2 * iSCSI Initiator over TCP/IP Data-Path
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
6 * Copyright (C) 2005 - 2006 Mike Christie
7 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
8 * maintained by open-iscsi@googlegroups.com
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published
12 * by the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * See the file COPYING included with this distribution for more details.
29 #include <linux/types.h>
30 #include <linux/list.h>
31 #include <linux/inet.h>
32 #include <linux/file.h>
33 #include <linux/blkdev.h>
34 #include <linux/crypto.h>
35 #include <linux/delay.h>
36 #include <linux/kfifo.h>
37 #include <linux/scatterlist.h>
39 #include <scsi/scsi_cmnd.h>
40 #include <scsi/scsi_device.h>
41 #include <scsi/scsi_host.h>
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_transport_iscsi.h>
45 #include "iscsi_tcp.h"
47 MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
48 "Alex Aizman <itn780@yahoo.com>");
49 MODULE_DESCRIPTION("iSCSI/TCP data-path");
50 MODULE_LICENSE("GPL");
55 #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)
57 #define debug_tcp(fmt...)
67 static unsigned int iscsi_max_lun = 512;
68 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
70 static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
71 struct iscsi_chunk *chunk);
74 iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
76 ibuf->sg.page = virt_to_page(vbuf);
77 ibuf->sg.offset = offset_in_page(vbuf);
78 ibuf->sg.length = size;
80 ibuf->use_sendmsg = 1;
84 iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
86 ibuf->sg.page = sg->page;
87 ibuf->sg.offset = sg->offset;
88 ibuf->sg.length = sg->length;
90 * Fastpath: sg element fits into single page
92 if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page))
93 ibuf->use_sendmsg = 0;
95 ibuf->use_sendmsg = 1;
100 iscsi_buf_left(struct iscsi_buf *ibuf)
104 rc = ibuf->sg.length - ibuf->sent;
110 iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
113 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
115 crypto_hash_digest(&tcp_conn->tx_hash, &buf->sg, buf->sg.length, crc);
116 buf->sg.length += sizeof(u32);
120 * Scatterlist handling: inside the iscsi_chunk, we
121 * remember an index into the scatterlist, and set data/size
122 * to the current scatterlist entry. For highmem pages, we
125 * Note that the page is unmapped when we return from
126 * TCP's data_ready handler, so we may end up mapping and
127 * unmapping the same page repeatedly. The whole reason
128 * for this is that we shouldn't keep the page mapped
129 * outside the softirq.
133 * iscsi_tcp_chunk_init_sg - init indicated scatterlist entry
134 * @chunk: the buffer object
135 * @idx: index into scatterlist
136 * @offset: byte offset into that sg entry
138 * This function sets up the chunk so that subsequent
139 * data is copied to the indicated sg entry, at the given
143 iscsi_tcp_chunk_init_sg(struct iscsi_chunk *chunk,
144 unsigned int idx, unsigned int offset)
146 struct scatterlist *sg;
148 BUG_ON(chunk->sg == NULL);
150 sg = &chunk->sg[idx];
151 chunk->sg_index = idx;
152 chunk->sg_offset = offset;
153 chunk->size = min(sg->length - offset, chunk->total_size);
158 * iscsi_tcp_chunk_map - map the current S/G page
159 * @chunk: iscsi chunk
161 * We only need to possibly kmap data if scatter lists are being used,
162 * because the iscsi passthrough and internal IO paths will never use high
166 iscsi_tcp_chunk_map(struct iscsi_chunk *chunk)
168 struct scatterlist *sg;
170 if (chunk->data != NULL || !chunk->sg)
173 sg = &chunk->sg[chunk->sg_index];
174 BUG_ON(chunk->sg_mapped);
175 BUG_ON(sg->length == 0);
176 chunk->sg_mapped = kmap_atomic(sg->page, KM_SOFTIRQ0);
177 chunk->data = chunk->sg_mapped + sg->offset + chunk->sg_offset;
181 iscsi_tcp_chunk_unmap(struct iscsi_chunk *chunk)
183 if (chunk->sg_mapped) {
184 kunmap_atomic(chunk->sg_mapped, KM_SOFTIRQ0);
185 chunk->sg_mapped = NULL;
191 * Splice the digest buffer into the buffer
194 iscsi_tcp_chunk_splice_digest(struct iscsi_chunk *chunk, void *digest)
196 chunk->data = digest;
197 chunk->digest_len = ISCSI_DIGEST_SIZE;
198 chunk->total_size += ISCSI_DIGEST_SIZE;
199 chunk->size = ISCSI_DIGEST_SIZE;
207 * iscsi_tcp_chunk_done - check whether the chunk is complete
208 * @chunk: iscsi chunk to check
210 * Check if we're done receiving this chunk. If the receive
211 * buffer is full but we expect more data, move on to the
212 * next entry in the scatterlist.
214 * If the amount of data we received isn't a multiple of 4,
215 * we will transparently receive the pad bytes, too.
217 * This function must be re-entrant.
220 iscsi_tcp_chunk_done(struct iscsi_chunk *chunk)
222 static unsigned char padbuf[ISCSI_PAD_LEN];
224 if (chunk->copied < chunk->size) {
225 iscsi_tcp_chunk_map(chunk);
229 chunk->total_copied += chunk->copied;
233 /* Unmap the current scatterlist page, if there is one. */
234 iscsi_tcp_chunk_unmap(chunk);
236 /* Do we have more scatterlist entries? */
237 if (chunk->total_copied < chunk->total_size) {
238 /* Proceed to the next entry in the scatterlist. */
239 iscsi_tcp_chunk_init_sg(chunk, chunk->sg_index + 1, 0);
240 iscsi_tcp_chunk_map(chunk);
241 BUG_ON(chunk->size == 0);
245 /* Do we need to handle padding? */
246 if (chunk->total_copied & (ISCSI_PAD_LEN-1)) {
249 pad = ISCSI_PAD_LEN - (chunk->total_copied & (ISCSI_PAD_LEN-1));
250 debug_tcp("consume %d pad bytes\n", pad);
251 chunk->total_size += pad;
253 chunk->data = padbuf;
258 * Set us up for receiving the data digest. hdr digest
259 * is completely handled in hdr done function.
262 if (chunk->digest_len == 0) {
263 crypto_hash_final(chunk->hash, chunk->digest);
264 iscsi_tcp_chunk_splice_digest(chunk,
274 * iscsi_tcp_chunk_recv - copy data to chunk
275 * @tcp_conn: the iSCSI TCP connection
276 * @chunk: the buffer to copy to
278 * @len: amount of data available
280 * This function copies up to @len bytes to the
281 * given buffer, and returns the number of bytes
282 * consumed, which can actually be less than @len.
284 * If hash digest is enabled, the function will update the
285 * hash while copying.
286 * Combining these two operations doesn't buy us a lot (yet),
287 * but in the future we could implement combined copy+crc,
288 * just way we do for network layer checksums.
291 iscsi_tcp_chunk_recv(struct iscsi_tcp_conn *tcp_conn,
292 struct iscsi_chunk *chunk, const void *ptr,
295 struct scatterlist sg;
296 unsigned int copy, copied = 0;
298 while (!iscsi_tcp_chunk_done(chunk)) {
302 copy = min(len - copied, chunk->size - chunk->copied);
303 memcpy(chunk->data + chunk->copied, ptr + copied, copy);
306 sg_init_one(&sg, ptr + copied, copy);
307 crypto_hash_update(chunk->hash, &sg, copy);
309 chunk->copied += copy;
318 iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen,
319 unsigned char digest[ISCSI_DIGEST_SIZE])
321 struct scatterlist sg;
323 sg_init_one(&sg, hdr, hdrlen);
324 crypto_hash_digest(hash, &sg, hdrlen, digest);
328 iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn,
329 struct iscsi_chunk *chunk)
331 if (!chunk->digest_len)
334 if (memcmp(chunk->recv_digest, chunk->digest, chunk->digest_len)) {
335 debug_scsi("digest mismatch\n");
343 * Helper function to set up chunk buffer
346 __iscsi_chunk_init(struct iscsi_chunk *chunk, size_t size,
347 iscsi_chunk_done_fn_t *done, struct hash_desc *hash)
349 memset(chunk, 0, sizeof(*chunk));
350 chunk->total_size = size;
355 crypto_hash_init(hash);
360 iscsi_chunk_init_linear(struct iscsi_chunk *chunk, void *data, size_t size,
361 iscsi_chunk_done_fn_t *done, struct hash_desc *hash)
363 __iscsi_chunk_init(chunk, size, done, hash);
369 iscsi_chunk_seek_sg(struct iscsi_chunk *chunk,
370 struct scatterlist *sg, unsigned int sg_count,
371 unsigned int offset, size_t size,
372 iscsi_chunk_done_fn_t *done, struct hash_desc *hash)
376 __iscsi_chunk_init(chunk, size, done, hash);
377 for (i = 0; i < sg_count; ++i) {
378 if (offset < sg[i].length) {
380 chunk->sg_count = sg_count;
381 iscsi_tcp_chunk_init_sg(chunk, i, offset);
384 offset -= sg[i].length;
387 return ISCSI_ERR_DATA_OFFSET;
391 * iscsi_tcp_hdr_recv_prep - prep chunk for hdr reception
392 * @tcp_conn: iscsi connection to prep for
394 * This function always passes NULL for the hash argument, because when this
395 * function is called we do not yet know the final size of the header and want
396 * to delay the digest processing until we know that.
399 iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn)
401 debug_tcp("iscsi_tcp_hdr_recv_prep(%p%s)\n", tcp_conn,
402 tcp_conn->iscsi_conn->hdrdgst_en ? ", digest enabled" : "");
403 iscsi_chunk_init_linear(&tcp_conn->in.chunk,
404 tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr),
405 iscsi_tcp_hdr_recv_done, NULL);
409 * Handle incoming reply to any other type of command
412 iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn,
413 struct iscsi_chunk *chunk)
415 struct iscsi_conn *conn = tcp_conn->iscsi_conn;
418 if (!iscsi_tcp_dgst_verify(tcp_conn, chunk))
419 return ISCSI_ERR_DATA_DGST;
421 rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr,
422 conn->data, tcp_conn->in.datalen);
426 iscsi_tcp_hdr_recv_prep(tcp_conn);
431 iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn)
433 struct iscsi_conn *conn = tcp_conn->iscsi_conn;
434 struct hash_desc *rx_hash = NULL;
436 if (conn->datadgst_en)
437 rx_hash = &tcp_conn->rx_hash;
439 iscsi_chunk_init_linear(&tcp_conn->in.chunk,
440 conn->data, tcp_conn->in.datalen,
441 iscsi_tcp_data_recv_done, rx_hash);
445 * must be called with session lock
448 iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
450 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
451 struct iscsi_r2t_info *r2t;
452 struct scsi_cmnd *sc;
454 /* flush ctask's r2t queues */
455 while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
456 __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
458 debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n");
465 tcp_ctask->xmstate = XMSTATE_IDLE;
466 tcp_ctask->r2t = NULL;
470 * iscsi_data_rsp - SCSI Data-In Response processing
471 * @conn: iscsi connection
472 * @ctask: scsi command task
475 iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
477 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
478 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
479 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
480 struct iscsi_session *session = conn->session;
481 struct scsi_cmnd *sc = ctask->sc;
482 int datasn = be32_to_cpu(rhdr->datasn);
484 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
486 * setup Data-In byte counter (gets decremented..)
488 ctask->data_count = tcp_conn->in.datalen;
490 if (tcp_conn->in.datalen == 0)
493 if (tcp_ctask->exp_datasn != datasn) {
494 debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->datasn(%d)\n",
495 __FUNCTION__, tcp_ctask->exp_datasn, datasn);
496 return ISCSI_ERR_DATASN;
499 tcp_ctask->exp_datasn++;
501 tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
502 if (tcp_ctask->data_offset + tcp_conn->in.datalen > scsi_bufflen(sc)) {
503 debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",
504 __FUNCTION__, tcp_ctask->data_offset,
505 tcp_conn->in.datalen, scsi_bufflen(sc));
506 return ISCSI_ERR_DATA_OFFSET;
509 if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
510 sc->result = (DID_OK << 16) | rhdr->cmd_status;
511 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
512 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
513 ISCSI_FLAG_DATA_OVERFLOW)) {
514 int res_count = be32_to_cpu(rhdr->residual_count);
517 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
518 res_count <= scsi_bufflen(sc)))
519 scsi_set_resid(sc, res_count);
521 sc->result = (DID_BAD_TARGET << 16) |
526 conn->datain_pdus_cnt++;
531 * iscsi_solicit_data_init - initialize first Data-Out
532 * @conn: iscsi connection
533 * @ctask: scsi command task
537 * Initialize first Data-Out within this R2T sequence and finds
538 * proper data_offset within this SCSI command.
540 * This function is called with connection lock taken.
543 iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
544 struct iscsi_r2t_info *r2t)
546 struct iscsi_data *hdr;
547 struct scsi_cmnd *sc = ctask->sc;
549 struct scatterlist *sg;
551 hdr = &r2t->dtask.hdr;
552 memset(hdr, 0, sizeof(struct iscsi_data));
554 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
555 r2t->solicit_datasn++;
556 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
557 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
558 hdr->itt = ctask->hdr->itt;
559 hdr->exp_statsn = r2t->exp_statsn;
560 hdr->offset = cpu_to_be32(r2t->data_offset);
561 if (r2t->data_length > conn->max_xmit_dlength) {
562 hton24(hdr->dlength, conn->max_xmit_dlength);
563 r2t->data_count = conn->max_xmit_dlength;
566 hton24(hdr->dlength, r2t->data_length);
567 r2t->data_count = r2t->data_length;
568 hdr->flags = ISCSI_FLAG_CMD_FINAL;
570 conn->dataout_pdus_cnt++;
574 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
575 sizeof(struct iscsi_hdr));
577 sg = scsi_sglist(sc);
579 for (i = 0; i < scsi_sg_count(sc); i++, sg += 1) {
580 /* FIXME: prefetch ? */
581 if (sg_count + sg->length > r2t->data_offset) {
586 /* offset within this page */
587 page_offset = r2t->data_offset - sg_count;
589 /* fill in this buffer */
590 iscsi_buf_init_sg(&r2t->sendbuf, sg);
591 r2t->sendbuf.sg.offset += page_offset;
592 r2t->sendbuf.sg.length -= page_offset;
594 /* xmit logic will continue with next one */
598 sg_count += sg->length;
600 BUG_ON(r2t->sg == NULL);
604 * iscsi_r2t_rsp - iSCSI R2T Response processing
605 * @conn: iscsi connection
606 * @ctask: scsi command task
609 iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
611 struct iscsi_r2t_info *r2t;
612 struct iscsi_session *session = conn->session;
613 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
614 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
615 struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
616 int r2tsn = be32_to_cpu(rhdr->r2tsn);
619 if (tcp_conn->in.datalen) {
620 printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n",
621 tcp_conn->in.datalen);
622 return ISCSI_ERR_DATALEN;
625 if (tcp_ctask->exp_datasn != r2tsn){
626 debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
627 __FUNCTION__, tcp_ctask->exp_datasn, r2tsn);
628 return ISCSI_ERR_R2TSN;
631 /* fill-in new R2T associated with the task */
632 spin_lock(&session->lock);
633 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
635 if (!ctask->sc || session->state != ISCSI_STATE_LOGGED_IN) {
636 printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
637 "recovery...\n", ctask->itt);
638 spin_unlock(&session->lock);
642 rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
645 r2t->exp_statsn = rhdr->statsn;
646 r2t->data_length = be32_to_cpu(rhdr->data_length);
647 if (r2t->data_length == 0) {
648 printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n");
649 spin_unlock(&session->lock);
650 return ISCSI_ERR_DATALEN;
653 if (r2t->data_length > session->max_burst)
654 debug_scsi("invalid R2T with data len %u and max burst %u."
655 "Attempting to execute request.\n",
656 r2t->data_length, session->max_burst);
658 r2t->data_offset = be32_to_cpu(rhdr->data_offset);
659 if (r2t->data_offset + r2t->data_length > scsi_bufflen(ctask->sc)) {
660 spin_unlock(&session->lock);
661 printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at "
662 "offset %u and total length %d\n", r2t->data_length,
663 r2t->data_offset, scsi_bufflen(ctask->sc));
664 return ISCSI_ERR_DATALEN;
667 r2t->ttt = rhdr->ttt; /* no flip */
668 r2t->solicit_datasn = 0;
670 iscsi_solicit_data_init(conn, ctask, r2t);
672 tcp_ctask->exp_datasn = r2tsn + 1;
673 __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
674 tcp_ctask->xmstate |= XMSTATE_SOL_HDR_INIT;
675 conn->r2t_pdus_cnt++;
677 iscsi_requeue_ctask(ctask);
678 spin_unlock(&session->lock);
684 * Handle incoming reply to DataIn command
687 iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn,
688 struct iscsi_chunk *chunk)
690 struct iscsi_conn *conn = tcp_conn->iscsi_conn;
691 struct iscsi_hdr *hdr = tcp_conn->in.hdr;
694 if (!iscsi_tcp_dgst_verify(tcp_conn, chunk))
695 return ISCSI_ERR_DATA_DGST;
697 /* check for non-exceptional status */
698 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
699 rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
704 iscsi_tcp_hdr_recv_prep(tcp_conn);
709 * iscsi_tcp_hdr_dissect - process PDU header
710 * @conn: iSCSI connection
713 * This function analyzes the header of the PDU received,
714 * and performs several sanity checks. If the PDU is accompanied
715 * by data, the receive buffer is set up to copy the incoming data
716 * to the correct location.
719 iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
721 int rc = 0, opcode, ahslen;
722 struct iscsi_session *session = conn->session;
723 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
724 struct iscsi_cmd_task *ctask;
727 /* verify PDU length */
728 tcp_conn->in.datalen = ntoh24(hdr->dlength);
729 if (tcp_conn->in.datalen > conn->max_recv_dlength) {
730 printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
731 tcp_conn->in.datalen, conn->max_recv_dlength);
732 return ISCSI_ERR_DATALEN;
735 /* Additional header segments. So far, we don't
736 * process additional headers.
738 ahslen = hdr->hlength << 2;
740 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
741 /* verify itt (itt encoding: age+cid+itt) */
742 rc = iscsi_verify_itt(conn, hdr, &itt);
743 if (rc == ISCSI_ERR_NO_SCSI_CMD) {
744 /* XXX: what does this do? */
745 tcp_conn->in.datalen = 0; /* force drop */
750 debug_tcp("opcode 0x%x ahslen %d datalen %d\n",
751 opcode, ahslen, tcp_conn->in.datalen);
754 case ISCSI_OP_SCSI_DATA_IN:
755 ctask = session->cmds[itt];
756 rc = iscsi_data_rsp(conn, ctask);
759 if (tcp_conn->in.datalen) {
760 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
761 struct hash_desc *rx_hash = NULL;
764 * Setup copy of Data-In into the Scsi_Cmnd
766 * We set up the iscsi_chunk to point to the next
767 * scatterlist entry to copy to. As we go along,
768 * we move on to the next scatterlist entry and
769 * update the digest per-entry.
771 if (conn->datadgst_en)
772 rx_hash = &tcp_conn->rx_hash;
774 debug_tcp("iscsi_tcp_begin_data_in(%p, offset=%d, "
775 "datalen=%d)\n", tcp_conn,
776 tcp_ctask->data_offset,
777 tcp_conn->in.datalen);
778 return iscsi_chunk_seek_sg(&tcp_conn->in.chunk,
779 scsi_sglist(ctask->sc),
780 scsi_sg_count(ctask->sc),
781 tcp_ctask->data_offset,
782 tcp_conn->in.datalen,
783 iscsi_tcp_process_data_in,
787 case ISCSI_OP_SCSI_CMD_RSP:
788 if (tcp_conn->in.datalen) {
789 iscsi_tcp_data_recv_prep(tcp_conn);
792 rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
795 ctask = session->cmds[itt];
797 rc = ISCSI_ERR_AHSLEN;
798 else if (ctask->sc->sc_data_direction == DMA_TO_DEVICE)
799 rc = iscsi_r2t_rsp(conn, ctask);
801 rc = ISCSI_ERR_PROTO;
803 case ISCSI_OP_LOGIN_RSP:
804 case ISCSI_OP_TEXT_RSP:
805 case ISCSI_OP_REJECT:
806 case ISCSI_OP_ASYNC_EVENT:
808 * It is possible that we could get a PDU with a buffer larger
809 * than 8K, but there are no targets that currently do this.
810 * For now we fail until we find a vendor that needs it
812 if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) {
813 printk(KERN_ERR "iscsi_tcp: received buffer of len %u "
814 "but conn buffer is only %u (opcode %0x)\n",
815 tcp_conn->in.datalen,
816 ISCSI_DEF_MAX_RECV_SEG_LEN, opcode);
817 rc = ISCSI_ERR_PROTO;
821 /* If there's data coming in with the response,
822 * receive it to the connection's buffer.
824 if (tcp_conn->in.datalen) {
825 iscsi_tcp_data_recv_prep(tcp_conn);
829 case ISCSI_OP_LOGOUT_RSP:
830 case ISCSI_OP_NOOP_IN:
831 case ISCSI_OP_SCSI_TMFUNC_RSP:
832 rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
835 rc = ISCSI_ERR_BAD_OPCODE;
840 /* Anything that comes with data should have
841 * been handled above. */
842 if (tcp_conn->in.datalen)
843 return ISCSI_ERR_PROTO;
844 iscsi_tcp_hdr_recv_prep(tcp_conn);
851 partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg,
852 int offset, int length)
854 struct scatterlist temp;
856 sg_init_table(&temp, 1);
857 sg_set_page(&temp, sg_page(sg), length, offset);
858 crypto_hash_update(desc, &temp, length);
862 * iscsi_tcp_hdr_recv_done - process PDU header
864 * This is the callback invoked when the PDU header has
865 * been received. If the header is followed by additional
866 * header segments, we go back for more data.
869 iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
870 struct iscsi_chunk *chunk)
872 struct iscsi_conn *conn = tcp_conn->iscsi_conn;
873 struct iscsi_hdr *hdr;
875 /* Check if there are additional header segments
876 * *prior* to computing the digest, because we
877 * may need to go back to the caller for more.
879 hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf;
880 if (chunk->copied == sizeof(struct iscsi_hdr) && hdr->hlength) {
881 /* Bump the header length - the caller will
882 * just loop around and get the AHS for us, and
884 unsigned int ahslen = hdr->hlength << 2;
886 /* Make sure we don't overflow */
887 if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf))
888 return ISCSI_ERR_AHSLEN;
890 chunk->total_size += ahslen;
891 chunk->size += ahslen;
895 /* We're done processing the header. See if we're doing
896 * header digests; if so, set up the recv_digest buffer
897 * and go back for more. */
898 if (conn->hdrdgst_en) {
899 if (chunk->digest_len == 0) {
900 iscsi_tcp_chunk_splice_digest(chunk,
904 iscsi_tcp_dgst_header(&tcp_conn->rx_hash, hdr,
905 chunk->total_copied - ISCSI_DIGEST_SIZE,
908 if (!iscsi_tcp_dgst_verify(tcp_conn, chunk))
909 return ISCSI_ERR_HDR_DGST;
912 tcp_conn->in.hdr = hdr;
913 return iscsi_tcp_hdr_dissect(conn, hdr);
917 * iscsi_tcp_recv - TCP receive in sendfile fashion
918 * @rd_desc: read descriptor
919 * @skb: socket buffer
920 * @offset: offset in skb
921 * @len: skb->len - offset
924 iscsi_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
925 unsigned int offset, size_t len)
927 struct iscsi_conn *conn = rd_desc->arg.data;
928 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
929 struct iscsi_chunk *chunk = &tcp_conn->in.chunk;
930 struct skb_seq_state seq;
931 unsigned int consumed = 0;
934 debug_tcp("in %d bytes\n", skb->len - offset);
936 if (unlikely(conn->suspend_rx)) {
937 debug_tcp("conn %d Rx suspended!\n", conn->id);
941 skb_prepare_seq_read(skb, offset, skb->len, &seq);
946 avail = skb_seq_read(consumed, &ptr, &seq);
949 BUG_ON(chunk->copied >= chunk->size);
951 debug_tcp("skb %p ptr=%p avail=%u\n", skb, ptr, avail);
952 rc = iscsi_tcp_chunk_recv(tcp_conn, chunk, ptr, avail);
956 if (chunk->total_copied >= chunk->total_size) {
957 rc = chunk->done(tcp_conn, chunk);
959 skb_abort_seq_read(&seq);
963 /* The done() functions sets up the
968 conn->rxdata_octets += consumed;
972 debug_tcp("Error receiving PDU, errno=%d\n", rc);
973 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
978 iscsi_tcp_data_ready(struct sock *sk, int flag)
980 struct iscsi_conn *conn = sk->sk_user_data;
981 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
982 read_descriptor_t rd_desc;
984 read_lock(&sk->sk_callback_lock);
987 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
988 * We set count to 1 because we want the network layer to
989 * hand us all the skbs that are available. iscsi_tcp_recv
990 * handled pdus that cross buffers or pdus that still need data.
992 rd_desc.arg.data = conn;
994 tcp_read_sock(sk, &rd_desc, iscsi_tcp_recv);
996 read_unlock(&sk->sk_callback_lock);
998 /* If we had to (atomically) map a highmem page,
1000 iscsi_tcp_chunk_unmap(&tcp_conn->in.chunk);
1004 iscsi_tcp_state_change(struct sock *sk)
1006 struct iscsi_tcp_conn *tcp_conn;
1007 struct iscsi_conn *conn;
1008 struct iscsi_session *session;
1009 void (*old_state_change)(struct sock *);
1011 read_lock(&sk->sk_callback_lock);
1013 conn = (struct iscsi_conn*)sk->sk_user_data;
1014 session = conn->session;
1016 if ((sk->sk_state == TCP_CLOSE_WAIT ||
1017 sk->sk_state == TCP_CLOSE) &&
1018 !atomic_read(&sk->sk_rmem_alloc)) {
1019 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1020 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1023 tcp_conn = conn->dd_data;
1024 old_state_change = tcp_conn->old_state_change;
1026 read_unlock(&sk->sk_callback_lock);
1028 old_state_change(sk);
1032 * iscsi_write_space - Called when more output buffer space is available
1033 * @sk: socket space is available for
1036 iscsi_write_space(struct sock *sk)
1038 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
1039 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1041 tcp_conn->old_write_space(sk);
1042 debug_tcp("iscsi_write_space: cid %d\n", conn->id);
1043 scsi_queue_work(conn->session->host, &conn->xmitwork);
1047 iscsi_conn_set_callbacks(struct iscsi_conn *conn)
1049 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1050 struct sock *sk = tcp_conn->sock->sk;
1052 /* assign new callbacks */
1053 write_lock_bh(&sk->sk_callback_lock);
1054 sk->sk_user_data = conn;
1055 tcp_conn->old_data_ready = sk->sk_data_ready;
1056 tcp_conn->old_state_change = sk->sk_state_change;
1057 tcp_conn->old_write_space = sk->sk_write_space;
1058 sk->sk_data_ready = iscsi_tcp_data_ready;
1059 sk->sk_state_change = iscsi_tcp_state_change;
1060 sk->sk_write_space = iscsi_write_space;
1061 write_unlock_bh(&sk->sk_callback_lock);
1065 iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
1067 struct sock *sk = tcp_conn->sock->sk;
1069 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1070 write_lock_bh(&sk->sk_callback_lock);
1071 sk->sk_user_data = NULL;
1072 sk->sk_data_ready = tcp_conn->old_data_ready;
1073 sk->sk_state_change = tcp_conn->old_state_change;
1074 sk->sk_write_space = tcp_conn->old_write_space;
1075 sk->sk_no_check = 0;
1076 write_unlock_bh(&sk->sk_callback_lock);
1080 * iscsi_send - generic send routine
1081 * @sk: kernel's socket
1082 * @buf: buffer to write from
1083 * @size: actual size to write
1084 * @flags: socket's flags
1087 iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags)
1089 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1090 struct socket *sk = tcp_conn->sock;
1091 int offset = buf->sg.offset + buf->sent, res;
1094 * if we got use_sg=0 or are sending something we kmallocd
1095 * then we did not have to do kmap (kmap returns page_address)
1097 * if we got use_sg > 0, but had to drop down, we do not
1098 * set clustering so this should only happen for that
1101 if (buf->use_sendmsg)
1102 res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
1104 res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags);
1107 conn->txdata_octets += res;
1112 tcp_conn->sendpage_failures_cnt++;
1116 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1121 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1122 * @conn: iscsi connection
1123 * @buf: buffer to write from
1124 * @datalen: lenght of data to be sent after the header
1130 iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
1132 int flags = 0; /* MSG_DONTWAIT; */
1135 size = buf->sg.length - buf->sent;
1136 BUG_ON(buf->sent + size > buf->sg.length);
1137 if (buf->sent + size != buf->sg.length || datalen)
1140 res = iscsi_send(conn, buf, size, flags);
1141 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
1152 * iscsi_sendpage - send one page of iSCSI Data-Out.
1153 * @conn: iscsi connection
1154 * @buf: buffer to write from
1155 * @count: remaining data
1156 * @sent: number of bytes sent
1162 iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
1163 int *count, int *sent)
1165 int flags = 0; /* MSG_DONTWAIT; */
1168 size = buf->sg.length - buf->sent;
1169 BUG_ON(buf->sent + size > buf->sg.length);
1172 if (buf->sent + size != buf->sg.length || *count != size)
1175 res = iscsi_send(conn, buf, size, flags);
1176 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1177 size, buf->sent, *count, *sent, res);
1190 iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
1191 struct iscsi_tcp_cmd_task *tcp_ctask)
1193 crypto_hash_init(&tcp_conn->tx_hash);
1194 tcp_ctask->digest_count = 4;
1198 * iscsi_solicit_data_cont - initialize next Data-Out
1199 * @conn: iscsi connection
1200 * @ctask: scsi command task
1202 * @left: bytes left to transfer
1205 * Initialize next Data-Out within this R2T sequence and continue
1206 * to process next Scatter-Gather element(if any) of this SCSI command.
1208 * Called under connection lock.
1211 iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1212 struct iscsi_r2t_info *r2t, int left)
1214 struct iscsi_data *hdr;
1217 hdr = &r2t->dtask.hdr;
1218 memset(hdr, 0, sizeof(struct iscsi_data));
1219 hdr->ttt = r2t->ttt;
1220 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
1221 r2t->solicit_datasn++;
1222 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1223 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1224 hdr->itt = ctask->hdr->itt;
1225 hdr->exp_statsn = r2t->exp_statsn;
1226 new_offset = r2t->data_offset + r2t->sent;
1227 hdr->offset = cpu_to_be32(new_offset);
1228 if (left > conn->max_xmit_dlength) {
1229 hton24(hdr->dlength, conn->max_xmit_dlength);
1230 r2t->data_count = conn->max_xmit_dlength;
1232 hton24(hdr->dlength, left);
1233 r2t->data_count = left;
1234 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1236 conn->dataout_pdus_cnt++;
1238 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
1239 sizeof(struct iscsi_hdr));
1241 if (iscsi_buf_left(&r2t->sendbuf))
1244 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1248 static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask,
1251 tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1);
1252 if (!tcp_ctask->pad_count)
1255 tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count;
1256 debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count);
1257 tcp_ctask->xmstate |= XMSTATE_W_PAD;
1261 * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1262 * @conn: iscsi connection
1263 * @ctask: scsi command task
1267 iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
1269 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1271 BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
1272 tcp_ctask->xmstate = XMSTATE_CMD_HDR_INIT;
1276 * iscsi_tcp_mtask_xmit - xmit management(immediate) task
1277 * @conn: iscsi connection
1278 * @mtask: task management task
1281 * The function can return -EAGAIN in which case caller must
1282 * call it again later, or recover. '0' return code means successful
1285 * Management xmit state machine consists of these states:
1286 * XMSTATE_IMM_HDR_INIT - calculate digest of PDU Header
1287 * XMSTATE_IMM_HDR - PDU Header xmit in progress
1288 * XMSTATE_IMM_DATA - PDU Data xmit in progress
1289 * XMSTATE_IDLE - management PDU is done
1292 iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
1294 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
1297 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1298 conn->id, tcp_mtask->xmstate, mtask->itt);
1300 if (tcp_mtask->xmstate & XMSTATE_IMM_HDR_INIT) {
1301 iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
1302 sizeof(struct iscsi_hdr));
1304 if (mtask->data_count) {
1305 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
1306 iscsi_buf_init_iov(&tcp_mtask->sendbuf,
1311 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
1312 conn->stop_stage != STOP_CONN_RECOVER &&
1314 iscsi_hdr_digest(conn, &tcp_mtask->headbuf,
1315 (u8*)tcp_mtask->hdrext);
1317 tcp_mtask->sent = 0;
1318 tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR_INIT;
1319 tcp_mtask->xmstate |= XMSTATE_IMM_HDR;
1322 if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) {
1323 rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
1327 tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR;
1330 if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) {
1331 BUG_ON(!mtask->data_count);
1332 tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
1333 /* FIXME: implement.
1334 * Virtual buffer could be spreaded across multiple pages...
1339 rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf,
1340 &mtask->data_count, &tcp_mtask->sent);
1342 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
1345 } while (mtask->data_count);
1348 BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE);
1349 if (mtask->hdr->itt == RESERVED_ITT) {
1350 struct iscsi_session *session = conn->session;
1352 spin_lock_bh(&session->lock);
1353 list_del(&conn->mtask->running);
1354 __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask,
1356 spin_unlock_bh(&session->lock);
1362 iscsi_send_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1364 struct scsi_cmnd *sc = ctask->sc;
1365 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1368 if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_INIT) {
1369 tcp_ctask->sent = 0;
1370 tcp_ctask->sg_count = 0;
1371 tcp_ctask->exp_datasn = 0;
1373 if (sc->sc_data_direction == DMA_TO_DEVICE) {
1374 struct scatterlist *sg = scsi_sglist(sc);
1376 iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
1377 tcp_ctask->sg = sg + 1;
1378 tcp_ctask->bad_sg = sg + scsi_sg_count(sc);
1380 debug_scsi("cmd [itt 0x%x total %d imm_data %d "
1381 "unsol count %d, unsol offset %d]\n",
1382 ctask->itt, scsi_bufflen(sc),
1383 ctask->imm_count, ctask->unsol_count,
1384 ctask->unsol_offset);
1387 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
1388 sizeof(struct iscsi_hdr));
1390 if (conn->hdrdgst_en)
1391 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1392 (u8*)tcp_ctask->hdrext);
1393 tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_INIT;
1394 tcp_ctask->xmstate |= XMSTATE_CMD_HDR_XMIT;
1397 if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_XMIT) {
1398 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
1401 tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_XMIT;
1403 if (sc->sc_data_direction != DMA_TO_DEVICE)
1406 if (ctask->imm_count) {
1407 tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
1408 iscsi_set_padding(tcp_ctask, ctask->imm_count);
1410 if (ctask->conn->datadgst_en) {
1411 iscsi_data_digest_init(ctask->conn->dd_data,
1413 tcp_ctask->immdigest = 0;
1417 if (ctask->unsol_count)
1418 tcp_ctask->xmstate |=
1419 XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
1425 iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1427 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1428 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1431 if (tcp_ctask->xmstate & XMSTATE_W_PAD) {
1432 iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad,
1433 tcp_ctask->pad_count);
1434 if (conn->datadgst_en)
1435 crypto_hash_update(&tcp_conn->tx_hash,
1436 &tcp_ctask->sendbuf.sg,
1437 tcp_ctask->sendbuf.sg.length);
1438 } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD))
1441 tcp_ctask->xmstate &= ~XMSTATE_W_PAD;
1442 tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD;
1443 debug_scsi("sending %d pad bytes for itt 0x%x\n",
1444 tcp_ctask->pad_count, ctask->itt);
1445 rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count,
1448 debug_scsi("padding send failed %d\n", rc);
1449 tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD;
1455 iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1456 struct iscsi_buf *buf, uint32_t *digest)
1458 struct iscsi_tcp_cmd_task *tcp_ctask;
1459 struct iscsi_tcp_conn *tcp_conn;
1462 if (!conn->datadgst_en)
1465 tcp_ctask = ctask->dd_data;
1466 tcp_conn = conn->dd_data;
1468 if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) {
1469 crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest);
1470 iscsi_buf_init_iov(buf, (char*)digest, 4);
1472 tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST;
1474 rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent);
1476 debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest,
1479 debug_scsi("sending digest 0x%x failed for itt 0x%x!\n",
1480 *digest, ctask->itt);
1481 tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST;
1487 iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf,
1488 struct scatterlist **sg, int *sent, int *count,
1489 struct iscsi_buf *digestbuf, uint32_t *digest)
1491 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1492 struct iscsi_conn *conn = ctask->conn;
1493 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1494 int rc, buf_sent, offset;
1498 offset = sendbuf->sent;
1500 rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent);
1501 *sent = *sent + buf_sent;
1502 if (buf_sent && conn->datadgst_en)
1503 partial_sg_digest_update(&tcp_conn->tx_hash,
1504 &sendbuf->sg, sendbuf->sg.offset + offset,
1506 if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) {
1507 iscsi_buf_init_sg(sendbuf, *sg);
1515 rc = iscsi_send_padding(conn, ctask);
1519 return iscsi_send_digest(conn, ctask, digestbuf, digest);
1523 iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1525 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1526 struct iscsi_data_task *dtask;
1529 tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
1530 if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
1531 dtask = &tcp_ctask->unsol_dtask;
1533 iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr);
1534 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
1535 sizeof(struct iscsi_hdr));
1536 if (conn->hdrdgst_en)
1537 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1538 (u8*)dtask->hdrext);
1540 tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT;
1541 iscsi_set_padding(tcp_ctask, ctask->data_count);
1544 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
1546 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1547 tcp_ctask->xmstate |= XMSTATE_UNS_HDR;
1551 if (conn->datadgst_en) {
1552 dtask = &tcp_ctask->unsol_dtask;
1553 iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
1557 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1558 ctask->itt, ctask->unsol_count, tcp_ctask->sent);
1563 iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1565 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1568 if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) {
1569 BUG_ON(!ctask->unsol_count);
1570 tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR;
1572 rc = iscsi_send_unsol_hdr(conn, ctask);
1577 if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) {
1578 struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask;
1579 int start = tcp_ctask->sent;
1581 rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
1582 &tcp_ctask->sent, &ctask->data_count,
1583 &dtask->digestbuf, &dtask->digest);
1584 ctask->unsol_count -= tcp_ctask->sent - start;
1587 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1589 * Done with the Data-Out. Next, check if we need
1590 * to send another unsolicited Data-Out.
1592 if (ctask->unsol_count) {
1593 debug_scsi("sending more uns\n");
1594 tcp_ctask->xmstate |= XMSTATE_UNS_INIT;
1601 static int iscsi_send_sol_pdu(struct iscsi_conn *conn,
1602 struct iscsi_cmd_task *ctask)
1604 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1605 struct iscsi_session *session = conn->session;
1606 struct iscsi_r2t_info *r2t;
1607 struct iscsi_data_task *dtask;
1610 if (tcp_ctask->xmstate & XMSTATE_SOL_HDR_INIT) {
1611 if (!tcp_ctask->r2t) {
1612 spin_lock_bh(&session->lock);
1613 __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
1615 spin_unlock_bh(&session->lock);
1618 r2t = tcp_ctask->r2t;
1619 dtask = &r2t->dtask;
1621 if (conn->hdrdgst_en)
1622 iscsi_hdr_digest(conn, &r2t->headbuf,
1623 (u8*)dtask->hdrext);
1624 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR_INIT;
1625 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
1628 if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
1629 r2t = tcp_ctask->r2t;
1630 dtask = &r2t->dtask;
1632 rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
1635 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1636 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1638 if (conn->datadgst_en) {
1639 iscsi_data_digest_init(conn->dd_data, tcp_ctask);
1643 iscsi_set_padding(tcp_ctask, r2t->data_count);
1644 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
1645 r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
1649 if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) {
1650 r2t = tcp_ctask->r2t;
1651 dtask = &r2t->dtask;
1653 rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg,
1654 &r2t->sent, &r2t->data_count,
1655 &dtask->digestbuf, &dtask->digest);
1658 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
1661 * Done with this Data-Out. Next, check if we have
1662 * to send another Data-Out for this R2T.
1664 BUG_ON(r2t->data_length - r2t->sent < 0);
1665 left = r2t->data_length - r2t->sent;
1667 iscsi_solicit_data_cont(conn, ctask, r2t, left);
1672 * Done with this R2T. Check if there are more
1673 * outstanding R2Ts ready to be processed.
1675 spin_lock_bh(&session->lock);
1676 tcp_ctask->r2t = NULL;
1677 __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
1679 if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t,
1681 tcp_ctask->r2t = r2t;
1682 spin_unlock_bh(&session->lock);
1685 spin_unlock_bh(&session->lock);
1691 * iscsi_tcp_ctask_xmit - xmit normal PDU task
1692 * @conn: iscsi connection
1693 * @ctask: iscsi command task
1696 * The function can return -EAGAIN in which case caller must
1697 * call it again later, or recover. '0' return code means successful
1699 * The function is devided to logical helpers (above) for the different
1702 *iscsi_send_cmd_hdr()
1703 * XMSTATE_CMD_HDR_INIT - prepare Header and Data buffers Calculate
1705 * XMSTATE_CMD_HDR_XMIT - Transmit header in progress
1708 * XMSTATE_W_PAD - Prepare and send pading
1709 * XMSTATE_W_RESEND_PAD - retry send pading
1712 * XMSTATE_W_RESEND_DATA_DIGEST - Finalize and send Data Digest
1713 * XMSTATE_W_RESEND_DATA_DIGEST - retry sending digest
1715 *iscsi_send_unsol_hdr
1716 * XMSTATE_UNS_INIT - prepare un-solicit data header and digest
1717 * XMSTATE_UNS_HDR - send un-solicit header
1719 *iscsi_send_unsol_pdu
1720 * XMSTATE_UNS_DATA - send un-solicit data in progress
1723 * XMSTATE_SOL_HDR_INIT - solicit data header and digest initialize
1724 * XMSTATE_SOL_HDR - send solicit header
1725 * XMSTATE_SOL_DATA - send solicit data
1727 *iscsi_tcp_ctask_xmit
1728 * XMSTATE_IMM_DATA - xmit managment data (??)
1731 iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1733 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1736 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
1737 conn->id, tcp_ctask->xmstate, ctask->itt);
1739 rc = iscsi_send_cmd_hdr(conn, ctask);
1742 if (ctask->sc->sc_data_direction != DMA_TO_DEVICE)
1745 if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) {
1746 rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
1747 &tcp_ctask->sent, &ctask->imm_count,
1748 &tcp_ctask->immbuf, &tcp_ctask->immdigest);
1751 tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA;
1754 rc = iscsi_send_unsol_pdu(conn, ctask);
1758 rc = iscsi_send_sol_pdu(conn, ctask);
1765 static struct iscsi_cls_conn *
1766 iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1768 struct iscsi_conn *conn;
1769 struct iscsi_cls_conn *cls_conn;
1770 struct iscsi_tcp_conn *tcp_conn;
1772 cls_conn = iscsi_conn_setup(cls_session, conn_idx);
1775 conn = cls_conn->dd_data;
1777 * due to strange issues with iser these are not set
1778 * in iscsi_conn_setup
1780 conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN;
1782 tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
1784 goto tcp_conn_alloc_fail;
1786 conn->dd_data = tcp_conn;
1787 tcp_conn->iscsi_conn = conn;
1789 tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
1791 tcp_conn->tx_hash.flags = 0;
1792 if (IS_ERR(tcp_conn->tx_hash.tfm)) {
1793 printk(KERN_ERR "Could not create connection due to crc32c "
1794 "loading error %ld. Make sure the crc32c module is "
1795 "built as a module or into the kernel\n",
1796 PTR_ERR(tcp_conn->tx_hash.tfm));
1800 tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
1802 tcp_conn->rx_hash.flags = 0;
1803 if (IS_ERR(tcp_conn->rx_hash.tfm)) {
1804 printk(KERN_ERR "Could not create connection due to crc32c "
1805 "loading error %ld. Make sure the crc32c module is "
1806 "built as a module or into the kernel\n",
1807 PTR_ERR(tcp_conn->rx_hash.tfm));
1814 crypto_free_hash(tcp_conn->tx_hash.tfm);
1817 tcp_conn_alloc_fail:
1818 iscsi_conn_teardown(cls_conn);
1823 iscsi_tcp_release_conn(struct iscsi_conn *conn)
1825 struct iscsi_session *session = conn->session;
1826 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1827 struct socket *sock = tcp_conn->sock;
1832 sock_hold(sock->sk);
1833 iscsi_conn_restore_callbacks(tcp_conn);
1836 spin_lock_bh(&session->lock);
1837 tcp_conn->sock = NULL;
1838 conn->recv_lock = NULL;
1839 spin_unlock_bh(&session->lock);
1844 iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
1846 struct iscsi_conn *conn = cls_conn->dd_data;
1847 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1849 iscsi_tcp_release_conn(conn);
1850 iscsi_conn_teardown(cls_conn);
1852 if (tcp_conn->tx_hash.tfm)
1853 crypto_free_hash(tcp_conn->tx_hash.tfm);
1854 if (tcp_conn->rx_hash.tfm)
1855 crypto_free_hash(tcp_conn->rx_hash.tfm);
1861 iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1863 struct iscsi_conn *conn = cls_conn->dd_data;
1865 iscsi_conn_stop(cls_conn, flag);
1866 iscsi_tcp_release_conn(conn);
1869 static int iscsi_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock,
1870 char *buf, int *port,
1871 int (*getname)(struct socket *, struct sockaddr *,
1874 struct sockaddr_storage *addr;
1875 struct sockaddr_in6 *sin6;
1876 struct sockaddr_in *sin;
1879 addr = kmalloc(sizeof(*addr), GFP_KERNEL);
1883 if (getname(sock, (struct sockaddr *) addr, &len)) {
1888 switch (addr->ss_family) {
1890 sin = (struct sockaddr_in *)addr;
1891 spin_lock_bh(&conn->session->lock);
1892 sprintf(buf, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr));
1893 *port = be16_to_cpu(sin->sin_port);
1894 spin_unlock_bh(&conn->session->lock);
1897 sin6 = (struct sockaddr_in6 *)addr;
1898 spin_lock_bh(&conn->session->lock);
1899 sprintf(buf, NIP6_FMT, NIP6(sin6->sin6_addr));
1900 *port = be16_to_cpu(sin6->sin6_port);
1901 spin_unlock_bh(&conn->session->lock);
1910 iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
1911 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
1914 struct iscsi_conn *conn = cls_conn->dd_data;
1915 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1917 struct socket *sock;
1920 /* lookup for existing socket */
1921 sock = sockfd_lookup((int)transport_eph, &err);
1923 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
1927 * copy these values now because if we drop the session
1928 * userspace may still want to query the values since we will
1929 * be using them for the reconnect
1931 err = iscsi_tcp_get_addr(conn, sock, conn->portal_address,
1932 &conn->portal_port, kernel_getpeername);
1936 err = iscsi_tcp_get_addr(conn, sock, conn->local_address,
1937 &conn->local_port, kernel_getsockname);
1941 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
1945 /* bind iSCSI connection and socket */
1946 tcp_conn->sock = sock;
1948 /* setup Socket parameters */
1951 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
1952 sk->sk_allocation = GFP_ATOMIC;
1954 /* FIXME: disable Nagle's algorithm */
1957 * Intercept TCP callbacks for sendfile like receive
1960 conn->recv_lock = &sk->sk_callback_lock;
1961 iscsi_conn_set_callbacks(conn);
1962 tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
1964 * set receive state machine into initial state
1966 iscsi_tcp_hdr_recv_prep(tcp_conn);
1974 /* called with host lock */
1976 iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
1978 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
1979 tcp_mtask->xmstate = XMSTATE_IMM_HDR_INIT;
1983 iscsi_r2tpool_alloc(struct iscsi_session *session)
1989 * initialize per-task: R2T pool and xmit queue
1991 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1992 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1993 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1996 * pre-allocated x4 as much r2ts to handle race when
1997 * target acks DataOut faster than we data_xmit() queues
1998 * could replenish r2tqueue.
2002 if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
2003 (void***)&tcp_ctask->r2ts,
2004 sizeof(struct iscsi_r2t_info))) {
2005 goto r2t_alloc_fail;
2008 /* R2T xmit queue */
2009 tcp_ctask->r2tqueue = kfifo_alloc(
2010 session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
2011 if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
2012 iscsi_pool_free(&tcp_ctask->r2tpool,
2013 (void**)tcp_ctask->r2ts);
2014 goto r2t_alloc_fail;
2021 for (i = 0; i < cmd_i; i++) {
2022 struct iscsi_cmd_task *ctask = session->cmds[i];
2023 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2025 kfifo_free(tcp_ctask->r2tqueue);
2026 iscsi_pool_free(&tcp_ctask->r2tpool,
2027 (void**)tcp_ctask->r2ts);
2033 iscsi_r2tpool_free(struct iscsi_session *session)
2037 for (i = 0; i < session->cmds_max; i++) {
2038 struct iscsi_cmd_task *ctask = session->cmds[i];
2039 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2041 kfifo_free(tcp_ctask->r2tqueue);
2042 iscsi_pool_free(&tcp_ctask->r2tpool,
2043 (void**)tcp_ctask->r2ts);
2048 iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
2049 char *buf, int buflen)
2051 struct iscsi_conn *conn = cls_conn->dd_data;
2052 struct iscsi_session *session = conn->session;
2053 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2057 case ISCSI_PARAM_HDRDGST_EN:
2058 iscsi_set_param(cls_conn, param, buf, buflen);
2060 case ISCSI_PARAM_DATADGST_EN:
2061 iscsi_set_param(cls_conn, param, buf, buflen);
2062 tcp_conn->sendpage = conn->datadgst_en ?
2063 sock_no_sendpage : tcp_conn->sock->ops->sendpage;
2065 case ISCSI_PARAM_MAX_R2T:
2066 sscanf(buf, "%d", &value);
2067 if (session->max_r2t == roundup_pow_of_two(value))
2069 iscsi_r2tpool_free(session);
2070 iscsi_set_param(cls_conn, param, buf, buflen);
2071 if (session->max_r2t & (session->max_r2t - 1))
2072 session->max_r2t = roundup_pow_of_two(session->max_r2t);
2073 if (iscsi_r2tpool_alloc(session))
2077 return iscsi_set_param(cls_conn, param, buf, buflen);
2084 iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
2085 enum iscsi_param param, char *buf)
2087 struct iscsi_conn *conn = cls_conn->dd_data;
2091 case ISCSI_PARAM_CONN_PORT:
2092 spin_lock_bh(&conn->session->lock);
2093 len = sprintf(buf, "%hu\n", conn->portal_port);
2094 spin_unlock_bh(&conn->session->lock);
2096 case ISCSI_PARAM_CONN_ADDRESS:
2097 spin_lock_bh(&conn->session->lock);
2098 len = sprintf(buf, "%s\n", conn->portal_address);
2099 spin_unlock_bh(&conn->session->lock);
2102 return iscsi_conn_get_param(cls_conn, param, buf);
2109 iscsi_tcp_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2112 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2116 case ISCSI_HOST_PARAM_IPADDRESS:
2117 spin_lock_bh(&session->lock);
2118 if (!session->leadconn)
2121 len = sprintf(buf, "%s\n",
2122 session->leadconn->local_address);
2123 spin_unlock_bh(&session->lock);
2126 return iscsi_host_get_param(shost, param, buf);
2132 iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
2134 struct iscsi_conn *conn = cls_conn->dd_data;
2135 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2137 stats->txdata_octets = conn->txdata_octets;
2138 stats->rxdata_octets = conn->rxdata_octets;
2139 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2140 stats->dataout_pdus = conn->dataout_pdus_cnt;
2141 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2142 stats->datain_pdus = conn->datain_pdus_cnt;
2143 stats->r2t_pdus = conn->r2t_pdus_cnt;
2144 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2145 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2146 stats->custom_length = 3;
2147 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
2148 stats->custom[0].value = tcp_conn->sendpage_failures_cnt;
2149 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
2150 stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt;
2151 strcpy(stats->custom[2].desc, "eh_abort_cnt");
2152 stats->custom[2].value = conn->eh_abort_cnt;
2155 static struct iscsi_cls_session *
2156 iscsi_tcp_session_create(struct iscsi_transport *iscsit,
2157 struct scsi_transport_template *scsit,
2158 uint16_t cmds_max, uint16_t qdepth,
2159 uint32_t initial_cmdsn, uint32_t *hostno)
2161 struct iscsi_cls_session *cls_session;
2162 struct iscsi_session *session;
2166 cls_session = iscsi_session_setup(iscsit, scsit, cmds_max, qdepth,
2167 sizeof(struct iscsi_tcp_cmd_task),
2168 sizeof(struct iscsi_tcp_mgmt_task),
2169 initial_cmdsn, &hn);
2174 session = class_to_transport_session(cls_session);
2175 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2176 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
2177 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2179 ctask->hdr = &tcp_ctask->hdr;
2182 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
2183 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
2184 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
2186 mtask->hdr = &tcp_mtask->hdr;
2189 if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
2190 goto r2tpool_alloc_fail;
2195 iscsi_session_teardown(cls_session);
2199 static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
2201 iscsi_r2tpool_free(class_to_transport_session(cls_session));
2202 iscsi_session_teardown(cls_session);
2205 static int iscsi_tcp_slave_configure(struct scsi_device *sdev)
2207 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
2208 blk_queue_dma_alignment(sdev->request_queue, 0);
2212 static struct scsi_host_template iscsi_sht = {
2213 .module = THIS_MODULE,
2214 .name = "iSCSI Initiator over TCP/IP",
2215 .queuecommand = iscsi_queuecommand,
2216 .change_queue_depth = iscsi_change_queue_depth,
2217 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
2218 .sg_tablesize = ISCSI_SG_TABLESIZE,
2219 .max_sectors = 0xFFFF,
2220 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
2221 .eh_abort_handler = iscsi_eh_abort,
2222 .eh_device_reset_handler= iscsi_eh_device_reset,
2223 .eh_host_reset_handler = iscsi_eh_host_reset,
2224 .use_clustering = DISABLE_CLUSTERING,
2225 .slave_configure = iscsi_tcp_slave_configure,
2226 .proc_name = "iscsi_tcp",
2230 static struct iscsi_transport iscsi_tcp_transport = {
2231 .owner = THIS_MODULE,
2233 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
2235 .param_mask = ISCSI_MAX_RECV_DLENGTH |
2236 ISCSI_MAX_XMIT_DLENGTH |
2239 ISCSI_INITIAL_R2T_EN |
2244 ISCSI_PDU_INORDER_EN |
2245 ISCSI_DATASEQ_INORDER_EN |
2248 ISCSI_CONN_ADDRESS |
2250 ISCSI_PERSISTENT_PORT |
2251 ISCSI_PERSISTENT_ADDRESS |
2252 ISCSI_TARGET_NAME | ISCSI_TPGT |
2253 ISCSI_USERNAME | ISCSI_PASSWORD |
2254 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
2256 .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
2257 ISCSI_HOST_INITIATOR_NAME |
2258 ISCSI_HOST_NETDEV_NAME,
2259 .host_template = &iscsi_sht,
2260 .conndata_size = sizeof(struct iscsi_conn),
2262 .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
2263 /* session management */
2264 .create_session = iscsi_tcp_session_create,
2265 .destroy_session = iscsi_tcp_session_destroy,
2266 /* connection management */
2267 .create_conn = iscsi_tcp_conn_create,
2268 .bind_conn = iscsi_tcp_conn_bind,
2269 .destroy_conn = iscsi_tcp_conn_destroy,
2270 .set_param = iscsi_conn_set_param,
2271 .get_conn_param = iscsi_tcp_conn_get_param,
2272 .get_session_param = iscsi_session_get_param,
2273 .start_conn = iscsi_conn_start,
2274 .stop_conn = iscsi_tcp_conn_stop,
2275 /* iscsi host params */
2276 .get_host_param = iscsi_tcp_host_get_param,
2277 .set_host_param = iscsi_host_set_param,
2279 .send_pdu = iscsi_conn_send_pdu,
2280 .get_stats = iscsi_conn_get_stats,
2281 .init_cmd_task = iscsi_tcp_cmd_init,
2282 .init_mgmt_task = iscsi_tcp_mgmt_init,
2283 .xmit_cmd_task = iscsi_tcp_ctask_xmit,
2284 .xmit_mgmt_task = iscsi_tcp_mtask_xmit,
2285 .cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
2287 .session_recovery_timedout = iscsi_session_recovery_timedout,
2291 iscsi_tcp_init(void)
2293 if (iscsi_max_lun < 1) {
2294 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
2298 iscsi_tcp_transport.max_lun = iscsi_max_lun;
2300 if (!iscsi_register_transport(&iscsi_tcp_transport))
2307 iscsi_tcp_exit(void)
2309 iscsi_unregister_transport(&iscsi_tcp_transport);
2312 module_init(iscsi_tcp_init);
2313 module_exit(iscsi_tcp_exit);