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>
36 #include <linux/mutex.h>
38 #include <scsi/scsi_cmnd.h>
39 #include <scsi/scsi_device.h>
40 #include <scsi/scsi_eh.h>
41 #include <scsi/scsi_request.h>
42 #include <scsi/scsi_tcq.h>
43 #include <scsi/scsi_host.h>
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_transport_iscsi.h>
47 #include "iscsi_tcp.h"
49 MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
50 "Alex Aizman <itn780@yahoo.com>");
51 MODULE_DESCRIPTION("iSCSI/TCP data-path");
52 MODULE_LICENSE("GPL");
53 MODULE_VERSION("0:4.445");
54 /* #define DEBUG_TCP */
55 /* #define DEBUG_SCSI */
59 #define debug_tcp(fmt...) printk(KERN_DEBUG "tcp: " fmt)
61 #define debug_tcp(fmt...)
65 #define debug_scsi(fmt...) printk(KERN_DEBUG "scsi: " fmt)
67 #define debug_scsi(fmt...)
77 #define INVALID_SN_DELTA 0xffff
79 static unsigned int iscsi_max_lun = 512;
80 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
83 static kmem_cache_t *taskcache;
86 iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size)
88 sg_init_one(&ibuf->sg, (u8 *)vbuf, size);
93 iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
95 ibuf->sg.page = (void*)vbuf;
96 ibuf->sg.offset = (unsigned int)-1;
97 ibuf->sg.length = size;
102 iscsi_buf_iov_base(struct iscsi_buf *ibuf)
104 return (char*)ibuf->sg.page + ibuf->sent;
108 iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
111 * Fastpath: sg element fits into single page
113 if (sg->length + sg->offset <= PAGE_SIZE && page_count(sg->page) >= 2) {
114 ibuf->sg.page = sg->page;
115 ibuf->sg.offset = sg->offset;
116 ibuf->sg.length = sg->length;
118 iscsi_buf_init_iov(ibuf, page_address(sg->page), sg->length);
123 iscsi_buf_left(struct iscsi_buf *ibuf)
127 rc = ibuf->sg.length - ibuf->sent;
133 iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
136 crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc);
137 buf->sg.length += sizeof(uint32_t);
141 iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
143 struct iscsi_session *session = conn->session;
146 spin_lock_irqsave(&session->lock, flags);
147 if (session->conn_cnt == 1 || session->leadconn == conn)
148 session->state = ISCSI_STATE_FAILED;
149 spin_unlock_irqrestore(&session->lock, flags);
150 set_bit(SUSPEND_BIT, &conn->suspend_tx);
151 set_bit(SUSPEND_BIT, &conn->suspend_rx);
152 iscsi_conn_error(iscsi_handle(conn), err);
156 iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
158 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
159 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
161 if (max_cmdsn < exp_cmdsn -1 &&
162 max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
163 return ISCSI_ERR_MAX_CMDSN;
164 if (max_cmdsn > session->max_cmdsn ||
165 max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
166 session->max_cmdsn = max_cmdsn;
167 if (exp_cmdsn > session->exp_cmdsn ||
168 exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
169 session->exp_cmdsn = exp_cmdsn;
175 iscsi_hdr_extract(struct iscsi_conn *conn)
177 struct sk_buff *skb = conn->in.skb;
179 if (conn->in.copy >= conn->hdr_size &&
180 conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
182 * Zero-copy PDU Header: using connection context
183 * to store header pointer.
185 if (skb_shinfo(skb)->frag_list == NULL &&
186 !skb_shinfo(skb)->nr_frags)
187 conn->in.hdr = (struct iscsi_hdr *)
188 ((char*)skb->data + conn->in.offset);
190 /* ignoring return code since we checked
192 skb_copy_bits(skb, conn->in.offset,
193 &conn->hdr, conn->hdr_size);
194 conn->in.hdr = &conn->hdr;
196 conn->in.offset += conn->hdr_size;
197 conn->in.copy -= conn->hdr_size;
203 * PDU header scattered across SKB's,
204 * copying it... This'll happen quite rarely.
207 if (conn->in_progress == IN_PROGRESS_WAIT_HEADER)
208 conn->in.hdr_offset = 0;
210 hdr_remains = conn->hdr_size - conn->in.hdr_offset;
211 BUG_ON(hdr_remains <= 0);
213 copylen = min(conn->in.copy, hdr_remains);
214 skb_copy_bits(skb, conn->in.offset,
215 (char*)&conn->hdr + conn->in.hdr_offset, copylen);
217 debug_tcp("PDU gather offset %d bytes %d in.offset %d "
218 "in.copy %d\n", conn->in.hdr_offset, copylen,
219 conn->in.offset, conn->in.copy);
221 conn->in.offset += copylen;
222 conn->in.copy -= copylen;
223 if (copylen < hdr_remains) {
224 conn->in_progress = IN_PROGRESS_HEADER_GATHER;
225 conn->in.hdr_offset += copylen;
228 conn->in.hdr = &conn->hdr;
229 conn->discontiguous_hdr_cnt++;
230 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
237 iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
239 struct scsi_cmnd *sc = ctask->sc;
240 struct iscsi_session *session = conn->session;
242 spin_lock(&session->lock);
244 spin_unlock(&session->lock);
247 if (sc->sc_data_direction == DMA_TO_DEVICE) {
248 struct iscsi_data_task *dtask, *n;
249 /* WRITE: cleanup Data-Out's if any */
250 spin_lock(&conn->lock);
251 list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
252 list_del(&dtask->item);
253 mempool_free(dtask, ctask->datapool);
255 spin_unlock(&conn->lock);
257 ctask->xmstate = XMSTATE_IDLE;
260 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
261 spin_unlock(&session->lock);
265 * iscsi_cmd_rsp - SCSI Command Response processing
266 * @conn: iscsi connection
267 * @ctask: scsi command task
270 iscsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
273 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)conn->in.hdr;
274 struct iscsi_session *session = conn->session;
275 struct scsi_cmnd *sc = ctask->sc;
277 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
279 sc->result = (DID_ERROR << 16);
283 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
285 sc->result = (DID_OK << 16) | rhdr->cmd_status;
287 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
288 sc->result = (DID_ERROR << 16);
292 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION && conn->senselen) {
293 int sensecopy = min(conn->senselen, SCSI_SENSE_BUFFERSIZE);
295 memcpy(sc->sense_buffer, conn->data + 2, sensecopy);
296 debug_scsi("copied %d bytes of sense\n", sensecopy);
299 if (sc->sc_data_direction == DMA_TO_DEVICE)
302 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
303 int res_count = be32_to_cpu(rhdr->residual_count);
305 if (res_count > 0 && res_count <= sc->request_bufflen)
306 sc->resid = res_count;
308 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
309 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
310 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
311 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
312 sc->resid = be32_to_cpu(rhdr->residual_count);
315 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
316 (long)sc, sc->result, ctask->itt);
317 conn->scsirsp_pdus_cnt++;
318 iscsi_ctask_cleanup(conn, ctask);
324 * iscsi_data_rsp - SCSI Data-In Response processing
325 * @conn: iscsi connection
326 * @ctask: scsi command task
329 iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
332 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)conn->in.hdr;
333 struct iscsi_session *session = conn->session;
334 int datasn = be32_to_cpu(rhdr->datasn);
336 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
340 * setup Data-In byte counter (gets decremented..)
342 ctask->data_count = conn->in.datalen;
344 if (conn->in.datalen == 0)
347 if (ctask->datasn != datasn)
348 return ISCSI_ERR_DATASN;
352 ctask->data_offset = be32_to_cpu(rhdr->offset);
353 if (ctask->data_offset + conn->in.datalen > ctask->total_length)
354 return ISCSI_ERR_DATA_OFFSET;
356 if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
357 struct scsi_cmnd *sc = ctask->sc;
359 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
360 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
361 int res_count = be32_to_cpu(rhdr->residual_count);
364 res_count <= sc->request_bufflen) {
365 sc->resid = res_count;
366 sc->result = (DID_OK << 16) | rhdr->cmd_status;
368 sc->result = (DID_BAD_TARGET << 16) |
370 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
371 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
372 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) {
373 sc->resid = be32_to_cpu(rhdr->residual_count);
374 sc->result = (DID_OK << 16) | rhdr->cmd_status;
376 sc->result = (DID_OK << 16) | rhdr->cmd_status;
379 conn->datain_pdus_cnt++;
384 * iscsi_solicit_data_init - initialize first Data-Out
385 * @conn: iscsi connection
386 * @ctask: scsi command task
390 * Initialize first Data-Out within this R2T sequence and finds
391 * proper data_offset within this SCSI command.
393 * This function is called with connection lock taken.
396 iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
397 struct iscsi_r2t_info *r2t)
399 struct iscsi_data *hdr;
400 struct iscsi_data_task *dtask;
401 struct scsi_cmnd *sc = ctask->sc;
403 dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
406 memset(hdr, 0, sizeof(struct iscsi_data));
408 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
409 r2t->solicit_datasn++;
410 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
411 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
412 hdr->itt = ctask->hdr.itt;
413 hdr->exp_statsn = r2t->exp_statsn;
414 hdr->offset = cpu_to_be32(r2t->data_offset);
415 if (r2t->data_length > conn->max_xmit_dlength) {
416 hton24(hdr->dlength, conn->max_xmit_dlength);
417 r2t->data_count = conn->max_xmit_dlength;
420 hton24(hdr->dlength, r2t->data_length);
421 r2t->data_count = r2t->data_length;
422 hdr->flags = ISCSI_FLAG_CMD_FINAL;
424 conn->dataout_pdus_cnt++;
428 iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
429 sizeof(struct iscsi_hdr));
435 struct scatterlist *sg = sc->request_buffer;
438 for (i = 0; i < sc->use_sg; i++, sg += 1) {
439 /* FIXME: prefetch ? */
440 if (sg_count + sg->length > r2t->data_offset) {
445 /* offset within this page */
446 page_offset = r2t->data_offset - sg_count;
448 /* fill in this buffer */
449 iscsi_buf_init_sg(&r2t->sendbuf, sg);
450 r2t->sendbuf.sg.offset += page_offset;
451 r2t->sendbuf.sg.length -= page_offset;
453 /* xmit logic will continue with next one */
457 sg_count += sg->length;
459 BUG_ON(r2t->sg == NULL);
461 iscsi_buf_init_iov(&ctask->sendbuf,
462 (char*)sc->request_buffer + r2t->data_offset,
465 list_add(&dtask->item, &ctask->dataqueue);
469 * iscsi_r2t_rsp - iSCSI R2T Response processing
470 * @conn: iscsi connection
471 * @ctask: scsi command task
474 iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
476 struct iscsi_r2t_info *r2t;
477 struct iscsi_session *session = conn->session;
478 struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)conn->in.hdr;
479 int r2tsn = be32_to_cpu(rhdr->r2tsn);
483 return ISCSI_ERR_AHSLEN;
485 if (conn->in.datalen)
486 return ISCSI_ERR_DATALEN;
488 if (ctask->exp_r2tsn && ctask->exp_r2tsn != r2tsn)
489 return ISCSI_ERR_R2TSN;
491 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
495 /* FIXME: use R2TSN to detect missing R2T */
497 /* fill-in new R2T associated with the task */
498 spin_lock(&session->lock);
499 if (!ctask->sc || ctask->mtask ||
500 session->state != ISCSI_STATE_LOGGED_IN) {
501 printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
502 "recovery...\n", ctask->itt);
503 spin_unlock(&session->lock);
506 rc = __kfifo_get(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
509 r2t->exp_statsn = rhdr->statsn;
510 r2t->data_length = be32_to_cpu(rhdr->data_length);
511 if (r2t->data_length == 0 ||
512 r2t->data_length > session->max_burst) {
513 spin_unlock(&session->lock);
514 return ISCSI_ERR_DATALEN;
517 r2t->data_offset = be32_to_cpu(rhdr->data_offset);
518 if (r2t->data_offset + r2t->data_length > ctask->total_length) {
519 spin_unlock(&session->lock);
520 return ISCSI_ERR_DATALEN;
523 r2t->ttt = rhdr->ttt; /* no flip */
524 r2t->solicit_datasn = 0;
526 iscsi_solicit_data_init(conn, ctask, r2t);
528 ctask->exp_r2tsn = r2tsn + 1;
529 ctask->xmstate |= XMSTATE_SOL_HDR;
530 __kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*));
531 __kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*));
533 schedule_work(&conn->xmitwork);
534 conn->r2t_pdus_cnt++;
535 spin_unlock(&session->lock);
541 iscsi_hdr_recv(struct iscsi_conn *conn)
544 struct iscsi_hdr *hdr;
545 struct iscsi_cmd_task *ctask;
546 struct iscsi_session *session = conn->session;
547 uint32_t cdgst, rdgst = 0;
551 /* verify PDU length */
552 conn->in.datalen = ntoh24(hdr->dlength);
553 if (conn->in.datalen > conn->max_recv_dlength) {
554 printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
555 conn->in.datalen, conn->max_recv_dlength);
556 return ISCSI_ERR_DATALEN;
558 conn->data_copied = 0;
561 conn->in.ahslen = hdr->hlength * 4;
562 conn->in.offset += conn->in.ahslen;
563 conn->in.copy -= conn->in.ahslen;
564 if (conn->in.copy < 0) {
565 printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
566 "%d bytes\n", conn->in.ahslen);
567 return ISCSI_ERR_AHSLEN;
570 /* calculate read padding */
571 conn->in.padding = conn->in.datalen & (ISCSI_PAD_LEN-1);
572 if (conn->in.padding) {
573 conn->in.padding = ISCSI_PAD_LEN - conn->in.padding;
574 debug_scsi("read padding %d bytes\n", conn->in.padding);
577 if (conn->hdrdgst_en) {
578 struct scatterlist sg;
580 sg_init_one(&sg, (u8 *)hdr,
581 sizeof(struct iscsi_hdr) + conn->in.ahslen);
582 crypto_digest_digest(conn->rx_tfm, &sg, 1, (u8 *)&cdgst);
583 rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
585 if (cdgst != rdgst) {
586 printk(KERN_ERR "iscsi_tcp: itt %x: hdrdgst error "
587 "recv 0x%x calc 0x%x\n", conn->in.itt, rdgst,
589 return ISCSI_ERR_HDR_DGST;
593 /* save opcode for later */
594 conn->in.opcode = hdr->opcode & ISCSI_OPCODE_MASK;
596 /* verify itt (itt encoding: age+cid+itt) */
597 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
598 if ((hdr->itt & AGE_MASK) !=
599 (session->age << AGE_SHIFT)) {
600 printk(KERN_ERR "iscsi_tcp: received itt %x expected "
601 "session age (%x)\n", hdr->itt,
602 session->age & AGE_MASK);
603 return ISCSI_ERR_BAD_ITT;
606 if ((hdr->itt & CID_MASK) != (conn->id << CID_SHIFT)) {
607 printk(KERN_ERR "iscsi_tcp: received itt %x, expected "
608 "CID (%x)\n", hdr->itt, conn->id);
609 return ISCSI_ERR_BAD_ITT;
611 conn->in.itt = hdr->itt & ITT_MASK;
613 conn->in.itt = hdr->itt;
615 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
616 hdr->opcode, conn->in.offset, conn->in.copy,
617 conn->in.ahslen, conn->in.datalen);
619 if (conn->in.itt < session->cmds_max) {
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 BUG_ON(!conn->data_rx_tfm);
1133 crypto_digest_init(conn->data_rx_tfm);
1135 conn->in_progress = IN_PROGRESS_DATA_RECV;
1137 iscsi_conn_failure(conn, rc);
1142 if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
1143 uint32_t recv_digest;
1144 debug_tcp("extra data_recv offset %d copy %d\n",
1145 conn->in.offset, conn->in.copy);
1146 skb_copy_bits(conn->in.skb, conn->in.offset,
1148 conn->in.offset += 4;
1150 if (recv_digest != conn->in.datadgst) {
1151 debug_tcp("iscsi_tcp: data digest error!"
1152 "0x%x != 0x%x\n", recv_digest,
1154 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1157 debug_tcp("iscsi_tcp: data digest match!"
1158 "0x%x == 0x%x\n", recv_digest,
1160 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1164 if (conn->in_progress == IN_PROGRESS_DATA_RECV && conn->in.copy) {
1166 debug_tcp("data_recv offset %d copy %d\n",
1167 conn->in.offset, conn->in.copy);
1169 rc = iscsi_data_recv(conn);
1171 if (rc == -EAGAIN) {
1172 rd_desc->count = conn->in.datalen -
1173 conn->in.ctask->data_count;
1176 iscsi_conn_failure(conn, rc);
1179 conn->in.copy -= conn->in.padding;
1180 conn->in.offset += conn->in.padding;
1181 if (conn->datadgst_en) {
1182 if (conn->in.padding) {
1183 debug_tcp("padding -> %d\n", conn->in.padding);
1184 memset(pad, 0, conn->in.padding);
1185 sg_init_one(&sg, pad, conn->in.padding);
1186 crypto_digest_update(conn->data_rx_tfm, &sg, 1);
1188 crypto_digest_final(conn->data_rx_tfm,
1189 (u8 *) & conn->in.datadgst);
1190 debug_tcp("rx digest 0x%x\n", conn->in.datadgst);
1191 conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
1193 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1196 debug_tcp("f, processed %d from out of %d padding %d\n",
1197 conn->in.offset - offset, (int)len, conn->in.padding);
1198 BUG_ON(conn->in.offset - offset > len);
1200 if (conn->in.offset - offset != len) {
1201 debug_tcp("continue to process %d bytes\n",
1202 (int)len - (conn->in.offset - offset));
1207 processed = conn->in.offset - offset;
1208 BUG_ON(processed == 0);
1212 processed = conn->in.offset - offset;
1213 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
1214 processed, (int)len, (int)rd_desc->count);
1215 BUG_ON(processed == 0);
1216 BUG_ON(processed > len);
1218 conn->rxdata_octets += processed;
1223 iscsi_tcp_data_ready(struct sock *sk, int flag)
1225 struct iscsi_conn *conn = sk->sk_user_data;
1226 read_descriptor_t rd_desc;
1228 read_lock(&sk->sk_callback_lock);
1230 /* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */
1231 rd_desc.arg.data = conn;
1233 tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
1235 read_unlock(&sk->sk_callback_lock);
1239 iscsi_tcp_state_change(struct sock *sk)
1241 struct iscsi_conn *conn;
1242 struct iscsi_session *session;
1243 void (*old_state_change)(struct sock *);
1245 read_lock(&sk->sk_callback_lock);
1247 conn = (struct iscsi_conn*)sk->sk_user_data;
1248 session = conn->session;
1250 if ((sk->sk_state == TCP_CLOSE_WAIT ||
1251 sk->sk_state == TCP_CLOSE) &&
1252 !atomic_read(&sk->sk_rmem_alloc)) {
1253 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1254 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1257 old_state_change = conn->old_state_change;
1259 read_unlock(&sk->sk_callback_lock);
1261 old_state_change(sk);
1265 * iscsi_write_space - Called when more output buffer space is available
1266 * @sk: socket space is available for
1269 iscsi_write_space(struct sock *sk)
1271 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
1272 conn->old_write_space(sk);
1273 debug_tcp("iscsi_write_space: cid %d\n", conn->id);
1274 clear_bit(SUSPEND_BIT, &conn->suspend_tx);
1275 schedule_work(&conn->xmitwork);
1279 iscsi_conn_set_callbacks(struct iscsi_conn *conn)
1281 struct sock *sk = conn->sock->sk;
1283 /* assign new callbacks */
1284 write_lock_bh(&sk->sk_callback_lock);
1285 sk->sk_user_data = conn;
1286 conn->old_data_ready = sk->sk_data_ready;
1287 conn->old_state_change = sk->sk_state_change;
1288 conn->old_write_space = sk->sk_write_space;
1289 sk->sk_data_ready = iscsi_tcp_data_ready;
1290 sk->sk_state_change = iscsi_tcp_state_change;
1291 sk->sk_write_space = iscsi_write_space;
1292 write_unlock_bh(&sk->sk_callback_lock);
1296 iscsi_conn_restore_callbacks(struct iscsi_conn *conn)
1298 struct sock *sk = conn->sock->sk;
1300 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1301 write_lock_bh(&sk->sk_callback_lock);
1302 sk->sk_user_data = NULL;
1303 sk->sk_data_ready = conn->old_data_ready;
1304 sk->sk_state_change = conn->old_state_change;
1305 sk->sk_write_space = conn->old_write_space;
1306 sk->sk_no_check = 0;
1307 write_unlock_bh(&sk->sk_callback_lock);
1311 * iscsi_send - generic send routine
1312 * @sk: kernel's socket
1313 * @buf: buffer to write from
1314 * @size: actual size to write
1315 * @flags: socket's flags
1318 * depending on buffer will use tcp_sendpage() or tcp_sendmsg().
1319 * buf->sg.offset == -1 tells us that buffer is non S/G and forces
1320 * to use tcp_sendmsg().
1323 iscsi_send(struct socket *sk, struct iscsi_buf *buf, int size, int flags)
1327 if ((int)buf->sg.offset >= 0) {
1328 int offset = buf->sg.offset + buf->sent;
1331 res = sk->ops->sendpage(sk, buf->sg.page, offset, size, flags);
1335 buf->iov.iov_base = iscsi_buf_iov_base(buf);
1336 buf->iov.iov_len = size;
1338 memset(&msg, 0, sizeof(struct msghdr));
1341 res = kernel_sendmsg(sk, &msg, &buf->iov, 1, size);
1348 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1349 * @conn: iscsi connection
1350 * @buf: buffer to write from
1351 * @datalen: lenght of data to be sent after the header
1357 iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
1359 struct socket *sk = conn->sock;
1360 int flags = 0; /* MSG_DONTWAIT; */
1363 size = buf->sg.length - buf->sent;
1364 BUG_ON(buf->sent + size > buf->sg.length);
1365 if (buf->sent + size != buf->sg.length || datalen)
1368 res = iscsi_send(sk, buf, size, flags);
1369 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
1371 conn->txdata_octets += res;
1376 } else if (res == -EAGAIN) {
1377 conn->sendpage_failures_cnt++;
1378 set_bit(SUSPEND_BIT, &conn->suspend_tx);
1379 } else if (res == -EPIPE)
1380 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1386 * iscsi_sendpage - send one page of iSCSI Data-Out.
1387 * @conn: iscsi connection
1388 * @buf: buffer to write from
1389 * @count: remaining data
1390 * @sent: number of bytes sent
1396 iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
1397 int *count, int *sent)
1399 struct socket *sk = conn->sock;
1400 int flags = 0; /* MSG_DONTWAIT; */
1403 size = buf->sg.length - buf->sent;
1404 BUG_ON(buf->sent + size > buf->sg.length);
1407 if (buf->sent + size != buf->sg.length || *count != size)
1410 res = iscsi_send(sk, buf, size, flags);
1411 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1412 size, buf->sent, *count, *sent, res);
1414 conn->txdata_octets += res;
1421 } else if (res == -EAGAIN) {
1422 conn->sendpage_failures_cnt++;
1423 set_bit(SUSPEND_BIT, &conn->suspend_tx);
1424 } else if (res == -EPIPE)
1425 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1431 iscsi_data_digest_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1433 BUG_ON(!conn->data_tx_tfm);
1434 crypto_digest_init(conn->data_tx_tfm);
1435 ctask->digest_count = 4;
1439 iscsi_buf_data_digest_update(struct iscsi_conn *conn, struct iscsi_buf *buf)
1441 struct scatterlist sg;
1443 if (buf->sg.offset != -1)
1444 crypto_digest_update(conn->data_tx_tfm, &buf->sg, 1);
1446 sg_init_one(&sg, (char *)buf->sg.page, buf->sg.length);
1447 crypto_digest_update(conn->data_tx_tfm, &sg, 1);
1452 iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1453 struct iscsi_buf *buf, uint32_t *digest, int final)
1459 crypto_digest_final(conn->data_tx_tfm, (u8*)digest);
1461 iscsi_buf_init_virt(buf, (char*)digest, 4);
1462 rc = iscsi_sendpage(conn, buf, &ctask->digest_count, &sent);
1464 ctask->datadigest = *digest;
1465 ctask->xmstate |= XMSTATE_DATA_DIGEST;
1467 ctask->digest_count = 4;
1472 * iscsi_solicit_data_cont - initialize next Data-Out
1473 * @conn: iscsi connection
1474 * @ctask: scsi command task
1476 * @left: bytes left to transfer
1479 * Initialize next Data-Out within this R2T sequence and continue
1480 * to process next Scatter-Gather element(if any) of this SCSI command.
1482 * Called under connection lock.
1485 iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1486 struct iscsi_r2t_info *r2t, int left)
1488 struct iscsi_data *hdr;
1489 struct iscsi_data_task *dtask;
1490 struct scsi_cmnd *sc = ctask->sc;
1493 dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
1496 memset(hdr, 0, sizeof(struct iscsi_data));
1497 hdr->ttt = r2t->ttt;
1498 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
1499 r2t->solicit_datasn++;
1500 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1501 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
1502 hdr->itt = ctask->hdr.itt;
1503 hdr->exp_statsn = r2t->exp_statsn;
1504 new_offset = r2t->data_offset + r2t->sent;
1505 hdr->offset = cpu_to_be32(new_offset);
1506 if (left > conn->max_xmit_dlength) {
1507 hton24(hdr->dlength, conn->max_xmit_dlength);
1508 r2t->data_count = conn->max_xmit_dlength;
1510 hton24(hdr->dlength, left);
1511 r2t->data_count = left;
1512 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1514 conn->dataout_pdus_cnt++;
1516 iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
1517 sizeof(struct iscsi_hdr));
1521 if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) {
1522 BUG_ON(ctask->bad_sg == r2t->sg);
1523 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1526 iscsi_buf_init_iov(&ctask->sendbuf,
1527 (char*)sc->request_buffer + new_offset,
1530 list_add(&dtask->item, &ctask->dataqueue);
1534 iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1536 struct iscsi_data *hdr;
1537 struct iscsi_data_task *dtask;
1539 dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
1542 memset(hdr, 0, sizeof(struct iscsi_data));
1543 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
1544 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
1545 ctask->unsol_datasn++;
1546 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1547 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
1548 hdr->itt = ctask->hdr.itt;
1549 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
1550 hdr->offset = cpu_to_be32(ctask->total_length -
1551 ctask->r2t_data_count -
1552 ctask->unsol_count);
1553 if (ctask->unsol_count > conn->max_xmit_dlength) {
1554 hton24(hdr->dlength, conn->max_xmit_dlength);
1555 ctask->data_count = conn->max_xmit_dlength;
1558 hton24(hdr->dlength, ctask->unsol_count);
1559 ctask->data_count = ctask->unsol_count;
1560 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1563 iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr,
1564 sizeof(struct iscsi_hdr));
1566 list_add(&dtask->item, &ctask->dataqueue);
1568 ctask->dtask = dtask;
1572 * iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1573 * @conn: iscsi connection
1574 * @ctask: scsi command task
1578 iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1579 struct scsi_cmnd *sc)
1581 struct iscsi_session *session = conn->session;
1583 BUG_ON(__kfifo_len(ctask->r2tqueue));
1587 ctask->hdr.opcode = ISCSI_OP_SCSI_CMD;
1588 ctask->hdr.flags = ISCSI_ATTR_SIMPLE;
1589 int_to_scsilun(sc->device->lun, (struct scsi_lun *)ctask->hdr.lun);
1590 ctask->hdr.itt = ctask->itt | (conn->id << CID_SHIFT) |
1591 (session->age << AGE_SHIFT);
1592 ctask->hdr.data_length = cpu_to_be32(sc->request_bufflen);
1593 ctask->hdr.cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++;
1594 ctask->hdr.exp_statsn = cpu_to_be32(conn->exp_statsn);
1595 memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len);
1596 memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
1598 ctask->mtask = NULL;
1600 ctask->sg_count = 0;
1602 ctask->total_length = sc->request_bufflen;
1604 if (sc->sc_data_direction == DMA_TO_DEVICE) {
1605 ctask->exp_r2tsn = 0;
1606 ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE;
1607 BUG_ON(ctask->total_length == 0);
1609 struct scatterlist *sg = sc->request_buffer;
1611 iscsi_buf_init_sg(&ctask->sendbuf,
1612 &sg[ctask->sg_count++]);
1614 ctask->bad_sg = sg + sc->use_sg;
1616 iscsi_buf_init_iov(&ctask->sendbuf, sc->request_buffer,
1617 sc->request_bufflen);
1623 * imm_count bytes to be sent right after
1626 * unsol_count bytes(as Data-Out) to be sent
1627 * without R2T ack right after
1630 * r2t_data_count bytes to be sent via R2T ack's
1632 * pad_count bytes to be sent as zero-padding
1634 ctask->imm_count = 0;
1635 ctask->unsol_count = 0;
1636 ctask->unsol_datasn = 0;
1637 ctask->xmstate = XMSTATE_W_HDR;
1638 /* calculate write padding */
1639 ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1);
1640 if (ctask->pad_count) {
1641 ctask->pad_count = ISCSI_PAD_LEN - ctask->pad_count;
1642 debug_scsi("write padding %d bytes\n",
1644 ctask->xmstate |= XMSTATE_W_PAD;
1646 if (session->imm_data_en) {
1647 if (ctask->total_length >= session->first_burst)
1648 ctask->imm_count = min(session->first_burst,
1649 conn->max_xmit_dlength);
1651 ctask->imm_count = min(ctask->total_length,
1652 conn->max_xmit_dlength);
1653 hton24(ctask->hdr.dlength, ctask->imm_count);
1654 ctask->xmstate |= XMSTATE_IMM_DATA;
1656 zero_data(ctask->hdr.dlength);
1658 if (!session->initial_r2t_en)
1659 ctask->unsol_count = min(session->first_burst,
1660 ctask->total_length) - ctask->imm_count;
1661 if (!ctask->unsol_count)
1662 /* No unsolicit Data-Out's */
1663 ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
1665 ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
1667 ctask->r2t_data_count = ctask->total_length -
1671 debug_scsi("cmd [itt %x total %d imm %d imm_data %d "
1673 ctask->itt, ctask->total_length, ctask->imm_count,
1674 ctask->unsol_count, ctask->r2t_data_count);
1676 ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
1677 if (sc->sc_data_direction == DMA_FROM_DEVICE)
1678 ctask->hdr.flags |= ISCSI_FLAG_CMD_READ;
1680 ctask->xmstate = XMSTATE_R_HDR;
1681 zero_data(ctask->hdr.dlength);
1684 iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr,
1685 sizeof(struct iscsi_hdr));
1686 conn->scsicmd_pdus_cnt++;
1690 * iscsi_mtask_xmit - xmit management(immediate) task
1691 * @conn: iscsi connection
1692 * @mtask: task management task
1695 * The function can return -EAGAIN in which case caller must
1696 * call it again later, or recover. '0' return code means successful
1699 * Management xmit state machine consists of two states:
1700 * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
1701 * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
1704 iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
1707 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1708 conn->id, mtask->xmstate, mtask->itt);
1710 if (mtask->xmstate & XMSTATE_IMM_HDR) {
1711 mtask->xmstate &= ~XMSTATE_IMM_HDR;
1712 if (mtask->data_count)
1713 mtask->xmstate |= XMSTATE_IMM_DATA;
1714 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
1715 conn->stop_stage != STOP_CONN_RECOVER &&
1717 iscsi_hdr_digest(conn, &mtask->headbuf,
1718 (u8*)mtask->hdrext);
1719 if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) {
1720 mtask->xmstate |= XMSTATE_IMM_HDR;
1721 if (mtask->data_count)
1722 mtask->xmstate &= ~XMSTATE_IMM_DATA;
1727 if (mtask->xmstate & XMSTATE_IMM_DATA) {
1728 BUG_ON(!mtask->data_count);
1729 mtask->xmstate &= ~XMSTATE_IMM_DATA;
1730 /* FIXME: implement.
1731 * Virtual buffer could be spreaded across multiple pages...
1734 if (iscsi_sendpage(conn, &mtask->sendbuf,
1735 &mtask->data_count, &mtask->sent)) {
1736 mtask->xmstate |= XMSTATE_IMM_DATA;
1739 } while (mtask->data_count);
1742 BUG_ON(mtask->xmstate != XMSTATE_IDLE);
1747 handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1749 ctask->xmstate &= ~XMSTATE_R_HDR;
1750 if (conn->hdrdgst_en)
1751 iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
1752 if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) {
1753 BUG_ON(ctask->xmstate != XMSTATE_IDLE);
1754 return 0; /* wait for Data-In */
1756 ctask->xmstate |= XMSTATE_R_HDR;
1761 handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1763 ctask->xmstate &= ~XMSTATE_W_HDR;
1764 if (conn->hdrdgst_en)
1765 iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
1766 if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) {
1767 ctask->xmstate |= XMSTATE_W_HDR;
1774 handle_xmstate_data_digest(struct iscsi_conn *conn,
1775 struct iscsi_cmd_task *ctask)
1777 ctask->xmstate &= ~XMSTATE_DATA_DIGEST;
1778 debug_tcp("resent data digest 0x%x\n", ctask->datadigest);
1779 if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
1780 &ctask->datadigest, 0)) {
1781 ctask->xmstate |= XMSTATE_DATA_DIGEST;
1782 debug_tcp("resent data digest 0x%x fail!\n",
1790 handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1792 BUG_ON(!ctask->imm_count);
1793 ctask->xmstate &= ~XMSTATE_IMM_DATA;
1795 if (conn->datadgst_en) {
1796 iscsi_data_digest_init(conn, ctask);
1797 ctask->immdigest = 0;
1801 if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->imm_count,
1803 ctask->xmstate |= XMSTATE_IMM_DATA;
1804 if (conn->datadgst_en) {
1805 crypto_digest_final(conn->data_tx_tfm,
1806 (u8*)&ctask->immdigest);
1807 debug_tcp("tx imm sendpage fail 0x%x\n",
1812 if (conn->datadgst_en)
1813 iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
1815 if (!ctask->imm_count)
1817 iscsi_buf_init_sg(&ctask->sendbuf,
1818 &ctask->sg[ctask->sg_count++]);
1821 if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
1822 if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
1823 &ctask->immdigest, 1)) {
1824 debug_tcp("sending imm digest 0x%x fail!\n",
1828 debug_tcp("sending imm digest 0x%x\n", ctask->immdigest);
1835 handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1837 struct iscsi_data_task *dtask;
1839 ctask->xmstate |= XMSTATE_UNS_DATA;
1840 if (ctask->xmstate & XMSTATE_UNS_INIT) {
1841 iscsi_unsolicit_data_init(conn, ctask);
1842 BUG_ON(!ctask->dtask);
1843 dtask = ctask->dtask;
1844 if (conn->hdrdgst_en)
1845 iscsi_hdr_digest(conn, &ctask->headbuf,
1846 (u8*)dtask->hdrext);
1847 ctask->xmstate &= ~XMSTATE_UNS_INIT;
1849 if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) {
1850 ctask->xmstate &= ~XMSTATE_UNS_DATA;
1851 ctask->xmstate |= XMSTATE_UNS_HDR;
1855 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1856 ctask->itt, ctask->unsol_count, ctask->sent);
1861 handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1863 struct iscsi_data_task *dtask = ctask->dtask;
1865 BUG_ON(!ctask->data_count);
1866 ctask->xmstate &= ~XMSTATE_UNS_DATA;
1868 if (conn->datadgst_en) {
1869 iscsi_data_digest_init(conn, ctask);
1874 int start = ctask->sent;
1876 if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->data_count,
1878 ctask->unsol_count -= ctask->sent - start;
1879 ctask->xmstate |= XMSTATE_UNS_DATA;
1880 /* will continue with this ctask later.. */
1881 if (conn->datadgst_en) {
1882 crypto_digest_final(conn->data_tx_tfm,
1883 (u8 *)&dtask->digest);
1884 debug_tcp("tx uns data fail 0x%x\n",
1890 BUG_ON(ctask->sent > ctask->total_length);
1891 ctask->unsol_count -= ctask->sent - start;
1894 * XXX:we may run here with un-initial sendbuf.
1897 if (conn->datadgst_en && ctask->sent - start > 0)
1898 iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
1900 if (!ctask->data_count)
1902 iscsi_buf_init_sg(&ctask->sendbuf,
1903 &ctask->sg[ctask->sg_count++]);
1905 BUG_ON(ctask->unsol_count < 0);
1908 * Done with the Data-Out. Next, check if we need
1909 * to send another unsolicited Data-Out.
1911 if (ctask->unsol_count) {
1912 if (conn->datadgst_en) {
1913 if (iscsi_digest_final_send(conn, ctask,
1915 &dtask->digest, 1)) {
1916 debug_tcp("send uns digest 0x%x fail\n",
1920 debug_tcp("sending uns digest 0x%x, more uns\n",
1923 ctask->xmstate |= XMSTATE_UNS_INIT;
1927 if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
1928 if (iscsi_digest_final_send(conn, ctask,
1930 &dtask->digest, 1)) {
1931 debug_tcp("send last uns digest 0x%x fail\n",
1935 debug_tcp("sending uns digest 0x%x\n",dtask->digest);
1942 handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1944 struct iscsi_session *session = conn->session;
1945 struct iscsi_r2t_info *r2t = ctask->r2t;
1946 struct iscsi_data_task *dtask = r2t->dtask;
1949 ctask->xmstate &= ~XMSTATE_SOL_DATA;
1950 ctask->dtask = dtask;
1952 if (conn->datadgst_en) {
1953 iscsi_data_digest_init(conn, ctask);
1958 * send Data-Out whitnin this R2T sequence.
1960 if (!r2t->data_count)
1963 if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) {
1964 ctask->xmstate |= XMSTATE_SOL_DATA;
1965 /* will continue with this ctask later.. */
1966 if (conn->datadgst_en) {
1967 crypto_digest_final(conn->data_tx_tfm,
1968 (u8 *)&dtask->digest);
1969 debug_tcp("r2t data send fail 0x%x\n", dtask->digest);
1974 BUG_ON(r2t->data_count < 0);
1975 if (conn->datadgst_en)
1976 iscsi_buf_data_digest_update(conn, &r2t->sendbuf);
1978 if (r2t->data_count) {
1979 BUG_ON(ctask->sc->use_sg == 0);
1980 if (!iscsi_buf_left(&r2t->sendbuf)) {
1981 BUG_ON(ctask->bad_sg == r2t->sg);
1982 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1990 * Done with this Data-Out. Next, check if we have
1991 * to send another Data-Out for this R2T.
1993 BUG_ON(r2t->data_length - r2t->sent < 0);
1994 left = r2t->data_length - r2t->sent;
1996 if (conn->datadgst_en) {
1997 if (iscsi_digest_final_send(conn, ctask,
1999 &dtask->digest, 1)) {
2000 debug_tcp("send r2t data digest 0x%x"
2001 "fail\n", dtask->digest);
2004 debug_tcp("r2t data send digest 0x%x\n",
2007 iscsi_solicit_data_cont(conn, ctask, r2t, left);
2008 ctask->xmstate |= XMSTATE_SOL_DATA;
2009 ctask->xmstate &= ~XMSTATE_SOL_HDR;
2014 * Done with this R2T. Check if there are more
2015 * outstanding R2Ts ready to be processed.
2017 BUG_ON(ctask->r2t_data_count - r2t->data_length < 0);
2018 if (conn->datadgst_en) {
2019 if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf,
2020 &dtask->digest, 1)) {
2021 debug_tcp("send last r2t data digest 0x%x"
2022 "fail\n", dtask->digest);
2025 debug_tcp("r2t done dout digest 0x%x\n", dtask->digest);
2028 ctask->r2t_data_count -= r2t->data_length;
2030 spin_lock_bh(&session->lock);
2031 __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
2032 spin_unlock_bh(&session->lock);
2033 if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
2035 ctask->xmstate |= XMSTATE_SOL_DATA;
2036 ctask->xmstate &= ~XMSTATE_SOL_HDR;
2044 handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
2046 struct iscsi_data_task *dtask = ctask->dtask;
2049 ctask->xmstate &= ~XMSTATE_W_PAD;
2050 iscsi_buf_init_virt(&ctask->sendbuf, (char*)&ctask->pad,
2052 if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->pad_count, &sent)) {
2053 ctask->xmstate |= XMSTATE_W_PAD;
2057 if (conn->datadgst_en) {
2058 iscsi_buf_data_digest_update(conn, &ctask->sendbuf);
2061 if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
2062 &ctask->immdigest, 1)) {
2063 debug_tcp("send padding digest 0x%x"
2064 "fail!\n", ctask->immdigest);
2067 debug_tcp("done with padding, digest 0x%x\n",
2070 if (iscsi_digest_final_send(conn, ctask,
2072 &dtask->digest, 1)) {
2073 debug_tcp("send padding digest 0x%x"
2074 "fail\n", dtask->digest);
2077 debug_tcp("done with padding, digest 0x%x\n",
2086 iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
2090 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
2091 conn->id, ctask->xmstate, ctask->itt);
2094 * serialize with TMF AbortTask
2099 if (ctask->xmstate & XMSTATE_R_HDR) {
2100 rc = handle_xmstate_r_hdr(conn, ctask);
2104 if (ctask->xmstate & XMSTATE_W_HDR) {
2105 rc = handle_xmstate_w_hdr(conn, ctask);
2110 /* XXX: for data digest xmit recover */
2111 if (ctask->xmstate & XMSTATE_DATA_DIGEST) {
2112 rc = handle_xmstate_data_digest(conn, ctask);
2117 if (ctask->xmstate & XMSTATE_IMM_DATA) {
2118 rc = handle_xmstate_imm_data(conn, ctask);
2123 if (ctask->xmstate & XMSTATE_UNS_HDR) {
2124 BUG_ON(!ctask->unsol_count);
2125 ctask->xmstate &= ~XMSTATE_UNS_HDR;
2126 unsolicit_head_again:
2127 rc = handle_xmstate_uns_hdr(conn, ctask);
2132 if (ctask->xmstate & XMSTATE_UNS_DATA) {
2133 rc = handle_xmstate_uns_data(conn, ctask);
2135 goto unsolicit_head_again;
2141 if (ctask->xmstate & XMSTATE_SOL_HDR) {
2142 struct iscsi_r2t_info *r2t;
2144 ctask->xmstate &= ~XMSTATE_SOL_HDR;
2145 ctask->xmstate |= XMSTATE_SOL_DATA;
2147 __kfifo_get(ctask->r2tqueue, (void*)&ctask->r2t,
2151 if (conn->hdrdgst_en)
2152 iscsi_hdr_digest(conn, &r2t->headbuf,
2153 (u8*)r2t->dtask->hdrext);
2154 if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) {
2155 ctask->xmstate &= ~XMSTATE_SOL_DATA;
2156 ctask->xmstate |= XMSTATE_SOL_HDR;
2160 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
2161 r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
2165 if (ctask->xmstate & XMSTATE_SOL_DATA) {
2166 rc = handle_xmstate_sol_data(conn, ctask);
2168 goto solicit_head_again;
2175 * Last thing to check is whether we need to send write
2176 * padding. Note that we check for xmstate equality, not just the bit.
2178 if (ctask->xmstate == XMSTATE_W_PAD)
2179 rc = handle_xmstate_w_pad(conn, ctask);
2185 * iscsi_data_xmit - xmit any command into the scheduled connection
2186 * @conn: iscsi connection
2189 * The function can return -EAGAIN in which case the caller must
2190 * re-schedule it again later or recover. '0' return code means
2194 iscsi_data_xmit(struct iscsi_conn *conn)
2196 if (unlikely(conn->suspend_tx)) {
2197 debug_tcp("conn %d Tx suspended!\n", conn->id);
2202 * Transmit in the following order:
2204 * 1) un-finished xmit (ctask or mtask)
2205 * 2) immediate control PDUs
2208 * 5) non-immediate control PDUs
2210 * No need to lock around __kfifo_get as long as
2211 * there's one producer and one consumer.
2214 BUG_ON(conn->ctask && conn->mtask);
2217 if (iscsi_ctask_xmit(conn, conn->ctask))
2219 /* done with this in-progress ctask */
2223 if (iscsi_mtask_xmit(conn, conn->mtask))
2225 /* done with this in-progress mtask */
2229 /* process immediate first */
2230 if (unlikely(__kfifo_len(conn->immqueue))) {
2231 struct iscsi_session *session = conn->session;
2232 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
2234 if (iscsi_mtask_xmit(conn, conn->mtask))
2237 if (conn->mtask->hdr.itt ==
2238 cpu_to_be32(ISCSI_RESERVED_TAG)) {
2239 spin_lock_bh(&session->lock);
2240 __kfifo_put(session->mgmtpool.queue,
2241 (void*)&conn->mtask, sizeof(void*));
2242 spin_unlock_bh(&session->lock);
2245 /* done with this mtask */
2249 /* process write queue */
2250 while (__kfifo_get(conn->writequeue, (void*)&conn->ctask,
2252 if (iscsi_ctask_xmit(conn, conn->ctask))
2256 /* process command queue */
2257 while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask,
2259 if (iscsi_ctask_xmit(conn, conn->ctask))
2262 /* done with this ctask */
2265 /* process the rest control plane PDUs, if any */
2266 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
2267 struct iscsi_session *session = conn->session;
2269 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
2271 if (iscsi_mtask_xmit(conn, conn->mtask))
2274 if (conn->mtask->hdr.itt ==
2275 cpu_to_be32(ISCSI_RESERVED_TAG)) {
2276 spin_lock_bh(&session->lock);
2277 __kfifo_put(session->mgmtpool.queue,
2278 (void*)&conn->mtask,
2280 spin_unlock_bh(&session->lock);
2283 /* done with this mtask */
2290 if (unlikely(conn->suspend_tx))
2297 iscsi_xmitworker(void *data)
2299 struct iscsi_conn *conn = data;
2302 * serialize Xmit worker on a per-connection basis.
2304 mutex_lock(&conn->xmitmutex);
2305 if (iscsi_data_xmit(conn))
2306 schedule_work(&conn->xmitwork);
2307 mutex_unlock(&conn->xmitmutex);
2310 #define FAILURE_BAD_HOST 1
2311 #define FAILURE_SESSION_FAILED 2
2312 #define FAILURE_SESSION_FREED 3
2313 #define FAILURE_WINDOW_CLOSED 4
2314 #define FAILURE_SESSION_TERMINATE 5
2317 iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
2319 struct Scsi_Host *host;
2321 struct iscsi_session *session;
2322 struct iscsi_conn *conn = NULL;
2323 struct iscsi_cmd_task *ctask = NULL;
2325 sc->scsi_done = done;
2328 host = sc->device->host;
2329 session = iscsi_hostdata(host->hostdata);
2330 BUG_ON(host != session->host);
2332 spin_lock(&session->lock);
2334 if (session->state != ISCSI_STATE_LOGGED_IN) {
2335 if (session->state == ISCSI_STATE_FAILED) {
2336 reason = FAILURE_SESSION_FAILED;
2338 } else if (session->state == ISCSI_STATE_TERMINATE) {
2339 reason = FAILURE_SESSION_TERMINATE;
2342 reason = FAILURE_SESSION_FREED;
2347 * Check for iSCSI window and take care of CmdSN wrap-around
2349 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
2350 reason = FAILURE_WINDOW_CLOSED;
2354 conn = session->leadconn;
2356 __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
2359 sc->SCp.phase = session->age;
2360 sc->SCp.ptr = (char*)ctask;
2361 iscsi_cmd_init(conn, ctask, sc);
2363 __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
2365 "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
2366 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
2367 conn->id, (long)sc, ctask->itt, sc->request_bufflen,
2368 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
2369 spin_unlock(&session->lock);
2371 if (!in_interrupt() && mutex_trylock(&conn->xmitmutex)) {
2372 spin_unlock_irq(host->host_lock);
2373 if (iscsi_data_xmit(conn))
2374 schedule_work(&conn->xmitwork);
2375 mutex_unlock(&conn->xmitmutex);
2376 spin_lock_irq(host->host_lock);
2378 schedule_work(&conn->xmitwork);
2383 spin_unlock(&session->lock);
2384 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
2385 return SCSI_MLQUEUE_HOST_BUSY;
2388 spin_unlock(&session->lock);
2389 printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n",
2390 sc->cmnd[0], reason);
2391 sc->sense_buffer[0] = 0x70;
2392 sc->sense_buffer[2] = NOT_READY;
2393 sc->sense_buffer[7] = 0x6;
2394 sc->sense_buffer[12] = 0x08;
2395 sc->sense_buffer[13] = 0x00;
2396 sc->result = (DID_NO_CONNECT << 16);
2397 sc->resid = sc->request_bufflen;
2403 iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
2405 if (depth > ISCSI_MAX_CMD_PER_LUN)
2406 depth = ISCSI_MAX_CMD_PER_LUN;
2407 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
2408 return sdev->queue_depth;
2412 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
2416 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
2421 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
2422 if (q->pool == NULL) {
2427 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
2429 if (q->queue == ERR_PTR(-ENOMEM)) {
2435 for (i = 0; i < max; i++) {
2436 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
2437 if (q->pool[i] == NULL) {
2440 for (j = 0; j < i; j++)
2443 kfifo_free(q->queue);
2448 memset(q->pool[i], 0, item_size);
2449 (*items)[i] = q->pool[i];
2450 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
2456 iscsi_pool_free(struct iscsi_queue *q, void **items)
2460 for (i = 0; i < q->max; i++)
2466 static iscsi_connh_t
2467 iscsi_conn_create(iscsi_sessionh_t sessionh, uint32_t conn_idx)
2469 struct iscsi_session *session = iscsi_ptr(sessionh);
2470 struct iscsi_conn *conn = NULL;
2472 conn = kmalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
2474 goto conn_alloc_fail;
2475 memset(conn, 0, sizeof(struct iscsi_conn));
2477 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2478 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
2479 conn->id = conn_idx;
2480 conn->exp_statsn = 0;
2481 conn->tmabort_state = TMABORT_INITIAL;
2483 /* initial operational parameters */
2484 conn->hdr_size = sizeof(struct iscsi_hdr);
2485 conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
2486 conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
2488 spin_lock_init(&conn->lock);
2490 /* initialize general xmit PDU commands queue */
2491 conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*),
2493 if (conn->xmitqueue == ERR_PTR(-ENOMEM))
2494 goto xmitqueue_alloc_fail;
2496 /* initialize write response PDU commands queue */
2497 conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*),
2499 if (conn->writequeue == ERR_PTR(-ENOMEM))
2500 goto writequeue_alloc_fail;
2502 /* initialize general immediate & non-immediate PDU commands queue */
2503 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
2505 if (conn->immqueue == ERR_PTR(-ENOMEM))
2506 goto immqueue_alloc_fail;
2508 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
2510 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
2511 goto mgmtqueue_alloc_fail;
2513 INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
2515 /* allocate login_mtask used for the login/text sequences */
2516 spin_lock_bh(&session->lock);
2517 if (!__kfifo_get(session->mgmtpool.queue,
2518 (void*)&conn->login_mtask,
2520 spin_unlock_bh(&session->lock);
2521 goto login_mtask_alloc_fail;
2523 spin_unlock_bh(&session->lock);
2525 /* allocate initial PDU receive place holder */
2526 if (conn->data_size <= PAGE_SIZE)
2527 conn->data = kmalloc(conn->data_size, GFP_KERNEL);
2529 conn->data = (void*)__get_free_pages(GFP_KERNEL,
2530 get_order(conn->data_size));
2532 goto max_recv_dlenght_alloc_fail;
2534 init_timer(&conn->tmabort_timer);
2535 mutex_init(&conn->xmitmutex);
2536 init_waitqueue_head(&conn->ehwait);
2538 return iscsi_handle(conn);
2540 max_recv_dlenght_alloc_fail:
2541 spin_lock_bh(&session->lock);
2542 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
2544 spin_unlock_bh(&session->lock);
2545 login_mtask_alloc_fail:
2546 kfifo_free(conn->mgmtqueue);
2547 mgmtqueue_alloc_fail:
2548 kfifo_free(conn->immqueue);
2549 immqueue_alloc_fail:
2550 kfifo_free(conn->writequeue);
2551 writequeue_alloc_fail:
2552 kfifo_free(conn->xmitqueue);
2553 xmitqueue_alloc_fail:
2556 return iscsi_handle(NULL);
2560 iscsi_conn_destroy(iscsi_connh_t connh)
2562 struct iscsi_conn *conn = iscsi_ptr(connh);
2563 struct iscsi_session *session = conn->session;
2565 mutex_lock(&conn->xmitmutex);
2566 set_bit(SUSPEND_BIT, &conn->suspend_tx);
2567 if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE && conn->sock) {
2568 struct sock *sk = conn->sock->sk;
2571 * conn_start() has never been called!
2572 * need to cleanup the socket.
2574 write_lock_bh(&sk->sk_callback_lock);
2575 set_bit(SUSPEND_BIT, &conn->suspend_rx);
2576 write_unlock_bh(&sk->sk_callback_lock);
2578 sock_hold(conn->sock->sk);
2579 iscsi_conn_restore_callbacks(conn);
2580 sock_put(conn->sock->sk);
2581 sock_release(conn->sock);
2585 spin_lock_bh(&session->lock);
2586 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2587 if (session->leadconn == conn) {
2589 * leading connection? then give up on recovery.
2591 session->state = ISCSI_STATE_TERMINATE;
2592 wake_up(&conn->ehwait);
2594 spin_unlock_bh(&session->lock);
2596 mutex_unlock(&conn->xmitmutex);
2599 * Block until all in-progress commands for this connection
2603 spin_lock_bh(&conn->lock);
2604 if (!session->host->host_busy) { /* OK for ERL == 0 */
2605 spin_unlock_bh(&conn->lock);
2608 spin_unlock_bh(&conn->lock);
2609 msleep_interruptible(500);
2610 printk("conn_destroy(): host_busy %d host_failed %d\n",
2611 session->host->host_busy, session->host->host_failed);
2613 * force eh_abort() to unblock
2615 wake_up(&conn->ehwait);
2618 /* now free crypto */
2619 if (conn->hdrdgst_en || conn->datadgst_en) {
2621 crypto_free_tfm(conn->tx_tfm);
2623 crypto_free_tfm(conn->rx_tfm);
2624 if (conn->data_tx_tfm)
2625 crypto_free_tfm(conn->data_tx_tfm);
2626 if (conn->data_rx_tfm)
2627 crypto_free_tfm(conn->data_rx_tfm);
2630 /* free conn->data, size = MaxRecvDataSegmentLength */
2631 if (conn->data_size <= PAGE_SIZE)
2634 free_pages((unsigned long)conn->data,
2635 get_order(conn->data_size));
2637 spin_lock_bh(&session->lock);
2638 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
2640 list_del(&conn->item);
2641 if (list_empty(&session->connections))
2642 session->leadconn = NULL;
2643 if (session->leadconn && session->leadconn == conn)
2644 session->leadconn = container_of(session->connections.next,
2645 struct iscsi_conn, item);
2647 if (session->leadconn == NULL)
2648 /* none connections exits.. reset sequencing */
2649 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
2650 spin_unlock_bh(&session->lock);
2652 kfifo_free(conn->xmitqueue);
2653 kfifo_free(conn->writequeue);
2654 kfifo_free(conn->immqueue);
2655 kfifo_free(conn->mgmtqueue);
2660 iscsi_conn_bind(iscsi_sessionh_t sessionh, iscsi_connh_t connh,
2661 uint32_t transport_fd, int is_leading)
2663 struct iscsi_session *session = iscsi_ptr(sessionh);
2664 struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = iscsi_ptr(connh);
2666 struct socket *sock;
2669 /* lookup for existing socket */
2670 sock = sockfd_lookup(transport_fd, &err);
2672 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
2676 /* lookup for existing connection */
2677 spin_lock_bh(&session->lock);
2678 list_for_each_entry(tmp, &session->connections, item) {
2680 if (conn->c_stage != ISCSI_CONN_STOPPED ||
2681 conn->stop_stage == STOP_CONN_TERM) {
2682 printk(KERN_ERR "iscsi_tcp: can't bind "
2683 "non-stopped connection (%d:%d)\n",
2684 conn->c_stage, conn->stop_stage);
2685 spin_unlock_bh(&session->lock);
2692 /* bind new iSCSI connection to session */
2693 conn->session = session;
2695 list_add(&conn->item, &session->connections);
2697 spin_unlock_bh(&session->lock);
2699 if (conn->stop_stage != STOP_CONN_SUSPEND) {
2700 /* bind iSCSI connection and socket */
2703 /* setup Socket parameters */
2706 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
2707 sk->sk_allocation = GFP_ATOMIC;
2709 /* FIXME: disable Nagle's algorithm */
2712 * Intercept TCP callbacks for sendfile like receive
2715 iscsi_conn_set_callbacks(conn);
2718 * set receive state machine into initial state
2720 conn->in_progress = IN_PROGRESS_WAIT_HEADER;
2724 session->leadconn = conn;
2727 * Unblock xmitworker(), Login Phase will pass through.
2729 clear_bit(SUSPEND_BIT, &conn->suspend_rx);
2730 clear_bit(SUSPEND_BIT, &conn->suspend_tx);
2736 iscsi_conn_start(iscsi_connh_t connh)
2738 struct iscsi_conn *conn = iscsi_ptr(connh);
2739 struct iscsi_session *session = conn->session;
2742 /* FF phase warming up... */
2744 if (session == NULL) {
2745 printk(KERN_ERR "iscsi_tcp: can't start unbound connection\n");
2749 sk = conn->sock->sk;
2751 write_lock_bh(&sk->sk_callback_lock);
2752 spin_lock_bh(&session->lock);
2753 conn->c_stage = ISCSI_CONN_STARTED;
2754 session->state = ISCSI_STATE_LOGGED_IN;
2756 switch(conn->stop_stage) {
2757 case STOP_CONN_RECOVER:
2759 * unblock eh_abort() if it is blocked. re-try all
2760 * commands after successful recovery
2762 session->conn_cnt++;
2763 conn->stop_stage = 0;
2764 conn->tmabort_state = TMABORT_INITIAL;
2766 wake_up(&conn->ehwait);
2768 case STOP_CONN_TERM:
2769 session->conn_cnt++;
2770 conn->stop_stage = 0;
2772 case STOP_CONN_SUSPEND:
2773 conn->stop_stage = 0;
2774 clear_bit(SUSPEND_BIT, &conn->suspend_rx);
2775 clear_bit(SUSPEND_BIT, &conn->suspend_tx);
2780 spin_unlock_bh(&session->lock);
2781 write_unlock_bh(&sk->sk_callback_lock);
2787 iscsi_conn_stop(iscsi_connh_t connh, int flag)
2789 struct iscsi_conn *conn = iscsi_ptr(connh);
2790 struct iscsi_session *session = conn->session;
2792 unsigned long flags;
2794 BUG_ON(!conn->sock);
2795 sk = conn->sock->sk;
2796 write_lock_bh(&sk->sk_callback_lock);
2797 set_bit(SUSPEND_BIT, &conn->suspend_rx);
2798 write_unlock_bh(&sk->sk_callback_lock);
2800 mutex_lock(&conn->xmitmutex);
2802 spin_lock_irqsave(session->host->host_lock, flags);
2803 spin_lock(&session->lock);
2804 conn->stop_stage = flag;
2805 conn->c_stage = ISCSI_CONN_STOPPED;
2806 set_bit(SUSPEND_BIT, &conn->suspend_tx);
2808 if (flag != STOP_CONN_SUSPEND)
2809 session->conn_cnt--;
2811 if (session->conn_cnt == 0 || session->leadconn == conn)
2812 session->state = ISCSI_STATE_FAILED;
2814 spin_unlock(&session->lock);
2815 spin_unlock_irqrestore(session->host->host_lock, flags);
2817 if (flag == STOP_CONN_TERM || flag == STOP_CONN_RECOVER) {
2818 struct iscsi_cmd_task *ctask;
2819 struct iscsi_mgmt_task *mtask;
2822 * Socket must go now.
2824 sock_hold(conn->sock->sk);
2825 iscsi_conn_restore_callbacks(conn);
2826 sock_put(conn->sock->sk);
2829 * flush xmit queues.
2831 spin_lock_bh(&session->lock);
2832 while (__kfifo_get(conn->writequeue, (void*)&ctask,
2834 __kfifo_get(conn->xmitqueue, (void*)&ctask,
2836 struct iscsi_r2t_info *r2t;
2839 * flush ctask's r2t queues
2841 while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
2843 __kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
2846 spin_unlock_bh(&session->lock);
2848 iscsi_ctask_cleanup(conn, ctask);
2850 spin_lock_bh(&session->lock);
2853 while (__kfifo_get(conn->immqueue, (void*)&mtask,
2855 __kfifo_get(conn->mgmtqueue, (void*)&mtask,
2857 __kfifo_put(session->mgmtpool.queue,
2858 (void*)&mtask, sizeof(void*));
2861 spin_unlock_bh(&session->lock);
2864 * release socket only after we stopped data_xmit()
2865 * activity and flushed all outstandings
2867 sock_release(conn->sock);
2871 * for connection level recovery we should not calculate
2872 * header digest. conn->hdr_size used for optimization
2873 * in hdr_extract() and will be re-negotiated at
2876 if (flag == STOP_CONN_RECOVER) {
2877 conn->hdr_size = sizeof(struct iscsi_hdr);
2878 conn->hdrdgst_en = 0;
2879 conn->datadgst_en = 0;
2882 mutex_unlock(&conn->xmitmutex);
2886 iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
2887 char *data, uint32_t data_size)
2889 struct iscsi_session *session = conn->session;
2890 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
2891 struct iscsi_mgmt_task *mtask;
2893 spin_lock_bh(&session->lock);
2894 if (session->state == ISCSI_STATE_TERMINATE) {
2895 spin_unlock_bh(&session->lock);
2898 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
2899 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
2901 * Login and Text are sent serially, in
2902 * request-followed-by-response sequence.
2903 * Same mtask can be used. Same ITT must be used.
2904 * Note that login_mtask is preallocated at conn_create().
2906 mtask = conn->login_mtask;
2908 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
2909 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
2911 if (!__kfifo_get(session->mgmtpool.queue,
2912 (void*)&mtask, sizeof(void*))) {
2913 spin_unlock_bh(&session->lock);
2919 * pre-format CmdSN and ExpStatSN for outgoing PDU.
2921 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
2922 hdr->itt = mtask->itt | (conn->id << CID_SHIFT) |
2923 (session->age << AGE_SHIFT);
2924 nop->cmdsn = cpu_to_be32(session->cmdsn);
2925 if (conn->c_stage == ISCSI_CONN_STARTED &&
2926 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2929 /* do not advance CmdSN */
2930 nop->cmdsn = cpu_to_be32(session->cmdsn);
2932 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
2934 memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr));
2936 iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
2937 sizeof(struct iscsi_hdr));
2939 spin_unlock_bh(&session->lock);
2942 memcpy(mtask->data, data, data_size);
2943 mtask->data_count = data_size;
2945 mtask->data_count = 0;
2947 mtask->xmstate = XMSTATE_IMM_HDR;
2949 if (mtask->data_count) {
2950 iscsi_buf_init_iov(&mtask->sendbuf, (char*)mtask->data,
2954 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
2955 hdr->opcode, hdr->itt, data_size);
2958 * since send_pdu() could be called at least from two contexts,
2959 * we need to serialize __kfifo_put, so we don't have to take
2960 * additional lock on fast data-path
2962 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
2963 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
2965 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
2967 schedule_work(&conn->xmitwork);
2973 iscsi_eh_host_reset(struct scsi_cmnd *sc)
2975 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
2976 struct iscsi_conn *conn = ctask->conn;
2977 struct iscsi_session *session = conn->session;
2979 spin_lock_bh(&session->lock);
2980 if (session->state == ISCSI_STATE_TERMINATE) {
2981 debug_scsi("failing host reset: session terminated "
2982 "[CID %d age %d]", conn->id, session->age);
2983 spin_unlock_bh(&session->lock);
2986 spin_unlock_bh(&session->lock);
2988 debug_scsi("failing connection CID %d due to SCSI host reset "
2989 "[itt 0x%x age %d]", conn->id, ctask->itt,
2991 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2997 iscsi_tmabort_timedout(unsigned long data)
2999 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
3000 struct iscsi_conn *conn = ctask->conn;
3001 struct iscsi_session *session = conn->session;
3003 spin_lock(&session->lock);
3004 if (conn->tmabort_state == TMABORT_INITIAL) {
3005 __kfifo_put(session->mgmtpool.queue,
3006 (void*)&ctask->mtask, sizeof(void*));
3007 conn->tmabort_state = TMABORT_TIMEDOUT;
3008 debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n",
3009 (long)ctask->sc, ctask->itt);
3010 /* unblock eh_abort() */
3011 wake_up(&conn->ehwait);
3013 spin_unlock(&session->lock);
3017 iscsi_eh_abort(struct scsi_cmnd *sc)
3020 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
3021 struct iscsi_conn *conn = ctask->conn;
3022 struct iscsi_session *session = conn->session;
3024 conn->eh_abort_cnt++;
3025 debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
3028 * two cases for ERL=0 here:
3030 * 1) connection-level failure;
3031 * 2) recovery due protocol error;
3033 mutex_lock(&conn->xmitmutex);
3034 spin_lock_bh(&session->lock);
3035 if (session->state != ISCSI_STATE_LOGGED_IN) {
3036 if (session->state == ISCSI_STATE_TERMINATE) {
3037 spin_unlock_bh(&session->lock);
3038 mutex_unlock(&conn->xmitmutex);
3041 spin_unlock_bh(&session->lock);
3043 struct iscsi_tm *hdr = &conn->tmhdr;
3046 * Still LOGGED_IN...
3049 if (!ctask->sc || sc->SCp.phase != session->age) {
3051 * 1) ctask completed before time out. But session
3052 * is still ok => Happy Retry.
3053 * 2) session was re-open during time out of ctask.
3055 spin_unlock_bh(&session->lock);
3056 mutex_unlock(&conn->xmitmutex);
3059 conn->tmabort_state = TMABORT_INITIAL;
3060 spin_unlock_bh(&session->lock);
3063 * ctask timed out but session is OK
3064 * ERL=0 requires task mgmt abort to be issued on each
3065 * failed command. requests must be serialized.
3067 memset(hdr, 0, sizeof(struct iscsi_tm));
3068 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
3069 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
3070 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3071 memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
3072 hdr->rtt = ctask->hdr.itt;
3073 hdr->refcmdsn = ctask->hdr.cmdsn;
3075 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
3078 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
3079 debug_scsi("abort sent failure [itt 0x%x]", ctask->itt);
3081 struct iscsi_r2t_info *r2t;
3084 * TMF abort vs. TMF response race logic
3086 spin_lock_bh(&session->lock);
3087 ctask->mtask = (struct iscsi_mgmt_task *)
3088 session->mgmt_cmds[(hdr->itt & ITT_MASK) -
3089 ISCSI_MGMT_ITT_OFFSET];
3091 * have to flush r2tqueue to avoid r2t leaks
3093 while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
3095 __kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
3098 if (conn->tmabort_state == TMABORT_INITIAL) {
3099 conn->tmfcmd_pdus_cnt++;
3100 conn->tmabort_timer.expires = 3*HZ + jiffies;
3101 conn->tmabort_timer.function =
3102 iscsi_tmabort_timedout;
3103 conn->tmabort_timer.data = (unsigned long)ctask;
3104 add_timer(&conn->tmabort_timer);
3105 debug_scsi("abort sent [itt 0x%x]", ctask->itt);
3108 conn->tmabort_state == TMABORT_SUCCESS) {
3109 conn->tmabort_state = TMABORT_INITIAL;
3110 spin_unlock_bh(&session->lock);
3111 mutex_unlock(&conn->xmitmutex);
3114 conn->tmabort_state = TMABORT_INITIAL;
3115 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
3117 spin_unlock_bh(&session->lock);
3120 mutex_unlock(&conn->xmitmutex);
3124 * block eh thread until:
3126 * 1) abort response;
3128 * 3) session re-opened;
3129 * 4) session terminated;
3132 int p_state = session->state;
3134 rc = wait_event_interruptible(conn->ehwait,
3135 (p_state == ISCSI_STATE_LOGGED_IN ?
3136 (session->state == ISCSI_STATE_TERMINATE ||
3137 conn->tmabort_state != TMABORT_INITIAL) :
3138 (session->state == ISCSI_STATE_TERMINATE ||
3139 session->state == ISCSI_STATE_LOGGED_IN)));
3142 session->state = ISCSI_STATE_TERMINATE;
3146 if (signal_pending(current))
3147 flush_signals(current);
3149 if (session->state == ISCSI_STATE_TERMINATE)
3152 spin_lock_bh(&session->lock);
3153 if (sc->SCp.phase == session->age &&
3154 (conn->tmabort_state == TMABORT_TIMEDOUT ||
3155 conn->tmabort_state == TMABORT_FAILED)) {
3156 conn->tmabort_state = TMABORT_INITIAL;
3159 * ctask completed before tmf abort response or
3161 * But session is still ok => Happy Retry.
3163 spin_unlock_bh(&session->lock);
3166 spin_unlock_bh(&session->lock);
3167 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
3170 spin_unlock_bh(&session->lock);
3175 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
3180 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
3184 del_timer_sync(&conn->tmabort_timer);
3186 mutex_lock(&conn->xmitmutex);
3188 struct sock *sk = conn->sock->sk;
3190 write_lock_bh(&sk->sk_callback_lock);
3191 iscsi_ctask_cleanup(conn, ctask);
3192 write_unlock_bh(&sk->sk_callback_lock);
3194 mutex_unlock(&conn->xmitmutex);
3199 iscsi_r2tpool_alloc(struct iscsi_session *session)
3205 * initialize per-task: R2T pool and xmit queue
3207 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
3208 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
3211 * pre-allocated x4 as much r2ts to handle race when
3212 * target acks DataOut faster than we data_xmit() queues
3213 * could replenish r2tqueue.
3217 if (iscsi_pool_init(&ctask->r2tpool, session->max_r2t * 4,
3218 (void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) {
3219 goto r2t_alloc_fail;
3222 /* R2T xmit queue */
3223 ctask->r2tqueue = kfifo_alloc(
3224 session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
3225 if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
3226 iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
3227 goto r2t_alloc_fail;
3232 * Data-Out PDU's within R2T-sequence can be quite big;
3235 ctask->datapool = mempool_create(ISCSI_DTASK_DEFAULT_MAX,
3236 mempool_alloc_slab, mempool_free_slab, taskcache);
3237 if (ctask->datapool == NULL) {
3238 kfifo_free(ctask->r2tqueue);
3239 iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
3240 goto r2t_alloc_fail;
3242 INIT_LIST_HEAD(&ctask->dataqueue);
3248 for (i = 0; i < cmd_i; i++) {
3249 mempool_destroy(session->cmds[i]->datapool);
3250 kfifo_free(session->cmds[i]->r2tqueue);
3251 iscsi_pool_free(&session->cmds[i]->r2tpool,
3252 (void**)session->cmds[i]->r2ts);
3258 iscsi_r2tpool_free(struct iscsi_session *session)
3262 for (i = 0; i < session->cmds_max; i++) {
3263 mempool_destroy(session->cmds[i]->datapool);
3264 kfifo_free(session->cmds[i]->r2tqueue);
3265 iscsi_pool_free(&session->cmds[i]->r2tpool,
3266 (void**)session->cmds[i]->r2ts);
3270 static struct scsi_host_template iscsi_sht = {
3271 .name = "iSCSI Initiator over TCP/IP, v."
3273 .queuecommand = iscsi_queuecommand,
3274 .change_queue_depth = iscsi_change_queue_depth,
3275 .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
3276 .sg_tablesize = ISCSI_SG_TABLESIZE,
3277 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
3278 .eh_abort_handler = iscsi_eh_abort,
3279 .eh_host_reset_handler = iscsi_eh_host_reset,
3280 .use_clustering = DISABLE_CLUSTERING,
3281 .proc_name = "iscsi_tcp",
3285 static iscsi_sessionh_t
3286 iscsi_session_create(uint32_t initial_cmdsn, struct Scsi_Host *host)
3289 struct iscsi_session *session;
3291 session = iscsi_hostdata(host->hostdata);
3292 memset(session, 0, sizeof(struct iscsi_session));
3294 session->host = host;
3295 session->id = host->host_no;
3296 session->state = ISCSI_STATE_LOGGED_IN;
3297 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
3298 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
3299 session->cmdsn = initial_cmdsn;
3300 session->exp_cmdsn = initial_cmdsn + 1;
3301 session->max_cmdsn = initial_cmdsn + 1;
3302 session->max_r2t = 1;
3304 /* initialize SCSI PDU commands pool */
3305 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
3306 (void***)&session->cmds, sizeof(struct iscsi_cmd_task)))
3307 goto cmdpool_alloc_fail;
3309 /* pre-format cmds pool with ITT */
3310 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++)
3311 session->cmds[cmd_i]->itt = cmd_i;
3313 spin_lock_init(&session->lock);
3314 INIT_LIST_HEAD(&session->connections);
3316 /* initialize immediate command pool */
3317 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
3318 (void***)&session->mgmt_cmds, sizeof(struct iscsi_mgmt_task)))
3319 goto mgmtpool_alloc_fail;
3322 /* pre-format immediate cmds pool with ITT */
3323 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
3324 session->mgmt_cmds[cmd_i]->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
3325 session->mgmt_cmds[cmd_i]->data = kmalloc(
3326 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
3327 if (!session->mgmt_cmds[cmd_i]->data) {
3330 for (j = 0; j < cmd_i; j++)
3331 kfree(session->mgmt_cmds[j]->data);
3332 goto immdata_alloc_fail;
3336 if (iscsi_r2tpool_alloc(session))
3337 goto r2tpool_alloc_fail;
3339 return iscsi_handle(session);
3342 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
3343 kfree(session->mgmt_cmds[cmd_i]->data);
3344 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
3346 mgmtpool_alloc_fail:
3347 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
3349 return iscsi_handle(NULL);
3353 iscsi_session_destroy(iscsi_sessionh_t sessionh)
3356 struct iscsi_data_task *dtask, *n;
3357 struct iscsi_session *session = iscsi_ptr(sessionh);
3359 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
3360 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
3361 list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
3362 list_del(&dtask->item);
3363 mempool_free(dtask, ctask->datapool);
3367 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
3368 kfree(session->mgmt_cmds[cmd_i]->data);
3370 iscsi_r2tpool_free(session);
3371 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
3372 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
3376 iscsi_conn_set_param(iscsi_connh_t connh, enum iscsi_param param,
3379 struct iscsi_conn *conn = iscsi_ptr(connh);
3380 struct iscsi_session *session = conn->session;
3382 spin_lock_bh(&session->lock);
3383 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
3384 conn->stop_stage != STOP_CONN_RECOVER) {
3385 printk(KERN_ERR "iscsi_tcp: can not change parameter [%d]\n",
3387 spin_unlock_bh(&session->lock);
3390 spin_unlock_bh(&session->lock);
3393 case ISCSI_PARAM_MAX_RECV_DLENGTH: {
3394 char *saveptr = conn->data;
3395 gfp_t flags = GFP_KERNEL;
3397 if (conn->data_size >= value) {
3398 conn->max_recv_dlength = value;
3402 spin_lock_bh(&session->lock);
3403 if (conn->stop_stage == STOP_CONN_RECOVER)
3405 spin_unlock_bh(&session->lock);
3407 if (value <= PAGE_SIZE)
3408 conn->data = kmalloc(value, flags);
3410 conn->data = (void*)__get_free_pages(flags,
3412 if (conn->data == NULL) {
3413 conn->data = saveptr;
3416 if (conn->data_size <= PAGE_SIZE)
3419 free_pages((unsigned long)saveptr,
3420 get_order(conn->data_size));
3421 conn->max_recv_dlength = value;
3422 conn->data_size = value;
3425 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3426 conn->max_xmit_dlength = value;
3428 case ISCSI_PARAM_HDRDGST_EN:
3429 conn->hdrdgst_en = value;
3430 conn->hdr_size = sizeof(struct iscsi_hdr);
3431 if (conn->hdrdgst_en) {
3432 conn->hdr_size += sizeof(__u32);
3434 conn->tx_tfm = crypto_alloc_tfm("crc32c", 0);
3438 conn->rx_tfm = crypto_alloc_tfm("crc32c", 0);
3439 if (!conn->rx_tfm) {
3440 crypto_free_tfm(conn->tx_tfm);
3445 crypto_free_tfm(conn->tx_tfm);
3447 crypto_free_tfm(conn->rx_tfm);
3450 case ISCSI_PARAM_DATADGST_EN:
3451 conn->datadgst_en = value;
3452 if (conn->datadgst_en) {
3453 if (!conn->data_tx_tfm)
3455 crypto_alloc_tfm("crc32c", 0);
3456 if (!conn->data_tx_tfm)
3458 if (!conn->data_rx_tfm)
3460 crypto_alloc_tfm("crc32c", 0);
3461 if (!conn->data_rx_tfm) {
3462 crypto_free_tfm(conn->data_tx_tfm);
3466 if (conn->data_tx_tfm)
3467 crypto_free_tfm(conn->data_tx_tfm);
3468 if (conn->data_rx_tfm)
3469 crypto_free_tfm(conn->data_rx_tfm);
3472 case ISCSI_PARAM_INITIAL_R2T_EN:
3473 session->initial_r2t_en = value;
3475 case ISCSI_PARAM_MAX_R2T:
3476 if (session->max_r2t == roundup_pow_of_two(value))
3478 iscsi_r2tpool_free(session);
3479 session->max_r2t = value;
3480 if (session->max_r2t & (session->max_r2t - 1))
3481 session->max_r2t = roundup_pow_of_two(session->max_r2t);
3482 if (iscsi_r2tpool_alloc(session))
3485 case ISCSI_PARAM_IMM_DATA_EN:
3486 session->imm_data_en = value;
3488 case ISCSI_PARAM_FIRST_BURST:
3489 session->first_burst = value;
3491 case ISCSI_PARAM_MAX_BURST:
3492 session->max_burst = value;
3494 case ISCSI_PARAM_PDU_INORDER_EN:
3495 session->pdu_inorder_en = value;
3497 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3498 session->dataseq_inorder_en = value;
3500 case ISCSI_PARAM_ERL:
3501 session->erl = value;
3503 case ISCSI_PARAM_IFMARKER_EN:
3505 session->ifmarker_en = value;
3507 case ISCSI_PARAM_OFMARKER_EN:
3509 session->ofmarker_en = value;
3519 iscsi_conn_get_param(iscsi_connh_t connh, enum iscsi_param param,
3522 struct iscsi_conn *conn = iscsi_ptr(connh);
3523 struct iscsi_session *session = conn->session;
3526 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3527 *value = conn->max_recv_dlength;
3529 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3530 *value = conn->max_xmit_dlength;
3532 case ISCSI_PARAM_HDRDGST_EN:
3533 *value = conn->hdrdgst_en;
3535 case ISCSI_PARAM_DATADGST_EN:
3536 *value = conn->datadgst_en;
3538 case ISCSI_PARAM_INITIAL_R2T_EN:
3539 *value = session->initial_r2t_en;
3541 case ISCSI_PARAM_MAX_R2T:
3542 *value = session->max_r2t;
3544 case ISCSI_PARAM_IMM_DATA_EN:
3545 *value = session->imm_data_en;
3547 case ISCSI_PARAM_FIRST_BURST:
3548 *value = session->first_burst;
3550 case ISCSI_PARAM_MAX_BURST:
3551 *value = session->max_burst;
3553 case ISCSI_PARAM_PDU_INORDER_EN:
3554 *value = session->pdu_inorder_en;
3556 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3557 *value = session->dataseq_inorder_en;
3559 case ISCSI_PARAM_ERL:
3560 *value = session->erl;
3562 case ISCSI_PARAM_IFMARKER_EN:
3563 *value = session->ifmarker_en;
3565 case ISCSI_PARAM_OFMARKER_EN:
3566 *value = session->ofmarker_en;
3569 return ISCSI_ERR_PARAM_NOT_FOUND;
3576 iscsi_conn_get_stats(iscsi_connh_t connh, struct iscsi_stats *stats)
3578 struct iscsi_conn *conn = iscsi_ptr(connh);
3580 stats->txdata_octets = conn->txdata_octets;
3581 stats->rxdata_octets = conn->rxdata_octets;
3582 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
3583 stats->dataout_pdus = conn->dataout_pdus_cnt;
3584 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
3585 stats->datain_pdus = conn->datain_pdus_cnt;
3586 stats->r2t_pdus = conn->r2t_pdus_cnt;
3587 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
3588 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
3589 stats->custom_length = 3;
3590 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
3591 stats->custom[0].value = conn->sendpage_failures_cnt;
3592 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
3593 stats->custom[1].value = conn->discontiguous_hdr_cnt;
3594 strcpy(stats->custom[2].desc, "eh_abort_cnt");
3595 stats->custom[2].value = conn->eh_abort_cnt;
3599 iscsi_conn_send_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr, char *data,
3602 struct iscsi_conn *conn = iscsi_ptr(connh);
3605 mutex_lock(&conn->xmitmutex);
3606 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
3607 mutex_unlock(&conn->xmitmutex);
3612 static struct iscsi_transport iscsi_tcp_transport = {
3613 .owner = THIS_MODULE,
3615 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
3617 .host_template = &iscsi_sht,
3618 .hostdata_size = sizeof(struct iscsi_session),
3620 .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
3621 .create_session = iscsi_session_create,
3622 .destroy_session = iscsi_session_destroy,
3623 .create_conn = iscsi_conn_create,
3624 .bind_conn = iscsi_conn_bind,
3625 .destroy_conn = iscsi_conn_destroy,
3626 .set_param = iscsi_conn_set_param,
3627 .get_param = iscsi_conn_get_param,
3628 .start_conn = iscsi_conn_start,
3629 .stop_conn = iscsi_conn_stop,
3630 .send_pdu = iscsi_conn_send_pdu,
3631 .get_stats = iscsi_conn_get_stats,
3635 iscsi_tcp_init(void)
3639 if (iscsi_max_lun < 1) {
3640 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
3643 iscsi_tcp_transport.max_lun = iscsi_max_lun;
3645 taskcache = kmem_cache_create("iscsi_taskcache",
3646 sizeof(struct iscsi_data_task), 0,
3647 SLAB_HWCACHE_ALIGN | SLAB_NO_REAP, NULL, NULL);
3651 error = iscsi_register_transport(&iscsi_tcp_transport);
3653 kmem_cache_destroy(taskcache);
3659 iscsi_tcp_exit(void)
3661 iscsi_unregister_transport(&iscsi_tcp_transport);
3662 kmem_cache_destroy(taskcache);
3665 module_init(iscsi_tcp_init);
3666 module_exit(iscsi_tcp_exit);