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7ba24713 AA |
1 | /* |
2 | * iSCSI Initiator over TCP/IP Data-Path | |
3 | * | |
4 | * Copyright (C) 2004 Dmitry Yusupov | |
5 | * Copyright (C) 2004 Alex Aizman | |
5bb0b55a MC |
6 | * Copyright (C) 2005 - 2006 Mike Christie |
7 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
7ba24713 AA |
8 | * maintained by open-iscsi@googlegroups.com |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published | |
12 | * by the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * See the file COPYING included with this distribution for more details. | |
21 | * | |
22 | * Credits: | |
23 | * Christoph Hellwig | |
24 | * FUJITA Tomonori | |
25 | * Arne Redlich | |
26 | * Zhenyu Wang | |
27 | */ | |
28 | ||
29 | #include <linux/types.h> | |
30 | #include <linux/list.h> | |
31 | #include <linux/inet.h> | |
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> | |
0b950672 | 37 | #include <linux/mutex.h> |
7ba24713 AA |
38 | #include <net/tcp.h> |
39 | #include <scsi/scsi_cmnd.h> | |
7ba24713 AA |
40 | #include <scsi/scsi_host.h> |
41 | #include <scsi/scsi.h> | |
42 | #include <scsi/scsi_transport_iscsi.h> | |
43 | ||
44 | #include "iscsi_tcp.h" | |
45 | ||
f70e9c5f | 46 | #define ISCSI_TCP_VERSION "1.0-595" |
e0ecae8d | 47 | |
7ba24713 AA |
48 | MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, " |
49 | "Alex Aizman <itn780@yahoo.com>"); | |
50 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
51 | MODULE_LICENSE("GPL"); | |
e0ecae8d | 52 | MODULE_VERSION(ISCSI_TCP_VERSION); |
7ba24713 | 53 | /* #define DEBUG_TCP */ |
7ba24713 AA |
54 | #define DEBUG_ASSERT |
55 | ||
56 | #ifdef DEBUG_TCP | |
5bb0b55a | 57 | #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) |
7ba24713 AA |
58 | #else |
59 | #define debug_tcp(fmt...) | |
60 | #endif | |
61 | ||
7ba24713 AA |
62 | #ifndef DEBUG_ASSERT |
63 | #ifdef BUG_ON | |
64 | #undef BUG_ON | |
65 | #endif | |
66 | #define BUG_ON(expr) | |
67 | #endif | |
68 | ||
7ba24713 AA |
69 | static unsigned int iscsi_max_lun = 512; |
70 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
71 | ||
7ba24713 AA |
72 | static inline void |
73 | iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size) | |
74 | { | |
7cae5159 MC |
75 | ibuf->sg.page = virt_to_page(vbuf); |
76 | ibuf->sg.offset = offset_in_page(vbuf); | |
7ba24713 AA |
77 | ibuf->sg.length = size; |
78 | ibuf->sent = 0; | |
7cae5159 | 79 | ibuf->use_sendmsg = 1; |
7ba24713 AA |
80 | } |
81 | ||
82 | static inline void | |
83 | iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg) | |
84 | { | |
7cae5159 MC |
85 | ibuf->sg.page = sg->page; |
86 | ibuf->sg.offset = sg->offset; | |
87 | ibuf->sg.length = sg->length; | |
7ba24713 AA |
88 | /* |
89 | * Fastpath: sg element fits into single page | |
90 | */ | |
a1e80c20 | 91 | if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page)) |
7cae5159 MC |
92 | ibuf->use_sendmsg = 0; |
93 | else | |
94 | ibuf->use_sendmsg = 1; | |
7ba24713 AA |
95 | ibuf->sent = 0; |
96 | } | |
97 | ||
98 | static inline int | |
99 | iscsi_buf_left(struct iscsi_buf *ibuf) | |
100 | { | |
101 | int rc; | |
102 | ||
103 | rc = ibuf->sg.length - ibuf->sent; | |
104 | BUG_ON(rc < 0); | |
105 | return rc; | |
106 | } | |
107 | ||
108 | static inline void | |
af973481 MC |
109 | iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, |
110 | u8* crc) | |
7ba24713 | 111 | { |
5bb0b55a | 112 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 113 | |
5bb0b55a MC |
114 | crypto_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc); |
115 | buf->sg.length += sizeof(uint32_t); | |
7ba24713 AA |
116 | } |
117 | ||
118 | static inline int | |
5bb0b55a | 119 | iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 120 | { |
5bb0b55a | 121 | struct sk_buff *skb = tcp_conn->in.skb; |
7ba24713 | 122 | |
5bb0b55a | 123 | tcp_conn->in.zero_copy_hdr = 0; |
7ba24713 | 124 | |
5bb0b55a MC |
125 | if (tcp_conn->in.copy >= tcp_conn->hdr_size && |
126 | tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) { | |
7ba24713 AA |
127 | /* |
128 | * Zero-copy PDU Header: using connection context | |
129 | * to store header pointer. | |
130 | */ | |
131 | if (skb_shinfo(skb)->frag_list == NULL && | |
5bb0b55a MC |
132 | !skb_shinfo(skb)->nr_frags) { |
133 | tcp_conn->in.hdr = (struct iscsi_hdr *) | |
134 | ((char*)skb->data + tcp_conn->in.offset); | |
135 | tcp_conn->in.zero_copy_hdr = 1; | |
136 | } else { | |
7ba24713 AA |
137 | /* ignoring return code since we checked |
138 | * in.copy before */ | |
5bb0b55a MC |
139 | skb_copy_bits(skb, tcp_conn->in.offset, |
140 | &tcp_conn->hdr, tcp_conn->hdr_size); | |
141 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
7ba24713 | 142 | } |
5bb0b55a MC |
143 | tcp_conn->in.offset += tcp_conn->hdr_size; |
144 | tcp_conn->in.copy -= tcp_conn->hdr_size; | |
7ba24713 AA |
145 | } else { |
146 | int hdr_remains; | |
147 | int copylen; | |
148 | ||
149 | /* | |
150 | * PDU header scattered across SKB's, | |
151 | * copying it... This'll happen quite rarely. | |
152 | */ | |
153 | ||
5bb0b55a MC |
154 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) |
155 | tcp_conn->in.hdr_offset = 0; | |
7ba24713 | 156 | |
5bb0b55a | 157 | hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset; |
7ba24713 AA |
158 | BUG_ON(hdr_remains <= 0); |
159 | ||
5bb0b55a MC |
160 | copylen = min(tcp_conn->in.copy, hdr_remains); |
161 | skb_copy_bits(skb, tcp_conn->in.offset, | |
162 | (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset, | |
163 | copylen); | |
7ba24713 AA |
164 | |
165 | debug_tcp("PDU gather offset %d bytes %d in.offset %d " | |
5bb0b55a MC |
166 | "in.copy %d\n", tcp_conn->in.hdr_offset, copylen, |
167 | tcp_conn->in.offset, tcp_conn->in.copy); | |
7ba24713 | 168 | |
5bb0b55a MC |
169 | tcp_conn->in.offset += copylen; |
170 | tcp_conn->in.copy -= copylen; | |
7ba24713 | 171 | if (copylen < hdr_remains) { |
5bb0b55a MC |
172 | tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER; |
173 | tcp_conn->in.hdr_offset += copylen; | |
7ba24713 AA |
174 | return -EAGAIN; |
175 | } | |
5bb0b55a MC |
176 | tcp_conn->in.hdr = &tcp_conn->hdr; |
177 | tcp_conn->discontiguous_hdr_cnt++; | |
178 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
179 | } |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
30a6c652 MC |
184 | /* |
185 | * must be called with session lock | |
186 | */ | |
187 | static void | |
b6c395ed | 188 | iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 189 | { |
5bb0b55a | 190 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
b6c395ed | 191 | struct iscsi_r2t_info *r2t; |
30a6c652 | 192 | struct scsi_cmnd *sc; |
7ba24713 | 193 | |
b6c395ed MC |
194 | /* flush ctask's r2t queues */ |
195 | while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { | |
196 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
197 | sizeof(void*)); | |
198 | debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n"); | |
199 | } | |
200 | ||
30a6c652 MC |
201 | sc = ctask->sc; |
202 | if (unlikely(!sc)) | |
7ba24713 | 203 | return; |
30a6c652 | 204 | |
5bb0b55a MC |
205 | tcp_ctask->xmstate = XMSTATE_IDLE; |
206 | tcp_ctask->r2t = NULL; | |
7ba24713 AA |
207 | } |
208 | ||
209 | /** | |
210 | * iscsi_data_rsp - SCSI Data-In Response processing | |
211 | * @conn: iscsi connection | |
212 | * @ctask: scsi command task | |
213 | **/ | |
214 | static int | |
215 | iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
216 | { | |
217 | int rc; | |
5bb0b55a MC |
218 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
219 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
220 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
7ba24713 AA |
221 | struct iscsi_session *session = conn->session; |
222 | int datasn = be32_to_cpu(rhdr->datasn); | |
223 | ||
224 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
225 | if (rc) | |
226 | return rc; | |
227 | /* | |
228 | * setup Data-In byte counter (gets decremented..) | |
229 | */ | |
5bb0b55a | 230 | ctask->data_count = tcp_conn->in.datalen; |
7ba24713 | 231 | |
5bb0b55a | 232 | if (tcp_conn->in.datalen == 0) |
7ba24713 AA |
233 | return 0; |
234 | ||
235 | if (ctask->datasn != datasn) | |
236 | return ISCSI_ERR_DATASN; | |
237 | ||
238 | ctask->datasn++; | |
239 | ||
5bb0b55a MC |
240 | tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); |
241 | if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length) | |
7ba24713 AA |
242 | return ISCSI_ERR_DATA_OFFSET; |
243 | ||
244 | if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
245 | struct scsi_cmnd *sc = ctask->sc; | |
246 | ||
247 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
bf310b8f | 248 | if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) { |
7ba24713 AA |
249 | int res_count = be32_to_cpu(rhdr->residual_count); |
250 | ||
251 | if (res_count > 0 && | |
252 | res_count <= sc->request_bufflen) { | |
253 | sc->resid = res_count; | |
254 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
255 | } else | |
256 | sc->result = (DID_BAD_TARGET << 16) | | |
257 | rhdr->cmd_status; | |
bf310b8f | 258 | } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) { |
7ba24713 AA |
259 | sc->resid = be32_to_cpu(rhdr->residual_count); |
260 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
261 | } else | |
262 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
263 | } | |
264 | ||
265 | conn->datain_pdus_cnt++; | |
266 | return 0; | |
267 | } | |
268 | ||
269 | /** | |
270 | * iscsi_solicit_data_init - initialize first Data-Out | |
271 | * @conn: iscsi connection | |
272 | * @ctask: scsi command task | |
273 | * @r2t: R2T info | |
274 | * | |
275 | * Notes: | |
276 | * Initialize first Data-Out within this R2T sequence and finds | |
277 | * proper data_offset within this SCSI command. | |
278 | * | |
279 | * This function is called with connection lock taken. | |
280 | **/ | |
281 | static void | |
282 | iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
283 | struct iscsi_r2t_info *r2t) | |
284 | { | |
285 | struct iscsi_data *hdr; | |
7ba24713 | 286 | struct scsi_cmnd *sc = ctask->sc; |
5bb0b55a | 287 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 288 | |
ffbfe925 | 289 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
290 | memset(hdr, 0, sizeof(struct iscsi_data)); |
291 | hdr->ttt = r2t->ttt; | |
292 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
293 | r2t->solicit_datasn++; | |
294 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
295 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
296 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
297 | hdr->exp_statsn = r2t->exp_statsn; |
298 | hdr->offset = cpu_to_be32(r2t->data_offset); | |
299 | if (r2t->data_length > conn->max_xmit_dlength) { | |
300 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
301 | r2t->data_count = conn->max_xmit_dlength; | |
302 | hdr->flags = 0; | |
303 | } else { | |
304 | hton24(hdr->dlength, r2t->data_length); | |
305 | r2t->data_count = r2t->data_length; | |
306 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
307 | } | |
308 | conn->dataout_pdus_cnt++; | |
309 | ||
310 | r2t->sent = 0; | |
311 | ||
6e458cc9 | 312 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 313 | sizeof(struct iscsi_hdr)); |
7ba24713 | 314 | |
7ba24713 AA |
315 | if (sc->use_sg) { |
316 | int i, sg_count = 0; | |
317 | struct scatterlist *sg = sc->request_buffer; | |
318 | ||
319 | r2t->sg = NULL; | |
320 | for (i = 0; i < sc->use_sg; i++, sg += 1) { | |
321 | /* FIXME: prefetch ? */ | |
322 | if (sg_count + sg->length > r2t->data_offset) { | |
323 | int page_offset; | |
324 | ||
325 | /* sg page found! */ | |
326 | ||
327 | /* offset within this page */ | |
328 | page_offset = r2t->data_offset - sg_count; | |
329 | ||
330 | /* fill in this buffer */ | |
331 | iscsi_buf_init_sg(&r2t->sendbuf, sg); | |
332 | r2t->sendbuf.sg.offset += page_offset; | |
333 | r2t->sendbuf.sg.length -= page_offset; | |
334 | ||
335 | /* xmit logic will continue with next one */ | |
336 | r2t->sg = sg + 1; | |
337 | break; | |
338 | } | |
339 | sg_count += sg->length; | |
340 | } | |
341 | BUG_ON(r2t->sg == NULL); | |
342 | } else | |
5bb0b55a | 343 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
7ba24713 AA |
344 | (char*)sc->request_buffer + r2t->data_offset, |
345 | r2t->data_count); | |
7ba24713 AA |
346 | } |
347 | ||
348 | /** | |
349 | * iscsi_r2t_rsp - iSCSI R2T Response processing | |
350 | * @conn: iscsi connection | |
351 | * @ctask: scsi command task | |
352 | **/ | |
353 | static int | |
354 | iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
355 | { | |
356 | struct iscsi_r2t_info *r2t; | |
357 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
358 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
359 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
360 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
7ba24713 AA |
361 | int r2tsn = be32_to_cpu(rhdr->r2tsn); |
362 | int rc; | |
363 | ||
5bb0b55a | 364 | if (tcp_conn->in.datalen) |
7ba24713 AA |
365 | return ISCSI_ERR_DATALEN; |
366 | ||
5bb0b55a | 367 | if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn) |
7ba24713 AA |
368 | return ISCSI_ERR_R2TSN; |
369 | ||
370 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
371 | if (rc) | |
372 | return rc; | |
373 | ||
374 | /* FIXME: use R2TSN to detect missing R2T */ | |
375 | ||
376 | /* fill-in new R2T associated with the task */ | |
377 | spin_lock(&session->lock); | |
378 | if (!ctask->sc || ctask->mtask || | |
379 | session->state != ISCSI_STATE_LOGGED_IN) { | |
380 | printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " | |
381 | "recovery...\n", ctask->itt); | |
382 | spin_unlock(&session->lock); | |
383 | return 0; | |
384 | } | |
b6c395ed | 385 | |
5bb0b55a | 386 | rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 AA |
387 | BUG_ON(!rc); |
388 | ||
389 | r2t->exp_statsn = rhdr->statsn; | |
390 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
391 | if (r2t->data_length == 0 || | |
392 | r2t->data_length > session->max_burst) { | |
393 | spin_unlock(&session->lock); | |
394 | return ISCSI_ERR_DATALEN; | |
395 | } | |
396 | ||
397 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); | |
398 | if (r2t->data_offset + r2t->data_length > ctask->total_length) { | |
399 | spin_unlock(&session->lock); | |
400 | return ISCSI_ERR_DATALEN; | |
401 | } | |
402 | ||
403 | r2t->ttt = rhdr->ttt; /* no flip */ | |
404 | r2t->solicit_datasn = 0; | |
405 | ||
406 | iscsi_solicit_data_init(conn, ctask, r2t); | |
407 | ||
5bb0b55a MC |
408 | tcp_ctask->exp_r2tsn = r2tsn + 1; |
409 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
410 | __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); | |
b6c395ed | 411 | list_move_tail(&ctask->running, &conn->xmitqueue); |
7ba24713 | 412 | |
55e3299d | 413 | scsi_queue_work(session->host, &conn->xmitwork); |
7ba24713 AA |
414 | conn->r2t_pdus_cnt++; |
415 | spin_unlock(&session->lock); | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | static int | |
5bb0b55a | 421 | iscsi_tcp_hdr_recv(struct iscsi_conn *conn) |
7ba24713 | 422 | { |
5bb0b55a | 423 | int rc = 0, opcode, ahslen; |
7ba24713 | 424 | struct iscsi_hdr *hdr; |
7ba24713 | 425 | struct iscsi_session *session = conn->session; |
5bb0b55a MC |
426 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
427 | uint32_t cdgst, rdgst = 0, itt; | |
7ba24713 | 428 | |
5bb0b55a | 429 | hdr = tcp_conn->in.hdr; |
7ba24713 AA |
430 | |
431 | /* verify PDU length */ | |
5bb0b55a MC |
432 | tcp_conn->in.datalen = ntoh24(hdr->dlength); |
433 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
7ba24713 | 434 | printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", |
5bb0b55a | 435 | tcp_conn->in.datalen, conn->max_recv_dlength); |
7ba24713 AA |
436 | return ISCSI_ERR_DATALEN; |
437 | } | |
5bb0b55a | 438 | tcp_conn->data_copied = 0; |
7ba24713 AA |
439 | |
440 | /* read AHS */ | |
5bb0b55a MC |
441 | ahslen = hdr->hlength << 2; |
442 | tcp_conn->in.offset += ahslen; | |
443 | tcp_conn->in.copy -= ahslen; | |
444 | if (tcp_conn->in.copy < 0) { | |
7ba24713 | 445 | printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " |
5bb0b55a | 446 | "%d bytes\n", ahslen); |
7ba24713 AA |
447 | return ISCSI_ERR_AHSLEN; |
448 | } | |
449 | ||
450 | /* calculate read padding */ | |
5bb0b55a MC |
451 | tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1); |
452 | if (tcp_conn->in.padding) { | |
453 | tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding; | |
454 | debug_scsi("read padding %d bytes\n", tcp_conn->in.padding); | |
7ba24713 AA |
455 | } |
456 | ||
457 | if (conn->hdrdgst_en) { | |
458 | struct scatterlist sg; | |
459 | ||
460 | sg_init_one(&sg, (u8 *)hdr, | |
5bb0b55a MC |
461 | sizeof(struct iscsi_hdr) + ahslen); |
462 | crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst); | |
7ba24713 | 463 | rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + |
5bb0b55a | 464 | ahslen); |
8a47cd34 | 465 | if (cdgst != rdgst) { |
5bb0b55a MC |
466 | printk(KERN_ERR "iscsi_tcp: hdrdgst error " |
467 | "recv 0x%x calc 0x%x\n", rdgst, cdgst); | |
8a47cd34 MC |
468 | return ISCSI_ERR_HDR_DGST; |
469 | } | |
7ba24713 AA |
470 | } |
471 | ||
5bb0b55a | 472 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
7ba24713 | 473 | /* verify itt (itt encoding: age+cid+itt) */ |
5bb0b55a MC |
474 | rc = iscsi_verify_itt(conn, hdr, &itt); |
475 | if (rc == ISCSI_ERR_NO_SCSI_CMD) { | |
476 | tcp_conn->in.datalen = 0; /* force drop */ | |
477 | return 0; | |
478 | } else if (rc) | |
479 | return rc; | |
7ba24713 AA |
480 | |
481 | debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", | |
5bb0b55a MC |
482 | opcode, tcp_conn->in.offset, tcp_conn->in.copy, |
483 | ahslen, tcp_conn->in.datalen); | |
7ba24713 | 484 | |
5bb0b55a MC |
485 | switch(opcode) { |
486 | case ISCSI_OP_SCSI_DATA_IN: | |
487 | tcp_conn->in.ctask = session->cmds[itt]; | |
488 | rc = iscsi_data_rsp(conn, tcp_conn->in.ctask); | |
489 | /* fall through */ | |
490 | case ISCSI_OP_SCSI_CMD_RSP: | |
491 | tcp_conn->in.ctask = session->cmds[itt]; | |
492 | if (tcp_conn->in.datalen) | |
493 | goto copy_hdr; | |
7ba24713 | 494 | |
5bb0b55a | 495 | spin_lock(&session->lock); |
b6c395ed | 496 | iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask); |
5bb0b55a MC |
497 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); |
498 | spin_unlock(&session->lock); | |
499 | break; | |
500 | case ISCSI_OP_R2T: | |
501 | tcp_conn->in.ctask = session->cmds[itt]; | |
502 | if (ahslen) | |
503 | rc = ISCSI_ERR_AHSLEN; | |
504 | else if (tcp_conn->in.ctask->sc->sc_data_direction == | |
505 | DMA_TO_DEVICE) | |
506 | rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); | |
507 | else | |
508 | rc = ISCSI_ERR_PROTO; | |
509 | break; | |
510 | case ISCSI_OP_LOGIN_RSP: | |
511 | case ISCSI_OP_TEXT_RSP: | |
512 | case ISCSI_OP_LOGOUT_RSP: | |
513 | case ISCSI_OP_NOOP_IN: | |
514 | case ISCSI_OP_REJECT: | |
515 | case ISCSI_OP_ASYNC_EVENT: | |
516 | if (tcp_conn->in.datalen) | |
517 | goto copy_hdr; | |
518 | /* fall through */ | |
519 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
520 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
521 | break; | |
522 | default: | |
523 | rc = ISCSI_ERR_BAD_OPCODE; | |
524 | break; | |
525 | } | |
7ba24713 AA |
526 | |
527 | return rc; | |
5bb0b55a MC |
528 | |
529 | copy_hdr: | |
530 | /* | |
531 | * if we did zero copy for the header but we will need multiple | |
532 | * skbs to complete the command then we have to copy the header | |
533 | * for later use | |
534 | */ | |
535 | if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy < | |
536 | (tcp_conn->in.datalen + tcp_conn->in.padding + | |
537 | (conn->datadgst_en ? 4 : 0))) { | |
538 | debug_tcp("Copying header for later use. in.copy %d in.datalen" | |
539 | " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); | |
540 | memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, | |
541 | sizeof(struct iscsi_hdr)); | |
542 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
543 | tcp_conn->in.zero_copy_hdr = 0; | |
544 | } | |
545 | return 0; | |
7ba24713 AA |
546 | } |
547 | ||
548 | /** | |
549 | * iscsi_ctask_copy - copy skb bits to the destanation cmd task | |
5bb0b55a | 550 | * @conn: iscsi tcp connection |
7ba24713 AA |
551 | * @ctask: scsi command task |
552 | * @buf: buffer to copy to | |
553 | * @buf_size: size of buffer | |
554 | * @offset: offset within the buffer | |
555 | * | |
556 | * Notes: | |
557 | * The function calls skb_copy_bits() and updates per-connection and | |
558 | * per-cmd byte counters. | |
559 | * | |
560 | * Read counters (in bytes): | |
561 | * | |
562 | * conn->in.offset offset within in progress SKB | |
563 | * conn->in.copy left to copy from in progress SKB | |
564 | * including padding | |
565 | * conn->in.copied copied already from in progress SKB | |
566 | * conn->data_copied copied already from in progress buffer | |
567 | * ctask->sent total bytes sent up to the MidLayer | |
568 | * ctask->data_count left to copy from in progress Data-In | |
569 | * buf_left left to copy from in progress buffer | |
570 | **/ | |
571 | static inline int | |
5bb0b55a | 572 | iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, |
7ba24713 AA |
573 | void *buf, int buf_size, int offset) |
574 | { | |
5bb0b55a MC |
575 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
576 | int buf_left = buf_size - (tcp_conn->data_copied + offset); | |
577 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
578 | int rc; |
579 | ||
580 | size = min(size, ctask->data_count); | |
581 | ||
582 | debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 583 | size, tcp_conn->in.offset, tcp_conn->in.copied); |
7ba24713 AA |
584 | |
585 | BUG_ON(size <= 0); | |
5bb0b55a | 586 | BUG_ON(tcp_ctask->sent + size > ctask->total_length); |
7ba24713 | 587 | |
5bb0b55a MC |
588 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
589 | (char*)buf + (offset + tcp_conn->data_copied), size); | |
7ba24713 AA |
590 | /* must fit into skb->len */ |
591 | BUG_ON(rc); | |
592 | ||
5bb0b55a MC |
593 | tcp_conn->in.offset += size; |
594 | tcp_conn->in.copy -= size; | |
595 | tcp_conn->in.copied += size; | |
596 | tcp_conn->data_copied += size; | |
597 | tcp_ctask->sent += size; | |
7ba24713 AA |
598 | ctask->data_count -= size; |
599 | ||
5bb0b55a | 600 | BUG_ON(tcp_conn->in.copy < 0); |
7ba24713 AA |
601 | BUG_ON(ctask->data_count < 0); |
602 | ||
5bb0b55a | 603 | if (buf_size != (tcp_conn->data_copied + offset)) { |
7ba24713 | 604 | if (!ctask->data_count) { |
5bb0b55a | 605 | BUG_ON(buf_size - tcp_conn->data_copied < 0); |
7ba24713 | 606 | /* done with this PDU */ |
5bb0b55a | 607 | return buf_size - tcp_conn->data_copied; |
7ba24713 AA |
608 | } |
609 | return -EAGAIN; | |
610 | } | |
611 | ||
612 | /* done with this buffer or with both - PDU and buffer */ | |
5bb0b55a | 613 | tcp_conn->data_copied = 0; |
7ba24713 AA |
614 | return 0; |
615 | } | |
616 | ||
617 | /** | |
618 | * iscsi_tcp_copy - copy skb bits to the destanation buffer | |
5bb0b55a | 619 | * @conn: iscsi tcp connection |
7ba24713 AA |
620 | * |
621 | * Notes: | |
622 | * The function calls skb_copy_bits() and updates per-connection | |
623 | * byte counters. | |
624 | **/ | |
625 | static inline int | |
5bb0b55a | 626 | iscsi_tcp_copy(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 627 | { |
5bb0b55a MC |
628 | void *buf = tcp_conn->data; |
629 | int buf_size = tcp_conn->in.datalen; | |
630 | int buf_left = buf_size - tcp_conn->data_copied; | |
631 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
632 | int rc; |
633 | ||
634 | debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 635 | size, tcp_conn->in.offset, tcp_conn->data_copied); |
7ba24713 AA |
636 | BUG_ON(size <= 0); |
637 | ||
5bb0b55a MC |
638 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
639 | (char*)buf + tcp_conn->data_copied, size); | |
7ba24713 AA |
640 | BUG_ON(rc); |
641 | ||
5bb0b55a MC |
642 | tcp_conn->in.offset += size; |
643 | tcp_conn->in.copy -= size; | |
644 | tcp_conn->in.copied += size; | |
645 | tcp_conn->data_copied += size; | |
7ba24713 | 646 | |
5bb0b55a | 647 | if (buf_size != tcp_conn->data_copied) |
7ba24713 AA |
648 | return -EAGAIN; |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
653 | static inline void | |
5bb0b55a MC |
654 | partial_sg_digest_update(struct iscsi_tcp_conn *tcp_conn, |
655 | struct scatterlist *sg, int offset, int length) | |
7ba24713 AA |
656 | { |
657 | struct scatterlist temp; | |
658 | ||
659 | memcpy(&temp, sg, sizeof(struct scatterlist)); | |
660 | temp.offset = offset; | |
661 | temp.length = length; | |
5bb0b55a | 662 | crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1); |
7ba24713 AA |
663 | } |
664 | ||
f6cfba1d | 665 | static void |
5bb0b55a | 666 | iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) |
f6cfba1d MC |
667 | { |
668 | struct scatterlist tmp; | |
669 | ||
670 | sg_init_one(&tmp, buf, len); | |
5bb0b55a | 671 | crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1); |
f6cfba1d MC |
672 | } |
673 | ||
7ba24713 AA |
674 | static int iscsi_scsi_data_in(struct iscsi_conn *conn) |
675 | { | |
5bb0b55a MC |
676 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
677 | struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; | |
678 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 679 | struct scsi_cmnd *sc = ctask->sc; |
f6cfba1d | 680 | struct scatterlist *sg; |
7ba24713 AA |
681 | int i, offset, rc = 0; |
682 | ||
683 | BUG_ON((void*)ctask != sc->SCp.ptr); | |
684 | ||
685 | /* | |
686 | * copying Data-In into the Scsi_Cmnd | |
687 | */ | |
688 | if (!sc->use_sg) { | |
689 | i = ctask->data_count; | |
5bb0b55a MC |
690 | rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, |
691 | sc->request_bufflen, | |
692 | tcp_ctask->data_offset); | |
7ba24713 AA |
693 | if (rc == -EAGAIN) |
694 | return rc; | |
42f72aa9 | 695 | if (conn->datadgst_en) |
5bb0b55a MC |
696 | iscsi_recv_digest_update(tcp_conn, sc->request_buffer, |
697 | i); | |
7ba24713 AA |
698 | rc = 0; |
699 | goto done; | |
700 | } | |
701 | ||
5bb0b55a | 702 | offset = tcp_ctask->data_offset; |
7ba24713 AA |
703 | sg = sc->request_buffer; |
704 | ||
5bb0b55a MC |
705 | if (tcp_ctask->data_offset) |
706 | for (i = 0; i < tcp_ctask->sg_count; i++) | |
7ba24713 AA |
707 | offset -= sg[i].length; |
708 | /* we've passed through partial sg*/ | |
709 | if (offset < 0) | |
710 | offset = 0; | |
711 | ||
5bb0b55a | 712 | for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { |
7ba24713 AA |
713 | char *dest; |
714 | ||
715 | dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); | |
5bb0b55a | 716 | rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, |
7ba24713 AA |
717 | sg[i].length, offset); |
718 | kunmap_atomic(dest, KM_SOFTIRQ0); | |
719 | if (rc == -EAGAIN) | |
720 | /* continue with the next SKB/PDU */ | |
721 | return rc; | |
722 | if (!rc) { | |
723 | if (conn->datadgst_en) { | |
724 | if (!offset) | |
5bb0b55a MC |
725 | crypto_digest_update( |
726 | tcp_conn->data_rx_tfm, | |
727 | &sg[i], 1); | |
7ba24713 | 728 | else |
5bb0b55a MC |
729 | partial_sg_digest_update(tcp_conn, |
730 | &sg[i], | |
7ba24713 AA |
731 | sg[i].offset + offset, |
732 | sg[i].length - offset); | |
733 | } | |
734 | offset = 0; | |
5bb0b55a | 735 | tcp_ctask->sg_count++; |
7ba24713 AA |
736 | } |
737 | ||
738 | if (!ctask->data_count) { | |
739 | if (rc && conn->datadgst_en) | |
740 | /* | |
741 | * data-in is complete, but buffer not... | |
742 | */ | |
5bb0b55a | 743 | partial_sg_digest_update(tcp_conn, &sg[i], |
7ba24713 AA |
744 | sg[i].offset, sg[i].length-rc); |
745 | rc = 0; | |
746 | break; | |
747 | } | |
748 | ||
5bb0b55a | 749 | if (!tcp_conn->in.copy) |
7ba24713 AA |
750 | return -EAGAIN; |
751 | } | |
752 | BUG_ON(ctask->data_count); | |
753 | ||
754 | done: | |
755 | /* check for non-exceptional status */ | |
5bb0b55a | 756 | if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { |
b6c395ed MC |
757 | debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n", |
758 | (long)sc, sc->result, ctask->itt, | |
759 | tcp_conn->in.hdr->flags); | |
5bb0b55a | 760 | spin_lock(&conn->session->lock); |
b6c395ed | 761 | iscsi_tcp_cleanup_ctask(conn, ctask); |
5bb0b55a MC |
762 | __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); |
763 | spin_unlock(&conn->session->lock); | |
7ba24713 AA |
764 | } |
765 | ||
766 | return rc; | |
767 | } | |
768 | ||
769 | static int | |
770 | iscsi_data_recv(struct iscsi_conn *conn) | |
771 | { | |
5bb0b55a MC |
772 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
773 | int rc = 0, opcode; | |
7ba24713 | 774 | |
5bb0b55a MC |
775 | opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
776 | switch (opcode) { | |
7ba24713 AA |
777 | case ISCSI_OP_SCSI_DATA_IN: |
778 | rc = iscsi_scsi_data_in(conn); | |
779 | break; | |
5bb0b55a MC |
780 | case ISCSI_OP_SCSI_CMD_RSP: |
781 | spin_lock(&conn->session->lock); | |
b6c395ed | 782 | iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask); |
5bb0b55a | 783 | spin_unlock(&conn->session->lock); |
7ba24713 AA |
784 | case ISCSI_OP_TEXT_RSP: |
785 | case ISCSI_OP_LOGIN_RSP: | |
5bb0b55a MC |
786 | case ISCSI_OP_NOOP_IN: |
787 | case ISCSI_OP_ASYNC_EVENT: | |
788 | case ISCSI_OP_REJECT: | |
7ba24713 AA |
789 | /* |
790 | * Collect data segment to the connection's data | |
791 | * placeholder | |
792 | */ | |
5bb0b55a | 793 | if (iscsi_tcp_copy(tcp_conn)) { |
7ba24713 AA |
794 | rc = -EAGAIN; |
795 | goto exit; | |
796 | } | |
797 | ||
5bb0b55a MC |
798 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, tcp_conn->data, |
799 | tcp_conn->in.datalen); | |
800 | if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) | |
801 | iscsi_recv_digest_update(tcp_conn, tcp_conn->data, | |
802 | tcp_conn->in.datalen); | |
803 | break; | |
7ba24713 AA |
804 | default: |
805 | BUG_ON(1); | |
806 | } | |
807 | exit: | |
808 | return rc; | |
809 | } | |
810 | ||
811 | /** | |
812 | * iscsi_tcp_data_recv - TCP receive in sendfile fashion | |
813 | * @rd_desc: read descriptor | |
814 | * @skb: socket buffer | |
815 | * @offset: offset in skb | |
816 | * @len: skb->len - offset | |
817 | **/ | |
818 | static int | |
819 | iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
820 | unsigned int offset, size_t len) | |
821 | { | |
822 | int rc; | |
823 | struct iscsi_conn *conn = rd_desc->arg.data; | |
5bb0b55a | 824 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
825 | int processed; |
826 | char pad[ISCSI_PAD_LEN]; | |
827 | struct scatterlist sg; | |
828 | ||
829 | /* | |
830 | * Save current SKB and its offset in the corresponding | |
831 | * connection context. | |
832 | */ | |
5bb0b55a MC |
833 | tcp_conn->in.copy = skb->len - offset; |
834 | tcp_conn->in.offset = offset; | |
835 | tcp_conn->in.skb = skb; | |
836 | tcp_conn->in.len = tcp_conn->in.copy; | |
837 | BUG_ON(tcp_conn->in.copy <= 0); | |
838 | debug_tcp("in %d bytes\n", tcp_conn->in.copy); | |
7ba24713 AA |
839 | |
840 | more: | |
5bb0b55a | 841 | tcp_conn->in.copied = 0; |
7ba24713 AA |
842 | rc = 0; |
843 | ||
844 | if (unlikely(conn->suspend_rx)) { | |
845 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
846 | return 0; | |
847 | } | |
848 | ||
5bb0b55a MC |
849 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || |
850 | tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { | |
851 | rc = iscsi_hdr_extract(tcp_conn); | |
7ba24713 AA |
852 | if (rc) { |
853 | if (rc == -EAGAIN) | |
854 | goto nomore; | |
855 | else { | |
d82967c7 | 856 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
857 | return 0; |
858 | } | |
859 | } | |
860 | ||
861 | /* | |
862 | * Verify and process incoming PDU header. | |
863 | */ | |
5bb0b55a MC |
864 | rc = iscsi_tcp_hdr_recv(conn); |
865 | if (!rc && tcp_conn->in.datalen) { | |
8a47cd34 | 866 | if (conn->datadgst_en) { |
5bb0b55a MC |
867 | BUG_ON(!tcp_conn->data_rx_tfm); |
868 | crypto_digest_init(tcp_conn->data_rx_tfm); | |
7ba24713 | 869 | } |
5bb0b55a | 870 | tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; |
7ba24713 | 871 | } else if (rc) { |
d82967c7 | 872 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
873 | return 0; |
874 | } | |
875 | } | |
876 | ||
5bb0b55a | 877 | if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { |
f6cfba1d | 878 | uint32_t recv_digest; |
5bb0b55a | 879 | |
7ba24713 | 880 | debug_tcp("extra data_recv offset %d copy %d\n", |
5bb0b55a MC |
881 | tcp_conn->in.offset, tcp_conn->in.copy); |
882 | skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, | |
f6cfba1d | 883 | &recv_digest, 4); |
5bb0b55a MC |
884 | tcp_conn->in.offset += 4; |
885 | tcp_conn->in.copy -= 4; | |
886 | if (recv_digest != tcp_conn->in.datadgst) { | |
f6cfba1d MC |
887 | debug_tcp("iscsi_tcp: data digest error!" |
888 | "0x%x != 0x%x\n", recv_digest, | |
5bb0b55a | 889 | tcp_conn->in.datadgst); |
f6cfba1d MC |
890 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
891 | return 0; | |
892 | } else { | |
893 | debug_tcp("iscsi_tcp: data digest match!" | |
894 | "0x%x == 0x%x\n", recv_digest, | |
5bb0b55a MC |
895 | tcp_conn->in.datadgst); |
896 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
897 | } |
898 | } | |
899 | ||
5bb0b55a MC |
900 | if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && |
901 | tcp_conn->in.copy) { | |
7ba24713 AA |
902 | |
903 | debug_tcp("data_recv offset %d copy %d\n", | |
5bb0b55a | 904 | tcp_conn->in.offset, tcp_conn->in.copy); |
7ba24713 AA |
905 | |
906 | rc = iscsi_data_recv(conn); | |
907 | if (rc) { | |
665b44ae | 908 | if (rc == -EAGAIN) |
7ba24713 | 909 | goto again; |
d82967c7 | 910 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
911 | return 0; |
912 | } | |
5bb0b55a MC |
913 | tcp_conn->in.copy -= tcp_conn->in.padding; |
914 | tcp_conn->in.offset += tcp_conn->in.padding; | |
8a47cd34 | 915 | if (conn->datadgst_en) { |
5bb0b55a MC |
916 | if (tcp_conn->in.padding) { |
917 | debug_tcp("padding -> %d\n", | |
918 | tcp_conn->in.padding); | |
919 | memset(pad, 0, tcp_conn->in.padding); | |
920 | sg_init_one(&sg, pad, tcp_conn->in.padding); | |
921 | crypto_digest_update(tcp_conn->data_rx_tfm, | |
922 | &sg, 1); | |
7ba24713 | 923 | } |
5bb0b55a MC |
924 | crypto_digest_final(tcp_conn->data_rx_tfm, |
925 | (u8 *) & tcp_conn->in.datadgst); | |
926 | debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); | |
927 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; | |
7ba24713 | 928 | } else |
5bb0b55a | 929 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
7ba24713 AA |
930 | } |
931 | ||
932 | debug_tcp("f, processed %d from out of %d padding %d\n", | |
5bb0b55a MC |
933 | tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); |
934 | BUG_ON(tcp_conn->in.offset - offset > len); | |
7ba24713 | 935 | |
5bb0b55a | 936 | if (tcp_conn->in.offset - offset != len) { |
7ba24713 | 937 | debug_tcp("continue to process %d bytes\n", |
5bb0b55a | 938 | (int)len - (tcp_conn->in.offset - offset)); |
7ba24713 AA |
939 | goto more; |
940 | } | |
941 | ||
942 | nomore: | |
5bb0b55a | 943 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
944 | BUG_ON(processed == 0); |
945 | return processed; | |
946 | ||
947 | again: | |
5bb0b55a | 948 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
949 | debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", |
950 | processed, (int)len, (int)rd_desc->count); | |
951 | BUG_ON(processed == 0); | |
952 | BUG_ON(processed > len); | |
953 | ||
954 | conn->rxdata_octets += processed; | |
955 | return processed; | |
956 | } | |
957 | ||
958 | static void | |
959 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
960 | { | |
961 | struct iscsi_conn *conn = sk->sk_user_data; | |
962 | read_descriptor_t rd_desc; | |
963 | ||
964 | read_lock(&sk->sk_callback_lock); | |
965 | ||
665b44ae MC |
966 | /* |
967 | * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv. | |
968 | * We set count to 1 because we want the network layer to | |
969 | * hand us all the skbs that are available. iscsi_tcp_data_recv | |
970 | * handled pdus that cross buffers or pdus that still need data. | |
971 | */ | |
7ba24713 | 972 | rd_desc.arg.data = conn; |
665b44ae | 973 | rd_desc.count = 1; |
7ba24713 AA |
974 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); |
975 | ||
976 | read_unlock(&sk->sk_callback_lock); | |
977 | } | |
978 | ||
979 | static void | |
980 | iscsi_tcp_state_change(struct sock *sk) | |
981 | { | |
5bb0b55a | 982 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
983 | struct iscsi_conn *conn; |
984 | struct iscsi_session *session; | |
985 | void (*old_state_change)(struct sock *); | |
986 | ||
987 | read_lock(&sk->sk_callback_lock); | |
988 | ||
989 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
990 | session = conn->session; | |
991 | ||
e6273993 MC |
992 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
993 | sk->sk_state == TCP_CLOSE) && | |
994 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
995 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
996 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
997 | } | |
998 | ||
5bb0b55a MC |
999 | tcp_conn = conn->dd_data; |
1000 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
1001 | |
1002 | read_unlock(&sk->sk_callback_lock); | |
1003 | ||
1004 | old_state_change(sk); | |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * iscsi_write_space - Called when more output buffer space is available | |
1009 | * @sk: socket space is available for | |
1010 | **/ | |
1011 | static void | |
1012 | iscsi_write_space(struct sock *sk) | |
1013 | { | |
1014 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1015 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1016 | ||
1017 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1018 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
55e3299d | 1019 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1020 | } |
1021 | ||
1022 | static void | |
1023 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1024 | { | |
5bb0b55a MC |
1025 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1026 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1027 | |
1028 | /* assign new callbacks */ | |
1029 | write_lock_bh(&sk->sk_callback_lock); | |
1030 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1031 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1032 | tcp_conn->old_state_change = sk->sk_state_change; | |
1033 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1034 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1035 | sk->sk_state_change = iscsi_tcp_state_change; | |
1036 | sk->sk_write_space = iscsi_write_space; | |
1037 | write_unlock_bh(&sk->sk_callback_lock); | |
1038 | } | |
1039 | ||
1040 | static void | |
1041 | iscsi_conn_restore_callbacks(struct iscsi_conn *conn) | |
1042 | { | |
5bb0b55a MC |
1043 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1044 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1045 | |
1046 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1047 | write_lock_bh(&sk->sk_callback_lock); | |
1048 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1049 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1050 | sk->sk_state_change = tcp_conn->old_state_change; | |
1051 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1052 | sk->sk_no_check = 0; |
1053 | write_unlock_bh(&sk->sk_callback_lock); | |
1054 | } | |
1055 | ||
1056 | /** | |
1057 | * iscsi_send - generic send routine | |
1058 | * @sk: kernel's socket | |
1059 | * @buf: buffer to write from | |
1060 | * @size: actual size to write | |
1061 | * @flags: socket's flags | |
7ba24713 AA |
1062 | */ |
1063 | static inline int | |
56851698 | 1064 | iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
7ba24713 | 1065 | { |
5bb0b55a MC |
1066 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1067 | struct socket *sk = tcp_conn->sock; | |
3219e529 | 1068 | int offset = buf->sg.offset + buf->sent, res; |
7ba24713 | 1069 | |
7cae5159 MC |
1070 | /* |
1071 | * if we got use_sg=0 or are sending something we kmallocd | |
1072 | * then we did not have to do kmap (kmap returns page_address) | |
1073 | * | |
1074 | * if we got use_sg > 0, but had to drop down, we do not | |
1075 | * set clustering so this should only happen for that | |
1076 | * slab case. | |
1077 | */ | |
1078 | if (buf->use_sendmsg) | |
3219e529 | 1079 | res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags); |
7cae5159 | 1080 | else |
3219e529 MC |
1081 | res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags); |
1082 | ||
1083 | if (res >= 0) { | |
1084 | conn->txdata_octets += res; | |
1085 | buf->sent += res; | |
1086 | return res; | |
1087 | } | |
1088 | ||
1089 | tcp_conn->sendpage_failures_cnt++; | |
1090 | if (res == -EAGAIN) | |
1091 | res = -ENOBUFS; | |
1092 | else | |
1093 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1094 | return res; | |
7ba24713 AA |
1095 | } |
1096 | ||
1097 | /** | |
1098 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() | |
1099 | * @conn: iscsi connection | |
1100 | * @buf: buffer to write from | |
1101 | * @datalen: lenght of data to be sent after the header | |
1102 | * | |
1103 | * Notes: | |
1104 | * (Tx, Fast Path) | |
1105 | **/ | |
1106 | static inline int | |
1107 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) | |
1108 | { | |
7ba24713 AA |
1109 | int flags = 0; /* MSG_DONTWAIT; */ |
1110 | int res, size; | |
1111 | ||
1112 | size = buf->sg.length - buf->sent; | |
1113 | BUG_ON(buf->sent + size > buf->sg.length); | |
1114 | if (buf->sent + size != buf->sg.length || datalen) | |
1115 | flags |= MSG_MORE; | |
1116 | ||
56851698 | 1117 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1118 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
1119 | if (res >= 0) { | |
7ba24713 AA |
1120 | if (size != res) |
1121 | return -EAGAIN; | |
1122 | return 0; | |
3219e529 | 1123 | } |
7ba24713 AA |
1124 | |
1125 | return res; | |
1126 | } | |
1127 | ||
1128 | /** | |
1129 | * iscsi_sendpage - send one page of iSCSI Data-Out. | |
1130 | * @conn: iscsi connection | |
1131 | * @buf: buffer to write from | |
1132 | * @count: remaining data | |
1133 | * @sent: number of bytes sent | |
1134 | * | |
1135 | * Notes: | |
1136 | * (Tx, Fast Path) | |
1137 | **/ | |
1138 | static inline int | |
1139 | iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, | |
1140 | int *count, int *sent) | |
1141 | { | |
7ba24713 AA |
1142 | int flags = 0; /* MSG_DONTWAIT; */ |
1143 | int res, size; | |
1144 | ||
1145 | size = buf->sg.length - buf->sent; | |
1146 | BUG_ON(buf->sent + size > buf->sg.length); | |
1147 | if (size > *count) | |
1148 | size = *count; | |
b13941f6 | 1149 | if (buf->sent + size != buf->sg.length || *count != size) |
7ba24713 AA |
1150 | flags |= MSG_MORE; |
1151 | ||
56851698 | 1152 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1153 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
1154 | size, buf->sent, *count, *sent, res); | |
1155 | if (res >= 0) { | |
7ba24713 AA |
1156 | *count -= res; |
1157 | *sent += res; | |
1158 | if (size != res) | |
1159 | return -EAGAIN; | |
1160 | return 0; | |
3219e529 | 1161 | } |
7ba24713 AA |
1162 | |
1163 | return res; | |
1164 | } | |
1165 | ||
1166 | static inline void | |
5bb0b55a MC |
1167 | iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
1168 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1169 | { |
5bb0b55a MC |
1170 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1171 | ||
1172 | BUG_ON(!tcp_conn->data_tx_tfm); | |
1173 | crypto_digest_init(tcp_conn->data_tx_tfm); | |
1174 | tcp_ctask->digest_count = 4; | |
7ba24713 AA |
1175 | } |
1176 | ||
858119e1 | 1177 | static int |
7ba24713 AA |
1178 | iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
1179 | struct iscsi_buf *buf, uint32_t *digest, int final) | |
1180 | { | |
5bb0b55a MC |
1181 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1182 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 AA |
1183 | int rc = 0; |
1184 | int sent = 0; | |
1185 | ||
1186 | if (final) | |
5bb0b55a | 1187 | crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest); |
7ba24713 | 1188 | |
6e458cc9 | 1189 | iscsi_buf_init_iov(buf, (char*)digest, 4); |
5bb0b55a | 1190 | rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
7ba24713 | 1191 | if (rc) { |
5bb0b55a MC |
1192 | tcp_ctask->datadigest = *digest; |
1193 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; | |
7ba24713 | 1194 | } else |
5bb0b55a | 1195 | tcp_ctask->digest_count = 4; |
7ba24713 AA |
1196 | return rc; |
1197 | } | |
1198 | ||
1199 | /** | |
1200 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1201 | * @conn: iscsi connection | |
1202 | * @ctask: scsi command task | |
1203 | * @r2t: R2T info | |
1204 | * @left: bytes left to transfer | |
1205 | * | |
1206 | * Notes: | |
1207 | * Initialize next Data-Out within this R2T sequence and continue | |
1208 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1209 | * | |
1210 | * Called under connection lock. | |
1211 | **/ | |
1212 | static void | |
1213 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1214 | struct iscsi_r2t_info *r2t, int left) | |
1215 | { | |
5bb0b55a | 1216 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1217 | struct iscsi_data *hdr; |
7ba24713 AA |
1218 | struct scsi_cmnd *sc = ctask->sc; |
1219 | int new_offset; | |
1220 | ||
ffbfe925 | 1221 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
1222 | 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; | |
5bb0b55a MC |
1227 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
1228 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
1229 | 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 | ||
6e458cc9 | 1242 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 1243 | sizeof(struct iscsi_hdr)); |
7ba24713 | 1244 | |
7ba24713 | 1245 | if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { |
5bb0b55a | 1246 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
7ba24713 AA |
1247 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1248 | r2t->sg += 1; | |
1249 | } else | |
5bb0b55a | 1250 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
7ba24713 AA |
1251 | (char*)sc->request_buffer + new_offset, |
1252 | r2t->data_count); | |
7ba24713 AA |
1253 | } |
1254 | ||
1255 | static void | |
1256 | iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1257 | { | |
5bb0b55a | 1258 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1259 | struct iscsi_data_task *dtask; |
1260 | ||
ffbfe925 | 1261 | dtask = tcp_ctask->dtask = &tcp_ctask->unsol_dtask; |
5bb0b55a MC |
1262 | iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr, |
1263 | tcp_ctask->r2t_data_count); | |
6e458cc9 | 1264 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, |
af973481 | 1265 | sizeof(struct iscsi_hdr)); |
7ba24713 AA |
1266 | } |
1267 | ||
1268 | /** | |
5bb0b55a | 1269 | * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 AA |
1270 | * @conn: iscsi connection |
1271 | * @ctask: scsi command task | |
1272 | * @sc: scsi command | |
1273 | **/ | |
1274 | static void | |
5bb0b55a | 1275 | iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
7ba24713 | 1276 | { |
5bb0b55a MC |
1277 | struct scsi_cmnd *sc = ctask->sc; |
1278 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 1279 | |
5bb0b55a | 1280 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
7ba24713 | 1281 | |
5bb0b55a MC |
1282 | tcp_ctask->sent = 0; |
1283 | tcp_ctask->sg_count = 0; | |
7ba24713 AA |
1284 | |
1285 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
5bb0b55a MC |
1286 | tcp_ctask->xmstate = XMSTATE_W_HDR; |
1287 | tcp_ctask->exp_r2tsn = 0; | |
7ba24713 | 1288 | BUG_ON(ctask->total_length == 0); |
5bb0b55a | 1289 | |
7ba24713 AA |
1290 | if (sc->use_sg) { |
1291 | struct scatterlist *sg = sc->request_buffer; | |
1292 | ||
5bb0b55a MC |
1293 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1294 | &sg[tcp_ctask->sg_count++]); | |
1295 | tcp_ctask->sg = sg; | |
1296 | tcp_ctask->bad_sg = sg + sc->use_sg; | |
1297 | } else | |
1298 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, | |
1299 | sc->request_buffer, | |
1300 | sc->request_bufflen); | |
7ba24713 | 1301 | |
5bb0b55a MC |
1302 | if (ctask->imm_count) |
1303 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; | |
1304 | ||
1305 | tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); | |
1306 | if (tcp_ctask->pad_count) { | |
1307 | tcp_ctask->pad_count = ISCSI_PAD_LEN - | |
1308 | tcp_ctask->pad_count; | |
7ba24713 | 1309 | debug_scsi("write padding %d bytes\n", |
5bb0b55a MC |
1310 | tcp_ctask->pad_count); |
1311 | tcp_ctask->xmstate |= XMSTATE_W_PAD; | |
7ba24713 | 1312 | } |
7ba24713 | 1313 | |
5bb0b55a MC |
1314 | if (ctask->unsol_count) |
1315 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR | | |
1316 | XMSTATE_UNS_INIT; | |
1317 | tcp_ctask->r2t_data_count = ctask->total_length - | |
7ba24713 AA |
1318 | ctask->imm_count - |
1319 | ctask->unsol_count; | |
1320 | ||
b6c395ed | 1321 | debug_scsi("cmd [itt 0x%x total %d imm %d imm_data %d " |
7ba24713 AA |
1322 | "r2t_data %d]\n", |
1323 | ctask->itt, ctask->total_length, ctask->imm_count, | |
5bb0b55a MC |
1324 | ctask->unsol_count, tcp_ctask->r2t_data_count); |
1325 | } else | |
1326 | tcp_ctask->xmstate = XMSTATE_R_HDR; | |
7ba24713 | 1327 | |
6e458cc9 | 1328 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, |
af973481 | 1329 | sizeof(struct iscsi_hdr)); |
7ba24713 AA |
1330 | } |
1331 | ||
1332 | /** | |
5bb0b55a | 1333 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
7ba24713 AA |
1334 | * @conn: iscsi connection |
1335 | * @mtask: task management task | |
1336 | * | |
1337 | * Notes: | |
1338 | * The function can return -EAGAIN in which case caller must | |
1339 | * call it again later, or recover. '0' return code means successful | |
1340 | * xmit. | |
1341 | * | |
1342 | * Management xmit state machine consists of two states: | |
1343 | * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress | |
1344 | * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress | |
1345 | **/ | |
1346 | static int | |
5bb0b55a | 1347 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1348 | { |
5bb0b55a | 1349 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
3219e529 | 1350 | int rc; |
7ba24713 AA |
1351 | |
1352 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", | |
5bb0b55a | 1353 | conn->id, tcp_mtask->xmstate, mtask->itt); |
7ba24713 | 1354 | |
5bb0b55a MC |
1355 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { |
1356 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; | |
7ba24713 | 1357 | if (mtask->data_count) |
5bb0b55a | 1358 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
af973481 | 1359 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
30a6c652 | 1360 | conn->stop_stage != STOP_CONN_RECOVER && |
af973481 | 1361 | conn->hdrdgst_en) |
5bb0b55a MC |
1362 | iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
1363 | (u8*)tcp_mtask->hdrext); | |
3219e529 MC |
1364 | rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf, |
1365 | mtask->data_count); | |
1366 | if (rc) { | |
5bb0b55a | 1367 | tcp_mtask->xmstate |= XMSTATE_IMM_HDR; |
7ba24713 | 1368 | if (mtask->data_count) |
5bb0b55a | 1369 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
3219e529 | 1370 | return rc; |
7ba24713 AA |
1371 | } |
1372 | } | |
1373 | ||
5bb0b55a | 1374 | if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 | 1375 | BUG_ON(!mtask->data_count); |
5bb0b55a | 1376 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1377 | /* FIXME: implement. |
1378 | * Virtual buffer could be spreaded across multiple pages... | |
1379 | */ | |
1380 | do { | |
3219e529 MC |
1381 | int rc; |
1382 | ||
1383 | rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf, | |
1384 | &mtask->data_count, &tcp_mtask->sent); | |
1385 | if (rc) { | |
5bb0b55a | 1386 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
3219e529 | 1387 | return rc; |
7ba24713 AA |
1388 | } |
1389 | } while (mtask->data_count); | |
1390 | } | |
1391 | ||
5bb0b55a MC |
1392 | BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
1393 | if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
1394 | struct iscsi_session *session = conn->session; | |
1395 | ||
1396 | spin_lock_bh(&session->lock); | |
1397 | list_del(&conn->mtask->running); | |
1398 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, | |
1399 | sizeof(void*)); | |
1400 | spin_unlock_bh(&session->lock); | |
1401 | } | |
7ba24713 AA |
1402 | return 0; |
1403 | } | |
1404 | ||
1405 | static inline int | |
5bb0b55a MC |
1406 | handle_xmstate_r_hdr(struct iscsi_conn *conn, |
1407 | struct iscsi_tcp_cmd_task *tcp_ctask) | |
7ba24713 | 1408 | { |
3219e529 MC |
1409 | int rc; |
1410 | ||
5bb0b55a | 1411 | tcp_ctask->xmstate &= ~XMSTATE_R_HDR; |
42f72aa9 | 1412 | if (conn->hdrdgst_en) |
5bb0b55a MC |
1413 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
1414 | (u8*)tcp_ctask->hdrext); | |
3219e529 MC |
1415 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0); |
1416 | if (!rc) { | |
5bb0b55a | 1417 | BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE); |
7ba24713 AA |
1418 | return 0; /* wait for Data-In */ |
1419 | } | |
5bb0b55a | 1420 | tcp_ctask->xmstate |= XMSTATE_R_HDR; |
3219e529 | 1421 | return rc; |
7ba24713 AA |
1422 | } |
1423 | ||
1424 | static inline int | |
5bb0b55a MC |
1425 | handle_xmstate_w_hdr(struct iscsi_conn *conn, |
1426 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1427 | { |
5bb0b55a | 1428 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1429 | int rc; |
5bb0b55a MC |
1430 | |
1431 | tcp_ctask->xmstate &= ~XMSTATE_W_HDR; | |
42f72aa9 | 1432 | if (conn->hdrdgst_en) |
5bb0b55a MC |
1433 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
1434 | (u8*)tcp_ctask->hdrext); | |
3219e529 MC |
1435 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count); |
1436 | if (rc) | |
5bb0b55a | 1437 | tcp_ctask->xmstate |= XMSTATE_W_HDR; |
3219e529 | 1438 | return rc; |
7ba24713 AA |
1439 | } |
1440 | ||
1441 | static inline int | |
1442 | handle_xmstate_data_digest(struct iscsi_conn *conn, | |
1443 | struct iscsi_cmd_task *ctask) | |
1444 | { | |
5bb0b55a | 1445 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1446 | int rc; |
5bb0b55a MC |
1447 | |
1448 | tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST; | |
1449 | debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest); | |
3219e529 MC |
1450 | rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, |
1451 | &tcp_ctask->datadigest, 0); | |
1452 | if (rc) { | |
5bb0b55a | 1453 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; |
7ba24713 | 1454 | debug_tcp("resent data digest 0x%x fail!\n", |
5bb0b55a | 1455 | tcp_ctask->datadigest); |
7ba24713 | 1456 | } |
3219e529 MC |
1457 | |
1458 | return rc; | |
7ba24713 AA |
1459 | } |
1460 | ||
1461 | static inline int | |
1462 | handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1463 | { | |
5bb0b55a MC |
1464 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1465 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
3219e529 | 1466 | int rc; |
5bb0b55a | 1467 | |
7ba24713 | 1468 | BUG_ON(!ctask->imm_count); |
5bb0b55a | 1469 | tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1470 | |
1471 | if (conn->datadgst_en) { | |
5bb0b55a MC |
1472 | iscsi_data_digest_init(tcp_conn, ctask); |
1473 | tcp_ctask->immdigest = 0; | |
7ba24713 AA |
1474 | } |
1475 | ||
1476 | for (;;) { | |
3219e529 MC |
1477 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
1478 | &ctask->imm_count, &tcp_ctask->sent); | |
1479 | if (rc) { | |
5bb0b55a | 1480 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; |
7ba24713 | 1481 | if (conn->datadgst_en) { |
5bb0b55a MC |
1482 | crypto_digest_final(tcp_conn->data_tx_tfm, |
1483 | (u8*)&tcp_ctask->immdigest); | |
7ba24713 | 1484 | debug_tcp("tx imm sendpage fail 0x%x\n", |
5bb0b55a | 1485 | tcp_ctask->datadigest); |
7ba24713 | 1486 | } |
3219e529 | 1487 | return rc; |
7ba24713 AA |
1488 | } |
1489 | if (conn->datadgst_en) | |
5bb0b55a MC |
1490 | crypto_digest_update(tcp_conn->data_tx_tfm, |
1491 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1492 | |
1493 | if (!ctask->imm_count) | |
1494 | break; | |
5bb0b55a MC |
1495 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1496 | &tcp_ctask->sg[tcp_ctask->sg_count++]); | |
7ba24713 AA |
1497 | } |
1498 | ||
5bb0b55a | 1499 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
3219e529 MC |
1500 | rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, |
1501 | &tcp_ctask->immdigest, 1); | |
1502 | if (rc) { | |
7ba24713 | 1503 | debug_tcp("sending imm digest 0x%x fail!\n", |
5bb0b55a | 1504 | tcp_ctask->immdigest); |
3219e529 | 1505 | return rc; |
7ba24713 | 1506 | } |
5bb0b55a | 1507 | debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest); |
7ba24713 AA |
1508 | } |
1509 | ||
1510 | return 0; | |
1511 | } | |
1512 | ||
1513 | static inline int | |
1514 | handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1515 | { | |
5bb0b55a | 1516 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1517 | struct iscsi_data_task *dtask; |
3219e529 | 1518 | int rc; |
7ba24713 | 1519 | |
5bb0b55a MC |
1520 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
1521 | if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { | |
7ba24713 | 1522 | iscsi_unsolicit_data_init(conn, ctask); |
5bb0b55a | 1523 | dtask = tcp_ctask->dtask; |
af973481 | 1524 | if (conn->hdrdgst_en) |
5bb0b55a | 1525 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
af973481 | 1526 | (u8*)dtask->hdrext); |
5bb0b55a | 1527 | tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
7ba24713 | 1528 | } |
3219e529 MC |
1529 | |
1530 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count); | |
1531 | if (rc) { | |
5bb0b55a MC |
1532 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
1533 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR; | |
3219e529 | 1534 | return rc; |
7ba24713 AA |
1535 | } |
1536 | ||
1537 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", | |
5bb0b55a | 1538 | ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
7ba24713 AA |
1539 | return 0; |
1540 | } | |
1541 | ||
1542 | static inline int | |
1543 | handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1544 | { | |
5bb0b55a MC |
1545 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1546 | struct iscsi_data_task *dtask = tcp_ctask->dtask; | |
1547 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
3219e529 | 1548 | int rc; |
7ba24713 AA |
1549 | |
1550 | BUG_ON(!ctask->data_count); | |
5bb0b55a | 1551 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
7ba24713 AA |
1552 | |
1553 | if (conn->datadgst_en) { | |
5bb0b55a | 1554 | iscsi_data_digest_init(tcp_conn, ctask); |
7ba24713 AA |
1555 | dtask->digest = 0; |
1556 | } | |
1557 | ||
1558 | for (;;) { | |
5bb0b55a | 1559 | int start = tcp_ctask->sent; |
7ba24713 | 1560 | |
3219e529 MC |
1561 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
1562 | &ctask->data_count, &tcp_ctask->sent); | |
1563 | if (rc) { | |
5bb0b55a MC |
1564 | ctask->unsol_count -= tcp_ctask->sent - start; |
1565 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; | |
7ba24713 AA |
1566 | /* will continue with this ctask later.. */ |
1567 | if (conn->datadgst_en) { | |
5bb0b55a | 1568 | crypto_digest_final(tcp_conn->data_tx_tfm, |
7ba24713 AA |
1569 | (u8 *)&dtask->digest); |
1570 | debug_tcp("tx uns data fail 0x%x\n", | |
1571 | dtask->digest); | |
1572 | } | |
3219e529 | 1573 | return rc; |
7ba24713 AA |
1574 | } |
1575 | ||
5bb0b55a MC |
1576 | BUG_ON(tcp_ctask->sent > ctask->total_length); |
1577 | ctask->unsol_count -= tcp_ctask->sent - start; | |
7ba24713 AA |
1578 | |
1579 | /* | |
1580 | * XXX:we may run here with un-initial sendbuf. | |
1581 | * so pass it | |
1582 | */ | |
5bb0b55a MC |
1583 | if (conn->datadgst_en && tcp_ctask->sent - start > 0) |
1584 | crypto_digest_update(tcp_conn->data_tx_tfm, | |
1585 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1586 | |
1587 | if (!ctask->data_count) | |
1588 | break; | |
5bb0b55a MC |
1589 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1590 | &tcp_ctask->sg[tcp_ctask->sg_count++]); | |
7ba24713 AA |
1591 | } |
1592 | BUG_ON(ctask->unsol_count < 0); | |
1593 | ||
1594 | /* | |
1595 | * Done with the Data-Out. Next, check if we need | |
1596 | * to send another unsolicited Data-Out. | |
1597 | */ | |
1598 | if (ctask->unsol_count) { | |
1599 | if (conn->datadgst_en) { | |
3219e529 | 1600 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1601 | &dtask->digestbuf, |
3219e529 MC |
1602 | &dtask->digest, 1); |
1603 | if (rc) { | |
7ba24713 AA |
1604 | debug_tcp("send uns digest 0x%x fail\n", |
1605 | dtask->digest); | |
3219e529 | 1606 | return rc; |
7ba24713 AA |
1607 | } |
1608 | debug_tcp("sending uns digest 0x%x, more uns\n", | |
1609 | dtask->digest); | |
1610 | } | |
5bb0b55a | 1611 | tcp_ctask->xmstate |= XMSTATE_UNS_INIT; |
7ba24713 AA |
1612 | return 1; |
1613 | } | |
1614 | ||
5bb0b55a | 1615 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
3219e529 | 1616 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1617 | &dtask->digestbuf, |
3219e529 MC |
1618 | &dtask->digest, 1); |
1619 | if (rc) { | |
7ba24713 AA |
1620 | debug_tcp("send last uns digest 0x%x fail\n", |
1621 | dtask->digest); | |
3219e529 | 1622 | return rc; |
7ba24713 AA |
1623 | } |
1624 | debug_tcp("sending uns digest 0x%x\n",dtask->digest); | |
1625 | } | |
1626 | ||
1627 | return 0; | |
1628 | } | |
1629 | ||
1630 | static inline int | |
1631 | handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1632 | { | |
1633 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
1634 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1635 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1636 | struct iscsi_r2t_info *r2t = tcp_ctask->r2t; | |
ffbfe925 | 1637 | struct iscsi_data_task *dtask = &r2t->dtask; |
3219e529 | 1638 | int left, rc; |
7ba24713 | 1639 | |
5bb0b55a MC |
1640 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
1641 | tcp_ctask->dtask = dtask; | |
7ba24713 AA |
1642 | |
1643 | if (conn->datadgst_en) { | |
5bb0b55a | 1644 | iscsi_data_digest_init(tcp_conn, ctask); |
7ba24713 AA |
1645 | dtask->digest = 0; |
1646 | } | |
1647 | solicit_again: | |
1648 | /* | |
b6c395ed | 1649 | * send Data-Out within this R2T sequence. |
7ba24713 AA |
1650 | */ |
1651 | if (!r2t->data_count) | |
1652 | goto data_out_done; | |
1653 | ||
3219e529 MC |
1654 | rc = iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent); |
1655 | if (rc) { | |
5bb0b55a | 1656 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
7ba24713 AA |
1657 | /* will continue with this ctask later.. */ |
1658 | if (conn->datadgst_en) { | |
5bb0b55a | 1659 | crypto_digest_final(tcp_conn->data_tx_tfm, |
7ba24713 AA |
1660 | (u8 *)&dtask->digest); |
1661 | debug_tcp("r2t data send fail 0x%x\n", dtask->digest); | |
1662 | } | |
3219e529 | 1663 | return rc; |
7ba24713 AA |
1664 | } |
1665 | ||
1666 | BUG_ON(r2t->data_count < 0); | |
1667 | if (conn->datadgst_en) | |
5bb0b55a MC |
1668 | crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg, |
1669 | 1); | |
7ba24713 AA |
1670 | |
1671 | if (r2t->data_count) { | |
1672 | BUG_ON(ctask->sc->use_sg == 0); | |
1673 | if (!iscsi_buf_left(&r2t->sendbuf)) { | |
5bb0b55a | 1674 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
7ba24713 AA |
1675 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1676 | r2t->sg += 1; | |
1677 | } | |
1678 | goto solicit_again; | |
1679 | } | |
1680 | ||
1681 | data_out_done: | |
1682 | /* | |
1683 | * Done with this Data-Out. Next, check if we have | |
1684 | * to send another Data-Out for this R2T. | |
1685 | */ | |
1686 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1687 | left = r2t->data_length - r2t->sent; | |
1688 | if (left) { | |
1689 | if (conn->datadgst_en) { | |
3219e529 | 1690 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1691 | &dtask->digestbuf, |
3219e529 MC |
1692 | &dtask->digest, 1); |
1693 | if (rc) { | |
7ba24713 AA |
1694 | debug_tcp("send r2t data digest 0x%x" |
1695 | "fail\n", dtask->digest); | |
3219e529 | 1696 | return rc; |
7ba24713 AA |
1697 | } |
1698 | debug_tcp("r2t data send digest 0x%x\n", | |
1699 | dtask->digest); | |
1700 | } | |
1701 | iscsi_solicit_data_cont(conn, ctask, r2t, left); | |
5bb0b55a MC |
1702 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
1703 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
7ba24713 AA |
1704 | return 1; |
1705 | } | |
1706 | ||
1707 | /* | |
1708 | * Done with this R2T. Check if there are more | |
1709 | * outstanding R2Ts ready to be processed. | |
1710 | */ | |
5bb0b55a | 1711 | BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0); |
7ba24713 | 1712 | if (conn->datadgst_en) { |
3219e529 MC |
1713 | rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, |
1714 | &dtask->digest, 1); | |
1715 | if (rc) { | |
7ba24713 AA |
1716 | debug_tcp("send last r2t data digest 0x%x" |
1717 | "fail\n", dtask->digest); | |
3219e529 | 1718 | return rc; |
7ba24713 AA |
1719 | } |
1720 | debug_tcp("r2t done dout digest 0x%x\n", dtask->digest); | |
1721 | } | |
1722 | ||
5bb0b55a MC |
1723 | tcp_ctask->r2t_data_count -= r2t->data_length; |
1724 | tcp_ctask->r2t = NULL; | |
7ba24713 | 1725 | spin_lock_bh(&session->lock); |
5bb0b55a | 1726 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 | 1727 | spin_unlock_bh(&session->lock); |
5bb0b55a MC |
1728 | if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { |
1729 | tcp_ctask->r2t = r2t; | |
1730 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
1731 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
7ba24713 AA |
1732 | return 1; |
1733 | } | |
1734 | ||
1735 | return 0; | |
1736 | } | |
1737 | ||
1738 | static inline int | |
1739 | handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1740 | { | |
5bb0b55a MC |
1741 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1742 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1743 | struct iscsi_data_task *dtask = tcp_ctask->dtask; | |
b6c395ed | 1744 | int sent = 0, rc; |
7ba24713 | 1745 | |
5bb0b55a | 1746 | tcp_ctask->xmstate &= ~XMSTATE_W_PAD; |
6e458cc9 | 1747 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, |
5bb0b55a | 1748 | tcp_ctask->pad_count); |
3219e529 MC |
1749 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, |
1750 | &sent); | |
1751 | if (rc) { | |
5bb0b55a | 1752 | tcp_ctask->xmstate |= XMSTATE_W_PAD; |
3219e529 | 1753 | return rc; |
7ba24713 AA |
1754 | } |
1755 | ||
1756 | if (conn->datadgst_en) { | |
5bb0b55a MC |
1757 | crypto_digest_update(tcp_conn->data_tx_tfm, |
1758 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1759 | /* imm data? */ |
1760 | if (!dtask) { | |
3219e529 | 1761 | rc = iscsi_digest_final_send(conn, ctask, |
5bb0b55a | 1762 | &tcp_ctask->immbuf, |
3219e529 MC |
1763 | &tcp_ctask->immdigest, 1); |
1764 | if (rc) { | |
7ba24713 | 1765 | debug_tcp("send padding digest 0x%x" |
5bb0b55a | 1766 | "fail!\n", tcp_ctask->immdigest); |
3219e529 | 1767 | return rc; |
7ba24713 AA |
1768 | } |
1769 | debug_tcp("done with padding, digest 0x%x\n", | |
5bb0b55a | 1770 | tcp_ctask->datadigest); |
7ba24713 | 1771 | } else { |
3219e529 | 1772 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1773 | &dtask->digestbuf, |
3219e529 MC |
1774 | &dtask->digest, 1); |
1775 | if (rc) { | |
7ba24713 AA |
1776 | debug_tcp("send padding digest 0x%x" |
1777 | "fail\n", dtask->digest); | |
3219e529 | 1778 | return rc; |
7ba24713 AA |
1779 | } |
1780 | debug_tcp("done with padding, digest 0x%x\n", | |
1781 | dtask->digest); | |
1782 | } | |
1783 | } | |
1784 | ||
1785 | return 0; | |
1786 | } | |
1787 | ||
1788 | static int | |
5bb0b55a | 1789 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 1790 | { |
5bb0b55a | 1791 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1792 | int rc = 0; |
1793 | ||
1794 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", | |
5bb0b55a | 1795 | conn->id, tcp_ctask->xmstate, ctask->itt); |
7ba24713 AA |
1796 | |
1797 | /* | |
1798 | * serialize with TMF AbortTask | |
1799 | */ | |
1800 | if (ctask->mtask) | |
1801 | return rc; | |
1802 | ||
3219e529 MC |
1803 | if (tcp_ctask->xmstate & XMSTATE_R_HDR) |
1804 | return handle_xmstate_r_hdr(conn, tcp_ctask); | |
7ba24713 | 1805 | |
5bb0b55a | 1806 | if (tcp_ctask->xmstate & XMSTATE_W_HDR) { |
7ba24713 AA |
1807 | rc = handle_xmstate_w_hdr(conn, ctask); |
1808 | if (rc) | |
1809 | return rc; | |
1810 | } | |
1811 | ||
1812 | /* XXX: for data digest xmit recover */ | |
5bb0b55a | 1813 | if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) { |
7ba24713 AA |
1814 | rc = handle_xmstate_data_digest(conn, ctask); |
1815 | if (rc) | |
1816 | return rc; | |
1817 | } | |
1818 | ||
5bb0b55a | 1819 | if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 AA |
1820 | rc = handle_xmstate_imm_data(conn, ctask); |
1821 | if (rc) | |
1822 | return rc; | |
1823 | } | |
1824 | ||
5bb0b55a | 1825 | if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
7ba24713 | 1826 | BUG_ON(!ctask->unsol_count); |
5bb0b55a | 1827 | tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; |
7ba24713 AA |
1828 | unsolicit_head_again: |
1829 | rc = handle_xmstate_uns_hdr(conn, ctask); | |
1830 | if (rc) | |
1831 | return rc; | |
1832 | } | |
1833 | ||
5bb0b55a | 1834 | if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
7ba24713 AA |
1835 | rc = handle_xmstate_uns_data(conn, ctask); |
1836 | if (rc == 1) | |
1837 | goto unsolicit_head_again; | |
1838 | else if (rc) | |
1839 | return rc; | |
1840 | goto done; | |
1841 | } | |
1842 | ||
5bb0b55a | 1843 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { |
7ba24713 AA |
1844 | struct iscsi_r2t_info *r2t; |
1845 | ||
5bb0b55a MC |
1846 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
1847 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
1848 | if (!tcp_ctask->r2t) | |
1849 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, | |
7ba24713 AA |
1850 | sizeof(void*)); |
1851 | solicit_head_again: | |
5bb0b55a | 1852 | r2t = tcp_ctask->r2t; |
af973481 | 1853 | if (conn->hdrdgst_en) |
42f72aa9 | 1854 | iscsi_hdr_digest(conn, &r2t->headbuf, |
ffbfe925 | 1855 | (u8*)r2t->dtask.hdrext); |
3219e529 MC |
1856 | rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count); |
1857 | if (rc) { | |
5bb0b55a MC |
1858 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
1859 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
3219e529 | 1860 | return rc; |
7ba24713 AA |
1861 | } |
1862 | ||
1863 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", | |
1864 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, | |
1865 | r2t->sent); | |
1866 | } | |
1867 | ||
5bb0b55a | 1868 | if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
7ba24713 AA |
1869 | rc = handle_xmstate_sol_data(conn, ctask); |
1870 | if (rc == 1) | |
1871 | goto solicit_head_again; | |
1872 | if (rc) | |
1873 | return rc; | |
1874 | } | |
1875 | ||
1876 | done: | |
1877 | /* | |
1878 | * Last thing to check is whether we need to send write | |
1879 | * padding. Note that we check for xmstate equality, not just the bit. | |
1880 | */ | |
5bb0b55a | 1881 | if (tcp_ctask->xmstate == XMSTATE_W_PAD) |
7ba24713 AA |
1882 | rc = handle_xmstate_w_pad(conn, ctask); |
1883 | ||
1884 | return rc; | |
1885 | } | |
1886 | ||
5bb0b55a MC |
1887 | static struct iscsi_cls_conn * |
1888 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1889 | { |
5bb0b55a MC |
1890 | struct iscsi_conn *conn; |
1891 | struct iscsi_cls_conn *cls_conn; | |
1892 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1893 | |
5bb0b55a MC |
1894 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
1895 | if (!cls_conn) | |
1896 | return NULL; | |
1897 | conn = cls_conn->dd_data; | |
7ba24713 | 1898 | /* |
5bb0b55a MC |
1899 | * due to strange issues with iser these are not set |
1900 | * in iscsi_conn_setup | |
7ba24713 | 1901 | */ |
5bb0b55a | 1902 | conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; |
7ba24713 | 1903 | |
5bb0b55a MC |
1904 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
1905 | if (!tcp_conn) | |
1906 | goto tcp_conn_alloc_fail; | |
7ba24713 | 1907 | |
5bb0b55a MC |
1908 | conn->dd_data = tcp_conn; |
1909 | tcp_conn->iscsi_conn = conn; | |
1910 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
1911 | /* initial operational parameters */ | |
1912 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); | |
1913 | tcp_conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; | |
7ba24713 | 1914 | |
5bb0b55a MC |
1915 | /* allocate initial PDU receive place holder */ |
1916 | if (tcp_conn->data_size <= PAGE_SIZE) | |
1917 | tcp_conn->data = kmalloc(tcp_conn->data_size, GFP_KERNEL); | |
1918 | else | |
1919 | tcp_conn->data = (void*)__get_free_pages(GFP_KERNEL, | |
1920 | get_order(tcp_conn->data_size)); | |
1921 | if (!tcp_conn->data) | |
1922 | goto max_recv_dlenght_alloc_fail; | |
7ba24713 | 1923 | |
5bb0b55a | 1924 | return cls_conn; |
7ba24713 | 1925 | |
5bb0b55a MC |
1926 | max_recv_dlenght_alloc_fail: |
1927 | kfree(tcp_conn); | |
1928 | tcp_conn_alloc_fail: | |
1929 | iscsi_conn_teardown(cls_conn); | |
1930 | return NULL; | |
7ba24713 AA |
1931 | } |
1932 | ||
1933 | static void | |
5bb0b55a | 1934 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1935 | { |
5bb0b55a MC |
1936 | struct iscsi_conn *conn = cls_conn->dd_data; |
1937 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1938 | int digest = 0; | |
7ba24713 | 1939 | |
5bb0b55a MC |
1940 | if (conn->hdrdgst_en || conn->datadgst_en) |
1941 | digest = 1; | |
7ba24713 | 1942 | |
5bb0b55a | 1943 | iscsi_conn_teardown(cls_conn); |
7ba24713 | 1944 | |
5bb0b55a MC |
1945 | /* now free tcp_conn */ |
1946 | if (digest) { | |
1947 | if (tcp_conn->tx_tfm) | |
1948 | crypto_free_tfm(tcp_conn->tx_tfm); | |
1949 | if (tcp_conn->rx_tfm) | |
1950 | crypto_free_tfm(tcp_conn->rx_tfm); | |
1951 | if (tcp_conn->data_tx_tfm) | |
1952 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
1953 | if (tcp_conn->data_rx_tfm) | |
1954 | crypto_free_tfm(tcp_conn->data_rx_tfm); | |
1955 | } | |
7ba24713 | 1956 | |
5bb0b55a MC |
1957 | /* free conn->data, size = MaxRecvDataSegmentLength */ |
1958 | if (tcp_conn->data_size <= PAGE_SIZE) | |
1959 | kfree(tcp_conn->data); | |
1960 | else | |
1961 | free_pages((unsigned long)tcp_conn->data, | |
1962 | get_order(tcp_conn->data_size)); | |
1963 | kfree(tcp_conn); | |
1964 | } | |
7ba24713 | 1965 | |
5bb0b55a MC |
1966 | static int |
1967 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1968 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1969 | int is_leading) |
1970 | { | |
1971 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1972 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1973 | struct sock *sk; | |
1974 | struct socket *sock; | |
1975 | int err; | |
7ba24713 | 1976 | |
5bb0b55a | 1977 | /* lookup for existing socket */ |
264faaaa | 1978 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a MC |
1979 | if (!sock) { |
1980 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); | |
1981 | return -EEXIST; | |
7ba24713 AA |
1982 | } |
1983 | ||
5bb0b55a MC |
1984 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
1985 | if (err) | |
1986 | return err; | |
7ba24713 | 1987 | |
67a61114 MC |
1988 | /* bind iSCSI connection and socket */ |
1989 | tcp_conn->sock = sock; | |
7ba24713 | 1990 | |
67a61114 MC |
1991 | /* setup Socket parameters */ |
1992 | sk = sock->sk; | |
1993 | sk->sk_reuse = 1; | |
1994 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
1995 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 1996 | |
67a61114 | 1997 | /* FIXME: disable Nagle's algorithm */ |
7ba24713 | 1998 | |
67a61114 MC |
1999 | /* |
2000 | * Intercept TCP callbacks for sendfile like receive | |
2001 | * processing. | |
2002 | */ | |
2003 | conn->recv_lock = &sk->sk_callback_lock; | |
2004 | iscsi_conn_set_callbacks(conn); | |
2005 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; | |
2006 | /* | |
2007 | * set receive state machine into initial state | |
2008 | */ | |
2009 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 | 2010 | |
7ba24713 AA |
2011 | return 0; |
2012 | } | |
2013 | ||
30a6c652 | 2014 | static void |
5bb0b55a | 2015 | iscsi_tcp_suspend_conn_rx(struct iscsi_conn *conn) |
30a6c652 | 2016 | { |
5bb0b55a | 2017 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 2018 | struct sock *sk; |
7ba24713 | 2019 | |
5bb0b55a MC |
2020 | if (!tcp_conn->sock) |
2021 | return; | |
2022 | ||
2023 | sk = tcp_conn->sock->sk; | |
7ba24713 | 2024 | write_lock_bh(&sk->sk_callback_lock); |
5bb0b55a | 2025 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); |
7ba24713 | 2026 | write_unlock_bh(&sk->sk_callback_lock); |
30a6c652 | 2027 | } |
7ba24713 | 2028 | |
30a6c652 | 2029 | static void |
5bb0b55a | 2030 | iscsi_tcp_terminate_conn(struct iscsi_conn *conn) |
30a6c652 | 2031 | { |
5bb0b55a | 2032 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 2033 | |
5bb0b55a MC |
2034 | if (!tcp_conn->sock) |
2035 | return; | |
7ba24713 | 2036 | |
5bb0b55a | 2037 | sock_hold(tcp_conn->sock->sk); |
30a6c652 | 2038 | iscsi_conn_restore_callbacks(conn); |
5bb0b55a | 2039 | sock_put(tcp_conn->sock->sk); |
7ba24713 | 2040 | |
5bb0b55a MC |
2041 | sock_release(tcp_conn->sock); |
2042 | tcp_conn->sock = NULL; | |
2043 | conn->recv_lock = NULL; | |
7ba24713 AA |
2044 | } |
2045 | ||
5bb0b55a | 2046 | /* called with host lock */ |
30a6c652 | 2047 | static void |
5bb0b55a MC |
2048 | iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask, |
2049 | char *data, uint32_t data_size) | |
7ba24713 | 2050 | { |
5bb0b55a | 2051 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
7ba24713 | 2052 | |
6e458cc9 MC |
2053 | iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr, |
2054 | sizeof(struct iscsi_hdr)); | |
5bb0b55a | 2055 | tcp_mtask->xmstate = XMSTATE_IMM_HDR; |
b6c395ed | 2056 | tcp_mtask->sent = 0; |
7ba24713 | 2057 | |
5bb0b55a MC |
2058 | if (mtask->data_count) |
2059 | iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data, | |
7ba24713 | 2060 | mtask->data_count); |
7ba24713 AA |
2061 | } |
2062 | ||
2063 | static int | |
2064 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
2065 | { | |
2066 | int i; | |
2067 | int cmd_i; | |
2068 | ||
2069 | /* | |
2070 | * initialize per-task: R2T pool and xmit queue | |
2071 | */ | |
2072 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2073 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
5bb0b55a | 2074 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
2075 | |
2076 | /* | |
2077 | * pre-allocated x4 as much r2ts to handle race when | |
2078 | * target acks DataOut faster than we data_xmit() queues | |
2079 | * could replenish r2tqueue. | |
2080 | */ | |
2081 | ||
2082 | /* R2T pool */ | |
5bb0b55a MC |
2083 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
2084 | (void***)&tcp_ctask->r2ts, | |
2085 | sizeof(struct iscsi_r2t_info))) { | |
7ba24713 AA |
2086 | goto r2t_alloc_fail; |
2087 | } | |
2088 | ||
2089 | /* R2T xmit queue */ | |
5bb0b55a | 2090 | tcp_ctask->r2tqueue = kfifo_alloc( |
7ba24713 | 2091 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
5bb0b55a MC |
2092 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
2093 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2094 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2095 | goto r2t_alloc_fail; |
2096 | } | |
7ba24713 AA |
2097 | } |
2098 | ||
2099 | return 0; | |
2100 | ||
2101 | r2t_alloc_fail: | |
2102 | for (i = 0; i < cmd_i; i++) { | |
5bb0b55a MC |
2103 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2104 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2105 | ||
5bb0b55a MC |
2106 | kfifo_free(tcp_ctask->r2tqueue); |
2107 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2108 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2109 | } |
2110 | return -ENOMEM; | |
2111 | } | |
2112 | ||
2113 | static void | |
2114 | iscsi_r2tpool_free(struct iscsi_session *session) | |
2115 | { | |
2116 | int i; | |
2117 | ||
2118 | for (i = 0; i < session->cmds_max; i++) { | |
5bb0b55a MC |
2119 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2120 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 2121 | |
5bb0b55a MC |
2122 | kfifo_free(tcp_ctask->r2tqueue); |
2123 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2124 | (void**)tcp_ctask->r2ts); | |
7ba24713 | 2125 | } |
7ba24713 AA |
2126 | } |
2127 | ||
2128 | static int | |
7b7232f3 | 2129 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
5c75b7fc | 2130 | char *buf, int buflen) |
7ba24713 | 2131 | { |
7b7232f3 | 2132 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 2133 | struct iscsi_session *session = conn->session; |
5bb0b55a | 2134 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5c75b7fc | 2135 | int value; |
7ba24713 | 2136 | |
7ba24713 AA |
2137 | switch(param) { |
2138 | case ISCSI_PARAM_MAX_RECV_DLENGTH: { | |
5bb0b55a | 2139 | char *saveptr = tcp_conn->data; |
b53cb2a4 | 2140 | gfp_t flags = GFP_KERNEL; |
7ba24713 | 2141 | |
5c75b7fc | 2142 | sscanf(buf, "%d", &value); |
5bb0b55a | 2143 | if (tcp_conn->data_size >= value) { |
5c75b7fc | 2144 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2145 | break; |
2146 | } | |
2147 | ||
2148 | spin_lock_bh(&session->lock); | |
2149 | if (conn->stop_stage == STOP_CONN_RECOVER) | |
2150 | flags = GFP_ATOMIC; | |
2151 | spin_unlock_bh(&session->lock); | |
2152 | ||
2153 | if (value <= PAGE_SIZE) | |
5bb0b55a | 2154 | tcp_conn->data = kmalloc(value, flags); |
7ba24713 | 2155 | else |
5bb0b55a | 2156 | tcp_conn->data = (void*)__get_free_pages(flags, |
7ba24713 | 2157 | get_order(value)); |
5bb0b55a MC |
2158 | if (tcp_conn->data == NULL) { |
2159 | tcp_conn->data = saveptr; | |
7ba24713 AA |
2160 | return -ENOMEM; |
2161 | } | |
5bb0b55a | 2162 | if (tcp_conn->data_size <= PAGE_SIZE) |
7ba24713 AA |
2163 | kfree(saveptr); |
2164 | else | |
2165 | free_pages((unsigned long)saveptr, | |
5bb0b55a | 2166 | get_order(tcp_conn->data_size)); |
5c75b7fc | 2167 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a | 2168 | tcp_conn->data_size = value; |
7ba24713 | 2169 | break; |
5c75b7fc | 2170 | } |
7ba24713 | 2171 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 2172 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a | 2173 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
7ba24713 | 2174 | if (conn->hdrdgst_en) { |
5bb0b55a MC |
2175 | tcp_conn->hdr_size += sizeof(__u32); |
2176 | if (!tcp_conn->tx_tfm) | |
2177 | tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c", | |
2178 | 0); | |
2179 | if (!tcp_conn->tx_tfm) | |
7ba24713 | 2180 | return -ENOMEM; |
5bb0b55a MC |
2181 | if (!tcp_conn->rx_tfm) |
2182 | tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c", | |
2183 | 0); | |
2184 | if (!tcp_conn->rx_tfm) { | |
2185 | crypto_free_tfm(tcp_conn->tx_tfm); | |
7ba24713 AA |
2186 | return -ENOMEM; |
2187 | } | |
2188 | } else { | |
5bb0b55a MC |
2189 | if (tcp_conn->tx_tfm) |
2190 | crypto_free_tfm(tcp_conn->tx_tfm); | |
2191 | if (tcp_conn->rx_tfm) | |
2192 | crypto_free_tfm(tcp_conn->rx_tfm); | |
7ba24713 AA |
2193 | } |
2194 | break; | |
2195 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 2196 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 | 2197 | if (conn->datadgst_en) { |
5bb0b55a MC |
2198 | if (!tcp_conn->data_tx_tfm) |
2199 | tcp_conn->data_tx_tfm = | |
7ba24713 | 2200 | crypto_alloc_tfm("crc32c", 0); |
5bb0b55a | 2201 | if (!tcp_conn->data_tx_tfm) |
7ba24713 | 2202 | return -ENOMEM; |
5bb0b55a MC |
2203 | if (!tcp_conn->data_rx_tfm) |
2204 | tcp_conn->data_rx_tfm = | |
7ba24713 | 2205 | crypto_alloc_tfm("crc32c", 0); |
5bb0b55a MC |
2206 | if (!tcp_conn->data_rx_tfm) { |
2207 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
7ba24713 AA |
2208 | return -ENOMEM; |
2209 | } | |
2210 | } else { | |
5bb0b55a MC |
2211 | if (tcp_conn->data_tx_tfm) |
2212 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
2213 | if (tcp_conn->data_rx_tfm) | |
2214 | crypto_free_tfm(tcp_conn->data_rx_tfm); | |
7ba24713 | 2215 | } |
5bb0b55a MC |
2216 | tcp_conn->sendpage = conn->datadgst_en ? |
2217 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 | 2218 | break; |
7ba24713 | 2219 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 2220 | sscanf(buf, "%d", &value); |
7ba24713 AA |
2221 | if (session->max_r2t == roundup_pow_of_two(value)) |
2222 | break; | |
2223 | iscsi_r2tpool_free(session); | |
5c75b7fc | 2224 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2225 | if (session->max_r2t & (session->max_r2t - 1)) |
2226 | session->max_r2t = roundup_pow_of_two(session->max_r2t); | |
2227 | if (iscsi_r2tpool_alloc(session)) | |
2228 | return -ENOMEM; | |
2229 | break; | |
7ba24713 | 2230 | default: |
5c75b7fc | 2231 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2232 | } |
2233 | ||
2234 | return 0; | |
2235 | } | |
2236 | ||
2237 | static int | |
5c75b7fc MC |
2238 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
2239 | enum iscsi_param param, char *buf) | |
7b8631b5 | 2240 | { |
7b7232f3 | 2241 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2242 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
fd7255f5 | 2243 | struct inet_sock *inet; |
5c75b7fc MC |
2244 | struct ipv6_pinfo *np; |
2245 | struct sock *sk; | |
2246 | int len; | |
7b8631b5 MC |
2247 | |
2248 | switch(param) { | |
fd7255f5 MC |
2249 | case ISCSI_PARAM_CONN_PORT: |
2250 | mutex_lock(&conn->xmitmutex); | |
5bb0b55a | 2251 | if (!tcp_conn->sock) { |
fd7255f5 MC |
2252 | mutex_unlock(&conn->xmitmutex); |
2253 | return -EINVAL; | |
2254 | } | |
2255 | ||
5bb0b55a | 2256 | inet = inet_sk(tcp_conn->sock->sk); |
5c75b7fc | 2257 | len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport)); |
fd7255f5 | 2258 | mutex_unlock(&conn->xmitmutex); |
8d2860b3 | 2259 | break; |
fd7255f5 MC |
2260 | case ISCSI_PARAM_CONN_ADDRESS: |
2261 | mutex_lock(&conn->xmitmutex); | |
5bb0b55a | 2262 | if (!tcp_conn->sock) { |
fd7255f5 MC |
2263 | mutex_unlock(&conn->xmitmutex); |
2264 | return -EINVAL; | |
2265 | } | |
2266 | ||
5bb0b55a | 2267 | sk = tcp_conn->sock->sk; |
fd7255f5 MC |
2268 | if (sk->sk_family == PF_INET) { |
2269 | inet = inet_sk(sk); | |
2270 | len = sprintf(buf, "%u.%u.%u.%u\n", | |
2271 | NIPQUAD(inet->daddr)); | |
2272 | } else { | |
2273 | np = inet6_sk(sk); | |
2274 | len = sprintf(buf, | |
2275 | "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
2276 | NIP6(np->daddr)); | |
2277 | } | |
2278 | mutex_unlock(&conn->xmitmutex); | |
2279 | break; | |
2280 | default: | |
5c75b7fc | 2281 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
2282 | } |
2283 | ||
2284 | return len; | |
2285 | } | |
2286 | ||
7ba24713 | 2287 | static void |
7b7232f3 | 2288 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 2289 | { |
7b7232f3 | 2290 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2291 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
2292 | |
2293 | stats->txdata_octets = conn->txdata_octets; | |
2294 | stats->rxdata_octets = conn->rxdata_octets; | |
2295 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
2296 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
2297 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
2298 | stats->datain_pdus = conn->datain_pdus_cnt; | |
2299 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
2300 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
2301 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
2302 | stats->custom_length = 3; | |
2303 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 2304 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 2305 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 2306 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
2307 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
2308 | stats->custom[2].value = conn->eh_abort_cnt; | |
2309 | } | |
2310 | ||
5bb0b55a MC |
2311 | static struct iscsi_cls_session * |
2312 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, | |
2313 | struct scsi_transport_template *scsit, | |
2314 | uint32_t initial_cmdsn, uint32_t *hostno) | |
7ba24713 | 2315 | { |
5bb0b55a MC |
2316 | struct iscsi_cls_session *cls_session; |
2317 | struct iscsi_session *session; | |
2318 | uint32_t hn; | |
2319 | int cmd_i; | |
7ba24713 | 2320 | |
5bb0b55a MC |
2321 | cls_session = iscsi_session_setup(iscsit, scsit, |
2322 | sizeof(struct iscsi_tcp_cmd_task), | |
2323 | sizeof(struct iscsi_tcp_mgmt_task), | |
2324 | initial_cmdsn, &hn); | |
2325 | if (!cls_session) | |
2326 | return NULL; | |
2327 | *hostno = hn; | |
7ba24713 | 2328 | |
5bb0b55a MC |
2329 | session = class_to_transport_session(cls_session); |
2330 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2331 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
2332 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2333 | ||
2334 | ctask->hdr = &tcp_ctask->hdr; | |
2335 | } | |
2336 | ||
2337 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
2338 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
2339 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
2340 | ||
2341 | mtask->hdr = &tcp_mtask->hdr; | |
2342 | } | |
2343 | ||
2344 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) | |
2345 | goto r2tpool_alloc_fail; | |
2346 | ||
2347 | return cls_session; | |
2348 | ||
2349 | r2tpool_alloc_fail: | |
2350 | iscsi_session_teardown(cls_session); | |
2351 | return NULL; | |
2352 | } | |
2353 | ||
2354 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
2355 | { | |
5bb0b55a MC |
2356 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
2357 | iscsi_session_teardown(cls_session); | |
7ba24713 AA |
2358 | } |
2359 | ||
5bb0b55a | 2360 | static struct scsi_host_template iscsi_sht = { |
e0ecae8d MC |
2361 | .name = "iSCSI Initiator over TCP/IP, v" |
2362 | ISCSI_TCP_VERSION, | |
5bb0b55a MC |
2363 | .queuecommand = iscsi_queuecommand, |
2364 | .change_queue_depth = iscsi_change_queue_depth, | |
2365 | .can_queue = ISCSI_XMIT_CMDS_MAX - 1, | |
2366 | .sg_tablesize = ISCSI_SG_TABLESIZE, | |
2367 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, | |
2368 | .eh_abort_handler = iscsi_eh_abort, | |
2369 | .eh_host_reset_handler = iscsi_eh_host_reset, | |
2370 | .use_clustering = DISABLE_CLUSTERING, | |
2371 | .proc_name = "iscsi_tcp", | |
2372 | .this_id = -1, | |
2373 | }; | |
2374 | ||
7ba24713 AA |
2375 | static struct iscsi_transport iscsi_tcp_transport = { |
2376 | .owner = THIS_MODULE, | |
2377 | .name = "tcp", | |
2378 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
2379 | | CAP_DATADGST, | |
fd7255f5 MC |
2380 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
2381 | ISCSI_MAX_XMIT_DLENGTH | | |
2382 | ISCSI_HDRDGST_EN | | |
2383 | ISCSI_DATADGST_EN | | |
2384 | ISCSI_INITIAL_R2T_EN | | |
2385 | ISCSI_MAX_R2T | | |
2386 | ISCSI_IMM_DATA_EN | | |
2387 | ISCSI_FIRST_BURST | | |
2388 | ISCSI_MAX_BURST | | |
2389 | ISCSI_PDU_INORDER_EN | | |
2390 | ISCSI_DATASEQ_INORDER_EN | | |
2391 | ISCSI_ERL | | |
2392 | ISCSI_CONN_PORT | | |
8d2860b3 | 2393 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
2394 | ISCSI_EXP_STATSN | |
2395 | ISCSI_PERSISTENT_PORT | | |
2396 | ISCSI_PERSISTENT_ADDRESS | | |
2397 | ISCSI_TARGET_NAME | | |
2398 | ISCSI_TPGT, | |
7ba24713 | 2399 | .host_template = &iscsi_sht, |
7b8631b5 | 2400 | .conndata_size = sizeof(struct iscsi_conn), |
7ba24713 AA |
2401 | .max_conn = 1, |
2402 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, | |
5bb0b55a MC |
2403 | /* session management */ |
2404 | .create_session = iscsi_tcp_session_create, | |
2405 | .destroy_session = iscsi_tcp_session_destroy, | |
2406 | /* connection management */ | |
2407 | .create_conn = iscsi_tcp_conn_create, | |
2408 | .bind_conn = iscsi_tcp_conn_bind, | |
2409 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 2410 | .set_param = iscsi_conn_set_param, |
5c75b7fc | 2411 | .get_conn_param = iscsi_tcp_conn_get_param, |
7b8631b5 | 2412 | .get_session_param = iscsi_session_get_param, |
7ba24713 AA |
2413 | .start_conn = iscsi_conn_start, |
2414 | .stop_conn = iscsi_conn_stop, | |
5bb0b55a MC |
2415 | /* these are called as part of conn recovery */ |
2416 | .suspend_conn_recv = iscsi_tcp_suspend_conn_rx, | |
2417 | .terminate_conn = iscsi_tcp_terminate_conn, | |
2418 | /* IO */ | |
7ba24713 AA |
2419 | .send_pdu = iscsi_conn_send_pdu, |
2420 | .get_stats = iscsi_conn_get_stats, | |
5bb0b55a MC |
2421 | .init_cmd_task = iscsi_tcp_cmd_init, |
2422 | .init_mgmt_task = iscsi_tcp_mgmt_init, | |
2423 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, | |
2424 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2425 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2426 | /* recovery */ | |
30a6c652 | 2427 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
2428 | }; |
2429 | ||
2430 | static int __init | |
2431 | iscsi_tcp_init(void) | |
2432 | { | |
7ba24713 | 2433 | if (iscsi_max_lun < 1) { |
be2df72e OG |
2434 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
2435 | iscsi_max_lun); | |
7ba24713 AA |
2436 | return -EINVAL; |
2437 | } | |
2438 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
2439 | ||
7b8631b5 | 2440 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
ffbfe925 | 2441 | return -ENODEV; |
7ba24713 | 2442 | |
7b8631b5 | 2443 | return 0; |
7ba24713 AA |
2444 | } |
2445 | ||
2446 | static void __exit | |
2447 | iscsi_tcp_exit(void) | |
2448 | { | |
2449 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
7ba24713 AA |
2450 | } |
2451 | ||
2452 | module_init(iscsi_tcp_init); | |
2453 | module_exit(iscsi_tcp_exit); |