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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 | ||
dbdb016d MC |
899 | if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV && |
900 | tcp_conn->in.copy) { | |
f6cfba1d | 901 | uint32_t recv_digest; |
5bb0b55a | 902 | |
7ba24713 | 903 | debug_tcp("extra data_recv offset %d copy %d\n", |
5bb0b55a | 904 | tcp_conn->in.offset, tcp_conn->in.copy); |
dbdb016d MC |
905 | |
906 | if (!tcp_conn->data_copied) { | |
907 | if (tcp_conn->in.padding) { | |
908 | debug_tcp("padding -> %d\n", | |
909 | tcp_conn->in.padding); | |
910 | memset(pad, 0, tcp_conn->in.padding); | |
911 | sg_init_one(&sg, pad, tcp_conn->in.padding); | |
912 | crypto_hash_update(&tcp_conn->rx_hash, | |
913 | &sg, sg.length); | |
914 | } | |
915 | crypto_hash_final(&tcp_conn->rx_hash, | |
916 | (u8 *) &tcp_conn->in.datadgst); | |
917 | debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); | |
918 | } | |
919 | ||
ca518684 MC |
920 | rc = iscsi_tcp_copy(conn, sizeof(uint32_t)); |
921 | if (rc) { | |
922 | if (rc == -EAGAIN) | |
923 | goto again; | |
924 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
925 | return 0; | |
926 | } | |
927 | ||
928 | memcpy(&recv_digest, conn->data, sizeof(uint32_t)); | |
5bb0b55a | 929 | if (recv_digest != tcp_conn->in.datadgst) { |
f6cfba1d MC |
930 | debug_tcp("iscsi_tcp: data digest error!" |
931 | "0x%x != 0x%x\n", recv_digest, | |
5bb0b55a | 932 | tcp_conn->in.datadgst); |
f6cfba1d MC |
933 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
934 | return 0; | |
935 | } else { | |
936 | debug_tcp("iscsi_tcp: data digest match!" | |
937 | "0x%x == 0x%x\n", recv_digest, | |
5bb0b55a MC |
938 | tcp_conn->in.datadgst); |
939 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
940 | } |
941 | } | |
942 | ||
5bb0b55a | 943 | if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && |
dbdb016d | 944 | tcp_conn->in.copy) { |
7ba24713 | 945 | debug_tcp("data_recv offset %d copy %d\n", |
5bb0b55a | 946 | tcp_conn->in.offset, tcp_conn->in.copy); |
7ba24713 AA |
947 | |
948 | rc = iscsi_data_recv(conn); | |
949 | if (rc) { | |
665b44ae | 950 | if (rc == -EAGAIN) |
7ba24713 | 951 | goto again; |
d82967c7 | 952 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
953 | return 0; |
954 | } | |
dbdb016d MC |
955 | |
956 | if (tcp_conn->in.padding) | |
957 | tcp_conn->in_progress = IN_PROGRESS_PAD_RECV; | |
958 | else if (conn->datadgst_en) | |
5bb0b55a | 959 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; |
dbdb016d MC |
960 | else |
961 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
962 | tcp_conn->data_copied = 0; | |
963 | } | |
964 | ||
965 | if (tcp_conn->in_progress == IN_PROGRESS_PAD_RECV && | |
966 | tcp_conn->in.copy) { | |
967 | int copylen = min(tcp_conn->in.padding - tcp_conn->data_copied, | |
968 | tcp_conn->in.copy); | |
969 | ||
970 | tcp_conn->in.copy -= copylen; | |
971 | tcp_conn->in.offset += copylen; | |
972 | tcp_conn->data_copied += copylen; | |
973 | ||
974 | if (tcp_conn->data_copied != tcp_conn->in.padding) | |
975 | tcp_conn->in_progress = IN_PROGRESS_PAD_RECV; | |
976 | else if (conn->datadgst_en) | |
977 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; | |
978 | else | |
5bb0b55a | 979 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
dbdb016d | 980 | tcp_conn->data_copied = 0; |
7ba24713 AA |
981 | } |
982 | ||
983 | debug_tcp("f, processed %d from out of %d padding %d\n", | |
5bb0b55a MC |
984 | tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); |
985 | BUG_ON(tcp_conn->in.offset - offset > len); | |
7ba24713 | 986 | |
5bb0b55a | 987 | if (tcp_conn->in.offset - offset != len) { |
7ba24713 | 988 | debug_tcp("continue to process %d bytes\n", |
5bb0b55a | 989 | (int)len - (tcp_conn->in.offset - offset)); |
7ba24713 AA |
990 | goto more; |
991 | } | |
992 | ||
993 | nomore: | |
5bb0b55a | 994 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
995 | BUG_ON(processed == 0); |
996 | return processed; | |
997 | ||
998 | again: | |
5bb0b55a | 999 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
1000 | debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", |
1001 | processed, (int)len, (int)rd_desc->count); | |
1002 | BUG_ON(processed == 0); | |
1003 | BUG_ON(processed > len); | |
1004 | ||
1005 | conn->rxdata_octets += processed; | |
1006 | return processed; | |
1007 | } | |
1008 | ||
1009 | static void | |
1010 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
1011 | { | |
1012 | struct iscsi_conn *conn = sk->sk_user_data; | |
1013 | read_descriptor_t rd_desc; | |
1014 | ||
1015 | read_lock(&sk->sk_callback_lock); | |
1016 | ||
665b44ae MC |
1017 | /* |
1018 | * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv. | |
1019 | * We set count to 1 because we want the network layer to | |
1020 | * hand us all the skbs that are available. iscsi_tcp_data_recv | |
1021 | * handled pdus that cross buffers or pdus that still need data. | |
1022 | */ | |
7ba24713 | 1023 | rd_desc.arg.data = conn; |
665b44ae | 1024 | rd_desc.count = 1; |
7ba24713 AA |
1025 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); |
1026 | ||
1027 | read_unlock(&sk->sk_callback_lock); | |
1028 | } | |
1029 | ||
1030 | static void | |
1031 | iscsi_tcp_state_change(struct sock *sk) | |
1032 | { | |
5bb0b55a | 1033 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
1034 | struct iscsi_conn *conn; |
1035 | struct iscsi_session *session; | |
1036 | void (*old_state_change)(struct sock *); | |
1037 | ||
1038 | read_lock(&sk->sk_callback_lock); | |
1039 | ||
1040 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
1041 | session = conn->session; | |
1042 | ||
e6273993 MC |
1043 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
1044 | sk->sk_state == TCP_CLOSE) && | |
1045 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
1046 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
1047 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1048 | } | |
1049 | ||
5bb0b55a MC |
1050 | tcp_conn = conn->dd_data; |
1051 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
1052 | |
1053 | read_unlock(&sk->sk_callback_lock); | |
1054 | ||
1055 | old_state_change(sk); | |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * iscsi_write_space - Called when more output buffer space is available | |
1060 | * @sk: socket space is available for | |
1061 | **/ | |
1062 | static void | |
1063 | iscsi_write_space(struct sock *sk) | |
1064 | { | |
1065 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1066 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1067 | ||
1068 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1069 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
55e3299d | 1070 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1071 | } |
1072 | ||
1073 | static void | |
1074 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1075 | { | |
5bb0b55a MC |
1076 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1077 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1078 | |
1079 | /* assign new callbacks */ | |
1080 | write_lock_bh(&sk->sk_callback_lock); | |
1081 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1082 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1083 | tcp_conn->old_state_change = sk->sk_state_change; | |
1084 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1085 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1086 | sk->sk_state_change = iscsi_tcp_state_change; | |
1087 | sk->sk_write_space = iscsi_write_space; | |
1088 | write_unlock_bh(&sk->sk_callback_lock); | |
1089 | } | |
1090 | ||
1091 | static void | |
1c83469d | 1092 | iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 1093 | { |
5bb0b55a | 1094 | struct sock *sk = tcp_conn->sock->sk; |
7ba24713 AA |
1095 | |
1096 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1097 | write_lock_bh(&sk->sk_callback_lock); | |
1098 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1099 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1100 | sk->sk_state_change = tcp_conn->old_state_change; | |
1101 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1102 | sk->sk_no_check = 0; |
1103 | write_unlock_bh(&sk->sk_callback_lock); | |
1104 | } | |
1105 | ||
1106 | /** | |
1107 | * iscsi_send - generic send routine | |
1108 | * @sk: kernel's socket | |
1109 | * @buf: buffer to write from | |
1110 | * @size: actual size to write | |
1111 | * @flags: socket's flags | |
7ba24713 AA |
1112 | */ |
1113 | static inline int | |
56851698 | 1114 | iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
7ba24713 | 1115 | { |
5bb0b55a MC |
1116 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1117 | struct socket *sk = tcp_conn->sock; | |
3219e529 | 1118 | int offset = buf->sg.offset + buf->sent, res; |
7ba24713 | 1119 | |
7cae5159 MC |
1120 | /* |
1121 | * if we got use_sg=0 or are sending something we kmallocd | |
1122 | * then we did not have to do kmap (kmap returns page_address) | |
1123 | * | |
1124 | * if we got use_sg > 0, but had to drop down, we do not | |
1125 | * set clustering so this should only happen for that | |
1126 | * slab case. | |
1127 | */ | |
1128 | if (buf->use_sendmsg) | |
3219e529 | 1129 | res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags); |
7cae5159 | 1130 | else |
3219e529 MC |
1131 | res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags); |
1132 | ||
1133 | if (res >= 0) { | |
1134 | conn->txdata_octets += res; | |
1135 | buf->sent += res; | |
1136 | return res; | |
1137 | } | |
1138 | ||
1139 | tcp_conn->sendpage_failures_cnt++; | |
1140 | if (res == -EAGAIN) | |
1141 | res = -ENOBUFS; | |
1142 | else | |
1143 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1144 | return res; | |
7ba24713 AA |
1145 | } |
1146 | ||
1147 | /** | |
1148 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() | |
1149 | * @conn: iscsi connection | |
1150 | * @buf: buffer to write from | |
1151 | * @datalen: lenght of data to be sent after the header | |
1152 | * | |
1153 | * Notes: | |
1154 | * (Tx, Fast Path) | |
1155 | **/ | |
1156 | static inline int | |
1157 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) | |
1158 | { | |
7ba24713 AA |
1159 | int flags = 0; /* MSG_DONTWAIT; */ |
1160 | int res, size; | |
1161 | ||
1162 | size = buf->sg.length - buf->sent; | |
1163 | BUG_ON(buf->sent + size > buf->sg.length); | |
1164 | if (buf->sent + size != buf->sg.length || datalen) | |
1165 | flags |= MSG_MORE; | |
1166 | ||
56851698 | 1167 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1168 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
1169 | if (res >= 0) { | |
7ba24713 AA |
1170 | if (size != res) |
1171 | return -EAGAIN; | |
1172 | return 0; | |
3219e529 | 1173 | } |
7ba24713 AA |
1174 | |
1175 | return res; | |
1176 | } | |
1177 | ||
1178 | /** | |
1179 | * iscsi_sendpage - send one page of iSCSI Data-Out. | |
1180 | * @conn: iscsi connection | |
1181 | * @buf: buffer to write from | |
1182 | * @count: remaining data | |
1183 | * @sent: number of bytes sent | |
1184 | * | |
1185 | * Notes: | |
1186 | * (Tx, Fast Path) | |
1187 | **/ | |
1188 | static inline int | |
1189 | iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, | |
1190 | int *count, int *sent) | |
1191 | { | |
7ba24713 AA |
1192 | int flags = 0; /* MSG_DONTWAIT; */ |
1193 | int res, size; | |
1194 | ||
1195 | size = buf->sg.length - buf->sent; | |
1196 | BUG_ON(buf->sent + size > buf->sg.length); | |
1197 | if (size > *count) | |
1198 | size = *count; | |
b13941f6 | 1199 | if (buf->sent + size != buf->sg.length || *count != size) |
7ba24713 AA |
1200 | flags |= MSG_MORE; |
1201 | ||
56851698 | 1202 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1203 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
1204 | size, buf->sent, *count, *sent, res); | |
1205 | if (res >= 0) { | |
7ba24713 AA |
1206 | *count -= res; |
1207 | *sent += res; | |
1208 | if (size != res) | |
1209 | return -EAGAIN; | |
1210 | return 0; | |
3219e529 | 1211 | } |
7ba24713 AA |
1212 | |
1213 | return res; | |
1214 | } | |
1215 | ||
1216 | static inline void | |
5bb0b55a | 1217 | iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
62f38300 | 1218 | struct iscsi_tcp_cmd_task *tcp_ctask) |
7ba24713 | 1219 | { |
c9802cd9 | 1220 | crypto_hash_init(&tcp_conn->tx_hash); |
5bb0b55a | 1221 | tcp_ctask->digest_count = 4; |
7ba24713 AA |
1222 | } |
1223 | ||
7ba24713 AA |
1224 | /** |
1225 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1226 | * @conn: iscsi connection | |
1227 | * @ctask: scsi command task | |
1228 | * @r2t: R2T info | |
1229 | * @left: bytes left to transfer | |
1230 | * | |
1231 | * Notes: | |
1232 | * Initialize next Data-Out within this R2T sequence and continue | |
1233 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1234 | * | |
1235 | * Called under connection lock. | |
1236 | **/ | |
1237 | static void | |
1238 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1239 | struct iscsi_r2t_info *r2t, int left) | |
1240 | { | |
1241 | struct iscsi_data *hdr; | |
7ba24713 AA |
1242 | struct scsi_cmnd *sc = ctask->sc; |
1243 | int new_offset; | |
1244 | ||
ffbfe925 | 1245 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
1246 | memset(hdr, 0, sizeof(struct iscsi_data)); |
1247 | hdr->ttt = r2t->ttt; | |
1248 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1249 | r2t->solicit_datasn++; | |
1250 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
1251 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
1252 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
1253 | hdr->exp_statsn = r2t->exp_statsn; |
1254 | new_offset = r2t->data_offset + r2t->sent; | |
1255 | hdr->offset = cpu_to_be32(new_offset); | |
1256 | if (left > conn->max_xmit_dlength) { | |
1257 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1258 | r2t->data_count = conn->max_xmit_dlength; | |
1259 | } else { | |
1260 | hton24(hdr->dlength, left); | |
1261 | r2t->data_count = left; | |
1262 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1263 | } | |
1264 | conn->dataout_pdus_cnt++; | |
1265 | ||
6e458cc9 | 1266 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 1267 | sizeof(struct iscsi_hdr)); |
7ba24713 | 1268 | |
62f38300 MC |
1269 | if (iscsi_buf_left(&r2t->sendbuf)) |
1270 | return; | |
1271 | ||
1272 | if (sc->use_sg) { | |
7ba24713 AA |
1273 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1274 | r2t->sg += 1; | |
62f38300 MC |
1275 | } else { |
1276 | iscsi_buf_init_iov(&r2t->sendbuf, | |
7ba24713 AA |
1277 | (char*)sc->request_buffer + new_offset, |
1278 | r2t->data_count); | |
62f38300 MC |
1279 | r2t->sg = NULL; |
1280 | } | |
7ba24713 AA |
1281 | } |
1282 | ||
62f38300 MC |
1283 | static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask, |
1284 | unsigned long len) | |
7ba24713 | 1285 | { |
62f38300 MC |
1286 | tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1); |
1287 | if (!tcp_ctask->pad_count) | |
1288 | return; | |
7ba24713 | 1289 | |
62f38300 MC |
1290 | tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count; |
1291 | debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count); | |
1292 | tcp_ctask->xmstate |= XMSTATE_W_PAD; | |
7ba24713 AA |
1293 | } |
1294 | ||
1295 | /** | |
5bb0b55a | 1296 | * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 AA |
1297 | * @conn: iscsi connection |
1298 | * @ctask: scsi command task | |
1299 | * @sc: scsi command | |
1300 | **/ | |
1301 | static void | |
5bb0b55a | 1302 | iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
7ba24713 | 1303 | { |
5bb0b55a | 1304 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1305 | |
5bb0b55a | 1306 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
218432c6 | 1307 | tcp_ctask->xmstate = XMSTATE_CMD_HDR_INIT; |
7ba24713 AA |
1308 | } |
1309 | ||
1310 | /** | |
5bb0b55a | 1311 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
7ba24713 AA |
1312 | * @conn: iscsi connection |
1313 | * @mtask: task management task | |
1314 | * | |
1315 | * Notes: | |
1316 | * The function can return -EAGAIN in which case caller must | |
1317 | * call it again later, or recover. '0' return code means successful | |
1318 | * xmit. | |
1319 | * | |
218432c6 MC |
1320 | * Management xmit state machine consists of these states: |
1321 | * XMSTATE_IMM_HDR_INIT - calculate digest of PDU Header | |
1322 | * XMSTATE_IMM_HDR - PDU Header xmit in progress | |
1323 | * XMSTATE_IMM_DATA - PDU Data xmit in progress | |
1324 | * XMSTATE_IDLE - management PDU is done | |
7ba24713 AA |
1325 | **/ |
1326 | static int | |
5bb0b55a | 1327 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1328 | { |
5bb0b55a | 1329 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
3219e529 | 1330 | int rc; |
7ba24713 AA |
1331 | |
1332 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", | |
5bb0b55a | 1333 | conn->id, tcp_mtask->xmstate, mtask->itt); |
7ba24713 | 1334 | |
218432c6 MC |
1335 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR_INIT) { |
1336 | iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr, | |
1337 | sizeof(struct iscsi_hdr)); | |
1338 | ||
1339 | if (mtask->data_count) { | |
5bb0b55a | 1340 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
218432c6 MC |
1341 | iscsi_buf_init_iov(&tcp_mtask->sendbuf, |
1342 | (char*)mtask->data, | |
1343 | mtask->data_count); | |
1344 | } | |
1345 | ||
af973481 | 1346 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
30a6c652 | 1347 | conn->stop_stage != STOP_CONN_RECOVER && |
af973481 | 1348 | conn->hdrdgst_en) |
5bb0b55a MC |
1349 | iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
1350 | (u8*)tcp_mtask->hdrext); | |
218432c6 MC |
1351 | |
1352 | tcp_mtask->sent = 0; | |
1353 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR_INIT; | |
1354 | tcp_mtask->xmstate |= XMSTATE_IMM_HDR; | |
1355 | } | |
1356 | ||
1357 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { | |
3219e529 MC |
1358 | rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf, |
1359 | mtask->data_count); | |
218432c6 | 1360 | if (rc) |
3219e529 | 1361 | return rc; |
218432c6 | 1362 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; |
7ba24713 AA |
1363 | } |
1364 | ||
5bb0b55a | 1365 | if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 | 1366 | BUG_ON(!mtask->data_count); |
5bb0b55a | 1367 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1368 | /* FIXME: implement. |
1369 | * Virtual buffer could be spreaded across multiple pages... | |
1370 | */ | |
1371 | do { | |
3219e529 MC |
1372 | int rc; |
1373 | ||
1374 | rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf, | |
1375 | &mtask->data_count, &tcp_mtask->sent); | |
1376 | if (rc) { | |
5bb0b55a | 1377 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
3219e529 | 1378 | return rc; |
7ba24713 AA |
1379 | } |
1380 | } while (mtask->data_count); | |
1381 | } | |
1382 | ||
5bb0b55a | 1383 | BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
b4377356 | 1384 | if (mtask->hdr->itt == RESERVED_ITT) { |
5bb0b55a MC |
1385 | struct iscsi_session *session = conn->session; |
1386 | ||
1387 | spin_lock_bh(&session->lock); | |
1388 | list_del(&conn->mtask->running); | |
1389 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, | |
1390 | sizeof(void*)); | |
1391 | spin_unlock_bh(&session->lock); | |
1392 | } | |
7ba24713 AA |
1393 | return 0; |
1394 | } | |
1395 | ||
218432c6 MC |
1396 | static int |
1397 | iscsi_send_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1398 | { |
218432c6 MC |
1399 | struct scsi_cmnd *sc = ctask->sc; |
1400 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1401 | int rc = 0; | |
3219e529 | 1402 | |
218432c6 MC |
1403 | if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_INIT) { |
1404 | tcp_ctask->sent = 0; | |
1405 | tcp_ctask->sg_count = 0; | |
1406 | tcp_ctask->exp_datasn = 0; | |
1407 | ||
1408 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
1409 | if (sc->use_sg) { | |
1410 | struct scatterlist *sg = sc->request_buffer; | |
1411 | ||
1412 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg); | |
1413 | tcp_ctask->sg = sg + 1; | |
1414 | tcp_ctask->bad_sg = sg + sc->use_sg; | |
1415 | } else { | |
1416 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, | |
1417 | sc->request_buffer, | |
1418 | sc->request_bufflen); | |
1419 | tcp_ctask->sg = NULL; | |
1420 | tcp_ctask->bad_sg = NULL; | |
1421 | } | |
7ba24713 | 1422 | |
218432c6 MC |
1423 | debug_scsi("cmd [itt 0x%x total %d imm_data %d " |
1424 | "unsol count %d, unsol offset %d]\n", | |
1425 | ctask->itt, sc->request_bufflen, | |
1426 | ctask->imm_count, ctask->unsol_count, | |
1427 | ctask->unsol_offset); | |
1428 | } | |
5bb0b55a | 1429 | |
218432c6 MC |
1430 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, |
1431 | sizeof(struct iscsi_hdr)); | |
1432 | ||
1433 | if (conn->hdrdgst_en) | |
1434 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, | |
1435 | (u8*)tcp_ctask->hdrext); | |
1436 | tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_INIT; | |
1437 | tcp_ctask->xmstate |= XMSTATE_CMD_HDR_XMIT; | |
62f38300 MC |
1438 | } |
1439 | ||
218432c6 MC |
1440 | if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_XMIT) { |
1441 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count); | |
1442 | if (rc) | |
1443 | return rc; | |
1444 | tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_XMIT; | |
1445 | ||
1446 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
1447 | return 0; | |
1448 | ||
1449 | if (ctask->imm_count) { | |
1450 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; | |
1451 | iscsi_set_padding(tcp_ctask, ctask->imm_count); | |
62f38300 | 1452 | |
218432c6 MC |
1453 | if (ctask->conn->datadgst_en) { |
1454 | iscsi_data_digest_init(ctask->conn->dd_data, | |
1455 | tcp_ctask); | |
1456 | tcp_ctask->immdigest = 0; | |
1457 | } | |
62f38300 | 1458 | } |
62f38300 | 1459 | |
218432c6 MC |
1460 | if (ctask->unsol_count) |
1461 | tcp_ctask->xmstate |= | |
1462 | XMSTATE_UNS_HDR | XMSTATE_UNS_INIT; | |
1463 | } | |
1464 | return rc; | |
7ba24713 AA |
1465 | } |
1466 | ||
62f38300 MC |
1467 | static int |
1468 | iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1469 | { |
5bb0b55a | 1470 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
62f38300 MC |
1471 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1472 | int sent = 0, rc; | |
5bb0b55a | 1473 | |
62f38300 MC |
1474 | if (tcp_ctask->xmstate & XMSTATE_W_PAD) { |
1475 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, | |
1476 | tcp_ctask->pad_count); | |
1477 | if (conn->datadgst_en) | |
c9802cd9 JB |
1478 | crypto_hash_update(&tcp_conn->tx_hash, |
1479 | &tcp_ctask->sendbuf.sg, | |
1480 | tcp_ctask->sendbuf.sg.length); | |
62f38300 MC |
1481 | } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD)) |
1482 | return 0; | |
1483 | ||
1484 | tcp_ctask->xmstate &= ~XMSTATE_W_PAD; | |
1485 | tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD; | |
1486 | debug_scsi("sending %d pad bytes for itt 0x%x\n", | |
1487 | tcp_ctask->pad_count, ctask->itt); | |
1488 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, | |
1489 | &sent); | |
3219e529 | 1490 | if (rc) { |
62f38300 MC |
1491 | debug_scsi("padding send failed %d\n", rc); |
1492 | tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD; | |
7ba24713 | 1493 | } |
3219e529 | 1494 | return rc; |
7ba24713 AA |
1495 | } |
1496 | ||
62f38300 MC |
1497 | static int |
1498 | iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1499 | struct iscsi_buf *buf, uint32_t *digest) | |
7ba24713 | 1500 | { |
62f38300 MC |
1501 | struct iscsi_tcp_cmd_task *tcp_ctask; |
1502 | struct iscsi_tcp_conn *tcp_conn; | |
1503 | int rc, sent = 0; | |
5bb0b55a | 1504 | |
62f38300 MC |
1505 | if (!conn->datadgst_en) |
1506 | return 0; | |
7ba24713 | 1507 | |
62f38300 MC |
1508 | tcp_ctask = ctask->dd_data; |
1509 | tcp_conn = conn->dd_data; | |
7ba24713 | 1510 | |
62f38300 | 1511 | if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) { |
c9802cd9 | 1512 | crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest); |
62f38300 MC |
1513 | iscsi_buf_init_iov(buf, (char*)digest, 4); |
1514 | } | |
1515 | tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST; | |
7ba24713 | 1516 | |
62f38300 MC |
1517 | rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
1518 | if (!rc) | |
1519 | debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest, | |
1520 | ctask->itt); | |
1521 | else { | |
1522 | debug_scsi("sending digest 0x%x failed for itt 0x%x!\n", | |
1523 | *digest, ctask->itt); | |
1524 | tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST; | |
7ba24713 | 1525 | } |
62f38300 MC |
1526 | return rc; |
1527 | } | |
7ba24713 | 1528 | |
62f38300 MC |
1529 | static int |
1530 | iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf, | |
1531 | struct scatterlist **sg, int *sent, int *count, | |
1532 | struct iscsi_buf *digestbuf, uint32_t *digest) | |
1533 | { | |
1534 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1535 | struct iscsi_conn *conn = ctask->conn; | |
1536 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1537 | int rc, buf_sent, offset; | |
1538 | ||
1539 | while (*count) { | |
1540 | buf_sent = 0; | |
1541 | offset = sendbuf->sent; | |
1542 | ||
1543 | rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent); | |
1544 | *sent = *sent + buf_sent; | |
1545 | if (buf_sent && conn->datadgst_en) | |
c9802cd9 | 1546 | partial_sg_digest_update(&tcp_conn->tx_hash, |
62f38300 MC |
1547 | &sendbuf->sg, sendbuf->sg.offset + offset, |
1548 | buf_sent); | |
1549 | if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) { | |
1550 | iscsi_buf_init_sg(sendbuf, *sg); | |
1551 | *sg = *sg + 1; | |
7ba24713 | 1552 | } |
62f38300 MC |
1553 | |
1554 | if (rc) | |
1555 | return rc; | |
7ba24713 AA |
1556 | } |
1557 | ||
62f38300 MC |
1558 | rc = iscsi_send_padding(conn, ctask); |
1559 | if (rc) | |
1560 | return rc; | |
1561 | ||
1562 | return iscsi_send_digest(conn, ctask, digestbuf, digest); | |
7ba24713 AA |
1563 | } |
1564 | ||
62f38300 MC |
1565 | static int |
1566 | iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1567 | { |
5bb0b55a | 1568 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1569 | struct iscsi_data_task *dtask; |
3219e529 | 1570 | int rc; |
7ba24713 | 1571 | |
5bb0b55a MC |
1572 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
1573 | if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { | |
62f38300 MC |
1574 | dtask = &tcp_ctask->unsol_dtask; |
1575 | ||
ffd0436e MC |
1576 | iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr); |
1577 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, | |
1578 | sizeof(struct iscsi_hdr)); | |
af973481 | 1579 | if (conn->hdrdgst_en) |
5bb0b55a | 1580 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
af973481 | 1581 | (u8*)dtask->hdrext); |
62f38300 | 1582 | |
5bb0b55a | 1583 | tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
62f38300 | 1584 | iscsi_set_padding(tcp_ctask, ctask->data_count); |
7ba24713 | 1585 | } |
3219e529 MC |
1586 | |
1587 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count); | |
1588 | if (rc) { | |
5bb0b55a MC |
1589 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
1590 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR; | |
3219e529 | 1591 | return rc; |
7ba24713 AA |
1592 | } |
1593 | ||
dd8c0d95 MC |
1594 | if (conn->datadgst_en) { |
1595 | dtask = &tcp_ctask->unsol_dtask; | |
1596 | iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask); | |
1597 | dtask->digest = 0; | |
1598 | } | |
1599 | ||
7ba24713 | 1600 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", |
5bb0b55a | 1601 | ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
7ba24713 AA |
1602 | return 0; |
1603 | } | |
1604 | ||
62f38300 MC |
1605 | static int |
1606 | iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1607 | { |
5bb0b55a | 1608 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1609 | int rc; |
7ba24713 | 1610 | |
62f38300 MC |
1611 | if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
1612 | BUG_ON(!ctask->unsol_count); | |
1613 | tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; | |
1614 | send_hdr: | |
1615 | rc = iscsi_send_unsol_hdr(conn, ctask); | |
1616 | if (rc) | |
1617 | return rc; | |
7ba24713 AA |
1618 | } |
1619 | ||
62f38300 MC |
1620 | if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
1621 | struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask; | |
5bb0b55a | 1622 | int start = tcp_ctask->sent; |
7ba24713 | 1623 | |
62f38300 MC |
1624 | rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg, |
1625 | &tcp_ctask->sent, &ctask->data_count, | |
1626 | &dtask->digestbuf, &dtask->digest); | |
5bb0b55a | 1627 | ctask->unsol_count -= tcp_ctask->sent - start; |
62f38300 MC |
1628 | if (rc) |
1629 | return rc; | |
1630 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; | |
7ba24713 | 1631 | /* |
62f38300 MC |
1632 | * Done with the Data-Out. Next, check if we need |
1633 | * to send another unsolicited Data-Out. | |
7ba24713 | 1634 | */ |
62f38300 MC |
1635 | if (ctask->unsol_count) { |
1636 | debug_scsi("sending more uns\n"); | |
1637 | tcp_ctask->xmstate |= XMSTATE_UNS_INIT; | |
1638 | goto send_hdr; | |
7ba24713 | 1639 | } |
7ba24713 | 1640 | } |
7ba24713 AA |
1641 | return 0; |
1642 | } | |
1643 | ||
62f38300 MC |
1644 | static int iscsi_send_sol_pdu(struct iscsi_conn *conn, |
1645 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1646 | { |
5bb0b55a | 1647 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
62f38300 MC |
1648 | struct iscsi_session *session = conn->session; |
1649 | struct iscsi_r2t_info *r2t; | |
1650 | struct iscsi_data_task *dtask; | |
3219e529 | 1651 | int left, rc; |
7ba24713 | 1652 | |
218432c6 | 1653 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR_INIT) { |
db37c505 MC |
1654 | if (!tcp_ctask->r2t) { |
1655 | spin_lock_bh(&session->lock); | |
62f38300 MC |
1656 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, |
1657 | sizeof(void*)); | |
db37c505 MC |
1658 | spin_unlock_bh(&session->lock); |
1659 | } | |
62f38300 MC |
1660 | send_hdr: |
1661 | r2t = tcp_ctask->r2t; | |
1662 | dtask = &r2t->dtask; | |
7ba24713 | 1663 | |
62f38300 MC |
1664 | if (conn->hdrdgst_en) |
1665 | iscsi_hdr_digest(conn, &r2t->headbuf, | |
1666 | (u8*)dtask->hdrext); | |
218432c6 MC |
1667 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR_INIT; |
1668 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
1669 | } | |
1670 | ||
1671 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { | |
1672 | r2t = tcp_ctask->r2t; | |
1673 | dtask = &r2t->dtask; | |
1674 | ||
62f38300 | 1675 | rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count); |
218432c6 | 1676 | if (rc) |
3219e529 | 1677 | return rc; |
218432c6 MC |
1678 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
1679 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
7ba24713 | 1680 | |
7ba24713 | 1681 | if (conn->datadgst_en) { |
dd8c0d95 MC |
1682 | iscsi_data_digest_init(conn->dd_data, tcp_ctask); |
1683 | dtask->digest = 0; | |
7ba24713 | 1684 | } |
7ba24713 | 1685 | |
62f38300 MC |
1686 | iscsi_set_padding(tcp_ctask, r2t->data_count); |
1687 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", | |
1688 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, | |
1689 | r2t->sent); | |
7ba24713 AA |
1690 | } |
1691 | ||
62f38300 MC |
1692 | if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
1693 | r2t = tcp_ctask->r2t; | |
1694 | dtask = &r2t->dtask; | |
7ba24713 | 1695 | |
62f38300 MC |
1696 | rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg, |
1697 | &r2t->sent, &r2t->data_count, | |
1698 | &dtask->digestbuf, &dtask->digest); | |
1699 | if (rc) | |
1700 | return rc; | |
1701 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; | |
7ba24713 | 1702 | |
62f38300 MC |
1703 | /* |
1704 | * Done with this Data-Out. Next, check if we have | |
1705 | * to send another Data-Out for this R2T. | |
1706 | */ | |
1707 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1708 | left = r2t->data_length - r2t->sent; | |
1709 | if (left) { | |
1710 | iscsi_solicit_data_cont(conn, ctask, r2t, left); | |
62f38300 MC |
1711 | goto send_hdr; |
1712 | } | |
7ba24713 | 1713 | |
62f38300 MC |
1714 | /* |
1715 | * Done with this R2T. Check if there are more | |
1716 | * outstanding R2Ts ready to be processed. | |
1717 | */ | |
1718 | spin_lock_bh(&session->lock); | |
1719 | tcp_ctask->r2t = NULL; | |
1720 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
1721 | sizeof(void*)); | |
1722 | if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, | |
1723 | sizeof(void*))) { | |
1724 | tcp_ctask->r2t = r2t; | |
62f38300 MC |
1725 | spin_unlock_bh(&session->lock); |
1726 | goto send_hdr; | |
7ba24713 | 1727 | } |
62f38300 | 1728 | spin_unlock_bh(&session->lock); |
7ba24713 | 1729 | } |
7ba24713 AA |
1730 | return 0; |
1731 | } | |
1732 | ||
218432c6 MC |
1733 | /** |
1734 | * iscsi_tcp_ctask_xmit - xmit normal PDU task | |
1735 | * @conn: iscsi connection | |
1736 | * @ctask: iscsi command task | |
1737 | * | |
1738 | * Notes: | |
1739 | * The function can return -EAGAIN in which case caller must | |
1740 | * call it again later, or recover. '0' return code means successful | |
1741 | * xmit. | |
1742 | * The function is devided to logical helpers (above) for the different | |
1743 | * xmit stages. | |
1744 | * | |
1745 | *iscsi_send_cmd_hdr() | |
1746 | * XMSTATE_CMD_HDR_INIT - prepare Header and Data buffers Calculate | |
1747 | * Header Digest | |
1748 | * XMSTATE_CMD_HDR_XMIT - Transmit header in progress | |
1749 | * | |
1750 | *iscsi_send_padding | |
1751 | * XMSTATE_W_PAD - Prepare and send pading | |
1752 | * XMSTATE_W_RESEND_PAD - retry send pading | |
1753 | * | |
1754 | *iscsi_send_digest | |
1755 | * XMSTATE_W_RESEND_DATA_DIGEST - Finalize and send Data Digest | |
1756 | * XMSTATE_W_RESEND_DATA_DIGEST - retry sending digest | |
1757 | * | |
1758 | *iscsi_send_unsol_hdr | |
1759 | * XMSTATE_UNS_INIT - prepare un-solicit data header and digest | |
1760 | * XMSTATE_UNS_HDR - send un-solicit header | |
1761 | * | |
1762 | *iscsi_send_unsol_pdu | |
1763 | * XMSTATE_UNS_DATA - send un-solicit data in progress | |
1764 | * | |
1765 | *iscsi_send_sol_pdu | |
1766 | * XMSTATE_SOL_HDR_INIT - solicit data header and digest initialize | |
1767 | * XMSTATE_SOL_HDR - send solicit header | |
1768 | * XMSTATE_SOL_DATA - send solicit data | |
1769 | * | |
1770 | *iscsi_tcp_ctask_xmit | |
1771 | * XMSTATE_IMM_DATA - xmit managment data (??) | |
1772 | **/ | |
7ba24713 | 1773 | static int |
5bb0b55a | 1774 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 1775 | { |
5bb0b55a | 1776 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1777 | int rc = 0; |
1778 | ||
1779 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", | |
5bb0b55a | 1780 | conn->id, tcp_ctask->xmstate, ctask->itt); |
7ba24713 | 1781 | |
218432c6 MC |
1782 | rc = iscsi_send_cmd_hdr(conn, ctask); |
1783 | if (rc) | |
1784 | return rc; | |
1785 | if (ctask->sc->sc_data_direction != DMA_TO_DEVICE) | |
1786 | return 0; | |
7ba24713 | 1787 | |
5bb0b55a | 1788 | if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
62f38300 MC |
1789 | rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg, |
1790 | &tcp_ctask->sent, &ctask->imm_count, | |
1791 | &tcp_ctask->immbuf, &tcp_ctask->immdigest); | |
7ba24713 AA |
1792 | if (rc) |
1793 | return rc; | |
62f38300 | 1794 | tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1795 | } |
1796 | ||
62f38300 MC |
1797 | rc = iscsi_send_unsol_pdu(conn, ctask); |
1798 | if (rc) | |
1799 | return rc; | |
7ba24713 | 1800 | |
62f38300 MC |
1801 | rc = iscsi_send_sol_pdu(conn, ctask); |
1802 | if (rc) | |
1803 | return rc; | |
7ba24713 AA |
1804 | |
1805 | return rc; | |
1806 | } | |
1807 | ||
5bb0b55a MC |
1808 | static struct iscsi_cls_conn * |
1809 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1810 | { |
5bb0b55a MC |
1811 | struct iscsi_conn *conn; |
1812 | struct iscsi_cls_conn *cls_conn; | |
1813 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1814 | |
5bb0b55a MC |
1815 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
1816 | if (!cls_conn) | |
1817 | return NULL; | |
1818 | conn = cls_conn->dd_data; | |
7ba24713 | 1819 | /* |
5bb0b55a MC |
1820 | * due to strange issues with iser these are not set |
1821 | * in iscsi_conn_setup | |
7ba24713 | 1822 | */ |
bf32ed33 | 1823 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; |
7ba24713 | 1824 | |
5bb0b55a MC |
1825 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
1826 | if (!tcp_conn) | |
1827 | goto tcp_conn_alloc_fail; | |
7ba24713 | 1828 | |
5bb0b55a MC |
1829 | conn->dd_data = tcp_conn; |
1830 | tcp_conn->iscsi_conn = conn; | |
1831 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
1832 | /* initial operational parameters */ | |
1833 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); | |
7ba24713 | 1834 | |
c9802cd9 JB |
1835 | tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1836 | CRYPTO_ALG_ASYNC); | |
1837 | tcp_conn->tx_hash.flags = 0; | |
0f238418 MC |
1838 | if (IS_ERR(tcp_conn->tx_hash.tfm)) { |
1839 | printk(KERN_ERR "Could not create connection due to crc32c " | |
1840 | "loading error %ld. Make sure the crc32c module is " | |
1841 | "built as a module or into the kernel\n", | |
1842 | PTR_ERR(tcp_conn->tx_hash.tfm)); | |
dd8c0d95 | 1843 | goto free_tcp_conn; |
0f238418 | 1844 | } |
dd8c0d95 | 1845 | |
c9802cd9 JB |
1846 | tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1847 | CRYPTO_ALG_ASYNC); | |
1848 | tcp_conn->rx_hash.flags = 0; | |
0f238418 MC |
1849 | if (IS_ERR(tcp_conn->rx_hash.tfm)) { |
1850 | printk(KERN_ERR "Could not create connection due to crc32c " | |
1851 | "loading error %ld. Make sure the crc32c module is " | |
1852 | "built as a module or into the kernel\n", | |
1853 | PTR_ERR(tcp_conn->rx_hash.tfm)); | |
dd8c0d95 | 1854 | goto free_tx_tfm; |
0f238418 | 1855 | } |
dd8c0d95 | 1856 | |
5bb0b55a | 1857 | return cls_conn; |
7ba24713 | 1858 | |
dd8c0d95 | 1859 | free_tx_tfm: |
c9802cd9 | 1860 | crypto_free_hash(tcp_conn->tx_hash.tfm); |
dd8c0d95 MC |
1861 | free_tcp_conn: |
1862 | kfree(tcp_conn); | |
5bb0b55a MC |
1863 | tcp_conn_alloc_fail: |
1864 | iscsi_conn_teardown(cls_conn); | |
1865 | return NULL; | |
7ba24713 AA |
1866 | } |
1867 | ||
1c83469d MC |
1868 | static void |
1869 | iscsi_tcp_release_conn(struct iscsi_conn *conn) | |
1870 | { | |
1871 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1872 | ||
1873 | if (!tcp_conn->sock) | |
1874 | return; | |
1875 | ||
1876 | sock_hold(tcp_conn->sock->sk); | |
1877 | iscsi_conn_restore_callbacks(tcp_conn); | |
1878 | sock_put(tcp_conn->sock->sk); | |
1879 | ||
1880 | sock_release(tcp_conn->sock); | |
1881 | tcp_conn->sock = NULL; | |
1882 | conn->recv_lock = NULL; | |
1883 | } | |
1884 | ||
7ba24713 | 1885 | static void |
5bb0b55a | 1886 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1887 | { |
5bb0b55a MC |
1888 | struct iscsi_conn *conn = cls_conn->dd_data; |
1889 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 | 1890 | |
1c83469d | 1891 | iscsi_tcp_release_conn(conn); |
5bb0b55a | 1892 | iscsi_conn_teardown(cls_conn); |
7ba24713 | 1893 | |
534284a0 PW |
1894 | if (tcp_conn->tx_hash.tfm) |
1895 | crypto_free_hash(tcp_conn->tx_hash.tfm); | |
1896 | if (tcp_conn->rx_hash.tfm) | |
1897 | crypto_free_hash(tcp_conn->rx_hash.tfm); | |
7ba24713 | 1898 | |
5bb0b55a MC |
1899 | kfree(tcp_conn); |
1900 | } | |
7ba24713 | 1901 | |
1c83469d MC |
1902 | static void |
1903 | iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1904 | { | |
1905 | struct iscsi_conn *conn = cls_conn->dd_data; | |
d5390f5f | 1906 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1c83469d MC |
1907 | |
1908 | iscsi_conn_stop(cls_conn, flag); | |
1909 | iscsi_tcp_release_conn(conn); | |
d5390f5f | 1910 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
1c83469d MC |
1911 | } |
1912 | ||
5bb0b55a MC |
1913 | static int |
1914 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1915 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1916 | int is_leading) |
1917 | { | |
1918 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1919 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1920 | struct sock *sk; | |
1921 | struct socket *sock; | |
1922 | int err; | |
7ba24713 | 1923 | |
5bb0b55a | 1924 | /* lookup for existing socket */ |
264faaaa | 1925 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a MC |
1926 | if (!sock) { |
1927 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); | |
1928 | return -EEXIST; | |
7ba24713 AA |
1929 | } |
1930 | ||
5bb0b55a MC |
1931 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
1932 | if (err) | |
1933 | return err; | |
7ba24713 | 1934 | |
67a61114 MC |
1935 | /* bind iSCSI connection and socket */ |
1936 | tcp_conn->sock = sock; | |
7ba24713 | 1937 | |
67a61114 MC |
1938 | /* setup Socket parameters */ |
1939 | sk = sock->sk; | |
1940 | sk->sk_reuse = 1; | |
1941 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
1942 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 1943 | |
67a61114 | 1944 | /* FIXME: disable Nagle's algorithm */ |
7ba24713 | 1945 | |
67a61114 MC |
1946 | /* |
1947 | * Intercept TCP callbacks for sendfile like receive | |
1948 | * processing. | |
1949 | */ | |
1950 | conn->recv_lock = &sk->sk_callback_lock; | |
1951 | iscsi_conn_set_callbacks(conn); | |
1952 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; | |
1953 | /* | |
1954 | * set receive state machine into initial state | |
1955 | */ | |
1956 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 | 1957 | |
7ba24713 AA |
1958 | return 0; |
1959 | } | |
1960 | ||
5bb0b55a | 1961 | /* called with host lock */ |
30a6c652 | 1962 | static void |
77a23c21 | 1963 | iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1964 | { |
5bb0b55a | 1965 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
218432c6 | 1966 | tcp_mtask->xmstate = XMSTATE_IMM_HDR_INIT; |
7ba24713 AA |
1967 | } |
1968 | ||
1969 | static int | |
1970 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
1971 | { | |
1972 | int i; | |
1973 | int cmd_i; | |
1974 | ||
1975 | /* | |
1976 | * initialize per-task: R2T pool and xmit queue | |
1977 | */ | |
1978 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1979 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
5bb0b55a | 1980 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1981 | |
1982 | /* | |
1983 | * pre-allocated x4 as much r2ts to handle race when | |
1984 | * target acks DataOut faster than we data_xmit() queues | |
1985 | * could replenish r2tqueue. | |
1986 | */ | |
1987 | ||
1988 | /* R2T pool */ | |
5bb0b55a MC |
1989 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
1990 | (void***)&tcp_ctask->r2ts, | |
1991 | sizeof(struct iscsi_r2t_info))) { | |
7ba24713 AA |
1992 | goto r2t_alloc_fail; |
1993 | } | |
1994 | ||
1995 | /* R2T xmit queue */ | |
5bb0b55a | 1996 | tcp_ctask->r2tqueue = kfifo_alloc( |
7ba24713 | 1997 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
5bb0b55a MC |
1998 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
1999 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2000 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2001 | goto r2t_alloc_fail; |
2002 | } | |
7ba24713 AA |
2003 | } |
2004 | ||
2005 | return 0; | |
2006 | ||
2007 | r2t_alloc_fail: | |
2008 | for (i = 0; i < cmd_i; i++) { | |
5bb0b55a MC |
2009 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2010 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2011 | ||
5bb0b55a MC |
2012 | kfifo_free(tcp_ctask->r2tqueue); |
2013 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2014 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2015 | } |
2016 | return -ENOMEM; | |
2017 | } | |
2018 | ||
2019 | static void | |
2020 | iscsi_r2tpool_free(struct iscsi_session *session) | |
2021 | { | |
2022 | int i; | |
2023 | ||
2024 | for (i = 0; i < session->cmds_max; i++) { | |
5bb0b55a MC |
2025 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2026 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 2027 | |
5bb0b55a MC |
2028 | kfifo_free(tcp_ctask->r2tqueue); |
2029 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2030 | (void**)tcp_ctask->r2ts); | |
7ba24713 | 2031 | } |
7ba24713 AA |
2032 | } |
2033 | ||
2034 | static int | |
7b7232f3 | 2035 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
5c75b7fc | 2036 | char *buf, int buflen) |
7ba24713 | 2037 | { |
7b7232f3 | 2038 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 2039 | struct iscsi_session *session = conn->session; |
5bb0b55a | 2040 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5c75b7fc | 2041 | int value; |
7ba24713 | 2042 | |
7ba24713 | 2043 | switch(param) { |
7ba24713 | 2044 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 2045 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a | 2046 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
dd8c0d95 | 2047 | if (conn->hdrdgst_en) |
5bb0b55a | 2048 | tcp_conn->hdr_size += sizeof(__u32); |
7ba24713 AA |
2049 | break; |
2050 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 2051 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a MC |
2052 | tcp_conn->sendpage = conn->datadgst_en ? |
2053 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 | 2054 | break; |
7ba24713 | 2055 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 2056 | sscanf(buf, "%d", &value); |
7ba24713 AA |
2057 | if (session->max_r2t == roundup_pow_of_two(value)) |
2058 | break; | |
2059 | iscsi_r2tpool_free(session); | |
5c75b7fc | 2060 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2061 | if (session->max_r2t & (session->max_r2t - 1)) |
2062 | session->max_r2t = roundup_pow_of_two(session->max_r2t); | |
2063 | if (iscsi_r2tpool_alloc(session)) | |
2064 | return -ENOMEM; | |
2065 | break; | |
7ba24713 | 2066 | default: |
5c75b7fc | 2067 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2068 | } |
2069 | ||
2070 | return 0; | |
2071 | } | |
2072 | ||
2073 | static int | |
5c75b7fc MC |
2074 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
2075 | enum iscsi_param param, char *buf) | |
7b8631b5 | 2076 | { |
7b7232f3 | 2077 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2078 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
fd7255f5 | 2079 | struct inet_sock *inet; |
5c75b7fc MC |
2080 | struct ipv6_pinfo *np; |
2081 | struct sock *sk; | |
2082 | int len; | |
7b8631b5 MC |
2083 | |
2084 | switch(param) { | |
fd7255f5 | 2085 | case ISCSI_PARAM_CONN_PORT: |
77a23c21 | 2086 | if (!tcp_conn->sock) |
fd7255f5 | 2087 | return -EINVAL; |
fd7255f5 | 2088 | |
5bb0b55a | 2089 | inet = inet_sk(tcp_conn->sock->sk); |
5c75b7fc | 2090 | len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport)); |
8d2860b3 | 2091 | break; |
fd7255f5 | 2092 | case ISCSI_PARAM_CONN_ADDRESS: |
77a23c21 | 2093 | if (!tcp_conn->sock) |
fd7255f5 | 2094 | return -EINVAL; |
fd7255f5 | 2095 | |
5bb0b55a | 2096 | sk = tcp_conn->sock->sk; |
fd7255f5 MC |
2097 | if (sk->sk_family == PF_INET) { |
2098 | inet = inet_sk(sk); | |
94cb3f82 | 2099 | len = sprintf(buf, NIPQUAD_FMT "\n", |
fd7255f5 MC |
2100 | NIPQUAD(inet->daddr)); |
2101 | } else { | |
2102 | np = inet6_sk(sk); | |
94cb3f82 | 2103 | len = sprintf(buf, NIP6_FMT "\n", NIP6(np->daddr)); |
fd7255f5 | 2104 | } |
fd7255f5 MC |
2105 | break; |
2106 | default: | |
5c75b7fc | 2107 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
2108 | } |
2109 | ||
2110 | return len; | |
2111 | } | |
2112 | ||
7ba24713 | 2113 | static void |
7b7232f3 | 2114 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 2115 | { |
7b7232f3 | 2116 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2117 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
2118 | |
2119 | stats->txdata_octets = conn->txdata_octets; | |
2120 | stats->rxdata_octets = conn->rxdata_octets; | |
2121 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
2122 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
2123 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
2124 | stats->datain_pdus = conn->datain_pdus_cnt; | |
2125 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
2126 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
2127 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
2128 | stats->custom_length = 3; | |
2129 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 2130 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 2131 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 2132 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
2133 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
2134 | stats->custom[2].value = conn->eh_abort_cnt; | |
2135 | } | |
2136 | ||
5bb0b55a MC |
2137 | static struct iscsi_cls_session * |
2138 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, | |
2139 | struct scsi_transport_template *scsit, | |
1548271e | 2140 | uint16_t cmds_max, uint16_t qdepth, |
5bb0b55a | 2141 | uint32_t initial_cmdsn, uint32_t *hostno) |
7ba24713 | 2142 | { |
5bb0b55a MC |
2143 | struct iscsi_cls_session *cls_session; |
2144 | struct iscsi_session *session; | |
2145 | uint32_t hn; | |
2146 | int cmd_i; | |
7ba24713 | 2147 | |
1548271e | 2148 | cls_session = iscsi_session_setup(iscsit, scsit, cmds_max, qdepth, |
5bb0b55a MC |
2149 | sizeof(struct iscsi_tcp_cmd_task), |
2150 | sizeof(struct iscsi_tcp_mgmt_task), | |
2151 | initial_cmdsn, &hn); | |
2152 | if (!cls_session) | |
2153 | return NULL; | |
2154 | *hostno = hn; | |
7ba24713 | 2155 | |
5bb0b55a MC |
2156 | session = class_to_transport_session(cls_session); |
2157 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2158 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
2159 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2160 | ||
2161 | ctask->hdr = &tcp_ctask->hdr; | |
2162 | } | |
2163 | ||
2164 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
2165 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
2166 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
2167 | ||
2168 | mtask->hdr = &tcp_mtask->hdr; | |
2169 | } | |
2170 | ||
2171 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) | |
2172 | goto r2tpool_alloc_fail; | |
2173 | ||
2174 | return cls_session; | |
2175 | ||
2176 | r2tpool_alloc_fail: | |
2177 | iscsi_session_teardown(cls_session); | |
2178 | return NULL; | |
2179 | } | |
2180 | ||
2181 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
2182 | { | |
5bb0b55a MC |
2183 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
2184 | iscsi_session_teardown(cls_session); | |
7ba24713 AA |
2185 | } |
2186 | ||
5bb0b55a | 2187 | static struct scsi_host_template iscsi_sht = { |
f4246b33 | 2188 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
2189 | .queuecommand = iscsi_queuecommand, |
2190 | .change_queue_depth = iscsi_change_queue_depth, | |
1548271e | 2191 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
5bb0b55a | 2192 | .sg_tablesize = ISCSI_SG_TABLESIZE, |
8231f0ed | 2193 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
2194 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
2195 | .eh_abort_handler = iscsi_eh_abort, | |
2196 | .eh_host_reset_handler = iscsi_eh_host_reset, | |
2197 | .use_clustering = DISABLE_CLUSTERING, | |
2198 | .proc_name = "iscsi_tcp", | |
2199 | .this_id = -1, | |
2200 | }; | |
2201 | ||
7ba24713 AA |
2202 | static struct iscsi_transport iscsi_tcp_transport = { |
2203 | .owner = THIS_MODULE, | |
2204 | .name = "tcp", | |
2205 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
2206 | | CAP_DATADGST, | |
fd7255f5 MC |
2207 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
2208 | ISCSI_MAX_XMIT_DLENGTH | | |
2209 | ISCSI_HDRDGST_EN | | |
2210 | ISCSI_DATADGST_EN | | |
2211 | ISCSI_INITIAL_R2T_EN | | |
2212 | ISCSI_MAX_R2T | | |
2213 | ISCSI_IMM_DATA_EN | | |
2214 | ISCSI_FIRST_BURST | | |
2215 | ISCSI_MAX_BURST | | |
2216 | ISCSI_PDU_INORDER_EN | | |
2217 | ISCSI_DATASEQ_INORDER_EN | | |
2218 | ISCSI_ERL | | |
2219 | ISCSI_CONN_PORT | | |
8d2860b3 | 2220 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
2221 | ISCSI_EXP_STATSN | |
2222 | ISCSI_PERSISTENT_PORT | | |
2223 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
2224 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
2225 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
2226 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN, | |
8ad5781a MC |
2227 | .host_param_mask = ISCSI_HOST_HWADDRESS | |
2228 | ISCSI_HOST_INITIATOR_NAME, | |
7ba24713 | 2229 | .host_template = &iscsi_sht, |
7b8631b5 | 2230 | .conndata_size = sizeof(struct iscsi_conn), |
7ba24713 AA |
2231 | .max_conn = 1, |
2232 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, | |
5bb0b55a MC |
2233 | /* session management */ |
2234 | .create_session = iscsi_tcp_session_create, | |
2235 | .destroy_session = iscsi_tcp_session_destroy, | |
2236 | /* connection management */ | |
2237 | .create_conn = iscsi_tcp_conn_create, | |
2238 | .bind_conn = iscsi_tcp_conn_bind, | |
2239 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 2240 | .set_param = iscsi_conn_set_param, |
5c75b7fc | 2241 | .get_conn_param = iscsi_tcp_conn_get_param, |
7b8631b5 | 2242 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 2243 | .start_conn = iscsi_conn_start, |
1c83469d | 2244 | .stop_conn = iscsi_tcp_conn_stop, |
0801c242 MC |
2245 | /* iscsi host params */ |
2246 | .get_host_param = iscsi_host_get_param, | |
2247 | .set_host_param = iscsi_host_set_param, | |
5bb0b55a | 2248 | /* IO */ |
7ba24713 AA |
2249 | .send_pdu = iscsi_conn_send_pdu, |
2250 | .get_stats = iscsi_conn_get_stats, | |
5bb0b55a MC |
2251 | .init_cmd_task = iscsi_tcp_cmd_init, |
2252 | .init_mgmt_task = iscsi_tcp_mgmt_init, | |
2253 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, | |
2254 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2255 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2256 | /* recovery */ | |
30a6c652 | 2257 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
2258 | }; |
2259 | ||
2260 | static int __init | |
2261 | iscsi_tcp_init(void) | |
2262 | { | |
7ba24713 | 2263 | if (iscsi_max_lun < 1) { |
be2df72e OG |
2264 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
2265 | iscsi_max_lun); | |
7ba24713 AA |
2266 | return -EINVAL; |
2267 | } | |
2268 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
2269 | ||
7b8631b5 | 2270 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
ffbfe925 | 2271 | return -ENODEV; |
7ba24713 | 2272 | |
7b8631b5 | 2273 | return 0; |
7ba24713 AA |
2274 | } |
2275 | ||
2276 | static void __exit | |
2277 | iscsi_tcp_exit(void) | |
2278 | { | |
2279 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
7ba24713 AA |
2280 | } |
2281 | ||
2282 | module_init(iscsi_tcp_init); | |
2283 | module_exit(iscsi_tcp_exit); |