataqueue);
3238 for (i = 0; i < cmd_i; i++) {
3239 mempool_destroy(session->cmds[i]->datapool);
3240 kfifo_free(session->cmds[i]->r2tqueue);
3241 iscsi_pool_free(&session->cmds[i]->r2tpool,
3242 (void**)session->cmds[i]->r2ts);
3248 iscsi_r2tpool_free(struct iscsi_session *session)
3252 for (i = 0; i < session->cmds_max; i++) {
3253 mempool_destroy(session->cmds[i]->datapool);
3254 kfifo_free(session->cmds[i]->r2tqueue);
3255 iscsi_pool_free(&session->cmds[i]->r2tpool,
3256 (void**)session->cmds[i]->r2ts);
3260 static struct scsi_host_template iscsi_sht = {
3261 .name = "iSCSI Initiator over TCP/IP, v."
3263 .queuecommand = iscsi_queuecommand,
3264 .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
3265 .sg_tablesize = ISCSI_SG_TABLESIZE,
3266 .cmd_per_lun = ISCSI_CMD_PER_LUN,
3267 .eh_abort_handler = iscsi_eh_abort,
3268 .eh_host_reset_handler = iscsi_eh_host_reset,
3269 .use_clustering = DISABLE_CLUSTERING,
3270 .proc_name = "iscsi_tcp",
3274 static iscsi_sessionh_t
3275 iscsi_session_create(uint32_t initial_cmdsn, struct Scsi_Host *host)
3278 struct iscsi_session *session;
3280 session = iscsi_hostdata(host->hostdata);
3281 memset(session, 0, sizeof(struct iscsi_session));
3283 session->host = host;
3284 session->id = host->host_no;
3285 session->state = ISCSI_STATE_LOGGED_IN;
3286 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
3287 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
3288 session->cmdsn = initial_cmdsn;
3289 session->exp_cmdsn = initial_cmdsn + 1;
3290 session->max_cmdsn = initial_cmdsn + 1;
3291 session->max_r2t = 1;
3293 /* initialize SCSI PDU commands pool */
3294 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
3295 (void***)&session->cmds, sizeof(struct iscsi_cmd_task)))
3296 goto cmdpool_alloc_fail;
3298 /* pre-format cmds pool with ITT */
3299 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++)
3300 session->cmds[cmd_i]->itt = cmd_i;
3302 spin_lock_init(&session->lock);
3303 INIT_LIST_HEAD(&session->connections);
3305 /* initialize immediate command pool */
3306 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
3307 (void***)&session->mgmt_cmds, sizeof(struct iscsi_mgmt_task)))
3308 goto mgmtpool_alloc_fail;
3311 /* pre-format immediate cmds pool with ITT */
3312 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
3313 session->mgmt_cmds[cmd_i]->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
3314 session->mgmt_cmds[cmd_i]->data = kmalloc(
3315 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
3316 if (!session->mgmt_cmds[cmd_i]->data) {
3319 for (j = 0; j < cmd_i; j++)
3320 kfree(session->mgmt_cmds[j]->data);
3321 goto immdata_alloc_fail;
3325 if (iscsi_r2tpool_alloc(session))
3326 goto r2tpool_alloc_fail;
3328 return iscsi_handle(session);
3331 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
3332 kfree(session->mgmt_cmds[cmd_i]->data);
3333 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
3335 mgmtpool_alloc_fail:
3336 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
3338 return iscsi_handle(NULL);
3342 iscsi_session_destroy(iscsi_sessionh_t sessionh)
3345 struct iscsi_data_task *dtask, *n;
3346 struct iscsi_session *session = iscsi_ptr(sessionh);
3348 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
3349 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
3350 list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
3351 list_del(&dtask->item);
3352 mempool_free(dtask, ctask->datapool);
3356 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
3357 kfree(session->mgmt_cmds[cmd_i]->data);
3359 iscsi_r2tpool_free(session);
3360 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
3361 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
3365 iscsi_conn_set_param(iscsi_connh_t connh, enum iscsi_param param,
3368 struct iscsi_conn *conn = iscsi_ptr(connh);
3369 struct iscsi_session *session = conn->session;
3371 spin_lock_bh(&session->lock);
3372 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
3373 conn->stop_stage != STOP_CONN_RECOVER) {
3374 printk(KERN_ERR "iscsi_tcp: can not change parameter [%d]\n",
3376 spin_unlock_bh(&session->lock);
3379 spin_unlock_bh(&session->lock);
3382 case ISCSI_PARAM_MAX_RECV_DLENGTH: {
3383 char *saveptr = conn->data;
3384 int flags = GFP_KERNEL;
3386 if (conn->data_size >= value) {
3387 conn->max_recv_dlength = value;
3391 spin_lock_bh(&session->lock);
3392 if (conn->stop_stage == STOP_CONN_RECOVER)
3394 spin_unlock_bh(&session->lock);
3396 if (value <= PAGE_SIZE)
3397 conn->data = kmalloc(value, flags);
3399 conn->data = (void*)__get_free_pages(flags,
3401 if (conn->data == NULL) {
3402 conn->data = saveptr;
3405 if (conn->data_size <= PAGE_SIZE)
3408 free_pages((unsigned long)saveptr,
3409 get_order(conn->data_size));
3410 conn->max_recv_dlength = value;
3411 conn->data_size = value;
3414 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3415 conn->max_xmit_dlength = value;
3417 case ISCSI_PARAM_HDRDGST_EN:
3418 conn->hdrdgst_en = value;
3419 conn->hdr_size = sizeof(struct iscsi_hdr);
3420 if (conn->hdrdgst_en) {
3421 conn->hdr_size += sizeof(__u32);
3423 conn->tx_tfm = crypto_alloc_tfm("crc32c", 0);
3427 conn->rx_tfm = crypto_alloc_tfm("crc32c", 0);
3428 if (!conn->rx_tfm) {
3429 crypto_free_tfm(conn->tx_tfm);
3434 crypto_free_tfm(conn->tx_tfm);
3436 crypto_free_tfm(conn->rx_tfm);
3439 case ISCSI_PARAM_DATADGST_EN:
3440 conn->datadgst_en = value;
3441 if (conn->datadgst_en) {
3442 if (!conn->data_tx_tfm)
3444 crypto_alloc_tfm("crc32c", 0);
3445 if (!conn->data_tx_tfm)
3447 if (!conn->data_rx_tfm)
3449 crypto_alloc_tfm("crc32c", 0);
3450 if (!conn->data_rx_tfm) {
3451 crypto_free_tfm(conn->data_tx_tfm);
3455 if (conn->data_tx_tfm)
3456 crypto_free_tfm(conn->data_tx_tfm);
3457 if (conn->data_rx_tfm)
3458 crypto_free_tfm(conn->data_rx_tfm);
3461 case ISCSI_PARAM_INITIAL_R2T_EN:
3462 session->initial_r2t_en = value;
3464 case ISCSI_PARAM_MAX_R2T:
3465 if (session->max_r2t == roundup_pow_of_two(value))
3467 iscsi_r2tpool_free(session);
3468 session->max_r2t = value;
3469 if (session->max_r2t & (session->max_r2t - 1))
3470 session->max_r2t = roundup_pow_of_two(session->max_r2t);
3471 if (iscsi_r2tpool_alloc(session))
3474 case ISCSI_PARAM_IMM_DATA_EN:
3475 session->imm_data_en = value;
3477 case ISCSI_PARAM_FIRST_BURST:
3478 session->first_burst = value;
3480 case ISCSI_PARAM_MAX_BURST:
3481 session->max_burst = value;
3483 case ISCSI_PARAM_PDU_INORDER_EN:
3484 session->pdu_inorder_en = value;
3486 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3487 session->dataseq_inorder_en = value;
3489 case ISCSI_PARAM_ERL:
3490 session->erl = value;
3492 case ISCSI_PARAM_IFMARKER_EN:
3494 session->ifmarker_en = value;
3496 case ISCSI_PARAM_OFMARKER_EN:
3498 session->ofmarker_en = value;
3508 iscsi_conn_get_param(iscsi_connh_t connh, enum iscsi_param param,
3511 struct iscsi_conn *conn = iscsi_ptr(connh);
3512 struct iscsi_session *session = conn->session;
3515 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3516 *value = conn->max_recv_dlength;
3518 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3519 *value = conn->max_xmit_dlength;
3521 case ISCSI_PARAM_HDRDGST_EN:
3522 *value = conn->hdrdgst_en;
3524 case ISCSI_PARAM_DATADGST_EN:
3525 *value = conn->datadgst_en;
3527 case ISCSI_PARAM_INITIAL_R2T_EN:
3528 *value = session->initial_r2t_en;
3530 case ISCSI_PARAM_MAX_R2T:
3531 *value = session->max_r2t;
3533 case ISCSI_PARAM_IMM_DATA_EN:
3534 *value = session->imm_data_en;
3536 case ISCSI_PARAM_FIRST_BURST:
3537 *value = session->first_burst;
3539 case ISCSI_PARAM_MAX_BURST:
3540 *value = session->max_burst;
3542 case ISCSI_PARAM_PDU_INORDER_EN:
3543 *value = session->pdu_inorder_en;
3545 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3546 *value = session->dataseq_inorder_en;
3548 case ISCSI_PARAM_ERL:
3549 *value = session->erl;
3551 case ISCSI_PARAM_IFMARKER_EN:
3552 *value = session->ifmarker_en;
3554 case ISCSI_PARAM_OFMARKER_EN:
3555 *value = session->ofmarker_en;
3558 return ISCSI_ERR_PARAM_NOT_FOUND;
3565 iscsi_conn_get_stats(iscsi_connh_t connh, struct iscsi_stats *stats)
3567 struct iscsi_conn *conn = iscsi_ptr(connh);
3569 stats->txdata_octets = conn->txdata_octets;
3570 stats->rxdata_octets = conn->rxdata_octets;
3571 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
3572 stats->dataout_pdus = conn->dataout_pdus_cnt;
3573 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
3574 stats->datain_pdus = conn->datain_pdus_cnt;
3575 stats->r2t_pdus = conn->r2t_pdus_cnt;
3576 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
3577 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
3578 stats->custom_length = 3;
3579 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
3580 stats->custom[0].value = conn->sendpage_failures_cnt;
3581 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
3582 stats->custom[1].value = conn->discontiguous_hdr_cnt;
3583 strcpy(stats->custom[2].desc, "eh_abort_cnt");
3584 stats->custom[2].value = conn->eh_abort_cnt;
3588 iscsi_conn_send_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr, char *data,
3591 struct iscsi_conn *conn = iscsi_ptr(connh);
3594 down(&conn->xmitsema);
3595 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
3596 up(&conn->xmitsema);
3601 static struct iscsi_transport iscsi_tcp_transport = {
3602 .owner = THIS_MODULE,
3604 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
3606 .host_template = &iscsi_sht,
3607 .hostdata_size = sizeof(struct iscsi_session),
3609 .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
3610 .create_session = iscsi_session_create,
3611 .destroy_session = iscsi_session_destroy,
3612 .create_conn = iscsi_conn_create,
3613 .bind_conn = iscsi_conn_bind,
3614 .destroy_conn = iscsi_conn_destroy,
3615 .set_param = iscsi_conn_set_param,
3616 .get_param = iscsi_conn_get_param,
3617 .start_conn = iscsi_conn_start,
3618 .stop_conn = iscsi_conn_stop,
3619 .send_pdu = iscsi_conn_send_pdu,
3620 .get_stats = iscsi_conn_get_stats,
3624 iscsi_tcp_init(void)
3628 if (iscsi_max_lun < 1) {
3629 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
3632 iscsi_tcp_transport.max_lun = iscsi_max_lun;
3634 taskcache = kmem_cache_create("iscsi_taskcache",
3635 sizeof(struct iscsi_data_task), 0,
3636 SLAB_HWCACHE_ALIGN | SLAB_NO_REAP, NULL, NULL);
3640 error = iscsi_register_transport(&iscsi_tcp_transport);
3642 kmem_cache_destroy(taskcache);
3648 iscsi_tcp_exit(void)
3650 iscsi_unregister_transport(&iscsi_tcp_transport);
3651 kmem_cache_destroy(taskcache);
3654 module_init(iscsi_tcp_init);
3655 module_exit(iscsi_tcp_exit);