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[SCSI] iscsi class, qla4xxx, iscsi_tcp: export local address
[linux-2.6-block.git] / drivers / scsi / iscsi_tcp.c
CommitLineData
7ba24713
AA		 1/*
2 * iSCSI Initiator over TCP/IP Data-Path
3 *
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
5bb0b55a
MC		 6 * Copyright (C) 2005 - 2006 Mike Christie
7 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
7ba24713
AA		 8 * maintained by open-iscsi@googlegroups.com
9 *
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.
14 *
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.
19 *
20 * See the file COPYING included with this distribution for more details.
21 *
22 * Credits:
23 * Christoph Hellwig
24 * FUJITA Tomonori
25 * Arne Redlich
26 * Zhenyu Wang
27 */
28
29#include <linux/types.h>
30#include <linux/list.h>
31#include <linux/inet.h>
4e7aba73 32#include <linux/file.h>
7ba24713
AA		 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>
38#include <net/tcp.h>
39#include <scsi/scsi_cmnd.h>
d1d81c01 40#include <scsi/scsi_device.h>
7ba24713
AA		 41#include <scsi/scsi_host.h>
42#include <scsi/scsi.h>
43#include <scsi/scsi_transport_iscsi.h>
44
45#include "iscsi_tcp.h"
46
47MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
48 "Alex Aizman <itn780@yahoo.com>");
49MODULE_DESCRIPTION("iSCSI/TCP data-path");
50MODULE_LICENSE("GPL");
7ba24713 51/* #define DEBUG_TCP */
7ba24713
AA		 52#define DEBUG_ASSERT
53
54#ifdef DEBUG_TCP
5bb0b55a 55#define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)
7ba24713
AA		 56#else
57#define debug_tcp(fmt...)
58#endif
59
7ba24713
AA		 60#ifndef DEBUG_ASSERT
61#ifdef BUG_ON
62#undef BUG_ON
63#endif
64#define BUG_ON(expr)
65#endif
66
7ba24713
AA		 67static unsigned int iscsi_max_lun = 512;
68module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
69
7ba24713
AA		 70static inline void
71iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
72{
7cae5159
MC		 73 ibuf->sg.page = virt_to_page(vbuf);
74 ibuf->sg.offset = offset_in_page(vbuf);
7ba24713
AA		 75 ibuf->sg.length = size;
76 ibuf->sent = 0;
7cae5159 77 ibuf->use_sendmsg = 1;
7ba24713
AA		 78}
79
80static inline void
81iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
82{
7cae5159
MC		 83 ibuf->sg.page = sg->page;
84 ibuf->sg.offset = sg->offset;
85 ibuf->sg.length = sg->length;
7ba24713
AA		 86 /*
87 * Fastpath: sg element fits into single page
88 */
a1e80c20 89 if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page))
7cae5159
MC		 90 ibuf->use_sendmsg = 0;
91 else
92 ibuf->use_sendmsg = 1;
7ba24713
AA		 93 ibuf->sent = 0;
94}
95
96static inline int
97iscsi_buf_left(struct iscsi_buf *ibuf)
98{
99 int rc;
100
101 rc = ibuf->sg.length - ibuf->sent;
102 BUG_ON(rc < 0);
103 return rc;
104}
105
106static inline void
af973481
MC		 107iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
108 u8* crc)
7ba24713 109{
5bb0b55a 110 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
7ba24713 111
c9802cd9 112 crypto_hash_digest(&tcp_conn->tx_hash, &buf->sg, buf->sg.length, crc);
218432c6 113 buf->sg.length += sizeof(u32);
7ba24713
AA		 114}
115
116static inline int
5bb0b55a 117iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn)
7ba24713 118{
5bb0b55a 119 struct sk_buff *skb = tcp_conn->in.skb;
7ba24713 120
5bb0b55a 121 tcp_conn->in.zero_copy_hdr = 0;
7ba24713 122
5bb0b55a
MC		 123 if (tcp_conn->in.copy >= tcp_conn->hdr_size &&
124 tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
7ba24713
AA		 125 /*
126 * Zero-copy PDU Header: using connection context
127 * to store header pointer.
128 */
129 if (skb_shinfo(skb)->frag_list == NULL &&
5bb0b55a
MC		 130 !skb_shinfo(skb)->nr_frags) {
131 tcp_conn->in.hdr = (struct iscsi_hdr *)
132 ((char*)skb->data + tcp_conn->in.offset);
133 tcp_conn->in.zero_copy_hdr = 1;
134 } else {
7ba24713
AA		 135 /* ignoring return code since we checked
136 * in.copy before */
5bb0b55a
MC		 137 skb_copy_bits(skb, tcp_conn->in.offset,
138 &tcp_conn->hdr, tcp_conn->hdr_size);
139 tcp_conn->in.hdr = &tcp_conn->hdr;
7ba24713 140 }
5bb0b55a
MC		 141 tcp_conn->in.offset += tcp_conn->hdr_size;
142 tcp_conn->in.copy -= tcp_conn->hdr_size;
7ba24713
AA		 143 } else {
144 int hdr_remains;
145 int copylen;
146
147 /*
148 * PDU header scattered across SKB's,
149 * copying it... This'll happen quite rarely.
150 */
151
5bb0b55a
MC		 152 if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER)
153 tcp_conn->in.hdr_offset = 0;
7ba24713 154
5bb0b55a 155 hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset;
7ba24713
AA		 156 BUG_ON(hdr_remains <= 0);
157
5bb0b55a
MC		 158 copylen = min(tcp_conn->in.copy, hdr_remains);
159 skb_copy_bits(skb, tcp_conn->in.offset,
160 (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset,
161 copylen);
7ba24713
AA		 162
163 debug_tcp("PDU gather offset %d bytes %d in.offset %d "
5bb0b55a
MC		 164 "in.copy %d\n", tcp_conn->in.hdr_offset, copylen,
165 tcp_conn->in.offset, tcp_conn->in.copy);
7ba24713 166
5bb0b55a
MC		 167 tcp_conn->in.offset += copylen;
168 tcp_conn->in.copy -= copylen;
7ba24713 169 if (copylen < hdr_remains) {
5bb0b55a
MC		 170 tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER;
171 tcp_conn->in.hdr_offset += copylen;
7ba24713
AA		 172 return -EAGAIN;
173 }
5bb0b55a
MC		 174 tcp_conn->in.hdr = &tcp_conn->hdr;
175 tcp_conn->discontiguous_hdr_cnt++;
176 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
7ba24713
AA		 177 }
178
179 return 0;
180}
181
30a6c652
MC		 182/*
183 * must be called with session lock
184 */
185static void
b6c395ed 186iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
7ba24713 187{
5bb0b55a 188 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
b6c395ed 189 struct iscsi_r2t_info *r2t;
30a6c652 190 struct scsi_cmnd *sc;
7ba24713 191
b6c395ed
MC		 192 /* flush ctask's r2t queues */
193 while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
194 __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
195 sizeof(void*));
196 debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n");
197 }
198
30a6c652
MC		 199 sc = ctask->sc;
200 if (unlikely(!sc))
7ba24713 201 return;
30a6c652 202
5bb0b55a
MC		 203 tcp_ctask->xmstate = XMSTATE_IDLE;
204 tcp_ctask->r2t = NULL;
7ba24713
AA		 205}
206
207/**
208 * iscsi_data_rsp - SCSI Data-In Response processing
209 * @conn: iscsi connection
210 * @ctask: scsi command task
211 **/
212static int
213iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
214{
5bb0b55a
MC		 215 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
216 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
217 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
7ba24713 218 struct iscsi_session *session = conn->session;
857ae0bd 219 struct scsi_cmnd *sc = ctask->sc;
7ba24713
AA		 220 int datasn = be32_to_cpu(rhdr->datasn);
221
77a23c21 222 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
7ba24713
AA		 223 /*
224 * setup Data-In byte counter (gets decremented..)
225 */
5bb0b55a 226 ctask->data_count = tcp_conn->in.datalen;
7ba24713 227
5bb0b55a 228 if (tcp_conn->in.datalen == 0)
7ba24713
AA		 229 return 0;
230
d473cc7f
MC		 231 if (tcp_ctask->exp_datasn != datasn) {
232 debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->datasn(%d)\n",
233 __FUNCTION__, tcp_ctask->exp_datasn, datasn);
7ba24713 234 return ISCSI_ERR_DATASN;
d473cc7f 235 }
7ba24713 236
d473cc7f 237 tcp_ctask->exp_datasn++;
7ba24713 238
5bb0b55a 239 tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
857ae0bd
MC		 240 if (tcp_ctask->data_offset + tcp_conn->in.datalen > sc->request_bufflen) {
241 debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",
242 __FUNCTION__, tcp_ctask->data_offset,
243 tcp_conn->in.datalen, sc->request_bufflen);
7ba24713 244 return ISCSI_ERR_DATA_OFFSET;
857ae0bd 245 }
7ba24713
AA		 246
247 if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
7ba24713 248 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
bf310b8f 249 if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) {
7ba24713
AA		 250 int res_count = be32_to_cpu(rhdr->residual_count);
251
252 if (res_count > 0 &&
253 res_count <= sc->request_bufflen) {
254 sc->resid = res_count;
255 sc->result = (DID_OK << 16) | rhdr->cmd_status;
256 } else
257 sc->result = (DID_BAD_TARGET << 16) |
258 rhdr->cmd_status;
bf310b8f 259 } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) {
7ba24713
AA		 260 sc->resid = be32_to_cpu(rhdr->residual_count);
261 sc->result = (DID_OK << 16) | rhdr->cmd_status;
262 } else
263 sc->result = (DID_OK << 16) | rhdr->cmd_status;
264 }
265
266 conn->datain_pdus_cnt++;
267 return 0;
268}
269
270/**
271 * iscsi_solicit_data_init - initialize first Data-Out
272 * @conn: iscsi connection
273 * @ctask: scsi command task
274 * @r2t: R2T info
275 *
276 * Notes:
277 * Initialize first Data-Out within this R2T sequence and finds
278 * proper data_offset within this SCSI command.
279 *
280 * This function is called with connection lock taken.
281 **/
282static void
283iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
284 struct iscsi_r2t_info *r2t)
285{
286 struct iscsi_data *hdr;
7ba24713
AA		 287 struct scsi_cmnd *sc = ctask->sc;
288
ffbfe925 289 hdr = &r2t->dtask.hdr;
7ba24713
AA		 290 memset(hdr, 0, sizeof(struct iscsi_data));
291 hdr->ttt = r2t->ttt;
292 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
293 r2t->solicit_datasn++;
294 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
5bb0b55a
MC		 295 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
296 hdr->itt = ctask->hdr->itt;
7ba24713
AA		 297 hdr->exp_statsn = r2t->exp_statsn;
298 hdr->offset = cpu_to_be32(r2t->data_offset);
299 if (r2t->data_length > conn->max_xmit_dlength) {
300 hton24(hdr->dlength, conn->max_xmit_dlength);
301 r2t->data_count = conn->max_xmit_dlength;
302 hdr->flags = 0;
303 } else {
304 hton24(hdr->dlength, r2t->data_length);
305 r2t->data_count = r2t->data_length;
306 hdr->flags = ISCSI_FLAG_CMD_FINAL;
307 }
308 conn->dataout_pdus_cnt++;
309
310 r2t->sent = 0;
311
6e458cc9 312 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
af973481 313 sizeof(struct iscsi_hdr));
7ba24713 314
7ba24713
AA		 315 if (sc->use_sg) {
316 int i, sg_count = 0;
317 struct scatterlist *sg = sc->request_buffer;
318
319 r2t->sg = NULL;
320 for (i = 0; i < sc->use_sg; i++, sg += 1) {
321 /* FIXME: prefetch ? */
322 if (sg_count + sg->length > r2t->data_offset) {
323 int page_offset;
324
325 /* sg page found! */
326
327 /* offset within this page */
328 page_offset = r2t->data_offset - sg_count;
329
330 /* fill in this buffer */
331 iscsi_buf_init_sg(&r2t->sendbuf, sg);
332 r2t->sendbuf.sg.offset += page_offset;
333 r2t->sendbuf.sg.length -= page_offset;
334
335 /* xmit logic will continue with next one */
336 r2t->sg = sg + 1;
337 break;
338 }
339 sg_count += sg->length;
340 }
341 BUG_ON(r2t->sg == NULL);
62f38300
MC		 342 } else {
343 iscsi_buf_init_iov(&r2t->sendbuf,
7ba24713
AA		 344 (char*)sc->request_buffer + r2t->data_offset,
345 r2t->data_count);
62f38300
MC		 346 r2t->sg = NULL;
347 }
7ba24713
AA		 348}
349
350/**
351 * iscsi_r2t_rsp - iSCSI R2T Response processing
352 * @conn: iscsi connection
353 * @ctask: scsi command task
354 **/
355static int
356iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
357{
358 struct iscsi_r2t_info *r2t;
359 struct iscsi_session *session = conn->session;
5bb0b55a
MC		 360 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
361 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
362 struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
7ba24713
AA		 363 int r2tsn = be32_to_cpu(rhdr->r2tsn);
364 int rc;
365
98a9416a
MC		 366 if (tcp_conn->in.datalen) {
367 printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n",
368 tcp_conn->in.datalen);
7ba24713 369 return ISCSI_ERR_DATALEN;
98a9416a 370 }
7ba24713 371
d473cc7f
MC		 372 if (tcp_ctask->exp_datasn != r2tsn){
373 debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
374 __FUNCTION__, tcp_ctask->exp_datasn, r2tsn);
7ba24713 375 return ISCSI_ERR_R2TSN;
d473cc7f 376 }
7ba24713 377
7ba24713
AA		 378 /* fill-in new R2T associated with the task */
379 spin_lock(&session->lock);
77a23c21
MC		 380 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
381
7ba24713
AA		 382 if (!ctask->sc || ctask->mtask ||
383 session->state != ISCSI_STATE_LOGGED_IN) {
384 printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
385 "recovery...\n", ctask->itt);
386 spin_unlock(&session->lock);
387 return 0;
388 }
b6c395ed 389
5bb0b55a 390 rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
7ba24713
AA		 391 BUG_ON(!rc);
392
393 r2t->exp_statsn = rhdr->statsn;
394 r2t->data_length = be32_to_cpu(rhdr->data_length);
98a9416a
MC		 395 if (r2t->data_length == 0) {
396 printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n");
7ba24713
AA		 397 spin_unlock(&session->lock);
398 return ISCSI_ERR_DATALEN;
399 }
400
98a9416a
MC		 401 if (r2t->data_length > session->max_burst)
402 debug_scsi("invalid R2T with data len %u and max burst %u."
403 "Attempting to execute request.\n",
404 r2t->data_length, session->max_burst);
405
7ba24713 406 r2t->data_offset = be32_to_cpu(rhdr->data_offset);
857ae0bd 407 if (r2t->data_offset + r2t->data_length > ctask->sc->request_bufflen) {
7ba24713 408 spin_unlock(&session->lock);
98a9416a
MC		 409 printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at "
410 "offset %u and total length %d\n", r2t->data_length,
857ae0bd 411 r2t->data_offset, ctask->sc->request_bufflen);
7ba24713
AA		 412 return ISCSI_ERR_DATALEN;
413 }
414
415 r2t->ttt = rhdr->ttt; /* no flip */
416 r2t->solicit_datasn = 0;
417
418 iscsi_solicit_data_init(conn, ctask, r2t);
419
d473cc7f 420 tcp_ctask->exp_datasn = r2tsn + 1;
5bb0b55a 421 __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
218432c6 422 tcp_ctask->xmstate |= XMSTATE_SOL_HDR_INIT;
b6c395ed 423 list_move_tail(&ctask->running, &conn->xmitqueue);
7ba24713 424
55e3299d 425 scsi_queue_work(session->host, &conn->xmitwork);
7ba24713
AA		 426 conn->r2t_pdus_cnt++;
427 spin_unlock(&session->lock);
428
429 return 0;
430}
431
432static int
5bb0b55a 433iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
7ba24713 434{
5bb0b55a 435 int rc = 0, opcode, ahslen;
7ba24713 436 struct iscsi_hdr *hdr;
7ba24713 437 struct iscsi_session *session = conn->session;
5bb0b55a
MC		 438 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
439 uint32_t cdgst, rdgst = 0, itt;
7ba24713 440
5bb0b55a 441 hdr = tcp_conn->in.hdr;
7ba24713
AA		 442
443 /* verify PDU length */
5bb0b55a
MC		 444 tcp_conn->in.datalen = ntoh24(hdr->dlength);
445 if (tcp_conn->in.datalen > conn->max_recv_dlength) {
7ba24713 446 printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
5bb0b55a 447 tcp_conn->in.datalen, conn->max_recv_dlength);
7ba24713
AA		 448 return ISCSI_ERR_DATALEN;
449 }
5bb0b55a 450 tcp_conn->data_copied = 0;
7ba24713
AA		 451
452 /* read AHS */
5bb0b55a
MC		 453 ahslen = hdr->hlength << 2;
454 tcp_conn->in.offset += ahslen;
455 tcp_conn->in.copy -= ahslen;
456 if (tcp_conn->in.copy < 0) {
7ba24713 457 printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
5bb0b55a 458 "%d bytes\n", ahslen);
7ba24713
AA		 459 return ISCSI_ERR_AHSLEN;
460 }
461
462 /* calculate read padding */
5bb0b55a
MC		 463 tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1);
464 if (tcp_conn->in.padding) {
465 tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding;
466 debug_scsi("read padding %d bytes\n", tcp_conn->in.padding);
7ba24713
AA		 467 }
468
469 if (conn->hdrdgst_en) {
470 struct scatterlist sg;
471
472 sg_init_one(&sg, (u8 *)hdr,
5bb0b55a 473 sizeof(struct iscsi_hdr) + ahslen);
c9802cd9
JB		 474 crypto_hash_digest(&tcp_conn->rx_hash, &sg, sg.length,
475 (u8 *)&cdgst);
7ba24713 476 rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
5bb0b55a 477 ahslen);
8a47cd34 478 if (cdgst != rdgst) {
5bb0b55a
MC		 479 printk(KERN_ERR "iscsi_tcp: hdrdgst error "
480 "recv 0x%x calc 0x%x\n", rdgst, cdgst);
8a47cd34
MC		 481 return ISCSI_ERR_HDR_DGST;
482 }
7ba24713
AA		 483 }
484
5bb0b55a 485 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
7ba24713 486 /* verify itt (itt encoding: age+cid+itt) */
5bb0b55a
MC		 487 rc = iscsi_verify_itt(conn, hdr, &itt);
488 if (rc == ISCSI_ERR_NO_SCSI_CMD) {
489 tcp_conn->in.datalen = 0; /* force drop */
490 return 0;
491 } else if (rc)
492 return rc;
7ba24713
AA		 493
494 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
5bb0b55a
MC		 495 opcode, tcp_conn->in.offset, tcp_conn->in.copy,
496 ahslen, tcp_conn->in.datalen);
7ba24713 497
5bb0b55a
MC		 498 switch(opcode) {
499 case ISCSI_OP_SCSI_DATA_IN:
500 tcp_conn->in.ctask = session->cmds[itt];
501 rc = iscsi_data_rsp(conn, tcp_conn->in.ctask);
275fd7d1
MC		 502 if (rc)
503 return rc;
5bb0b55a
MC		 504 /* fall through */
505 case ISCSI_OP_SCSI_CMD_RSP:
506 tcp_conn->in.ctask = session->cmds[itt];
507 if (tcp_conn->in.datalen)
508 goto copy_hdr;
7ba24713 509
5bb0b55a 510 spin_lock(&session->lock);
5bb0b55a
MC		 511 rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
512 spin_unlock(&session->lock);
513 break;
514 case ISCSI_OP_R2T:
515 tcp_conn->in.ctask = session->cmds[itt];
516 if (ahslen)
517 rc = ISCSI_ERR_AHSLEN;
518 else if (tcp_conn->in.ctask->sc->sc_data_direction ==
519 DMA_TO_DEVICE)
520 rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask);
521 else
522 rc = ISCSI_ERR_PROTO;
523 break;
524 case ISCSI_OP_LOGIN_RSP:
525 case ISCSI_OP_TEXT_RSP:
5bb0b55a
MC		 526 case ISCSI_OP_REJECT:
527 case ISCSI_OP_ASYNC_EVENT:
c8dc1e52
MC		 528 /*
529 * It is possible that we could get a PDU with a buffer larger
530 * than 8K, but there are no targets that currently do this.
531 * For now we fail until we find a vendor that needs it
532 */
bf32ed33 533 if (ISCSI_DEF_MAX_RECV_SEG_LEN <
c8dc1e52
MC		 534 tcp_conn->in.datalen) {
535 printk(KERN_ERR "iscsi_tcp: received buffer of len %u "
536 "but conn buffer is only %u (opcode %0x)\n",
537 tcp_conn->in.datalen,
bf32ed33 538 ISCSI_DEF_MAX_RECV_SEG_LEN, opcode);
c8dc1e52
MC		 539 rc = ISCSI_ERR_PROTO;
540 break;
541 }
542
5bb0b55a
MC		 543 if (tcp_conn->in.datalen)
544 goto copy_hdr;
545 /* fall through */
c8dc1e52
MC		 546 case ISCSI_OP_LOGOUT_RSP:
547 case ISCSI_OP_NOOP_IN:
5bb0b55a
MC		 548 case ISCSI_OP_SCSI_TMFUNC_RSP:
549 rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
550 break;
551 default:
552 rc = ISCSI_ERR_BAD_OPCODE;
553 break;
554 }
7ba24713
AA		 555
556 return rc;
5bb0b55a
MC		 557
558copy_hdr:
559 /*
560 * if we did zero copy for the header but we will need multiple
561 * skbs to complete the command then we have to copy the header
562 * for later use
563 */
275fd7d1 564 if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <=
5bb0b55a
MC		 565 (tcp_conn->in.datalen + tcp_conn->in.padding +
566 (conn->datadgst_en ? 4 : 0))) {
567 debug_tcp("Copying header for later use. in.copy %d in.datalen"
568 " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen);
569 memcpy(&tcp_conn->hdr, tcp_conn->in.hdr,
570 sizeof(struct iscsi_hdr));
571 tcp_conn->in.hdr = &tcp_conn->hdr;
572 tcp_conn->in.zero_copy_hdr = 0;
573 }
574 return 0;
7ba24713
AA		 575}
576
577/**
578 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
5bb0b55a 579 * @conn: iscsi tcp connection
7ba24713
AA		 580 * @ctask: scsi command task
581 * @buf: buffer to copy to
582 * @buf_size: size of buffer
583 * @offset: offset within the buffer
584 *
585 * Notes:
586 * The function calls skb_copy_bits() and updates per-connection and
587 * per-cmd byte counters.
588 *
589 * Read counters (in bytes):
590 *
591 * conn->in.offset offset within in progress SKB
592 * conn->in.copy left to copy from in progress SKB
593 * including padding
594 * conn->in.copied copied already from in progress SKB
595 * conn->data_copied copied already from in progress buffer
596 * ctask->sent total bytes sent up to the MidLayer
597 * ctask->data_count left to copy from in progress Data-In
598 * buf_left left to copy from in progress buffer
599 **/
600static inline int
5bb0b55a 601iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
7ba24713
AA		 602 void *buf, int buf_size, int offset)
603{
5bb0b55a
MC		 604 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
605 int buf_left = buf_size - (tcp_conn->data_copied + offset);
857ae0bd 606 unsigned size = min(tcp_conn->in.copy, buf_left);
7ba24713
AA		 607 int rc;
608
609 size = min(size, ctask->data_count);
610
611 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
5bb0b55a 612 size, tcp_conn->in.offset, tcp_conn->in.copied);
7ba24713
AA		 613
614 BUG_ON(size <= 0);
857ae0bd 615 BUG_ON(tcp_ctask->sent + size > ctask->sc->request_bufflen);
7ba24713 616
5bb0b55a
MC		 617 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
618 (char*)buf + (offset + tcp_conn->data_copied), size);
7ba24713
AA		 619 /* must fit into skb->len */
620 BUG_ON(rc);
621
5bb0b55a
MC		 622 tcp_conn->in.offset += size;
623 tcp_conn->in.copy -= size;
624 tcp_conn->in.copied += size;
625 tcp_conn->data_copied += size;
626 tcp_ctask->sent += size;
7ba24713
AA		 627 ctask->data_count -= size;
628
5bb0b55a 629 BUG_ON(tcp_conn->in.copy < 0);
7ba24713
AA		 630 BUG_ON(ctask->data_count < 0);
631
5bb0b55a 632 if (buf_size != (tcp_conn->data_copied + offset)) {
7ba24713 633 if (!ctask->data_count) {
5bb0b55a 634 BUG_ON(buf_size - tcp_conn->data_copied < 0);
7ba24713 635 /* done with this PDU */
5bb0b55a 636 return buf_size - tcp_conn->data_copied;
7ba24713
AA		 637 }
638 return -EAGAIN;
639 }
640
641 /* done with this buffer or with both - PDU and buffer */
5bb0b55a 642 tcp_conn->data_copied = 0;
7ba24713
AA		 643 return 0;
644}
645
646/**
647 * iscsi_tcp_copy - copy skb bits to the destanation buffer
5bb0b55a 648 * @conn: iscsi tcp connection
7ba24713
AA		 649 *
650 * Notes:
651 * The function calls skb_copy_bits() and updates per-connection
652 * byte counters.
653 **/
654static inline int
ca518684 655iscsi_tcp_copy(struct iscsi_conn *conn, int buf_size)
7ba24713 656{
c8dc1e52 657 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
5bb0b55a
MC		 658 int buf_left = buf_size - tcp_conn->data_copied;
659 int size = min(tcp_conn->in.copy, buf_left);
7ba24713
AA		 660 int rc;
661
662 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
5bb0b55a 663 size, tcp_conn->in.offset, tcp_conn->data_copied);
7ba24713
AA		 664 BUG_ON(size <= 0);
665
5bb0b55a 666 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
c8dc1e52 667 (char*)conn->data + tcp_conn->data_copied, size);
7ba24713
AA		 668 BUG_ON(rc);
669
5bb0b55a
MC		 670 tcp_conn->in.offset += size;
671 tcp_conn->in.copy -= size;
672 tcp_conn->in.copied += size;
673 tcp_conn->data_copied += size;
7ba24713 674
5bb0b55a 675 if (buf_size != tcp_conn->data_copied)
7ba24713
AA		 676 return -EAGAIN;
677
678 return 0;
679}
680
681static inline void
c9802cd9 682partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg,
62f38300 683 int offset, int length)
7ba24713
AA		 684{
685 struct scatterlist temp;
686
687 memcpy(&temp, sg, sizeof(struct scatterlist));
688 temp.offset = offset;
689 temp.length = length;
c9802cd9 690 crypto_hash_update(desc, &temp, length);
7ba24713
AA		 691}
692
f6cfba1d 693static void
5bb0b55a 694iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len)
f6cfba1d
MC		 695{
696 struct scatterlist tmp;
697
698 sg_init_one(&tmp, buf, len);
c9802cd9 699 crypto_hash_update(&tcp_conn->rx_hash, &tmp, len);
f6cfba1d
MC		 700}
701
7ba24713
AA		 702static int iscsi_scsi_data_in(struct iscsi_conn *conn)
703{
5bb0b55a
MC		 704 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
705 struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
706 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
7ba24713 707 struct scsi_cmnd *sc = ctask->sc;
f6cfba1d 708 struct scatterlist *sg;
7ba24713
AA		 709 int i, offset, rc = 0;
710
711 BUG_ON((void*)ctask != sc->SCp.ptr);
712
713 /*
714 * copying Data-In into the Scsi_Cmnd
715 */
716 if (!sc->use_sg) {
717 i = ctask->data_count;
5bb0b55a
MC		 718 rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer,
719 sc->request_bufflen,
720 tcp_ctask->data_offset);
7ba24713
AA		 721 if (rc == -EAGAIN)
722 return rc;
42f72aa9 723 if (conn->datadgst_en)
5bb0b55a
MC		 724 iscsi_recv_digest_update(tcp_conn, sc->request_buffer,
725 i);
7ba24713
AA		 726 rc = 0;
727 goto done;
728 }
729
5bb0b55a 730 offset = tcp_ctask->data_offset;
7ba24713
AA		 731 sg = sc->request_buffer;
732
5bb0b55a
MC		 733 if (tcp_ctask->data_offset)
734 for (i = 0; i < tcp_ctask->sg_count; i++)
7ba24713
AA		 735 offset -= sg[i].length;
736 /* we've passed through partial sg*/
737 if (offset < 0)
738 offset = 0;
739
5bb0b55a 740 for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
7ba24713
AA		 741 char *dest;
742
743 dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
5bb0b55a 744 rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset,
7ba24713
AA		 745 sg[i].length, offset);
746 kunmap_atomic(dest, KM_SOFTIRQ0);
747 if (rc == -EAGAIN)
748 /* continue with the next SKB/PDU */
749 return rc;
750 if (!rc) {
751 if (conn->datadgst_en) {
752 if (!offset)
dc64ddf4 753 crypto_hash_update(
c9802cd9 754 &tcp_conn->rx_hash,
c959e1c2 755 &sg[i], sg[i].length);
7ba24713 756 else
62f38300 757 partial_sg_digest_update(
c9802cd9 758 &tcp_conn->rx_hash,
5bb0b55a 759 &sg[i],
7ba24713
AA		 760 sg[i].offset + offset,
761 sg[i].length - offset);
762 }
763 offset = 0;
5bb0b55a 764 tcp_ctask->sg_count++;
7ba24713
AA		 765 }
766
767 if (!ctask->data_count) {
768 if (rc && conn->datadgst_en)
769 /*
770 * data-in is complete, but buffer not...
771 */
c9802cd9
JB		 772 partial_sg_digest_update(&tcp_conn->rx_hash,
773 &sg[i],
774 sg[i].offset,
775 sg[i].length-rc);
7ba24713
AA		 776 rc = 0;
777 break;
778 }
779
5bb0b55a 780 if (!tcp_conn->in.copy)
7ba24713
AA		 781 return -EAGAIN;
782 }
783 BUG_ON(ctask->data_count);
784
785done:
786 /* check for non-exceptional status */
5bb0b55a 787 if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) {
b6c395ed
MC		 788 debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
789 (long)sc, sc->result, ctask->itt,
790 tcp_conn->in.hdr->flags);
5bb0b55a 791 spin_lock(&conn->session->lock);
5bb0b55a
MC		 792 __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
793 spin_unlock(&conn->session->lock);
7ba24713
AA		 794 }
795
796 return rc;
797}
798
799static int
800iscsi_data_recv(struct iscsi_conn *conn)
801{
5bb0b55a
MC		 802 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
803 int rc = 0, opcode;
7ba24713 804
5bb0b55a
MC		 805 opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
806 switch (opcode) {
7ba24713
AA		 807 case ISCSI_OP_SCSI_DATA_IN:
808 rc = iscsi_scsi_data_in(conn);
809 break;
5bb0b55a 810 case ISCSI_OP_SCSI_CMD_RSP:
7ba24713
AA		 811 case ISCSI_OP_TEXT_RSP:
812 case ISCSI_OP_LOGIN_RSP:
5bb0b55a
MC		 813 case ISCSI_OP_ASYNC_EVENT:
814 case ISCSI_OP_REJECT:
7ba24713
AA		 815 /*
816 * Collect data segment to the connection's data
817 * placeholder
818 */
ca518684 819 if (iscsi_tcp_copy(conn, tcp_conn->in.datalen)) {
7ba24713
AA		 820 rc = -EAGAIN;
821 goto exit;
822 }
823
c8dc1e52 824 rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data,
5bb0b55a
MC		 825 tcp_conn->in.datalen);
826 if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP)
c8dc1e52 827 iscsi_recv_digest_update(tcp_conn, conn->data,
5bb0b55a
MC		 828 tcp_conn->in.datalen);
829 break;
7ba24713
AA		 830 default:
831 BUG_ON(1);
832 }
833exit:
834 return rc;
835}
836
837/**
838 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
839 * @rd_desc: read descriptor
840 * @skb: socket buffer
841 * @offset: offset in skb
842 * @len: skb->len - offset
843 **/
844static int
845iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
846 unsigned int offset, size_t len)
847{
848 int rc;
849 struct iscsi_conn *conn = rd_desc->arg.data;
5bb0b55a 850 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
7ba24713
AA		 851 int processed;
852 char pad[ISCSI_PAD_LEN];
853 struct scatterlist sg;
854
855 /*
856 * Save current SKB and its offset in the corresponding
857 * connection context.
858 */
5bb0b55a
MC		 859 tcp_conn->in.copy = skb->len - offset;
860 tcp_conn->in.offset = offset;
861 tcp_conn->in.skb = skb;
862 tcp_conn->in.len = tcp_conn->in.copy;
863 BUG_ON(tcp_conn->in.copy <= 0);
864 debug_tcp("in %d bytes\n", tcp_conn->in.copy);
7ba24713
AA		 865
866more:
5bb0b55a 867 tcp_conn->in.copied = 0;
7ba24713
AA		 868 rc = 0;
869
870 if (unlikely(conn->suspend_rx)) {
871 debug_tcp("conn %d Rx suspended!\n", conn->id);
872 return 0;
873 }
874
5bb0b55a
MC		 875 if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
876 tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
877 rc = iscsi_hdr_extract(tcp_conn);
7ba24713
AA		 878 if (rc) {
879 if (rc == -EAGAIN)
880 goto nomore;
881 else {
d82967c7 882 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7ba24713
AA		 883 return 0;
884 }
885 }
886
887 /*
888 * Verify and process incoming PDU header.
889 */
5bb0b55a
MC		 890 rc = iscsi_tcp_hdr_recv(conn);
891 if (!rc && tcp_conn->in.datalen) {
dd8c0d95 892 if (conn->datadgst_en)
c9802cd9 893 crypto_hash_init(&tcp_conn->rx_hash);
5bb0b55a 894 tcp_conn->in_progress = IN_PROGRESS_DATA_RECV;
7ba24713 895 } else if (rc) {
40527afe 896 iscsi_conn_failure(conn, rc);
7ba24713
AA		 897 return 0;
898 }
899 }
900
dbdb016d
MC		 901 if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV &&
902 tcp_conn->in.copy) {
f6cfba1d 903 uint32_t recv_digest;
5bb0b55a 904
7ba24713 905 debug_tcp("extra data_recv offset %d copy %d\n",
5bb0b55a 906 tcp_conn->in.offset, tcp_conn->in.copy);
dbdb016d
MC		 907
908 if (!tcp_conn->data_copied) {
909 if (tcp_conn->in.padding) {
910 debug_tcp("padding -> %d\n",
911 tcp_conn->in.padding);
912 memset(pad, 0, tcp_conn->in.padding);
913 sg_init_one(&sg, pad, tcp_conn->in.padding);
914 crypto_hash_update(&tcp_conn->rx_hash,
915 &sg, sg.length);
916 }
917 crypto_hash_final(&tcp_conn->rx_hash,
918 (u8 *) &tcp_conn->in.datadgst);
919 debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst);
920 }
921
ca518684
MC		 922 rc = iscsi_tcp_copy(conn, sizeof(uint32_t));
923 if (rc) {
924 if (rc == -EAGAIN)
925 goto again;
926 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
927 return 0;
928 }
929
930 memcpy(&recv_digest, conn->data, sizeof(uint32_t));
5bb0b55a 931 if (recv_digest != tcp_conn->in.datadgst) {
f6cfba1d
MC		 932 debug_tcp("iscsi_tcp: data digest error!"
933 "0x%x != 0x%x\n", recv_digest,
5bb0b55a 934 tcp_conn->in.datadgst);
f6cfba1d
MC		 935 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
936 return 0;
937 } else {
938 debug_tcp("iscsi_tcp: data digest match!"
939 "0x%x == 0x%x\n", recv_digest,
5bb0b55a
MC		 940 tcp_conn->in.datadgst);
941 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
7ba24713
AA		 942 }
943 }
944
5bb0b55a 945 if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV &&
dbdb016d 946 tcp_conn->in.copy) {
7ba24713 947 debug_tcp("data_recv offset %d copy %d\n",
5bb0b55a 948 tcp_conn->in.offset, tcp_conn->in.copy);
7ba24713
AA		 949
950 rc = iscsi_data_recv(conn);
951 if (rc) {
665b44ae 952 if (rc == -EAGAIN)
7ba24713 953 goto again;
d82967c7 954 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7ba24713
AA		 955 return 0;
956 }
dbdb016d
MC		 957
958 if (tcp_conn->in.padding)
959 tcp_conn->in_progress = IN_PROGRESS_PAD_RECV;
960 else if (conn->datadgst_en)
5bb0b55a 961 tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
dbdb016d
MC		 962 else
963 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
964 tcp_conn->data_copied = 0;
965 }
966
967 if (tcp_conn->in_progress == IN_PROGRESS_PAD_RECV &&
968 tcp_conn->in.copy) {
969 int copylen = min(tcp_conn->in.padding - tcp_conn->data_copied,
970 tcp_conn->in.copy);
971
972 tcp_conn->in.copy -= copylen;
973 tcp_conn->in.offset += copylen;
974 tcp_conn->data_copied += copylen;
975
976 if (tcp_conn->data_copied != tcp_conn->in.padding)
977 tcp_conn->in_progress = IN_PROGRESS_PAD_RECV;
978 else if (conn->datadgst_en)
979 tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
980 else
5bb0b55a 981 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
dbdb016d 982 tcp_conn->data_copied = 0;
7ba24713
AA		 983 }
984
985 debug_tcp("f, processed %d from out of %d padding %d\n",
5bb0b55a
MC		 986 tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding);
987 BUG_ON(tcp_conn->in.offset - offset > len);
7ba24713 988
5bb0b55a 989 if (tcp_conn->in.offset - offset != len) {
7ba24713 990 debug_tcp("continue to process %d bytes\n",
5bb0b55a 991 (int)len - (tcp_conn->in.offset - offset));
7ba24713
AA		 992 goto more;
993 }
994
995nomore:
5bb0b55a 996 processed = tcp_conn->in.offset - offset;
7ba24713
AA		 997 BUG_ON(processed == 0);
998 return processed;
999
1000again:
5bb0b55a 1001 processed = tcp_conn->in.offset - offset;
7ba24713
AA		 1002 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
1003 processed, (int)len, (int)rd_desc->count);
1004 BUG_ON(processed == 0);
1005 BUG_ON(processed > len);
1006
1007 conn->rxdata_octets += processed;
1008 return processed;
1009}
1010
1011static void
1012iscsi_tcp_data_ready(struct sock *sk, int flag)
1013{
1014 struct iscsi_conn *conn = sk->sk_user_data;
1015 read_descriptor_t rd_desc;
1016
1017 read_lock(&sk->sk_callback_lock);
1018
665b44ae
MC		 1019 /*
1020 * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv.
1021 * We set count to 1 because we want the network layer to
1022 * hand us all the skbs that are available. iscsi_tcp_data_recv
1023 * handled pdus that cross buffers or pdus that still need data.
1024 */
7ba24713 1025 rd_desc.arg.data = conn;
665b44ae 1026 rd_desc.count = 1;
7ba24713
AA		 1027 tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
1028
1029 read_unlock(&sk->sk_callback_lock);
1030}
1031
1032static void
1033iscsi_tcp_state_change(struct sock *sk)
1034{
5bb0b55a 1035 struct iscsi_tcp_conn *tcp_conn;
7ba24713
AA		 1036 struct iscsi_conn *conn;
1037 struct iscsi_session *session;
1038 void (*old_state_change)(struct sock *);
1039
1040 read_lock(&sk->sk_callback_lock);
1041
1042 conn = (struct iscsi_conn*)sk->sk_user_data;
1043 session = conn->session;
1044
e6273993
MC		 1045 if ((sk->sk_state == TCP_CLOSE_WAIT ||
1046 sk->sk_state == TCP_CLOSE) &&
1047 !atomic_read(&sk->sk_rmem_alloc)) {
7ba24713
AA		 1048 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1049 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1050 }
1051
5bb0b55a
MC		 1052 tcp_conn = conn->dd_data;
1053 old_state_change = tcp_conn->old_state_change;
7ba24713
AA		 1054
1055 read_unlock(&sk->sk_callback_lock);
1056
1057 old_state_change(sk);
1058}
1059
1060/**
1061 * iscsi_write_space - Called when more output buffer space is available
1062 * @sk: socket space is available for
1063 **/
1064static void
1065iscsi_write_space(struct sock *sk)
1066{
1067 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
5bb0b55a
MC		 1068 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1069
1070 tcp_conn->old_write_space(sk);
7ba24713 1071 debug_tcp("iscsi_write_space: cid %d\n", conn->id);
55e3299d 1072 scsi_queue_work(conn->session->host, &conn->xmitwork);
7ba24713
AA		 1073}
1074
1075static void
1076iscsi_conn_set_callbacks(struct iscsi_conn *conn)
1077{
5bb0b55a
MC		 1078 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1079 struct sock *sk = tcp_conn->sock->sk;
7ba24713
AA		 1080
1081 /* assign new callbacks */
1082 write_lock_bh(&sk->sk_callback_lock);
1083 sk->sk_user_data = conn;
5bb0b55a
MC		 1084 tcp_conn->old_data_ready = sk->sk_data_ready;
1085 tcp_conn->old_state_change = sk->sk_state_change;
1086 tcp_conn->old_write_space = sk->sk_write_space;
7ba24713
AA		 1087 sk->sk_data_ready = iscsi_tcp_data_ready;
1088 sk->sk_state_change = iscsi_tcp_state_change;
1089 sk->sk_write_space = iscsi_write_space;
1090 write_unlock_bh(&sk->sk_callback_lock);
1091}
1092
1093static void
1c83469d 1094iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
7ba24713 1095{
5bb0b55a 1096 struct sock *sk = tcp_conn->sock->sk;
7ba24713
AA		 1097
1098 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1099 write_lock_bh(&sk->sk_callback_lock);
1100 sk->sk_user_data = NULL;
5bb0b55a
MC		 1101 sk->sk_data_ready = tcp_conn->old_data_ready;
1102 sk->sk_state_change = tcp_conn->old_state_change;
1103 sk->sk_write_space = tcp_conn->old_write_space;
7ba24713
AA		 1104 sk->sk_no_check = 0;
1105 write_unlock_bh(&sk->sk_callback_lock);
1106}
1107
1108/**
1109 * iscsi_send - generic send routine
1110 * @sk: kernel's socket
1111 * @buf: buffer to write from
1112 * @size: actual size to write
1113 * @flags: socket's flags
7ba24713
AA		 1114 */
1115static inline int
56851698 1116iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags)
7ba24713 1117{
5bb0b55a
MC		 1118 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1119 struct socket *sk = tcp_conn->sock;
3219e529 1120 int offset = buf->sg.offset + buf->sent, res;
7ba24713 1121
7cae5159
MC		 1122 /*
1123 * if we got use_sg=0 or are sending something we kmallocd
1124 * then we did not have to do kmap (kmap returns page_address)
1125 *
1126 * if we got use_sg > 0, but had to drop down, we do not
1127 * set clustering so this should only happen for that
1128 * slab case.
1129 */
1130 if (buf->use_sendmsg)
3219e529 1131 res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
7cae5159 1132 else
3219e529
MC		 1133 res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags);
1134
1135 if (res >= 0) {
1136 conn->txdata_octets += res;
1137 buf->sent += res;
1138 return res;
1139 }
1140
1141 tcp_conn->sendpage_failures_cnt++;
1142 if (res == -EAGAIN)
1143 res = -ENOBUFS;
1144 else
1145 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1146 return res;
7ba24713
AA		 1147}
1148
1149/**
1150 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1151 * @conn: iscsi connection
1152 * @buf: buffer to write from
1153 * @datalen: lenght of data to be sent after the header
1154 *
1155 * Notes:
1156 * (Tx, Fast Path)
1157 **/
1158static inline int
1159iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
1160{
7ba24713
AA		 1161 int flags = 0; /* MSG_DONTWAIT; */
1162 int res, size;
1163
1164 size = buf->sg.length - buf->sent;
1165 BUG_ON(buf->sent + size > buf->sg.length);
1166 if (buf->sent + size != buf->sg.length || datalen)
1167 flags |= MSG_MORE;
1168
56851698 1169 res = iscsi_send(conn, buf, size, flags);
7ba24713
AA		 1170 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
1171 if (res >= 0) {
7ba24713
AA		 1172 if (size != res)
1173 return -EAGAIN;
1174 return 0;
3219e529 1175 }
7ba24713
AA		 1176
1177 return res;
1178}
1179
1180/**
1181 * iscsi_sendpage - send one page of iSCSI Data-Out.
1182 * @conn: iscsi connection
1183 * @buf: buffer to write from
1184 * @count: remaining data
1185 * @sent: number of bytes sent
1186 *
1187 * Notes:
1188 * (Tx, Fast Path)
1189 **/
1190static inline int
1191iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
1192 int *count, int *sent)
1193{
7ba24713
AA		 1194 int flags = 0; /* MSG_DONTWAIT; */
1195 int res, size;
1196
1197 size = buf->sg.length - buf->sent;
1198 BUG_ON(buf->sent + size > buf->sg.length);
1199 if (size > *count)
1200 size = *count;
b13941f6 1201 if (buf->sent + size != buf->sg.length || *count != size)
7ba24713
AA		 1202 flags |= MSG_MORE;
1203
56851698 1204 res = iscsi_send(conn, buf, size, flags);
7ba24713
AA		 1205 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1206 size, buf->sent, *count, *sent, res);
1207 if (res >= 0) {
7ba24713
AA		 1208 *count -= res;
1209 *sent += res;
1210 if (size != res)
1211 return -EAGAIN;
1212 return 0;
3219e529 1213 }
7ba24713
AA		 1214
1215 return res;
1216}
1217
1218static inline void
5bb0b55a 1219iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
62f38300 1220 struct iscsi_tcp_cmd_task *tcp_ctask)
7ba24713 1221{
c9802cd9 1222 crypto_hash_init(&tcp_conn->tx_hash);
5bb0b55a 1223 tcp_ctask->digest_count = 4;
7ba24713
AA		 1224}
1225
7ba24713
AA		 1226/**
1227 * iscsi_solicit_data_cont - initialize next Data-Out
1228 * @conn: iscsi connection
1229 * @ctask: scsi command task
1230 * @r2t: R2T info
1231 * @left: bytes left to transfer
1232 *
1233 * Notes:
1234 * Initialize next Data-Out within this R2T sequence and continue
1235 * to process next Scatter-Gather element(if any) of this SCSI command.
1236 *
1237 * Called under connection lock.
1238 **/
1239static void
1240iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1241 struct iscsi_r2t_info *r2t, int left)
1242{
1243 struct iscsi_data *hdr;
7ba24713
AA		 1244 struct scsi_cmnd *sc = ctask->sc;
1245 int new_offset;
1246
ffbfe925 1247 hdr = &r2t->dtask.hdr;
7ba24713
AA		 1248 memset(hdr, 0, sizeof(struct iscsi_data));
1249 hdr->ttt = r2t->ttt;
1250 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
1251 r2t->solicit_datasn++;
1252 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
5bb0b55a
MC		 1253 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1254 hdr->itt = ctask->hdr->itt;
7ba24713
AA		 1255 hdr->exp_statsn = r2t->exp_statsn;
1256 new_offset = r2t->data_offset + r2t->sent;
1257 hdr->offset = cpu_to_be32(new_offset);
1258 if (left > conn->max_xmit_dlength) {
1259 hton24(hdr->dlength, conn->max_xmit_dlength);
1260 r2t->data_count = conn->max_xmit_dlength;
1261 } else {
1262 hton24(hdr->dlength, left);
1263 r2t->data_count = left;
1264 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1265 }
1266 conn->dataout_pdus_cnt++;
1267
6e458cc9 1268 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
af973481 1269 sizeof(struct iscsi_hdr));
7ba24713 1270
62f38300
MC		 1271 if (iscsi_buf_left(&r2t->sendbuf))
1272 return;
1273
1274 if (sc->use_sg) {
7ba24713
AA		 1275 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1276 r2t->sg += 1;
62f38300
MC		 1277 } else {
1278 iscsi_buf_init_iov(&r2t->sendbuf,
7ba24713
AA		 1279 (char*)sc->request_buffer + new_offset,
1280 r2t->data_count);
62f38300
MC		 1281 r2t->sg = NULL;
1282 }
7ba24713
AA		 1283}
1284
62f38300
MC		 1285static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask,
1286 unsigned long len)
7ba24713 1287{
62f38300
MC		 1288 tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1);
1289 if (!tcp_ctask->pad_count)
1290 return;
7ba24713 1291
62f38300
MC		 1292 tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count;
1293 debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count);
1294 tcp_ctask->xmstate |= XMSTATE_W_PAD;
7ba24713
AA		 1295}
1296
1297/**
5bb0b55a 1298 * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
7ba24713
AA		 1299 * @conn: iscsi connection
1300 * @ctask: scsi command task
1301 * @sc: scsi command
1302 **/
1303static void
5bb0b55a 1304iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
7ba24713 1305{
5bb0b55a 1306 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
7ba24713 1307
5bb0b55a 1308 BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
218432c6 1309 tcp_ctask->xmstate = XMSTATE_CMD_HDR_INIT;
7ba24713
AA		 1310}
1311
1312/**
5bb0b55a 1313 * iscsi_tcp_mtask_xmit - xmit management(immediate) task
7ba24713
AA		 1314 * @conn: iscsi connection
1315 * @mtask: task management task
1316 *
1317 * Notes:
1318 * The function can return -EAGAIN in which case caller must
1319 * call it again later, or recover. '0' return code means successful
1320 * xmit.
1321 *
218432c6
MC		 1322 * Management xmit state machine consists of these states:
1323 * XMSTATE_IMM_HDR_INIT - calculate digest of PDU Header
1324 * XMSTATE_IMM_HDR - PDU Header xmit in progress
1325 * XMSTATE_IMM_DATA - PDU Data xmit in progress
1326 * XMSTATE_IDLE - management PDU is done
7ba24713
AA		 1327 **/
1328static int
5bb0b55a 1329iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
7ba24713 1330{
5bb0b55a 1331 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
3219e529 1332 int rc;
7ba24713
AA		 1333
1334 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
5bb0b55a 1335 conn->id, tcp_mtask->xmstate, mtask->itt);
7ba24713 1336
218432c6
MC		 1337 if (tcp_mtask->xmstate & XMSTATE_IMM_HDR_INIT) {
1338 iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
1339 sizeof(struct iscsi_hdr));
1340
1341 if (mtask->data_count) {
5bb0b55a 1342 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
218432c6
MC		 1343 iscsi_buf_init_iov(&tcp_mtask->sendbuf,
1344 (char*)mtask->data,
1345 mtask->data_count);
1346 }
1347
af973481 1348 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
30a6c652 1349 conn->stop_stage != STOP_CONN_RECOVER &&
af973481 1350 conn->hdrdgst_en)
5bb0b55a
MC		 1351 iscsi_hdr_digest(conn, &tcp_mtask->headbuf,
1352 (u8*)tcp_mtask->hdrext);
218432c6
MC		 1353
1354 tcp_mtask->sent = 0;
1355 tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR_INIT;
1356 tcp_mtask->xmstate |= XMSTATE_IMM_HDR;
1357 }
1358
1359 if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) {
3219e529
MC		 1360 rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
1361 mtask->data_count);
218432c6 1362 if (rc)
3219e529 1363 return rc;
218432c6 1364 tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR;
7ba24713
AA		 1365 }
1366
5bb0b55a 1367 if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) {
7ba24713 1368 BUG_ON(!mtask->data_count);
5bb0b55a 1369 tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
7ba24713
AA		 1370 /* FIXME: implement.
1371 * Virtual buffer could be spreaded across multiple pages...
1372 */
1373 do {
3219e529
MC		 1374 int rc;
1375
1376 rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf,
1377 &mtask->data_count, &tcp_mtask->sent);
1378 if (rc) {
5bb0b55a 1379 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
3219e529 1380 return rc;
7ba24713
AA		 1381 }
1382 } while (mtask->data_count);
1383 }
1384
5bb0b55a 1385 BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE);
b4377356 1386 if (mtask->hdr->itt == RESERVED_ITT) {
5bb0b55a
MC		 1387 struct iscsi_session *session = conn->session;
1388
1389 spin_lock_bh(&session->lock);
1390 list_del(&conn->mtask->running);
1391 __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask,
1392 sizeof(void*));
1393 spin_unlock_bh(&session->lock);
1394 }
7ba24713
AA		 1395 return 0;
1396}
1397
218432c6
MC		 1398static int
1399iscsi_send_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
7ba24713 1400{
218432c6
MC		 1401 struct scsi_cmnd *sc = ctask->sc;
1402 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1403 int rc = 0;
3219e529 1404
218432c6
MC		 1405 if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_INIT) {
1406 tcp_ctask->sent = 0;
1407 tcp_ctask->sg_count = 0;
1408 tcp_ctask->exp_datasn = 0;
1409
1410 if (sc->sc_data_direction == DMA_TO_DEVICE) {
1411 if (sc->use_sg) {
1412 struct scatterlist *sg = sc->request_buffer;
1413
1414 iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
1415 tcp_ctask->sg = sg + 1;
1416 tcp_ctask->bad_sg = sg + sc->use_sg;
1417 } else {
1418 iscsi_buf_init_iov(&tcp_ctask->sendbuf,
1419 sc->request_buffer,
1420 sc->request_bufflen);
1421 tcp_ctask->sg = NULL;
1422 tcp_ctask->bad_sg = NULL;
1423 }
7ba24713 1424
218432c6
MC		 1425 debug_scsi("cmd [itt 0x%x total %d imm_data %d "
1426 "unsol count %d, unsol offset %d]\n",
1427 ctask->itt, sc->request_bufflen,
1428 ctask->imm_count, ctask->unsol_count,
1429 ctask->unsol_offset);
1430 }
5bb0b55a 1431
218432c6
MC		 1432 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
1433 sizeof(struct iscsi_hdr));
1434
1435 if (conn->hdrdgst_en)
1436 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1437 (u8*)tcp_ctask->hdrext);
1438 tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_INIT;
1439 tcp_ctask->xmstate |= XMSTATE_CMD_HDR_XMIT;
62f38300
MC		 1440 }
1441
218432c6
MC		 1442 if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_XMIT) {
1443 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
1444 if (rc)
1445 return rc;
1446 tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_XMIT;
1447
1448 if (sc->sc_data_direction != DMA_TO_DEVICE)
1449 return 0;
1450
1451 if (ctask->imm_count) {
1452 tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
1453 iscsi_set_padding(tcp_ctask, ctask->imm_count);
62f38300 1454
218432c6
MC		 1455 if (ctask->conn->datadgst_en) {
1456 iscsi_data_digest_init(ctask->conn->dd_data,
1457 tcp_ctask);
1458 tcp_ctask->immdigest = 0;
1459 }
62f38300 1460 }
62f38300 1461
218432c6
MC		 1462 if (ctask->unsol_count)
1463 tcp_ctask->xmstate |=
1464 XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
1465 }
1466 return rc;
7ba24713
AA		 1467}
1468
62f38300
MC		 1469static int
1470iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
7ba24713 1471{
5bb0b55a 1472 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
62f38300
MC		 1473 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1474 int sent = 0, rc;
5bb0b55a 1475
62f38300
MC		 1476 if (tcp_ctask->xmstate & XMSTATE_W_PAD) {
1477 iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad,
1478 tcp_ctask->pad_count);
1479 if (conn->datadgst_en)
c9802cd9
JB		 1480 crypto_hash_update(&tcp_conn->tx_hash,
1481 &tcp_ctask->sendbuf.sg,
1482 tcp_ctask->sendbuf.sg.length);
62f38300
MC		 1483 } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD))
1484 return 0;
1485
1486 tcp_ctask->xmstate &= ~XMSTATE_W_PAD;
1487 tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD;
1488 debug_scsi("sending %d pad bytes for itt 0x%x\n",
1489 tcp_ctask->pad_count, ctask->itt);
1490 rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count,
1491 &sent);
3219e529 1492 if (rc) {
62f38300
MC		 1493 debug_scsi("padding send failed %d\n", rc);
1494 tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD;
7ba24713 1495 }
3219e529 1496 return rc;
7ba24713
AA		 1497}
1498
62f38300
MC		 1499static int
1500iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1501 struct iscsi_buf *buf, uint32_t *digest)
7ba24713 1502{
62f38300
MC		 1503 struct iscsi_tcp_cmd_task *tcp_ctask;
1504 struct iscsi_tcp_conn *tcp_conn;
1505 int rc, sent = 0;
5bb0b55a 1506
62f38300
MC		 1507 if (!conn->datadgst_en)
1508 return 0;
7ba24713 1509
62f38300
MC		 1510 tcp_ctask = ctask->dd_data;
1511 tcp_conn = conn->dd_data;
7ba24713 1512
62f38300 1513 if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) {
c9802cd9 1514 crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest);
62f38300
MC		 1515 iscsi_buf_init_iov(buf, (char*)digest, 4);
1516 }
1517 tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST;
7ba24713 1518
62f38300
MC		 1519 rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent);
1520 if (!rc)
1521 debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest,
1522 ctask->itt);
1523 else {
1524 debug_scsi("sending digest 0x%x failed for itt 0x%x!\n",
1525 *digest, ctask->itt);
1526 tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST;
7ba24713 1527 }
62f38300
MC		 1528 return rc;
1529}
7ba24713 1530
62f38300
MC		 1531static int
1532iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf,
1533 struct scatterlist **sg, int *sent, int *count,
1534 struct iscsi_buf *digestbuf, uint32_t *digest)
1535{
1536 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1537 struct iscsi_conn *conn = ctask->conn;
1538 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1539 int rc, buf_sent, offset;
1540
1541 while (*count) {
1542 buf_sent = 0;
1543 offset = sendbuf->sent;
1544
1545 rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent);
1546 *sent = *sent + buf_sent;
1547 if (buf_sent && conn->datadgst_en)
c9802cd9 1548 partial_sg_digest_update(&tcp_conn->tx_hash,
62f38300
MC		 1549 &sendbuf->sg, sendbuf->sg.offset + offset,
1550 buf_sent);
1551 if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) {
1552 iscsi_buf_init_sg(sendbuf, *sg);
1553 *sg = *sg + 1;
7ba24713 1554 }
62f38300
MC		 1555
1556 if (rc)
1557 return rc;
7ba24713
AA		 1558 }
1559
62f38300
MC		 1560 rc = iscsi_send_padding(conn, ctask);
1561 if (rc)
1562 return rc;
1563
1564 return iscsi_send_digest(conn, ctask, digestbuf, digest);
7ba24713
AA		 1565}
1566
62f38300
MC		 1567static int
1568iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
7ba24713 1569{
5bb0b55a 1570 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
7ba24713 1571 struct iscsi_data_task *dtask;
3219e529 1572 int rc;
7ba24713 1573
5bb0b55a
MC		 1574 tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
1575 if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
62f38300
MC		 1576 dtask = &tcp_ctask->unsol_dtask;
1577
ffd0436e
MC		 1578 iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr);
1579 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
1580 sizeof(struct iscsi_hdr));
af973481 1581 if (conn->hdrdgst_en)
5bb0b55a 1582 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
af973481 1583 (u8*)dtask->hdrext);
62f38300 1584
5bb0b55a 1585 tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT;
62f38300 1586 iscsi_set_padding(tcp_ctask, ctask->data_count);
7ba24713 1587 }
3219e529
MC		 1588
1589 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
1590 if (rc) {
5bb0b55a
MC		 1591 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1592 tcp_ctask->xmstate |= XMSTATE_UNS_HDR;
3219e529 1593 return rc;
7ba24713
AA		 1594 }
1595
dd8c0d95
MC		 1596 if (conn->datadgst_en) {
1597 dtask = &tcp_ctask->unsol_dtask;
1598 iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
1599 dtask->digest = 0;
1600 }
1601
7ba24713 1602 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
5bb0b55a 1603 ctask->itt, ctask->unsol_count, tcp_ctask->sent);
7ba24713
AA		 1604 return 0;
1605}
1606
62f38300
MC		 1607static int
1608iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
7ba24713 1609{
5bb0b55a 1610 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
3219e529 1611 int rc;
7ba24713 1612
62f38300
MC		 1613 if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) {
1614 BUG_ON(!ctask->unsol_count);
1615 tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR;
1616send_hdr:
1617 rc = iscsi_send_unsol_hdr(conn, ctask);
1618 if (rc)
1619 return rc;
7ba24713
AA		 1620 }
1621
62f38300
MC		 1622 if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) {
1623 struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask;
5bb0b55a 1624 int start = tcp_ctask->sent;
7ba24713 1625
62f38300
MC		 1626 rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
1627 &tcp_ctask->sent, &ctask->data_count,
1628 &dtask->digestbuf, &dtask->digest);
5bb0b55a 1629 ctask->unsol_count -= tcp_ctask->sent - start;
62f38300
MC		 1630 if (rc)
1631 return rc;
1632 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
7ba24713 1633 /*
62f38300
MC		 1634 * Done with the Data-Out. Next, check if we need
1635 * to send another unsolicited Data-Out.
7ba24713 1636 */
62f38300
MC		 1637 if (ctask->unsol_count) {
1638 debug_scsi("sending more uns\n");
1639 tcp_ctask->xmstate |= XMSTATE_UNS_INIT;
1640 goto send_hdr;
7ba24713 1641 }
7ba24713 1642 }
7ba24713
AA		 1643 return 0;
1644}
1645
62f38300
MC		 1646static int iscsi_send_sol_pdu(struct iscsi_conn *conn,
1647 struct iscsi_cmd_task *ctask)
7ba24713 1648{
5bb0b55a 1649 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
62f38300
MC		 1650 struct iscsi_session *session = conn->session;
1651 struct iscsi_r2t_info *r2t;
1652 struct iscsi_data_task *dtask;
3219e529 1653 int left, rc;
7ba24713 1654
218432c6 1655 if (tcp_ctask->xmstate & XMSTATE_SOL_HDR_INIT) {
db37c505
MC		 1656 if (!tcp_ctask->r2t) {
1657 spin_lock_bh(&session->lock);
62f38300
MC		 1658 __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
1659 sizeof(void*));
db37c505
MC		 1660 spin_unlock_bh(&session->lock);
1661 }
62f38300
MC		 1662send_hdr:
1663 r2t = tcp_ctask->r2t;
1664 dtask = &r2t->dtask;
7ba24713 1665
62f38300
MC		 1666 if (conn->hdrdgst_en)
1667 iscsi_hdr_digest(conn, &r2t->headbuf,
1668 (u8*)dtask->hdrext);
218432c6
MC		 1669 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR_INIT;
1670 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
1671 }
1672
1673 if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
1674 r2t = tcp_ctask->r2t;
1675 dtask = &r2t->dtask;
1676
62f38300 1677 rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
218432c6 1678 if (rc)
3219e529 1679 return rc;
218432c6
MC		 1680 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1681 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
7ba24713 1682
7ba24713 1683 if (conn->datadgst_en) {
dd8c0d95
MC		 1684 iscsi_data_digest_init(conn->dd_data, tcp_ctask);
1685 dtask->digest = 0;
7ba24713 1686 }
7ba24713 1687
62f38300
MC		 1688 iscsi_set_padding(tcp_ctask, r2t->data_count);
1689 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
1690 r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
1691 r2t->sent);
7ba24713
AA		 1692 }
1693
62f38300
MC		 1694 if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) {
1695 r2t = tcp_ctask->r2t;
1696 dtask = &r2t->dtask;
7ba24713 1697
62f38300
MC		 1698 rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg,
1699 &r2t->sent, &r2t->data_count,
1700 &dtask->digestbuf, &dtask->digest);
1701 if (rc)
1702 return rc;
1703 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
7ba24713 1704
62f38300
MC		 1705 /*
1706 * Done with this Data-Out. Next, check if we have
1707 * to send another Data-Out for this R2T.
1708 */
1709 BUG_ON(r2t->data_length - r2t->sent < 0);
1710 left = r2t->data_length - r2t->sent;
1711 if (left) {
1712 iscsi_solicit_data_cont(conn, ctask, r2t, left);
62f38300
MC		 1713 goto send_hdr;
1714 }
7ba24713 1715
62f38300
MC		 1716 /*
1717 * Done with this R2T. Check if there are more
1718 * outstanding R2Ts ready to be processed.
1719 */
1720 spin_lock_bh(&session->lock);
1721 tcp_ctask->r2t = NULL;
1722 __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
1723 sizeof(void*));
1724 if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t,
1725 sizeof(void*))) {
1726 tcp_ctask->r2t = r2t;
62f38300
MC		 1727 spin_unlock_bh(&session->lock);
1728 goto send_hdr;
7ba24713 1729 }
62f38300 1730 spin_unlock_bh(&session->lock);
7ba24713 1731 }
7ba24713
AA		 1732 return 0;
1733}
1734
218432c6
MC		 1735/**
1736 * iscsi_tcp_ctask_xmit - xmit normal PDU task
1737 * @conn: iscsi connection
1738 * @ctask: iscsi command task
1739 *
1740 * Notes:
1741 * The function can return -EAGAIN in which case caller must
1742 * call it again later, or recover. '0' return code means successful
1743 * xmit.
1744 * The function is devided to logical helpers (above) for the different
1745 * xmit stages.
1746 *
1747 *iscsi_send_cmd_hdr()
1748 * XMSTATE_CMD_HDR_INIT - prepare Header and Data buffers Calculate
1749 * Header Digest
1750 * XMSTATE_CMD_HDR_XMIT - Transmit header in progress
1751 *
1752 *iscsi_send_padding
1753 * XMSTATE_W_PAD - Prepare and send pading
1754 * XMSTATE_W_RESEND_PAD - retry send pading
1755 *
1756 *iscsi_send_digest
1757 * XMSTATE_W_RESEND_DATA_DIGEST - Finalize and send Data Digest
1758 * XMSTATE_W_RESEND_DATA_DIGEST - retry sending digest
1759 *
1760 *iscsi_send_unsol_hdr
1761 * XMSTATE_UNS_INIT - prepare un-solicit data header and digest
1762 * XMSTATE_UNS_HDR - send un-solicit header
1763 *
1764 *iscsi_send_unsol_pdu
1765 * XMSTATE_UNS_DATA - send un-solicit data in progress
1766 *
1767 *iscsi_send_sol_pdu
1768 * XMSTATE_SOL_HDR_INIT - solicit data header and digest initialize
1769 * XMSTATE_SOL_HDR - send solicit header
1770 * XMSTATE_SOL_DATA - send solicit data
1771 *
1772 *iscsi_tcp_ctask_xmit
1773 * XMSTATE_IMM_DATA - xmit managment data (??)
1774 **/
7ba24713 1775static int
5bb0b55a 1776iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
7ba24713 1777{
5bb0b55a 1778 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
7ba24713
AA		 1779 int rc = 0;
1780
1781 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
5bb0b55a 1782 conn->id, tcp_ctask->xmstate, ctask->itt);
7ba24713 1783
218432c6
MC		 1784 rc = iscsi_send_cmd_hdr(conn, ctask);
1785 if (rc)
1786 return rc;
1787 if (ctask->sc->sc_data_direction != DMA_TO_DEVICE)
1788 return 0;
7ba24713 1789
5bb0b55a 1790 if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) {
62f38300
MC		 1791 rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
1792 &tcp_ctask->sent, &ctask->imm_count,
1793 &tcp_ctask->immbuf, &tcp_ctask->immdigest);
7ba24713
AA		 1794 if (rc)
1795 return rc;
62f38300 1796 tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA;
7ba24713
AA		 1797 }
1798
62f38300
MC		 1799 rc = iscsi_send_unsol_pdu(conn, ctask);
1800 if (rc)
1801 return rc;
7ba24713 1802
62f38300
MC		 1803 rc = iscsi_send_sol_pdu(conn, ctask);
1804 if (rc)
1805 return rc;
7ba24713
AA		 1806
1807 return rc;
1808}
1809
5bb0b55a
MC		 1810static struct iscsi_cls_conn *
1811iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
7ba24713 1812{
5bb0b55a
MC		 1813 struct iscsi_conn *conn;
1814 struct iscsi_cls_conn *cls_conn;
1815 struct iscsi_tcp_conn *tcp_conn;
7ba24713 1816
5bb0b55a
MC		 1817 cls_conn = iscsi_conn_setup(cls_session, conn_idx);
1818 if (!cls_conn)
1819 return NULL;
1820 conn = cls_conn->dd_data;
7ba24713 1821 /*
5bb0b55a
MC		 1822 * due to strange issues with iser these are not set
1823 * in iscsi_conn_setup
7ba24713 1824 */
bf32ed33 1825 conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN;
7ba24713 1826
5bb0b55a
MC		 1827 tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
1828 if (!tcp_conn)
1829 goto tcp_conn_alloc_fail;
7ba24713 1830
5bb0b55a
MC		 1831 conn->dd_data = tcp_conn;
1832 tcp_conn->iscsi_conn = conn;
1833 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1834 /* initial operational parameters */
1835 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
7ba24713 1836
c9802cd9
JB		 1837 tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
1838 CRYPTO_ALG_ASYNC);
1839 tcp_conn->tx_hash.flags = 0;
0f238418
MC		 1840 if (IS_ERR(tcp_conn->tx_hash.tfm)) {
1841 printk(KERN_ERR "Could not create connection due to crc32c "
1842 "loading error %ld. Make sure the crc32c module is "
1843 "built as a module or into the kernel\n",
1844 PTR_ERR(tcp_conn->tx_hash.tfm));
dd8c0d95 1845 goto free_tcp_conn;
0f238418 1846 }
dd8c0d95 1847
c9802cd9
JB		 1848 tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
1849 CRYPTO_ALG_ASYNC);
1850 tcp_conn->rx_hash.flags = 0;
0f238418
MC		 1851 if (IS_ERR(tcp_conn->rx_hash.tfm)) {
1852 printk(KERN_ERR "Could not create connection due to crc32c "
1853 "loading error %ld. Make sure the crc32c module is "
1854 "built as a module or into the kernel\n",
1855 PTR_ERR(tcp_conn->rx_hash.tfm));
dd8c0d95 1856 goto free_tx_tfm;
0f238418 1857 }
dd8c0d95 1858
5bb0b55a 1859 return cls_conn;
7ba24713 1860
dd8c0d95 1861free_tx_tfm:
c9802cd9 1862 crypto_free_hash(tcp_conn->tx_hash.tfm);
dd8c0d95
MC		 1863free_tcp_conn:
1864 kfree(tcp_conn);
5bb0b55a
MC		 1865tcp_conn_alloc_fail:
1866 iscsi_conn_teardown(cls_conn);
1867 return NULL;
7ba24713
AA		 1868}
1869
1c83469d
MC		 1870static void
1871iscsi_tcp_release_conn(struct iscsi_conn *conn)
1872{
22236961 1873 struct iscsi_session *session = conn->session;
1c83469d 1874 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
22236961 1875 struct socket *sock = tcp_conn->sock;
1c83469d 1876
22236961 1877 if (!sock)
1c83469d
MC		 1878 return;
1879
22236961 1880 sock_hold(sock->sk);
1c83469d 1881 iscsi_conn_restore_callbacks(tcp_conn);
22236961 1882 sock_put(sock->sk);
1c83469d 1883
22236961 1884 spin_lock_bh(&session->lock);
1c83469d
MC		 1885 tcp_conn->sock = NULL;
1886 conn->recv_lock = NULL;
22236961
MC		 1887 spin_unlock_bh(&session->lock);
1888 sockfd_put(sock);
1c83469d
MC		 1889}
1890
7ba24713 1891static void
5bb0b55a 1892iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
7ba24713 1893{
5bb0b55a
MC		 1894 struct iscsi_conn *conn = cls_conn->dd_data;
1895 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
7ba24713 1896
1c83469d 1897 iscsi_tcp_release_conn(conn);
5bb0b55a 1898 iscsi_conn_teardown(cls_conn);
7ba24713 1899
534284a0
PW		 1900 if (tcp_conn->tx_hash.tfm)
1901 crypto_free_hash(tcp_conn->tx_hash.tfm);
1902 if (tcp_conn->rx_hash.tfm)
1903 crypto_free_hash(tcp_conn->rx_hash.tfm);
7ba24713 1904
5bb0b55a
MC		 1905 kfree(tcp_conn);
1906}
7ba24713 1907
1c83469d
MC		 1908static void
1909iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1910{
1911 struct iscsi_conn *conn = cls_conn->dd_data;
d5390f5f 1912 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1c83469d
MC		 1913
1914 iscsi_conn_stop(cls_conn, flag);
1915 iscsi_tcp_release_conn(conn);
d5390f5f 1916 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
1c83469d
MC		 1917}
1918
22236961
MC		 1919static int iscsi_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock,
1920 char *buf, int *port,
1921 int (*getname)(struct socket *, struct sockaddr *,
1922 int *addrlen))
1923{
1924 struct sockaddr_storage *addr;
1925 struct sockaddr_in6 *sin6;
1926 struct sockaddr_in *sin;
1927 int rc = 0, len;
1928
1929 addr = kmalloc(GFP_KERNEL, sizeof(*addr));
1930 if (!addr)
1931 return -ENOMEM;
1932
1933 if (getname(sock, (struct sockaddr *) addr, &len)) {
1934 rc = -ENODEV;
1935 goto free_addr;
1936 }
1937
1938 switch (addr->ss_family) {
1939 case AF_INET:
1940 sin = (struct sockaddr_in *)addr;
1941 spin_lock_bh(&conn->session->lock);
1942 sprintf(buf, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr));
1943 *port = be16_to_cpu(sin->sin_port);
1944 spin_unlock_bh(&conn->session->lock);
1945 break;
1946 case AF_INET6:
1947 sin6 = (struct sockaddr_in6 *)addr;
1948 spin_lock_bh(&conn->session->lock);
1949 sprintf(buf, NIP6_FMT, NIP6(sin6->sin6_addr));
1950 *port = be16_to_cpu(sin6->sin6_port);
1951 spin_unlock_bh(&conn->session->lock);
1952 break;
1953 }
1954free_addr:
1955 kfree(addr);
1956 return rc;
1957}
1958
5bb0b55a
MC		 1959static int
1960iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
264faaaa 1961 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
5bb0b55a
MC		 1962 int is_leading)
1963{
1964 struct iscsi_conn *conn = cls_conn->dd_data;
1965 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1966 struct sock *sk;
1967 struct socket *sock;
1968 int err;
7ba24713 1969
5bb0b55a 1970 /* lookup for existing socket */
264faaaa 1971 sock = sockfd_lookup((int)transport_eph, &err);
5bb0b55a
MC		 1972 if (!sock) {
1973 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
1974 return -EEXIST;
7ba24713 1975 }
22236961
MC		 1976 /*
1977 * copy these values now because if we drop the session
1978 * userspace may still want to query the values since we will
1979 * be using them for the reconnect
1980 */
1981 err = iscsi_tcp_get_addr(conn, sock, conn->portal_address,
1982 &conn->portal_port, kernel_getpeername);
1983 if (err)
1984 goto free_socket;
1985
1986 err = iscsi_tcp_get_addr(conn, sock, conn->local_address,
1987 &conn->local_port, kernel_getsockname);
1988 if (err)
1989 goto free_socket;
7ba24713 1990
5bb0b55a
MC		 1991 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
1992 if (err)
22236961 1993 goto free_socket;
7ba24713 1994
67a61114
MC		 1995 /* bind iSCSI connection and socket */
1996 tcp_conn->sock = sock;
7ba24713 1997
67a61114
MC		 1998 /* setup Socket parameters */
1999 sk = sock->sk;
2000 sk->sk_reuse = 1;
2001 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
2002 sk->sk_allocation = GFP_ATOMIC;
7ba24713 2003
67a61114 2004 /* FIXME: disable Nagle's algorithm */
7ba24713 2005
67a61114
MC		 2006 /*
2007 * Intercept TCP callbacks for sendfile like receive
2008 * processing.
2009 */
2010 conn->recv_lock = &sk->sk_callback_lock;
2011 iscsi_conn_set_callbacks(conn);
2012 tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
2013 /*
2014 * set receive state machine into initial state
2015 */
2016 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
7ba24713 2017 return 0;
22236961
MC		 2018
2019free_socket:
2020 sockfd_put(sock);
2021 return err;
7ba24713
AA		 2022}
2023
5bb0b55a 2024/* called with host lock */
30a6c652 2025static void
77a23c21 2026iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
7ba24713 2027{
5bb0b55a 2028 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
218432c6 2029 tcp_mtask->xmstate = XMSTATE_IMM_HDR_INIT;
7ba24713
AA		 2030}
2031
2032static int
2033iscsi_r2tpool_alloc(struct iscsi_session *session)
2034{
2035 int i;
2036 int cmd_i;
2037
2038 /*
2039 * initialize per-task: R2T pool and xmit queue
2040 */
2041 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2042 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
5bb0b55a 2043 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
7ba24713
AA		 2044
2045 /*
2046 * pre-allocated x4 as much r2ts to handle race when
2047 * target acks DataOut faster than we data_xmit() queues
2048 * could replenish r2tqueue.
2049 */
2050
2051 /* R2T pool */
5bb0b55a
MC		 2052 if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
2053 (void***)&tcp_ctask->r2ts,
2054 sizeof(struct iscsi_r2t_info))) {
7ba24713
AA		 2055 goto r2t_alloc_fail;
2056 }
2057
2058 /* R2T xmit queue */
5bb0b55a 2059 tcp_ctask->r2tqueue = kfifo_alloc(
7ba24713 2060 session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
5bb0b55a
MC		 2061 if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
2062 iscsi_pool_free(&tcp_ctask->r2tpool,
2063 (void**)tcp_ctask->r2ts);
7ba24713
AA		 2064 goto r2t_alloc_fail;
2065 }
7ba24713
AA		 2066 }
2067
2068 return 0;
2069
2070r2t_alloc_fail:
2071 for (i = 0; i < cmd_i; i++) {
5bb0b55a
MC		 2072 struct iscsi_cmd_task *ctask = session->cmds[i];
2073 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2074
5bb0b55a
MC		 2075 kfifo_free(tcp_ctask->r2tqueue);
2076 iscsi_pool_free(&tcp_ctask->r2tpool,
2077 (void**)tcp_ctask->r2ts);
7ba24713
AA		 2078 }
2079 return -ENOMEM;
2080}
2081
2082static void
2083iscsi_r2tpool_free(struct iscsi_session *session)
2084{
2085 int i;
2086
2087 for (i = 0; i < session->cmds_max; i++) {
5bb0b55a
MC		 2088 struct iscsi_cmd_task *ctask = session->cmds[i];
2089 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
7ba24713 2090
5bb0b55a
MC		 2091 kfifo_free(tcp_ctask->r2tqueue);
2092 iscsi_pool_free(&tcp_ctask->r2tpool,
2093 (void**)tcp_ctask->r2ts);
7ba24713 2094 }
7ba24713
AA		 2095}
2096
2097static int
7b7232f3 2098iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
5c75b7fc 2099 char *buf, int buflen)
7ba24713 2100{
7b7232f3 2101 struct iscsi_conn *conn = cls_conn->dd_data;
7ba24713 2102 struct iscsi_session *session = conn->session;
5bb0b55a 2103 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
5c75b7fc 2104 int value;
7ba24713 2105
7ba24713 2106 switch(param) {
7ba24713 2107 case ISCSI_PARAM_HDRDGST_EN:
5c75b7fc 2108 iscsi_set_param(cls_conn, param, buf, buflen);
5bb0b55a 2109 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
dd8c0d95 2110 if (conn->hdrdgst_en)
5bb0b55a 2111 tcp_conn->hdr_size += sizeof(__u32);
7ba24713
AA		 2112 break;
2113 case ISCSI_PARAM_DATADGST_EN:
5c75b7fc 2114 iscsi_set_param(cls_conn, param, buf, buflen);
5bb0b55a
MC		 2115 tcp_conn->sendpage = conn->datadgst_en ?
2116 sock_no_sendpage : tcp_conn->sock->ops->sendpage;
7ba24713 2117 break;
7ba24713 2118 case ISCSI_PARAM_MAX_R2T:
5c75b7fc 2119 sscanf(buf, "%d", &value);
7ba24713
AA		 2120 if (session->max_r2t == roundup_pow_of_two(value))
2121 break;
2122 iscsi_r2tpool_free(session);
5c75b7fc 2123 iscsi_set_param(cls_conn, param, buf, buflen);
7ba24713
AA		 2124 if (session->max_r2t & (session->max_r2t - 1))
2125 session->max_r2t = roundup_pow_of_two(session->max_r2t);
2126 if (iscsi_r2tpool_alloc(session))
2127 return -ENOMEM;
2128 break;
7ba24713 2129 default:
5c75b7fc 2130 return iscsi_set_param(cls_conn, param, buf, buflen);
7ba24713
AA		 2131 }
2132
2133 return 0;
2134}
2135
2136static int
5c75b7fc
MC		 2137iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
2138 enum iscsi_param param, char *buf)
7b8631b5 2139{
7b7232f3 2140 struct iscsi_conn *conn = cls_conn->dd_data;
5c75b7fc 2141 int len;
7b8631b5
MC		 2142
2143 switch(param) {
fd7255f5 2144 case ISCSI_PARAM_CONN_PORT:
22236961
MC		 2145 spin_lock_bh(&conn->session->lock);
2146 len = sprintf(buf, "%hu\n", conn->portal_port);
2147 spin_unlock_bh(&conn->session->lock);
8d2860b3 2148 break;
fd7255f5 2149 case ISCSI_PARAM_CONN_ADDRESS:
22236961
MC		 2150 spin_lock_bh(&conn->session->lock);
2151 len = sprintf(buf, "%s\n", conn->portal_address);
2152 spin_unlock_bh(&conn->session->lock);
fd7255f5
MC		 2153 break;
2154 default:
5c75b7fc 2155 return iscsi_conn_get_param(cls_conn, param, buf);
fd7255f5
MC		 2156 }
2157
2158 return len;
2159}
2160
22236961
MC		 2161static int
2162iscsi_tcp_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2163 char *buf)
2164{
2165 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2166 int len;
2167
2168 switch (param) {
2169 case ISCSI_HOST_PARAM_IPADDRESS:
2170 spin_lock_bh(&session->lock);
2171 if (!session->leadconn)
2172 len = -ENODEV;
2173 else
2174 len = sprintf(buf, "%s\n",
2175 session->leadconn->local_address);
2176 spin_unlock_bh(&session->lock);
2177 break;
2178 default:
2179 return iscsi_host_get_param(shost, param, buf);
2180 }
2181 return len;
2182}
2183
7ba24713 2184static void
7b7232f3 2185iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
7ba24713 2186{
7b7232f3 2187 struct iscsi_conn *conn = cls_conn->dd_data;
5bb0b55a 2188 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
7ba24713
AA		 2189
2190 stats->txdata_octets = conn->txdata_octets;
2191 stats->rxdata_octets = conn->rxdata_octets;
2192 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2193 stats->dataout_pdus = conn->dataout_pdus_cnt;
2194 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2195 stats->datain_pdus = conn->datain_pdus_cnt;
2196 stats->r2t_pdus = conn->r2t_pdus_cnt;
2197 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2198 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2199 stats->custom_length = 3;
2200 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
5bb0b55a 2201 stats->custom[0].value = tcp_conn->sendpage_failures_cnt;
7ba24713 2202 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
5bb0b55a 2203 stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt;
7ba24713
AA		 2204 strcpy(stats->custom[2].desc, "eh_abort_cnt");
2205 stats->custom[2].value = conn->eh_abort_cnt;
2206}
2207
5bb0b55a
MC		 2208static struct iscsi_cls_session *
2209iscsi_tcp_session_create(struct iscsi_transport *iscsit,
2210 struct scsi_transport_template *scsit,
1548271e 2211 uint16_t cmds_max, uint16_t qdepth,
5bb0b55a 2212 uint32_t initial_cmdsn, uint32_t *hostno)
7ba24713 2213{
5bb0b55a
MC		 2214 struct iscsi_cls_session *cls_session;
2215 struct iscsi_session *session;
2216 uint32_t hn;
2217 int cmd_i;
7ba24713 2218
1548271e 2219 cls_session = iscsi_session_setup(iscsit, scsit, cmds_max, qdepth,
5bb0b55a
MC		 2220 sizeof(struct iscsi_tcp_cmd_task),
2221 sizeof(struct iscsi_tcp_mgmt_task),
2222 initial_cmdsn, &hn);
2223 if (!cls_session)
2224 return NULL;
2225 *hostno = hn;
7ba24713 2226
5bb0b55a
MC		 2227 session = class_to_transport_session(cls_session);
2228 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2229 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
2230 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2231
2232 ctask->hdr = &tcp_ctask->hdr;
2233 }
2234
2235 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
2236 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
2237 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
2238
2239 mtask->hdr = &tcp_mtask->hdr;
2240 }
2241
2242 if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
2243 goto r2tpool_alloc_fail;
2244
2245 return cls_session;
2246
2247r2tpool_alloc_fail:
2248 iscsi_session_teardown(cls_session);
2249 return NULL;
2250}
2251
2252static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
2253{
5bb0b55a
MC		 2254 iscsi_r2tpool_free(class_to_transport_session(cls_session));
2255 iscsi_session_teardown(cls_session);
7ba24713
AA		 2256}
2257
d1d81c01
MC		 2258static int iscsi_tcp_slave_configure(struct scsi_device *sdev)
2259{
2260 blk_queue_dma_alignment(sdev->request_queue, 0);
2261 return 0;
2262}
2263
5bb0b55a 2264static struct scsi_host_template iscsi_sht = {
f4246b33 2265 .name = "iSCSI Initiator over TCP/IP",
5bb0b55a
MC		 2266 .queuecommand = iscsi_queuecommand,
2267 .change_queue_depth = iscsi_change_queue_depth,
1548271e 2268 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
5bb0b55a 2269 .sg_tablesize = ISCSI_SG_TABLESIZE,
8231f0ed 2270 .max_sectors = 0xFFFF,
5bb0b55a
MC		 2271 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
2272 .eh_abort_handler = iscsi_eh_abort,
2273 .eh_host_reset_handler = iscsi_eh_host_reset,
2274 .use_clustering = DISABLE_CLUSTERING,
d1d81c01 2275 .slave_configure = iscsi_tcp_slave_configure,
5bb0b55a
MC		 2276 .proc_name = "iscsi_tcp",
2277 .this_id = -1,
2278};
2279
7ba24713
AA		 2280static struct iscsi_transport iscsi_tcp_transport = {
2281 .owner = THIS_MODULE,
2282 .name = "tcp",
2283 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
2284 | CAP_DATADGST,
fd7255f5
MC		 2285 .param_mask = ISCSI_MAX_RECV_DLENGTH |
2286 ISCSI_MAX_XMIT_DLENGTH |
2287 ISCSI_HDRDGST_EN |
2288 ISCSI_DATADGST_EN |
2289 ISCSI_INITIAL_R2T_EN |
2290 ISCSI_MAX_R2T |
2291 ISCSI_IMM_DATA_EN |
2292 ISCSI_FIRST_BURST |
2293 ISCSI_MAX_BURST |
2294 ISCSI_PDU_INORDER_EN |
2295 ISCSI_DATASEQ_INORDER_EN |
2296 ISCSI_ERL |
2297 ISCSI_CONN_PORT |
8d2860b3 2298 ISCSI_CONN_ADDRESS |
5c75b7fc
MC		 2299 ISCSI_EXP_STATSN |
2300 ISCSI_PERSISTENT_PORT |
2301 ISCSI_PERSISTENT_ADDRESS |
b2c64167
MC		 2302 ISCSI_TARGET_NAME | ISCSI_TPGT |
2303 ISCSI_USERNAME | ISCSI_PASSWORD |
2304 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN,
22236961 2305 .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
8ad5781a 2306 ISCSI_HOST_INITIATOR_NAME,
7ba24713 2307 .host_template = &iscsi_sht,
7b8631b5 2308 .conndata_size = sizeof(struct iscsi_conn),
7ba24713
AA		 2309 .max_conn = 1,
2310 .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
5bb0b55a
MC		 2311 /* session management */
2312 .create_session = iscsi_tcp_session_create,
2313 .destroy_session = iscsi_tcp_session_destroy,
2314 /* connection management */
2315 .create_conn = iscsi_tcp_conn_create,
2316 .bind_conn = iscsi_tcp_conn_bind,
2317 .destroy_conn = iscsi_tcp_conn_destroy,
7ba24713 2318 .set_param = iscsi_conn_set_param,
5c75b7fc 2319 .get_conn_param = iscsi_tcp_conn_get_param,
7b8631b5 2320 .get_session_param = iscsi_session_get_param,
7ba24713 2321 .start_conn = iscsi_conn_start,
1c83469d 2322 .stop_conn = iscsi_tcp_conn_stop,
0801c242 2323 /* iscsi host params */
22236961 2324 .get_host_param = iscsi_tcp_host_get_param,
0801c242 2325 .set_host_param = iscsi_host_set_param,
5bb0b55a 2326 /* IO */
7ba24713
AA		 2327 .send_pdu = iscsi_conn_send_pdu,
2328 .get_stats = iscsi_conn_get_stats,
5bb0b55a
MC		 2329 .init_cmd_task = iscsi_tcp_cmd_init,
2330 .init_mgmt_task = iscsi_tcp_mgmt_init,
2331 .xmit_cmd_task = iscsi_tcp_ctask_xmit,
2332 .xmit_mgmt_task = iscsi_tcp_mtask_xmit,
2333 .cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
2334 /* recovery */
30a6c652 2335 .session_recovery_timedout = iscsi_session_recovery_timedout,
7ba24713
AA		 2336};
2337
2338static int __init
2339iscsi_tcp_init(void)
2340{
7ba24713 2341 if (iscsi_max_lun < 1) {
be2df72e
OG		 2342 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
2343 iscsi_max_lun);
7ba24713
AA		 2344 return -EINVAL;
2345 }
2346 iscsi_tcp_transport.max_lun = iscsi_max_lun;
2347
7b8631b5 2348 if (!iscsi_register_transport(&iscsi_tcp_transport))
ffbfe925 2349 return -ENODEV;
7ba24713 2350
7b8631b5 2351 return 0;
7ba24713
AA		 2352}
2353
2354static void __exit
2355iscsi_tcp_exit(void)
2356{
2357 iscsi_unregister_transport(&iscsi_tcp_transport);
7ba24713
AA		 2358}
2359
2360module_init(iscsi_tcp_init);
2361module_exit(iscsi_tcp_exit);
Linux 6.x block layer and io_uring tree(s)