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Alex Aizman7ba24712005-08-04 19:30:08 -07001/*
2 * iSCSI Initiator over TCP/IP Data-Path
3 *
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
Mike Christie5bb0b552006-04-06 21:26:46 -05006 * Copyright (C) 2005 - 2006 Mike Christie
7 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
Alex Aizman7ba24712005-08-04 19:30:08 -07008 * 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>
32#include <linux/blkdev.h>
33#include <linux/crypto.h>
34#include <linux/delay.h>
35#include <linux/kfifo.h>
36#include <linux/scatterlist.h>
Arjan van de Ven0b950672006-01-11 13:16:10 +010037#include <linux/mutex.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070038#include <net/tcp.h>
39#include <scsi/scsi_cmnd.h>
Alex Aizman7ba24712005-08-04 19:30:08 -070040#include <scsi/scsi_host.h>
41#include <scsi/scsi.h>
42#include <scsi/scsi_transport_iscsi.h>
43
44#include "iscsi_tcp.h"
45
46MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
47 "Alex Aizman <itn780@yahoo.com>");
48MODULE_DESCRIPTION("iSCSI/TCP data-path");
49MODULE_LICENSE("GPL");
Alex Aizman7ba24712005-08-04 19:30:08 -070050/* #define DEBUG_TCP */
Alex Aizman7ba24712005-08-04 19:30:08 -070051#define DEBUG_ASSERT
52
53#ifdef DEBUG_TCP
Mike Christie5bb0b552006-04-06 21:26:46 -050054#define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)
Alex Aizman7ba24712005-08-04 19:30:08 -070055#else
56#define debug_tcp(fmt...)
57#endif
58
Alex Aizman7ba24712005-08-04 19:30:08 -070059#ifndef DEBUG_ASSERT
60#ifdef BUG_ON
61#undef BUG_ON
62#endif
63#define BUG_ON(expr)
64#endif
65
Alex Aizman7ba24712005-08-04 19:30:08 -070066static unsigned int iscsi_max_lun = 512;
67module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
68
Alex Aizman7ba24712005-08-04 19:30:08 -070069static inline void
Alex Aizman7ba24712005-08-04 19:30:08 -070070iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
71{
Mike Christie7cae5152006-01-13 18:05:47 -060072 ibuf->sg.page = virt_to_page(vbuf);
73 ibuf->sg.offset = offset_in_page(vbuf);
Alex Aizman7ba24712005-08-04 19:30:08 -070074 ibuf->sg.length = size;
75 ibuf->sent = 0;
Mike Christie7cae5152006-01-13 18:05:47 -060076 ibuf->use_sendmsg = 1;
Alex Aizman7ba24712005-08-04 19:30:08 -070077}
78
79static inline void
80iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
81{
Mike Christie7cae5152006-01-13 18:05:47 -060082 ibuf->sg.page = sg->page;
83 ibuf->sg.offset = sg->offset;
84 ibuf->sg.length = sg->length;
Alex Aizman7ba24712005-08-04 19:30:08 -070085 /*
86 * Fastpath: sg element fits into single page
87 */
Mike Christiea1e80c22006-01-13 18:05:56 -060088 if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page))
Mike Christie7cae5152006-01-13 18:05:47 -060089 ibuf->use_sendmsg = 0;
90 else
91 ibuf->use_sendmsg = 1;
Alex Aizman7ba24712005-08-04 19:30:08 -070092 ibuf->sent = 0;
93}
94
95static inline int
96iscsi_buf_left(struct iscsi_buf *ibuf)
97{
98 int rc;
99
100 rc = ibuf->sg.length - ibuf->sent;
101 BUG_ON(rc < 0);
102 return rc;
103}
104
105static inline void
Mike Christieaf973482005-09-12 21:01:32 -0500106iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
107 u8* crc)
Alex Aizman7ba24712005-08-04 19:30:08 -0700108{
Mike Christie5bb0b552006-04-06 21:26:46 -0500109 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
110
James Bottomleyc9802cd2006-09-23 15:33:43 -0500111 crypto_hash_digest(&tcp_conn->tx_hash, &buf->sg, buf->sg.length, crc);
Mike Christie753e7d32006-08-31 18:09:29 -0400112 buf->sg.length = tcp_conn->hdr_size;
Alex Aizman7ba24712005-08-04 19:30:08 -0700113}
114
Alex Aizman7ba24712005-08-04 19:30:08 -0700115static inline int
Mike Christie5bb0b552006-04-06 21:26:46 -0500116iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700117{
Mike Christie5bb0b552006-04-06 21:26:46 -0500118 struct sk_buff *skb = tcp_conn->in.skb;
Alex Aizman7ba24712005-08-04 19:30:08 -0700119
Mike Christie5bb0b552006-04-06 21:26:46 -0500120 tcp_conn->in.zero_copy_hdr = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700121
Mike Christie5bb0b552006-04-06 21:26:46 -0500122 if (tcp_conn->in.copy >= tcp_conn->hdr_size &&
123 tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700124 /*
125 * Zero-copy PDU Header: using connection context
126 * to store header pointer.
127 */
128 if (skb_shinfo(skb)->frag_list == NULL &&
Mike Christie5bb0b552006-04-06 21:26:46 -0500129 !skb_shinfo(skb)->nr_frags) {
130 tcp_conn->in.hdr = (struct iscsi_hdr *)
131 ((char*)skb->data + tcp_conn->in.offset);
132 tcp_conn->in.zero_copy_hdr = 1;
133 } else {
Alex Aizman7ba24712005-08-04 19:30:08 -0700134 /* ignoring return code since we checked
135 * in.copy before */
Mike Christie5bb0b552006-04-06 21:26:46 -0500136 skb_copy_bits(skb, tcp_conn->in.offset,
137 &tcp_conn->hdr, tcp_conn->hdr_size);
138 tcp_conn->in.hdr = &tcp_conn->hdr;
Alex Aizman7ba24712005-08-04 19:30:08 -0700139 }
Mike Christie5bb0b552006-04-06 21:26:46 -0500140 tcp_conn->in.offset += tcp_conn->hdr_size;
141 tcp_conn->in.copy -= tcp_conn->hdr_size;
Alex Aizman7ba24712005-08-04 19:30:08 -0700142 } else {
143 int hdr_remains;
144 int copylen;
145
146 /*
147 * PDU header scattered across SKB's,
148 * copying it... This'll happen quite rarely.
149 */
150
Mike Christie5bb0b552006-04-06 21:26:46 -0500151 if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER)
152 tcp_conn->in.hdr_offset = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700153
Mike Christie5bb0b552006-04-06 21:26:46 -0500154 hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset;
Alex Aizman7ba24712005-08-04 19:30:08 -0700155 BUG_ON(hdr_remains <= 0);
156
Mike Christie5bb0b552006-04-06 21:26:46 -0500157 copylen = min(tcp_conn->in.copy, hdr_remains);
158 skb_copy_bits(skb, tcp_conn->in.offset,
159 (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset,
160 copylen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700161
162 debug_tcp("PDU gather offset %d bytes %d in.offset %d "
Mike Christie5bb0b552006-04-06 21:26:46 -0500163 "in.copy %d\n", tcp_conn->in.hdr_offset, copylen,
164 tcp_conn->in.offset, tcp_conn->in.copy);
Alex Aizman7ba24712005-08-04 19:30:08 -0700165
Mike Christie5bb0b552006-04-06 21:26:46 -0500166 tcp_conn->in.offset += copylen;
167 tcp_conn->in.copy -= copylen;
Alex Aizman7ba24712005-08-04 19:30:08 -0700168 if (copylen < hdr_remains) {
Mike Christie5bb0b552006-04-06 21:26:46 -0500169 tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER;
170 tcp_conn->in.hdr_offset += copylen;
Alex Aizman7ba24712005-08-04 19:30:08 -0700171 return -EAGAIN;
172 }
Mike Christie5bb0b552006-04-06 21:26:46 -0500173 tcp_conn->in.hdr = &tcp_conn->hdr;
174 tcp_conn->discontiguous_hdr_cnt++;
175 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
Alex Aizman7ba24712005-08-04 19:30:08 -0700176 }
177
178 return 0;
179}
180
Mike Christie30a6c652006-04-06 21:13:39 -0500181/*
182 * must be called with session lock
183 */
184static void
Mike Christieb6c395e2006-07-24 15:47:15 -0500185iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
Alex Aizman7ba24712005-08-04 19:30:08 -0700186{
Mike Christie5bb0b552006-04-06 21:26:46 -0500187 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
Mike Christieb6c395e2006-07-24 15:47:15 -0500188 struct iscsi_r2t_info *r2t;
Mike Christie30a6c652006-04-06 21:13:39 -0500189 struct scsi_cmnd *sc;
Alex Aizman7ba24712005-08-04 19:30:08 -0700190
Mike Christieb6c395e2006-07-24 15:47:15 -0500191 /* flush ctask's r2t queues */
192 while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
193 __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
194 sizeof(void*));
195 debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n");
196 }
197
Mike Christie30a6c652006-04-06 21:13:39 -0500198 sc = ctask->sc;
199 if (unlikely(!sc))
Alex Aizman7ba24712005-08-04 19:30:08 -0700200 return;
Mike Christie30a6c652006-04-06 21:13:39 -0500201
Mike Christie5bb0b552006-04-06 21:26:46 -0500202 tcp_ctask->xmstate = XMSTATE_IDLE;
203 tcp_ctask->r2t = NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -0700204}
205
206/**
207 * iscsi_data_rsp - SCSI Data-In Response processing
208 * @conn: iscsi connection
209 * @ctask: scsi command task
210 **/
211static int
212iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
213{
214 int rc;
Mike Christie5bb0b552006-04-06 21:26:46 -0500215 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;
Alex Aizman7ba24712005-08-04 19:30:08 -0700218 struct iscsi_session *session = conn->session;
219 int datasn = be32_to_cpu(rhdr->datasn);
220
221 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
222 if (rc)
223 return rc;
224 /*
225 * setup Data-In byte counter (gets decremented..)
226 */
Mike Christie5bb0b552006-04-06 21:26:46 -0500227 ctask->data_count = tcp_conn->in.datalen;
Alex Aizman7ba24712005-08-04 19:30:08 -0700228
Mike Christie5bb0b552006-04-06 21:26:46 -0500229 if (tcp_conn->in.datalen == 0)
Alex Aizman7ba24712005-08-04 19:30:08 -0700230 return 0;
231
232 if (ctask->datasn != datasn)
233 return ISCSI_ERR_DATASN;
234
235 ctask->datasn++;
236
Mike Christie5bb0b552006-04-06 21:26:46 -0500237 tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
238 if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length)
Alex Aizman7ba24712005-08-04 19:30:08 -0700239 return ISCSI_ERR_DATA_OFFSET;
240
241 if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
242 struct scsi_cmnd *sc = ctask->sc;
243
244 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
zhenyu.z.wang@intel.combf310b82006-01-13 18:05:38 -0600245 if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700246 int res_count = be32_to_cpu(rhdr->residual_count);
247
248 if (res_count > 0 &&
249 res_count <= sc->request_bufflen) {
250 sc->resid = res_count;
251 sc->result = (DID_OK << 16) | rhdr->cmd_status;
252 } else
253 sc->result = (DID_BAD_TARGET << 16) |
254 rhdr->cmd_status;
zhenyu.z.wang@intel.combf310b82006-01-13 18:05:38 -0600255 } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700256 sc->resid = be32_to_cpu(rhdr->residual_count);
257 sc->result = (DID_OK << 16) | rhdr->cmd_status;
258 } else
259 sc->result = (DID_OK << 16) | rhdr->cmd_status;
260 }
261
262 conn->datain_pdus_cnt++;
263 return 0;
264}
265
266/**
267 * iscsi_solicit_data_init - initialize first Data-Out
268 * @conn: iscsi connection
269 * @ctask: scsi command task
270 * @r2t: R2T info
271 *
272 * Notes:
273 * Initialize first Data-Out within this R2T sequence and finds
274 * proper data_offset within this SCSI command.
275 *
276 * This function is called with connection lock taken.
277 **/
278static void
279iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
280 struct iscsi_r2t_info *r2t)
281{
282 struct iscsi_data *hdr;
Alex Aizman7ba24712005-08-04 19:30:08 -0700283 struct scsi_cmnd *sc = ctask->sc;
284
Mike Christieffbfe922006-05-18 20:31:36 -0500285 hdr = &r2t->dtask.hdr;
Alex Aizman7ba24712005-08-04 19:30:08 -0700286 memset(hdr, 0, sizeof(struct iscsi_data));
287 hdr->ttt = r2t->ttt;
288 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
289 r2t->solicit_datasn++;
290 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
Mike Christie5bb0b552006-04-06 21:26:46 -0500291 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
292 hdr->itt = ctask->hdr->itt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700293 hdr->exp_statsn = r2t->exp_statsn;
294 hdr->offset = cpu_to_be32(r2t->data_offset);
295 if (r2t->data_length > conn->max_xmit_dlength) {
296 hton24(hdr->dlength, conn->max_xmit_dlength);
297 r2t->data_count = conn->max_xmit_dlength;
298 hdr->flags = 0;
299 } else {
300 hton24(hdr->dlength, r2t->data_length);
301 r2t->data_count = r2t->data_length;
302 hdr->flags = ISCSI_FLAG_CMD_FINAL;
303 }
304 conn->dataout_pdus_cnt++;
305
306 r2t->sent = 0;
307
Mike Christie6e458cc2006-05-18 20:31:31 -0500308 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
Mike Christieaf973482005-09-12 21:01:32 -0500309 sizeof(struct iscsi_hdr));
Alex Aizman7ba24712005-08-04 19:30:08 -0700310
Alex Aizman7ba24712005-08-04 19:30:08 -0700311 if (sc->use_sg) {
312 int i, sg_count = 0;
313 struct scatterlist *sg = sc->request_buffer;
314
315 r2t->sg = NULL;
316 for (i = 0; i < sc->use_sg; i++, sg += 1) {
317 /* FIXME: prefetch ? */
318 if (sg_count + sg->length > r2t->data_offset) {
319 int page_offset;
320
321 /* sg page found! */
322
323 /* offset within this page */
324 page_offset = r2t->data_offset - sg_count;
325
326 /* fill in this buffer */
327 iscsi_buf_init_sg(&r2t->sendbuf, sg);
328 r2t->sendbuf.sg.offset += page_offset;
329 r2t->sendbuf.sg.length -= page_offset;
330
331 /* xmit logic will continue with next one */
332 r2t->sg = sg + 1;
333 break;
334 }
335 sg_count += sg->length;
336 }
337 BUG_ON(r2t->sg == NULL);
Mike Christie62f38302006-08-31 18:09:27 -0400338 } else {
339 iscsi_buf_init_iov(&r2t->sendbuf,
Alex Aizman7ba24712005-08-04 19:30:08 -0700340 (char*)sc->request_buffer + r2t->data_offset,
341 r2t->data_count);
Mike Christie62f38302006-08-31 18:09:27 -0400342 r2t->sg = NULL;
343 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700344}
345
346/**
347 * iscsi_r2t_rsp - iSCSI R2T Response processing
348 * @conn: iscsi connection
349 * @ctask: scsi command task
350 **/
351static int
352iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
353{
354 struct iscsi_r2t_info *r2t;
355 struct iscsi_session *session = conn->session;
Mike Christie5bb0b552006-04-06 21:26:46 -0500356 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
357 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
358 struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
Alex Aizman7ba24712005-08-04 19:30:08 -0700359 int r2tsn = be32_to_cpu(rhdr->r2tsn);
360 int rc;
361
Mike Christie98a94162006-08-31 18:09:26 -0400362 if (tcp_conn->in.datalen) {
363 printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n",
364 tcp_conn->in.datalen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700365 return ISCSI_ERR_DATALEN;
Mike Christie98a94162006-08-31 18:09:26 -0400366 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700367
Mike Christie5bb0b552006-04-06 21:26:46 -0500368 if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700369 return ISCSI_ERR_R2TSN;
370
371 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
372 if (rc)
373 return rc;
374
375 /* FIXME: use R2TSN to detect missing R2T */
376
377 /* fill-in new R2T associated with the task */
378 spin_lock(&session->lock);
379 if (!ctask->sc || ctask->mtask ||
380 session->state != ISCSI_STATE_LOGGED_IN) {
381 printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
382 "recovery...\n", ctask->itt);
383 spin_unlock(&session->lock);
384 return 0;
385 }
Mike Christieb6c395e2006-07-24 15:47:15 -0500386
Mike Christie5bb0b552006-04-06 21:26:46 -0500387 rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
Alex Aizman7ba24712005-08-04 19:30:08 -0700388 BUG_ON(!rc);
389
390 r2t->exp_statsn = rhdr->statsn;
391 r2t->data_length = be32_to_cpu(rhdr->data_length);
Mike Christie98a94162006-08-31 18:09:26 -0400392 if (r2t->data_length == 0) {
393 printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n");
Alex Aizman7ba24712005-08-04 19:30:08 -0700394 spin_unlock(&session->lock);
395 return ISCSI_ERR_DATALEN;
396 }
397
Mike Christie98a94162006-08-31 18:09:26 -0400398 if (r2t->data_length > session->max_burst)
399 debug_scsi("invalid R2T with data len %u and max burst %u."
400 "Attempting to execute request.\n",
401 r2t->data_length, session->max_burst);
402
Alex Aizman7ba24712005-08-04 19:30:08 -0700403 r2t->data_offset = be32_to_cpu(rhdr->data_offset);
404 if (r2t->data_offset + r2t->data_length > ctask->total_length) {
405 spin_unlock(&session->lock);
Mike Christie98a94162006-08-31 18:09:26 -0400406 printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at "
407 "offset %u and total length %d\n", r2t->data_length,
408 r2t->data_offset, ctask->total_length);
Alex Aizman7ba24712005-08-04 19:30:08 -0700409 return ISCSI_ERR_DATALEN;
410 }
411
412 r2t->ttt = rhdr->ttt; /* no flip */
413 r2t->solicit_datasn = 0;
414
415 iscsi_solicit_data_init(conn, ctask, r2t);
416
Mike Christie5bb0b552006-04-06 21:26:46 -0500417 tcp_ctask->exp_r2tsn = r2tsn + 1;
418 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
419 __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
Mike Christieb6c395e2006-07-24 15:47:15 -0500420 list_move_tail(&ctask->running, &conn->xmitqueue);
Alex Aizman7ba24712005-08-04 19:30:08 -0700421
Mike Christie55e32992006-01-13 18:05:53 -0600422 scsi_queue_work(session->host, &conn->xmitwork);
Alex Aizman7ba24712005-08-04 19:30:08 -0700423 conn->r2t_pdus_cnt++;
424 spin_unlock(&session->lock);
425
426 return 0;
427}
428
429static int
Mike Christie5bb0b552006-04-06 21:26:46 -0500430iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
Alex Aizman7ba24712005-08-04 19:30:08 -0700431{
Mike Christie5bb0b552006-04-06 21:26:46 -0500432 int rc = 0, opcode, ahslen;
Alex Aizman7ba24712005-08-04 19:30:08 -0700433 struct iscsi_hdr *hdr;
Alex Aizman7ba24712005-08-04 19:30:08 -0700434 struct iscsi_session *session = conn->session;
Mike Christie5bb0b552006-04-06 21:26:46 -0500435 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
436 uint32_t cdgst, rdgst = 0, itt;
Alex Aizman7ba24712005-08-04 19:30:08 -0700437
Mike Christie5bb0b552006-04-06 21:26:46 -0500438 hdr = tcp_conn->in.hdr;
Alex Aizman7ba24712005-08-04 19:30:08 -0700439
440 /* verify PDU length */
Mike Christie5bb0b552006-04-06 21:26:46 -0500441 tcp_conn->in.datalen = ntoh24(hdr->dlength);
442 if (tcp_conn->in.datalen > conn->max_recv_dlength) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700443 printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
Mike Christie5bb0b552006-04-06 21:26:46 -0500444 tcp_conn->in.datalen, conn->max_recv_dlength);
Alex Aizman7ba24712005-08-04 19:30:08 -0700445 return ISCSI_ERR_DATALEN;
446 }
Mike Christie5bb0b552006-04-06 21:26:46 -0500447 tcp_conn->data_copied = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700448
449 /* read AHS */
Mike Christie5bb0b552006-04-06 21:26:46 -0500450 ahslen = hdr->hlength << 2;
451 tcp_conn->in.offset += ahslen;
452 tcp_conn->in.copy -= ahslen;
453 if (tcp_conn->in.copy < 0) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700454 printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
Mike Christie5bb0b552006-04-06 21:26:46 -0500455 "%d bytes\n", ahslen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700456 return ISCSI_ERR_AHSLEN;
457 }
458
459 /* calculate read padding */
Mike Christie5bb0b552006-04-06 21:26:46 -0500460 tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1);
461 if (tcp_conn->in.padding) {
462 tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding;
463 debug_scsi("read padding %d bytes\n", tcp_conn->in.padding);
Alex Aizman7ba24712005-08-04 19:30:08 -0700464 }
465
466 if (conn->hdrdgst_en) {
467 struct scatterlist sg;
468
469 sg_init_one(&sg, (u8 *)hdr,
Mike Christie5bb0b552006-04-06 21:26:46 -0500470 sizeof(struct iscsi_hdr) + ahslen);
James Bottomleyc9802cd2006-09-23 15:33:43 -0500471 crypto_hash_digest(&tcp_conn->rx_hash, &sg, sg.length,
472 (u8 *)&cdgst);
Alex Aizman7ba24712005-08-04 19:30:08 -0700473 rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
Mike Christie5bb0b552006-04-06 21:26:46 -0500474 ahslen);
Mike Christie8a47cd32005-11-30 02:27:19 -0600475 if (cdgst != rdgst) {
Mike Christie5bb0b552006-04-06 21:26:46 -0500476 printk(KERN_ERR "iscsi_tcp: hdrdgst error "
477 "recv 0x%x calc 0x%x\n", rdgst, cdgst);
Mike Christie8a47cd32005-11-30 02:27:19 -0600478 return ISCSI_ERR_HDR_DGST;
479 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700480 }
481
Mike Christie5bb0b552006-04-06 21:26:46 -0500482 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
Alex Aizman7ba24712005-08-04 19:30:08 -0700483 /* verify itt (itt encoding: age+cid+itt) */
Mike Christie5bb0b552006-04-06 21:26:46 -0500484 rc = iscsi_verify_itt(conn, hdr, &itt);
485 if (rc == ISCSI_ERR_NO_SCSI_CMD) {
486 tcp_conn->in.datalen = 0; /* force drop */
487 return 0;
488 } else if (rc)
489 return rc;
Alex Aizman7ba24712005-08-04 19:30:08 -0700490
491 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
Mike Christie5bb0b552006-04-06 21:26:46 -0500492 opcode, tcp_conn->in.offset, tcp_conn->in.copy,
493 ahslen, tcp_conn->in.datalen);
Alex Aizman7ba24712005-08-04 19:30:08 -0700494
Mike Christie5bb0b552006-04-06 21:26:46 -0500495 switch(opcode) {
496 case ISCSI_OP_SCSI_DATA_IN:
497 tcp_conn->in.ctask = session->cmds[itt];
498 rc = iscsi_data_rsp(conn, tcp_conn->in.ctask);
Mike Christie275fd7d2006-07-24 15:47:17 -0500499 if (rc)
500 return rc;
Mike Christie5bb0b552006-04-06 21:26:46 -0500501 /* fall through */
502 case ISCSI_OP_SCSI_CMD_RSP:
503 tcp_conn->in.ctask = session->cmds[itt];
504 if (tcp_conn->in.datalen)
505 goto copy_hdr;
Alex Aizman7ba24712005-08-04 19:30:08 -0700506
Mike Christie5bb0b552006-04-06 21:26:46 -0500507 spin_lock(&session->lock);
Mike Christie5bb0b552006-04-06 21:26:46 -0500508 rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
509 spin_unlock(&session->lock);
510 break;
511 case ISCSI_OP_R2T:
512 tcp_conn->in.ctask = session->cmds[itt];
513 if (ahslen)
514 rc = ISCSI_ERR_AHSLEN;
515 else if (tcp_conn->in.ctask->sc->sc_data_direction ==
516 DMA_TO_DEVICE)
517 rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask);
518 else
519 rc = ISCSI_ERR_PROTO;
520 break;
521 case ISCSI_OP_LOGIN_RSP:
522 case ISCSI_OP_TEXT_RSP:
Mike Christie5bb0b552006-04-06 21:26:46 -0500523 case ISCSI_OP_REJECT:
524 case ISCSI_OP_ASYNC_EVENT:
Mike Christiec8dc1e52006-07-24 15:47:39 -0500525 /*
526 * It is possible that we could get a PDU with a buffer larger
527 * than 8K, but there are no targets that currently do this.
528 * For now we fail until we find a vendor that needs it
529 */
530 if (DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH <
531 tcp_conn->in.datalen) {
532 printk(KERN_ERR "iscsi_tcp: received buffer of len %u "
533 "but conn buffer is only %u (opcode %0x)\n",
534 tcp_conn->in.datalen,
535 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, opcode);
536 rc = ISCSI_ERR_PROTO;
537 break;
538 }
539
Mike Christie5bb0b552006-04-06 21:26:46 -0500540 if (tcp_conn->in.datalen)
541 goto copy_hdr;
542 /* fall through */
Mike Christiec8dc1e52006-07-24 15:47:39 -0500543 case ISCSI_OP_LOGOUT_RSP:
544 case ISCSI_OP_NOOP_IN:
Mike Christie5bb0b552006-04-06 21:26:46 -0500545 case ISCSI_OP_SCSI_TMFUNC_RSP:
546 rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
547 break;
548 default:
549 rc = ISCSI_ERR_BAD_OPCODE;
550 break;
551 }
Alex Aizman7ba24712005-08-04 19:30:08 -0700552
553 return rc;
Mike Christie5bb0b552006-04-06 21:26:46 -0500554
555copy_hdr:
556 /*
557 * if we did zero copy for the header but we will need multiple
558 * skbs to complete the command then we have to copy the header
559 * for later use
560 */
Mike Christie275fd7d2006-07-24 15:47:17 -0500561 if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <=
Mike Christie5bb0b552006-04-06 21:26:46 -0500562 (tcp_conn->in.datalen + tcp_conn->in.padding +
563 (conn->datadgst_en ? 4 : 0))) {
564 debug_tcp("Copying header for later use. in.copy %d in.datalen"
565 " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen);
566 memcpy(&tcp_conn->hdr, tcp_conn->in.hdr,
567 sizeof(struct iscsi_hdr));
568 tcp_conn->in.hdr = &tcp_conn->hdr;
569 tcp_conn->in.zero_copy_hdr = 0;
570 }
571 return 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700572}
573
574/**
575 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
Mike Christie5bb0b552006-04-06 21:26:46 -0500576 * @conn: iscsi tcp connection
Alex Aizman7ba24712005-08-04 19:30:08 -0700577 * @ctask: scsi command task
578 * @buf: buffer to copy to
579 * @buf_size: size of buffer
580 * @offset: offset within the buffer
581 *
582 * Notes:
583 * The function calls skb_copy_bits() and updates per-connection and
584 * per-cmd byte counters.
585 *
586 * Read counters (in bytes):
587 *
588 * conn->in.offset offset within in progress SKB
589 * conn->in.copy left to copy from in progress SKB
590 * including padding
591 * conn->in.copied copied already from in progress SKB
592 * conn->data_copied copied already from in progress buffer
593 * ctask->sent total bytes sent up to the MidLayer
594 * ctask->data_count left to copy from in progress Data-In
595 * buf_left left to copy from in progress buffer
596 **/
597static inline int
Mike Christie5bb0b552006-04-06 21:26:46 -0500598iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
Alex Aizman7ba24712005-08-04 19:30:08 -0700599 void *buf, int buf_size, int offset)
600{
Mike Christie5bb0b552006-04-06 21:26:46 -0500601 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
602 int buf_left = buf_size - (tcp_conn->data_copied + offset);
603 int size = min(tcp_conn->in.copy, buf_left);
Alex Aizman7ba24712005-08-04 19:30:08 -0700604 int rc;
605
606 size = min(size, ctask->data_count);
607
608 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
Mike Christie5bb0b552006-04-06 21:26:46 -0500609 size, tcp_conn->in.offset, tcp_conn->in.copied);
Alex Aizman7ba24712005-08-04 19:30:08 -0700610
611 BUG_ON(size <= 0);
Mike Christie5bb0b552006-04-06 21:26:46 -0500612 BUG_ON(tcp_ctask->sent + size > ctask->total_length);
Alex Aizman7ba24712005-08-04 19:30:08 -0700613
Mike Christie5bb0b552006-04-06 21:26:46 -0500614 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
615 (char*)buf + (offset + tcp_conn->data_copied), size);
Alex Aizman7ba24712005-08-04 19:30:08 -0700616 /* must fit into skb->len */
617 BUG_ON(rc);
618
Mike Christie5bb0b552006-04-06 21:26:46 -0500619 tcp_conn->in.offset += size;
620 tcp_conn->in.copy -= size;
621 tcp_conn->in.copied += size;
622 tcp_conn->data_copied += size;
623 tcp_ctask->sent += size;
Alex Aizman7ba24712005-08-04 19:30:08 -0700624 ctask->data_count -= size;
625
Mike Christie5bb0b552006-04-06 21:26:46 -0500626 BUG_ON(tcp_conn->in.copy < 0);
Alex Aizman7ba24712005-08-04 19:30:08 -0700627 BUG_ON(ctask->data_count < 0);
628
Mike Christie5bb0b552006-04-06 21:26:46 -0500629 if (buf_size != (tcp_conn->data_copied + offset)) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700630 if (!ctask->data_count) {
Mike Christie5bb0b552006-04-06 21:26:46 -0500631 BUG_ON(buf_size - tcp_conn->data_copied < 0);
Alex Aizman7ba24712005-08-04 19:30:08 -0700632 /* done with this PDU */
Mike Christie5bb0b552006-04-06 21:26:46 -0500633 return buf_size - tcp_conn->data_copied;
Alex Aizman7ba24712005-08-04 19:30:08 -0700634 }
635 return -EAGAIN;
636 }
637
638 /* done with this buffer or with both - PDU and buffer */
Mike Christie5bb0b552006-04-06 21:26:46 -0500639 tcp_conn->data_copied = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700640 return 0;
641}
642
643/**
644 * iscsi_tcp_copy - copy skb bits to the destanation buffer
Mike Christie5bb0b552006-04-06 21:26:46 -0500645 * @conn: iscsi tcp connection
Alex Aizman7ba24712005-08-04 19:30:08 -0700646 *
647 * Notes:
648 * The function calls skb_copy_bits() and updates per-connection
649 * byte counters.
650 **/
651static inline int
Mike Christieca518682006-08-31 18:09:32 -0400652iscsi_tcp_copy(struct iscsi_conn *conn, int buf_size)
Alex Aizman7ba24712005-08-04 19:30:08 -0700653{
Mike Christiec8dc1e52006-07-24 15:47:39 -0500654 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500655 int buf_left = buf_size - tcp_conn->data_copied;
656 int size = min(tcp_conn->in.copy, buf_left);
Alex Aizman7ba24712005-08-04 19:30:08 -0700657 int rc;
658
659 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
Mike Christie5bb0b552006-04-06 21:26:46 -0500660 size, tcp_conn->in.offset, tcp_conn->data_copied);
Alex Aizman7ba24712005-08-04 19:30:08 -0700661 BUG_ON(size <= 0);
662
Mike Christie5bb0b552006-04-06 21:26:46 -0500663 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
Mike Christiec8dc1e52006-07-24 15:47:39 -0500664 (char*)conn->data + tcp_conn->data_copied, size);
Alex Aizman7ba24712005-08-04 19:30:08 -0700665 BUG_ON(rc);
666
Mike Christie5bb0b552006-04-06 21:26:46 -0500667 tcp_conn->in.offset += size;
668 tcp_conn->in.copy -= size;
669 tcp_conn->in.copied += size;
670 tcp_conn->data_copied += size;
Alex Aizman7ba24712005-08-04 19:30:08 -0700671
Mike Christie5bb0b552006-04-06 21:26:46 -0500672 if (buf_size != tcp_conn->data_copied)
Alex Aizman7ba24712005-08-04 19:30:08 -0700673 return -EAGAIN;
674
675 return 0;
676}
677
678static inline void
James Bottomleyc9802cd2006-09-23 15:33:43 -0500679partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg,
Mike Christie62f38302006-08-31 18:09:27 -0400680 int offset, int length)
Alex Aizman7ba24712005-08-04 19:30:08 -0700681{
682 struct scatterlist temp;
683
684 memcpy(&temp, sg, sizeof(struct scatterlist));
685 temp.offset = offset;
686 temp.length = length;
James Bottomleyc9802cd2006-09-23 15:33:43 -0500687 crypto_hash_update(desc, &temp, length);
Alex Aizman7ba24712005-08-04 19:30:08 -0700688}
689
Mike Christief6cfba12005-11-29 23:12:57 -0600690static void
Mike Christie5bb0b552006-04-06 21:26:46 -0500691iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len)
Mike Christief6cfba12005-11-29 23:12:57 -0600692{
693 struct scatterlist tmp;
694
695 sg_init_one(&tmp, buf, len);
James Bottomleyc9802cd2006-09-23 15:33:43 -0500696 crypto_hash_update(&tcp_conn->rx_hash, &tmp, len);
Mike Christief6cfba12005-11-29 23:12:57 -0600697}
698
Alex Aizman7ba24712005-08-04 19:30:08 -0700699static int iscsi_scsi_data_in(struct iscsi_conn *conn)
700{
Mike Christie5bb0b552006-04-06 21:26:46 -0500701 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
702 struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
703 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700704 struct scsi_cmnd *sc = ctask->sc;
Mike Christief6cfba12005-11-29 23:12:57 -0600705 struct scatterlist *sg;
Alex Aizman7ba24712005-08-04 19:30:08 -0700706 int i, offset, rc = 0;
707
708 BUG_ON((void*)ctask != sc->SCp.ptr);
709
710 /*
711 * copying Data-In into the Scsi_Cmnd
712 */
713 if (!sc->use_sg) {
714 i = ctask->data_count;
Mike Christie5bb0b552006-04-06 21:26:46 -0500715 rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer,
716 sc->request_bufflen,
717 tcp_ctask->data_offset);
Alex Aizman7ba24712005-08-04 19:30:08 -0700718 if (rc == -EAGAIN)
719 return rc;
FUJITA Tomonori42f72aa2006-01-13 18:05:35 -0600720 if (conn->datadgst_en)
Mike Christie5bb0b552006-04-06 21:26:46 -0500721 iscsi_recv_digest_update(tcp_conn, sc->request_buffer,
722 i);
Alex Aizman7ba24712005-08-04 19:30:08 -0700723 rc = 0;
724 goto done;
725 }
726
Mike Christie5bb0b552006-04-06 21:26:46 -0500727 offset = tcp_ctask->data_offset;
Alex Aizman7ba24712005-08-04 19:30:08 -0700728 sg = sc->request_buffer;
729
Mike Christie5bb0b552006-04-06 21:26:46 -0500730 if (tcp_ctask->data_offset)
731 for (i = 0; i < tcp_ctask->sg_count; i++)
Alex Aizman7ba24712005-08-04 19:30:08 -0700732 offset -= sg[i].length;
733 /* we've passed through partial sg*/
734 if (offset < 0)
735 offset = 0;
736
Mike Christie5bb0b552006-04-06 21:26:46 -0500737 for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700738 char *dest;
739
740 dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
Mike Christie5bb0b552006-04-06 21:26:46 -0500741 rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset,
Alex Aizman7ba24712005-08-04 19:30:08 -0700742 sg[i].length, offset);
743 kunmap_atomic(dest, KM_SOFTIRQ0);
744 if (rc == -EAGAIN)
745 /* continue with the next SKB/PDU */
746 return rc;
747 if (!rc) {
748 if (conn->datadgst_en) {
749 if (!offset)
Herbert Xudc64ddf2006-08-24 18:45:50 +1000750 crypto_hash_update(
James Bottomleyc9802cd2006-09-23 15:33:43 -0500751 &tcp_conn->rx_hash,
Mike Christie5bb0b552006-04-06 21:26:46 -0500752 &sg[i], 1);
Alex Aizman7ba24712005-08-04 19:30:08 -0700753 else
Mike Christie62f38302006-08-31 18:09:27 -0400754 partial_sg_digest_update(
James Bottomleyc9802cd2006-09-23 15:33:43 -0500755 &tcp_conn->rx_hash,
Mike Christie5bb0b552006-04-06 21:26:46 -0500756 &sg[i],
Alex Aizman7ba24712005-08-04 19:30:08 -0700757 sg[i].offset + offset,
758 sg[i].length - offset);
759 }
760 offset = 0;
Mike Christie5bb0b552006-04-06 21:26:46 -0500761 tcp_ctask->sg_count++;
Alex Aizman7ba24712005-08-04 19:30:08 -0700762 }
763
764 if (!ctask->data_count) {
765 if (rc && conn->datadgst_en)
766 /*
767 * data-in is complete, but buffer not...
768 */
James Bottomleyc9802cd2006-09-23 15:33:43 -0500769 partial_sg_digest_update(&tcp_conn->rx_hash,
770 &sg[i],
771 sg[i].offset,
772 sg[i].length-rc);
Alex Aizman7ba24712005-08-04 19:30:08 -0700773 rc = 0;
774 break;
775 }
776
Mike Christie5bb0b552006-04-06 21:26:46 -0500777 if (!tcp_conn->in.copy)
Alex Aizman7ba24712005-08-04 19:30:08 -0700778 return -EAGAIN;
779 }
780 BUG_ON(ctask->data_count);
781
782done:
783 /* check for non-exceptional status */
Mike Christie5bb0b552006-04-06 21:26:46 -0500784 if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) {
Mike Christieb6c395e2006-07-24 15:47:15 -0500785 debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
786 (long)sc, sc->result, ctask->itt,
787 tcp_conn->in.hdr->flags);
Mike Christie5bb0b552006-04-06 21:26:46 -0500788 spin_lock(&conn->session->lock);
Mike Christie5bb0b552006-04-06 21:26:46 -0500789 __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
790 spin_unlock(&conn->session->lock);
Alex Aizman7ba24712005-08-04 19:30:08 -0700791 }
792
793 return rc;
794}
795
796static int
797iscsi_data_recv(struct iscsi_conn *conn)
798{
Mike Christie5bb0b552006-04-06 21:26:46 -0500799 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
800 int rc = 0, opcode;
Alex Aizman7ba24712005-08-04 19:30:08 -0700801
Mike Christie5bb0b552006-04-06 21:26:46 -0500802 opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
803 switch (opcode) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700804 case ISCSI_OP_SCSI_DATA_IN:
805 rc = iscsi_scsi_data_in(conn);
806 break;
Mike Christie5bb0b552006-04-06 21:26:46 -0500807 case ISCSI_OP_SCSI_CMD_RSP:
Alex Aizman7ba24712005-08-04 19:30:08 -0700808 case ISCSI_OP_TEXT_RSP:
809 case ISCSI_OP_LOGIN_RSP:
Mike Christie5bb0b552006-04-06 21:26:46 -0500810 case ISCSI_OP_ASYNC_EVENT:
811 case ISCSI_OP_REJECT:
Alex Aizman7ba24712005-08-04 19:30:08 -0700812 /*
813 * Collect data segment to the connection's data
814 * placeholder
815 */
Mike Christieca518682006-08-31 18:09:32 -0400816 if (iscsi_tcp_copy(conn, tcp_conn->in.datalen)) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700817 rc = -EAGAIN;
818 goto exit;
819 }
820
Mike Christiec8dc1e52006-07-24 15:47:39 -0500821 rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data,
Mike Christie5bb0b552006-04-06 21:26:46 -0500822 tcp_conn->in.datalen);
823 if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP)
Mike Christiec8dc1e52006-07-24 15:47:39 -0500824 iscsi_recv_digest_update(tcp_conn, conn->data,
Mike Christie5bb0b552006-04-06 21:26:46 -0500825 tcp_conn->in.datalen);
826 break;
Alex Aizman7ba24712005-08-04 19:30:08 -0700827 default:
828 BUG_ON(1);
829 }
830exit:
831 return rc;
832}
833
834/**
835 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
836 * @rd_desc: read descriptor
837 * @skb: socket buffer
838 * @offset: offset in skb
839 * @len: skb->len - offset
840 **/
841static int
842iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
843 unsigned int offset, size_t len)
844{
845 int rc;
846 struct iscsi_conn *conn = rd_desc->arg.data;
Mike Christie5bb0b552006-04-06 21:26:46 -0500847 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -0700848 int processed;
849 char pad[ISCSI_PAD_LEN];
850 struct scatterlist sg;
851
852 /*
853 * Save current SKB and its offset in the corresponding
854 * connection context.
855 */
Mike Christie5bb0b552006-04-06 21:26:46 -0500856 tcp_conn->in.copy = skb->len - offset;
857 tcp_conn->in.offset = offset;
858 tcp_conn->in.skb = skb;
859 tcp_conn->in.len = tcp_conn->in.copy;
860 BUG_ON(tcp_conn->in.copy <= 0);
861 debug_tcp("in %d bytes\n", tcp_conn->in.copy);
Alex Aizman7ba24712005-08-04 19:30:08 -0700862
863more:
Mike Christie5bb0b552006-04-06 21:26:46 -0500864 tcp_conn->in.copied = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700865 rc = 0;
866
867 if (unlikely(conn->suspend_rx)) {
868 debug_tcp("conn %d Rx suspended!\n", conn->id);
869 return 0;
870 }
871
Mike Christie5bb0b552006-04-06 21:26:46 -0500872 if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
873 tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
874 rc = iscsi_hdr_extract(tcp_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -0700875 if (rc) {
876 if (rc == -EAGAIN)
877 goto nomore;
878 else {
Mike Christied82967c2006-07-24 15:47:11 -0500879 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
Alex Aizman7ba24712005-08-04 19:30:08 -0700880 return 0;
881 }
882 }
883
884 /*
885 * Verify and process incoming PDU header.
886 */
Mike Christie5bb0b552006-04-06 21:26:46 -0500887 rc = iscsi_tcp_hdr_recv(conn);
888 if (!rc && tcp_conn->in.datalen) {
Mike Christiedd8c0d92006-08-31 18:09:28 -0400889 if (conn->datadgst_en)
James Bottomleyc9802cd2006-09-23 15:33:43 -0500890 crypto_hash_init(&tcp_conn->rx_hash);
Mike Christie5bb0b552006-04-06 21:26:46 -0500891 tcp_conn->in_progress = IN_PROGRESS_DATA_RECV;
Alex Aizman7ba24712005-08-04 19:30:08 -0700892 } else if (rc) {
Mike Christie40527af2006-07-24 15:47:45 -0500893 iscsi_conn_failure(conn, rc);
Alex Aizman7ba24712005-08-04 19:30:08 -0700894 return 0;
895 }
896 }
897
Mike Christie5bb0b552006-04-06 21:26:46 -0500898 if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
Mike Christief6cfba12005-11-29 23:12:57 -0600899 uint32_t recv_digest;
Mike Christie5bb0b552006-04-06 21:26:46 -0500900
Alex Aizman7ba24712005-08-04 19:30:08 -0700901 debug_tcp("extra data_recv offset %d copy %d\n",
Mike Christie5bb0b552006-04-06 21:26:46 -0500902 tcp_conn->in.offset, tcp_conn->in.copy);
Mike Christieca518682006-08-31 18:09:32 -0400903 rc = iscsi_tcp_copy(conn, sizeof(uint32_t));
904 if (rc) {
905 if (rc == -EAGAIN)
906 goto again;
907 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
908 return 0;
909 }
910
911 memcpy(&recv_digest, conn->data, sizeof(uint32_t));
Mike Christie5bb0b552006-04-06 21:26:46 -0500912 if (recv_digest != tcp_conn->in.datadgst) {
Mike Christief6cfba12005-11-29 23:12:57 -0600913 debug_tcp("iscsi_tcp: data digest error!"
914 "0x%x != 0x%x\n", recv_digest,
Mike Christie5bb0b552006-04-06 21:26:46 -0500915 tcp_conn->in.datadgst);
Mike Christief6cfba12005-11-29 23:12:57 -0600916 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
917 return 0;
918 } else {
919 debug_tcp("iscsi_tcp: data digest match!"
920 "0x%x == 0x%x\n", recv_digest,
Mike Christie5bb0b552006-04-06 21:26:46 -0500921 tcp_conn->in.datadgst);
922 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
Alex Aizman7ba24712005-08-04 19:30:08 -0700923 }
924 }
925
Mike Christie5bb0b552006-04-06 21:26:46 -0500926 if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV &&
927 tcp_conn->in.copy) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700928
929 debug_tcp("data_recv offset %d copy %d\n",
Mike Christie5bb0b552006-04-06 21:26:46 -0500930 tcp_conn->in.offset, tcp_conn->in.copy);
Alex Aizman7ba24712005-08-04 19:30:08 -0700931
932 rc = iscsi_data_recv(conn);
933 if (rc) {
Mike Christie665b44a2006-05-02 19:46:49 -0500934 if (rc == -EAGAIN)
Alex Aizman7ba24712005-08-04 19:30:08 -0700935 goto again;
Mike Christied82967c2006-07-24 15:47:11 -0500936 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
Alex Aizman7ba24712005-08-04 19:30:08 -0700937 return 0;
938 }
Mike Christie5bb0b552006-04-06 21:26:46 -0500939 tcp_conn->in.copy -= tcp_conn->in.padding;
940 tcp_conn->in.offset += tcp_conn->in.padding;
Mike Christie8a47cd32005-11-30 02:27:19 -0600941 if (conn->datadgst_en) {
Mike Christie5bb0b552006-04-06 21:26:46 -0500942 if (tcp_conn->in.padding) {
943 debug_tcp("padding -> %d\n",
944 tcp_conn->in.padding);
945 memset(pad, 0, tcp_conn->in.padding);
946 sg_init_one(&sg, pad, tcp_conn->in.padding);
James Bottomleyc9802cd2006-09-23 15:33:43 -0500947 crypto_hash_update(&tcp_conn->rx_hash,
Herbert Xudc64ddf2006-08-24 18:45:50 +1000948 &sg, sg.length);
Alex Aizman7ba24712005-08-04 19:30:08 -0700949 }
James Bottomleyc9802cd2006-09-23 15:33:43 -0500950 crypto_hash_final(&tcp_conn->rx_hash,
951 (u8 *) &tcp_conn->in.datadgst);
Mike Christie5bb0b552006-04-06 21:26:46 -0500952 debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst);
953 tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
Mike Christieca518682006-08-31 18:09:32 -0400954 tcp_conn->data_copied = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -0700955 } else
Mike Christie5bb0b552006-04-06 21:26:46 -0500956 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
Alex Aizman7ba24712005-08-04 19:30:08 -0700957 }
958
959 debug_tcp("f, processed %d from out of %d padding %d\n",
Mike Christie5bb0b552006-04-06 21:26:46 -0500960 tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding);
961 BUG_ON(tcp_conn->in.offset - offset > len);
Alex Aizman7ba24712005-08-04 19:30:08 -0700962
Mike Christie5bb0b552006-04-06 21:26:46 -0500963 if (tcp_conn->in.offset - offset != len) {
Alex Aizman7ba24712005-08-04 19:30:08 -0700964 debug_tcp("continue to process %d bytes\n",
Mike Christie5bb0b552006-04-06 21:26:46 -0500965 (int)len - (tcp_conn->in.offset - offset));
Alex Aizman7ba24712005-08-04 19:30:08 -0700966 goto more;
967 }
968
969nomore:
Mike Christie5bb0b552006-04-06 21:26:46 -0500970 processed = tcp_conn->in.offset - offset;
Alex Aizman7ba24712005-08-04 19:30:08 -0700971 BUG_ON(processed == 0);
972 return processed;
973
974again:
Mike Christie5bb0b552006-04-06 21:26:46 -0500975 processed = tcp_conn->in.offset - offset;
Alex Aizman7ba24712005-08-04 19:30:08 -0700976 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
977 processed, (int)len, (int)rd_desc->count);
978 BUG_ON(processed == 0);
979 BUG_ON(processed > len);
980
981 conn->rxdata_octets += processed;
982 return processed;
983}
984
985static void
986iscsi_tcp_data_ready(struct sock *sk, int flag)
987{
988 struct iscsi_conn *conn = sk->sk_user_data;
989 read_descriptor_t rd_desc;
990
991 read_lock(&sk->sk_callback_lock);
992
Mike Christie665b44a2006-05-02 19:46:49 -0500993 /*
994 * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv.
995 * We set count to 1 because we want the network layer to
996 * hand us all the skbs that are available. iscsi_tcp_data_recv
997 * handled pdus that cross buffers or pdus that still need data.
998 */
Alex Aizman7ba24712005-08-04 19:30:08 -0700999 rd_desc.arg.data = conn;
Mike Christie665b44a2006-05-02 19:46:49 -05001000 rd_desc.count = 1;
Alex Aizman7ba24712005-08-04 19:30:08 -07001001 tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
1002
1003 read_unlock(&sk->sk_callback_lock);
1004}
1005
1006static void
1007iscsi_tcp_state_change(struct sock *sk)
1008{
Mike Christie5bb0b552006-04-06 21:26:46 -05001009 struct iscsi_tcp_conn *tcp_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -07001010 struct iscsi_conn *conn;
1011 struct iscsi_session *session;
1012 void (*old_state_change)(struct sock *);
1013
1014 read_lock(&sk->sk_callback_lock);
1015
1016 conn = (struct iscsi_conn*)sk->sk_user_data;
1017 session = conn->session;
1018
Mike Christiee6273992005-11-29 23:12:49 -06001019 if ((sk->sk_state == TCP_CLOSE_WAIT ||
1020 sk->sk_state == TCP_CLOSE) &&
1021 !atomic_read(&sk->sk_rmem_alloc)) {
Alex Aizman7ba24712005-08-04 19:30:08 -07001022 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1023 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1024 }
1025
Mike Christie5bb0b552006-04-06 21:26:46 -05001026 tcp_conn = conn->dd_data;
1027 old_state_change = tcp_conn->old_state_change;
Alex Aizman7ba24712005-08-04 19:30:08 -07001028
1029 read_unlock(&sk->sk_callback_lock);
1030
1031 old_state_change(sk);
1032}
1033
1034/**
1035 * iscsi_write_space - Called when more output buffer space is available
1036 * @sk: socket space is available for
1037 **/
1038static void
1039iscsi_write_space(struct sock *sk)
1040{
1041 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
Mike Christie5bb0b552006-04-06 21:26:46 -05001042 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1043
1044 tcp_conn->old_write_space(sk);
Alex Aizman7ba24712005-08-04 19:30:08 -07001045 debug_tcp("iscsi_write_space: cid %d\n", conn->id);
Mike Christie55e32992006-01-13 18:05:53 -06001046 scsi_queue_work(conn->session->host, &conn->xmitwork);
Alex Aizman7ba24712005-08-04 19:30:08 -07001047}
1048
1049static void
1050iscsi_conn_set_callbacks(struct iscsi_conn *conn)
1051{
Mike Christie5bb0b552006-04-06 21:26:46 -05001052 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1053 struct sock *sk = tcp_conn->sock->sk;
Alex Aizman7ba24712005-08-04 19:30:08 -07001054
1055 /* assign new callbacks */
1056 write_lock_bh(&sk->sk_callback_lock);
1057 sk->sk_user_data = conn;
Mike Christie5bb0b552006-04-06 21:26:46 -05001058 tcp_conn->old_data_ready = sk->sk_data_ready;
1059 tcp_conn->old_state_change = sk->sk_state_change;
1060 tcp_conn->old_write_space = sk->sk_write_space;
Alex Aizman7ba24712005-08-04 19:30:08 -07001061 sk->sk_data_ready = iscsi_tcp_data_ready;
1062 sk->sk_state_change = iscsi_tcp_state_change;
1063 sk->sk_write_space = iscsi_write_space;
1064 write_unlock_bh(&sk->sk_callback_lock);
1065}
1066
1067static void
Mike Christie1c834692006-07-24 15:47:26 -05001068iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
Alex Aizman7ba24712005-08-04 19:30:08 -07001069{
Mike Christie5bb0b552006-04-06 21:26:46 -05001070 struct sock *sk = tcp_conn->sock->sk;
Alex Aizman7ba24712005-08-04 19:30:08 -07001071
1072 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1073 write_lock_bh(&sk->sk_callback_lock);
1074 sk->sk_user_data = NULL;
Mike Christie5bb0b552006-04-06 21:26:46 -05001075 sk->sk_data_ready = tcp_conn->old_data_ready;
1076 sk->sk_state_change = tcp_conn->old_state_change;
1077 sk->sk_write_space = tcp_conn->old_write_space;
Alex Aizman7ba24712005-08-04 19:30:08 -07001078 sk->sk_no_check = 0;
1079 write_unlock_bh(&sk->sk_callback_lock);
1080}
1081
1082/**
1083 * iscsi_send - generic send routine
1084 * @sk: kernel's socket
1085 * @buf: buffer to write from
1086 * @size: actual size to write
1087 * @flags: socket's flags
Alex Aizman7ba24712005-08-04 19:30:08 -07001088 */
1089static inline int
FUJITA Tomonori56851692006-01-13 18:05:44 -06001090iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags)
Alex Aizman7ba24712005-08-04 19:30:08 -07001091{
Mike Christie5bb0b552006-04-06 21:26:46 -05001092 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1093 struct socket *sk = tcp_conn->sock;
Mike Christie3219e522006-05-30 00:37:28 -05001094 int offset = buf->sg.offset + buf->sent, res;
Alex Aizman7ba24712005-08-04 19:30:08 -07001095
Mike Christie7cae5152006-01-13 18:05:47 -06001096 /*
1097 * if we got use_sg=0 or are sending something we kmallocd
1098 * then we did not have to do kmap (kmap returns page_address)
1099 *
1100 * if we got use_sg > 0, but had to drop down, we do not
1101 * set clustering so this should only happen for that
1102 * slab case.
1103 */
1104 if (buf->use_sendmsg)
Mike Christie3219e522006-05-30 00:37:28 -05001105 res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
Mike Christie7cae5152006-01-13 18:05:47 -06001106 else
Mike Christie3219e522006-05-30 00:37:28 -05001107 res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags);
1108
1109 if (res >= 0) {
1110 conn->txdata_octets += res;
1111 buf->sent += res;
1112 return res;
1113 }
1114
1115 tcp_conn->sendpage_failures_cnt++;
1116 if (res == -EAGAIN)
1117 res = -ENOBUFS;
1118 else
1119 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1120 return res;
Alex Aizman7ba24712005-08-04 19:30:08 -07001121}
1122
1123/**
1124 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1125 * @conn: iscsi connection
1126 * @buf: buffer to write from
1127 * @datalen: lenght of data to be sent after the header
1128 *
1129 * Notes:
1130 * (Tx, Fast Path)
1131 **/
1132static inline int
1133iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
1134{
Alex Aizman7ba24712005-08-04 19:30:08 -07001135 int flags = 0; /* MSG_DONTWAIT; */
1136 int res, size;
1137
1138 size = buf->sg.length - buf->sent;
1139 BUG_ON(buf->sent + size > buf->sg.length);
1140 if (buf->sent + size != buf->sg.length || datalen)
1141 flags |= MSG_MORE;
1142
FUJITA Tomonori56851692006-01-13 18:05:44 -06001143 res = iscsi_send(conn, buf, size, flags);
Alex Aizman7ba24712005-08-04 19:30:08 -07001144 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
1145 if (res >= 0) {
Alex Aizman7ba24712005-08-04 19:30:08 -07001146 if (size != res)
1147 return -EAGAIN;
1148 return 0;
Mike Christie3219e522006-05-30 00:37:28 -05001149 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001150
1151 return res;
1152}
1153
1154/**
1155 * iscsi_sendpage - send one page of iSCSI Data-Out.
1156 * @conn: iscsi connection
1157 * @buf: buffer to write from
1158 * @count: remaining data
1159 * @sent: number of bytes sent
1160 *
1161 * Notes:
1162 * (Tx, Fast Path)
1163 **/
1164static inline int
1165iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
1166 int *count, int *sent)
1167{
Alex Aizman7ba24712005-08-04 19:30:08 -07001168 int flags = 0; /* MSG_DONTWAIT; */
1169 int res, size;
1170
1171 size = buf->sg.length - buf->sent;
1172 BUG_ON(buf->sent + size > buf->sg.length);
1173 if (size > *count)
1174 size = *count;
Mike Christieb13941f2005-09-12 21:01:28 -05001175 if (buf->sent + size != buf->sg.length || *count != size)
Alex Aizman7ba24712005-08-04 19:30:08 -07001176 flags |= MSG_MORE;
1177
FUJITA Tomonori56851692006-01-13 18:05:44 -06001178 res = iscsi_send(conn, buf, size, flags);
Alex Aizman7ba24712005-08-04 19:30:08 -07001179 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1180 size, buf->sent, *count, *sent, res);
1181 if (res >= 0) {
Alex Aizman7ba24712005-08-04 19:30:08 -07001182 *count -= res;
1183 *sent += res;
1184 if (size != res)
1185 return -EAGAIN;
1186 return 0;
Mike Christie3219e522006-05-30 00:37:28 -05001187 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001188
1189 return res;
1190}
1191
1192static inline void
Mike Christie5bb0b552006-04-06 21:26:46 -05001193iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
Mike Christie62f38302006-08-31 18:09:27 -04001194 struct iscsi_tcp_cmd_task *tcp_ctask)
Alex Aizman7ba24712005-08-04 19:30:08 -07001195{
James Bottomleyc9802cd2006-09-23 15:33:43 -05001196 crypto_hash_init(&tcp_conn->tx_hash);
Mike Christie5bb0b552006-04-06 21:26:46 -05001197 tcp_ctask->digest_count = 4;
Alex Aizman7ba24712005-08-04 19:30:08 -07001198}
1199
Alex Aizman7ba24712005-08-04 19:30:08 -07001200/**
1201 * iscsi_solicit_data_cont - initialize next Data-Out
1202 * @conn: iscsi connection
1203 * @ctask: scsi command task
1204 * @r2t: R2T info
1205 * @left: bytes left to transfer
1206 *
1207 * Notes:
1208 * Initialize next Data-Out within this R2T sequence and continue
1209 * to process next Scatter-Gather element(if any) of this SCSI command.
1210 *
1211 * Called under connection lock.
1212 **/
1213static void
1214iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1215 struct iscsi_r2t_info *r2t, int left)
1216{
1217 struct iscsi_data *hdr;
Alex Aizman7ba24712005-08-04 19:30:08 -07001218 struct scsi_cmnd *sc = ctask->sc;
1219 int new_offset;
1220
Mike Christieffbfe922006-05-18 20:31:36 -05001221 hdr = &r2t->dtask.hdr;
Alex Aizman7ba24712005-08-04 19:30:08 -07001222 memset(hdr, 0, sizeof(struct iscsi_data));
1223 hdr->ttt = r2t->ttt;
1224 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
1225 r2t->solicit_datasn++;
1226 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
Mike Christie5bb0b552006-04-06 21:26:46 -05001227 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1228 hdr->itt = ctask->hdr->itt;
Alex Aizman7ba24712005-08-04 19:30:08 -07001229 hdr->exp_statsn = r2t->exp_statsn;
1230 new_offset = r2t->data_offset + r2t->sent;
1231 hdr->offset = cpu_to_be32(new_offset);
1232 if (left > conn->max_xmit_dlength) {
1233 hton24(hdr->dlength, conn->max_xmit_dlength);
1234 r2t->data_count = conn->max_xmit_dlength;
1235 } else {
1236 hton24(hdr->dlength, left);
1237 r2t->data_count = left;
1238 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1239 }
1240 conn->dataout_pdus_cnt++;
1241
Mike Christie6e458cc2006-05-18 20:31:31 -05001242 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
Mike Christieaf973482005-09-12 21:01:32 -05001243 sizeof(struct iscsi_hdr));
Alex Aizman7ba24712005-08-04 19:30:08 -07001244
Mike Christie62f38302006-08-31 18:09:27 -04001245 if (iscsi_buf_left(&r2t->sendbuf))
1246 return;
1247
1248 if (sc->use_sg) {
Alex Aizman7ba24712005-08-04 19:30:08 -07001249 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1250 r2t->sg += 1;
Mike Christie62f38302006-08-31 18:09:27 -04001251 } else {
1252 iscsi_buf_init_iov(&r2t->sendbuf,
Alex Aizman7ba24712005-08-04 19:30:08 -07001253 (char*)sc->request_buffer + new_offset,
1254 r2t->data_count);
Mike Christie62f38302006-08-31 18:09:27 -04001255 r2t->sg = NULL;
1256 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001257}
1258
Mike Christie62f38302006-08-31 18:09:27 -04001259static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask,
1260 unsigned long len)
Alex Aizman7ba24712005-08-04 19:30:08 -07001261{
Mike Christie62f38302006-08-31 18:09:27 -04001262 tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1);
1263 if (!tcp_ctask->pad_count)
1264 return;
Alex Aizman7ba24712005-08-04 19:30:08 -07001265
Mike Christie62f38302006-08-31 18:09:27 -04001266 tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count;
1267 debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count);
1268 tcp_ctask->xmstate |= XMSTATE_W_PAD;
Alex Aizman7ba24712005-08-04 19:30:08 -07001269}
1270
1271/**
Mike Christie5bb0b552006-04-06 21:26:46 -05001272 * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
Alex Aizman7ba24712005-08-04 19:30:08 -07001273 * @conn: iscsi connection
1274 * @ctask: scsi command task
1275 * @sc: scsi command
1276 **/
1277static void
Mike Christie5bb0b552006-04-06 21:26:46 -05001278iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
Alex Aizman7ba24712005-08-04 19:30:08 -07001279{
Mike Christie5bb0b552006-04-06 21:26:46 -05001280 struct scsi_cmnd *sc = ctask->sc;
1281 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -07001282
Mike Christie5bb0b552006-04-06 21:26:46 -05001283 BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
Alex Aizman7ba24712005-08-04 19:30:08 -07001284
Mike Christie5bb0b552006-04-06 21:26:46 -05001285 tcp_ctask->sent = 0;
1286 tcp_ctask->sg_count = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -07001287
1288 if (sc->sc_data_direction == DMA_TO_DEVICE) {
Mike Christie5bb0b552006-04-06 21:26:46 -05001289 tcp_ctask->xmstate = XMSTATE_W_HDR;
1290 tcp_ctask->exp_r2tsn = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -07001291 BUG_ON(ctask->total_length == 0);
Mike Christie5bb0b552006-04-06 21:26:46 -05001292
Alex Aizman7ba24712005-08-04 19:30:08 -07001293 if (sc->use_sg) {
1294 struct scatterlist *sg = sc->request_buffer;
1295
Mike Christie62f38302006-08-31 18:09:27 -04001296 iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
1297 tcp_ctask->sg = sg + 1;
Mike Christie5bb0b552006-04-06 21:26:46 -05001298 tcp_ctask->bad_sg = sg + sc->use_sg;
Mike Christie62f38302006-08-31 18:09:27 -04001299 } else {
Mike Christie5bb0b552006-04-06 21:26:46 -05001300 iscsi_buf_init_iov(&tcp_ctask->sendbuf,
1301 sc->request_buffer,
1302 sc->request_bufflen);
Mike Christie62f38302006-08-31 18:09:27 -04001303 tcp_ctask->sg = NULL;
1304 tcp_ctask->bad_sg = NULL;
Mike Christie5bb0b552006-04-06 21:26:46 -05001305 }
Mike Christieffd04362006-08-31 18:09:24 -04001306 debug_scsi("cmd [itt 0x%x total %d imm_data %d "
1307 "unsol count %d, unsol offset %d]\n",
Alex Aizman7ba24712005-08-04 19:30:08 -07001308 ctask->itt, ctask->total_length, ctask->imm_count,
Mike Christieffd04362006-08-31 18:09:24 -04001309 ctask->unsol_count, ctask->unsol_offset);
Mike Christie5bb0b552006-04-06 21:26:46 -05001310 } else
1311 tcp_ctask->xmstate = XMSTATE_R_HDR;
Alex Aizman7ba24712005-08-04 19:30:08 -07001312
Mike Christie6e458cc2006-05-18 20:31:31 -05001313 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
Mike Christieaf973482005-09-12 21:01:32 -05001314 sizeof(struct iscsi_hdr));
Alex Aizman7ba24712005-08-04 19:30:08 -07001315}
1316
1317/**
Mike Christie5bb0b552006-04-06 21:26:46 -05001318 * iscsi_tcp_mtask_xmit - xmit management(immediate) task
Alex Aizman7ba24712005-08-04 19:30:08 -07001319 * @conn: iscsi connection
1320 * @mtask: task management task
1321 *
1322 * Notes:
1323 * The function can return -EAGAIN in which case caller must
1324 * call it again later, or recover. '0' return code means successful
1325 * xmit.
1326 *
1327 * Management xmit state machine consists of two states:
1328 * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
1329 * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
1330 **/
1331static int
Mike Christie5bb0b552006-04-06 21:26:46 -05001332iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
Alex Aizman7ba24712005-08-04 19:30:08 -07001333{
Mike Christie5bb0b552006-04-06 21:26:46 -05001334 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
Mike Christie3219e522006-05-30 00:37:28 -05001335 int rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001336
1337 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
Mike Christie5bb0b552006-04-06 21:26:46 -05001338 conn->id, tcp_mtask->xmstate, mtask->itt);
Alex Aizman7ba24712005-08-04 19:30:08 -07001339
Mike Christie5bb0b552006-04-06 21:26:46 -05001340 if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) {
1341 tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR;
Alex Aizman7ba24712005-08-04 19:30:08 -07001342 if (mtask->data_count)
Mike Christie5bb0b552006-04-06 21:26:46 -05001343 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
Mike Christieaf973482005-09-12 21:01:32 -05001344 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
Mike Christie30a6c652006-04-06 21:13:39 -05001345 conn->stop_stage != STOP_CONN_RECOVER &&
Mike Christieaf973482005-09-12 21:01:32 -05001346 conn->hdrdgst_en)
Mike Christie5bb0b552006-04-06 21:26:46 -05001347 iscsi_hdr_digest(conn, &tcp_mtask->headbuf,
1348 (u8*)tcp_mtask->hdrext);
Mike Christie3219e522006-05-30 00:37:28 -05001349 rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
1350 mtask->data_count);
1351 if (rc) {
Mike Christie5bb0b552006-04-06 21:26:46 -05001352 tcp_mtask->xmstate |= XMSTATE_IMM_HDR;
Alex Aizman7ba24712005-08-04 19:30:08 -07001353 if (mtask->data_count)
Mike Christie5bb0b552006-04-06 21:26:46 -05001354 tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
Mike Christie3219e522006-05-30 00:37:28 -05001355 return rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001356 }
1357 }
1358
Mike Christie5bb0b552006-04-06 21:26:46 -05001359 if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) {
Alex Aizman7ba24712005-08-04 19:30:08 -07001360 BUG_ON(!mtask->data_count);
Mike Christie5bb0b552006-04-06 21:26:46 -05001361 tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
Alex Aizman7ba24712005-08-04 19:30:08 -07001362 /* FIXME: implement.
1363 * Virtual buffer could be spreaded across multiple pages...
1364 */
1365 do {
Mike Christie3219e522006-05-30 00:37:28 -05001366 int rc;
1367
1368 rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf,
1369 &mtask->data_count, &tcp_mtask->sent);
1370 if (rc) {
Mike Christie5bb0b552006-04-06 21:26:46 -05001371 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
Mike Christie3219e522006-05-30 00:37:28 -05001372 return rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001373 }
1374 } while (mtask->data_count);
1375 }
1376
Mike Christie5bb0b552006-04-06 21:26:46 -05001377 BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE);
1378 if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1379 struct iscsi_session *session = conn->session;
1380
1381 spin_lock_bh(&session->lock);
1382 list_del(&conn->mtask->running);
1383 __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask,
1384 sizeof(void*));
1385 spin_unlock_bh(&session->lock);
1386 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001387 return 0;
1388}
1389
1390static inline int
Mike Christie62f38302006-08-31 18:09:27 -04001391iscsi_send_read_hdr(struct iscsi_conn *conn,
1392 struct iscsi_tcp_cmd_task *tcp_ctask)
Alex Aizman7ba24712005-08-04 19:30:08 -07001393{
Mike Christie3219e522006-05-30 00:37:28 -05001394 int rc;
1395
Mike Christie5bb0b552006-04-06 21:26:46 -05001396 tcp_ctask->xmstate &= ~XMSTATE_R_HDR;
FUJITA Tomonori42f72aa2006-01-13 18:05:35 -06001397 if (conn->hdrdgst_en)
Mike Christie5bb0b552006-04-06 21:26:46 -05001398 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1399 (u8*)tcp_ctask->hdrext);
Mike Christie3219e522006-05-30 00:37:28 -05001400 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0);
1401 if (!rc) {
Mike Christie5bb0b552006-04-06 21:26:46 -05001402 BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE);
Alex Aizman7ba24712005-08-04 19:30:08 -07001403 return 0; /* wait for Data-In */
1404 }
Mike Christie5bb0b552006-04-06 21:26:46 -05001405 tcp_ctask->xmstate |= XMSTATE_R_HDR;
Mike Christie3219e522006-05-30 00:37:28 -05001406 return rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001407}
1408
1409static inline int
Mike Christie62f38302006-08-31 18:09:27 -04001410iscsi_send_write_hdr(struct iscsi_conn *conn,
Mike Christie5bb0b552006-04-06 21:26:46 -05001411 struct iscsi_cmd_task *ctask)
Alex Aizman7ba24712005-08-04 19:30:08 -07001412{
Mike Christie5bb0b552006-04-06 21:26:46 -05001413 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
Mike Christie3219e522006-05-30 00:37:28 -05001414 int rc;
Mike Christie5bb0b552006-04-06 21:26:46 -05001415
1416 tcp_ctask->xmstate &= ~XMSTATE_W_HDR;
FUJITA Tomonori42f72aa2006-01-13 18:05:35 -06001417 if (conn->hdrdgst_en)
Mike Christie5bb0b552006-04-06 21:26:46 -05001418 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1419 (u8*)tcp_ctask->hdrext);
Mike Christie3219e522006-05-30 00:37:28 -05001420 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
Mike Christie3219e522006-05-30 00:37:28 -05001421 if (rc) {
Mike Christie62f38302006-08-31 18:09:27 -04001422 tcp_ctask->xmstate |= XMSTATE_W_HDR;
1423 return rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001424 }
Mike Christie3219e522006-05-30 00:37:28 -05001425
Mike Christie62f38302006-08-31 18:09:27 -04001426 if (ctask->imm_count) {
1427 tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
1428 iscsi_set_padding(tcp_ctask, ctask->imm_count);
Alex Aizman7ba24712005-08-04 19:30:08 -07001429
Mike Christie62f38302006-08-31 18:09:27 -04001430 if (ctask->conn->datadgst_en) {
1431 iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
1432 tcp_ctask->immdigest = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -07001433 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001434 }
1435
Mike Christie62f38302006-08-31 18:09:27 -04001436 if (ctask->unsol_count)
1437 tcp_ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
Alex Aizman7ba24712005-08-04 19:30:08 -07001438 return 0;
1439}
1440
Mike Christie62f38302006-08-31 18:09:27 -04001441static int
1442iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1443{
1444 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1445 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1446 int sent = 0, rc;
1447
1448 if (tcp_ctask->xmstate & XMSTATE_W_PAD) {
1449 iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad,
1450 tcp_ctask->pad_count);
1451 if (conn->datadgst_en)
James Bottomleyc9802cd2006-09-23 15:33:43 -05001452 crypto_hash_update(&tcp_conn->tx_hash,
1453 &tcp_ctask->sendbuf.sg,
1454 tcp_ctask->sendbuf.sg.length);
Mike Christie62f38302006-08-31 18:09:27 -04001455 } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD))
1456 return 0;
1457
1458 tcp_ctask->xmstate &= ~XMSTATE_W_PAD;
1459 tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD;
1460 debug_scsi("sending %d pad bytes for itt 0x%x\n",
1461 tcp_ctask->pad_count, ctask->itt);
1462 rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count,
1463 &sent);
1464 if (rc) {
1465 debug_scsi("padding send failed %d\n", rc);
1466 tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD;
1467 }
1468 return rc;
1469}
1470
1471static int
1472iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1473 struct iscsi_buf *buf, uint32_t *digest)
1474{
1475 struct iscsi_tcp_cmd_task *tcp_ctask;
1476 struct iscsi_tcp_conn *tcp_conn;
1477 int rc, sent = 0;
1478
1479 if (!conn->datadgst_en)
1480 return 0;
1481
1482 tcp_ctask = ctask->dd_data;
1483 tcp_conn = conn->dd_data;
1484
1485 if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) {
James Bottomleyc9802cd2006-09-23 15:33:43 -05001486 crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest);
Mike Christie62f38302006-08-31 18:09:27 -04001487 iscsi_buf_init_iov(buf, (char*)digest, 4);
1488 }
1489 tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST;
1490
1491 rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent);
1492 if (!rc)
1493 debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest,
1494 ctask->itt);
1495 else {
1496 debug_scsi("sending digest 0x%x failed for itt 0x%x!\n",
1497 *digest, ctask->itt);
1498 tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST;
1499 }
1500 return rc;
1501}
1502
1503static int
1504iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf,
1505 struct scatterlist **sg, int *sent, int *count,
1506 struct iscsi_buf *digestbuf, uint32_t *digest)
1507{
1508 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1509 struct iscsi_conn *conn = ctask->conn;
1510 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1511 int rc, buf_sent, offset;
1512
1513 while (*count) {
1514 buf_sent = 0;
1515 offset = sendbuf->sent;
1516
1517 rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent);
1518 *sent = *sent + buf_sent;
1519 if (buf_sent && conn->datadgst_en)
James Bottomleyc9802cd2006-09-23 15:33:43 -05001520 partial_sg_digest_update(&tcp_conn->tx_hash,
Mike Christie62f38302006-08-31 18:09:27 -04001521 &sendbuf->sg, sendbuf->sg.offset + offset,
1522 buf_sent);
1523 if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) {
1524 iscsi_buf_init_sg(sendbuf, *sg);
1525 *sg = *sg + 1;
1526 }
1527
1528 if (rc)
1529 return rc;
1530 }
1531
1532 rc = iscsi_send_padding(conn, ctask);
1533 if (rc)
1534 return rc;
1535
1536 return iscsi_send_digest(conn, ctask, digestbuf, digest);
1537}
1538
1539static int
1540iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
Alex Aizman7ba24712005-08-04 19:30:08 -07001541{
Mike Christie5bb0b552006-04-06 21:26:46 -05001542 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -07001543 struct iscsi_data_task *dtask;
Mike Christie3219e522006-05-30 00:37:28 -05001544 int rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001545
Mike Christie5bb0b552006-04-06 21:26:46 -05001546 tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
1547 if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
Mike Christie62f38302006-08-31 18:09:27 -04001548 dtask = &tcp_ctask->unsol_dtask;
1549
Mike Christieffd04362006-08-31 18:09:24 -04001550 iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr);
1551 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
1552 sizeof(struct iscsi_hdr));
Mike Christieaf973482005-09-12 21:01:32 -05001553 if (conn->hdrdgst_en)
Mike Christie5bb0b552006-04-06 21:26:46 -05001554 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
Mike Christieaf973482005-09-12 21:01:32 -05001555 (u8*)dtask->hdrext);
Mike Christie62f38302006-08-31 18:09:27 -04001556
Mike Christie5bb0b552006-04-06 21:26:46 -05001557 tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT;
Mike Christie62f38302006-08-31 18:09:27 -04001558 iscsi_set_padding(tcp_ctask, ctask->data_count);
Alex Aizman7ba24712005-08-04 19:30:08 -07001559 }
Mike Christie3219e522006-05-30 00:37:28 -05001560
1561 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
1562 if (rc) {
Mike Christie5bb0b552006-04-06 21:26:46 -05001563 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1564 tcp_ctask->xmstate |= XMSTATE_UNS_HDR;
Mike Christie3219e522006-05-30 00:37:28 -05001565 return rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001566 }
1567
Mike Christiedd8c0d92006-08-31 18:09:28 -04001568 if (conn->datadgst_en) {
1569 dtask = &tcp_ctask->unsol_dtask;
1570 iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
1571 dtask->digest = 0;
1572 }
1573
Alex Aizman7ba24712005-08-04 19:30:08 -07001574 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
Mike Christie5bb0b552006-04-06 21:26:46 -05001575 ctask->itt, ctask->unsol_count, tcp_ctask->sent);
Alex Aizman7ba24712005-08-04 19:30:08 -07001576 return 0;
1577}
1578
Mike Christie62f38302006-08-31 18:09:27 -04001579static int
1580iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
Alex Aizman7ba24712005-08-04 19:30:08 -07001581{
Mike Christie5bb0b552006-04-06 21:26:46 -05001582 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
Mike Christie3219e522006-05-30 00:37:28 -05001583 int rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001584
Mike Christie62f38302006-08-31 18:09:27 -04001585 if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) {
1586 BUG_ON(!ctask->unsol_count);
1587 tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR;
1588send_hdr:
1589 rc = iscsi_send_unsol_hdr(conn, ctask);
1590 if (rc)
1591 return rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001592 }
1593
Mike Christie62f38302006-08-31 18:09:27 -04001594 if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) {
1595 struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask;
Mike Christie5bb0b552006-04-06 21:26:46 -05001596 int start = tcp_ctask->sent;
Alex Aizman7ba24712005-08-04 19:30:08 -07001597
Mike Christie62f38302006-08-31 18:09:27 -04001598 rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
1599 &tcp_ctask->sent, &ctask->data_count,
1600 &dtask->digestbuf, &dtask->digest);
Mike Christie5bb0b552006-04-06 21:26:46 -05001601 ctask->unsol_count -= tcp_ctask->sent - start;
Mike Christie62f38302006-08-31 18:09:27 -04001602 if (rc)
Mike Christie3219e522006-05-30 00:37:28 -05001603 return rc;
Mike Christie62f38302006-08-31 18:09:27 -04001604 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1605 /*
1606 * Done with the Data-Out. Next, check if we need
1607 * to send another unsolicited Data-Out.
1608 */
1609 if (ctask->unsol_count) {
1610 debug_scsi("sending more uns\n");
1611 tcp_ctask->xmstate |= XMSTATE_UNS_INIT;
1612 goto send_hdr;
Alex Aizman7ba24712005-08-04 19:30:08 -07001613 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001614 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001615 return 0;
1616}
1617
Mike Christie62f38302006-08-31 18:09:27 -04001618static int iscsi_send_sol_pdu(struct iscsi_conn *conn,
1619 struct iscsi_cmd_task *ctask)
Alex Aizman7ba24712005-08-04 19:30:08 -07001620{
Mike Christie5bb0b552006-04-06 21:26:46 -05001621 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
Mike Christie62f38302006-08-31 18:09:27 -04001622 struct iscsi_session *session = conn->session;
1623 struct iscsi_r2t_info *r2t;
1624 struct iscsi_data_task *dtask;
Mike Christie3219e522006-05-30 00:37:28 -05001625 int left, rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001626
Mike Christie62f38302006-08-31 18:09:27 -04001627 if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
Mike Christie5bb0b552006-04-06 21:26:46 -05001628 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
Mike Christie62f38302006-08-31 18:09:27 -04001629 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1630 if (!tcp_ctask->r2t)
1631 __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
1632 sizeof(void*));
1633send_hdr:
1634 r2t = tcp_ctask->r2t;
1635 dtask = &r2t->dtask;
Alex Aizman7ba24712005-08-04 19:30:08 -07001636
Mike Christie62f38302006-08-31 18:09:27 -04001637 if (conn->hdrdgst_en)
1638 iscsi_hdr_digest(conn, &r2t->headbuf,
1639 (u8*)dtask->hdrext);
Mike Christie62f38302006-08-31 18:09:27 -04001640 rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
Mike Christie3219e522006-05-30 00:37:28 -05001641 if (rc) {
Mike Christie62f38302006-08-31 18:09:27 -04001642 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
1643 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
Mike Christie3219e522006-05-30 00:37:28 -05001644 return rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001645 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001646
Mike Christiedd8c0d92006-08-31 18:09:28 -04001647 if (conn->datadgst_en) {
1648 iscsi_data_digest_init(conn->dd_data, tcp_ctask);
1649 dtask->digest = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -07001650 }
Mike Christiedd8c0d92006-08-31 18:09:28 -04001651
Mike Christie62f38302006-08-31 18:09:27 -04001652 iscsi_set_padding(tcp_ctask, r2t->data_count);
1653 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
1654 r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
1655 r2t->sent);
Alex Aizman7ba24712005-08-04 19:30:08 -07001656 }
1657
Mike Christie62f38302006-08-31 18:09:27 -04001658 if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) {
1659 r2t = tcp_ctask->r2t;
1660 dtask = &r2t->dtask;
Alex Aizman7ba24712005-08-04 19:30:08 -07001661
Mike Christie62f38302006-08-31 18:09:27 -04001662 rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg,
1663 &r2t->sent, &r2t->data_count,
1664 &dtask->digestbuf, &dtask->digest);
1665 if (rc)
1666 return rc;
1667 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
Alex Aizman7ba24712005-08-04 19:30:08 -07001668
Mike Christie62f38302006-08-31 18:09:27 -04001669 /*
1670 * Done with this Data-Out. Next, check if we have
1671 * to send another Data-Out for this R2T.
1672 */
1673 BUG_ON(r2t->data_length - r2t->sent < 0);
1674 left = r2t->data_length - r2t->sent;
1675 if (left) {
1676 iscsi_solicit_data_cont(conn, ctask, r2t, left);
1677 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1678 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1679 goto send_hdr;
Alex Aizman7ba24712005-08-04 19:30:08 -07001680 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001681
Mike Christie62f38302006-08-31 18:09:27 -04001682 /*
1683 * Done with this R2T. Check if there are more
1684 * outstanding R2Ts ready to be processed.
1685 */
1686 spin_lock_bh(&session->lock);
1687 tcp_ctask->r2t = NULL;
1688 __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
1689 sizeof(void*));
1690 if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t,
1691 sizeof(void*))) {
1692 tcp_ctask->r2t = r2t;
1693 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1694 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1695 spin_unlock_bh(&session->lock);
1696 goto send_hdr;
1697 }
1698 spin_unlock_bh(&session->lock);
1699 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001700 return 0;
1701}
1702
1703static int
Mike Christie5bb0b552006-04-06 21:26:46 -05001704iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
Alex Aizman7ba24712005-08-04 19:30:08 -07001705{
Mike Christie5bb0b552006-04-06 21:26:46 -05001706 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -07001707 int rc = 0;
1708
1709 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
Mike Christie5bb0b552006-04-06 21:26:46 -05001710 conn->id, tcp_ctask->xmstate, ctask->itt);
Alex Aizman7ba24712005-08-04 19:30:08 -07001711
1712 /*
1713 * serialize with TMF AbortTask
1714 */
1715 if (ctask->mtask)
1716 return rc;
1717
Mike Christie3219e522006-05-30 00:37:28 -05001718 if (tcp_ctask->xmstate & XMSTATE_R_HDR)
Mike Christie62f38302006-08-31 18:09:27 -04001719 return iscsi_send_read_hdr(conn, tcp_ctask);
Alex Aizman7ba24712005-08-04 19:30:08 -07001720
Mike Christie5bb0b552006-04-06 21:26:46 -05001721 if (tcp_ctask->xmstate & XMSTATE_W_HDR) {
Mike Christie62f38302006-08-31 18:09:27 -04001722 rc = iscsi_send_write_hdr(conn, ctask);
Alex Aizman7ba24712005-08-04 19:30:08 -07001723 if (rc)
1724 return rc;
1725 }
1726
Mike Christie5bb0b552006-04-06 21:26:46 -05001727 if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) {
Mike Christie62f38302006-08-31 18:09:27 -04001728 rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
1729 &tcp_ctask->sent, &ctask->imm_count,
1730 &tcp_ctask->immbuf, &tcp_ctask->immdigest);
Alex Aizman7ba24712005-08-04 19:30:08 -07001731 if (rc)
1732 return rc;
Mike Christie62f38302006-08-31 18:09:27 -04001733 tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA;
Alex Aizman7ba24712005-08-04 19:30:08 -07001734 }
1735
Mike Christie62f38302006-08-31 18:09:27 -04001736 rc = iscsi_send_unsol_pdu(conn, ctask);
1737 if (rc)
1738 return rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001739
Mike Christie62f38302006-08-31 18:09:27 -04001740 rc = iscsi_send_sol_pdu(conn, ctask);
1741 if (rc)
1742 return rc;
Alex Aizman7ba24712005-08-04 19:30:08 -07001743
1744 return rc;
1745}
1746
Mike Christie7b8631b2006-01-13 18:05:50 -06001747static struct iscsi_cls_conn *
Mike Christie5bb0b552006-04-06 21:26:46 -05001748iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
Alex Aizman7ba24712005-08-04 19:30:08 -07001749{
Mike Christie7b8631b2006-01-13 18:05:50 -06001750 struct iscsi_conn *conn;
1751 struct iscsi_cls_conn *cls_conn;
Mike Christie5bb0b552006-04-06 21:26:46 -05001752 struct iscsi_tcp_conn *tcp_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -07001753
Mike Christie5bb0b552006-04-06 21:26:46 -05001754 cls_conn = iscsi_conn_setup(cls_session, conn_idx);
Mike Christie7b8631b2006-01-13 18:05:50 -06001755 if (!cls_conn)
1756 return NULL;
1757 conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -05001758 /*
1759 * due to strange issues with iser these are not set
1760 * in iscsi_conn_setup
1761 */
Alex Aizman7ba24712005-08-04 19:30:08 -07001762 conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
1763
Mike Christie5bb0b552006-04-06 21:26:46 -05001764 tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
1765 if (!tcp_conn)
1766 goto tcp_conn_alloc_fail;
Alex Aizman7ba24712005-08-04 19:30:08 -07001767
Mike Christie5bb0b552006-04-06 21:26:46 -05001768 conn->dd_data = tcp_conn;
1769 tcp_conn->iscsi_conn = conn;
1770 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1771 /* initial operational parameters */
1772 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
Alex Aizman7ba24712005-08-04 19:30:08 -07001773
James Bottomleyc9802cd2006-09-23 15:33:43 -05001774 tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
1775 CRYPTO_ALG_ASYNC);
1776 tcp_conn->tx_hash.flags = 0;
1777 if (!tcp_conn->tx_hash.tfm)
Mike Christiedd8c0d92006-08-31 18:09:28 -04001778 goto free_tcp_conn;
1779
James Bottomleyc9802cd2006-09-23 15:33:43 -05001780 tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
1781 CRYPTO_ALG_ASYNC);
1782 tcp_conn->rx_hash.flags = 0;
1783 if (!tcp_conn->rx_hash.tfm)
Mike Christiedd8c0d92006-08-31 18:09:28 -04001784 goto free_tx_tfm;
1785
Mike Christie7b8631b2006-01-13 18:05:50 -06001786 return cls_conn;
Alex Aizman7ba24712005-08-04 19:30:08 -07001787
Mike Christiedd8c0d92006-08-31 18:09:28 -04001788free_tx_tfm:
James Bottomleyc9802cd2006-09-23 15:33:43 -05001789 crypto_free_hash(tcp_conn->tx_hash.tfm);
Mike Christiedd8c0d92006-08-31 18:09:28 -04001790free_tcp_conn:
1791 kfree(tcp_conn);
Mike Christie5bb0b552006-04-06 21:26:46 -05001792tcp_conn_alloc_fail:
1793 iscsi_conn_teardown(cls_conn);
Mike Christie7b8631b2006-01-13 18:05:50 -06001794 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -07001795}
1796
1797static void
Mike Christie1c834692006-07-24 15:47:26 -05001798iscsi_tcp_release_conn(struct iscsi_conn *conn)
1799{
1800 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1801
1802 if (!tcp_conn->sock)
1803 return;
1804
1805 sock_hold(tcp_conn->sock->sk);
1806 iscsi_conn_restore_callbacks(tcp_conn);
1807 sock_put(tcp_conn->sock->sk);
1808
1809 sock_release(tcp_conn->sock);
1810 tcp_conn->sock = NULL;
1811 conn->recv_lock = NULL;
1812}
1813
1814static void
Mike Christie5bb0b552006-04-06 21:26:46 -05001815iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
Alex Aizman7ba24712005-08-04 19:30:08 -07001816{
Mike Christie7b8631b2006-01-13 18:05:50 -06001817 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -05001818 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1819 int digest = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -07001820
Mike Christie5bb0b552006-04-06 21:26:46 -05001821 if (conn->hdrdgst_en || conn->datadgst_en)
1822 digest = 1;
Alex Aizman7ba24712005-08-04 19:30:08 -07001823
Mike Christie1c834692006-07-24 15:47:26 -05001824 iscsi_tcp_release_conn(conn);
Mike Christie5bb0b552006-04-06 21:26:46 -05001825 iscsi_conn_teardown(cls_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -07001826
Mike Christie5bb0b552006-04-06 21:26:46 -05001827 /* now free tcp_conn */
1828 if (digest) {
James Bottomleyc9802cd2006-09-23 15:33:43 -05001829 if (tcp_conn->tx_hash.tfm)
1830 crypto_free_hash(tcp_conn->tx_hash.tfm);
1831 if (tcp_conn->rx_hash.tfm)
1832 crypto_free_hash(tcp_conn->rx_hash.tfm);
Alex Aizman7ba24712005-08-04 19:30:08 -07001833 }
1834
Mike Christie5bb0b552006-04-06 21:26:46 -05001835 kfree(tcp_conn);
Alex Aizman7ba24712005-08-04 19:30:08 -07001836}
1837
Mike Christie1c834692006-07-24 15:47:26 -05001838static void
1839iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1840{
1841 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christied5390f52006-08-31 18:09:30 -04001842 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie1c834692006-07-24 15:47:26 -05001843
1844 iscsi_conn_stop(cls_conn, flag);
1845 iscsi_tcp_release_conn(conn);
Mike Christied5390f52006-08-31 18:09:30 -04001846 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
Mike Christie1c834692006-07-24 15:47:26 -05001847}
1848
Alex Aizman7ba24712005-08-04 19:30:08 -07001849static int
Mike Christie5bb0b552006-04-06 21:26:46 -05001850iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
Or Gerlitz264faaa2006-05-02 19:46:36 -05001851 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
Mike Christie5bb0b552006-04-06 21:26:46 -05001852 int is_leading)
Alex Aizman7ba24712005-08-04 19:30:08 -07001853{
Mike Christie5bb0b552006-04-06 21:26:46 -05001854 struct iscsi_conn *conn = cls_conn->dd_data;
1855 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -07001856 struct sock *sk;
1857 struct socket *sock;
1858 int err;
1859
1860 /* lookup for existing socket */
Or Gerlitz264faaa2006-05-02 19:46:36 -05001861 sock = sockfd_lookup((int)transport_eph, &err);
Alex Aizman7ba24712005-08-04 19:30:08 -07001862 if (!sock) {
1863 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
1864 return -EEXIST;
1865 }
1866
Mike Christie5bb0b552006-04-06 21:26:46 -05001867 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
1868 if (err)
1869 return err;
Alex Aizman7ba24712005-08-04 19:30:08 -07001870
Mike Christie67a61112006-05-30 00:37:20 -05001871 /* bind iSCSI connection and socket */
1872 tcp_conn->sock = sock;
Alex Aizman7ba24712005-08-04 19:30:08 -07001873
Mike Christie67a61112006-05-30 00:37:20 -05001874 /* setup Socket parameters */
1875 sk = sock->sk;
1876 sk->sk_reuse = 1;
1877 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
1878 sk->sk_allocation = GFP_ATOMIC;
Alex Aizman7ba24712005-08-04 19:30:08 -07001879
Mike Christie67a61112006-05-30 00:37:20 -05001880 /* FIXME: disable Nagle's algorithm */
Alex Aizman7ba24712005-08-04 19:30:08 -07001881
Mike Christie67a61112006-05-30 00:37:20 -05001882 /*
1883 * Intercept TCP callbacks for sendfile like receive
1884 * processing.
1885 */
1886 conn->recv_lock = &sk->sk_callback_lock;
1887 iscsi_conn_set_callbacks(conn);
1888 tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
1889 /*
1890 * set receive state machine into initial state
1891 */
1892 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
Alex Aizman7ba24712005-08-04 19:30:08 -07001893
Alex Aizman7ba24712005-08-04 19:30:08 -07001894 return 0;
1895}
1896
Mike Christie5bb0b552006-04-06 21:26:46 -05001897/* called with host lock */
Mike Christie30a6c652006-04-06 21:13:39 -05001898static void
Mike Christie5bb0b552006-04-06 21:26:46 -05001899iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask,
1900 char *data, uint32_t data_size)
Mike Christie30a6c652006-04-06 21:13:39 -05001901{
Mike Christie5bb0b552006-04-06 21:26:46 -05001902 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
Mike Christie30a6c652006-04-06 21:13:39 -05001903
Mike Christie6e458cc2006-05-18 20:31:31 -05001904 iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
1905 sizeof(struct iscsi_hdr));
Mike Christie5bb0b552006-04-06 21:26:46 -05001906 tcp_mtask->xmstate = XMSTATE_IMM_HDR;
Mike Christieb6c395e2006-07-24 15:47:15 -05001907 tcp_mtask->sent = 0;
Alex Aizman7ba24712005-08-04 19:30:08 -07001908
Mike Christie5bb0b552006-04-06 21:26:46 -05001909 if (mtask->data_count)
1910 iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data,
Alex Aizman7ba24712005-08-04 19:30:08 -07001911 mtask->data_count);
Alex Aizman7ba24712005-08-04 19:30:08 -07001912}
1913
1914static int
1915iscsi_r2tpool_alloc(struct iscsi_session *session)
1916{
1917 int i;
1918 int cmd_i;
1919
1920 /*
1921 * initialize per-task: R2T pool and xmit queue
1922 */
1923 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1924 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
Mike Christie5bb0b552006-04-06 21:26:46 -05001925 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -07001926
1927 /*
1928 * pre-allocated x4 as much r2ts to handle race when
1929 * target acks DataOut faster than we data_xmit() queues
1930 * could replenish r2tqueue.
1931 */
1932
1933 /* R2T pool */
Mike Christie5bb0b552006-04-06 21:26:46 -05001934 if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
1935 (void***)&tcp_ctask->r2ts,
1936 sizeof(struct iscsi_r2t_info))) {
Alex Aizman7ba24712005-08-04 19:30:08 -07001937 goto r2t_alloc_fail;
1938 }
1939
1940 /* R2T xmit queue */
Mike Christie5bb0b552006-04-06 21:26:46 -05001941 tcp_ctask->r2tqueue = kfifo_alloc(
Alex Aizman7ba24712005-08-04 19:30:08 -07001942 session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
Mike Christie5bb0b552006-04-06 21:26:46 -05001943 if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
1944 iscsi_pool_free(&tcp_ctask->r2tpool,
1945 (void**)tcp_ctask->r2ts);
Alex Aizman7ba24712005-08-04 19:30:08 -07001946 goto r2t_alloc_fail;
1947 }
Alex Aizman7ba24712005-08-04 19:30:08 -07001948 }
1949
1950 return 0;
1951
1952r2t_alloc_fail:
1953 for (i = 0; i < cmd_i; i++) {
Mike Christie5bb0b552006-04-06 21:26:46 -05001954 struct iscsi_cmd_task *ctask = session->cmds[i];
1955 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1956
Mike Christie5bb0b552006-04-06 21:26:46 -05001957 kfifo_free(tcp_ctask->r2tqueue);
1958 iscsi_pool_free(&tcp_ctask->r2tpool,
1959 (void**)tcp_ctask->r2ts);
Alex Aizman7ba24712005-08-04 19:30:08 -07001960 }
1961 return -ENOMEM;
1962}
1963
1964static void
1965iscsi_r2tpool_free(struct iscsi_session *session)
1966{
1967 int i;
1968
1969 for (i = 0; i < session->cmds_max; i++) {
Mike Christie5bb0b552006-04-06 21:26:46 -05001970 struct iscsi_cmd_task *ctask = session->cmds[i];
1971 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1972
Mike Christie5bb0b552006-04-06 21:26:46 -05001973 kfifo_free(tcp_ctask->r2tqueue);
1974 iscsi_pool_free(&tcp_ctask->r2tpool,
1975 (void**)tcp_ctask->r2ts);
Alex Aizman7ba24712005-08-04 19:30:08 -07001976 }
1977}
1978
Alex Aizman7ba24712005-08-04 19:30:08 -07001979static int
Mike Christie7b7232f2006-02-01 21:06:49 -06001980iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
Mike Christie5c75b7f2006-06-28 12:00:26 -05001981 char *buf, int buflen)
Alex Aizman7ba24712005-08-04 19:30:08 -07001982{
Mike Christie7b7232f2006-02-01 21:06:49 -06001983 struct iscsi_conn *conn = cls_conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -07001984 struct iscsi_session *session = conn->session;
Mike Christie5bb0b552006-04-06 21:26:46 -05001985 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christie5c75b7f2006-06-28 12:00:26 -05001986 int value;
Alex Aizman7ba24712005-08-04 19:30:08 -07001987
Alex Aizman7ba24712005-08-04 19:30:08 -07001988 switch(param) {
Alex Aizman7ba24712005-08-04 19:30:08 -07001989 case ISCSI_PARAM_HDRDGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -05001990 iscsi_set_param(cls_conn, param, buf, buflen);
Mike Christie5bb0b552006-04-06 21:26:46 -05001991 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
Mike Christiedd8c0d92006-08-31 18:09:28 -04001992 if (conn->hdrdgst_en)
Mike Christie5bb0b552006-04-06 21:26:46 -05001993 tcp_conn->hdr_size += sizeof(__u32);
Alex Aizman7ba24712005-08-04 19:30:08 -07001994 break;
1995 case ISCSI_PARAM_DATADGST_EN:
Mike Christie5c75b7f2006-06-28 12:00:26 -05001996 iscsi_set_param(cls_conn, param, buf, buflen);
Mike Christie5bb0b552006-04-06 21:26:46 -05001997 tcp_conn->sendpage = conn->datadgst_en ?
1998 sock_no_sendpage : tcp_conn->sock->ops->sendpage;
Alex Aizman7ba24712005-08-04 19:30:08 -07001999 break;
Alex Aizman7ba24712005-08-04 19:30:08 -07002000 case ISCSI_PARAM_MAX_R2T:
Mike Christie5c75b7f2006-06-28 12:00:26 -05002001 sscanf(buf, "%d", &value);
Alex Aizman7ba24712005-08-04 19:30:08 -07002002 if (session->max_r2t == roundup_pow_of_two(value))
2003 break;
2004 iscsi_r2tpool_free(session);
Mike Christie5c75b7f2006-06-28 12:00:26 -05002005 iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -07002006 if (session->max_r2t & (session->max_r2t - 1))
2007 session->max_r2t = roundup_pow_of_two(session->max_r2t);
2008 if (iscsi_r2tpool_alloc(session))
2009 return -ENOMEM;
2010 break;
Alex Aizman7ba24712005-08-04 19:30:08 -07002011 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -05002012 return iscsi_set_param(cls_conn, param, buf, buflen);
Alex Aizman7ba24712005-08-04 19:30:08 -07002013 }
2014
2015 return 0;
2016}
2017
2018static int
Mike Christie5c75b7f2006-06-28 12:00:26 -05002019iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
2020 enum iscsi_param param, char *buf)
Mike Christie7b8631b2006-01-13 18:05:50 -06002021{
Mike Christie7b7232f2006-02-01 21:06:49 -06002022 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -05002023 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Mike Christiefd7255f2006-04-06 21:13:36 -05002024 struct inet_sock *inet;
Mike Christie5c75b7f2006-06-28 12:00:26 -05002025 struct ipv6_pinfo *np;
2026 struct sock *sk;
2027 int len;
Mike Christie7b8631b2006-01-13 18:05:50 -06002028
2029 switch(param) {
Mike Christiefd7255f2006-04-06 21:13:36 -05002030 case ISCSI_PARAM_CONN_PORT:
2031 mutex_lock(&conn->xmitmutex);
Mike Christie5bb0b552006-04-06 21:26:46 -05002032 if (!tcp_conn->sock) {
Mike Christiefd7255f2006-04-06 21:13:36 -05002033 mutex_unlock(&conn->xmitmutex);
2034 return -EINVAL;
2035 }
2036
Mike Christie5bb0b552006-04-06 21:26:46 -05002037 inet = inet_sk(tcp_conn->sock->sk);
Mike Christie5c75b7f2006-06-28 12:00:26 -05002038 len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport));
Mike Christiefd7255f2006-04-06 21:13:36 -05002039 mutex_unlock(&conn->xmitmutex);
Mike Christie8d2860b2006-05-02 19:46:47 -05002040 break;
Mike Christiefd7255f2006-04-06 21:13:36 -05002041 case ISCSI_PARAM_CONN_ADDRESS:
2042 mutex_lock(&conn->xmitmutex);
Mike Christie5bb0b552006-04-06 21:26:46 -05002043 if (!tcp_conn->sock) {
Mike Christiefd7255f2006-04-06 21:13:36 -05002044 mutex_unlock(&conn->xmitmutex);
2045 return -EINVAL;
2046 }
2047
Mike Christie5bb0b552006-04-06 21:26:46 -05002048 sk = tcp_conn->sock->sk;
Mike Christiefd7255f2006-04-06 21:13:36 -05002049 if (sk->sk_family == PF_INET) {
2050 inet = inet_sk(sk);
2051 len = sprintf(buf, "%u.%u.%u.%u\n",
2052 NIPQUAD(inet->daddr));
2053 } else {
2054 np = inet6_sk(sk);
2055 len = sprintf(buf,
2056 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
2057 NIP6(np->daddr));
2058 }
2059 mutex_unlock(&conn->xmitmutex);
2060 break;
2061 default:
Mike Christie5c75b7f2006-06-28 12:00:26 -05002062 return iscsi_conn_get_param(cls_conn, param, buf);
Mike Christiefd7255f2006-04-06 21:13:36 -05002063 }
2064
2065 return len;
2066}
2067
Alex Aizman7ba24712005-08-04 19:30:08 -07002068static void
Mike Christie7b7232f2006-02-01 21:06:49 -06002069iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
Alex Aizman7ba24712005-08-04 19:30:08 -07002070{
Mike Christie7b7232f2006-02-01 21:06:49 -06002071 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie5bb0b552006-04-06 21:26:46 -05002072 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
Alex Aizman7ba24712005-08-04 19:30:08 -07002073
2074 stats->txdata_octets = conn->txdata_octets;
2075 stats->rxdata_octets = conn->rxdata_octets;
2076 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2077 stats->dataout_pdus = conn->dataout_pdus_cnt;
2078 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2079 stats->datain_pdus = conn->datain_pdus_cnt;
2080 stats->r2t_pdus = conn->r2t_pdus_cnt;
2081 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2082 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2083 stats->custom_length = 3;
2084 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
Mike Christie5bb0b552006-04-06 21:26:46 -05002085 stats->custom[0].value = tcp_conn->sendpage_failures_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -07002086 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
Mike Christie5bb0b552006-04-06 21:26:46 -05002087 stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt;
Alex Aizman7ba24712005-08-04 19:30:08 -07002088 strcpy(stats->custom[2].desc, "eh_abort_cnt");
2089 stats->custom[2].value = conn->eh_abort_cnt;
2090}
2091
Mike Christie5bb0b552006-04-06 21:26:46 -05002092static struct iscsi_cls_session *
2093iscsi_tcp_session_create(struct iscsi_transport *iscsit,
2094 struct scsi_transport_template *scsit,
2095 uint32_t initial_cmdsn, uint32_t *hostno)
Alex Aizman7ba24712005-08-04 19:30:08 -07002096{
Mike Christie5bb0b552006-04-06 21:26:46 -05002097 struct iscsi_cls_session *cls_session;
2098 struct iscsi_session *session;
2099 uint32_t hn;
2100 int cmd_i;
Alex Aizman7ba24712005-08-04 19:30:08 -07002101
Mike Christie5bb0b552006-04-06 21:26:46 -05002102 cls_session = iscsi_session_setup(iscsit, scsit,
2103 sizeof(struct iscsi_tcp_cmd_task),
2104 sizeof(struct iscsi_tcp_mgmt_task),
2105 initial_cmdsn, &hn);
2106 if (!cls_session)
2107 return NULL;
2108 *hostno = hn;
Alex Aizman7ba24712005-08-04 19:30:08 -07002109
Mike Christie5bb0b552006-04-06 21:26:46 -05002110 session = class_to_transport_session(cls_session);
2111 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2112 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
2113 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2114
2115 ctask->hdr = &tcp_ctask->hdr;
2116 }
2117
2118 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
2119 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
2120 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
2121
2122 mtask->hdr = &tcp_mtask->hdr;
2123 }
2124
2125 if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
2126 goto r2tpool_alloc_fail;
2127
2128 return cls_session;
2129
2130r2tpool_alloc_fail:
2131 iscsi_session_teardown(cls_session);
2132 return NULL;
Alex Aizman7ba24712005-08-04 19:30:08 -07002133}
2134
Mike Christie5bb0b552006-04-06 21:26:46 -05002135static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
2136{
Mike Christie5bb0b552006-04-06 21:26:46 -05002137 iscsi_r2tpool_free(class_to_transport_session(cls_session));
2138 iscsi_session_teardown(cls_session);
2139}
2140
2141static struct scsi_host_template iscsi_sht = {
Mike Christief4246b32006-07-24 15:47:54 -05002142 .name = "iSCSI Initiator over TCP/IP",
Mike Christie5bb0b552006-04-06 21:26:46 -05002143 .queuecommand = iscsi_queuecommand,
2144 .change_queue_depth = iscsi_change_queue_depth,
2145 .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
2146 .sg_tablesize = ISCSI_SG_TABLESIZE,
2147 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
2148 .eh_abort_handler = iscsi_eh_abort,
2149 .eh_host_reset_handler = iscsi_eh_host_reset,
2150 .use_clustering = DISABLE_CLUSTERING,
2151 .proc_name = "iscsi_tcp",
2152 .this_id = -1,
2153};
2154
Alex Aizman7ba24712005-08-04 19:30:08 -07002155static struct iscsi_transport iscsi_tcp_transport = {
2156 .owner = THIS_MODULE,
2157 .name = "tcp",
2158 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
2159 | CAP_DATADGST,
Mike Christiefd7255f2006-04-06 21:13:36 -05002160 .param_mask = ISCSI_MAX_RECV_DLENGTH |
2161 ISCSI_MAX_XMIT_DLENGTH |
2162 ISCSI_HDRDGST_EN |
2163 ISCSI_DATADGST_EN |
2164 ISCSI_INITIAL_R2T_EN |
2165 ISCSI_MAX_R2T |
2166 ISCSI_IMM_DATA_EN |
2167 ISCSI_FIRST_BURST |
2168 ISCSI_MAX_BURST |
2169 ISCSI_PDU_INORDER_EN |
2170 ISCSI_DATASEQ_INORDER_EN |
2171 ISCSI_ERL |
2172 ISCSI_CONN_PORT |
Mike Christie8d2860b2006-05-02 19:46:47 -05002173 ISCSI_CONN_ADDRESS |
Mike Christie5c75b7f2006-06-28 12:00:26 -05002174 ISCSI_EXP_STATSN |
2175 ISCSI_PERSISTENT_PORT |
2176 ISCSI_PERSISTENT_ADDRESS |
2177 ISCSI_TARGET_NAME |
2178 ISCSI_TPGT,
Alex Aizman7ba24712005-08-04 19:30:08 -07002179 .host_template = &iscsi_sht,
Mike Christie7b8631b2006-01-13 18:05:50 -06002180 .conndata_size = sizeof(struct iscsi_conn),
Alex Aizman7ba24712005-08-04 19:30:08 -07002181 .max_conn = 1,
2182 .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
Mike Christie5bb0b552006-04-06 21:26:46 -05002183 /* session management */
2184 .create_session = iscsi_tcp_session_create,
2185 .destroy_session = iscsi_tcp_session_destroy,
2186 /* connection management */
2187 .create_conn = iscsi_tcp_conn_create,
2188 .bind_conn = iscsi_tcp_conn_bind,
2189 .destroy_conn = iscsi_tcp_conn_destroy,
Alex Aizman7ba24712005-08-04 19:30:08 -07002190 .set_param = iscsi_conn_set_param,
Mike Christie5c75b7f2006-06-28 12:00:26 -05002191 .get_conn_param = iscsi_tcp_conn_get_param,
Mike Christie7b8631b2006-01-13 18:05:50 -06002192 .get_session_param = iscsi_session_get_param,
Alex Aizman7ba24712005-08-04 19:30:08 -07002193 .start_conn = iscsi_conn_start,
Mike Christie1c834692006-07-24 15:47:26 -05002194 .stop_conn = iscsi_tcp_conn_stop,
Mike Christie5bb0b552006-04-06 21:26:46 -05002195 /* IO */
Alex Aizman7ba24712005-08-04 19:30:08 -07002196 .send_pdu = iscsi_conn_send_pdu,
2197 .get_stats = iscsi_conn_get_stats,
Mike Christie5bb0b552006-04-06 21:26:46 -05002198 .init_cmd_task = iscsi_tcp_cmd_init,
2199 .init_mgmt_task = iscsi_tcp_mgmt_init,
2200 .xmit_cmd_task = iscsi_tcp_ctask_xmit,
2201 .xmit_mgmt_task = iscsi_tcp_mtask_xmit,
2202 .cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
2203 /* recovery */
Mike Christie30a6c652006-04-06 21:13:39 -05002204 .session_recovery_timedout = iscsi_session_recovery_timedout,
Alex Aizman7ba24712005-08-04 19:30:08 -07002205};
2206
2207static int __init
2208iscsi_tcp_init(void)
2209{
Alex Aizman7ba24712005-08-04 19:30:08 -07002210 if (iscsi_max_lun < 1) {
Or Gerlitzbe2df722006-05-02 19:46:43 -05002211 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
2212 iscsi_max_lun);
Alex Aizman7ba24712005-08-04 19:30:08 -07002213 return -EINVAL;
2214 }
2215 iscsi_tcp_transport.max_lun = iscsi_max_lun;
2216
Mike Christie7b8631b2006-01-13 18:05:50 -06002217 if (!iscsi_register_transport(&iscsi_tcp_transport))
Mike Christieffbfe922006-05-18 20:31:36 -05002218 return -ENODEV;
Alex Aizman7ba24712005-08-04 19:30:08 -07002219
Mike Christie7b8631b2006-01-13 18:05:50 -06002220 return 0;
Alex Aizman7ba24712005-08-04 19:30:08 -07002221}
2222
2223static void __exit
2224iscsi_tcp_exit(void)
2225{
2226 iscsi_unregister_transport(&iscsi_tcp_transport);
Alex Aizman7ba24712005-08-04 19:30:08 -07002227}
2228
2229module_init(iscsi_tcp_init);
2230module_exit(iscsi_tcp_exit);