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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: | |
5bb0b55a MC |
514 | case ISCSI_OP_REJECT: |
515 | case ISCSI_OP_ASYNC_EVENT: | |
c8dc1e52 MC |
516 | /* |
517 | * It is possible that we could get a PDU with a buffer larger | |
518 | * than 8K, but there are no targets that currently do this. | |
519 | * For now we fail until we find a vendor that needs it | |
520 | */ | |
521 | if (DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH < | |
522 | tcp_conn->in.datalen) { | |
523 | printk(KERN_ERR "iscsi_tcp: received buffer of len %u " | |
524 | "but conn buffer is only %u (opcode %0x)\n", | |
525 | tcp_conn->in.datalen, | |
526 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, opcode); | |
527 | rc = ISCSI_ERR_PROTO; | |
528 | break; | |
529 | } | |
530 | ||
5bb0b55a MC |
531 | if (tcp_conn->in.datalen) |
532 | goto copy_hdr; | |
533 | /* fall through */ | |
c8dc1e52 MC |
534 | case ISCSI_OP_LOGOUT_RSP: |
535 | case ISCSI_OP_NOOP_IN: | |
5bb0b55a MC |
536 | case ISCSI_OP_SCSI_TMFUNC_RSP: |
537 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
538 | break; | |
539 | default: | |
540 | rc = ISCSI_ERR_BAD_OPCODE; | |
541 | break; | |
542 | } | |
7ba24713 AA |
543 | |
544 | return rc; | |
5bb0b55a MC |
545 | |
546 | copy_hdr: | |
547 | /* | |
548 | * if we did zero copy for the header but we will need multiple | |
549 | * skbs to complete the command then we have to copy the header | |
550 | * for later use | |
551 | */ | |
275fd7d1 | 552 | if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <= |
5bb0b55a MC |
553 | (tcp_conn->in.datalen + tcp_conn->in.padding + |
554 | (conn->datadgst_en ? 4 : 0))) { | |
555 | debug_tcp("Copying header for later use. in.copy %d in.datalen" | |
556 | " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); | |
557 | memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, | |
558 | sizeof(struct iscsi_hdr)); | |
559 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
560 | tcp_conn->in.zero_copy_hdr = 0; | |
561 | } | |
562 | return 0; | |
7ba24713 AA |
563 | } |
564 | ||
565 | /** | |
566 | * iscsi_ctask_copy - copy skb bits to the destanation cmd task | |
5bb0b55a | 567 | * @conn: iscsi tcp connection |
7ba24713 AA |
568 | * @ctask: scsi command task |
569 | * @buf: buffer to copy to | |
570 | * @buf_size: size of buffer | |
571 | * @offset: offset within the buffer | |
572 | * | |
573 | * Notes: | |
574 | * The function calls skb_copy_bits() and updates per-connection and | |
575 | * per-cmd byte counters. | |
576 | * | |
577 | * Read counters (in bytes): | |
578 | * | |
579 | * conn->in.offset offset within in progress SKB | |
580 | * conn->in.copy left to copy from in progress SKB | |
581 | * including padding | |
582 | * conn->in.copied copied already from in progress SKB | |
583 | * conn->data_copied copied already from in progress buffer | |
584 | * ctask->sent total bytes sent up to the MidLayer | |
585 | * ctask->data_count left to copy from in progress Data-In | |
586 | * buf_left left to copy from in progress buffer | |
587 | **/ | |
588 | static inline int | |
5bb0b55a | 589 | iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, |
7ba24713 AA |
590 | void *buf, int buf_size, int offset) |
591 | { | |
5bb0b55a MC |
592 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
593 | int buf_left = buf_size - (tcp_conn->data_copied + offset); | |
594 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
595 | int rc; |
596 | ||
597 | size = min(size, ctask->data_count); | |
598 | ||
599 | debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 600 | size, tcp_conn->in.offset, tcp_conn->in.copied); |
7ba24713 AA |
601 | |
602 | BUG_ON(size <= 0); | |
5bb0b55a | 603 | BUG_ON(tcp_ctask->sent + size > ctask->total_length); |
7ba24713 | 604 | |
5bb0b55a MC |
605 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
606 | (char*)buf + (offset + tcp_conn->data_copied), size); | |
7ba24713 AA |
607 | /* must fit into skb->len */ |
608 | BUG_ON(rc); | |
609 | ||
5bb0b55a MC |
610 | tcp_conn->in.offset += size; |
611 | tcp_conn->in.copy -= size; | |
612 | tcp_conn->in.copied += size; | |
613 | tcp_conn->data_copied += size; | |
614 | tcp_ctask->sent += size; | |
7ba24713 AA |
615 | ctask->data_count -= size; |
616 | ||
5bb0b55a | 617 | BUG_ON(tcp_conn->in.copy < 0); |
7ba24713 AA |
618 | BUG_ON(ctask->data_count < 0); |
619 | ||
5bb0b55a | 620 | if (buf_size != (tcp_conn->data_copied + offset)) { |
7ba24713 | 621 | if (!ctask->data_count) { |
5bb0b55a | 622 | BUG_ON(buf_size - tcp_conn->data_copied < 0); |
7ba24713 | 623 | /* done with this PDU */ |
5bb0b55a | 624 | return buf_size - tcp_conn->data_copied; |
7ba24713 AA |
625 | } |
626 | return -EAGAIN; | |
627 | } | |
628 | ||
629 | /* done with this buffer or with both - PDU and buffer */ | |
5bb0b55a | 630 | tcp_conn->data_copied = 0; |
7ba24713 AA |
631 | return 0; |
632 | } | |
633 | ||
634 | /** | |
635 | * iscsi_tcp_copy - copy skb bits to the destanation buffer | |
5bb0b55a | 636 | * @conn: iscsi tcp connection |
7ba24713 AA |
637 | * |
638 | * Notes: | |
639 | * The function calls skb_copy_bits() and updates per-connection | |
640 | * byte counters. | |
641 | **/ | |
642 | static inline int | |
c8dc1e52 | 643 | iscsi_tcp_copy(struct iscsi_conn *conn) |
7ba24713 | 644 | { |
c8dc1e52 | 645 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5bb0b55a MC |
646 | int buf_size = tcp_conn->in.datalen; |
647 | int buf_left = buf_size - tcp_conn->data_copied; | |
648 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
649 | int rc; |
650 | ||
651 | debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 652 | size, tcp_conn->in.offset, tcp_conn->data_copied); |
7ba24713 AA |
653 | BUG_ON(size <= 0); |
654 | ||
5bb0b55a | 655 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
c8dc1e52 | 656 | (char*)conn->data + tcp_conn->data_copied, size); |
7ba24713 AA |
657 | BUG_ON(rc); |
658 | ||
5bb0b55a MC |
659 | tcp_conn->in.offset += size; |
660 | tcp_conn->in.copy -= size; | |
661 | tcp_conn->in.copied += size; | |
662 | tcp_conn->data_copied += size; | |
7ba24713 | 663 | |
5bb0b55a | 664 | if (buf_size != tcp_conn->data_copied) |
7ba24713 AA |
665 | return -EAGAIN; |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
670 | static inline void | |
5bb0b55a MC |
671 | partial_sg_digest_update(struct iscsi_tcp_conn *tcp_conn, |
672 | struct scatterlist *sg, int offset, int length) | |
7ba24713 AA |
673 | { |
674 | struct scatterlist temp; | |
675 | ||
676 | memcpy(&temp, sg, sizeof(struct scatterlist)); | |
677 | temp.offset = offset; | |
678 | temp.length = length; | |
5bb0b55a | 679 | crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1); |
7ba24713 AA |
680 | } |
681 | ||
f6cfba1d | 682 | static void |
5bb0b55a | 683 | iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) |
f6cfba1d MC |
684 | { |
685 | struct scatterlist tmp; | |
686 | ||
687 | sg_init_one(&tmp, buf, len); | |
5bb0b55a | 688 | crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1); |
f6cfba1d MC |
689 | } |
690 | ||
7ba24713 AA |
691 | static int iscsi_scsi_data_in(struct iscsi_conn *conn) |
692 | { | |
5bb0b55a MC |
693 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
694 | struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; | |
695 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 696 | struct scsi_cmnd *sc = ctask->sc; |
f6cfba1d | 697 | struct scatterlist *sg; |
7ba24713 AA |
698 | int i, offset, rc = 0; |
699 | ||
700 | BUG_ON((void*)ctask != sc->SCp.ptr); | |
701 | ||
702 | /* | |
703 | * copying Data-In into the Scsi_Cmnd | |
704 | */ | |
705 | if (!sc->use_sg) { | |
706 | i = ctask->data_count; | |
5bb0b55a MC |
707 | rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, |
708 | sc->request_bufflen, | |
709 | tcp_ctask->data_offset); | |
7ba24713 AA |
710 | if (rc == -EAGAIN) |
711 | return rc; | |
42f72aa9 | 712 | if (conn->datadgst_en) |
5bb0b55a MC |
713 | iscsi_recv_digest_update(tcp_conn, sc->request_buffer, |
714 | i); | |
7ba24713 AA |
715 | rc = 0; |
716 | goto done; | |
717 | } | |
718 | ||
5bb0b55a | 719 | offset = tcp_ctask->data_offset; |
7ba24713 AA |
720 | sg = sc->request_buffer; |
721 | ||
5bb0b55a MC |
722 | if (tcp_ctask->data_offset) |
723 | for (i = 0; i < tcp_ctask->sg_count; i++) | |
7ba24713 AA |
724 | offset -= sg[i].length; |
725 | /* we've passed through partial sg*/ | |
726 | if (offset < 0) | |
727 | offset = 0; | |
728 | ||
5bb0b55a | 729 | for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { |
7ba24713 AA |
730 | char *dest; |
731 | ||
732 | dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); | |
5bb0b55a | 733 | rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, |
7ba24713 AA |
734 | sg[i].length, offset); |
735 | kunmap_atomic(dest, KM_SOFTIRQ0); | |
736 | if (rc == -EAGAIN) | |
737 | /* continue with the next SKB/PDU */ | |
738 | return rc; | |
739 | if (!rc) { | |
740 | if (conn->datadgst_en) { | |
741 | if (!offset) | |
5bb0b55a MC |
742 | crypto_digest_update( |
743 | tcp_conn->data_rx_tfm, | |
744 | &sg[i], 1); | |
7ba24713 | 745 | else |
5bb0b55a MC |
746 | partial_sg_digest_update(tcp_conn, |
747 | &sg[i], | |
7ba24713 AA |
748 | sg[i].offset + offset, |
749 | sg[i].length - offset); | |
750 | } | |
751 | offset = 0; | |
5bb0b55a | 752 | tcp_ctask->sg_count++; |
7ba24713 AA |
753 | } |
754 | ||
755 | if (!ctask->data_count) { | |
756 | if (rc && conn->datadgst_en) | |
757 | /* | |
758 | * data-in is complete, but buffer not... | |
759 | */ | |
5bb0b55a | 760 | partial_sg_digest_update(tcp_conn, &sg[i], |
7ba24713 AA |
761 | sg[i].offset, sg[i].length-rc); |
762 | rc = 0; | |
763 | break; | |
764 | } | |
765 | ||
5bb0b55a | 766 | if (!tcp_conn->in.copy) |
7ba24713 AA |
767 | return -EAGAIN; |
768 | } | |
769 | BUG_ON(ctask->data_count); | |
770 | ||
771 | done: | |
772 | /* check for non-exceptional status */ | |
5bb0b55a | 773 | if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { |
b6c395ed MC |
774 | debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n", |
775 | (long)sc, sc->result, ctask->itt, | |
776 | tcp_conn->in.hdr->flags); | |
5bb0b55a | 777 | spin_lock(&conn->session->lock); |
b6c395ed | 778 | iscsi_tcp_cleanup_ctask(conn, ctask); |
5bb0b55a MC |
779 | __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); |
780 | spin_unlock(&conn->session->lock); | |
7ba24713 AA |
781 | } |
782 | ||
783 | return rc; | |
784 | } | |
785 | ||
786 | static int | |
787 | iscsi_data_recv(struct iscsi_conn *conn) | |
788 | { | |
5bb0b55a MC |
789 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
790 | int rc = 0, opcode; | |
7ba24713 | 791 | |
5bb0b55a MC |
792 | opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
793 | switch (opcode) { | |
7ba24713 AA |
794 | case ISCSI_OP_SCSI_DATA_IN: |
795 | rc = iscsi_scsi_data_in(conn); | |
796 | break; | |
5bb0b55a MC |
797 | case ISCSI_OP_SCSI_CMD_RSP: |
798 | spin_lock(&conn->session->lock); | |
b6c395ed | 799 | iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask); |
5bb0b55a | 800 | spin_unlock(&conn->session->lock); |
7ba24713 AA |
801 | case ISCSI_OP_TEXT_RSP: |
802 | case ISCSI_OP_LOGIN_RSP: | |
5bb0b55a MC |
803 | case ISCSI_OP_ASYNC_EVENT: |
804 | case ISCSI_OP_REJECT: | |
7ba24713 AA |
805 | /* |
806 | * Collect data segment to the connection's data | |
807 | * placeholder | |
808 | */ | |
c8dc1e52 | 809 | if (iscsi_tcp_copy(conn)) { |
7ba24713 AA |
810 | rc = -EAGAIN; |
811 | goto exit; | |
812 | } | |
813 | ||
c8dc1e52 | 814 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data, |
5bb0b55a MC |
815 | tcp_conn->in.datalen); |
816 | if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) | |
c8dc1e52 | 817 | iscsi_recv_digest_update(tcp_conn, conn->data, |
5bb0b55a MC |
818 | tcp_conn->in.datalen); |
819 | break; | |
7ba24713 AA |
820 | default: |
821 | BUG_ON(1); | |
822 | } | |
823 | exit: | |
824 | return rc; | |
825 | } | |
826 | ||
827 | /** | |
828 | * iscsi_tcp_data_recv - TCP receive in sendfile fashion | |
829 | * @rd_desc: read descriptor | |
830 | * @skb: socket buffer | |
831 | * @offset: offset in skb | |
832 | * @len: skb->len - offset | |
833 | **/ | |
834 | static int | |
835 | iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
836 | unsigned int offset, size_t len) | |
837 | { | |
838 | int rc; | |
839 | struct iscsi_conn *conn = rd_desc->arg.data; | |
5bb0b55a | 840 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
841 | int processed; |
842 | char pad[ISCSI_PAD_LEN]; | |
843 | struct scatterlist sg; | |
844 | ||
845 | /* | |
846 | * Save current SKB and its offset in the corresponding | |
847 | * connection context. | |
848 | */ | |
5bb0b55a MC |
849 | tcp_conn->in.copy = skb->len - offset; |
850 | tcp_conn->in.offset = offset; | |
851 | tcp_conn->in.skb = skb; | |
852 | tcp_conn->in.len = tcp_conn->in.copy; | |
853 | BUG_ON(tcp_conn->in.copy <= 0); | |
854 | debug_tcp("in %d bytes\n", tcp_conn->in.copy); | |
7ba24713 AA |
855 | |
856 | more: | |
5bb0b55a | 857 | tcp_conn->in.copied = 0; |
7ba24713 AA |
858 | rc = 0; |
859 | ||
860 | if (unlikely(conn->suspend_rx)) { | |
861 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
862 | return 0; | |
863 | } | |
864 | ||
5bb0b55a MC |
865 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || |
866 | tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { | |
867 | rc = iscsi_hdr_extract(tcp_conn); | |
7ba24713 AA |
868 | if (rc) { |
869 | if (rc == -EAGAIN) | |
870 | goto nomore; | |
871 | else { | |
d82967c7 | 872 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
873 | return 0; |
874 | } | |
875 | } | |
876 | ||
877 | /* | |
878 | * Verify and process incoming PDU header. | |
879 | */ | |
5bb0b55a MC |
880 | rc = iscsi_tcp_hdr_recv(conn); |
881 | if (!rc && tcp_conn->in.datalen) { | |
8a47cd34 | 882 | if (conn->datadgst_en) { |
5bb0b55a MC |
883 | BUG_ON(!tcp_conn->data_rx_tfm); |
884 | crypto_digest_init(tcp_conn->data_rx_tfm); | |
7ba24713 | 885 | } |
5bb0b55a | 886 | tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; |
7ba24713 | 887 | } else if (rc) { |
d82967c7 | 888 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
889 | return 0; |
890 | } | |
891 | } | |
892 | ||
5bb0b55a | 893 | if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { |
f6cfba1d | 894 | uint32_t recv_digest; |
5bb0b55a | 895 | |
7ba24713 | 896 | debug_tcp("extra data_recv offset %d copy %d\n", |
5bb0b55a MC |
897 | tcp_conn->in.offset, tcp_conn->in.copy); |
898 | skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, | |
f6cfba1d | 899 | &recv_digest, 4); |
5bb0b55a MC |
900 | tcp_conn->in.offset += 4; |
901 | tcp_conn->in.copy -= 4; | |
902 | if (recv_digest != tcp_conn->in.datadgst) { | |
f6cfba1d MC |
903 | debug_tcp("iscsi_tcp: data digest error!" |
904 | "0x%x != 0x%x\n", recv_digest, | |
5bb0b55a | 905 | tcp_conn->in.datadgst); |
f6cfba1d MC |
906 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
907 | return 0; | |
908 | } else { | |
909 | debug_tcp("iscsi_tcp: data digest match!" | |
910 | "0x%x == 0x%x\n", recv_digest, | |
5bb0b55a MC |
911 | tcp_conn->in.datadgst); |
912 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
913 | } |
914 | } | |
915 | ||
5bb0b55a MC |
916 | if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && |
917 | tcp_conn->in.copy) { | |
7ba24713 AA |
918 | |
919 | debug_tcp("data_recv offset %d copy %d\n", | |
5bb0b55a | 920 | tcp_conn->in.offset, tcp_conn->in.copy); |
7ba24713 AA |
921 | |
922 | rc = iscsi_data_recv(conn); | |
923 | if (rc) { | |
665b44ae | 924 | if (rc == -EAGAIN) |
7ba24713 | 925 | goto again; |
d82967c7 | 926 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
927 | return 0; |
928 | } | |
5bb0b55a MC |
929 | tcp_conn->in.copy -= tcp_conn->in.padding; |
930 | tcp_conn->in.offset += tcp_conn->in.padding; | |
8a47cd34 | 931 | if (conn->datadgst_en) { |
5bb0b55a MC |
932 | if (tcp_conn->in.padding) { |
933 | debug_tcp("padding -> %d\n", | |
934 | tcp_conn->in.padding); | |
935 | memset(pad, 0, tcp_conn->in.padding); | |
936 | sg_init_one(&sg, pad, tcp_conn->in.padding); | |
937 | crypto_digest_update(tcp_conn->data_rx_tfm, | |
938 | &sg, 1); | |
7ba24713 | 939 | } |
5bb0b55a MC |
940 | crypto_digest_final(tcp_conn->data_rx_tfm, |
941 | (u8 *) & tcp_conn->in.datadgst); | |
942 | debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); | |
943 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; | |
7ba24713 | 944 | } else |
5bb0b55a | 945 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
7ba24713 AA |
946 | } |
947 | ||
948 | debug_tcp("f, processed %d from out of %d padding %d\n", | |
5bb0b55a MC |
949 | tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); |
950 | BUG_ON(tcp_conn->in.offset - offset > len); | |
7ba24713 | 951 | |
5bb0b55a | 952 | if (tcp_conn->in.offset - offset != len) { |
7ba24713 | 953 | debug_tcp("continue to process %d bytes\n", |
5bb0b55a | 954 | (int)len - (tcp_conn->in.offset - offset)); |
7ba24713 AA |
955 | goto more; |
956 | } | |
957 | ||
958 | nomore: | |
5bb0b55a | 959 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
960 | BUG_ON(processed == 0); |
961 | return processed; | |
962 | ||
963 | again: | |
5bb0b55a | 964 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
965 | debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", |
966 | processed, (int)len, (int)rd_desc->count); | |
967 | BUG_ON(processed == 0); | |
968 | BUG_ON(processed > len); | |
969 | ||
970 | conn->rxdata_octets += processed; | |
971 | return processed; | |
972 | } | |
973 | ||
974 | static void | |
975 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
976 | { | |
977 | struct iscsi_conn *conn = sk->sk_user_data; | |
978 | read_descriptor_t rd_desc; | |
979 | ||
980 | read_lock(&sk->sk_callback_lock); | |
981 | ||
665b44ae MC |
982 | /* |
983 | * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv. | |
984 | * We set count to 1 because we want the network layer to | |
985 | * hand us all the skbs that are available. iscsi_tcp_data_recv | |
986 | * handled pdus that cross buffers or pdus that still need data. | |
987 | */ | |
7ba24713 | 988 | rd_desc.arg.data = conn; |
665b44ae | 989 | rd_desc.count = 1; |
7ba24713 AA |
990 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); |
991 | ||
992 | read_unlock(&sk->sk_callback_lock); | |
993 | } | |
994 | ||
995 | static void | |
996 | iscsi_tcp_state_change(struct sock *sk) | |
997 | { | |
5bb0b55a | 998 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
999 | struct iscsi_conn *conn; |
1000 | struct iscsi_session *session; | |
1001 | void (*old_state_change)(struct sock *); | |
1002 | ||
1003 | read_lock(&sk->sk_callback_lock); | |
1004 | ||
1005 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
1006 | session = conn->session; | |
1007 | ||
e6273993 MC |
1008 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
1009 | sk->sk_state == TCP_CLOSE) && | |
1010 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
1011 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
1012 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1013 | } | |
1014 | ||
5bb0b55a MC |
1015 | tcp_conn = conn->dd_data; |
1016 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
1017 | |
1018 | read_unlock(&sk->sk_callback_lock); | |
1019 | ||
1020 | old_state_change(sk); | |
1021 | } | |
1022 | ||
1023 | /** | |
1024 | * iscsi_write_space - Called when more output buffer space is available | |
1025 | * @sk: socket space is available for | |
1026 | **/ | |
1027 | static void | |
1028 | iscsi_write_space(struct sock *sk) | |
1029 | { | |
1030 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1031 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1032 | ||
1033 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1034 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
55e3299d | 1035 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1036 | } |
1037 | ||
1038 | static void | |
1039 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1040 | { | |
5bb0b55a MC |
1041 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1042 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1043 | |
1044 | /* assign new callbacks */ | |
1045 | write_lock_bh(&sk->sk_callback_lock); | |
1046 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1047 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1048 | tcp_conn->old_state_change = sk->sk_state_change; | |
1049 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1050 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1051 | sk->sk_state_change = iscsi_tcp_state_change; | |
1052 | sk->sk_write_space = iscsi_write_space; | |
1053 | write_unlock_bh(&sk->sk_callback_lock); | |
1054 | } | |
1055 | ||
1056 | static void | |
1c83469d | 1057 | iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 1058 | { |
5bb0b55a | 1059 | struct sock *sk = tcp_conn->sock->sk; |
7ba24713 AA |
1060 | |
1061 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1062 | write_lock_bh(&sk->sk_callback_lock); | |
1063 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1064 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1065 | sk->sk_state_change = tcp_conn->old_state_change; | |
1066 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1067 | sk->sk_no_check = 0; |
1068 | write_unlock_bh(&sk->sk_callback_lock); | |
1069 | } | |
1070 | ||
1071 | /** | |
1072 | * iscsi_send - generic send routine | |
1073 | * @sk: kernel's socket | |
1074 | * @buf: buffer to write from | |
1075 | * @size: actual size to write | |
1076 | * @flags: socket's flags | |
7ba24713 AA |
1077 | */ |
1078 | static inline int | |
56851698 | 1079 | iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
7ba24713 | 1080 | { |
5bb0b55a MC |
1081 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1082 | struct socket *sk = tcp_conn->sock; | |
3219e529 | 1083 | int offset = buf->sg.offset + buf->sent, res; |
7ba24713 | 1084 | |
7cae5159 MC |
1085 | /* |
1086 | * if we got use_sg=0 or are sending something we kmallocd | |
1087 | * then we did not have to do kmap (kmap returns page_address) | |
1088 | * | |
1089 | * if we got use_sg > 0, but had to drop down, we do not | |
1090 | * set clustering so this should only happen for that | |
1091 | * slab case. | |
1092 | */ | |
1093 | if (buf->use_sendmsg) | |
3219e529 | 1094 | res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags); |
7cae5159 | 1095 | else |
3219e529 MC |
1096 | res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags); |
1097 | ||
1098 | if (res >= 0) { | |
1099 | conn->txdata_octets += res; | |
1100 | buf->sent += res; | |
1101 | return res; | |
1102 | } | |
1103 | ||
1104 | tcp_conn->sendpage_failures_cnt++; | |
1105 | if (res == -EAGAIN) | |
1106 | res = -ENOBUFS; | |
1107 | else | |
1108 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1109 | return res; | |
7ba24713 AA |
1110 | } |
1111 | ||
1112 | /** | |
1113 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() | |
1114 | * @conn: iscsi connection | |
1115 | * @buf: buffer to write from | |
1116 | * @datalen: lenght of data to be sent after the header | |
1117 | * | |
1118 | * Notes: | |
1119 | * (Tx, Fast Path) | |
1120 | **/ | |
1121 | static inline int | |
1122 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) | |
1123 | { | |
7ba24713 AA |
1124 | int flags = 0; /* MSG_DONTWAIT; */ |
1125 | int res, size; | |
1126 | ||
1127 | size = buf->sg.length - buf->sent; | |
1128 | BUG_ON(buf->sent + size > buf->sg.length); | |
1129 | if (buf->sent + size != buf->sg.length || datalen) | |
1130 | flags |= MSG_MORE; | |
1131 | ||
56851698 | 1132 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1133 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
1134 | if (res >= 0) { | |
7ba24713 AA |
1135 | if (size != res) |
1136 | return -EAGAIN; | |
1137 | return 0; | |
3219e529 | 1138 | } |
7ba24713 AA |
1139 | |
1140 | return res; | |
1141 | } | |
1142 | ||
1143 | /** | |
1144 | * iscsi_sendpage - send one page of iSCSI Data-Out. | |
1145 | * @conn: iscsi connection | |
1146 | * @buf: buffer to write from | |
1147 | * @count: remaining data | |
1148 | * @sent: number of bytes sent | |
1149 | * | |
1150 | * Notes: | |
1151 | * (Tx, Fast Path) | |
1152 | **/ | |
1153 | static inline int | |
1154 | iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, | |
1155 | int *count, int *sent) | |
1156 | { | |
7ba24713 AA |
1157 | int flags = 0; /* MSG_DONTWAIT; */ |
1158 | int res, size; | |
1159 | ||
1160 | size = buf->sg.length - buf->sent; | |
1161 | BUG_ON(buf->sent + size > buf->sg.length); | |
1162 | if (size > *count) | |
1163 | size = *count; | |
b13941f6 | 1164 | if (buf->sent + size != buf->sg.length || *count != size) |
7ba24713 AA |
1165 | flags |= MSG_MORE; |
1166 | ||
56851698 | 1167 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1168 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
1169 | size, buf->sent, *count, *sent, res); | |
1170 | if (res >= 0) { | |
7ba24713 AA |
1171 | *count -= res; |
1172 | *sent += res; | |
1173 | if (size != res) | |
1174 | return -EAGAIN; | |
1175 | return 0; | |
3219e529 | 1176 | } |
7ba24713 AA |
1177 | |
1178 | return res; | |
1179 | } | |
1180 | ||
1181 | static inline void | |
5bb0b55a MC |
1182 | iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
1183 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1184 | { |
5bb0b55a MC |
1185 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1186 | ||
1187 | BUG_ON(!tcp_conn->data_tx_tfm); | |
1188 | crypto_digest_init(tcp_conn->data_tx_tfm); | |
1189 | tcp_ctask->digest_count = 4; | |
7ba24713 AA |
1190 | } |
1191 | ||
858119e1 | 1192 | static int |
7ba24713 AA |
1193 | iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
1194 | struct iscsi_buf *buf, uint32_t *digest, int final) | |
1195 | { | |
5bb0b55a MC |
1196 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1197 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 AA |
1198 | int rc = 0; |
1199 | int sent = 0; | |
1200 | ||
1201 | if (final) | |
5bb0b55a | 1202 | crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest); |
7ba24713 | 1203 | |
6e458cc9 | 1204 | iscsi_buf_init_iov(buf, (char*)digest, 4); |
5bb0b55a | 1205 | rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
7ba24713 | 1206 | if (rc) { |
5bb0b55a MC |
1207 | tcp_ctask->datadigest = *digest; |
1208 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; | |
7ba24713 | 1209 | } else |
5bb0b55a | 1210 | tcp_ctask->digest_count = 4; |
7ba24713 AA |
1211 | return rc; |
1212 | } | |
1213 | ||
1214 | /** | |
1215 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1216 | * @conn: iscsi connection | |
1217 | * @ctask: scsi command task | |
1218 | * @r2t: R2T info | |
1219 | * @left: bytes left to transfer | |
1220 | * | |
1221 | * Notes: | |
1222 | * Initialize next Data-Out within this R2T sequence and continue | |
1223 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1224 | * | |
1225 | * Called under connection lock. | |
1226 | **/ | |
1227 | static void | |
1228 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1229 | struct iscsi_r2t_info *r2t, int left) | |
1230 | { | |
5bb0b55a | 1231 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1232 | struct iscsi_data *hdr; |
7ba24713 AA |
1233 | struct scsi_cmnd *sc = ctask->sc; |
1234 | int new_offset; | |
1235 | ||
ffbfe925 | 1236 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
1237 | memset(hdr, 0, sizeof(struct iscsi_data)); |
1238 | hdr->ttt = r2t->ttt; | |
1239 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1240 | r2t->solicit_datasn++; | |
1241 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
1242 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
1243 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
1244 | hdr->exp_statsn = r2t->exp_statsn; |
1245 | new_offset = r2t->data_offset + r2t->sent; | |
1246 | hdr->offset = cpu_to_be32(new_offset); | |
1247 | if (left > conn->max_xmit_dlength) { | |
1248 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1249 | r2t->data_count = conn->max_xmit_dlength; | |
1250 | } else { | |
1251 | hton24(hdr->dlength, left); | |
1252 | r2t->data_count = left; | |
1253 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1254 | } | |
1255 | conn->dataout_pdus_cnt++; | |
1256 | ||
6e458cc9 | 1257 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 1258 | sizeof(struct iscsi_hdr)); |
7ba24713 | 1259 | |
7ba24713 | 1260 | if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { |
5bb0b55a | 1261 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
7ba24713 AA |
1262 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1263 | r2t->sg += 1; | |
1264 | } else | |
5bb0b55a | 1265 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
7ba24713 AA |
1266 | (char*)sc->request_buffer + new_offset, |
1267 | r2t->data_count); | |
7ba24713 AA |
1268 | } |
1269 | ||
1270 | static void | |
1271 | iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1272 | { | |
5bb0b55a | 1273 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1274 | struct iscsi_data_task *dtask; |
1275 | ||
ffbfe925 | 1276 | dtask = tcp_ctask->dtask = &tcp_ctask->unsol_dtask; |
5bb0b55a MC |
1277 | iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr, |
1278 | tcp_ctask->r2t_data_count); | |
6e458cc9 | 1279 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, |
af973481 | 1280 | sizeof(struct iscsi_hdr)); |
7ba24713 AA |
1281 | } |
1282 | ||
1283 | /** | |
5bb0b55a | 1284 | * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 AA |
1285 | * @conn: iscsi connection |
1286 | * @ctask: scsi command task | |
1287 | * @sc: scsi command | |
1288 | **/ | |
1289 | static void | |
5bb0b55a | 1290 | iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
7ba24713 | 1291 | { |
5bb0b55a MC |
1292 | struct scsi_cmnd *sc = ctask->sc; |
1293 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 1294 | |
5bb0b55a | 1295 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
7ba24713 | 1296 | |
5bb0b55a MC |
1297 | tcp_ctask->sent = 0; |
1298 | tcp_ctask->sg_count = 0; | |
7ba24713 AA |
1299 | |
1300 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
5bb0b55a MC |
1301 | tcp_ctask->xmstate = XMSTATE_W_HDR; |
1302 | tcp_ctask->exp_r2tsn = 0; | |
7ba24713 | 1303 | BUG_ON(ctask->total_length == 0); |
5bb0b55a | 1304 | |
7ba24713 AA |
1305 | if (sc->use_sg) { |
1306 | struct scatterlist *sg = sc->request_buffer; | |
1307 | ||
5bb0b55a MC |
1308 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1309 | &sg[tcp_ctask->sg_count++]); | |
1310 | tcp_ctask->sg = sg; | |
1311 | tcp_ctask->bad_sg = sg + sc->use_sg; | |
1312 | } else | |
1313 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, | |
1314 | sc->request_buffer, | |
1315 | sc->request_bufflen); | |
7ba24713 | 1316 | |
5bb0b55a MC |
1317 | if (ctask->imm_count) |
1318 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; | |
1319 | ||
1320 | tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); | |
1321 | if (tcp_ctask->pad_count) { | |
1322 | tcp_ctask->pad_count = ISCSI_PAD_LEN - | |
1323 | tcp_ctask->pad_count; | |
7ba24713 | 1324 | debug_scsi("write padding %d bytes\n", |
5bb0b55a MC |
1325 | tcp_ctask->pad_count); |
1326 | tcp_ctask->xmstate |= XMSTATE_W_PAD; | |
7ba24713 | 1327 | } |
7ba24713 | 1328 | |
5bb0b55a MC |
1329 | if (ctask->unsol_count) |
1330 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR | | |
1331 | XMSTATE_UNS_INIT; | |
1332 | tcp_ctask->r2t_data_count = ctask->total_length - | |
7ba24713 AA |
1333 | ctask->imm_count - |
1334 | ctask->unsol_count; | |
1335 | ||
b6c395ed | 1336 | debug_scsi("cmd [itt 0x%x total %d imm %d imm_data %d " |
7ba24713 AA |
1337 | "r2t_data %d]\n", |
1338 | ctask->itt, ctask->total_length, ctask->imm_count, | |
5bb0b55a MC |
1339 | ctask->unsol_count, tcp_ctask->r2t_data_count); |
1340 | } else | |
1341 | tcp_ctask->xmstate = XMSTATE_R_HDR; | |
7ba24713 | 1342 | |
6e458cc9 | 1343 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, |
af973481 | 1344 | sizeof(struct iscsi_hdr)); |
7ba24713 AA |
1345 | } |
1346 | ||
1347 | /** | |
5bb0b55a | 1348 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
7ba24713 AA |
1349 | * @conn: iscsi connection |
1350 | * @mtask: task management task | |
1351 | * | |
1352 | * Notes: | |
1353 | * The function can return -EAGAIN in which case caller must | |
1354 | * call it again later, or recover. '0' return code means successful | |
1355 | * xmit. | |
1356 | * | |
1357 | * Management xmit state machine consists of two states: | |
1358 | * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress | |
1359 | * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress | |
1360 | **/ | |
1361 | static int | |
5bb0b55a | 1362 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1363 | { |
5bb0b55a | 1364 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
3219e529 | 1365 | int rc; |
7ba24713 AA |
1366 | |
1367 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", | |
5bb0b55a | 1368 | conn->id, tcp_mtask->xmstate, mtask->itt); |
7ba24713 | 1369 | |
5bb0b55a MC |
1370 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { |
1371 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; | |
7ba24713 | 1372 | if (mtask->data_count) |
5bb0b55a | 1373 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
af973481 | 1374 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
30a6c652 | 1375 | conn->stop_stage != STOP_CONN_RECOVER && |
af973481 | 1376 | conn->hdrdgst_en) |
5bb0b55a MC |
1377 | iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
1378 | (u8*)tcp_mtask->hdrext); | |
3219e529 MC |
1379 | rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf, |
1380 | mtask->data_count); | |
1381 | if (rc) { | |
5bb0b55a | 1382 | tcp_mtask->xmstate |= XMSTATE_IMM_HDR; |
7ba24713 | 1383 | if (mtask->data_count) |
5bb0b55a | 1384 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
3219e529 | 1385 | return rc; |
7ba24713 AA |
1386 | } |
1387 | } | |
1388 | ||
5bb0b55a | 1389 | if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 | 1390 | BUG_ON(!mtask->data_count); |
5bb0b55a | 1391 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1392 | /* FIXME: implement. |
1393 | * Virtual buffer could be spreaded across multiple pages... | |
1394 | */ | |
1395 | do { | |
3219e529 MC |
1396 | int rc; |
1397 | ||
1398 | rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf, | |
1399 | &mtask->data_count, &tcp_mtask->sent); | |
1400 | if (rc) { | |
5bb0b55a | 1401 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
3219e529 | 1402 | return rc; |
7ba24713 AA |
1403 | } |
1404 | } while (mtask->data_count); | |
1405 | } | |
1406 | ||
5bb0b55a MC |
1407 | BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
1408 | if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
1409 | struct iscsi_session *session = conn->session; | |
1410 | ||
1411 | spin_lock_bh(&session->lock); | |
1412 | list_del(&conn->mtask->running); | |
1413 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, | |
1414 | sizeof(void*)); | |
1415 | spin_unlock_bh(&session->lock); | |
1416 | } | |
7ba24713 AA |
1417 | return 0; |
1418 | } | |
1419 | ||
1420 | static inline int | |
5bb0b55a MC |
1421 | handle_xmstate_r_hdr(struct iscsi_conn *conn, |
1422 | struct iscsi_tcp_cmd_task *tcp_ctask) | |
7ba24713 | 1423 | { |
3219e529 MC |
1424 | int rc; |
1425 | ||
5bb0b55a | 1426 | tcp_ctask->xmstate &= ~XMSTATE_R_HDR; |
42f72aa9 | 1427 | if (conn->hdrdgst_en) |
5bb0b55a MC |
1428 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
1429 | (u8*)tcp_ctask->hdrext); | |
3219e529 MC |
1430 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0); |
1431 | if (!rc) { | |
5bb0b55a | 1432 | BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE); |
7ba24713 AA |
1433 | return 0; /* wait for Data-In */ |
1434 | } | |
5bb0b55a | 1435 | tcp_ctask->xmstate |= XMSTATE_R_HDR; |
3219e529 | 1436 | return rc; |
7ba24713 AA |
1437 | } |
1438 | ||
1439 | static inline int | |
5bb0b55a MC |
1440 | handle_xmstate_w_hdr(struct iscsi_conn *conn, |
1441 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1442 | { |
5bb0b55a | 1443 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1444 | int rc; |
5bb0b55a MC |
1445 | |
1446 | tcp_ctask->xmstate &= ~XMSTATE_W_HDR; | |
42f72aa9 | 1447 | if (conn->hdrdgst_en) |
5bb0b55a MC |
1448 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
1449 | (u8*)tcp_ctask->hdrext); | |
3219e529 MC |
1450 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count); |
1451 | if (rc) | |
5bb0b55a | 1452 | tcp_ctask->xmstate |= XMSTATE_W_HDR; |
3219e529 | 1453 | return rc; |
7ba24713 AA |
1454 | } |
1455 | ||
1456 | static inline int | |
1457 | handle_xmstate_data_digest(struct iscsi_conn *conn, | |
1458 | struct iscsi_cmd_task *ctask) | |
1459 | { | |
5bb0b55a | 1460 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1461 | int rc; |
5bb0b55a MC |
1462 | |
1463 | tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST; | |
1464 | debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest); | |
3219e529 MC |
1465 | rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, |
1466 | &tcp_ctask->datadigest, 0); | |
1467 | if (rc) { | |
5bb0b55a | 1468 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; |
7ba24713 | 1469 | debug_tcp("resent data digest 0x%x fail!\n", |
5bb0b55a | 1470 | tcp_ctask->datadigest); |
7ba24713 | 1471 | } |
3219e529 MC |
1472 | |
1473 | return rc; | |
7ba24713 AA |
1474 | } |
1475 | ||
1476 | static inline int | |
1477 | handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1478 | { | |
5bb0b55a MC |
1479 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1480 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
3219e529 | 1481 | int rc; |
5bb0b55a | 1482 | |
7ba24713 | 1483 | BUG_ON(!ctask->imm_count); |
5bb0b55a | 1484 | tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1485 | |
1486 | if (conn->datadgst_en) { | |
5bb0b55a MC |
1487 | iscsi_data_digest_init(tcp_conn, ctask); |
1488 | tcp_ctask->immdigest = 0; | |
7ba24713 AA |
1489 | } |
1490 | ||
1491 | for (;;) { | |
3219e529 MC |
1492 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
1493 | &ctask->imm_count, &tcp_ctask->sent); | |
1494 | if (rc) { | |
5bb0b55a | 1495 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; |
7ba24713 | 1496 | if (conn->datadgst_en) { |
5bb0b55a MC |
1497 | crypto_digest_final(tcp_conn->data_tx_tfm, |
1498 | (u8*)&tcp_ctask->immdigest); | |
7ba24713 | 1499 | debug_tcp("tx imm sendpage fail 0x%x\n", |
5bb0b55a | 1500 | tcp_ctask->datadigest); |
7ba24713 | 1501 | } |
3219e529 | 1502 | return rc; |
7ba24713 AA |
1503 | } |
1504 | if (conn->datadgst_en) | |
5bb0b55a MC |
1505 | crypto_digest_update(tcp_conn->data_tx_tfm, |
1506 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1507 | |
1508 | if (!ctask->imm_count) | |
1509 | break; | |
5bb0b55a MC |
1510 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1511 | &tcp_ctask->sg[tcp_ctask->sg_count++]); | |
7ba24713 AA |
1512 | } |
1513 | ||
5bb0b55a | 1514 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
3219e529 MC |
1515 | rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, |
1516 | &tcp_ctask->immdigest, 1); | |
1517 | if (rc) { | |
7ba24713 | 1518 | debug_tcp("sending imm digest 0x%x fail!\n", |
5bb0b55a | 1519 | tcp_ctask->immdigest); |
3219e529 | 1520 | return rc; |
7ba24713 | 1521 | } |
5bb0b55a | 1522 | debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest); |
7ba24713 AA |
1523 | } |
1524 | ||
1525 | return 0; | |
1526 | } | |
1527 | ||
1528 | static inline int | |
1529 | handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1530 | { | |
5bb0b55a | 1531 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1532 | struct iscsi_data_task *dtask; |
3219e529 | 1533 | int rc; |
7ba24713 | 1534 | |
5bb0b55a MC |
1535 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
1536 | if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { | |
7ba24713 | 1537 | iscsi_unsolicit_data_init(conn, ctask); |
5bb0b55a | 1538 | dtask = tcp_ctask->dtask; |
af973481 | 1539 | if (conn->hdrdgst_en) |
5bb0b55a | 1540 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
af973481 | 1541 | (u8*)dtask->hdrext); |
5bb0b55a | 1542 | tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
7ba24713 | 1543 | } |
3219e529 MC |
1544 | |
1545 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count); | |
1546 | if (rc) { | |
5bb0b55a MC |
1547 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
1548 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR; | |
3219e529 | 1549 | return rc; |
7ba24713 AA |
1550 | } |
1551 | ||
1552 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", | |
5bb0b55a | 1553 | ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
7ba24713 AA |
1554 | return 0; |
1555 | } | |
1556 | ||
1557 | static inline int | |
1558 | handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1559 | { | |
5bb0b55a MC |
1560 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1561 | struct iscsi_data_task *dtask = tcp_ctask->dtask; | |
1562 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
3219e529 | 1563 | int rc; |
7ba24713 AA |
1564 | |
1565 | BUG_ON(!ctask->data_count); | |
5bb0b55a | 1566 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
7ba24713 AA |
1567 | |
1568 | if (conn->datadgst_en) { | |
5bb0b55a | 1569 | iscsi_data_digest_init(tcp_conn, ctask); |
7ba24713 AA |
1570 | dtask->digest = 0; |
1571 | } | |
1572 | ||
1573 | for (;;) { | |
5bb0b55a | 1574 | int start = tcp_ctask->sent; |
7ba24713 | 1575 | |
3219e529 MC |
1576 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
1577 | &ctask->data_count, &tcp_ctask->sent); | |
1578 | if (rc) { | |
5bb0b55a MC |
1579 | ctask->unsol_count -= tcp_ctask->sent - start; |
1580 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; | |
7ba24713 AA |
1581 | /* will continue with this ctask later.. */ |
1582 | if (conn->datadgst_en) { | |
5bb0b55a | 1583 | crypto_digest_final(tcp_conn->data_tx_tfm, |
7ba24713 AA |
1584 | (u8 *)&dtask->digest); |
1585 | debug_tcp("tx uns data fail 0x%x\n", | |
1586 | dtask->digest); | |
1587 | } | |
3219e529 | 1588 | return rc; |
7ba24713 AA |
1589 | } |
1590 | ||
5bb0b55a MC |
1591 | BUG_ON(tcp_ctask->sent > ctask->total_length); |
1592 | ctask->unsol_count -= tcp_ctask->sent - start; | |
7ba24713 AA |
1593 | |
1594 | /* | |
1595 | * XXX:we may run here with un-initial sendbuf. | |
1596 | * so pass it | |
1597 | */ | |
5bb0b55a MC |
1598 | if (conn->datadgst_en && tcp_ctask->sent - start > 0) |
1599 | crypto_digest_update(tcp_conn->data_tx_tfm, | |
1600 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1601 | |
1602 | if (!ctask->data_count) | |
1603 | break; | |
5bb0b55a MC |
1604 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1605 | &tcp_ctask->sg[tcp_ctask->sg_count++]); | |
7ba24713 AA |
1606 | } |
1607 | BUG_ON(ctask->unsol_count < 0); | |
1608 | ||
1609 | /* | |
1610 | * Done with the Data-Out. Next, check if we need | |
1611 | * to send another unsolicited Data-Out. | |
1612 | */ | |
1613 | if (ctask->unsol_count) { | |
1614 | if (conn->datadgst_en) { | |
3219e529 | 1615 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1616 | &dtask->digestbuf, |
3219e529 MC |
1617 | &dtask->digest, 1); |
1618 | if (rc) { | |
7ba24713 AA |
1619 | debug_tcp("send uns digest 0x%x fail\n", |
1620 | dtask->digest); | |
3219e529 | 1621 | return rc; |
7ba24713 AA |
1622 | } |
1623 | debug_tcp("sending uns digest 0x%x, more uns\n", | |
1624 | dtask->digest); | |
1625 | } | |
5bb0b55a | 1626 | tcp_ctask->xmstate |= XMSTATE_UNS_INIT; |
7ba24713 AA |
1627 | return 1; |
1628 | } | |
1629 | ||
5bb0b55a | 1630 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
3219e529 | 1631 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1632 | &dtask->digestbuf, |
3219e529 MC |
1633 | &dtask->digest, 1); |
1634 | if (rc) { | |
7ba24713 AA |
1635 | debug_tcp("send last uns digest 0x%x fail\n", |
1636 | dtask->digest); | |
3219e529 | 1637 | return rc; |
7ba24713 AA |
1638 | } |
1639 | debug_tcp("sending uns digest 0x%x\n",dtask->digest); | |
1640 | } | |
1641 | ||
1642 | return 0; | |
1643 | } | |
1644 | ||
1645 | static inline int | |
1646 | handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1647 | { | |
1648 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
1649 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1650 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1651 | struct iscsi_r2t_info *r2t = tcp_ctask->r2t; | |
ffbfe925 | 1652 | struct iscsi_data_task *dtask = &r2t->dtask; |
3219e529 | 1653 | int left, rc; |
7ba24713 | 1654 | |
5bb0b55a MC |
1655 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
1656 | tcp_ctask->dtask = dtask; | |
7ba24713 AA |
1657 | |
1658 | if (conn->datadgst_en) { | |
5bb0b55a | 1659 | iscsi_data_digest_init(tcp_conn, ctask); |
7ba24713 AA |
1660 | dtask->digest = 0; |
1661 | } | |
1662 | solicit_again: | |
1663 | /* | |
b6c395ed | 1664 | * send Data-Out within this R2T sequence. |
7ba24713 AA |
1665 | */ |
1666 | if (!r2t->data_count) | |
1667 | goto data_out_done; | |
1668 | ||
3219e529 MC |
1669 | rc = iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent); |
1670 | if (rc) { | |
5bb0b55a | 1671 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
7ba24713 AA |
1672 | /* will continue with this ctask later.. */ |
1673 | if (conn->datadgst_en) { | |
5bb0b55a | 1674 | crypto_digest_final(tcp_conn->data_tx_tfm, |
7ba24713 AA |
1675 | (u8 *)&dtask->digest); |
1676 | debug_tcp("r2t data send fail 0x%x\n", dtask->digest); | |
1677 | } | |
3219e529 | 1678 | return rc; |
7ba24713 AA |
1679 | } |
1680 | ||
1681 | BUG_ON(r2t->data_count < 0); | |
1682 | if (conn->datadgst_en) | |
5bb0b55a MC |
1683 | crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg, |
1684 | 1); | |
7ba24713 AA |
1685 | |
1686 | if (r2t->data_count) { | |
1687 | BUG_ON(ctask->sc->use_sg == 0); | |
1688 | if (!iscsi_buf_left(&r2t->sendbuf)) { | |
5bb0b55a | 1689 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
7ba24713 AA |
1690 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1691 | r2t->sg += 1; | |
1692 | } | |
1693 | goto solicit_again; | |
1694 | } | |
1695 | ||
1696 | data_out_done: | |
1697 | /* | |
1698 | * Done with this Data-Out. Next, check if we have | |
1699 | * to send another Data-Out for this R2T. | |
1700 | */ | |
1701 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1702 | left = r2t->data_length - r2t->sent; | |
1703 | if (left) { | |
1704 | if (conn->datadgst_en) { | |
3219e529 | 1705 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1706 | &dtask->digestbuf, |
3219e529 MC |
1707 | &dtask->digest, 1); |
1708 | if (rc) { | |
7ba24713 AA |
1709 | debug_tcp("send r2t data digest 0x%x" |
1710 | "fail\n", dtask->digest); | |
3219e529 | 1711 | return rc; |
7ba24713 AA |
1712 | } |
1713 | debug_tcp("r2t data send digest 0x%x\n", | |
1714 | dtask->digest); | |
1715 | } | |
1716 | iscsi_solicit_data_cont(conn, ctask, r2t, left); | |
5bb0b55a MC |
1717 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
1718 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
7ba24713 AA |
1719 | return 1; |
1720 | } | |
1721 | ||
1722 | /* | |
1723 | * Done with this R2T. Check if there are more | |
1724 | * outstanding R2Ts ready to be processed. | |
1725 | */ | |
5bb0b55a | 1726 | BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0); |
7ba24713 | 1727 | if (conn->datadgst_en) { |
3219e529 MC |
1728 | rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, |
1729 | &dtask->digest, 1); | |
1730 | if (rc) { | |
7ba24713 AA |
1731 | debug_tcp("send last r2t data digest 0x%x" |
1732 | "fail\n", dtask->digest); | |
3219e529 | 1733 | return rc; |
7ba24713 AA |
1734 | } |
1735 | debug_tcp("r2t done dout digest 0x%x\n", dtask->digest); | |
1736 | } | |
1737 | ||
5bb0b55a MC |
1738 | tcp_ctask->r2t_data_count -= r2t->data_length; |
1739 | tcp_ctask->r2t = NULL; | |
7ba24713 | 1740 | spin_lock_bh(&session->lock); |
5bb0b55a | 1741 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 | 1742 | spin_unlock_bh(&session->lock); |
5bb0b55a MC |
1743 | if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { |
1744 | tcp_ctask->r2t = r2t; | |
1745 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
1746 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
7ba24713 AA |
1747 | return 1; |
1748 | } | |
1749 | ||
1750 | return 0; | |
1751 | } | |
1752 | ||
1753 | static inline int | |
1754 | handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1755 | { | |
5bb0b55a MC |
1756 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1757 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1758 | struct iscsi_data_task *dtask = tcp_ctask->dtask; | |
b6c395ed | 1759 | int sent = 0, rc; |
7ba24713 | 1760 | |
5bb0b55a | 1761 | tcp_ctask->xmstate &= ~XMSTATE_W_PAD; |
6e458cc9 | 1762 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, |
5bb0b55a | 1763 | tcp_ctask->pad_count); |
3219e529 MC |
1764 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, |
1765 | &sent); | |
1766 | if (rc) { | |
5bb0b55a | 1767 | tcp_ctask->xmstate |= XMSTATE_W_PAD; |
3219e529 | 1768 | return rc; |
7ba24713 AA |
1769 | } |
1770 | ||
1771 | if (conn->datadgst_en) { | |
5bb0b55a MC |
1772 | crypto_digest_update(tcp_conn->data_tx_tfm, |
1773 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1774 | /* imm data? */ |
1775 | if (!dtask) { | |
3219e529 | 1776 | rc = iscsi_digest_final_send(conn, ctask, |
5bb0b55a | 1777 | &tcp_ctask->immbuf, |
3219e529 MC |
1778 | &tcp_ctask->immdigest, 1); |
1779 | if (rc) { | |
7ba24713 | 1780 | debug_tcp("send padding digest 0x%x" |
5bb0b55a | 1781 | "fail!\n", tcp_ctask->immdigest); |
3219e529 | 1782 | return rc; |
7ba24713 AA |
1783 | } |
1784 | debug_tcp("done with padding, digest 0x%x\n", | |
5bb0b55a | 1785 | tcp_ctask->datadigest); |
7ba24713 | 1786 | } else { |
3219e529 | 1787 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1788 | &dtask->digestbuf, |
3219e529 MC |
1789 | &dtask->digest, 1); |
1790 | if (rc) { | |
7ba24713 AA |
1791 | debug_tcp("send padding digest 0x%x" |
1792 | "fail\n", dtask->digest); | |
3219e529 | 1793 | return rc; |
7ba24713 AA |
1794 | } |
1795 | debug_tcp("done with padding, digest 0x%x\n", | |
1796 | dtask->digest); | |
1797 | } | |
1798 | } | |
1799 | ||
1800 | return 0; | |
1801 | } | |
1802 | ||
1803 | static int | |
5bb0b55a | 1804 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 1805 | { |
5bb0b55a | 1806 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1807 | int rc = 0; |
1808 | ||
1809 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", | |
5bb0b55a | 1810 | conn->id, tcp_ctask->xmstate, ctask->itt); |
7ba24713 AA |
1811 | |
1812 | /* | |
1813 | * serialize with TMF AbortTask | |
1814 | */ | |
1815 | if (ctask->mtask) | |
1816 | return rc; | |
1817 | ||
3219e529 MC |
1818 | if (tcp_ctask->xmstate & XMSTATE_R_HDR) |
1819 | return handle_xmstate_r_hdr(conn, tcp_ctask); | |
7ba24713 | 1820 | |
5bb0b55a | 1821 | if (tcp_ctask->xmstate & XMSTATE_W_HDR) { |
7ba24713 AA |
1822 | rc = handle_xmstate_w_hdr(conn, ctask); |
1823 | if (rc) | |
1824 | return rc; | |
1825 | } | |
1826 | ||
1827 | /* XXX: for data digest xmit recover */ | |
5bb0b55a | 1828 | if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) { |
7ba24713 AA |
1829 | rc = handle_xmstate_data_digest(conn, ctask); |
1830 | if (rc) | |
1831 | return rc; | |
1832 | } | |
1833 | ||
5bb0b55a | 1834 | if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 AA |
1835 | rc = handle_xmstate_imm_data(conn, ctask); |
1836 | if (rc) | |
1837 | return rc; | |
1838 | } | |
1839 | ||
5bb0b55a | 1840 | if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
7ba24713 | 1841 | BUG_ON(!ctask->unsol_count); |
5bb0b55a | 1842 | tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; |
7ba24713 AA |
1843 | unsolicit_head_again: |
1844 | rc = handle_xmstate_uns_hdr(conn, ctask); | |
1845 | if (rc) | |
1846 | return rc; | |
1847 | } | |
1848 | ||
5bb0b55a | 1849 | if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
7ba24713 AA |
1850 | rc = handle_xmstate_uns_data(conn, ctask); |
1851 | if (rc == 1) | |
1852 | goto unsolicit_head_again; | |
1853 | else if (rc) | |
1854 | return rc; | |
1855 | goto done; | |
1856 | } | |
1857 | ||
5bb0b55a | 1858 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { |
7ba24713 AA |
1859 | struct iscsi_r2t_info *r2t; |
1860 | ||
5bb0b55a MC |
1861 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
1862 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
1863 | if (!tcp_ctask->r2t) | |
1864 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, | |
7ba24713 AA |
1865 | sizeof(void*)); |
1866 | solicit_head_again: | |
5bb0b55a | 1867 | r2t = tcp_ctask->r2t; |
af973481 | 1868 | if (conn->hdrdgst_en) |
42f72aa9 | 1869 | iscsi_hdr_digest(conn, &r2t->headbuf, |
ffbfe925 | 1870 | (u8*)r2t->dtask.hdrext); |
3219e529 MC |
1871 | rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count); |
1872 | if (rc) { | |
5bb0b55a MC |
1873 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
1874 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
3219e529 | 1875 | return rc; |
7ba24713 AA |
1876 | } |
1877 | ||
1878 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", | |
1879 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, | |
1880 | r2t->sent); | |
1881 | } | |
1882 | ||
5bb0b55a | 1883 | if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
7ba24713 AA |
1884 | rc = handle_xmstate_sol_data(conn, ctask); |
1885 | if (rc == 1) | |
1886 | goto solicit_head_again; | |
1887 | if (rc) | |
1888 | return rc; | |
1889 | } | |
1890 | ||
1891 | done: | |
1892 | /* | |
1893 | * Last thing to check is whether we need to send write | |
1894 | * padding. Note that we check for xmstate equality, not just the bit. | |
1895 | */ | |
5bb0b55a | 1896 | if (tcp_ctask->xmstate == XMSTATE_W_PAD) |
7ba24713 AA |
1897 | rc = handle_xmstate_w_pad(conn, ctask); |
1898 | ||
1899 | return rc; | |
1900 | } | |
1901 | ||
5bb0b55a MC |
1902 | static struct iscsi_cls_conn * |
1903 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1904 | { |
5bb0b55a MC |
1905 | struct iscsi_conn *conn; |
1906 | struct iscsi_cls_conn *cls_conn; | |
1907 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1908 | |
5bb0b55a MC |
1909 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
1910 | if (!cls_conn) | |
1911 | return NULL; | |
1912 | conn = cls_conn->dd_data; | |
7ba24713 | 1913 | /* |
5bb0b55a MC |
1914 | * due to strange issues with iser these are not set |
1915 | * in iscsi_conn_setup | |
7ba24713 | 1916 | */ |
5bb0b55a | 1917 | conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; |
7ba24713 | 1918 | |
5bb0b55a MC |
1919 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
1920 | if (!tcp_conn) | |
1921 | goto tcp_conn_alloc_fail; | |
7ba24713 | 1922 | |
5bb0b55a MC |
1923 | conn->dd_data = tcp_conn; |
1924 | tcp_conn->iscsi_conn = conn; | |
1925 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
1926 | /* initial operational parameters */ | |
1927 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); | |
7ba24713 | 1928 | |
5bb0b55a | 1929 | return cls_conn; |
7ba24713 | 1930 | |
5bb0b55a MC |
1931 | tcp_conn_alloc_fail: |
1932 | iscsi_conn_teardown(cls_conn); | |
1933 | return NULL; | |
7ba24713 AA |
1934 | } |
1935 | ||
1c83469d MC |
1936 | static void |
1937 | iscsi_tcp_release_conn(struct iscsi_conn *conn) | |
1938 | { | |
1939 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1940 | ||
1941 | if (!tcp_conn->sock) | |
1942 | return; | |
1943 | ||
1944 | sock_hold(tcp_conn->sock->sk); | |
1945 | iscsi_conn_restore_callbacks(tcp_conn); | |
1946 | sock_put(tcp_conn->sock->sk); | |
1947 | ||
1948 | sock_release(tcp_conn->sock); | |
1949 | tcp_conn->sock = NULL; | |
1950 | conn->recv_lock = NULL; | |
1951 | } | |
1952 | ||
7ba24713 | 1953 | static void |
5bb0b55a | 1954 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1955 | { |
5bb0b55a MC |
1956 | struct iscsi_conn *conn = cls_conn->dd_data; |
1957 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1958 | int digest = 0; | |
7ba24713 | 1959 | |
5bb0b55a MC |
1960 | if (conn->hdrdgst_en || conn->datadgst_en) |
1961 | digest = 1; | |
7ba24713 | 1962 | |
1c83469d | 1963 | iscsi_tcp_release_conn(conn); |
5bb0b55a | 1964 | iscsi_conn_teardown(cls_conn); |
7ba24713 | 1965 | |
5bb0b55a MC |
1966 | /* now free tcp_conn */ |
1967 | if (digest) { | |
1968 | if (tcp_conn->tx_tfm) | |
1969 | crypto_free_tfm(tcp_conn->tx_tfm); | |
1970 | if (tcp_conn->rx_tfm) | |
1971 | crypto_free_tfm(tcp_conn->rx_tfm); | |
1972 | if (tcp_conn->data_tx_tfm) | |
1973 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
1974 | if (tcp_conn->data_rx_tfm) | |
1975 | crypto_free_tfm(tcp_conn->data_rx_tfm); | |
1976 | } | |
7ba24713 | 1977 | |
5bb0b55a MC |
1978 | kfree(tcp_conn); |
1979 | } | |
7ba24713 | 1980 | |
1c83469d MC |
1981 | static void |
1982 | iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1983 | { | |
1984 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1985 | ||
1986 | iscsi_conn_stop(cls_conn, flag); | |
1987 | iscsi_tcp_release_conn(conn); | |
1988 | } | |
1989 | ||
5bb0b55a MC |
1990 | static int |
1991 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1992 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1993 | int is_leading) |
1994 | { | |
1995 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1996 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1997 | struct sock *sk; | |
1998 | struct socket *sock; | |
1999 | int err; | |
7ba24713 | 2000 | |
5bb0b55a | 2001 | /* lookup for existing socket */ |
264faaaa | 2002 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a MC |
2003 | if (!sock) { |
2004 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); | |
2005 | return -EEXIST; | |
7ba24713 AA |
2006 | } |
2007 | ||
5bb0b55a MC |
2008 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
2009 | if (err) | |
2010 | return err; | |
7ba24713 | 2011 | |
67a61114 MC |
2012 | /* bind iSCSI connection and socket */ |
2013 | tcp_conn->sock = sock; | |
7ba24713 | 2014 | |
67a61114 MC |
2015 | /* setup Socket parameters */ |
2016 | sk = sock->sk; | |
2017 | sk->sk_reuse = 1; | |
2018 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
2019 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 2020 | |
67a61114 | 2021 | /* FIXME: disable Nagle's algorithm */ |
7ba24713 | 2022 | |
67a61114 MC |
2023 | /* |
2024 | * Intercept TCP callbacks for sendfile like receive | |
2025 | * processing. | |
2026 | */ | |
2027 | conn->recv_lock = &sk->sk_callback_lock; | |
2028 | iscsi_conn_set_callbacks(conn); | |
2029 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; | |
2030 | /* | |
2031 | * set receive state machine into initial state | |
2032 | */ | |
2033 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 | 2034 | |
7ba24713 AA |
2035 | return 0; |
2036 | } | |
2037 | ||
5bb0b55a | 2038 | /* called with host lock */ |
30a6c652 | 2039 | static void |
5bb0b55a MC |
2040 | iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask, |
2041 | char *data, uint32_t data_size) | |
7ba24713 | 2042 | { |
5bb0b55a | 2043 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
7ba24713 | 2044 | |
6e458cc9 MC |
2045 | iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr, |
2046 | sizeof(struct iscsi_hdr)); | |
5bb0b55a | 2047 | tcp_mtask->xmstate = XMSTATE_IMM_HDR; |
b6c395ed | 2048 | tcp_mtask->sent = 0; |
7ba24713 | 2049 | |
5bb0b55a MC |
2050 | if (mtask->data_count) |
2051 | iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data, | |
7ba24713 | 2052 | mtask->data_count); |
7ba24713 AA |
2053 | } |
2054 | ||
2055 | static int | |
2056 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
2057 | { | |
2058 | int i; | |
2059 | int cmd_i; | |
2060 | ||
2061 | /* | |
2062 | * initialize per-task: R2T pool and xmit queue | |
2063 | */ | |
2064 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2065 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
5bb0b55a | 2066 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
2067 | |
2068 | /* | |
2069 | * pre-allocated x4 as much r2ts to handle race when | |
2070 | * target acks DataOut faster than we data_xmit() queues | |
2071 | * could replenish r2tqueue. | |
2072 | */ | |
2073 | ||
2074 | /* R2T pool */ | |
5bb0b55a MC |
2075 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
2076 | (void***)&tcp_ctask->r2ts, | |
2077 | sizeof(struct iscsi_r2t_info))) { | |
7ba24713 AA |
2078 | goto r2t_alloc_fail; |
2079 | } | |
2080 | ||
2081 | /* R2T xmit queue */ | |
5bb0b55a | 2082 | tcp_ctask->r2tqueue = kfifo_alloc( |
7ba24713 | 2083 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
5bb0b55a MC |
2084 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
2085 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2086 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2087 | goto r2t_alloc_fail; |
2088 | } | |
7ba24713 AA |
2089 | } |
2090 | ||
2091 | return 0; | |
2092 | ||
2093 | r2t_alloc_fail: | |
2094 | for (i = 0; i < cmd_i; i++) { | |
5bb0b55a MC |
2095 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2096 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2097 | ||
5bb0b55a MC |
2098 | kfifo_free(tcp_ctask->r2tqueue); |
2099 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2100 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2101 | } |
2102 | return -ENOMEM; | |
2103 | } | |
2104 | ||
2105 | static void | |
2106 | iscsi_r2tpool_free(struct iscsi_session *session) | |
2107 | { | |
2108 | int i; | |
2109 | ||
2110 | for (i = 0; i < session->cmds_max; i++) { | |
5bb0b55a MC |
2111 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2112 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 2113 | |
5bb0b55a MC |
2114 | kfifo_free(tcp_ctask->r2tqueue); |
2115 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2116 | (void**)tcp_ctask->r2ts); | |
7ba24713 | 2117 | } |
7ba24713 AA |
2118 | } |
2119 | ||
2120 | static int | |
7b7232f3 | 2121 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
5c75b7fc | 2122 | char *buf, int buflen) |
7ba24713 | 2123 | { |
7b7232f3 | 2124 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 2125 | struct iscsi_session *session = conn->session; |
5bb0b55a | 2126 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5c75b7fc | 2127 | int value; |
7ba24713 | 2128 | |
7ba24713 | 2129 | switch(param) { |
7ba24713 | 2130 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 2131 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a | 2132 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
7ba24713 | 2133 | if (conn->hdrdgst_en) { |
5bb0b55a MC |
2134 | tcp_conn->hdr_size += sizeof(__u32); |
2135 | if (!tcp_conn->tx_tfm) | |
2136 | tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c", | |
2137 | 0); | |
2138 | if (!tcp_conn->tx_tfm) | |
7ba24713 | 2139 | return -ENOMEM; |
5bb0b55a MC |
2140 | if (!tcp_conn->rx_tfm) |
2141 | tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c", | |
2142 | 0); | |
2143 | if (!tcp_conn->rx_tfm) { | |
2144 | crypto_free_tfm(tcp_conn->tx_tfm); | |
7ba24713 AA |
2145 | return -ENOMEM; |
2146 | } | |
2147 | } else { | |
5bb0b55a MC |
2148 | if (tcp_conn->tx_tfm) |
2149 | crypto_free_tfm(tcp_conn->tx_tfm); | |
2150 | if (tcp_conn->rx_tfm) | |
2151 | crypto_free_tfm(tcp_conn->rx_tfm); | |
7ba24713 AA |
2152 | } |
2153 | break; | |
2154 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 2155 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 | 2156 | if (conn->datadgst_en) { |
5bb0b55a MC |
2157 | if (!tcp_conn->data_tx_tfm) |
2158 | tcp_conn->data_tx_tfm = | |
7ba24713 | 2159 | crypto_alloc_tfm("crc32c", 0); |
5bb0b55a | 2160 | if (!tcp_conn->data_tx_tfm) |
7ba24713 | 2161 | return -ENOMEM; |
5bb0b55a MC |
2162 | if (!tcp_conn->data_rx_tfm) |
2163 | tcp_conn->data_rx_tfm = | |
7ba24713 | 2164 | crypto_alloc_tfm("crc32c", 0); |
5bb0b55a MC |
2165 | if (!tcp_conn->data_rx_tfm) { |
2166 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
7ba24713 AA |
2167 | return -ENOMEM; |
2168 | } | |
2169 | } else { | |
5bb0b55a MC |
2170 | if (tcp_conn->data_tx_tfm) |
2171 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
2172 | if (tcp_conn->data_rx_tfm) | |
2173 | crypto_free_tfm(tcp_conn->data_rx_tfm); | |
7ba24713 | 2174 | } |
5bb0b55a MC |
2175 | tcp_conn->sendpage = conn->datadgst_en ? |
2176 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 | 2177 | break; |
7ba24713 | 2178 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 2179 | sscanf(buf, "%d", &value); |
7ba24713 AA |
2180 | if (session->max_r2t == roundup_pow_of_two(value)) |
2181 | break; | |
2182 | iscsi_r2tpool_free(session); | |
5c75b7fc | 2183 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2184 | if (session->max_r2t & (session->max_r2t - 1)) |
2185 | session->max_r2t = roundup_pow_of_two(session->max_r2t); | |
2186 | if (iscsi_r2tpool_alloc(session)) | |
2187 | return -ENOMEM; | |
2188 | break; | |
7ba24713 | 2189 | default: |
5c75b7fc | 2190 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2191 | } |
2192 | ||
2193 | return 0; | |
2194 | } | |
2195 | ||
2196 | static int | |
5c75b7fc MC |
2197 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
2198 | enum iscsi_param param, char *buf) | |
7b8631b5 | 2199 | { |
7b7232f3 | 2200 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2201 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
fd7255f5 | 2202 | struct inet_sock *inet; |
5c75b7fc MC |
2203 | struct ipv6_pinfo *np; |
2204 | struct sock *sk; | |
2205 | int len; | |
7b8631b5 MC |
2206 | |
2207 | switch(param) { | |
fd7255f5 MC |
2208 | case ISCSI_PARAM_CONN_PORT: |
2209 | mutex_lock(&conn->xmitmutex); | |
5bb0b55a | 2210 | if (!tcp_conn->sock) { |
fd7255f5 MC |
2211 | mutex_unlock(&conn->xmitmutex); |
2212 | return -EINVAL; | |
2213 | } | |
2214 | ||
5bb0b55a | 2215 | inet = inet_sk(tcp_conn->sock->sk); |
5c75b7fc | 2216 | len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport)); |
fd7255f5 | 2217 | mutex_unlock(&conn->xmitmutex); |
8d2860b3 | 2218 | break; |
fd7255f5 MC |
2219 | case ISCSI_PARAM_CONN_ADDRESS: |
2220 | mutex_lock(&conn->xmitmutex); | |
5bb0b55a | 2221 | if (!tcp_conn->sock) { |
fd7255f5 MC |
2222 | mutex_unlock(&conn->xmitmutex); |
2223 | return -EINVAL; | |
2224 | } | |
2225 | ||
5bb0b55a | 2226 | sk = tcp_conn->sock->sk; |
fd7255f5 MC |
2227 | if (sk->sk_family == PF_INET) { |
2228 | inet = inet_sk(sk); | |
2229 | len = sprintf(buf, "%u.%u.%u.%u\n", | |
2230 | NIPQUAD(inet->daddr)); | |
2231 | } else { | |
2232 | np = inet6_sk(sk); | |
2233 | len = sprintf(buf, | |
2234 | "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
2235 | NIP6(np->daddr)); | |
2236 | } | |
2237 | mutex_unlock(&conn->xmitmutex); | |
2238 | break; | |
2239 | default: | |
5c75b7fc | 2240 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
2241 | } |
2242 | ||
2243 | return len; | |
2244 | } | |
2245 | ||
7ba24713 | 2246 | static void |
7b7232f3 | 2247 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 2248 | { |
7b7232f3 | 2249 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2250 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
2251 | |
2252 | stats->txdata_octets = conn->txdata_octets; | |
2253 | stats->rxdata_octets = conn->rxdata_octets; | |
2254 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
2255 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
2256 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
2257 | stats->datain_pdus = conn->datain_pdus_cnt; | |
2258 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
2259 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
2260 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
2261 | stats->custom_length = 3; | |
2262 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 2263 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 2264 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 2265 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
2266 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
2267 | stats->custom[2].value = conn->eh_abort_cnt; | |
2268 | } | |
2269 | ||
5bb0b55a MC |
2270 | static struct iscsi_cls_session * |
2271 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, | |
2272 | struct scsi_transport_template *scsit, | |
2273 | uint32_t initial_cmdsn, uint32_t *hostno) | |
7ba24713 | 2274 | { |
5bb0b55a MC |
2275 | struct iscsi_cls_session *cls_session; |
2276 | struct iscsi_session *session; | |
2277 | uint32_t hn; | |
2278 | int cmd_i; | |
7ba24713 | 2279 | |
5bb0b55a MC |
2280 | cls_session = iscsi_session_setup(iscsit, scsit, |
2281 | sizeof(struct iscsi_tcp_cmd_task), | |
2282 | sizeof(struct iscsi_tcp_mgmt_task), | |
2283 | initial_cmdsn, &hn); | |
2284 | if (!cls_session) | |
2285 | return NULL; | |
2286 | *hostno = hn; | |
7ba24713 | 2287 | |
5bb0b55a MC |
2288 | session = class_to_transport_session(cls_session); |
2289 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2290 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
2291 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2292 | ||
2293 | ctask->hdr = &tcp_ctask->hdr; | |
2294 | } | |
2295 | ||
2296 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
2297 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
2298 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
2299 | ||
2300 | mtask->hdr = &tcp_mtask->hdr; | |
2301 | } | |
2302 | ||
2303 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) | |
2304 | goto r2tpool_alloc_fail; | |
2305 | ||
2306 | return cls_session; | |
2307 | ||
2308 | r2tpool_alloc_fail: | |
2309 | iscsi_session_teardown(cls_session); | |
2310 | return NULL; | |
2311 | } | |
2312 | ||
2313 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
2314 | { | |
5bb0b55a MC |
2315 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
2316 | iscsi_session_teardown(cls_session); | |
7ba24713 AA |
2317 | } |
2318 | ||
5bb0b55a | 2319 | static struct scsi_host_template iscsi_sht = { |
e0ecae8d MC |
2320 | .name = "iSCSI Initiator over TCP/IP, v" |
2321 | ISCSI_TCP_VERSION, | |
5bb0b55a MC |
2322 | .queuecommand = iscsi_queuecommand, |
2323 | .change_queue_depth = iscsi_change_queue_depth, | |
2324 | .can_queue = ISCSI_XMIT_CMDS_MAX - 1, | |
2325 | .sg_tablesize = ISCSI_SG_TABLESIZE, | |
2326 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, | |
2327 | .eh_abort_handler = iscsi_eh_abort, | |
2328 | .eh_host_reset_handler = iscsi_eh_host_reset, | |
2329 | .use_clustering = DISABLE_CLUSTERING, | |
2330 | .proc_name = "iscsi_tcp", | |
2331 | .this_id = -1, | |
2332 | }; | |
2333 | ||
7ba24713 AA |
2334 | static struct iscsi_transport iscsi_tcp_transport = { |
2335 | .owner = THIS_MODULE, | |
2336 | .name = "tcp", | |
2337 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
2338 | | CAP_DATADGST, | |
fd7255f5 MC |
2339 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
2340 | ISCSI_MAX_XMIT_DLENGTH | | |
2341 | ISCSI_HDRDGST_EN | | |
2342 | ISCSI_DATADGST_EN | | |
2343 | ISCSI_INITIAL_R2T_EN | | |
2344 | ISCSI_MAX_R2T | | |
2345 | ISCSI_IMM_DATA_EN | | |
2346 | ISCSI_FIRST_BURST | | |
2347 | ISCSI_MAX_BURST | | |
2348 | ISCSI_PDU_INORDER_EN | | |
2349 | ISCSI_DATASEQ_INORDER_EN | | |
2350 | ISCSI_ERL | | |
2351 | ISCSI_CONN_PORT | | |
8d2860b3 | 2352 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
2353 | ISCSI_EXP_STATSN | |
2354 | ISCSI_PERSISTENT_PORT | | |
2355 | ISCSI_PERSISTENT_ADDRESS | | |
2356 | ISCSI_TARGET_NAME | | |
2357 | ISCSI_TPGT, | |
7ba24713 | 2358 | .host_template = &iscsi_sht, |
7b8631b5 | 2359 | .conndata_size = sizeof(struct iscsi_conn), |
7ba24713 AA |
2360 | .max_conn = 1, |
2361 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, | |
5bb0b55a MC |
2362 | /* session management */ |
2363 | .create_session = iscsi_tcp_session_create, | |
2364 | .destroy_session = iscsi_tcp_session_destroy, | |
2365 | /* connection management */ | |
2366 | .create_conn = iscsi_tcp_conn_create, | |
2367 | .bind_conn = iscsi_tcp_conn_bind, | |
2368 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 2369 | .set_param = iscsi_conn_set_param, |
5c75b7fc | 2370 | .get_conn_param = iscsi_tcp_conn_get_param, |
7b8631b5 | 2371 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 2372 | .start_conn = iscsi_conn_start, |
1c83469d | 2373 | .stop_conn = iscsi_tcp_conn_stop, |
5bb0b55a | 2374 | /* IO */ |
7ba24713 AA |
2375 | .send_pdu = iscsi_conn_send_pdu, |
2376 | .get_stats = iscsi_conn_get_stats, | |
5bb0b55a MC |
2377 | .init_cmd_task = iscsi_tcp_cmd_init, |
2378 | .init_mgmt_task = iscsi_tcp_mgmt_init, | |
2379 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, | |
2380 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2381 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2382 | /* recovery */ | |
30a6c652 | 2383 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
2384 | }; |
2385 | ||
2386 | static int __init | |
2387 | iscsi_tcp_init(void) | |
2388 | { | |
7ba24713 | 2389 | if (iscsi_max_lun < 1) { |
be2df72e OG |
2390 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
2391 | iscsi_max_lun); | |
7ba24713 AA |
2392 | return -EINVAL; |
2393 | } | |
2394 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
2395 | ||
7b8631b5 | 2396 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
ffbfe925 | 2397 | return -ENODEV; |
7ba24713 | 2398 | |
7b8631b5 | 2399 | return 0; |
7ba24713 AA |
2400 | } |
2401 | ||
2402 | static void __exit | |
2403 | iscsi_tcp_exit(void) | |
2404 | { | |
2405 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
7ba24713 AA |
2406 | } |
2407 | ||
2408 | module_init(iscsi_tcp_init); | |
2409 | module_exit(iscsi_tcp_exit); |