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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); | |
275fd7d1 MC |
489 | if (rc) |
490 | return rc; | |
5bb0b55a MC |
491 | /* fall through */ |
492 | case ISCSI_OP_SCSI_CMD_RSP: | |
493 | tcp_conn->in.ctask = session->cmds[itt]; | |
494 | if (tcp_conn->in.datalen) | |
495 | goto copy_hdr; | |
7ba24713 | 496 | |
5bb0b55a | 497 | spin_lock(&session->lock); |
b6c395ed | 498 | iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask); |
5bb0b55a MC |
499 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); |
500 | spin_unlock(&session->lock); | |
501 | break; | |
502 | case ISCSI_OP_R2T: | |
503 | tcp_conn->in.ctask = session->cmds[itt]; | |
504 | if (ahslen) | |
505 | rc = ISCSI_ERR_AHSLEN; | |
506 | else if (tcp_conn->in.ctask->sc->sc_data_direction == | |
507 | DMA_TO_DEVICE) | |
508 | rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); | |
509 | else | |
510 | rc = ISCSI_ERR_PROTO; | |
511 | break; | |
512 | case ISCSI_OP_LOGIN_RSP: | |
513 | case ISCSI_OP_TEXT_RSP: | |
514 | case ISCSI_OP_LOGOUT_RSP: | |
515 | case ISCSI_OP_NOOP_IN: | |
516 | case ISCSI_OP_REJECT: | |
517 | case ISCSI_OP_ASYNC_EVENT: | |
518 | if (tcp_conn->in.datalen) | |
519 | goto copy_hdr; | |
520 | /* fall through */ | |
521 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
522 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
523 | break; | |
524 | default: | |
525 | rc = ISCSI_ERR_BAD_OPCODE; | |
526 | break; | |
527 | } | |
7ba24713 AA |
528 | |
529 | return rc; | |
5bb0b55a MC |
530 | |
531 | copy_hdr: | |
532 | /* | |
533 | * if we did zero copy for the header but we will need multiple | |
534 | * skbs to complete the command then we have to copy the header | |
535 | * for later use | |
536 | */ | |
275fd7d1 | 537 | if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <= |
5bb0b55a MC |
538 | (tcp_conn->in.datalen + tcp_conn->in.padding + |
539 | (conn->datadgst_en ? 4 : 0))) { | |
540 | debug_tcp("Copying header for later use. in.copy %d in.datalen" | |
541 | " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); | |
542 | memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, | |
543 | sizeof(struct iscsi_hdr)); | |
544 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
545 | tcp_conn->in.zero_copy_hdr = 0; | |
546 | } | |
547 | return 0; | |
7ba24713 AA |
548 | } |
549 | ||
550 | /** | |
551 | * iscsi_ctask_copy - copy skb bits to the destanation cmd task | |
5bb0b55a | 552 | * @conn: iscsi tcp connection |
7ba24713 AA |
553 | * @ctask: scsi command task |
554 | * @buf: buffer to copy to | |
555 | * @buf_size: size of buffer | |
556 | * @offset: offset within the buffer | |
557 | * | |
558 | * Notes: | |
559 | * The function calls skb_copy_bits() and updates per-connection and | |
560 | * per-cmd byte counters. | |
561 | * | |
562 | * Read counters (in bytes): | |
563 | * | |
564 | * conn->in.offset offset within in progress SKB | |
565 | * conn->in.copy left to copy from in progress SKB | |
566 | * including padding | |
567 | * conn->in.copied copied already from in progress SKB | |
568 | * conn->data_copied copied already from in progress buffer | |
569 | * ctask->sent total bytes sent up to the MidLayer | |
570 | * ctask->data_count left to copy from in progress Data-In | |
571 | * buf_left left to copy from in progress buffer | |
572 | **/ | |
573 | static inline int | |
5bb0b55a | 574 | iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, |
7ba24713 AA |
575 | void *buf, int buf_size, int offset) |
576 | { | |
5bb0b55a MC |
577 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
578 | int buf_left = buf_size - (tcp_conn->data_copied + offset); | |
579 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
580 | int rc; |
581 | ||
582 | size = min(size, ctask->data_count); | |
583 | ||
584 | debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 585 | size, tcp_conn->in.offset, tcp_conn->in.copied); |
7ba24713 AA |
586 | |
587 | BUG_ON(size <= 0); | |
5bb0b55a | 588 | BUG_ON(tcp_ctask->sent + size > ctask->total_length); |
7ba24713 | 589 | |
5bb0b55a MC |
590 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
591 | (char*)buf + (offset + tcp_conn->data_copied), size); | |
7ba24713 AA |
592 | /* must fit into skb->len */ |
593 | BUG_ON(rc); | |
594 | ||
5bb0b55a MC |
595 | tcp_conn->in.offset += size; |
596 | tcp_conn->in.copy -= size; | |
597 | tcp_conn->in.copied += size; | |
598 | tcp_conn->data_copied += size; | |
599 | tcp_ctask->sent += size; | |
7ba24713 AA |
600 | ctask->data_count -= size; |
601 | ||
5bb0b55a | 602 | BUG_ON(tcp_conn->in.copy < 0); |
7ba24713 AA |
603 | BUG_ON(ctask->data_count < 0); |
604 | ||
5bb0b55a | 605 | if (buf_size != (tcp_conn->data_copied + offset)) { |
7ba24713 | 606 | if (!ctask->data_count) { |
5bb0b55a | 607 | BUG_ON(buf_size - tcp_conn->data_copied < 0); |
7ba24713 | 608 | /* done with this PDU */ |
5bb0b55a | 609 | return buf_size - tcp_conn->data_copied; |
7ba24713 AA |
610 | } |
611 | return -EAGAIN; | |
612 | } | |
613 | ||
614 | /* done with this buffer or with both - PDU and buffer */ | |
5bb0b55a | 615 | tcp_conn->data_copied = 0; |
7ba24713 AA |
616 | return 0; |
617 | } | |
618 | ||
619 | /** | |
620 | * iscsi_tcp_copy - copy skb bits to the destanation buffer | |
5bb0b55a | 621 | * @conn: iscsi tcp connection |
7ba24713 AA |
622 | * |
623 | * Notes: | |
624 | * The function calls skb_copy_bits() and updates per-connection | |
625 | * byte counters. | |
626 | **/ | |
627 | static inline int | |
5bb0b55a | 628 | iscsi_tcp_copy(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 629 | { |
5bb0b55a MC |
630 | void *buf = tcp_conn->data; |
631 | int buf_size = tcp_conn->in.datalen; | |
632 | int buf_left = buf_size - tcp_conn->data_copied; | |
633 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
634 | int rc; |
635 | ||
636 | debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 637 | size, tcp_conn->in.offset, tcp_conn->data_copied); |
7ba24713 AA |
638 | BUG_ON(size <= 0); |
639 | ||
5bb0b55a MC |
640 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
641 | (char*)buf + tcp_conn->data_copied, size); | |
7ba24713 AA |
642 | BUG_ON(rc); |
643 | ||
5bb0b55a MC |
644 | tcp_conn->in.offset += size; |
645 | tcp_conn->in.copy -= size; | |
646 | tcp_conn->in.copied += size; | |
647 | tcp_conn->data_copied += size; | |
7ba24713 | 648 | |
5bb0b55a | 649 | if (buf_size != tcp_conn->data_copied) |
7ba24713 AA |
650 | return -EAGAIN; |
651 | ||
652 | return 0; | |
653 | } | |
654 | ||
655 | static inline void | |
5bb0b55a MC |
656 | partial_sg_digest_update(struct iscsi_tcp_conn *tcp_conn, |
657 | struct scatterlist *sg, int offset, int length) | |
7ba24713 AA |
658 | { |
659 | struct scatterlist temp; | |
660 | ||
661 | memcpy(&temp, sg, sizeof(struct scatterlist)); | |
662 | temp.offset = offset; | |
663 | temp.length = length; | |
5bb0b55a | 664 | crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1); |
7ba24713 AA |
665 | } |
666 | ||
f6cfba1d | 667 | static void |
5bb0b55a | 668 | iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) |
f6cfba1d MC |
669 | { |
670 | struct scatterlist tmp; | |
671 | ||
672 | sg_init_one(&tmp, buf, len); | |
5bb0b55a | 673 | crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1); |
f6cfba1d MC |
674 | } |
675 | ||
7ba24713 AA |
676 | static int iscsi_scsi_data_in(struct iscsi_conn *conn) |
677 | { | |
5bb0b55a MC |
678 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
679 | struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; | |
680 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 681 | struct scsi_cmnd *sc = ctask->sc; |
f6cfba1d | 682 | struct scatterlist *sg; |
7ba24713 AA |
683 | int i, offset, rc = 0; |
684 | ||
685 | BUG_ON((void*)ctask != sc->SCp.ptr); | |
686 | ||
687 | /* | |
688 | * copying Data-In into the Scsi_Cmnd | |
689 | */ | |
690 | if (!sc->use_sg) { | |
691 | i = ctask->data_count; | |
5bb0b55a MC |
692 | rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, |
693 | sc->request_bufflen, | |
694 | tcp_ctask->data_offset); | |
7ba24713 AA |
695 | if (rc == -EAGAIN) |
696 | return rc; | |
42f72aa9 | 697 | if (conn->datadgst_en) |
5bb0b55a MC |
698 | iscsi_recv_digest_update(tcp_conn, sc->request_buffer, |
699 | i); | |
7ba24713 AA |
700 | rc = 0; |
701 | goto done; | |
702 | } | |
703 | ||
5bb0b55a | 704 | offset = tcp_ctask->data_offset; |
7ba24713 AA |
705 | sg = sc->request_buffer; |
706 | ||
5bb0b55a MC |
707 | if (tcp_ctask->data_offset) |
708 | for (i = 0; i < tcp_ctask->sg_count; i++) | |
7ba24713 AA |
709 | offset -= sg[i].length; |
710 | /* we've passed through partial sg*/ | |
711 | if (offset < 0) | |
712 | offset = 0; | |
713 | ||
5bb0b55a | 714 | for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { |
7ba24713 AA |
715 | char *dest; |
716 | ||
717 | dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); | |
5bb0b55a | 718 | rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, |
7ba24713 AA |
719 | sg[i].length, offset); |
720 | kunmap_atomic(dest, KM_SOFTIRQ0); | |
721 | if (rc == -EAGAIN) | |
722 | /* continue with the next SKB/PDU */ | |
723 | return rc; | |
724 | if (!rc) { | |
725 | if (conn->datadgst_en) { | |
726 | if (!offset) | |
5bb0b55a MC |
727 | crypto_digest_update( |
728 | tcp_conn->data_rx_tfm, | |
729 | &sg[i], 1); | |
7ba24713 | 730 | else |
5bb0b55a MC |
731 | partial_sg_digest_update(tcp_conn, |
732 | &sg[i], | |
7ba24713 AA |
733 | sg[i].offset + offset, |
734 | sg[i].length - offset); | |
735 | } | |
736 | offset = 0; | |
5bb0b55a | 737 | tcp_ctask->sg_count++; |
7ba24713 AA |
738 | } |
739 | ||
740 | if (!ctask->data_count) { | |
741 | if (rc && conn->datadgst_en) | |
742 | /* | |
743 | * data-in is complete, but buffer not... | |
744 | */ | |
5bb0b55a | 745 | partial_sg_digest_update(tcp_conn, &sg[i], |
7ba24713 AA |
746 | sg[i].offset, sg[i].length-rc); |
747 | rc = 0; | |
748 | break; | |
749 | } | |
750 | ||
5bb0b55a | 751 | if (!tcp_conn->in.copy) |
7ba24713 AA |
752 | return -EAGAIN; |
753 | } | |
754 | BUG_ON(ctask->data_count); | |
755 | ||
756 | done: | |
757 | /* check for non-exceptional status */ | |
5bb0b55a | 758 | if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { |
b6c395ed MC |
759 | debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n", |
760 | (long)sc, sc->result, ctask->itt, | |
761 | tcp_conn->in.hdr->flags); | |
5bb0b55a | 762 | spin_lock(&conn->session->lock); |
b6c395ed | 763 | iscsi_tcp_cleanup_ctask(conn, ctask); |
5bb0b55a MC |
764 | __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); |
765 | spin_unlock(&conn->session->lock); | |
7ba24713 AA |
766 | } |
767 | ||
768 | return rc; | |
769 | } | |
770 | ||
771 | static int | |
772 | iscsi_data_recv(struct iscsi_conn *conn) | |
773 | { | |
5bb0b55a MC |
774 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
775 | int rc = 0, opcode; | |
7ba24713 | 776 | |
5bb0b55a MC |
777 | opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
778 | switch (opcode) { | |
7ba24713 AA |
779 | case ISCSI_OP_SCSI_DATA_IN: |
780 | rc = iscsi_scsi_data_in(conn); | |
781 | break; | |
5bb0b55a MC |
782 | case ISCSI_OP_SCSI_CMD_RSP: |
783 | spin_lock(&conn->session->lock); | |
b6c395ed | 784 | iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask); |
5bb0b55a | 785 | spin_unlock(&conn->session->lock); |
7ba24713 AA |
786 | case ISCSI_OP_TEXT_RSP: |
787 | case ISCSI_OP_LOGIN_RSP: | |
5bb0b55a MC |
788 | case ISCSI_OP_NOOP_IN: |
789 | case ISCSI_OP_ASYNC_EVENT: | |
790 | case ISCSI_OP_REJECT: | |
7ba24713 AA |
791 | /* |
792 | * Collect data segment to the connection's data | |
793 | * placeholder | |
794 | */ | |
5bb0b55a | 795 | if (iscsi_tcp_copy(tcp_conn)) { |
7ba24713 AA |
796 | rc = -EAGAIN; |
797 | goto exit; | |
798 | } | |
799 | ||
5bb0b55a MC |
800 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, tcp_conn->data, |
801 | tcp_conn->in.datalen); | |
802 | if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) | |
803 | iscsi_recv_digest_update(tcp_conn, tcp_conn->data, | |
804 | tcp_conn->in.datalen); | |
805 | break; | |
7ba24713 AA |
806 | default: |
807 | BUG_ON(1); | |
808 | } | |
809 | exit: | |
810 | return rc; | |
811 | } | |
812 | ||
813 | /** | |
814 | * iscsi_tcp_data_recv - TCP receive in sendfile fashion | |
815 | * @rd_desc: read descriptor | |
816 | * @skb: socket buffer | |
817 | * @offset: offset in skb | |
818 | * @len: skb->len - offset | |
819 | **/ | |
820 | static int | |
821 | iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
822 | unsigned int offset, size_t len) | |
823 | { | |
824 | int rc; | |
825 | struct iscsi_conn *conn = rd_desc->arg.data; | |
5bb0b55a | 826 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
827 | int processed; |
828 | char pad[ISCSI_PAD_LEN]; | |
829 | struct scatterlist sg; | |
830 | ||
831 | /* | |
832 | * Save current SKB and its offset in the corresponding | |
833 | * connection context. | |
834 | */ | |
5bb0b55a MC |
835 | tcp_conn->in.copy = skb->len - offset; |
836 | tcp_conn->in.offset = offset; | |
837 | tcp_conn->in.skb = skb; | |
838 | tcp_conn->in.len = tcp_conn->in.copy; | |
839 | BUG_ON(tcp_conn->in.copy <= 0); | |
840 | debug_tcp("in %d bytes\n", tcp_conn->in.copy); | |
7ba24713 AA |
841 | |
842 | more: | |
5bb0b55a | 843 | tcp_conn->in.copied = 0; |
7ba24713 AA |
844 | rc = 0; |
845 | ||
846 | if (unlikely(conn->suspend_rx)) { | |
847 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
848 | return 0; | |
849 | } | |
850 | ||
5bb0b55a MC |
851 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || |
852 | tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { | |
853 | rc = iscsi_hdr_extract(tcp_conn); | |
7ba24713 AA |
854 | if (rc) { |
855 | if (rc == -EAGAIN) | |
856 | goto nomore; | |
857 | else { | |
d82967c7 | 858 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
859 | return 0; |
860 | } | |
861 | } | |
862 | ||
863 | /* | |
864 | * Verify and process incoming PDU header. | |
865 | */ | |
5bb0b55a MC |
866 | rc = iscsi_tcp_hdr_recv(conn); |
867 | if (!rc && tcp_conn->in.datalen) { | |
8a47cd34 | 868 | if (conn->datadgst_en) { |
5bb0b55a MC |
869 | BUG_ON(!tcp_conn->data_rx_tfm); |
870 | crypto_digest_init(tcp_conn->data_rx_tfm); | |
7ba24713 | 871 | } |
5bb0b55a | 872 | tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; |
7ba24713 | 873 | } else if (rc) { |
d82967c7 | 874 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
875 | return 0; |
876 | } | |
877 | } | |
878 | ||
5bb0b55a | 879 | if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { |
f6cfba1d | 880 | uint32_t recv_digest; |
5bb0b55a | 881 | |
7ba24713 | 882 | debug_tcp("extra data_recv offset %d copy %d\n", |
5bb0b55a MC |
883 | tcp_conn->in.offset, tcp_conn->in.copy); |
884 | skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, | |
f6cfba1d | 885 | &recv_digest, 4); |
5bb0b55a MC |
886 | tcp_conn->in.offset += 4; |
887 | tcp_conn->in.copy -= 4; | |
888 | if (recv_digest != tcp_conn->in.datadgst) { | |
f6cfba1d MC |
889 | debug_tcp("iscsi_tcp: data digest error!" |
890 | "0x%x != 0x%x\n", recv_digest, | |
5bb0b55a | 891 | tcp_conn->in.datadgst); |
f6cfba1d MC |
892 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
893 | return 0; | |
894 | } else { | |
895 | debug_tcp("iscsi_tcp: data digest match!" | |
896 | "0x%x == 0x%x\n", recv_digest, | |
5bb0b55a MC |
897 | tcp_conn->in.datadgst); |
898 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
899 | } |
900 | } | |
901 | ||
5bb0b55a MC |
902 | if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && |
903 | tcp_conn->in.copy) { | |
7ba24713 AA |
904 | |
905 | debug_tcp("data_recv offset %d copy %d\n", | |
5bb0b55a | 906 | tcp_conn->in.offset, tcp_conn->in.copy); |
7ba24713 AA |
907 | |
908 | rc = iscsi_data_recv(conn); | |
909 | if (rc) { | |
665b44ae | 910 | if (rc == -EAGAIN) |
7ba24713 | 911 | goto again; |
d82967c7 | 912 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
913 | return 0; |
914 | } | |
5bb0b55a MC |
915 | tcp_conn->in.copy -= tcp_conn->in.padding; |
916 | tcp_conn->in.offset += tcp_conn->in.padding; | |
8a47cd34 | 917 | if (conn->datadgst_en) { |
5bb0b55a MC |
918 | if (tcp_conn->in.padding) { |
919 | debug_tcp("padding -> %d\n", | |
920 | tcp_conn->in.padding); | |
921 | memset(pad, 0, tcp_conn->in.padding); | |
922 | sg_init_one(&sg, pad, tcp_conn->in.padding); | |
923 | crypto_digest_update(tcp_conn->data_rx_tfm, | |
924 | &sg, 1); | |
7ba24713 | 925 | } |
5bb0b55a MC |
926 | crypto_digest_final(tcp_conn->data_rx_tfm, |
927 | (u8 *) & tcp_conn->in.datadgst); | |
928 | debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); | |
929 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; | |
7ba24713 | 930 | } else |
5bb0b55a | 931 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
7ba24713 AA |
932 | } |
933 | ||
934 | debug_tcp("f, processed %d from out of %d padding %d\n", | |
5bb0b55a MC |
935 | tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); |
936 | BUG_ON(tcp_conn->in.offset - offset > len); | |
7ba24713 | 937 | |
5bb0b55a | 938 | if (tcp_conn->in.offset - offset != len) { |
7ba24713 | 939 | debug_tcp("continue to process %d bytes\n", |
5bb0b55a | 940 | (int)len - (tcp_conn->in.offset - offset)); |
7ba24713 AA |
941 | goto more; |
942 | } | |
943 | ||
944 | nomore: | |
5bb0b55a | 945 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
946 | BUG_ON(processed == 0); |
947 | return processed; | |
948 | ||
949 | again: | |
5bb0b55a | 950 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
951 | debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", |
952 | processed, (int)len, (int)rd_desc->count); | |
953 | BUG_ON(processed == 0); | |
954 | BUG_ON(processed > len); | |
955 | ||
956 | conn->rxdata_octets += processed; | |
957 | return processed; | |
958 | } | |
959 | ||
960 | static void | |
961 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
962 | { | |
963 | struct iscsi_conn *conn = sk->sk_user_data; | |
964 | read_descriptor_t rd_desc; | |
965 | ||
966 | read_lock(&sk->sk_callback_lock); | |
967 | ||
665b44ae MC |
968 | /* |
969 | * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv. | |
970 | * We set count to 1 because we want the network layer to | |
971 | * hand us all the skbs that are available. iscsi_tcp_data_recv | |
972 | * handled pdus that cross buffers or pdus that still need data. | |
973 | */ | |
7ba24713 | 974 | rd_desc.arg.data = conn; |
665b44ae | 975 | rd_desc.count = 1; |
7ba24713 AA |
976 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); |
977 | ||
978 | read_unlock(&sk->sk_callback_lock); | |
979 | } | |
980 | ||
981 | static void | |
982 | iscsi_tcp_state_change(struct sock *sk) | |
983 | { | |
5bb0b55a | 984 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
985 | struct iscsi_conn *conn; |
986 | struct iscsi_session *session; | |
987 | void (*old_state_change)(struct sock *); | |
988 | ||
989 | read_lock(&sk->sk_callback_lock); | |
990 | ||
991 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
992 | session = conn->session; | |
993 | ||
e6273993 MC |
994 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
995 | sk->sk_state == TCP_CLOSE) && | |
996 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
997 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
998 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
999 | } | |
1000 | ||
5bb0b55a MC |
1001 | tcp_conn = conn->dd_data; |
1002 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
1003 | |
1004 | read_unlock(&sk->sk_callback_lock); | |
1005 | ||
1006 | old_state_change(sk); | |
1007 | } | |
1008 | ||
1009 | /** | |
1010 | * iscsi_write_space - Called when more output buffer space is available | |
1011 | * @sk: socket space is available for | |
1012 | **/ | |
1013 | static void | |
1014 | iscsi_write_space(struct sock *sk) | |
1015 | { | |
1016 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1017 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1018 | ||
1019 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1020 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
55e3299d | 1021 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1022 | } |
1023 | ||
1024 | static void | |
1025 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1026 | { | |
5bb0b55a MC |
1027 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1028 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1029 | |
1030 | /* assign new callbacks */ | |
1031 | write_lock_bh(&sk->sk_callback_lock); | |
1032 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1033 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1034 | tcp_conn->old_state_change = sk->sk_state_change; | |
1035 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1036 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1037 | sk->sk_state_change = iscsi_tcp_state_change; | |
1038 | sk->sk_write_space = iscsi_write_space; | |
1039 | write_unlock_bh(&sk->sk_callback_lock); | |
1040 | } | |
1041 | ||
1042 | static void | |
1c83469d | 1043 | iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 1044 | { |
5bb0b55a | 1045 | struct sock *sk = tcp_conn->sock->sk; |
7ba24713 AA |
1046 | |
1047 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1048 | write_lock_bh(&sk->sk_callback_lock); | |
1049 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1050 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1051 | sk->sk_state_change = tcp_conn->old_state_change; | |
1052 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1053 | sk->sk_no_check = 0; |
1054 | write_unlock_bh(&sk->sk_callback_lock); | |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * iscsi_send - generic send routine | |
1059 | * @sk: kernel's socket | |
1060 | * @buf: buffer to write from | |
1061 | * @size: actual size to write | |
1062 | * @flags: socket's flags | |
7ba24713 AA |
1063 | */ |
1064 | static inline int | |
56851698 | 1065 | iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
7ba24713 | 1066 | { |
5bb0b55a MC |
1067 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1068 | struct socket *sk = tcp_conn->sock; | |
3219e529 | 1069 | int offset = buf->sg.offset + buf->sent, res; |
7ba24713 | 1070 | |
7cae5159 MC |
1071 | /* |
1072 | * if we got use_sg=0 or are sending something we kmallocd | |
1073 | * then we did not have to do kmap (kmap returns page_address) | |
1074 | * | |
1075 | * if we got use_sg > 0, but had to drop down, we do not | |
1076 | * set clustering so this should only happen for that | |
1077 | * slab case. | |
1078 | */ | |
1079 | if (buf->use_sendmsg) | |
3219e529 | 1080 | res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags); |
7cae5159 | 1081 | else |
3219e529 MC |
1082 | res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags); |
1083 | ||
1084 | if (res >= 0) { | |
1085 | conn->txdata_octets += res; | |
1086 | buf->sent += res; | |
1087 | return res; | |
1088 | } | |
1089 | ||
1090 | tcp_conn->sendpage_failures_cnt++; | |
1091 | if (res == -EAGAIN) | |
1092 | res = -ENOBUFS; | |
1093 | else | |
1094 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1095 | return res; | |
7ba24713 AA |
1096 | } |
1097 | ||
1098 | /** | |
1099 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() | |
1100 | * @conn: iscsi connection | |
1101 | * @buf: buffer to write from | |
1102 | * @datalen: lenght of data to be sent after the header | |
1103 | * | |
1104 | * Notes: | |
1105 | * (Tx, Fast Path) | |
1106 | **/ | |
1107 | static inline int | |
1108 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) | |
1109 | { | |
7ba24713 AA |
1110 | int flags = 0; /* MSG_DONTWAIT; */ |
1111 | int res, size; | |
1112 | ||
1113 | size = buf->sg.length - buf->sent; | |
1114 | BUG_ON(buf->sent + size > buf->sg.length); | |
1115 | if (buf->sent + size != buf->sg.length || datalen) | |
1116 | flags |= MSG_MORE; | |
1117 | ||
56851698 | 1118 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1119 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
1120 | if (res >= 0) { | |
7ba24713 AA |
1121 | if (size != res) |
1122 | return -EAGAIN; | |
1123 | return 0; | |
3219e529 | 1124 | } |
7ba24713 AA |
1125 | |
1126 | return res; | |
1127 | } | |
1128 | ||
1129 | /** | |
1130 | * iscsi_sendpage - send one page of iSCSI Data-Out. | |
1131 | * @conn: iscsi connection | |
1132 | * @buf: buffer to write from | |
1133 | * @count: remaining data | |
1134 | * @sent: number of bytes sent | |
1135 | * | |
1136 | * Notes: | |
1137 | * (Tx, Fast Path) | |
1138 | **/ | |
1139 | static inline int | |
1140 | iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, | |
1141 | int *count, int *sent) | |
1142 | { | |
7ba24713 AA |
1143 | int flags = 0; /* MSG_DONTWAIT; */ |
1144 | int res, size; | |
1145 | ||
1146 | size = buf->sg.length - buf->sent; | |
1147 | BUG_ON(buf->sent + size > buf->sg.length); | |
1148 | if (size > *count) | |
1149 | size = *count; | |
b13941f6 | 1150 | if (buf->sent + size != buf->sg.length || *count != size) |
7ba24713 AA |
1151 | flags |= MSG_MORE; |
1152 | ||
56851698 | 1153 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1154 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
1155 | size, buf->sent, *count, *sent, res); | |
1156 | if (res >= 0) { | |
7ba24713 AA |
1157 | *count -= res; |
1158 | *sent += res; | |
1159 | if (size != res) | |
1160 | return -EAGAIN; | |
1161 | return 0; | |
3219e529 | 1162 | } |
7ba24713 AA |
1163 | |
1164 | return res; | |
1165 | } | |
1166 | ||
1167 | static inline void | |
5bb0b55a MC |
1168 | iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
1169 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1170 | { |
5bb0b55a MC |
1171 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1172 | ||
1173 | BUG_ON(!tcp_conn->data_tx_tfm); | |
1174 | crypto_digest_init(tcp_conn->data_tx_tfm); | |
1175 | tcp_ctask->digest_count = 4; | |
7ba24713 AA |
1176 | } |
1177 | ||
858119e1 | 1178 | static int |
7ba24713 AA |
1179 | iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
1180 | struct iscsi_buf *buf, uint32_t *digest, int final) | |
1181 | { | |
5bb0b55a MC |
1182 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1183 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 AA |
1184 | int rc = 0; |
1185 | int sent = 0; | |
1186 | ||
1187 | if (final) | |
5bb0b55a | 1188 | crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest); |
7ba24713 | 1189 | |
6e458cc9 | 1190 | iscsi_buf_init_iov(buf, (char*)digest, 4); |
5bb0b55a | 1191 | rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
7ba24713 | 1192 | if (rc) { |
5bb0b55a MC |
1193 | tcp_ctask->datadigest = *digest; |
1194 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; | |
7ba24713 | 1195 | } else |
5bb0b55a | 1196 | tcp_ctask->digest_count = 4; |
7ba24713 AA |
1197 | return rc; |
1198 | } | |
1199 | ||
1200 | /** | |
1201 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1202 | * @conn: iscsi connection | |
1203 | * @ctask: scsi command task | |
1204 | * @r2t: R2T info | |
1205 | * @left: bytes left to transfer | |
1206 | * | |
1207 | * Notes: | |
1208 | * Initialize next Data-Out within this R2T sequence and continue | |
1209 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1210 | * | |
1211 | * Called under connection lock. | |
1212 | **/ | |
1213 | static void | |
1214 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1215 | struct iscsi_r2t_info *r2t, int left) | |
1216 | { | |
5bb0b55a | 1217 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1218 | struct iscsi_data *hdr; |
7ba24713 AA |
1219 | struct scsi_cmnd *sc = ctask->sc; |
1220 | int new_offset; | |
1221 | ||
ffbfe925 | 1222 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
1223 | memset(hdr, 0, sizeof(struct iscsi_data)); |
1224 | hdr->ttt = r2t->ttt; | |
1225 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1226 | r2t->solicit_datasn++; | |
1227 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
1228 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
1229 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
1230 | hdr->exp_statsn = r2t->exp_statsn; |
1231 | new_offset = r2t->data_offset + r2t->sent; | |
1232 | hdr->offset = cpu_to_be32(new_offset); | |
1233 | if (left > conn->max_xmit_dlength) { | |
1234 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1235 | r2t->data_count = conn->max_xmit_dlength; | |
1236 | } else { | |
1237 | hton24(hdr->dlength, left); | |
1238 | r2t->data_count = left; | |
1239 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1240 | } | |
1241 | conn->dataout_pdus_cnt++; | |
1242 | ||
6e458cc9 | 1243 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 1244 | sizeof(struct iscsi_hdr)); |
7ba24713 | 1245 | |
7ba24713 | 1246 | if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { |
5bb0b55a | 1247 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
7ba24713 AA |
1248 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1249 | r2t->sg += 1; | |
1250 | } else | |
5bb0b55a | 1251 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
7ba24713 AA |
1252 | (char*)sc->request_buffer + new_offset, |
1253 | r2t->data_count); | |
7ba24713 AA |
1254 | } |
1255 | ||
1256 | static void | |
1257 | iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1258 | { | |
5bb0b55a | 1259 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1260 | struct iscsi_data_task *dtask; |
1261 | ||
ffbfe925 | 1262 | dtask = tcp_ctask->dtask = &tcp_ctask->unsol_dtask; |
5bb0b55a MC |
1263 | iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr, |
1264 | tcp_ctask->r2t_data_count); | |
6e458cc9 | 1265 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, |
af973481 | 1266 | sizeof(struct iscsi_hdr)); |
7ba24713 AA |
1267 | } |
1268 | ||
1269 | /** | |
5bb0b55a | 1270 | * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 AA |
1271 | * @conn: iscsi connection |
1272 | * @ctask: scsi command task | |
1273 | * @sc: scsi command | |
1274 | **/ | |
1275 | static void | |
5bb0b55a | 1276 | iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
7ba24713 | 1277 | { |
5bb0b55a MC |
1278 | struct scsi_cmnd *sc = ctask->sc; |
1279 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 1280 | |
5bb0b55a | 1281 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
7ba24713 | 1282 | |
5bb0b55a MC |
1283 | tcp_ctask->sent = 0; |
1284 | tcp_ctask->sg_count = 0; | |
7ba24713 AA |
1285 | |
1286 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
5bb0b55a MC |
1287 | tcp_ctask->xmstate = XMSTATE_W_HDR; |
1288 | tcp_ctask->exp_r2tsn = 0; | |
7ba24713 | 1289 | BUG_ON(ctask->total_length == 0); |
5bb0b55a | 1290 | |
7ba24713 AA |
1291 | if (sc->use_sg) { |
1292 | struct scatterlist *sg = sc->request_buffer; | |
1293 | ||
5bb0b55a MC |
1294 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1295 | &sg[tcp_ctask->sg_count++]); | |
1296 | tcp_ctask->sg = sg; | |
1297 | tcp_ctask->bad_sg = sg + sc->use_sg; | |
1298 | } else | |
1299 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, | |
1300 | sc->request_buffer, | |
1301 | sc->request_bufflen); | |
7ba24713 | 1302 | |
5bb0b55a MC |
1303 | if (ctask->imm_count) |
1304 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; | |
1305 | ||
1306 | tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); | |
1307 | if (tcp_ctask->pad_count) { | |
1308 | tcp_ctask->pad_count = ISCSI_PAD_LEN - | |
1309 | tcp_ctask->pad_count; | |
7ba24713 | 1310 | debug_scsi("write padding %d bytes\n", |
5bb0b55a MC |
1311 | tcp_ctask->pad_count); |
1312 | tcp_ctask->xmstate |= XMSTATE_W_PAD; | |
7ba24713 | 1313 | } |
7ba24713 | 1314 | |
5bb0b55a MC |
1315 | if (ctask->unsol_count) |
1316 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR | | |
1317 | XMSTATE_UNS_INIT; | |
1318 | tcp_ctask->r2t_data_count = ctask->total_length - | |
7ba24713 AA |
1319 | ctask->imm_count - |
1320 | ctask->unsol_count; | |
1321 | ||
b6c395ed | 1322 | debug_scsi("cmd [itt 0x%x total %d imm %d imm_data %d " |
7ba24713 AA |
1323 | "r2t_data %d]\n", |
1324 | ctask->itt, ctask->total_length, ctask->imm_count, | |
5bb0b55a MC |
1325 | ctask->unsol_count, tcp_ctask->r2t_data_count); |
1326 | } else | |
1327 | tcp_ctask->xmstate = XMSTATE_R_HDR; | |
7ba24713 | 1328 | |
6e458cc9 | 1329 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, |
af973481 | 1330 | sizeof(struct iscsi_hdr)); |
7ba24713 AA |
1331 | } |
1332 | ||
1333 | /** | |
5bb0b55a | 1334 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
7ba24713 AA |
1335 | * @conn: iscsi connection |
1336 | * @mtask: task management task | |
1337 | * | |
1338 | * Notes: | |
1339 | * The function can return -EAGAIN in which case caller must | |
1340 | * call it again later, or recover. '0' return code means successful | |
1341 | * xmit. | |
1342 | * | |
1343 | * Management xmit state machine consists of two states: | |
1344 | * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress | |
1345 | * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress | |
1346 | **/ | |
1347 | static int | |
5bb0b55a | 1348 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1349 | { |
5bb0b55a | 1350 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
3219e529 | 1351 | int rc; |
7ba24713 AA |
1352 | |
1353 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", | |
5bb0b55a | 1354 | conn->id, tcp_mtask->xmstate, mtask->itt); |
7ba24713 | 1355 | |
5bb0b55a MC |
1356 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { |
1357 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; | |
7ba24713 | 1358 | if (mtask->data_count) |
5bb0b55a | 1359 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
af973481 | 1360 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
30a6c652 | 1361 | conn->stop_stage != STOP_CONN_RECOVER && |
af973481 | 1362 | conn->hdrdgst_en) |
5bb0b55a MC |
1363 | iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
1364 | (u8*)tcp_mtask->hdrext); | |
3219e529 MC |
1365 | rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf, |
1366 | mtask->data_count); | |
1367 | if (rc) { | |
5bb0b55a | 1368 | tcp_mtask->xmstate |= XMSTATE_IMM_HDR; |
7ba24713 | 1369 | if (mtask->data_count) |
5bb0b55a | 1370 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
3219e529 | 1371 | return rc; |
7ba24713 AA |
1372 | } |
1373 | } | |
1374 | ||
5bb0b55a | 1375 | if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 | 1376 | BUG_ON(!mtask->data_count); |
5bb0b55a | 1377 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1378 | /* FIXME: implement. |
1379 | * Virtual buffer could be spreaded across multiple pages... | |
1380 | */ | |
1381 | do { | |
3219e529 MC |
1382 | int rc; |
1383 | ||
1384 | rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf, | |
1385 | &mtask->data_count, &tcp_mtask->sent); | |
1386 | if (rc) { | |
5bb0b55a | 1387 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
3219e529 | 1388 | return rc; |
7ba24713 AA |
1389 | } |
1390 | } while (mtask->data_count); | |
1391 | } | |
1392 | ||
5bb0b55a MC |
1393 | BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
1394 | if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
1395 | struct iscsi_session *session = conn->session; | |
1396 | ||
1397 | spin_lock_bh(&session->lock); | |
1398 | list_del(&conn->mtask->running); | |
1399 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, | |
1400 | sizeof(void*)); | |
1401 | spin_unlock_bh(&session->lock); | |
1402 | } | |
7ba24713 AA |
1403 | return 0; |
1404 | } | |
1405 | ||
1406 | static inline int | |
5bb0b55a MC |
1407 | handle_xmstate_r_hdr(struct iscsi_conn *conn, |
1408 | struct iscsi_tcp_cmd_task *tcp_ctask) | |
7ba24713 | 1409 | { |
3219e529 MC |
1410 | int rc; |
1411 | ||
5bb0b55a | 1412 | tcp_ctask->xmstate &= ~XMSTATE_R_HDR; |
42f72aa9 | 1413 | if (conn->hdrdgst_en) |
5bb0b55a MC |
1414 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
1415 | (u8*)tcp_ctask->hdrext); | |
3219e529 MC |
1416 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0); |
1417 | if (!rc) { | |
5bb0b55a | 1418 | BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE); |
7ba24713 AA |
1419 | return 0; /* wait for Data-In */ |
1420 | } | |
5bb0b55a | 1421 | tcp_ctask->xmstate |= XMSTATE_R_HDR; |
3219e529 | 1422 | return rc; |
7ba24713 AA |
1423 | } |
1424 | ||
1425 | static inline int | |
5bb0b55a MC |
1426 | handle_xmstate_w_hdr(struct iscsi_conn *conn, |
1427 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1428 | { |
5bb0b55a | 1429 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1430 | int rc; |
5bb0b55a MC |
1431 | |
1432 | tcp_ctask->xmstate &= ~XMSTATE_W_HDR; | |
42f72aa9 | 1433 | if (conn->hdrdgst_en) |
5bb0b55a MC |
1434 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
1435 | (u8*)tcp_ctask->hdrext); | |
3219e529 MC |
1436 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count); |
1437 | if (rc) | |
5bb0b55a | 1438 | tcp_ctask->xmstate |= XMSTATE_W_HDR; |
3219e529 | 1439 | return rc; |
7ba24713 AA |
1440 | } |
1441 | ||
1442 | static inline int | |
1443 | handle_xmstate_data_digest(struct iscsi_conn *conn, | |
1444 | struct iscsi_cmd_task *ctask) | |
1445 | { | |
5bb0b55a | 1446 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1447 | int rc; |
5bb0b55a MC |
1448 | |
1449 | tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST; | |
1450 | debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest); | |
3219e529 MC |
1451 | rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, |
1452 | &tcp_ctask->datadigest, 0); | |
1453 | if (rc) { | |
5bb0b55a | 1454 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; |
7ba24713 | 1455 | debug_tcp("resent data digest 0x%x fail!\n", |
5bb0b55a | 1456 | tcp_ctask->datadigest); |
7ba24713 | 1457 | } |
3219e529 MC |
1458 | |
1459 | return rc; | |
7ba24713 AA |
1460 | } |
1461 | ||
1462 | static inline int | |
1463 | handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1464 | { | |
5bb0b55a MC |
1465 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1466 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
3219e529 | 1467 | int rc; |
5bb0b55a | 1468 | |
7ba24713 | 1469 | BUG_ON(!ctask->imm_count); |
5bb0b55a | 1470 | tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1471 | |
1472 | if (conn->datadgst_en) { | |
5bb0b55a MC |
1473 | iscsi_data_digest_init(tcp_conn, ctask); |
1474 | tcp_ctask->immdigest = 0; | |
7ba24713 AA |
1475 | } |
1476 | ||
1477 | for (;;) { | |
3219e529 MC |
1478 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
1479 | &ctask->imm_count, &tcp_ctask->sent); | |
1480 | if (rc) { | |
5bb0b55a | 1481 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; |
7ba24713 | 1482 | if (conn->datadgst_en) { |
5bb0b55a MC |
1483 | crypto_digest_final(tcp_conn->data_tx_tfm, |
1484 | (u8*)&tcp_ctask->immdigest); | |
7ba24713 | 1485 | debug_tcp("tx imm sendpage fail 0x%x\n", |
5bb0b55a | 1486 | tcp_ctask->datadigest); |
7ba24713 | 1487 | } |
3219e529 | 1488 | return rc; |
7ba24713 AA |
1489 | } |
1490 | if (conn->datadgst_en) | |
5bb0b55a MC |
1491 | crypto_digest_update(tcp_conn->data_tx_tfm, |
1492 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1493 | |
1494 | if (!ctask->imm_count) | |
1495 | break; | |
5bb0b55a MC |
1496 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1497 | &tcp_ctask->sg[tcp_ctask->sg_count++]); | |
7ba24713 AA |
1498 | } |
1499 | ||
5bb0b55a | 1500 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
3219e529 MC |
1501 | rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, |
1502 | &tcp_ctask->immdigest, 1); | |
1503 | if (rc) { | |
7ba24713 | 1504 | debug_tcp("sending imm digest 0x%x fail!\n", |
5bb0b55a | 1505 | tcp_ctask->immdigest); |
3219e529 | 1506 | return rc; |
7ba24713 | 1507 | } |
5bb0b55a | 1508 | debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest); |
7ba24713 AA |
1509 | } |
1510 | ||
1511 | return 0; | |
1512 | } | |
1513 | ||
1514 | static inline int | |
1515 | handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1516 | { | |
5bb0b55a | 1517 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1518 | struct iscsi_data_task *dtask; |
3219e529 | 1519 | int rc; |
7ba24713 | 1520 | |
5bb0b55a MC |
1521 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
1522 | if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { | |
7ba24713 | 1523 | iscsi_unsolicit_data_init(conn, ctask); |
5bb0b55a | 1524 | dtask = tcp_ctask->dtask; |
af973481 | 1525 | if (conn->hdrdgst_en) |
5bb0b55a | 1526 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
af973481 | 1527 | (u8*)dtask->hdrext); |
5bb0b55a | 1528 | tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
7ba24713 | 1529 | } |
3219e529 MC |
1530 | |
1531 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count); | |
1532 | if (rc) { | |
5bb0b55a MC |
1533 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
1534 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR; | |
3219e529 | 1535 | return rc; |
7ba24713 AA |
1536 | } |
1537 | ||
1538 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", | |
5bb0b55a | 1539 | ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
7ba24713 AA |
1540 | return 0; |
1541 | } | |
1542 | ||
1543 | static inline int | |
1544 | handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1545 | { | |
5bb0b55a MC |
1546 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1547 | struct iscsi_data_task *dtask = tcp_ctask->dtask; | |
1548 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
3219e529 | 1549 | int rc; |
7ba24713 AA |
1550 | |
1551 | BUG_ON(!ctask->data_count); | |
5bb0b55a | 1552 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
7ba24713 AA |
1553 | |
1554 | if (conn->datadgst_en) { | |
5bb0b55a | 1555 | iscsi_data_digest_init(tcp_conn, ctask); |
7ba24713 AA |
1556 | dtask->digest = 0; |
1557 | } | |
1558 | ||
1559 | for (;;) { | |
5bb0b55a | 1560 | int start = tcp_ctask->sent; |
7ba24713 | 1561 | |
3219e529 MC |
1562 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
1563 | &ctask->data_count, &tcp_ctask->sent); | |
1564 | if (rc) { | |
5bb0b55a MC |
1565 | ctask->unsol_count -= tcp_ctask->sent - start; |
1566 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; | |
7ba24713 AA |
1567 | /* will continue with this ctask later.. */ |
1568 | if (conn->datadgst_en) { | |
5bb0b55a | 1569 | crypto_digest_final(tcp_conn->data_tx_tfm, |
7ba24713 AA |
1570 | (u8 *)&dtask->digest); |
1571 | debug_tcp("tx uns data fail 0x%x\n", | |
1572 | dtask->digest); | |
1573 | } | |
3219e529 | 1574 | return rc; |
7ba24713 AA |
1575 | } |
1576 | ||
5bb0b55a MC |
1577 | BUG_ON(tcp_ctask->sent > ctask->total_length); |
1578 | ctask->unsol_count -= tcp_ctask->sent - start; | |
7ba24713 AA |
1579 | |
1580 | /* | |
1581 | * XXX:we may run here with un-initial sendbuf. | |
1582 | * so pass it | |
1583 | */ | |
5bb0b55a MC |
1584 | if (conn->datadgst_en && tcp_ctask->sent - start > 0) |
1585 | crypto_digest_update(tcp_conn->data_tx_tfm, | |
1586 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1587 | |
1588 | if (!ctask->data_count) | |
1589 | break; | |
5bb0b55a MC |
1590 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1591 | &tcp_ctask->sg[tcp_ctask->sg_count++]); | |
7ba24713 AA |
1592 | } |
1593 | BUG_ON(ctask->unsol_count < 0); | |
1594 | ||
1595 | /* | |
1596 | * Done with the Data-Out. Next, check if we need | |
1597 | * to send another unsolicited Data-Out. | |
1598 | */ | |
1599 | if (ctask->unsol_count) { | |
1600 | if (conn->datadgst_en) { | |
3219e529 | 1601 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1602 | &dtask->digestbuf, |
3219e529 MC |
1603 | &dtask->digest, 1); |
1604 | if (rc) { | |
7ba24713 AA |
1605 | debug_tcp("send uns digest 0x%x fail\n", |
1606 | dtask->digest); | |
3219e529 | 1607 | return rc; |
7ba24713 AA |
1608 | } |
1609 | debug_tcp("sending uns digest 0x%x, more uns\n", | |
1610 | dtask->digest); | |
1611 | } | |
5bb0b55a | 1612 | tcp_ctask->xmstate |= XMSTATE_UNS_INIT; |
7ba24713 AA |
1613 | return 1; |
1614 | } | |
1615 | ||
5bb0b55a | 1616 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
3219e529 | 1617 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1618 | &dtask->digestbuf, |
3219e529 MC |
1619 | &dtask->digest, 1); |
1620 | if (rc) { | |
7ba24713 AA |
1621 | debug_tcp("send last uns digest 0x%x fail\n", |
1622 | dtask->digest); | |
3219e529 | 1623 | return rc; |
7ba24713 AA |
1624 | } |
1625 | debug_tcp("sending uns digest 0x%x\n",dtask->digest); | |
1626 | } | |
1627 | ||
1628 | return 0; | |
1629 | } | |
1630 | ||
1631 | static inline int | |
1632 | handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1633 | { | |
1634 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
1635 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1636 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1637 | struct iscsi_r2t_info *r2t = tcp_ctask->r2t; | |
ffbfe925 | 1638 | struct iscsi_data_task *dtask = &r2t->dtask; |
3219e529 | 1639 | int left, rc; |
7ba24713 | 1640 | |
5bb0b55a MC |
1641 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
1642 | tcp_ctask->dtask = dtask; | |
7ba24713 AA |
1643 | |
1644 | if (conn->datadgst_en) { | |
5bb0b55a | 1645 | iscsi_data_digest_init(tcp_conn, ctask); |
7ba24713 AA |
1646 | dtask->digest = 0; |
1647 | } | |
1648 | solicit_again: | |
1649 | /* | |
b6c395ed | 1650 | * send Data-Out within this R2T sequence. |
7ba24713 AA |
1651 | */ |
1652 | if (!r2t->data_count) | |
1653 | goto data_out_done; | |
1654 | ||
3219e529 MC |
1655 | rc = iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent); |
1656 | if (rc) { | |
5bb0b55a | 1657 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
7ba24713 AA |
1658 | /* will continue with this ctask later.. */ |
1659 | if (conn->datadgst_en) { | |
5bb0b55a | 1660 | crypto_digest_final(tcp_conn->data_tx_tfm, |
7ba24713 AA |
1661 | (u8 *)&dtask->digest); |
1662 | debug_tcp("r2t data send fail 0x%x\n", dtask->digest); | |
1663 | } | |
3219e529 | 1664 | return rc; |
7ba24713 AA |
1665 | } |
1666 | ||
1667 | BUG_ON(r2t->data_count < 0); | |
1668 | if (conn->datadgst_en) | |
5bb0b55a MC |
1669 | crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg, |
1670 | 1); | |
7ba24713 AA |
1671 | |
1672 | if (r2t->data_count) { | |
1673 | BUG_ON(ctask->sc->use_sg == 0); | |
1674 | if (!iscsi_buf_left(&r2t->sendbuf)) { | |
5bb0b55a | 1675 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
7ba24713 AA |
1676 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1677 | r2t->sg += 1; | |
1678 | } | |
1679 | goto solicit_again; | |
1680 | } | |
1681 | ||
1682 | data_out_done: | |
1683 | /* | |
1684 | * Done with this Data-Out. Next, check if we have | |
1685 | * to send another Data-Out for this R2T. | |
1686 | */ | |
1687 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1688 | left = r2t->data_length - r2t->sent; | |
1689 | if (left) { | |
1690 | if (conn->datadgst_en) { | |
3219e529 | 1691 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1692 | &dtask->digestbuf, |
3219e529 MC |
1693 | &dtask->digest, 1); |
1694 | if (rc) { | |
7ba24713 AA |
1695 | debug_tcp("send r2t data digest 0x%x" |
1696 | "fail\n", dtask->digest); | |
3219e529 | 1697 | return rc; |
7ba24713 AA |
1698 | } |
1699 | debug_tcp("r2t data send digest 0x%x\n", | |
1700 | dtask->digest); | |
1701 | } | |
1702 | iscsi_solicit_data_cont(conn, ctask, r2t, left); | |
5bb0b55a MC |
1703 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
1704 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
7ba24713 AA |
1705 | return 1; |
1706 | } | |
1707 | ||
1708 | /* | |
1709 | * Done with this R2T. Check if there are more | |
1710 | * outstanding R2Ts ready to be processed. | |
1711 | */ | |
5bb0b55a | 1712 | BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0); |
7ba24713 | 1713 | if (conn->datadgst_en) { |
3219e529 MC |
1714 | rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, |
1715 | &dtask->digest, 1); | |
1716 | if (rc) { | |
7ba24713 AA |
1717 | debug_tcp("send last r2t data digest 0x%x" |
1718 | "fail\n", dtask->digest); | |
3219e529 | 1719 | return rc; |
7ba24713 AA |
1720 | } |
1721 | debug_tcp("r2t done dout digest 0x%x\n", dtask->digest); | |
1722 | } | |
1723 | ||
5bb0b55a MC |
1724 | tcp_ctask->r2t_data_count -= r2t->data_length; |
1725 | tcp_ctask->r2t = NULL; | |
7ba24713 | 1726 | spin_lock_bh(&session->lock); |
5bb0b55a | 1727 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 | 1728 | spin_unlock_bh(&session->lock); |
5bb0b55a MC |
1729 | if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { |
1730 | tcp_ctask->r2t = r2t; | |
1731 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
1732 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
7ba24713 AA |
1733 | return 1; |
1734 | } | |
1735 | ||
1736 | return 0; | |
1737 | } | |
1738 | ||
1739 | static inline int | |
1740 | handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1741 | { | |
5bb0b55a MC |
1742 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1743 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1744 | struct iscsi_data_task *dtask = tcp_ctask->dtask; | |
b6c395ed | 1745 | int sent = 0, rc; |
7ba24713 | 1746 | |
5bb0b55a | 1747 | tcp_ctask->xmstate &= ~XMSTATE_W_PAD; |
6e458cc9 | 1748 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, |
5bb0b55a | 1749 | tcp_ctask->pad_count); |
3219e529 MC |
1750 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, |
1751 | &sent); | |
1752 | if (rc) { | |
5bb0b55a | 1753 | tcp_ctask->xmstate |= XMSTATE_W_PAD; |
3219e529 | 1754 | return rc; |
7ba24713 AA |
1755 | } |
1756 | ||
1757 | if (conn->datadgst_en) { | |
5bb0b55a MC |
1758 | crypto_digest_update(tcp_conn->data_tx_tfm, |
1759 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1760 | /* imm data? */ |
1761 | if (!dtask) { | |
3219e529 | 1762 | rc = iscsi_digest_final_send(conn, ctask, |
5bb0b55a | 1763 | &tcp_ctask->immbuf, |
3219e529 MC |
1764 | &tcp_ctask->immdigest, 1); |
1765 | if (rc) { | |
7ba24713 | 1766 | debug_tcp("send padding digest 0x%x" |
5bb0b55a | 1767 | "fail!\n", tcp_ctask->immdigest); |
3219e529 | 1768 | return rc; |
7ba24713 AA |
1769 | } |
1770 | debug_tcp("done with padding, digest 0x%x\n", | |
5bb0b55a | 1771 | tcp_ctask->datadigest); |
7ba24713 | 1772 | } else { |
3219e529 | 1773 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1774 | &dtask->digestbuf, |
3219e529 MC |
1775 | &dtask->digest, 1); |
1776 | if (rc) { | |
7ba24713 AA |
1777 | debug_tcp("send padding digest 0x%x" |
1778 | "fail\n", dtask->digest); | |
3219e529 | 1779 | return rc; |
7ba24713 AA |
1780 | } |
1781 | debug_tcp("done with padding, digest 0x%x\n", | |
1782 | dtask->digest); | |
1783 | } | |
1784 | } | |
1785 | ||
1786 | return 0; | |
1787 | } | |
1788 | ||
1789 | static int | |
5bb0b55a | 1790 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 1791 | { |
5bb0b55a | 1792 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1793 | int rc = 0; |
1794 | ||
1795 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", | |
5bb0b55a | 1796 | conn->id, tcp_ctask->xmstate, ctask->itt); |
7ba24713 AA |
1797 | |
1798 | /* | |
1799 | * serialize with TMF AbortTask | |
1800 | */ | |
1801 | if (ctask->mtask) | |
1802 | return rc; | |
1803 | ||
3219e529 MC |
1804 | if (tcp_ctask->xmstate & XMSTATE_R_HDR) |
1805 | return handle_xmstate_r_hdr(conn, tcp_ctask); | |
7ba24713 | 1806 | |
5bb0b55a | 1807 | if (tcp_ctask->xmstate & XMSTATE_W_HDR) { |
7ba24713 AA |
1808 | rc = handle_xmstate_w_hdr(conn, ctask); |
1809 | if (rc) | |
1810 | return rc; | |
1811 | } | |
1812 | ||
1813 | /* XXX: for data digest xmit recover */ | |
5bb0b55a | 1814 | if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) { |
7ba24713 AA |
1815 | rc = handle_xmstate_data_digest(conn, ctask); |
1816 | if (rc) | |
1817 | return rc; | |
1818 | } | |
1819 | ||
5bb0b55a | 1820 | if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 AA |
1821 | rc = handle_xmstate_imm_data(conn, ctask); |
1822 | if (rc) | |
1823 | return rc; | |
1824 | } | |
1825 | ||
5bb0b55a | 1826 | if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
7ba24713 | 1827 | BUG_ON(!ctask->unsol_count); |
5bb0b55a | 1828 | tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; |
7ba24713 AA |
1829 | unsolicit_head_again: |
1830 | rc = handle_xmstate_uns_hdr(conn, ctask); | |
1831 | if (rc) | |
1832 | return rc; | |
1833 | } | |
1834 | ||
5bb0b55a | 1835 | if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
7ba24713 AA |
1836 | rc = handle_xmstate_uns_data(conn, ctask); |
1837 | if (rc == 1) | |
1838 | goto unsolicit_head_again; | |
1839 | else if (rc) | |
1840 | return rc; | |
1841 | goto done; | |
1842 | } | |
1843 | ||
5bb0b55a | 1844 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { |
7ba24713 AA |
1845 | struct iscsi_r2t_info *r2t; |
1846 | ||
5bb0b55a MC |
1847 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
1848 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
1849 | if (!tcp_ctask->r2t) | |
1850 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, | |
7ba24713 AA |
1851 | sizeof(void*)); |
1852 | solicit_head_again: | |
5bb0b55a | 1853 | r2t = tcp_ctask->r2t; |
af973481 | 1854 | if (conn->hdrdgst_en) |
42f72aa9 | 1855 | iscsi_hdr_digest(conn, &r2t->headbuf, |
ffbfe925 | 1856 | (u8*)r2t->dtask.hdrext); |
3219e529 MC |
1857 | rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count); |
1858 | if (rc) { | |
5bb0b55a MC |
1859 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
1860 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
3219e529 | 1861 | return rc; |
7ba24713 AA |
1862 | } |
1863 | ||
1864 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", | |
1865 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, | |
1866 | r2t->sent); | |
1867 | } | |
1868 | ||
5bb0b55a | 1869 | if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
7ba24713 AA |
1870 | rc = handle_xmstate_sol_data(conn, ctask); |
1871 | if (rc == 1) | |
1872 | goto solicit_head_again; | |
1873 | if (rc) | |
1874 | return rc; | |
1875 | } | |
1876 | ||
1877 | done: | |
1878 | /* | |
1879 | * Last thing to check is whether we need to send write | |
1880 | * padding. Note that we check for xmstate equality, not just the bit. | |
1881 | */ | |
5bb0b55a | 1882 | if (tcp_ctask->xmstate == XMSTATE_W_PAD) |
7ba24713 AA |
1883 | rc = handle_xmstate_w_pad(conn, ctask); |
1884 | ||
1885 | return rc; | |
1886 | } | |
1887 | ||
5bb0b55a MC |
1888 | static struct iscsi_cls_conn * |
1889 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1890 | { |
5bb0b55a MC |
1891 | struct iscsi_conn *conn; |
1892 | struct iscsi_cls_conn *cls_conn; | |
1893 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1894 | |
5bb0b55a MC |
1895 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
1896 | if (!cls_conn) | |
1897 | return NULL; | |
1898 | conn = cls_conn->dd_data; | |
7ba24713 | 1899 | /* |
5bb0b55a MC |
1900 | * due to strange issues with iser these are not set |
1901 | * in iscsi_conn_setup | |
7ba24713 | 1902 | */ |
5bb0b55a | 1903 | conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; |
7ba24713 | 1904 | |
5bb0b55a MC |
1905 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
1906 | if (!tcp_conn) | |
1907 | goto tcp_conn_alloc_fail; | |
7ba24713 | 1908 | |
5bb0b55a MC |
1909 | conn->dd_data = tcp_conn; |
1910 | tcp_conn->iscsi_conn = conn; | |
1911 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
1912 | /* initial operational parameters */ | |
1913 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); | |
1914 | tcp_conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; | |
7ba24713 | 1915 | |
5bb0b55a MC |
1916 | /* allocate initial PDU receive place holder */ |
1917 | if (tcp_conn->data_size <= PAGE_SIZE) | |
1918 | tcp_conn->data = kmalloc(tcp_conn->data_size, GFP_KERNEL); | |
1919 | else | |
1920 | tcp_conn->data = (void*)__get_free_pages(GFP_KERNEL, | |
1921 | get_order(tcp_conn->data_size)); | |
1922 | if (!tcp_conn->data) | |
1923 | goto max_recv_dlenght_alloc_fail; | |
7ba24713 | 1924 | |
5bb0b55a | 1925 | return cls_conn; |
7ba24713 | 1926 | |
5bb0b55a MC |
1927 | max_recv_dlenght_alloc_fail: |
1928 | kfree(tcp_conn); | |
1929 | tcp_conn_alloc_fail: | |
1930 | iscsi_conn_teardown(cls_conn); | |
1931 | return NULL; | |
7ba24713 AA |
1932 | } |
1933 | ||
1c83469d MC |
1934 | static void |
1935 | iscsi_tcp_release_conn(struct iscsi_conn *conn) | |
1936 | { | |
1937 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1938 | ||
1939 | if (!tcp_conn->sock) | |
1940 | return; | |
1941 | ||
1942 | sock_hold(tcp_conn->sock->sk); | |
1943 | iscsi_conn_restore_callbacks(tcp_conn); | |
1944 | sock_put(tcp_conn->sock->sk); | |
1945 | ||
1946 | sock_release(tcp_conn->sock); | |
1947 | tcp_conn->sock = NULL; | |
1948 | conn->recv_lock = NULL; | |
1949 | } | |
1950 | ||
7ba24713 | 1951 | static void |
5bb0b55a | 1952 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1953 | { |
5bb0b55a MC |
1954 | struct iscsi_conn *conn = cls_conn->dd_data; |
1955 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1956 | int digest = 0; | |
7ba24713 | 1957 | |
5bb0b55a MC |
1958 | if (conn->hdrdgst_en || conn->datadgst_en) |
1959 | digest = 1; | |
7ba24713 | 1960 | |
1c83469d | 1961 | iscsi_tcp_release_conn(conn); |
5bb0b55a | 1962 | iscsi_conn_teardown(cls_conn); |
7ba24713 | 1963 | |
5bb0b55a MC |
1964 | /* now free tcp_conn */ |
1965 | if (digest) { | |
1966 | if (tcp_conn->tx_tfm) | |
1967 | crypto_free_tfm(tcp_conn->tx_tfm); | |
1968 | if (tcp_conn->rx_tfm) | |
1969 | crypto_free_tfm(tcp_conn->rx_tfm); | |
1970 | if (tcp_conn->data_tx_tfm) | |
1971 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
1972 | if (tcp_conn->data_rx_tfm) | |
1973 | crypto_free_tfm(tcp_conn->data_rx_tfm); | |
1974 | } | |
7ba24713 | 1975 | |
5bb0b55a MC |
1976 | /* free conn->data, size = MaxRecvDataSegmentLength */ |
1977 | if (tcp_conn->data_size <= PAGE_SIZE) | |
1978 | kfree(tcp_conn->data); | |
1979 | else | |
1980 | free_pages((unsigned long)tcp_conn->data, | |
1981 | get_order(tcp_conn->data_size)); | |
1982 | kfree(tcp_conn); | |
1983 | } | |
7ba24713 | 1984 | |
1c83469d MC |
1985 | static void |
1986 | iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1987 | { | |
1988 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1989 | ||
1990 | iscsi_conn_stop(cls_conn, flag); | |
1991 | iscsi_tcp_release_conn(conn); | |
1992 | } | |
1993 | ||
5bb0b55a MC |
1994 | static int |
1995 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1996 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1997 | int is_leading) |
1998 | { | |
1999 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2000 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
2001 | struct sock *sk; | |
2002 | struct socket *sock; | |
2003 | int err; | |
7ba24713 | 2004 | |
5bb0b55a | 2005 | /* lookup for existing socket */ |
264faaaa | 2006 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a MC |
2007 | if (!sock) { |
2008 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); | |
2009 | return -EEXIST; | |
7ba24713 AA |
2010 | } |
2011 | ||
5bb0b55a MC |
2012 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
2013 | if (err) | |
2014 | return err; | |
7ba24713 | 2015 | |
67a61114 MC |
2016 | /* bind iSCSI connection and socket */ |
2017 | tcp_conn->sock = sock; | |
7ba24713 | 2018 | |
67a61114 MC |
2019 | /* setup Socket parameters */ |
2020 | sk = sock->sk; | |
2021 | sk->sk_reuse = 1; | |
2022 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
2023 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 2024 | |
67a61114 | 2025 | /* FIXME: disable Nagle's algorithm */ |
7ba24713 | 2026 | |
67a61114 MC |
2027 | /* |
2028 | * Intercept TCP callbacks for sendfile like receive | |
2029 | * processing. | |
2030 | */ | |
2031 | conn->recv_lock = &sk->sk_callback_lock; | |
2032 | iscsi_conn_set_callbacks(conn); | |
2033 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; | |
2034 | /* | |
2035 | * set receive state machine into initial state | |
2036 | */ | |
2037 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 | 2038 | |
7ba24713 AA |
2039 | return 0; |
2040 | } | |
2041 | ||
5bb0b55a | 2042 | /* called with host lock */ |
30a6c652 | 2043 | static void |
5bb0b55a MC |
2044 | iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask, |
2045 | char *data, uint32_t data_size) | |
7ba24713 | 2046 | { |
5bb0b55a | 2047 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
7ba24713 | 2048 | |
6e458cc9 MC |
2049 | iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr, |
2050 | sizeof(struct iscsi_hdr)); | |
5bb0b55a | 2051 | tcp_mtask->xmstate = XMSTATE_IMM_HDR; |
b6c395ed | 2052 | tcp_mtask->sent = 0; |
7ba24713 | 2053 | |
5bb0b55a MC |
2054 | if (mtask->data_count) |
2055 | iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data, | |
7ba24713 | 2056 | mtask->data_count); |
7ba24713 AA |
2057 | } |
2058 | ||
2059 | static int | |
2060 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
2061 | { | |
2062 | int i; | |
2063 | int cmd_i; | |
2064 | ||
2065 | /* | |
2066 | * initialize per-task: R2T pool and xmit queue | |
2067 | */ | |
2068 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2069 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
5bb0b55a | 2070 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
2071 | |
2072 | /* | |
2073 | * pre-allocated x4 as much r2ts to handle race when | |
2074 | * target acks DataOut faster than we data_xmit() queues | |
2075 | * could replenish r2tqueue. | |
2076 | */ | |
2077 | ||
2078 | /* R2T pool */ | |
5bb0b55a MC |
2079 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
2080 | (void***)&tcp_ctask->r2ts, | |
2081 | sizeof(struct iscsi_r2t_info))) { | |
7ba24713 AA |
2082 | goto r2t_alloc_fail; |
2083 | } | |
2084 | ||
2085 | /* R2T xmit queue */ | |
5bb0b55a | 2086 | tcp_ctask->r2tqueue = kfifo_alloc( |
7ba24713 | 2087 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
5bb0b55a MC |
2088 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
2089 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2090 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2091 | goto r2t_alloc_fail; |
2092 | } | |
7ba24713 AA |
2093 | } |
2094 | ||
2095 | return 0; | |
2096 | ||
2097 | r2t_alloc_fail: | |
2098 | for (i = 0; i < cmd_i; i++) { | |
5bb0b55a MC |
2099 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2100 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2101 | ||
5bb0b55a MC |
2102 | kfifo_free(tcp_ctask->r2tqueue); |
2103 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2104 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2105 | } |
2106 | return -ENOMEM; | |
2107 | } | |
2108 | ||
2109 | static void | |
2110 | iscsi_r2tpool_free(struct iscsi_session *session) | |
2111 | { | |
2112 | int i; | |
2113 | ||
2114 | for (i = 0; i < session->cmds_max; i++) { | |
5bb0b55a MC |
2115 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2116 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 2117 | |
5bb0b55a MC |
2118 | kfifo_free(tcp_ctask->r2tqueue); |
2119 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2120 | (void**)tcp_ctask->r2ts); | |
7ba24713 | 2121 | } |
7ba24713 AA |
2122 | } |
2123 | ||
2124 | static int | |
7b7232f3 | 2125 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
5c75b7fc | 2126 | char *buf, int buflen) |
7ba24713 | 2127 | { |
7b7232f3 | 2128 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 2129 | struct iscsi_session *session = conn->session; |
5bb0b55a | 2130 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5c75b7fc | 2131 | int value; |
7ba24713 | 2132 | |
7ba24713 AA |
2133 | switch(param) { |
2134 | case ISCSI_PARAM_MAX_RECV_DLENGTH: { | |
5bb0b55a | 2135 | char *saveptr = tcp_conn->data; |
b53cb2a4 | 2136 | gfp_t flags = GFP_KERNEL; |
7ba24713 | 2137 | |
5c75b7fc | 2138 | sscanf(buf, "%d", &value); |
5bb0b55a | 2139 | if (tcp_conn->data_size >= value) { |
5c75b7fc | 2140 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2141 | break; |
2142 | } | |
2143 | ||
2144 | spin_lock_bh(&session->lock); | |
2145 | if (conn->stop_stage == STOP_CONN_RECOVER) | |
2146 | flags = GFP_ATOMIC; | |
2147 | spin_unlock_bh(&session->lock); | |
2148 | ||
2149 | if (value <= PAGE_SIZE) | |
5bb0b55a | 2150 | tcp_conn->data = kmalloc(value, flags); |
7ba24713 | 2151 | else |
5bb0b55a | 2152 | tcp_conn->data = (void*)__get_free_pages(flags, |
7ba24713 | 2153 | get_order(value)); |
5bb0b55a MC |
2154 | if (tcp_conn->data == NULL) { |
2155 | tcp_conn->data = saveptr; | |
7ba24713 AA |
2156 | return -ENOMEM; |
2157 | } | |
5bb0b55a | 2158 | if (tcp_conn->data_size <= PAGE_SIZE) |
7ba24713 AA |
2159 | kfree(saveptr); |
2160 | else | |
2161 | free_pages((unsigned long)saveptr, | |
5bb0b55a | 2162 | get_order(tcp_conn->data_size)); |
5c75b7fc | 2163 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a | 2164 | tcp_conn->data_size = value; |
7ba24713 | 2165 | break; |
5c75b7fc | 2166 | } |
7ba24713 | 2167 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 2168 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a | 2169 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
7ba24713 | 2170 | if (conn->hdrdgst_en) { |
5bb0b55a MC |
2171 | tcp_conn->hdr_size += sizeof(__u32); |
2172 | if (!tcp_conn->tx_tfm) | |
2173 | tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c", | |
2174 | 0); | |
2175 | if (!tcp_conn->tx_tfm) | |
7ba24713 | 2176 | return -ENOMEM; |
5bb0b55a MC |
2177 | if (!tcp_conn->rx_tfm) |
2178 | tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c", | |
2179 | 0); | |
2180 | if (!tcp_conn->rx_tfm) { | |
2181 | crypto_free_tfm(tcp_conn->tx_tfm); | |
7ba24713 AA |
2182 | return -ENOMEM; |
2183 | } | |
2184 | } else { | |
5bb0b55a MC |
2185 | if (tcp_conn->tx_tfm) |
2186 | crypto_free_tfm(tcp_conn->tx_tfm); | |
2187 | if (tcp_conn->rx_tfm) | |
2188 | crypto_free_tfm(tcp_conn->rx_tfm); | |
7ba24713 AA |
2189 | } |
2190 | break; | |
2191 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 2192 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 | 2193 | if (conn->datadgst_en) { |
5bb0b55a MC |
2194 | if (!tcp_conn->data_tx_tfm) |
2195 | tcp_conn->data_tx_tfm = | |
7ba24713 | 2196 | crypto_alloc_tfm("crc32c", 0); |
5bb0b55a | 2197 | if (!tcp_conn->data_tx_tfm) |
7ba24713 | 2198 | return -ENOMEM; |
5bb0b55a MC |
2199 | if (!tcp_conn->data_rx_tfm) |
2200 | tcp_conn->data_rx_tfm = | |
7ba24713 | 2201 | crypto_alloc_tfm("crc32c", 0); |
5bb0b55a MC |
2202 | if (!tcp_conn->data_rx_tfm) { |
2203 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
7ba24713 AA |
2204 | return -ENOMEM; |
2205 | } | |
2206 | } else { | |
5bb0b55a MC |
2207 | if (tcp_conn->data_tx_tfm) |
2208 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
2209 | if (tcp_conn->data_rx_tfm) | |
2210 | crypto_free_tfm(tcp_conn->data_rx_tfm); | |
7ba24713 | 2211 | } |
5bb0b55a MC |
2212 | tcp_conn->sendpage = conn->datadgst_en ? |
2213 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 | 2214 | break; |
7ba24713 | 2215 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 2216 | sscanf(buf, "%d", &value); |
7ba24713 AA |
2217 | if (session->max_r2t == roundup_pow_of_two(value)) |
2218 | break; | |
2219 | iscsi_r2tpool_free(session); | |
5c75b7fc | 2220 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2221 | if (session->max_r2t & (session->max_r2t - 1)) |
2222 | session->max_r2t = roundup_pow_of_two(session->max_r2t); | |
2223 | if (iscsi_r2tpool_alloc(session)) | |
2224 | return -ENOMEM; | |
2225 | break; | |
7ba24713 | 2226 | default: |
5c75b7fc | 2227 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2228 | } |
2229 | ||
2230 | return 0; | |
2231 | } | |
2232 | ||
2233 | static int | |
5c75b7fc MC |
2234 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
2235 | enum iscsi_param param, char *buf) | |
7b8631b5 | 2236 | { |
7b7232f3 | 2237 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2238 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
fd7255f5 | 2239 | struct inet_sock *inet; |
5c75b7fc MC |
2240 | struct ipv6_pinfo *np; |
2241 | struct sock *sk; | |
2242 | int len; | |
7b8631b5 MC |
2243 | |
2244 | switch(param) { | |
fd7255f5 MC |
2245 | case ISCSI_PARAM_CONN_PORT: |
2246 | mutex_lock(&conn->xmitmutex); | |
5bb0b55a | 2247 | if (!tcp_conn->sock) { |
fd7255f5 MC |
2248 | mutex_unlock(&conn->xmitmutex); |
2249 | return -EINVAL; | |
2250 | } | |
2251 | ||
5bb0b55a | 2252 | inet = inet_sk(tcp_conn->sock->sk); |
5c75b7fc | 2253 | len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport)); |
fd7255f5 | 2254 | mutex_unlock(&conn->xmitmutex); |
8d2860b3 | 2255 | break; |
fd7255f5 MC |
2256 | case ISCSI_PARAM_CONN_ADDRESS: |
2257 | mutex_lock(&conn->xmitmutex); | |
5bb0b55a | 2258 | if (!tcp_conn->sock) { |
fd7255f5 MC |
2259 | mutex_unlock(&conn->xmitmutex); |
2260 | return -EINVAL; | |
2261 | } | |
2262 | ||
5bb0b55a | 2263 | sk = tcp_conn->sock->sk; |
fd7255f5 MC |
2264 | if (sk->sk_family == PF_INET) { |
2265 | inet = inet_sk(sk); | |
2266 | len = sprintf(buf, "%u.%u.%u.%u\n", | |
2267 | NIPQUAD(inet->daddr)); | |
2268 | } else { | |
2269 | np = inet6_sk(sk); | |
2270 | len = sprintf(buf, | |
2271 | "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
2272 | NIP6(np->daddr)); | |
2273 | } | |
2274 | mutex_unlock(&conn->xmitmutex); | |
2275 | break; | |
2276 | default: | |
5c75b7fc | 2277 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
2278 | } |
2279 | ||
2280 | return len; | |
2281 | } | |
2282 | ||
7ba24713 | 2283 | static void |
7b7232f3 | 2284 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 2285 | { |
7b7232f3 | 2286 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2287 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
2288 | |
2289 | stats->txdata_octets = conn->txdata_octets; | |
2290 | stats->rxdata_octets = conn->rxdata_octets; | |
2291 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
2292 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
2293 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
2294 | stats->datain_pdus = conn->datain_pdus_cnt; | |
2295 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
2296 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
2297 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
2298 | stats->custom_length = 3; | |
2299 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 2300 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 2301 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 2302 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
2303 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
2304 | stats->custom[2].value = conn->eh_abort_cnt; | |
2305 | } | |
2306 | ||
5bb0b55a MC |
2307 | static struct iscsi_cls_session * |
2308 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, | |
2309 | struct scsi_transport_template *scsit, | |
2310 | uint32_t initial_cmdsn, uint32_t *hostno) | |
7ba24713 | 2311 | { |
5bb0b55a MC |
2312 | struct iscsi_cls_session *cls_session; |
2313 | struct iscsi_session *session; | |
2314 | uint32_t hn; | |
2315 | int cmd_i; | |
7ba24713 | 2316 | |
5bb0b55a MC |
2317 | cls_session = iscsi_session_setup(iscsit, scsit, |
2318 | sizeof(struct iscsi_tcp_cmd_task), | |
2319 | sizeof(struct iscsi_tcp_mgmt_task), | |
2320 | initial_cmdsn, &hn); | |
2321 | if (!cls_session) | |
2322 | return NULL; | |
2323 | *hostno = hn; | |
7ba24713 | 2324 | |
5bb0b55a MC |
2325 | session = class_to_transport_session(cls_session); |
2326 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2327 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
2328 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2329 | ||
2330 | ctask->hdr = &tcp_ctask->hdr; | |
2331 | } | |
2332 | ||
2333 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
2334 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
2335 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
2336 | ||
2337 | mtask->hdr = &tcp_mtask->hdr; | |
2338 | } | |
2339 | ||
2340 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) | |
2341 | goto r2tpool_alloc_fail; | |
2342 | ||
2343 | return cls_session; | |
2344 | ||
2345 | r2tpool_alloc_fail: | |
2346 | iscsi_session_teardown(cls_session); | |
2347 | return NULL; | |
2348 | } | |
2349 | ||
2350 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
2351 | { | |
5bb0b55a MC |
2352 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
2353 | iscsi_session_teardown(cls_session); | |
7ba24713 AA |
2354 | } |
2355 | ||
5bb0b55a | 2356 | static struct scsi_host_template iscsi_sht = { |
e0ecae8d MC |
2357 | .name = "iSCSI Initiator over TCP/IP, v" |
2358 | ISCSI_TCP_VERSION, | |
5bb0b55a MC |
2359 | .queuecommand = iscsi_queuecommand, |
2360 | .change_queue_depth = iscsi_change_queue_depth, | |
2361 | .can_queue = ISCSI_XMIT_CMDS_MAX - 1, | |
2362 | .sg_tablesize = ISCSI_SG_TABLESIZE, | |
2363 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, | |
2364 | .eh_abort_handler = iscsi_eh_abort, | |
2365 | .eh_host_reset_handler = iscsi_eh_host_reset, | |
2366 | .use_clustering = DISABLE_CLUSTERING, | |
2367 | .proc_name = "iscsi_tcp", | |
2368 | .this_id = -1, | |
2369 | }; | |
2370 | ||
7ba24713 AA |
2371 | static struct iscsi_transport iscsi_tcp_transport = { |
2372 | .owner = THIS_MODULE, | |
2373 | .name = "tcp", | |
2374 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
2375 | | CAP_DATADGST, | |
fd7255f5 MC |
2376 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
2377 | ISCSI_MAX_XMIT_DLENGTH | | |
2378 | ISCSI_HDRDGST_EN | | |
2379 | ISCSI_DATADGST_EN | | |
2380 | ISCSI_INITIAL_R2T_EN | | |
2381 | ISCSI_MAX_R2T | | |
2382 | ISCSI_IMM_DATA_EN | | |
2383 | ISCSI_FIRST_BURST | | |
2384 | ISCSI_MAX_BURST | | |
2385 | ISCSI_PDU_INORDER_EN | | |
2386 | ISCSI_DATASEQ_INORDER_EN | | |
2387 | ISCSI_ERL | | |
2388 | ISCSI_CONN_PORT | | |
8d2860b3 | 2389 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
2390 | ISCSI_EXP_STATSN | |
2391 | ISCSI_PERSISTENT_PORT | | |
2392 | ISCSI_PERSISTENT_ADDRESS | | |
2393 | ISCSI_TARGET_NAME | | |
2394 | ISCSI_TPGT, | |
7ba24713 | 2395 | .host_template = &iscsi_sht, |
7b8631b5 | 2396 | .conndata_size = sizeof(struct iscsi_conn), |
7ba24713 AA |
2397 | .max_conn = 1, |
2398 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, | |
5bb0b55a MC |
2399 | /* session management */ |
2400 | .create_session = iscsi_tcp_session_create, | |
2401 | .destroy_session = iscsi_tcp_session_destroy, | |
2402 | /* connection management */ | |
2403 | .create_conn = iscsi_tcp_conn_create, | |
2404 | .bind_conn = iscsi_tcp_conn_bind, | |
2405 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 2406 | .set_param = iscsi_conn_set_param, |
5c75b7fc | 2407 | .get_conn_param = iscsi_tcp_conn_get_param, |
7b8631b5 | 2408 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 2409 | .start_conn = iscsi_conn_start, |
1c83469d | 2410 | .stop_conn = iscsi_tcp_conn_stop, |
5bb0b55a | 2411 | /* IO */ |
7ba24713 AA |
2412 | .send_pdu = iscsi_conn_send_pdu, |
2413 | .get_stats = iscsi_conn_get_stats, | |
5bb0b55a MC |
2414 | .init_cmd_task = iscsi_tcp_cmd_init, |
2415 | .init_mgmt_task = iscsi_tcp_mgmt_init, | |
2416 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, | |
2417 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2418 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2419 | /* recovery */ | |
30a6c652 | 2420 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
2421 | }; |
2422 | ||
2423 | static int __init | |
2424 | iscsi_tcp_init(void) | |
2425 | { | |
7ba24713 | 2426 | if (iscsi_max_lun < 1) { |
be2df72e OG |
2427 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
2428 | iscsi_max_lun); | |
7ba24713 AA |
2429 | return -EINVAL; |
2430 | } | |
2431 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
2432 | ||
7b8631b5 | 2433 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
ffbfe925 | 2434 | return -ENODEV; |
7ba24713 | 2435 | |
7b8631b5 | 2436 | return 0; |
7ba24713 AA |
2437 | } |
2438 | ||
2439 | static void __exit | |
2440 | iscsi_tcp_exit(void) | |
2441 | { | |
2442 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
7ba24713 AA |
2443 | } |
2444 | ||
2445 | module_init(iscsi_tcp_init); | |
2446 | module_exit(iscsi_tcp_exit); |