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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> | |
37 | #include <net/tcp.h> | |
38 | #include <scsi/scsi_cmnd.h> | |
7ba24713 AA |
39 | #include <scsi/scsi_host.h> |
40 | #include <scsi/scsi.h> | |
41 | #include <scsi/scsi_transport_iscsi.h> | |
42 | ||
43 | #include "iscsi_tcp.h" | |
44 | ||
45 | MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
46 | "Alex Aizman <itn780@yahoo.com>"); | |
47 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
48 | MODULE_LICENSE("GPL"); | |
7ba24713 | 49 | /* #define DEBUG_TCP */ |
7ba24713 AA |
50 | #define DEBUG_ASSERT |
51 | ||
52 | #ifdef DEBUG_TCP | |
5bb0b55a | 53 | #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) |
7ba24713 AA |
54 | #else |
55 | #define debug_tcp(fmt...) | |
56 | #endif | |
57 | ||
7ba24713 AA |
58 | #ifndef DEBUG_ASSERT |
59 | #ifdef BUG_ON | |
60 | #undef BUG_ON | |
61 | #endif | |
62 | #define BUG_ON(expr) | |
63 | #endif | |
64 | ||
7ba24713 AA |
65 | static unsigned int iscsi_max_lun = 512; |
66 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
67 | ||
7ba24713 AA |
68 | static inline void |
69 | iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size) | |
70 | { | |
7cae5159 MC |
71 | ibuf->sg.page = virt_to_page(vbuf); |
72 | ibuf->sg.offset = offset_in_page(vbuf); | |
7ba24713 AA |
73 | ibuf->sg.length = size; |
74 | ibuf->sent = 0; | |
7cae5159 | 75 | ibuf->use_sendmsg = 1; |
7ba24713 AA |
76 | } |
77 | ||
78 | static inline void | |
79 | iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg) | |
80 | { | |
7cae5159 MC |
81 | ibuf->sg.page = sg->page; |
82 | ibuf->sg.offset = sg->offset; | |
83 | ibuf->sg.length = sg->length; | |
7ba24713 AA |
84 | /* |
85 | * Fastpath: sg element fits into single page | |
86 | */ | |
a1e80c20 | 87 | if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page)) |
7cae5159 MC |
88 | ibuf->use_sendmsg = 0; |
89 | else | |
90 | ibuf->use_sendmsg = 1; | |
7ba24713 AA |
91 | ibuf->sent = 0; |
92 | } | |
93 | ||
94 | static inline int | |
95 | iscsi_buf_left(struct iscsi_buf *ibuf) | |
96 | { | |
97 | int rc; | |
98 | ||
99 | rc = ibuf->sg.length - ibuf->sent; | |
100 | BUG_ON(rc < 0); | |
101 | return rc; | |
102 | } | |
103 | ||
104 | static inline void | |
af973481 MC |
105 | iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, |
106 | u8* crc) | |
7ba24713 | 107 | { |
5bb0b55a | 108 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 109 | |
c9802cd9 | 110 | crypto_hash_digest(&tcp_conn->tx_hash, &buf->sg, buf->sg.length, crc); |
218432c6 | 111 | buf->sg.length += sizeof(u32); |
7ba24713 AA |
112 | } |
113 | ||
114 | static inline int | |
5bb0b55a | 115 | iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 116 | { |
5bb0b55a | 117 | struct sk_buff *skb = tcp_conn->in.skb; |
7ba24713 | 118 | |
5bb0b55a | 119 | tcp_conn->in.zero_copy_hdr = 0; |
7ba24713 | 120 | |
5bb0b55a MC |
121 | if (tcp_conn->in.copy >= tcp_conn->hdr_size && |
122 | tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) { | |
7ba24713 AA |
123 | /* |
124 | * Zero-copy PDU Header: using connection context | |
125 | * to store header pointer. | |
126 | */ | |
127 | if (skb_shinfo(skb)->frag_list == NULL && | |
5bb0b55a MC |
128 | !skb_shinfo(skb)->nr_frags) { |
129 | tcp_conn->in.hdr = (struct iscsi_hdr *) | |
130 | ((char*)skb->data + tcp_conn->in.offset); | |
131 | tcp_conn->in.zero_copy_hdr = 1; | |
132 | } else { | |
7ba24713 AA |
133 | /* ignoring return code since we checked |
134 | * in.copy before */ | |
5bb0b55a MC |
135 | skb_copy_bits(skb, tcp_conn->in.offset, |
136 | &tcp_conn->hdr, tcp_conn->hdr_size); | |
137 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
7ba24713 | 138 | } |
5bb0b55a MC |
139 | tcp_conn->in.offset += tcp_conn->hdr_size; |
140 | tcp_conn->in.copy -= tcp_conn->hdr_size; | |
7ba24713 AA |
141 | } else { |
142 | int hdr_remains; | |
143 | int copylen; | |
144 | ||
145 | /* | |
146 | * PDU header scattered across SKB's, | |
147 | * copying it... This'll happen quite rarely. | |
148 | */ | |
149 | ||
5bb0b55a MC |
150 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) |
151 | tcp_conn->in.hdr_offset = 0; | |
7ba24713 | 152 | |
5bb0b55a | 153 | hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset; |
7ba24713 AA |
154 | BUG_ON(hdr_remains <= 0); |
155 | ||
5bb0b55a MC |
156 | copylen = min(tcp_conn->in.copy, hdr_remains); |
157 | skb_copy_bits(skb, tcp_conn->in.offset, | |
158 | (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset, | |
159 | copylen); | |
7ba24713 AA |
160 | |
161 | debug_tcp("PDU gather offset %d bytes %d in.offset %d " | |
5bb0b55a MC |
162 | "in.copy %d\n", tcp_conn->in.hdr_offset, copylen, |
163 | tcp_conn->in.offset, tcp_conn->in.copy); | |
7ba24713 | 164 | |
5bb0b55a MC |
165 | tcp_conn->in.offset += copylen; |
166 | tcp_conn->in.copy -= copylen; | |
7ba24713 | 167 | if (copylen < hdr_remains) { |
5bb0b55a MC |
168 | tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER; |
169 | tcp_conn->in.hdr_offset += copylen; | |
7ba24713 AA |
170 | return -EAGAIN; |
171 | } | |
5bb0b55a MC |
172 | tcp_conn->in.hdr = &tcp_conn->hdr; |
173 | tcp_conn->discontiguous_hdr_cnt++; | |
174 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
175 | } |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
30a6c652 MC |
180 | /* |
181 | * must be called with session lock | |
182 | */ | |
183 | static void | |
b6c395ed | 184 | iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 185 | { |
5bb0b55a | 186 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
b6c395ed | 187 | struct iscsi_r2t_info *r2t; |
30a6c652 | 188 | struct scsi_cmnd *sc; |
7ba24713 | 189 | |
b6c395ed MC |
190 | /* flush ctask's r2t queues */ |
191 | while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { | |
192 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
193 | sizeof(void*)); | |
194 | debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n"); | |
195 | } | |
196 | ||
30a6c652 MC |
197 | sc = ctask->sc; |
198 | if (unlikely(!sc)) | |
7ba24713 | 199 | return; |
30a6c652 | 200 | |
5bb0b55a MC |
201 | tcp_ctask->xmstate = XMSTATE_IDLE; |
202 | tcp_ctask->r2t = NULL; | |
7ba24713 AA |
203 | } |
204 | ||
205 | /** | |
206 | * iscsi_data_rsp - SCSI Data-In Response processing | |
207 | * @conn: iscsi connection | |
208 | * @ctask: scsi command task | |
209 | **/ | |
210 | static int | |
211 | iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
212 | { | |
5bb0b55a MC |
213 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
214 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
215 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
7ba24713 | 216 | struct iscsi_session *session = conn->session; |
857ae0bd | 217 | struct scsi_cmnd *sc = ctask->sc; |
7ba24713 AA |
218 | int datasn = be32_to_cpu(rhdr->datasn); |
219 | ||
77a23c21 | 220 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7ba24713 AA |
221 | /* |
222 | * setup Data-In byte counter (gets decremented..) | |
223 | */ | |
5bb0b55a | 224 | ctask->data_count = tcp_conn->in.datalen; |
7ba24713 | 225 | |
5bb0b55a | 226 | if (tcp_conn->in.datalen == 0) |
7ba24713 AA |
227 | return 0; |
228 | ||
d473cc7f MC |
229 | if (tcp_ctask->exp_datasn != datasn) { |
230 | debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->datasn(%d)\n", | |
231 | __FUNCTION__, tcp_ctask->exp_datasn, datasn); | |
7ba24713 | 232 | return ISCSI_ERR_DATASN; |
d473cc7f | 233 | } |
7ba24713 | 234 | |
d473cc7f | 235 | tcp_ctask->exp_datasn++; |
7ba24713 | 236 | |
5bb0b55a | 237 | tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); |
857ae0bd MC |
238 | if (tcp_ctask->data_offset + tcp_conn->in.datalen > sc->request_bufflen) { |
239 | debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n", | |
240 | __FUNCTION__, tcp_ctask->data_offset, | |
241 | tcp_conn->in.datalen, sc->request_bufflen); | |
7ba24713 | 242 | return ISCSI_ERR_DATA_OFFSET; |
857ae0bd | 243 | } |
7ba24713 AA |
244 | |
245 | if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
7ba24713 | 246 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
bf310b8f | 247 | if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) { |
7ba24713 AA |
248 | int res_count = be32_to_cpu(rhdr->residual_count); |
249 | ||
250 | if (res_count > 0 && | |
251 | res_count <= sc->request_bufflen) { | |
252 | sc->resid = res_count; | |
253 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
254 | } else | |
255 | sc->result = (DID_BAD_TARGET << 16) | | |
256 | rhdr->cmd_status; | |
bf310b8f | 257 | } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) { |
7ba24713 AA |
258 | sc->resid = be32_to_cpu(rhdr->residual_count); |
259 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
260 | } else | |
261 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
262 | } | |
263 | ||
264 | conn->datain_pdus_cnt++; | |
265 | return 0; | |
266 | } | |
267 | ||
268 | /** | |
269 | * iscsi_solicit_data_init - initialize first Data-Out | |
270 | * @conn: iscsi connection | |
271 | * @ctask: scsi command task | |
272 | * @r2t: R2T info | |
273 | * | |
274 | * Notes: | |
275 | * Initialize first Data-Out within this R2T sequence and finds | |
276 | * proper data_offset within this SCSI command. | |
277 | * | |
278 | * This function is called with connection lock taken. | |
279 | **/ | |
280 | static void | |
281 | iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
282 | struct iscsi_r2t_info *r2t) | |
283 | { | |
284 | struct iscsi_data *hdr; | |
7ba24713 AA |
285 | struct scsi_cmnd *sc = ctask->sc; |
286 | ||
ffbfe925 | 287 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
288 | memset(hdr, 0, sizeof(struct iscsi_data)); |
289 | hdr->ttt = r2t->ttt; | |
290 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
291 | r2t->solicit_datasn++; | |
292 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
293 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
294 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
295 | hdr->exp_statsn = r2t->exp_statsn; |
296 | hdr->offset = cpu_to_be32(r2t->data_offset); | |
297 | if (r2t->data_length > conn->max_xmit_dlength) { | |
298 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
299 | r2t->data_count = conn->max_xmit_dlength; | |
300 | hdr->flags = 0; | |
301 | } else { | |
302 | hton24(hdr->dlength, r2t->data_length); | |
303 | r2t->data_count = r2t->data_length; | |
304 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
305 | } | |
306 | conn->dataout_pdus_cnt++; | |
307 | ||
308 | r2t->sent = 0; | |
309 | ||
6e458cc9 | 310 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 311 | sizeof(struct iscsi_hdr)); |
7ba24713 | 312 | |
7ba24713 AA |
313 | if (sc->use_sg) { |
314 | int i, sg_count = 0; | |
315 | struct scatterlist *sg = sc->request_buffer; | |
316 | ||
317 | r2t->sg = NULL; | |
318 | for (i = 0; i < sc->use_sg; i++, sg += 1) { | |
319 | /* FIXME: prefetch ? */ | |
320 | if (sg_count + sg->length > r2t->data_offset) { | |
321 | int page_offset; | |
322 | ||
323 | /* sg page found! */ | |
324 | ||
325 | /* offset within this page */ | |
326 | page_offset = r2t->data_offset - sg_count; | |
327 | ||
328 | /* fill in this buffer */ | |
329 | iscsi_buf_init_sg(&r2t->sendbuf, sg); | |
330 | r2t->sendbuf.sg.offset += page_offset; | |
331 | r2t->sendbuf.sg.length -= page_offset; | |
332 | ||
333 | /* xmit logic will continue with next one */ | |
334 | r2t->sg = sg + 1; | |
335 | break; | |
336 | } | |
337 | sg_count += sg->length; | |
338 | } | |
339 | BUG_ON(r2t->sg == NULL); | |
62f38300 MC |
340 | } else { |
341 | iscsi_buf_init_iov(&r2t->sendbuf, | |
7ba24713 AA |
342 | (char*)sc->request_buffer + r2t->data_offset, |
343 | r2t->data_count); | |
62f38300 MC |
344 | r2t->sg = NULL; |
345 | } | |
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 | ||
98a9416a MC |
364 | if (tcp_conn->in.datalen) { |
365 | printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n", | |
366 | tcp_conn->in.datalen); | |
7ba24713 | 367 | return ISCSI_ERR_DATALEN; |
98a9416a | 368 | } |
7ba24713 | 369 | |
d473cc7f MC |
370 | if (tcp_ctask->exp_datasn != r2tsn){ |
371 | debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n", | |
372 | __FUNCTION__, tcp_ctask->exp_datasn, r2tsn); | |
7ba24713 | 373 | return ISCSI_ERR_R2TSN; |
d473cc7f | 374 | } |
7ba24713 | 375 | |
7ba24713 AA |
376 | /* fill-in new R2T associated with the task */ |
377 | spin_lock(&session->lock); | |
77a23c21 MC |
378 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
379 | ||
7ba24713 AA |
380 | if (!ctask->sc || ctask->mtask || |
381 | session->state != ISCSI_STATE_LOGGED_IN) { | |
382 | printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " | |
383 | "recovery...\n", ctask->itt); | |
384 | spin_unlock(&session->lock); | |
385 | return 0; | |
386 | } | |
b6c395ed | 387 | |
5bb0b55a | 388 | rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 AA |
389 | BUG_ON(!rc); |
390 | ||
391 | r2t->exp_statsn = rhdr->statsn; | |
392 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
98a9416a MC |
393 | if (r2t->data_length == 0) { |
394 | printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n"); | |
7ba24713 AA |
395 | spin_unlock(&session->lock); |
396 | return ISCSI_ERR_DATALEN; | |
397 | } | |
398 | ||
98a9416a MC |
399 | if (r2t->data_length > session->max_burst) |
400 | debug_scsi("invalid R2T with data len %u and max burst %u." | |
401 | "Attempting to execute request.\n", | |
402 | r2t->data_length, session->max_burst); | |
403 | ||
7ba24713 | 404 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); |
857ae0bd | 405 | if (r2t->data_offset + r2t->data_length > ctask->sc->request_bufflen) { |
7ba24713 | 406 | spin_unlock(&session->lock); |
98a9416a MC |
407 | printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at " |
408 | "offset %u and total length %d\n", r2t->data_length, | |
857ae0bd | 409 | r2t->data_offset, ctask->sc->request_bufflen); |
7ba24713 AA |
410 | return ISCSI_ERR_DATALEN; |
411 | } | |
412 | ||
413 | r2t->ttt = rhdr->ttt; /* no flip */ | |
414 | r2t->solicit_datasn = 0; | |
415 | ||
416 | iscsi_solicit_data_init(conn, ctask, r2t); | |
417 | ||
d473cc7f | 418 | tcp_ctask->exp_datasn = r2tsn + 1; |
5bb0b55a | 419 | __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); |
218432c6 | 420 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR_INIT; |
b6c395ed | 421 | list_move_tail(&ctask->running, &conn->xmitqueue); |
7ba24713 | 422 | |
55e3299d | 423 | scsi_queue_work(session->host, &conn->xmitwork); |
7ba24713 AA |
424 | conn->r2t_pdus_cnt++; |
425 | spin_unlock(&session->lock); | |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
430 | static int | |
5bb0b55a | 431 | iscsi_tcp_hdr_recv(struct iscsi_conn *conn) |
7ba24713 | 432 | { |
5bb0b55a | 433 | int rc = 0, opcode, ahslen; |
7ba24713 | 434 | struct iscsi_hdr *hdr; |
7ba24713 | 435 | struct iscsi_session *session = conn->session; |
5bb0b55a MC |
436 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
437 | uint32_t cdgst, rdgst = 0, itt; | |
7ba24713 | 438 | |
5bb0b55a | 439 | hdr = tcp_conn->in.hdr; |
7ba24713 AA |
440 | |
441 | /* verify PDU length */ | |
5bb0b55a MC |
442 | tcp_conn->in.datalen = ntoh24(hdr->dlength); |
443 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
7ba24713 | 444 | printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", |
5bb0b55a | 445 | tcp_conn->in.datalen, conn->max_recv_dlength); |
7ba24713 AA |
446 | return ISCSI_ERR_DATALEN; |
447 | } | |
5bb0b55a | 448 | tcp_conn->data_copied = 0; |
7ba24713 AA |
449 | |
450 | /* read AHS */ | |
5bb0b55a MC |
451 | ahslen = hdr->hlength << 2; |
452 | tcp_conn->in.offset += ahslen; | |
453 | tcp_conn->in.copy -= ahslen; | |
454 | if (tcp_conn->in.copy < 0) { | |
7ba24713 | 455 | printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " |
5bb0b55a | 456 | "%d bytes\n", ahslen); |
7ba24713 AA |
457 | return ISCSI_ERR_AHSLEN; |
458 | } | |
459 | ||
460 | /* calculate read padding */ | |
5bb0b55a MC |
461 | tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1); |
462 | if (tcp_conn->in.padding) { | |
463 | tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding; | |
464 | debug_scsi("read padding %d bytes\n", tcp_conn->in.padding); | |
7ba24713 AA |
465 | } |
466 | ||
467 | if (conn->hdrdgst_en) { | |
468 | struct scatterlist sg; | |
469 | ||
470 | sg_init_one(&sg, (u8 *)hdr, | |
5bb0b55a | 471 | sizeof(struct iscsi_hdr) + ahslen); |
c9802cd9 JB |
472 | crypto_hash_digest(&tcp_conn->rx_hash, &sg, sg.length, |
473 | (u8 *)&cdgst); | |
7ba24713 | 474 | rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + |
5bb0b55a | 475 | ahslen); |
8a47cd34 | 476 | if (cdgst != rdgst) { |
5bb0b55a MC |
477 | printk(KERN_ERR "iscsi_tcp: hdrdgst error " |
478 | "recv 0x%x calc 0x%x\n", rdgst, cdgst); | |
8a47cd34 MC |
479 | return ISCSI_ERR_HDR_DGST; |
480 | } | |
7ba24713 AA |
481 | } |
482 | ||
5bb0b55a | 483 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
7ba24713 | 484 | /* verify itt (itt encoding: age+cid+itt) */ |
5bb0b55a MC |
485 | rc = iscsi_verify_itt(conn, hdr, &itt); |
486 | if (rc == ISCSI_ERR_NO_SCSI_CMD) { | |
487 | tcp_conn->in.datalen = 0; /* force drop */ | |
488 | return 0; | |
489 | } else if (rc) | |
490 | return rc; | |
7ba24713 AA |
491 | |
492 | debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", | |
5bb0b55a MC |
493 | opcode, tcp_conn->in.offset, tcp_conn->in.copy, |
494 | ahslen, tcp_conn->in.datalen); | |
7ba24713 | 495 | |
5bb0b55a MC |
496 | switch(opcode) { |
497 | case ISCSI_OP_SCSI_DATA_IN: | |
498 | tcp_conn->in.ctask = session->cmds[itt]; | |
499 | rc = iscsi_data_rsp(conn, tcp_conn->in.ctask); | |
275fd7d1 MC |
500 | if (rc) |
501 | return rc; | |
5bb0b55a MC |
502 | /* fall through */ |
503 | case ISCSI_OP_SCSI_CMD_RSP: | |
504 | tcp_conn->in.ctask = session->cmds[itt]; | |
505 | if (tcp_conn->in.datalen) | |
506 | goto copy_hdr; | |
7ba24713 | 507 | |
5bb0b55a | 508 | spin_lock(&session->lock); |
5bb0b55a MC |
509 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); |
510 | spin_unlock(&session->lock); | |
511 | break; | |
512 | case ISCSI_OP_R2T: | |
513 | tcp_conn->in.ctask = session->cmds[itt]; | |
514 | if (ahslen) | |
515 | rc = ISCSI_ERR_AHSLEN; | |
516 | else if (tcp_conn->in.ctask->sc->sc_data_direction == | |
517 | DMA_TO_DEVICE) | |
518 | rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); | |
519 | else | |
520 | rc = ISCSI_ERR_PROTO; | |
521 | break; | |
522 | case ISCSI_OP_LOGIN_RSP: | |
523 | case ISCSI_OP_TEXT_RSP: | |
5bb0b55a MC |
524 | case ISCSI_OP_REJECT: |
525 | case ISCSI_OP_ASYNC_EVENT: | |
c8dc1e52 MC |
526 | /* |
527 | * It is possible that we could get a PDU with a buffer larger | |
528 | * than 8K, but there are no targets that currently do this. | |
529 | * For now we fail until we find a vendor that needs it | |
530 | */ | |
bf32ed33 | 531 | if (ISCSI_DEF_MAX_RECV_SEG_LEN < |
c8dc1e52 MC |
532 | tcp_conn->in.datalen) { |
533 | printk(KERN_ERR "iscsi_tcp: received buffer of len %u " | |
534 | "but conn buffer is only %u (opcode %0x)\n", | |
535 | tcp_conn->in.datalen, | |
bf32ed33 | 536 | ISCSI_DEF_MAX_RECV_SEG_LEN, opcode); |
c8dc1e52 MC |
537 | rc = ISCSI_ERR_PROTO; |
538 | break; | |
539 | } | |
540 | ||
5bb0b55a MC |
541 | if (tcp_conn->in.datalen) |
542 | goto copy_hdr; | |
543 | /* fall through */ | |
c8dc1e52 MC |
544 | case ISCSI_OP_LOGOUT_RSP: |
545 | case ISCSI_OP_NOOP_IN: | |
5bb0b55a MC |
546 | case ISCSI_OP_SCSI_TMFUNC_RSP: |
547 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
548 | break; | |
549 | default: | |
550 | rc = ISCSI_ERR_BAD_OPCODE; | |
551 | break; | |
552 | } | |
7ba24713 AA |
553 | |
554 | return rc; | |
5bb0b55a MC |
555 | |
556 | copy_hdr: | |
557 | /* | |
558 | * if we did zero copy for the header but we will need multiple | |
559 | * skbs to complete the command then we have to copy the header | |
560 | * for later use | |
561 | */ | |
275fd7d1 | 562 | if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <= |
5bb0b55a MC |
563 | (tcp_conn->in.datalen + tcp_conn->in.padding + |
564 | (conn->datadgst_en ? 4 : 0))) { | |
565 | debug_tcp("Copying header for later use. in.copy %d in.datalen" | |
566 | " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); | |
567 | memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, | |
568 | sizeof(struct iscsi_hdr)); | |
569 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
570 | tcp_conn->in.zero_copy_hdr = 0; | |
571 | } | |
572 | return 0; | |
7ba24713 AA |
573 | } |
574 | ||
575 | /** | |
576 | * iscsi_ctask_copy - copy skb bits to the destanation cmd task | |
5bb0b55a | 577 | * @conn: iscsi tcp connection |
7ba24713 AA |
578 | * @ctask: scsi command task |
579 | * @buf: buffer to copy to | |
580 | * @buf_size: size of buffer | |
581 | * @offset: offset within the buffer | |
582 | * | |
583 | * Notes: | |
584 | * The function calls skb_copy_bits() and updates per-connection and | |
585 | * per-cmd byte counters. | |
586 | * | |
587 | * Read counters (in bytes): | |
588 | * | |
589 | * conn->in.offset offset within in progress SKB | |
590 | * conn->in.copy left to copy from in progress SKB | |
591 | * including padding | |
592 | * conn->in.copied copied already from in progress SKB | |
593 | * conn->data_copied copied already from in progress buffer | |
594 | * ctask->sent total bytes sent up to the MidLayer | |
595 | * ctask->data_count left to copy from in progress Data-In | |
596 | * buf_left left to copy from in progress buffer | |
597 | **/ | |
598 | static inline int | |
5bb0b55a | 599 | iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, |
7ba24713 AA |
600 | void *buf, int buf_size, int offset) |
601 | { | |
5bb0b55a MC |
602 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
603 | int buf_left = buf_size - (tcp_conn->data_copied + offset); | |
857ae0bd | 604 | unsigned size = min(tcp_conn->in.copy, buf_left); |
7ba24713 AA |
605 | int rc; |
606 | ||
607 | size = min(size, ctask->data_count); | |
608 | ||
609 | debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 610 | size, tcp_conn->in.offset, tcp_conn->in.copied); |
7ba24713 AA |
611 | |
612 | BUG_ON(size <= 0); | |
857ae0bd | 613 | BUG_ON(tcp_ctask->sent + size > ctask->sc->request_bufflen); |
7ba24713 | 614 | |
5bb0b55a MC |
615 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
616 | (char*)buf + (offset + tcp_conn->data_copied), size); | |
7ba24713 AA |
617 | /* must fit into skb->len */ |
618 | BUG_ON(rc); | |
619 | ||
5bb0b55a MC |
620 | tcp_conn->in.offset += size; |
621 | tcp_conn->in.copy -= size; | |
622 | tcp_conn->in.copied += size; | |
623 | tcp_conn->data_copied += size; | |
624 | tcp_ctask->sent += size; | |
7ba24713 AA |
625 | ctask->data_count -= size; |
626 | ||
5bb0b55a | 627 | BUG_ON(tcp_conn->in.copy < 0); |
7ba24713 AA |
628 | BUG_ON(ctask->data_count < 0); |
629 | ||
5bb0b55a | 630 | if (buf_size != (tcp_conn->data_copied + offset)) { |
7ba24713 | 631 | if (!ctask->data_count) { |
5bb0b55a | 632 | BUG_ON(buf_size - tcp_conn->data_copied < 0); |
7ba24713 | 633 | /* done with this PDU */ |
5bb0b55a | 634 | return buf_size - tcp_conn->data_copied; |
7ba24713 AA |
635 | } |
636 | return -EAGAIN; | |
637 | } | |
638 | ||
639 | /* done with this buffer or with both - PDU and buffer */ | |
5bb0b55a | 640 | tcp_conn->data_copied = 0; |
7ba24713 AA |
641 | return 0; |
642 | } | |
643 | ||
644 | /** | |
645 | * iscsi_tcp_copy - copy skb bits to the destanation buffer | |
5bb0b55a | 646 | * @conn: iscsi tcp connection |
7ba24713 AA |
647 | * |
648 | * Notes: | |
649 | * The function calls skb_copy_bits() and updates per-connection | |
650 | * byte counters. | |
651 | **/ | |
652 | static inline int | |
ca518684 | 653 | iscsi_tcp_copy(struct iscsi_conn *conn, int buf_size) |
7ba24713 | 654 | { |
c8dc1e52 | 655 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5bb0b55a MC |
656 | int buf_left = buf_size - tcp_conn->data_copied; |
657 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
658 | int rc; |
659 | ||
660 | debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 661 | size, tcp_conn->in.offset, tcp_conn->data_copied); |
7ba24713 AA |
662 | BUG_ON(size <= 0); |
663 | ||
5bb0b55a | 664 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
c8dc1e52 | 665 | (char*)conn->data + tcp_conn->data_copied, size); |
7ba24713 AA |
666 | BUG_ON(rc); |
667 | ||
5bb0b55a MC |
668 | tcp_conn->in.offset += size; |
669 | tcp_conn->in.copy -= size; | |
670 | tcp_conn->in.copied += size; | |
671 | tcp_conn->data_copied += size; | |
7ba24713 | 672 | |
5bb0b55a | 673 | if (buf_size != tcp_conn->data_copied) |
7ba24713 AA |
674 | return -EAGAIN; |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
679 | static inline void | |
c9802cd9 | 680 | partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg, |
62f38300 | 681 | int offset, int length) |
7ba24713 AA |
682 | { |
683 | struct scatterlist temp; | |
684 | ||
685 | memcpy(&temp, sg, sizeof(struct scatterlist)); | |
686 | temp.offset = offset; | |
687 | temp.length = length; | |
c9802cd9 | 688 | crypto_hash_update(desc, &temp, length); |
7ba24713 AA |
689 | } |
690 | ||
f6cfba1d | 691 | static void |
5bb0b55a | 692 | iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) |
f6cfba1d MC |
693 | { |
694 | struct scatterlist tmp; | |
695 | ||
696 | sg_init_one(&tmp, buf, len); | |
c9802cd9 | 697 | crypto_hash_update(&tcp_conn->rx_hash, &tmp, len); |
f6cfba1d MC |
698 | } |
699 | ||
7ba24713 AA |
700 | static int iscsi_scsi_data_in(struct iscsi_conn *conn) |
701 | { | |
5bb0b55a MC |
702 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
703 | struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; | |
704 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 705 | struct scsi_cmnd *sc = ctask->sc; |
f6cfba1d | 706 | struct scatterlist *sg; |
7ba24713 AA |
707 | int i, offset, rc = 0; |
708 | ||
709 | BUG_ON((void*)ctask != sc->SCp.ptr); | |
710 | ||
711 | /* | |
712 | * copying Data-In into the Scsi_Cmnd | |
713 | */ | |
714 | if (!sc->use_sg) { | |
715 | i = ctask->data_count; | |
5bb0b55a MC |
716 | rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, |
717 | sc->request_bufflen, | |
718 | tcp_ctask->data_offset); | |
7ba24713 AA |
719 | if (rc == -EAGAIN) |
720 | return rc; | |
42f72aa9 | 721 | if (conn->datadgst_en) |
5bb0b55a MC |
722 | iscsi_recv_digest_update(tcp_conn, sc->request_buffer, |
723 | i); | |
7ba24713 AA |
724 | rc = 0; |
725 | goto done; | |
726 | } | |
727 | ||
5bb0b55a | 728 | offset = tcp_ctask->data_offset; |
7ba24713 AA |
729 | sg = sc->request_buffer; |
730 | ||
5bb0b55a MC |
731 | if (tcp_ctask->data_offset) |
732 | for (i = 0; i < tcp_ctask->sg_count; i++) | |
7ba24713 AA |
733 | offset -= sg[i].length; |
734 | /* we've passed through partial sg*/ | |
735 | if (offset < 0) | |
736 | offset = 0; | |
737 | ||
5bb0b55a | 738 | for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { |
7ba24713 AA |
739 | char *dest; |
740 | ||
741 | dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); | |
5bb0b55a | 742 | rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, |
7ba24713 AA |
743 | sg[i].length, offset); |
744 | kunmap_atomic(dest, KM_SOFTIRQ0); | |
745 | if (rc == -EAGAIN) | |
746 | /* continue with the next SKB/PDU */ | |
747 | return rc; | |
748 | if (!rc) { | |
749 | if (conn->datadgst_en) { | |
750 | if (!offset) | |
dc64ddf4 | 751 | crypto_hash_update( |
c9802cd9 | 752 | &tcp_conn->rx_hash, |
c959e1c2 | 753 | &sg[i], sg[i].length); |
7ba24713 | 754 | else |
62f38300 | 755 | partial_sg_digest_update( |
c9802cd9 | 756 | &tcp_conn->rx_hash, |
5bb0b55a | 757 | &sg[i], |
7ba24713 AA |
758 | sg[i].offset + offset, |
759 | sg[i].length - offset); | |
760 | } | |
761 | offset = 0; | |
5bb0b55a | 762 | tcp_ctask->sg_count++; |
7ba24713 AA |
763 | } |
764 | ||
765 | if (!ctask->data_count) { | |
766 | if (rc && conn->datadgst_en) | |
767 | /* | |
768 | * data-in is complete, but buffer not... | |
769 | */ | |
c9802cd9 JB |
770 | partial_sg_digest_update(&tcp_conn->rx_hash, |
771 | &sg[i], | |
772 | sg[i].offset, | |
773 | sg[i].length-rc); | |
7ba24713 AA |
774 | rc = 0; |
775 | break; | |
776 | } | |
777 | ||
5bb0b55a | 778 | if (!tcp_conn->in.copy) |
7ba24713 AA |
779 | return -EAGAIN; |
780 | } | |
781 | BUG_ON(ctask->data_count); | |
782 | ||
783 | done: | |
784 | /* check for non-exceptional status */ | |
5bb0b55a | 785 | if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { |
b6c395ed MC |
786 | debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n", |
787 | (long)sc, sc->result, ctask->itt, | |
788 | tcp_conn->in.hdr->flags); | |
5bb0b55a | 789 | spin_lock(&conn->session->lock); |
5bb0b55a MC |
790 | __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); |
791 | spin_unlock(&conn->session->lock); | |
7ba24713 AA |
792 | } |
793 | ||
794 | return rc; | |
795 | } | |
796 | ||
797 | static int | |
798 | iscsi_data_recv(struct iscsi_conn *conn) | |
799 | { | |
5bb0b55a MC |
800 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
801 | int rc = 0, opcode; | |
7ba24713 | 802 | |
5bb0b55a MC |
803 | opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
804 | switch (opcode) { | |
7ba24713 AA |
805 | case ISCSI_OP_SCSI_DATA_IN: |
806 | rc = iscsi_scsi_data_in(conn); | |
807 | break; | |
5bb0b55a | 808 | case ISCSI_OP_SCSI_CMD_RSP: |
7ba24713 AA |
809 | case ISCSI_OP_TEXT_RSP: |
810 | case ISCSI_OP_LOGIN_RSP: | |
5bb0b55a MC |
811 | case ISCSI_OP_ASYNC_EVENT: |
812 | case ISCSI_OP_REJECT: | |
7ba24713 AA |
813 | /* |
814 | * Collect data segment to the connection's data | |
815 | * placeholder | |
816 | */ | |
ca518684 | 817 | if (iscsi_tcp_copy(conn, tcp_conn->in.datalen)) { |
7ba24713 AA |
818 | rc = -EAGAIN; |
819 | goto exit; | |
820 | } | |
821 | ||
c8dc1e52 | 822 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data, |
5bb0b55a MC |
823 | tcp_conn->in.datalen); |
824 | if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) | |
c8dc1e52 | 825 | iscsi_recv_digest_update(tcp_conn, conn->data, |
5bb0b55a MC |
826 | tcp_conn->in.datalen); |
827 | break; | |
7ba24713 AA |
828 | default: |
829 | BUG_ON(1); | |
830 | } | |
831 | exit: | |
832 | return rc; | |
833 | } | |
834 | ||
835 | /** | |
836 | * iscsi_tcp_data_recv - TCP receive in sendfile fashion | |
837 | * @rd_desc: read descriptor | |
838 | * @skb: socket buffer | |
839 | * @offset: offset in skb | |
840 | * @len: skb->len - offset | |
841 | **/ | |
842 | static int | |
843 | iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
844 | unsigned int offset, size_t len) | |
845 | { | |
846 | int rc; | |
847 | struct iscsi_conn *conn = rd_desc->arg.data; | |
5bb0b55a | 848 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
849 | int processed; |
850 | char pad[ISCSI_PAD_LEN]; | |
851 | struct scatterlist sg; | |
852 | ||
853 | /* | |
854 | * Save current SKB and its offset in the corresponding | |
855 | * connection context. | |
856 | */ | |
5bb0b55a MC |
857 | tcp_conn->in.copy = skb->len - offset; |
858 | tcp_conn->in.offset = offset; | |
859 | tcp_conn->in.skb = skb; | |
860 | tcp_conn->in.len = tcp_conn->in.copy; | |
861 | BUG_ON(tcp_conn->in.copy <= 0); | |
862 | debug_tcp("in %d bytes\n", tcp_conn->in.copy); | |
7ba24713 AA |
863 | |
864 | more: | |
5bb0b55a | 865 | tcp_conn->in.copied = 0; |
7ba24713 AA |
866 | rc = 0; |
867 | ||
868 | if (unlikely(conn->suspend_rx)) { | |
869 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
870 | return 0; | |
871 | } | |
872 | ||
5bb0b55a MC |
873 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || |
874 | tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { | |
875 | rc = iscsi_hdr_extract(tcp_conn); | |
7ba24713 AA |
876 | if (rc) { |
877 | if (rc == -EAGAIN) | |
878 | goto nomore; | |
879 | else { | |
d82967c7 | 880 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
881 | return 0; |
882 | } | |
883 | } | |
884 | ||
885 | /* | |
886 | * Verify and process incoming PDU header. | |
887 | */ | |
5bb0b55a MC |
888 | rc = iscsi_tcp_hdr_recv(conn); |
889 | if (!rc && tcp_conn->in.datalen) { | |
dd8c0d95 | 890 | if (conn->datadgst_en) |
c9802cd9 | 891 | crypto_hash_init(&tcp_conn->rx_hash); |
5bb0b55a | 892 | tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; |
7ba24713 | 893 | } else if (rc) { |
40527afe | 894 | iscsi_conn_failure(conn, rc); |
7ba24713 AA |
895 | return 0; |
896 | } | |
897 | } | |
898 | ||
5bb0b55a | 899 | if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { |
f6cfba1d | 900 | uint32_t recv_digest; |
5bb0b55a | 901 | |
7ba24713 | 902 | debug_tcp("extra data_recv offset %d copy %d\n", |
5bb0b55a | 903 | tcp_conn->in.offset, tcp_conn->in.copy); |
ca518684 MC |
904 | rc = iscsi_tcp_copy(conn, sizeof(uint32_t)); |
905 | if (rc) { | |
906 | if (rc == -EAGAIN) | |
907 | goto again; | |
908 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
909 | return 0; | |
910 | } | |
911 | ||
912 | memcpy(&recv_digest, conn->data, sizeof(uint32_t)); | |
5bb0b55a | 913 | if (recv_digest != tcp_conn->in.datadgst) { |
f6cfba1d MC |
914 | debug_tcp("iscsi_tcp: data digest error!" |
915 | "0x%x != 0x%x\n", recv_digest, | |
5bb0b55a | 916 | tcp_conn->in.datadgst); |
f6cfba1d MC |
917 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
918 | return 0; | |
919 | } else { | |
920 | debug_tcp("iscsi_tcp: data digest match!" | |
921 | "0x%x == 0x%x\n", recv_digest, | |
5bb0b55a MC |
922 | tcp_conn->in.datadgst); |
923 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
924 | } |
925 | } | |
926 | ||
5bb0b55a MC |
927 | if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && |
928 | tcp_conn->in.copy) { | |
7ba24713 AA |
929 | |
930 | debug_tcp("data_recv offset %d copy %d\n", | |
5bb0b55a | 931 | tcp_conn->in.offset, tcp_conn->in.copy); |
7ba24713 AA |
932 | |
933 | rc = iscsi_data_recv(conn); | |
934 | if (rc) { | |
665b44ae | 935 | if (rc == -EAGAIN) |
7ba24713 | 936 | goto again; |
d82967c7 | 937 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
938 | return 0; |
939 | } | |
5bb0b55a MC |
940 | tcp_conn->in.copy -= tcp_conn->in.padding; |
941 | tcp_conn->in.offset += tcp_conn->in.padding; | |
8a47cd34 | 942 | if (conn->datadgst_en) { |
5bb0b55a MC |
943 | if (tcp_conn->in.padding) { |
944 | debug_tcp("padding -> %d\n", | |
945 | tcp_conn->in.padding); | |
946 | memset(pad, 0, tcp_conn->in.padding); | |
947 | sg_init_one(&sg, pad, tcp_conn->in.padding); | |
c9802cd9 | 948 | crypto_hash_update(&tcp_conn->rx_hash, |
dc64ddf4 | 949 | &sg, sg.length); |
7ba24713 | 950 | } |
c9802cd9 JB |
951 | crypto_hash_final(&tcp_conn->rx_hash, |
952 | (u8 *) &tcp_conn->in.datadgst); | |
5bb0b55a MC |
953 | debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); |
954 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; | |
ca518684 | 955 | tcp_conn->data_copied = 0; |
7ba24713 | 956 | } else |
5bb0b55a | 957 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
7ba24713 AA |
958 | } |
959 | ||
960 | debug_tcp("f, processed %d from out of %d padding %d\n", | |
5bb0b55a MC |
961 | tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); |
962 | BUG_ON(tcp_conn->in.offset - offset > len); | |
7ba24713 | 963 | |
5bb0b55a | 964 | if (tcp_conn->in.offset - offset != len) { |
7ba24713 | 965 | debug_tcp("continue to process %d bytes\n", |
5bb0b55a | 966 | (int)len - (tcp_conn->in.offset - offset)); |
7ba24713 AA |
967 | goto more; |
968 | } | |
969 | ||
970 | nomore: | |
5bb0b55a | 971 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
972 | BUG_ON(processed == 0); |
973 | return processed; | |
974 | ||
975 | again: | |
5bb0b55a | 976 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
977 | debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", |
978 | processed, (int)len, (int)rd_desc->count); | |
979 | BUG_ON(processed == 0); | |
980 | BUG_ON(processed > len); | |
981 | ||
982 | conn->rxdata_octets += processed; | |
983 | return processed; | |
984 | } | |
985 | ||
986 | static void | |
987 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
988 | { | |
989 | struct iscsi_conn *conn = sk->sk_user_data; | |
990 | read_descriptor_t rd_desc; | |
991 | ||
992 | read_lock(&sk->sk_callback_lock); | |
993 | ||
665b44ae MC |
994 | /* |
995 | * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv. | |
996 | * We set count to 1 because we want the network layer to | |
997 | * hand us all the skbs that are available. iscsi_tcp_data_recv | |
998 | * handled pdus that cross buffers or pdus that still need data. | |
999 | */ | |
7ba24713 | 1000 | rd_desc.arg.data = conn; |
665b44ae | 1001 | rd_desc.count = 1; |
7ba24713 AA |
1002 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); |
1003 | ||
1004 | read_unlock(&sk->sk_callback_lock); | |
1005 | } | |
1006 | ||
1007 | static void | |
1008 | iscsi_tcp_state_change(struct sock *sk) | |
1009 | { | |
5bb0b55a | 1010 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
1011 | struct iscsi_conn *conn; |
1012 | struct iscsi_session *session; | |
1013 | void (*old_state_change)(struct sock *); | |
1014 | ||
1015 | read_lock(&sk->sk_callback_lock); | |
1016 | ||
1017 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
1018 | session = conn->session; | |
1019 | ||
e6273993 MC |
1020 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
1021 | sk->sk_state == TCP_CLOSE) && | |
1022 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
1023 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
1024 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1025 | } | |
1026 | ||
5bb0b55a MC |
1027 | tcp_conn = conn->dd_data; |
1028 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
1029 | |
1030 | read_unlock(&sk->sk_callback_lock); | |
1031 | ||
1032 | old_state_change(sk); | |
1033 | } | |
1034 | ||
1035 | /** | |
1036 | * iscsi_write_space - Called when more output buffer space is available | |
1037 | * @sk: socket space is available for | |
1038 | **/ | |
1039 | static void | |
1040 | iscsi_write_space(struct sock *sk) | |
1041 | { | |
1042 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1043 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1044 | ||
1045 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1046 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
55e3299d | 1047 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1048 | } |
1049 | ||
1050 | static void | |
1051 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1052 | { | |
5bb0b55a MC |
1053 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1054 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1055 | |
1056 | /* assign new callbacks */ | |
1057 | write_lock_bh(&sk->sk_callback_lock); | |
1058 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1059 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1060 | tcp_conn->old_state_change = sk->sk_state_change; | |
1061 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1062 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1063 | sk->sk_state_change = iscsi_tcp_state_change; | |
1064 | sk->sk_write_space = iscsi_write_space; | |
1065 | write_unlock_bh(&sk->sk_callback_lock); | |
1066 | } | |
1067 | ||
1068 | static void | |
1c83469d | 1069 | iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 1070 | { |
5bb0b55a | 1071 | struct sock *sk = tcp_conn->sock->sk; |
7ba24713 AA |
1072 | |
1073 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1074 | write_lock_bh(&sk->sk_callback_lock); | |
1075 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1076 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1077 | sk->sk_state_change = tcp_conn->old_state_change; | |
1078 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1079 | sk->sk_no_check = 0; |
1080 | write_unlock_bh(&sk->sk_callback_lock); | |
1081 | } | |
1082 | ||
1083 | /** | |
1084 | * iscsi_send - generic send routine | |
1085 | * @sk: kernel's socket | |
1086 | * @buf: buffer to write from | |
1087 | * @size: actual size to write | |
1088 | * @flags: socket's flags | |
7ba24713 AA |
1089 | */ |
1090 | static inline int | |
56851698 | 1091 | iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
7ba24713 | 1092 | { |
5bb0b55a MC |
1093 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1094 | struct socket *sk = tcp_conn->sock; | |
3219e529 | 1095 | int offset = buf->sg.offset + buf->sent, res; |
7ba24713 | 1096 | |
7cae5159 MC |
1097 | /* |
1098 | * if we got use_sg=0 or are sending something we kmallocd | |
1099 | * then we did not have to do kmap (kmap returns page_address) | |
1100 | * | |
1101 | * if we got use_sg > 0, but had to drop down, we do not | |
1102 | * set clustering so this should only happen for that | |
1103 | * slab case. | |
1104 | */ | |
1105 | if (buf->use_sendmsg) | |
3219e529 | 1106 | res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags); |
7cae5159 | 1107 | else |
3219e529 MC |
1108 | res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags); |
1109 | ||
1110 | if (res >= 0) { | |
1111 | conn->txdata_octets += res; | |
1112 | buf->sent += res; | |
1113 | return res; | |
1114 | } | |
1115 | ||
1116 | tcp_conn->sendpage_failures_cnt++; | |
1117 | if (res == -EAGAIN) | |
1118 | res = -ENOBUFS; | |
1119 | else | |
1120 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1121 | return res; | |
7ba24713 AA |
1122 | } |
1123 | ||
1124 | /** | |
1125 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() | |
1126 | * @conn: iscsi connection | |
1127 | * @buf: buffer to write from | |
1128 | * @datalen: lenght of data to be sent after the header | |
1129 | * | |
1130 | * Notes: | |
1131 | * (Tx, Fast Path) | |
1132 | **/ | |
1133 | static inline int | |
1134 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) | |
1135 | { | |
7ba24713 AA |
1136 | int flags = 0; /* MSG_DONTWAIT; */ |
1137 | int res, size; | |
1138 | ||
1139 | size = buf->sg.length - buf->sent; | |
1140 | BUG_ON(buf->sent + size > buf->sg.length); | |
1141 | if (buf->sent + size != buf->sg.length || datalen) | |
1142 | flags |= MSG_MORE; | |
1143 | ||
56851698 | 1144 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1145 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
1146 | if (res >= 0) { | |
7ba24713 AA |
1147 | if (size != res) |
1148 | return -EAGAIN; | |
1149 | return 0; | |
3219e529 | 1150 | } |
7ba24713 AA |
1151 | |
1152 | return res; | |
1153 | } | |
1154 | ||
1155 | /** | |
1156 | * iscsi_sendpage - send one page of iSCSI Data-Out. | |
1157 | * @conn: iscsi connection | |
1158 | * @buf: buffer to write from | |
1159 | * @count: remaining data | |
1160 | * @sent: number of bytes sent | |
1161 | * | |
1162 | * Notes: | |
1163 | * (Tx, Fast Path) | |
1164 | **/ | |
1165 | static inline int | |
1166 | iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, | |
1167 | int *count, int *sent) | |
1168 | { | |
7ba24713 AA |
1169 | int flags = 0; /* MSG_DONTWAIT; */ |
1170 | int res, size; | |
1171 | ||
1172 | size = buf->sg.length - buf->sent; | |
1173 | BUG_ON(buf->sent + size > buf->sg.length); | |
1174 | if (size > *count) | |
1175 | size = *count; | |
b13941f6 | 1176 | if (buf->sent + size != buf->sg.length || *count != size) |
7ba24713 AA |
1177 | flags |= MSG_MORE; |
1178 | ||
56851698 | 1179 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1180 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
1181 | size, buf->sent, *count, *sent, res); | |
1182 | if (res >= 0) { | |
7ba24713 AA |
1183 | *count -= res; |
1184 | *sent += res; | |
1185 | if (size != res) | |
1186 | return -EAGAIN; | |
1187 | return 0; | |
3219e529 | 1188 | } |
7ba24713 AA |
1189 | |
1190 | return res; | |
1191 | } | |
1192 | ||
1193 | static inline void | |
5bb0b55a | 1194 | iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
62f38300 | 1195 | struct iscsi_tcp_cmd_task *tcp_ctask) |
7ba24713 | 1196 | { |
c9802cd9 | 1197 | crypto_hash_init(&tcp_conn->tx_hash); |
5bb0b55a | 1198 | tcp_ctask->digest_count = 4; |
7ba24713 AA |
1199 | } |
1200 | ||
7ba24713 AA |
1201 | /** |
1202 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1203 | * @conn: iscsi connection | |
1204 | * @ctask: scsi command task | |
1205 | * @r2t: R2T info | |
1206 | * @left: bytes left to transfer | |
1207 | * | |
1208 | * Notes: | |
1209 | * Initialize next Data-Out within this R2T sequence and continue | |
1210 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1211 | * | |
1212 | * Called under connection lock. | |
1213 | **/ | |
1214 | static void | |
1215 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1216 | struct iscsi_r2t_info *r2t, int left) | |
1217 | { | |
1218 | struct iscsi_data *hdr; | |
7ba24713 AA |
1219 | struct scsi_cmnd *sc = ctask->sc; |
1220 | int new_offset; | |
1221 | ||
ffbfe925 | 1222 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
1223 | memset(hdr, 0, sizeof(struct iscsi_data)); |
1224 | hdr->ttt = r2t->ttt; | |
1225 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1226 | r2t->solicit_datasn++; | |
1227 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
1228 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
1229 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
1230 | hdr->exp_statsn = r2t->exp_statsn; |
1231 | new_offset = r2t->data_offset + r2t->sent; | |
1232 | hdr->offset = cpu_to_be32(new_offset); | |
1233 | if (left > conn->max_xmit_dlength) { | |
1234 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1235 | r2t->data_count = conn->max_xmit_dlength; | |
1236 | } else { | |
1237 | hton24(hdr->dlength, left); | |
1238 | r2t->data_count = left; | |
1239 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1240 | } | |
1241 | conn->dataout_pdus_cnt++; | |
1242 | ||
6e458cc9 | 1243 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 1244 | sizeof(struct iscsi_hdr)); |
7ba24713 | 1245 | |
62f38300 MC |
1246 | if (iscsi_buf_left(&r2t->sendbuf)) |
1247 | return; | |
1248 | ||
1249 | if (sc->use_sg) { | |
7ba24713 AA |
1250 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1251 | r2t->sg += 1; | |
62f38300 MC |
1252 | } else { |
1253 | iscsi_buf_init_iov(&r2t->sendbuf, | |
7ba24713 AA |
1254 | (char*)sc->request_buffer + new_offset, |
1255 | r2t->data_count); | |
62f38300 MC |
1256 | r2t->sg = NULL; |
1257 | } | |
7ba24713 AA |
1258 | } |
1259 | ||
62f38300 MC |
1260 | static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask, |
1261 | unsigned long len) | |
7ba24713 | 1262 | { |
62f38300 MC |
1263 | tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1); |
1264 | if (!tcp_ctask->pad_count) | |
1265 | return; | |
7ba24713 | 1266 | |
62f38300 MC |
1267 | tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count; |
1268 | debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count); | |
1269 | tcp_ctask->xmstate |= XMSTATE_W_PAD; | |
7ba24713 AA |
1270 | } |
1271 | ||
1272 | /** | |
5bb0b55a | 1273 | * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 AA |
1274 | * @conn: iscsi connection |
1275 | * @ctask: scsi command task | |
1276 | * @sc: scsi command | |
1277 | **/ | |
1278 | static void | |
5bb0b55a | 1279 | iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
7ba24713 | 1280 | { |
5bb0b55a | 1281 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1282 | |
5bb0b55a | 1283 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
218432c6 | 1284 | tcp_ctask->xmstate = XMSTATE_CMD_HDR_INIT; |
7ba24713 AA |
1285 | } |
1286 | ||
1287 | /** | |
5bb0b55a | 1288 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
7ba24713 AA |
1289 | * @conn: iscsi connection |
1290 | * @mtask: task management task | |
1291 | * | |
1292 | * Notes: | |
1293 | * The function can return -EAGAIN in which case caller must | |
1294 | * call it again later, or recover. '0' return code means successful | |
1295 | * xmit. | |
1296 | * | |
218432c6 MC |
1297 | * Management xmit state machine consists of these states: |
1298 | * XMSTATE_IMM_HDR_INIT - calculate digest of PDU Header | |
1299 | * XMSTATE_IMM_HDR - PDU Header xmit in progress | |
1300 | * XMSTATE_IMM_DATA - PDU Data xmit in progress | |
1301 | * XMSTATE_IDLE - management PDU is done | |
7ba24713 AA |
1302 | **/ |
1303 | static int | |
5bb0b55a | 1304 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1305 | { |
5bb0b55a | 1306 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
3219e529 | 1307 | int rc; |
7ba24713 AA |
1308 | |
1309 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", | |
5bb0b55a | 1310 | conn->id, tcp_mtask->xmstate, mtask->itt); |
7ba24713 | 1311 | |
218432c6 MC |
1312 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR_INIT) { |
1313 | iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr, | |
1314 | sizeof(struct iscsi_hdr)); | |
1315 | ||
1316 | if (mtask->data_count) { | |
5bb0b55a | 1317 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
218432c6 MC |
1318 | iscsi_buf_init_iov(&tcp_mtask->sendbuf, |
1319 | (char*)mtask->data, | |
1320 | mtask->data_count); | |
1321 | } | |
1322 | ||
af973481 | 1323 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
30a6c652 | 1324 | conn->stop_stage != STOP_CONN_RECOVER && |
af973481 | 1325 | conn->hdrdgst_en) |
5bb0b55a MC |
1326 | iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
1327 | (u8*)tcp_mtask->hdrext); | |
218432c6 MC |
1328 | |
1329 | tcp_mtask->sent = 0; | |
1330 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR_INIT; | |
1331 | tcp_mtask->xmstate |= XMSTATE_IMM_HDR; | |
1332 | } | |
1333 | ||
1334 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { | |
3219e529 MC |
1335 | rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf, |
1336 | mtask->data_count); | |
218432c6 | 1337 | if (rc) |
3219e529 | 1338 | return rc; |
218432c6 | 1339 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; |
7ba24713 AA |
1340 | } |
1341 | ||
5bb0b55a | 1342 | if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 | 1343 | BUG_ON(!mtask->data_count); |
5bb0b55a | 1344 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1345 | /* FIXME: implement. |
1346 | * Virtual buffer could be spreaded across multiple pages... | |
1347 | */ | |
1348 | do { | |
3219e529 MC |
1349 | int rc; |
1350 | ||
1351 | rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf, | |
1352 | &mtask->data_count, &tcp_mtask->sent); | |
1353 | if (rc) { | |
5bb0b55a | 1354 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
3219e529 | 1355 | return rc; |
7ba24713 AA |
1356 | } |
1357 | } while (mtask->data_count); | |
1358 | } | |
1359 | ||
5bb0b55a | 1360 | BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
b4377356 | 1361 | if (mtask->hdr->itt == RESERVED_ITT) { |
5bb0b55a MC |
1362 | struct iscsi_session *session = conn->session; |
1363 | ||
1364 | spin_lock_bh(&session->lock); | |
1365 | list_del(&conn->mtask->running); | |
1366 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, | |
1367 | sizeof(void*)); | |
1368 | spin_unlock_bh(&session->lock); | |
1369 | } | |
7ba24713 AA |
1370 | return 0; |
1371 | } | |
1372 | ||
218432c6 MC |
1373 | static int |
1374 | iscsi_send_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1375 | { |
218432c6 MC |
1376 | struct scsi_cmnd *sc = ctask->sc; |
1377 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1378 | int rc = 0; | |
3219e529 | 1379 | |
218432c6 MC |
1380 | if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_INIT) { |
1381 | tcp_ctask->sent = 0; | |
1382 | tcp_ctask->sg_count = 0; | |
1383 | tcp_ctask->exp_datasn = 0; | |
1384 | ||
1385 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
1386 | if (sc->use_sg) { | |
1387 | struct scatterlist *sg = sc->request_buffer; | |
1388 | ||
1389 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg); | |
1390 | tcp_ctask->sg = sg + 1; | |
1391 | tcp_ctask->bad_sg = sg + sc->use_sg; | |
1392 | } else { | |
1393 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, | |
1394 | sc->request_buffer, | |
1395 | sc->request_bufflen); | |
1396 | tcp_ctask->sg = NULL; | |
1397 | tcp_ctask->bad_sg = NULL; | |
1398 | } | |
7ba24713 | 1399 | |
218432c6 MC |
1400 | debug_scsi("cmd [itt 0x%x total %d imm_data %d " |
1401 | "unsol count %d, unsol offset %d]\n", | |
1402 | ctask->itt, sc->request_bufflen, | |
1403 | ctask->imm_count, ctask->unsol_count, | |
1404 | ctask->unsol_offset); | |
1405 | } | |
5bb0b55a | 1406 | |
218432c6 MC |
1407 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, |
1408 | sizeof(struct iscsi_hdr)); | |
1409 | ||
1410 | if (conn->hdrdgst_en) | |
1411 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, | |
1412 | (u8*)tcp_ctask->hdrext); | |
1413 | tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_INIT; | |
1414 | tcp_ctask->xmstate |= XMSTATE_CMD_HDR_XMIT; | |
62f38300 MC |
1415 | } |
1416 | ||
218432c6 MC |
1417 | if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_XMIT) { |
1418 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count); | |
1419 | if (rc) | |
1420 | return rc; | |
1421 | tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_XMIT; | |
1422 | ||
1423 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
1424 | return 0; | |
1425 | ||
1426 | if (ctask->imm_count) { | |
1427 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; | |
1428 | iscsi_set_padding(tcp_ctask, ctask->imm_count); | |
62f38300 | 1429 | |
218432c6 MC |
1430 | if (ctask->conn->datadgst_en) { |
1431 | iscsi_data_digest_init(ctask->conn->dd_data, | |
1432 | tcp_ctask); | |
1433 | tcp_ctask->immdigest = 0; | |
1434 | } | |
62f38300 | 1435 | } |
62f38300 | 1436 | |
218432c6 MC |
1437 | if (ctask->unsol_count) |
1438 | tcp_ctask->xmstate |= | |
1439 | XMSTATE_UNS_HDR | XMSTATE_UNS_INIT; | |
1440 | } | |
1441 | return rc; | |
7ba24713 AA |
1442 | } |
1443 | ||
62f38300 MC |
1444 | static int |
1445 | iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1446 | { |
5bb0b55a | 1447 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
62f38300 MC |
1448 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1449 | int sent = 0, rc; | |
5bb0b55a | 1450 | |
62f38300 MC |
1451 | if (tcp_ctask->xmstate & XMSTATE_W_PAD) { |
1452 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, | |
1453 | tcp_ctask->pad_count); | |
1454 | if (conn->datadgst_en) | |
c9802cd9 JB |
1455 | crypto_hash_update(&tcp_conn->tx_hash, |
1456 | &tcp_ctask->sendbuf.sg, | |
1457 | tcp_ctask->sendbuf.sg.length); | |
62f38300 MC |
1458 | } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD)) |
1459 | return 0; | |
1460 | ||
1461 | tcp_ctask->xmstate &= ~XMSTATE_W_PAD; | |
1462 | tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD; | |
1463 | debug_scsi("sending %d pad bytes for itt 0x%x\n", | |
1464 | tcp_ctask->pad_count, ctask->itt); | |
1465 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, | |
1466 | &sent); | |
3219e529 | 1467 | if (rc) { |
62f38300 MC |
1468 | debug_scsi("padding send failed %d\n", rc); |
1469 | tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD; | |
7ba24713 | 1470 | } |
3219e529 | 1471 | return rc; |
7ba24713 AA |
1472 | } |
1473 | ||
62f38300 MC |
1474 | static int |
1475 | iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1476 | struct iscsi_buf *buf, uint32_t *digest) | |
7ba24713 | 1477 | { |
62f38300 MC |
1478 | struct iscsi_tcp_cmd_task *tcp_ctask; |
1479 | struct iscsi_tcp_conn *tcp_conn; | |
1480 | int rc, sent = 0; | |
5bb0b55a | 1481 | |
62f38300 MC |
1482 | if (!conn->datadgst_en) |
1483 | return 0; | |
7ba24713 | 1484 | |
62f38300 MC |
1485 | tcp_ctask = ctask->dd_data; |
1486 | tcp_conn = conn->dd_data; | |
7ba24713 | 1487 | |
62f38300 | 1488 | if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) { |
c9802cd9 | 1489 | crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest); |
62f38300 MC |
1490 | iscsi_buf_init_iov(buf, (char*)digest, 4); |
1491 | } | |
1492 | tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST; | |
7ba24713 | 1493 | |
62f38300 MC |
1494 | rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
1495 | if (!rc) | |
1496 | debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest, | |
1497 | ctask->itt); | |
1498 | else { | |
1499 | debug_scsi("sending digest 0x%x failed for itt 0x%x!\n", | |
1500 | *digest, ctask->itt); | |
1501 | tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST; | |
7ba24713 | 1502 | } |
62f38300 MC |
1503 | return rc; |
1504 | } | |
7ba24713 | 1505 | |
62f38300 MC |
1506 | static int |
1507 | iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf, | |
1508 | struct scatterlist **sg, int *sent, int *count, | |
1509 | struct iscsi_buf *digestbuf, uint32_t *digest) | |
1510 | { | |
1511 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1512 | struct iscsi_conn *conn = ctask->conn; | |
1513 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1514 | int rc, buf_sent, offset; | |
1515 | ||
1516 | while (*count) { | |
1517 | buf_sent = 0; | |
1518 | offset = sendbuf->sent; | |
1519 | ||
1520 | rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent); | |
1521 | *sent = *sent + buf_sent; | |
1522 | if (buf_sent && conn->datadgst_en) | |
c9802cd9 | 1523 | partial_sg_digest_update(&tcp_conn->tx_hash, |
62f38300 MC |
1524 | &sendbuf->sg, sendbuf->sg.offset + offset, |
1525 | buf_sent); | |
1526 | if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) { | |
1527 | iscsi_buf_init_sg(sendbuf, *sg); | |
1528 | *sg = *sg + 1; | |
7ba24713 | 1529 | } |
62f38300 MC |
1530 | |
1531 | if (rc) | |
1532 | return rc; | |
7ba24713 AA |
1533 | } |
1534 | ||
62f38300 MC |
1535 | rc = iscsi_send_padding(conn, ctask); |
1536 | if (rc) | |
1537 | return rc; | |
1538 | ||
1539 | return iscsi_send_digest(conn, ctask, digestbuf, digest); | |
7ba24713 AA |
1540 | } |
1541 | ||
62f38300 MC |
1542 | static int |
1543 | iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1544 | { |
5bb0b55a | 1545 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1546 | struct iscsi_data_task *dtask; |
3219e529 | 1547 | int rc; |
7ba24713 | 1548 | |
5bb0b55a MC |
1549 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
1550 | if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { | |
62f38300 MC |
1551 | dtask = &tcp_ctask->unsol_dtask; |
1552 | ||
ffd0436e MC |
1553 | iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr); |
1554 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, | |
1555 | sizeof(struct iscsi_hdr)); | |
af973481 | 1556 | if (conn->hdrdgst_en) |
5bb0b55a | 1557 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
af973481 | 1558 | (u8*)dtask->hdrext); |
62f38300 | 1559 | |
5bb0b55a | 1560 | tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
62f38300 | 1561 | iscsi_set_padding(tcp_ctask, ctask->data_count); |
7ba24713 | 1562 | } |
3219e529 MC |
1563 | |
1564 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count); | |
1565 | if (rc) { | |
5bb0b55a MC |
1566 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
1567 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR; | |
3219e529 | 1568 | return rc; |
7ba24713 AA |
1569 | } |
1570 | ||
dd8c0d95 MC |
1571 | if (conn->datadgst_en) { |
1572 | dtask = &tcp_ctask->unsol_dtask; | |
1573 | iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask); | |
1574 | dtask->digest = 0; | |
1575 | } | |
1576 | ||
7ba24713 | 1577 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", |
5bb0b55a | 1578 | ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
7ba24713 AA |
1579 | return 0; |
1580 | } | |
1581 | ||
62f38300 MC |
1582 | static int |
1583 | iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1584 | { |
5bb0b55a | 1585 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1586 | int rc; |
7ba24713 | 1587 | |
62f38300 MC |
1588 | if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
1589 | BUG_ON(!ctask->unsol_count); | |
1590 | tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; | |
1591 | send_hdr: | |
1592 | rc = iscsi_send_unsol_hdr(conn, ctask); | |
1593 | if (rc) | |
1594 | return rc; | |
7ba24713 AA |
1595 | } |
1596 | ||
62f38300 MC |
1597 | if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
1598 | struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask; | |
5bb0b55a | 1599 | int start = tcp_ctask->sent; |
7ba24713 | 1600 | |
62f38300 MC |
1601 | rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg, |
1602 | &tcp_ctask->sent, &ctask->data_count, | |
1603 | &dtask->digestbuf, &dtask->digest); | |
5bb0b55a | 1604 | ctask->unsol_count -= tcp_ctask->sent - start; |
62f38300 MC |
1605 | if (rc) |
1606 | return rc; | |
1607 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; | |
7ba24713 | 1608 | /* |
62f38300 MC |
1609 | * Done with the Data-Out. Next, check if we need |
1610 | * to send another unsolicited Data-Out. | |
7ba24713 | 1611 | */ |
62f38300 MC |
1612 | if (ctask->unsol_count) { |
1613 | debug_scsi("sending more uns\n"); | |
1614 | tcp_ctask->xmstate |= XMSTATE_UNS_INIT; | |
1615 | goto send_hdr; | |
7ba24713 | 1616 | } |
7ba24713 | 1617 | } |
7ba24713 AA |
1618 | return 0; |
1619 | } | |
1620 | ||
62f38300 MC |
1621 | static int iscsi_send_sol_pdu(struct iscsi_conn *conn, |
1622 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1623 | { |
5bb0b55a | 1624 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
62f38300 MC |
1625 | struct iscsi_session *session = conn->session; |
1626 | struct iscsi_r2t_info *r2t; | |
1627 | struct iscsi_data_task *dtask; | |
3219e529 | 1628 | int left, rc; |
7ba24713 | 1629 | |
218432c6 | 1630 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR_INIT) { |
db37c505 MC |
1631 | if (!tcp_ctask->r2t) { |
1632 | spin_lock_bh(&session->lock); | |
62f38300 MC |
1633 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, |
1634 | sizeof(void*)); | |
db37c505 MC |
1635 | spin_unlock_bh(&session->lock); |
1636 | } | |
62f38300 MC |
1637 | send_hdr: |
1638 | r2t = tcp_ctask->r2t; | |
1639 | dtask = &r2t->dtask; | |
7ba24713 | 1640 | |
62f38300 MC |
1641 | if (conn->hdrdgst_en) |
1642 | iscsi_hdr_digest(conn, &r2t->headbuf, | |
1643 | (u8*)dtask->hdrext); | |
218432c6 MC |
1644 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR_INIT; |
1645 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
1646 | } | |
1647 | ||
1648 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { | |
1649 | r2t = tcp_ctask->r2t; | |
1650 | dtask = &r2t->dtask; | |
1651 | ||
62f38300 | 1652 | rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count); |
218432c6 | 1653 | if (rc) |
3219e529 | 1654 | return rc; |
218432c6 MC |
1655 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
1656 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
7ba24713 | 1657 | |
7ba24713 | 1658 | if (conn->datadgst_en) { |
dd8c0d95 MC |
1659 | iscsi_data_digest_init(conn->dd_data, tcp_ctask); |
1660 | dtask->digest = 0; | |
7ba24713 | 1661 | } |
7ba24713 | 1662 | |
62f38300 MC |
1663 | iscsi_set_padding(tcp_ctask, r2t->data_count); |
1664 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", | |
1665 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, | |
1666 | r2t->sent); | |
7ba24713 AA |
1667 | } |
1668 | ||
62f38300 MC |
1669 | if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
1670 | r2t = tcp_ctask->r2t; | |
1671 | dtask = &r2t->dtask; | |
7ba24713 | 1672 | |
62f38300 MC |
1673 | rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg, |
1674 | &r2t->sent, &r2t->data_count, | |
1675 | &dtask->digestbuf, &dtask->digest); | |
1676 | if (rc) | |
1677 | return rc; | |
1678 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; | |
7ba24713 | 1679 | |
62f38300 MC |
1680 | /* |
1681 | * Done with this Data-Out. Next, check if we have | |
1682 | * to send another Data-Out for this R2T. | |
1683 | */ | |
1684 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1685 | left = r2t->data_length - r2t->sent; | |
1686 | if (left) { | |
1687 | iscsi_solicit_data_cont(conn, ctask, r2t, left); | |
62f38300 MC |
1688 | goto send_hdr; |
1689 | } | |
7ba24713 | 1690 | |
62f38300 MC |
1691 | /* |
1692 | * Done with this R2T. Check if there are more | |
1693 | * outstanding R2Ts ready to be processed. | |
1694 | */ | |
1695 | spin_lock_bh(&session->lock); | |
1696 | tcp_ctask->r2t = NULL; | |
1697 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
1698 | sizeof(void*)); | |
1699 | if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, | |
1700 | sizeof(void*))) { | |
1701 | tcp_ctask->r2t = r2t; | |
62f38300 MC |
1702 | spin_unlock_bh(&session->lock); |
1703 | goto send_hdr; | |
7ba24713 | 1704 | } |
62f38300 | 1705 | spin_unlock_bh(&session->lock); |
7ba24713 | 1706 | } |
7ba24713 AA |
1707 | return 0; |
1708 | } | |
1709 | ||
218432c6 MC |
1710 | /** |
1711 | * iscsi_tcp_ctask_xmit - xmit normal PDU task | |
1712 | * @conn: iscsi connection | |
1713 | * @ctask: iscsi command task | |
1714 | * | |
1715 | * Notes: | |
1716 | * The function can return -EAGAIN in which case caller must | |
1717 | * call it again later, or recover. '0' return code means successful | |
1718 | * xmit. | |
1719 | * The function is devided to logical helpers (above) for the different | |
1720 | * xmit stages. | |
1721 | * | |
1722 | *iscsi_send_cmd_hdr() | |
1723 | * XMSTATE_CMD_HDR_INIT - prepare Header and Data buffers Calculate | |
1724 | * Header Digest | |
1725 | * XMSTATE_CMD_HDR_XMIT - Transmit header in progress | |
1726 | * | |
1727 | *iscsi_send_padding | |
1728 | * XMSTATE_W_PAD - Prepare and send pading | |
1729 | * XMSTATE_W_RESEND_PAD - retry send pading | |
1730 | * | |
1731 | *iscsi_send_digest | |
1732 | * XMSTATE_W_RESEND_DATA_DIGEST - Finalize and send Data Digest | |
1733 | * XMSTATE_W_RESEND_DATA_DIGEST - retry sending digest | |
1734 | * | |
1735 | *iscsi_send_unsol_hdr | |
1736 | * XMSTATE_UNS_INIT - prepare un-solicit data header and digest | |
1737 | * XMSTATE_UNS_HDR - send un-solicit header | |
1738 | * | |
1739 | *iscsi_send_unsol_pdu | |
1740 | * XMSTATE_UNS_DATA - send un-solicit data in progress | |
1741 | * | |
1742 | *iscsi_send_sol_pdu | |
1743 | * XMSTATE_SOL_HDR_INIT - solicit data header and digest initialize | |
1744 | * XMSTATE_SOL_HDR - send solicit header | |
1745 | * XMSTATE_SOL_DATA - send solicit data | |
1746 | * | |
1747 | *iscsi_tcp_ctask_xmit | |
1748 | * XMSTATE_IMM_DATA - xmit managment data (??) | |
1749 | **/ | |
7ba24713 | 1750 | static int |
5bb0b55a | 1751 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 1752 | { |
5bb0b55a | 1753 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1754 | int rc = 0; |
1755 | ||
1756 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", | |
5bb0b55a | 1757 | conn->id, tcp_ctask->xmstate, ctask->itt); |
7ba24713 | 1758 | |
218432c6 MC |
1759 | rc = iscsi_send_cmd_hdr(conn, ctask); |
1760 | if (rc) | |
1761 | return rc; | |
1762 | if (ctask->sc->sc_data_direction != DMA_TO_DEVICE) | |
1763 | return 0; | |
7ba24713 | 1764 | |
5bb0b55a | 1765 | if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
62f38300 MC |
1766 | rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg, |
1767 | &tcp_ctask->sent, &ctask->imm_count, | |
1768 | &tcp_ctask->immbuf, &tcp_ctask->immdigest); | |
7ba24713 AA |
1769 | if (rc) |
1770 | return rc; | |
62f38300 | 1771 | tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1772 | } |
1773 | ||
62f38300 MC |
1774 | rc = iscsi_send_unsol_pdu(conn, ctask); |
1775 | if (rc) | |
1776 | return rc; | |
7ba24713 | 1777 | |
62f38300 MC |
1778 | rc = iscsi_send_sol_pdu(conn, ctask); |
1779 | if (rc) | |
1780 | return rc; | |
7ba24713 AA |
1781 | |
1782 | return rc; | |
1783 | } | |
1784 | ||
5bb0b55a MC |
1785 | static struct iscsi_cls_conn * |
1786 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1787 | { |
5bb0b55a MC |
1788 | struct iscsi_conn *conn; |
1789 | struct iscsi_cls_conn *cls_conn; | |
1790 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1791 | |
5bb0b55a MC |
1792 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
1793 | if (!cls_conn) | |
1794 | return NULL; | |
1795 | conn = cls_conn->dd_data; | |
7ba24713 | 1796 | /* |
5bb0b55a MC |
1797 | * due to strange issues with iser these are not set |
1798 | * in iscsi_conn_setup | |
7ba24713 | 1799 | */ |
bf32ed33 | 1800 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; |
7ba24713 | 1801 | |
5bb0b55a MC |
1802 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
1803 | if (!tcp_conn) | |
1804 | goto tcp_conn_alloc_fail; | |
7ba24713 | 1805 | |
5bb0b55a MC |
1806 | conn->dd_data = tcp_conn; |
1807 | tcp_conn->iscsi_conn = conn; | |
1808 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
1809 | /* initial operational parameters */ | |
1810 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); | |
7ba24713 | 1811 | |
c9802cd9 JB |
1812 | tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1813 | CRYPTO_ALG_ASYNC); | |
1814 | tcp_conn->tx_hash.flags = 0; | |
0f238418 MC |
1815 | if (IS_ERR(tcp_conn->tx_hash.tfm)) { |
1816 | printk(KERN_ERR "Could not create connection due to crc32c " | |
1817 | "loading error %ld. Make sure the crc32c module is " | |
1818 | "built as a module or into the kernel\n", | |
1819 | PTR_ERR(tcp_conn->tx_hash.tfm)); | |
dd8c0d95 | 1820 | goto free_tcp_conn; |
0f238418 | 1821 | } |
dd8c0d95 | 1822 | |
c9802cd9 JB |
1823 | tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1824 | CRYPTO_ALG_ASYNC); | |
1825 | tcp_conn->rx_hash.flags = 0; | |
0f238418 MC |
1826 | if (IS_ERR(tcp_conn->rx_hash.tfm)) { |
1827 | printk(KERN_ERR "Could not create connection due to crc32c " | |
1828 | "loading error %ld. Make sure the crc32c module is " | |
1829 | "built as a module or into the kernel\n", | |
1830 | PTR_ERR(tcp_conn->rx_hash.tfm)); | |
dd8c0d95 | 1831 | goto free_tx_tfm; |
0f238418 | 1832 | } |
dd8c0d95 | 1833 | |
5bb0b55a | 1834 | return cls_conn; |
7ba24713 | 1835 | |
dd8c0d95 | 1836 | free_tx_tfm: |
c9802cd9 | 1837 | crypto_free_hash(tcp_conn->tx_hash.tfm); |
dd8c0d95 MC |
1838 | free_tcp_conn: |
1839 | kfree(tcp_conn); | |
5bb0b55a MC |
1840 | tcp_conn_alloc_fail: |
1841 | iscsi_conn_teardown(cls_conn); | |
1842 | return NULL; | |
7ba24713 AA |
1843 | } |
1844 | ||
1c83469d MC |
1845 | static void |
1846 | iscsi_tcp_release_conn(struct iscsi_conn *conn) | |
1847 | { | |
1848 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1849 | ||
1850 | if (!tcp_conn->sock) | |
1851 | return; | |
1852 | ||
1853 | sock_hold(tcp_conn->sock->sk); | |
1854 | iscsi_conn_restore_callbacks(tcp_conn); | |
1855 | sock_put(tcp_conn->sock->sk); | |
1856 | ||
1857 | sock_release(tcp_conn->sock); | |
1858 | tcp_conn->sock = NULL; | |
1859 | conn->recv_lock = NULL; | |
1860 | } | |
1861 | ||
7ba24713 | 1862 | static void |
5bb0b55a | 1863 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1864 | { |
5bb0b55a MC |
1865 | struct iscsi_conn *conn = cls_conn->dd_data; |
1866 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 | 1867 | |
1c83469d | 1868 | iscsi_tcp_release_conn(conn); |
5bb0b55a | 1869 | iscsi_conn_teardown(cls_conn); |
7ba24713 | 1870 | |
534284a0 PW |
1871 | if (tcp_conn->tx_hash.tfm) |
1872 | crypto_free_hash(tcp_conn->tx_hash.tfm); | |
1873 | if (tcp_conn->rx_hash.tfm) | |
1874 | crypto_free_hash(tcp_conn->rx_hash.tfm); | |
7ba24713 | 1875 | |
5bb0b55a MC |
1876 | kfree(tcp_conn); |
1877 | } | |
7ba24713 | 1878 | |
1c83469d MC |
1879 | static void |
1880 | iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1881 | { | |
1882 | struct iscsi_conn *conn = cls_conn->dd_data; | |
d5390f5f | 1883 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1c83469d MC |
1884 | |
1885 | iscsi_conn_stop(cls_conn, flag); | |
1886 | iscsi_tcp_release_conn(conn); | |
d5390f5f | 1887 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
1c83469d MC |
1888 | } |
1889 | ||
5bb0b55a MC |
1890 | static int |
1891 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1892 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1893 | int is_leading) |
1894 | { | |
1895 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1896 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1897 | struct sock *sk; | |
1898 | struct socket *sock; | |
1899 | int err; | |
7ba24713 | 1900 | |
5bb0b55a | 1901 | /* lookup for existing socket */ |
264faaaa | 1902 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a MC |
1903 | if (!sock) { |
1904 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); | |
1905 | return -EEXIST; | |
7ba24713 AA |
1906 | } |
1907 | ||
5bb0b55a MC |
1908 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
1909 | if (err) | |
1910 | return err; | |
7ba24713 | 1911 | |
67a61114 MC |
1912 | /* bind iSCSI connection and socket */ |
1913 | tcp_conn->sock = sock; | |
7ba24713 | 1914 | |
67a61114 MC |
1915 | /* setup Socket parameters */ |
1916 | sk = sock->sk; | |
1917 | sk->sk_reuse = 1; | |
1918 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
1919 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 1920 | |
67a61114 | 1921 | /* FIXME: disable Nagle's algorithm */ |
7ba24713 | 1922 | |
67a61114 MC |
1923 | /* |
1924 | * Intercept TCP callbacks for sendfile like receive | |
1925 | * processing. | |
1926 | */ | |
1927 | conn->recv_lock = &sk->sk_callback_lock; | |
1928 | iscsi_conn_set_callbacks(conn); | |
1929 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; | |
1930 | /* | |
1931 | * set receive state machine into initial state | |
1932 | */ | |
1933 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 | 1934 | |
7ba24713 AA |
1935 | return 0; |
1936 | } | |
1937 | ||
5bb0b55a | 1938 | /* called with host lock */ |
30a6c652 | 1939 | static void |
77a23c21 | 1940 | iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1941 | { |
5bb0b55a | 1942 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
218432c6 | 1943 | tcp_mtask->xmstate = XMSTATE_IMM_HDR_INIT; |
7ba24713 AA |
1944 | } |
1945 | ||
1946 | static int | |
1947 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
1948 | { | |
1949 | int i; | |
1950 | int cmd_i; | |
1951 | ||
1952 | /* | |
1953 | * initialize per-task: R2T pool and xmit queue | |
1954 | */ | |
1955 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1956 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
5bb0b55a | 1957 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1958 | |
1959 | /* | |
1960 | * pre-allocated x4 as much r2ts to handle race when | |
1961 | * target acks DataOut faster than we data_xmit() queues | |
1962 | * could replenish r2tqueue. | |
1963 | */ | |
1964 | ||
1965 | /* R2T pool */ | |
5bb0b55a MC |
1966 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
1967 | (void***)&tcp_ctask->r2ts, | |
1968 | sizeof(struct iscsi_r2t_info))) { | |
7ba24713 AA |
1969 | goto r2t_alloc_fail; |
1970 | } | |
1971 | ||
1972 | /* R2T xmit queue */ | |
5bb0b55a | 1973 | tcp_ctask->r2tqueue = kfifo_alloc( |
7ba24713 | 1974 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
5bb0b55a MC |
1975 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
1976 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
1977 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
1978 | goto r2t_alloc_fail; |
1979 | } | |
7ba24713 AA |
1980 | } |
1981 | ||
1982 | return 0; | |
1983 | ||
1984 | r2t_alloc_fail: | |
1985 | for (i = 0; i < cmd_i; i++) { | |
5bb0b55a MC |
1986 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
1987 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1988 | ||
5bb0b55a MC |
1989 | kfifo_free(tcp_ctask->r2tqueue); |
1990 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
1991 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
1992 | } |
1993 | return -ENOMEM; | |
1994 | } | |
1995 | ||
1996 | static void | |
1997 | iscsi_r2tpool_free(struct iscsi_session *session) | |
1998 | { | |
1999 | int i; | |
2000 | ||
2001 | for (i = 0; i < session->cmds_max; i++) { | |
5bb0b55a MC |
2002 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2003 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 2004 | |
5bb0b55a MC |
2005 | kfifo_free(tcp_ctask->r2tqueue); |
2006 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2007 | (void**)tcp_ctask->r2ts); | |
7ba24713 | 2008 | } |
7ba24713 AA |
2009 | } |
2010 | ||
2011 | static int | |
7b7232f3 | 2012 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
5c75b7fc | 2013 | char *buf, int buflen) |
7ba24713 | 2014 | { |
7b7232f3 | 2015 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 2016 | struct iscsi_session *session = conn->session; |
5bb0b55a | 2017 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5c75b7fc | 2018 | int value; |
7ba24713 | 2019 | |
7ba24713 | 2020 | switch(param) { |
7ba24713 | 2021 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 2022 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a | 2023 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
dd8c0d95 | 2024 | if (conn->hdrdgst_en) |
5bb0b55a | 2025 | tcp_conn->hdr_size += sizeof(__u32); |
7ba24713 AA |
2026 | break; |
2027 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 2028 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a MC |
2029 | tcp_conn->sendpage = conn->datadgst_en ? |
2030 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 | 2031 | break; |
7ba24713 | 2032 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 2033 | sscanf(buf, "%d", &value); |
7ba24713 AA |
2034 | if (session->max_r2t == roundup_pow_of_two(value)) |
2035 | break; | |
2036 | iscsi_r2tpool_free(session); | |
5c75b7fc | 2037 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2038 | if (session->max_r2t & (session->max_r2t - 1)) |
2039 | session->max_r2t = roundup_pow_of_two(session->max_r2t); | |
2040 | if (iscsi_r2tpool_alloc(session)) | |
2041 | return -ENOMEM; | |
2042 | break; | |
7ba24713 | 2043 | default: |
5c75b7fc | 2044 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2045 | } |
2046 | ||
2047 | return 0; | |
2048 | } | |
2049 | ||
2050 | static int | |
5c75b7fc MC |
2051 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
2052 | enum iscsi_param param, char *buf) | |
7b8631b5 | 2053 | { |
7b7232f3 | 2054 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2055 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
fd7255f5 | 2056 | struct inet_sock *inet; |
5c75b7fc MC |
2057 | struct ipv6_pinfo *np; |
2058 | struct sock *sk; | |
2059 | int len; | |
7b8631b5 MC |
2060 | |
2061 | switch(param) { | |
fd7255f5 | 2062 | case ISCSI_PARAM_CONN_PORT: |
77a23c21 | 2063 | if (!tcp_conn->sock) |
fd7255f5 | 2064 | return -EINVAL; |
fd7255f5 | 2065 | |
5bb0b55a | 2066 | inet = inet_sk(tcp_conn->sock->sk); |
5c75b7fc | 2067 | len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport)); |
8d2860b3 | 2068 | break; |
fd7255f5 | 2069 | case ISCSI_PARAM_CONN_ADDRESS: |
77a23c21 | 2070 | if (!tcp_conn->sock) |
fd7255f5 | 2071 | return -EINVAL; |
fd7255f5 | 2072 | |
5bb0b55a | 2073 | sk = tcp_conn->sock->sk; |
fd7255f5 MC |
2074 | if (sk->sk_family == PF_INET) { |
2075 | inet = inet_sk(sk); | |
94cb3f82 | 2076 | len = sprintf(buf, NIPQUAD_FMT "\n", |
fd7255f5 MC |
2077 | NIPQUAD(inet->daddr)); |
2078 | } else { | |
2079 | np = inet6_sk(sk); | |
94cb3f82 | 2080 | len = sprintf(buf, NIP6_FMT "\n", NIP6(np->daddr)); |
fd7255f5 | 2081 | } |
fd7255f5 MC |
2082 | break; |
2083 | default: | |
5c75b7fc | 2084 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
2085 | } |
2086 | ||
2087 | return len; | |
2088 | } | |
2089 | ||
7ba24713 | 2090 | static void |
7b7232f3 | 2091 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 2092 | { |
7b7232f3 | 2093 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2094 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
2095 | |
2096 | stats->txdata_octets = conn->txdata_octets; | |
2097 | stats->rxdata_octets = conn->rxdata_octets; | |
2098 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
2099 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
2100 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
2101 | stats->datain_pdus = conn->datain_pdus_cnt; | |
2102 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
2103 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
2104 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
2105 | stats->custom_length = 3; | |
2106 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 2107 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 2108 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 2109 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
2110 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
2111 | stats->custom[2].value = conn->eh_abort_cnt; | |
2112 | } | |
2113 | ||
5bb0b55a MC |
2114 | static struct iscsi_cls_session * |
2115 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, | |
2116 | struct scsi_transport_template *scsit, | |
2117 | uint32_t initial_cmdsn, uint32_t *hostno) | |
7ba24713 | 2118 | { |
5bb0b55a MC |
2119 | struct iscsi_cls_session *cls_session; |
2120 | struct iscsi_session *session; | |
2121 | uint32_t hn; | |
2122 | int cmd_i; | |
7ba24713 | 2123 | |
5bb0b55a MC |
2124 | cls_session = iscsi_session_setup(iscsit, scsit, |
2125 | sizeof(struct iscsi_tcp_cmd_task), | |
2126 | sizeof(struct iscsi_tcp_mgmt_task), | |
2127 | initial_cmdsn, &hn); | |
2128 | if (!cls_session) | |
2129 | return NULL; | |
2130 | *hostno = hn; | |
7ba24713 | 2131 | |
5bb0b55a MC |
2132 | session = class_to_transport_session(cls_session); |
2133 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2134 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
2135 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2136 | ||
2137 | ctask->hdr = &tcp_ctask->hdr; | |
2138 | } | |
2139 | ||
2140 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
2141 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
2142 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
2143 | ||
2144 | mtask->hdr = &tcp_mtask->hdr; | |
2145 | } | |
2146 | ||
2147 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) | |
2148 | goto r2tpool_alloc_fail; | |
2149 | ||
2150 | return cls_session; | |
2151 | ||
2152 | r2tpool_alloc_fail: | |
2153 | iscsi_session_teardown(cls_session); | |
2154 | return NULL; | |
2155 | } | |
2156 | ||
2157 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
2158 | { | |
5bb0b55a MC |
2159 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
2160 | iscsi_session_teardown(cls_session); | |
7ba24713 AA |
2161 | } |
2162 | ||
5bb0b55a | 2163 | static struct scsi_host_template iscsi_sht = { |
f4246b33 | 2164 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
2165 | .queuecommand = iscsi_queuecommand, |
2166 | .change_queue_depth = iscsi_change_queue_depth, | |
2167 | .can_queue = ISCSI_XMIT_CMDS_MAX - 1, | |
2168 | .sg_tablesize = ISCSI_SG_TABLESIZE, | |
8231f0ed | 2169 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
2170 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
2171 | .eh_abort_handler = iscsi_eh_abort, | |
2172 | .eh_host_reset_handler = iscsi_eh_host_reset, | |
2173 | .use_clustering = DISABLE_CLUSTERING, | |
2174 | .proc_name = "iscsi_tcp", | |
2175 | .this_id = -1, | |
2176 | }; | |
2177 | ||
7ba24713 AA |
2178 | static struct iscsi_transport iscsi_tcp_transport = { |
2179 | .owner = THIS_MODULE, | |
2180 | .name = "tcp", | |
2181 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
2182 | | CAP_DATADGST, | |
fd7255f5 MC |
2183 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
2184 | ISCSI_MAX_XMIT_DLENGTH | | |
2185 | ISCSI_HDRDGST_EN | | |
2186 | ISCSI_DATADGST_EN | | |
2187 | ISCSI_INITIAL_R2T_EN | | |
2188 | ISCSI_MAX_R2T | | |
2189 | ISCSI_IMM_DATA_EN | | |
2190 | ISCSI_FIRST_BURST | | |
2191 | ISCSI_MAX_BURST | | |
2192 | ISCSI_PDU_INORDER_EN | | |
2193 | ISCSI_DATASEQ_INORDER_EN | | |
2194 | ISCSI_ERL | | |
2195 | ISCSI_CONN_PORT | | |
8d2860b3 | 2196 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
2197 | ISCSI_EXP_STATSN | |
2198 | ISCSI_PERSISTENT_PORT | | |
2199 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
2200 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
2201 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
2202 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN, | |
8ad5781a MC |
2203 | .host_param_mask = ISCSI_HOST_HWADDRESS | |
2204 | ISCSI_HOST_INITIATOR_NAME, | |
7ba24713 | 2205 | .host_template = &iscsi_sht, |
7b8631b5 | 2206 | .conndata_size = sizeof(struct iscsi_conn), |
7ba24713 AA |
2207 | .max_conn = 1, |
2208 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, | |
5bb0b55a MC |
2209 | /* session management */ |
2210 | .create_session = iscsi_tcp_session_create, | |
2211 | .destroy_session = iscsi_tcp_session_destroy, | |
2212 | /* connection management */ | |
2213 | .create_conn = iscsi_tcp_conn_create, | |
2214 | .bind_conn = iscsi_tcp_conn_bind, | |
2215 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 2216 | .set_param = iscsi_conn_set_param, |
5c75b7fc | 2217 | .get_conn_param = iscsi_tcp_conn_get_param, |
7b8631b5 | 2218 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 2219 | .start_conn = iscsi_conn_start, |
1c83469d | 2220 | .stop_conn = iscsi_tcp_conn_stop, |
0801c242 MC |
2221 | /* iscsi host params */ |
2222 | .get_host_param = iscsi_host_get_param, | |
2223 | .set_host_param = iscsi_host_set_param, | |
5bb0b55a | 2224 | /* IO */ |
7ba24713 AA |
2225 | .send_pdu = iscsi_conn_send_pdu, |
2226 | .get_stats = iscsi_conn_get_stats, | |
5bb0b55a MC |
2227 | .init_cmd_task = iscsi_tcp_cmd_init, |
2228 | .init_mgmt_task = iscsi_tcp_mgmt_init, | |
2229 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, | |
2230 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2231 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2232 | /* recovery */ | |
30a6c652 | 2233 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
2234 | }; |
2235 | ||
2236 | static int __init | |
2237 | iscsi_tcp_init(void) | |
2238 | { | |
7ba24713 | 2239 | if (iscsi_max_lun < 1) { |
be2df72e OG |
2240 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
2241 | iscsi_max_lun); | |
7ba24713 AA |
2242 | return -EINVAL; |
2243 | } | |
2244 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
2245 | ||
7b8631b5 | 2246 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
ffbfe925 | 2247 | return -ENODEV; |
7ba24713 | 2248 | |
7b8631b5 | 2249 | return 0; |
7ba24713 AA |
2250 | } |
2251 | ||
2252 | static void __exit | |
2253 | iscsi_tcp_exit(void) | |
2254 | { | |
2255 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
7ba24713 AA |
2256 | } |
2257 | ||
2258 | module_init(iscsi_tcp_init); | |
2259 | module_exit(iscsi_tcp_exit); |