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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> | |
4e7aba73 | 32 | #include <linux/file.h> |
7ba24713 AA |
33 | #include <linux/blkdev.h> |
34 | #include <linux/crypto.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/kfifo.h> | |
37 | #include <linux/scatterlist.h> | |
38 | #include <net/tcp.h> | |
39 | #include <scsi/scsi_cmnd.h> | |
d1d81c01 | 40 | #include <scsi/scsi_device.h> |
7ba24713 AA |
41 | #include <scsi/scsi_host.h> |
42 | #include <scsi/scsi.h> | |
43 | #include <scsi/scsi_transport_iscsi.h> | |
44 | ||
45 | #include "iscsi_tcp.h" | |
46 | ||
47 | MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
48 | "Alex Aizman <itn780@yahoo.com>"); | |
49 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
50 | MODULE_LICENSE("GPL"); | |
7ba24713 | 51 | /* #define DEBUG_TCP */ |
7ba24713 AA |
52 | #define DEBUG_ASSERT |
53 | ||
54 | #ifdef DEBUG_TCP | |
5bb0b55a | 55 | #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) |
7ba24713 AA |
56 | #else |
57 | #define debug_tcp(fmt...) | |
58 | #endif | |
59 | ||
7ba24713 AA |
60 | #ifndef DEBUG_ASSERT |
61 | #ifdef BUG_ON | |
62 | #undef BUG_ON | |
63 | #endif | |
64 | #define BUG_ON(expr) | |
65 | #endif | |
66 | ||
7ba24713 AA |
67 | static unsigned int iscsi_max_lun = 512; |
68 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
69 | ||
7ba24713 AA |
70 | static inline void |
71 | iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size) | |
72 | { | |
7cae5159 MC |
73 | ibuf->sg.page = virt_to_page(vbuf); |
74 | ibuf->sg.offset = offset_in_page(vbuf); | |
7ba24713 AA |
75 | ibuf->sg.length = size; |
76 | ibuf->sent = 0; | |
7cae5159 | 77 | ibuf->use_sendmsg = 1; |
7ba24713 AA |
78 | } |
79 | ||
80 | static inline void | |
81 | iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg) | |
82 | { | |
7cae5159 MC |
83 | ibuf->sg.page = sg->page; |
84 | ibuf->sg.offset = sg->offset; | |
85 | ibuf->sg.length = sg->length; | |
7ba24713 AA |
86 | /* |
87 | * Fastpath: sg element fits into single page | |
88 | */ | |
a1e80c20 | 89 | if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page)) |
7cae5159 MC |
90 | ibuf->use_sendmsg = 0; |
91 | else | |
92 | ibuf->use_sendmsg = 1; | |
7ba24713 AA |
93 | ibuf->sent = 0; |
94 | } | |
95 | ||
96 | static inline int | |
97 | iscsi_buf_left(struct iscsi_buf *ibuf) | |
98 | { | |
99 | int rc; | |
100 | ||
101 | rc = ibuf->sg.length - ibuf->sent; | |
102 | BUG_ON(rc < 0); | |
103 | return rc; | |
104 | } | |
105 | ||
106 | static inline void | |
af973481 MC |
107 | iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, |
108 | u8* crc) | |
7ba24713 | 109 | { |
5bb0b55a | 110 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 111 | |
c9802cd9 | 112 | crypto_hash_digest(&tcp_conn->tx_hash, &buf->sg, buf->sg.length, crc); |
218432c6 | 113 | buf->sg.length += sizeof(u32); |
7ba24713 AA |
114 | } |
115 | ||
116 | static inline int | |
5bb0b55a | 117 | iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 118 | { |
5bb0b55a | 119 | struct sk_buff *skb = tcp_conn->in.skb; |
7ba24713 | 120 | |
5bb0b55a | 121 | tcp_conn->in.zero_copy_hdr = 0; |
7ba24713 | 122 | |
5bb0b55a MC |
123 | if (tcp_conn->in.copy >= tcp_conn->hdr_size && |
124 | tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) { | |
7ba24713 AA |
125 | /* |
126 | * Zero-copy PDU Header: using connection context | |
127 | * to store header pointer. | |
128 | */ | |
129 | if (skb_shinfo(skb)->frag_list == NULL && | |
5bb0b55a MC |
130 | !skb_shinfo(skb)->nr_frags) { |
131 | tcp_conn->in.hdr = (struct iscsi_hdr *) | |
132 | ((char*)skb->data + tcp_conn->in.offset); | |
133 | tcp_conn->in.zero_copy_hdr = 1; | |
134 | } else { | |
7ba24713 AA |
135 | /* ignoring return code since we checked |
136 | * in.copy before */ | |
5bb0b55a MC |
137 | skb_copy_bits(skb, tcp_conn->in.offset, |
138 | &tcp_conn->hdr, tcp_conn->hdr_size); | |
139 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
7ba24713 | 140 | } |
5bb0b55a MC |
141 | tcp_conn->in.offset += tcp_conn->hdr_size; |
142 | tcp_conn->in.copy -= tcp_conn->hdr_size; | |
7ba24713 AA |
143 | } else { |
144 | int hdr_remains; | |
145 | int copylen; | |
146 | ||
147 | /* | |
148 | * PDU header scattered across SKB's, | |
149 | * copying it... This'll happen quite rarely. | |
150 | */ | |
151 | ||
5bb0b55a MC |
152 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) |
153 | tcp_conn->in.hdr_offset = 0; | |
7ba24713 | 154 | |
5bb0b55a | 155 | hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset; |
7ba24713 AA |
156 | BUG_ON(hdr_remains <= 0); |
157 | ||
5bb0b55a MC |
158 | copylen = min(tcp_conn->in.copy, hdr_remains); |
159 | skb_copy_bits(skb, tcp_conn->in.offset, | |
160 | (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset, | |
161 | copylen); | |
7ba24713 AA |
162 | |
163 | debug_tcp("PDU gather offset %d bytes %d in.offset %d " | |
5bb0b55a MC |
164 | "in.copy %d\n", tcp_conn->in.hdr_offset, copylen, |
165 | tcp_conn->in.offset, tcp_conn->in.copy); | |
7ba24713 | 166 | |
5bb0b55a MC |
167 | tcp_conn->in.offset += copylen; |
168 | tcp_conn->in.copy -= copylen; | |
7ba24713 | 169 | if (copylen < hdr_remains) { |
5bb0b55a MC |
170 | tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER; |
171 | tcp_conn->in.hdr_offset += copylen; | |
7ba24713 AA |
172 | return -EAGAIN; |
173 | } | |
5bb0b55a MC |
174 | tcp_conn->in.hdr = &tcp_conn->hdr; |
175 | tcp_conn->discontiguous_hdr_cnt++; | |
176 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
177 | } |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
30a6c652 MC |
182 | /* |
183 | * must be called with session lock | |
184 | */ | |
185 | static void | |
b6c395ed | 186 | iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 187 | { |
5bb0b55a | 188 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
b6c395ed | 189 | struct iscsi_r2t_info *r2t; |
30a6c652 | 190 | struct scsi_cmnd *sc; |
7ba24713 | 191 | |
b6c395ed MC |
192 | /* flush ctask's r2t queues */ |
193 | while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { | |
194 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
195 | sizeof(void*)); | |
196 | debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n"); | |
197 | } | |
198 | ||
30a6c652 MC |
199 | sc = ctask->sc; |
200 | if (unlikely(!sc)) | |
7ba24713 | 201 | return; |
30a6c652 | 202 | |
5bb0b55a MC |
203 | tcp_ctask->xmstate = XMSTATE_IDLE; |
204 | tcp_ctask->r2t = NULL; | |
7ba24713 AA |
205 | } |
206 | ||
207 | /** | |
208 | * iscsi_data_rsp - SCSI Data-In Response processing | |
209 | * @conn: iscsi connection | |
210 | * @ctask: scsi command task | |
211 | **/ | |
212 | static int | |
213 | iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
214 | { | |
5bb0b55a MC |
215 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
216 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
217 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
7ba24713 | 218 | struct iscsi_session *session = conn->session; |
857ae0bd | 219 | struct scsi_cmnd *sc = ctask->sc; |
7ba24713 AA |
220 | int datasn = be32_to_cpu(rhdr->datasn); |
221 | ||
77a23c21 | 222 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7ba24713 AA |
223 | /* |
224 | * setup Data-In byte counter (gets decremented..) | |
225 | */ | |
5bb0b55a | 226 | ctask->data_count = tcp_conn->in.datalen; |
7ba24713 | 227 | |
5bb0b55a | 228 | if (tcp_conn->in.datalen == 0) |
7ba24713 AA |
229 | return 0; |
230 | ||
d473cc7f MC |
231 | if (tcp_ctask->exp_datasn != datasn) { |
232 | debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->datasn(%d)\n", | |
233 | __FUNCTION__, tcp_ctask->exp_datasn, datasn); | |
7ba24713 | 234 | return ISCSI_ERR_DATASN; |
d473cc7f | 235 | } |
7ba24713 | 236 | |
d473cc7f | 237 | tcp_ctask->exp_datasn++; |
7ba24713 | 238 | |
5bb0b55a | 239 | tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); |
857ae0bd MC |
240 | if (tcp_ctask->data_offset + tcp_conn->in.datalen > sc->request_bufflen) { |
241 | debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n", | |
242 | __FUNCTION__, tcp_ctask->data_offset, | |
243 | tcp_conn->in.datalen, sc->request_bufflen); | |
7ba24713 | 244 | return ISCSI_ERR_DATA_OFFSET; |
857ae0bd | 245 | } |
7ba24713 AA |
246 | |
247 | if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
7ba24713 | 248 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
bf310b8f | 249 | if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) { |
7ba24713 AA |
250 | int res_count = be32_to_cpu(rhdr->residual_count); |
251 | ||
252 | if (res_count > 0 && | |
253 | res_count <= sc->request_bufflen) { | |
254 | sc->resid = res_count; | |
255 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
256 | } else | |
257 | sc->result = (DID_BAD_TARGET << 16) | | |
258 | rhdr->cmd_status; | |
bf310b8f | 259 | } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) { |
7ba24713 AA |
260 | sc->resid = be32_to_cpu(rhdr->residual_count); |
261 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
262 | } else | |
263 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
264 | } | |
265 | ||
266 | conn->datain_pdus_cnt++; | |
267 | return 0; | |
268 | } | |
269 | ||
270 | /** | |
271 | * iscsi_solicit_data_init - initialize first Data-Out | |
272 | * @conn: iscsi connection | |
273 | * @ctask: scsi command task | |
274 | * @r2t: R2T info | |
275 | * | |
276 | * Notes: | |
277 | * Initialize first Data-Out within this R2T sequence and finds | |
278 | * proper data_offset within this SCSI command. | |
279 | * | |
280 | * This function is called with connection lock taken. | |
281 | **/ | |
282 | static void | |
283 | iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
284 | struct iscsi_r2t_info *r2t) | |
285 | { | |
286 | struct iscsi_data *hdr; | |
7ba24713 AA |
287 | struct scsi_cmnd *sc = ctask->sc; |
288 | ||
ffbfe925 | 289 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
290 | memset(hdr, 0, sizeof(struct iscsi_data)); |
291 | hdr->ttt = r2t->ttt; | |
292 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
293 | r2t->solicit_datasn++; | |
294 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
295 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
296 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
297 | hdr->exp_statsn = r2t->exp_statsn; |
298 | hdr->offset = cpu_to_be32(r2t->data_offset); | |
299 | if (r2t->data_length > conn->max_xmit_dlength) { | |
300 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
301 | r2t->data_count = conn->max_xmit_dlength; | |
302 | hdr->flags = 0; | |
303 | } else { | |
304 | hton24(hdr->dlength, r2t->data_length); | |
305 | r2t->data_count = r2t->data_length; | |
306 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
307 | } | |
308 | conn->dataout_pdus_cnt++; | |
309 | ||
310 | r2t->sent = 0; | |
311 | ||
6e458cc9 | 312 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 313 | sizeof(struct iscsi_hdr)); |
7ba24713 | 314 | |
7ba24713 AA |
315 | if (sc->use_sg) { |
316 | int i, sg_count = 0; | |
317 | struct scatterlist *sg = sc->request_buffer; | |
318 | ||
319 | r2t->sg = NULL; | |
320 | for (i = 0; i < sc->use_sg; i++, sg += 1) { | |
321 | /* FIXME: prefetch ? */ | |
322 | if (sg_count + sg->length > r2t->data_offset) { | |
323 | int page_offset; | |
324 | ||
325 | /* sg page found! */ | |
326 | ||
327 | /* offset within this page */ | |
328 | page_offset = r2t->data_offset - sg_count; | |
329 | ||
330 | /* fill in this buffer */ | |
331 | iscsi_buf_init_sg(&r2t->sendbuf, sg); | |
332 | r2t->sendbuf.sg.offset += page_offset; | |
333 | r2t->sendbuf.sg.length -= page_offset; | |
334 | ||
335 | /* xmit logic will continue with next one */ | |
336 | r2t->sg = sg + 1; | |
337 | break; | |
338 | } | |
339 | sg_count += sg->length; | |
340 | } | |
341 | BUG_ON(r2t->sg == NULL); | |
62f38300 MC |
342 | } else { |
343 | iscsi_buf_init_iov(&r2t->sendbuf, | |
7ba24713 AA |
344 | (char*)sc->request_buffer + r2t->data_offset, |
345 | r2t->data_count); | |
62f38300 MC |
346 | r2t->sg = NULL; |
347 | } | |
7ba24713 AA |
348 | } |
349 | ||
350 | /** | |
351 | * iscsi_r2t_rsp - iSCSI R2T Response processing | |
352 | * @conn: iscsi connection | |
353 | * @ctask: scsi command task | |
354 | **/ | |
355 | static int | |
356 | iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
357 | { | |
358 | struct iscsi_r2t_info *r2t; | |
359 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
360 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
361 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
362 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
7ba24713 AA |
363 | int r2tsn = be32_to_cpu(rhdr->r2tsn); |
364 | int rc; | |
365 | ||
98a9416a MC |
366 | if (tcp_conn->in.datalen) { |
367 | printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n", | |
368 | tcp_conn->in.datalen); | |
7ba24713 | 369 | return ISCSI_ERR_DATALEN; |
98a9416a | 370 | } |
7ba24713 | 371 | |
d473cc7f MC |
372 | if (tcp_ctask->exp_datasn != r2tsn){ |
373 | debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n", | |
374 | __FUNCTION__, tcp_ctask->exp_datasn, r2tsn); | |
7ba24713 | 375 | return ISCSI_ERR_R2TSN; |
d473cc7f | 376 | } |
7ba24713 | 377 | |
7ba24713 AA |
378 | /* fill-in new R2T associated with the task */ |
379 | spin_lock(&session->lock); | |
77a23c21 MC |
380 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
381 | ||
7ba24713 AA |
382 | if (!ctask->sc || ctask->mtask || |
383 | session->state != ISCSI_STATE_LOGGED_IN) { | |
384 | printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " | |
385 | "recovery...\n", ctask->itt); | |
386 | spin_unlock(&session->lock); | |
387 | return 0; | |
388 | } | |
b6c395ed | 389 | |
5bb0b55a | 390 | rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 AA |
391 | BUG_ON(!rc); |
392 | ||
393 | r2t->exp_statsn = rhdr->statsn; | |
394 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
98a9416a MC |
395 | if (r2t->data_length == 0) { |
396 | printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n"); | |
7ba24713 AA |
397 | spin_unlock(&session->lock); |
398 | return ISCSI_ERR_DATALEN; | |
399 | } | |
400 | ||
98a9416a MC |
401 | if (r2t->data_length > session->max_burst) |
402 | debug_scsi("invalid R2T with data len %u and max burst %u." | |
403 | "Attempting to execute request.\n", | |
404 | r2t->data_length, session->max_burst); | |
405 | ||
7ba24713 | 406 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); |
857ae0bd | 407 | if (r2t->data_offset + r2t->data_length > ctask->sc->request_bufflen) { |
7ba24713 | 408 | spin_unlock(&session->lock); |
98a9416a MC |
409 | printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at " |
410 | "offset %u and total length %d\n", r2t->data_length, | |
857ae0bd | 411 | r2t->data_offset, ctask->sc->request_bufflen); |
7ba24713 AA |
412 | return ISCSI_ERR_DATALEN; |
413 | } | |
414 | ||
415 | r2t->ttt = rhdr->ttt; /* no flip */ | |
416 | r2t->solicit_datasn = 0; | |
417 | ||
418 | iscsi_solicit_data_init(conn, ctask, r2t); | |
419 | ||
d473cc7f | 420 | tcp_ctask->exp_datasn = r2tsn + 1; |
5bb0b55a | 421 | __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); |
218432c6 | 422 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR_INIT; |
b6c395ed | 423 | list_move_tail(&ctask->running, &conn->xmitqueue); |
7ba24713 | 424 | |
55e3299d | 425 | scsi_queue_work(session->host, &conn->xmitwork); |
7ba24713 AA |
426 | conn->r2t_pdus_cnt++; |
427 | spin_unlock(&session->lock); | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
432 | static int | |
5bb0b55a | 433 | iscsi_tcp_hdr_recv(struct iscsi_conn *conn) |
7ba24713 | 434 | { |
5bb0b55a | 435 | int rc = 0, opcode, ahslen; |
7ba24713 | 436 | struct iscsi_hdr *hdr; |
7ba24713 | 437 | struct iscsi_session *session = conn->session; |
5bb0b55a MC |
438 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
439 | uint32_t cdgst, rdgst = 0, itt; | |
7ba24713 | 440 | |
5bb0b55a | 441 | hdr = tcp_conn->in.hdr; |
7ba24713 AA |
442 | |
443 | /* verify PDU length */ | |
5bb0b55a MC |
444 | tcp_conn->in.datalen = ntoh24(hdr->dlength); |
445 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
7ba24713 | 446 | printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", |
5bb0b55a | 447 | tcp_conn->in.datalen, conn->max_recv_dlength); |
7ba24713 AA |
448 | return ISCSI_ERR_DATALEN; |
449 | } | |
5bb0b55a | 450 | tcp_conn->data_copied = 0; |
7ba24713 AA |
451 | |
452 | /* read AHS */ | |
5bb0b55a MC |
453 | ahslen = hdr->hlength << 2; |
454 | tcp_conn->in.offset += ahslen; | |
455 | tcp_conn->in.copy -= ahslen; | |
456 | if (tcp_conn->in.copy < 0) { | |
7ba24713 | 457 | printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " |
5bb0b55a | 458 | "%d bytes\n", ahslen); |
7ba24713 AA |
459 | return ISCSI_ERR_AHSLEN; |
460 | } | |
461 | ||
462 | /* calculate read padding */ | |
5bb0b55a MC |
463 | tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1); |
464 | if (tcp_conn->in.padding) { | |
465 | tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding; | |
466 | debug_scsi("read padding %d bytes\n", tcp_conn->in.padding); | |
7ba24713 AA |
467 | } |
468 | ||
469 | if (conn->hdrdgst_en) { | |
470 | struct scatterlist sg; | |
471 | ||
472 | sg_init_one(&sg, (u8 *)hdr, | |
5bb0b55a | 473 | sizeof(struct iscsi_hdr) + ahslen); |
c9802cd9 JB |
474 | crypto_hash_digest(&tcp_conn->rx_hash, &sg, sg.length, |
475 | (u8 *)&cdgst); | |
7ba24713 | 476 | rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + |
5bb0b55a | 477 | ahslen); |
8a47cd34 | 478 | if (cdgst != rdgst) { |
5bb0b55a MC |
479 | printk(KERN_ERR "iscsi_tcp: hdrdgst error " |
480 | "recv 0x%x calc 0x%x\n", rdgst, cdgst); | |
8a47cd34 MC |
481 | return ISCSI_ERR_HDR_DGST; |
482 | } | |
7ba24713 AA |
483 | } |
484 | ||
5bb0b55a | 485 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
7ba24713 | 486 | /* verify itt (itt encoding: age+cid+itt) */ |
5bb0b55a MC |
487 | rc = iscsi_verify_itt(conn, hdr, &itt); |
488 | if (rc == ISCSI_ERR_NO_SCSI_CMD) { | |
489 | tcp_conn->in.datalen = 0; /* force drop */ | |
490 | return 0; | |
491 | } else if (rc) | |
492 | return rc; | |
7ba24713 AA |
493 | |
494 | debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", | |
5bb0b55a MC |
495 | opcode, tcp_conn->in.offset, tcp_conn->in.copy, |
496 | ahslen, tcp_conn->in.datalen); | |
7ba24713 | 497 | |
5bb0b55a MC |
498 | switch(opcode) { |
499 | case ISCSI_OP_SCSI_DATA_IN: | |
500 | tcp_conn->in.ctask = session->cmds[itt]; | |
501 | rc = iscsi_data_rsp(conn, tcp_conn->in.ctask); | |
275fd7d1 MC |
502 | if (rc) |
503 | return rc; | |
5bb0b55a MC |
504 | /* fall through */ |
505 | case ISCSI_OP_SCSI_CMD_RSP: | |
506 | tcp_conn->in.ctask = session->cmds[itt]; | |
507 | if (tcp_conn->in.datalen) | |
508 | goto copy_hdr; | |
7ba24713 | 509 | |
5bb0b55a | 510 | spin_lock(&session->lock); |
5bb0b55a MC |
511 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); |
512 | spin_unlock(&session->lock); | |
513 | break; | |
514 | case ISCSI_OP_R2T: | |
515 | tcp_conn->in.ctask = session->cmds[itt]; | |
516 | if (ahslen) | |
517 | rc = ISCSI_ERR_AHSLEN; | |
518 | else if (tcp_conn->in.ctask->sc->sc_data_direction == | |
519 | DMA_TO_DEVICE) | |
520 | rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); | |
521 | else | |
522 | rc = ISCSI_ERR_PROTO; | |
523 | break; | |
524 | case ISCSI_OP_LOGIN_RSP: | |
525 | case ISCSI_OP_TEXT_RSP: | |
5bb0b55a MC |
526 | case ISCSI_OP_REJECT: |
527 | case ISCSI_OP_ASYNC_EVENT: | |
c8dc1e52 MC |
528 | /* |
529 | * It is possible that we could get a PDU with a buffer larger | |
530 | * than 8K, but there are no targets that currently do this. | |
531 | * For now we fail until we find a vendor that needs it | |
532 | */ | |
bf32ed33 | 533 | if (ISCSI_DEF_MAX_RECV_SEG_LEN < |
c8dc1e52 MC |
534 | tcp_conn->in.datalen) { |
535 | printk(KERN_ERR "iscsi_tcp: received buffer of len %u " | |
536 | "but conn buffer is only %u (opcode %0x)\n", | |
537 | tcp_conn->in.datalen, | |
bf32ed33 | 538 | ISCSI_DEF_MAX_RECV_SEG_LEN, opcode); |
c8dc1e52 MC |
539 | rc = ISCSI_ERR_PROTO; |
540 | break; | |
541 | } | |
542 | ||
5bb0b55a MC |
543 | if (tcp_conn->in.datalen) |
544 | goto copy_hdr; | |
545 | /* fall through */ | |
c8dc1e52 MC |
546 | case ISCSI_OP_LOGOUT_RSP: |
547 | case ISCSI_OP_NOOP_IN: | |
5bb0b55a MC |
548 | case ISCSI_OP_SCSI_TMFUNC_RSP: |
549 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
550 | break; | |
551 | default: | |
552 | rc = ISCSI_ERR_BAD_OPCODE; | |
553 | break; | |
554 | } | |
7ba24713 AA |
555 | |
556 | return rc; | |
5bb0b55a MC |
557 | |
558 | copy_hdr: | |
559 | /* | |
560 | * if we did zero copy for the header but we will need multiple | |
561 | * skbs to complete the command then we have to copy the header | |
562 | * for later use | |
563 | */ | |
275fd7d1 | 564 | if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <= |
5bb0b55a MC |
565 | (tcp_conn->in.datalen + tcp_conn->in.padding + |
566 | (conn->datadgst_en ? 4 : 0))) { | |
567 | debug_tcp("Copying header for later use. in.copy %d in.datalen" | |
568 | " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); | |
569 | memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, | |
570 | sizeof(struct iscsi_hdr)); | |
571 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
572 | tcp_conn->in.zero_copy_hdr = 0; | |
573 | } | |
574 | return 0; | |
7ba24713 AA |
575 | } |
576 | ||
577 | /** | |
578 | * iscsi_ctask_copy - copy skb bits to the destanation cmd task | |
5bb0b55a | 579 | * @conn: iscsi tcp connection |
7ba24713 AA |
580 | * @ctask: scsi command task |
581 | * @buf: buffer to copy to | |
582 | * @buf_size: size of buffer | |
583 | * @offset: offset within the buffer | |
584 | * | |
585 | * Notes: | |
586 | * The function calls skb_copy_bits() and updates per-connection and | |
587 | * per-cmd byte counters. | |
588 | * | |
589 | * Read counters (in bytes): | |
590 | * | |
591 | * conn->in.offset offset within in progress SKB | |
592 | * conn->in.copy left to copy from in progress SKB | |
593 | * including padding | |
594 | * conn->in.copied copied already from in progress SKB | |
595 | * conn->data_copied copied already from in progress buffer | |
596 | * ctask->sent total bytes sent up to the MidLayer | |
597 | * ctask->data_count left to copy from in progress Data-In | |
598 | * buf_left left to copy from in progress buffer | |
599 | **/ | |
600 | static inline int | |
5bb0b55a | 601 | iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, |
7ba24713 AA |
602 | void *buf, int buf_size, int offset) |
603 | { | |
5bb0b55a MC |
604 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
605 | int buf_left = buf_size - (tcp_conn->data_copied + offset); | |
857ae0bd | 606 | unsigned size = min(tcp_conn->in.copy, buf_left); |
7ba24713 AA |
607 | int rc; |
608 | ||
609 | size = min(size, ctask->data_count); | |
610 | ||
611 | debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 612 | size, tcp_conn->in.offset, tcp_conn->in.copied); |
7ba24713 AA |
613 | |
614 | BUG_ON(size <= 0); | |
857ae0bd | 615 | BUG_ON(tcp_ctask->sent + size > ctask->sc->request_bufflen); |
7ba24713 | 616 | |
5bb0b55a MC |
617 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
618 | (char*)buf + (offset + tcp_conn->data_copied), size); | |
7ba24713 AA |
619 | /* must fit into skb->len */ |
620 | BUG_ON(rc); | |
621 | ||
5bb0b55a MC |
622 | tcp_conn->in.offset += size; |
623 | tcp_conn->in.copy -= size; | |
624 | tcp_conn->in.copied += size; | |
625 | tcp_conn->data_copied += size; | |
626 | tcp_ctask->sent += size; | |
7ba24713 AA |
627 | ctask->data_count -= size; |
628 | ||
5bb0b55a | 629 | BUG_ON(tcp_conn->in.copy < 0); |
7ba24713 AA |
630 | BUG_ON(ctask->data_count < 0); |
631 | ||
5bb0b55a | 632 | if (buf_size != (tcp_conn->data_copied + offset)) { |
7ba24713 | 633 | if (!ctask->data_count) { |
5bb0b55a | 634 | BUG_ON(buf_size - tcp_conn->data_copied < 0); |
7ba24713 | 635 | /* done with this PDU */ |
5bb0b55a | 636 | return buf_size - tcp_conn->data_copied; |
7ba24713 AA |
637 | } |
638 | return -EAGAIN; | |
639 | } | |
640 | ||
641 | /* done with this buffer or with both - PDU and buffer */ | |
5bb0b55a | 642 | tcp_conn->data_copied = 0; |
7ba24713 AA |
643 | return 0; |
644 | } | |
645 | ||
646 | /** | |
647 | * iscsi_tcp_copy - copy skb bits to the destanation buffer | |
5bb0b55a | 648 | * @conn: iscsi tcp connection |
7ba24713 AA |
649 | * |
650 | * Notes: | |
651 | * The function calls skb_copy_bits() and updates per-connection | |
652 | * byte counters. | |
653 | **/ | |
654 | static inline int | |
ca518684 | 655 | iscsi_tcp_copy(struct iscsi_conn *conn, int buf_size) |
7ba24713 | 656 | { |
c8dc1e52 | 657 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5bb0b55a MC |
658 | int buf_left = buf_size - tcp_conn->data_copied; |
659 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
660 | int rc; |
661 | ||
662 | debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 663 | size, tcp_conn->in.offset, tcp_conn->data_copied); |
7ba24713 AA |
664 | BUG_ON(size <= 0); |
665 | ||
5bb0b55a | 666 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
c8dc1e52 | 667 | (char*)conn->data + tcp_conn->data_copied, size); |
7ba24713 AA |
668 | BUG_ON(rc); |
669 | ||
5bb0b55a MC |
670 | tcp_conn->in.offset += size; |
671 | tcp_conn->in.copy -= size; | |
672 | tcp_conn->in.copied += size; | |
673 | tcp_conn->data_copied += size; | |
7ba24713 | 674 | |
5bb0b55a | 675 | if (buf_size != tcp_conn->data_copied) |
7ba24713 AA |
676 | return -EAGAIN; |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
681 | static inline void | |
c9802cd9 | 682 | partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg, |
62f38300 | 683 | int offset, int length) |
7ba24713 AA |
684 | { |
685 | struct scatterlist temp; | |
686 | ||
687 | memcpy(&temp, sg, sizeof(struct scatterlist)); | |
688 | temp.offset = offset; | |
689 | temp.length = length; | |
c9802cd9 | 690 | crypto_hash_update(desc, &temp, length); |
7ba24713 AA |
691 | } |
692 | ||
f6cfba1d | 693 | static void |
5bb0b55a | 694 | iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) |
f6cfba1d MC |
695 | { |
696 | struct scatterlist tmp; | |
697 | ||
698 | sg_init_one(&tmp, buf, len); | |
c9802cd9 | 699 | crypto_hash_update(&tcp_conn->rx_hash, &tmp, len); |
f6cfba1d MC |
700 | } |
701 | ||
7ba24713 AA |
702 | static int iscsi_scsi_data_in(struct iscsi_conn *conn) |
703 | { | |
5bb0b55a MC |
704 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
705 | struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; | |
706 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 707 | struct scsi_cmnd *sc = ctask->sc; |
f6cfba1d | 708 | struct scatterlist *sg; |
7ba24713 AA |
709 | int i, offset, rc = 0; |
710 | ||
711 | BUG_ON((void*)ctask != sc->SCp.ptr); | |
712 | ||
713 | /* | |
714 | * copying Data-In into the Scsi_Cmnd | |
715 | */ | |
716 | if (!sc->use_sg) { | |
717 | i = ctask->data_count; | |
5bb0b55a MC |
718 | rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, |
719 | sc->request_bufflen, | |
720 | tcp_ctask->data_offset); | |
7ba24713 AA |
721 | if (rc == -EAGAIN) |
722 | return rc; | |
42f72aa9 | 723 | if (conn->datadgst_en) |
5bb0b55a MC |
724 | iscsi_recv_digest_update(tcp_conn, sc->request_buffer, |
725 | i); | |
7ba24713 AA |
726 | rc = 0; |
727 | goto done; | |
728 | } | |
729 | ||
5bb0b55a | 730 | offset = tcp_ctask->data_offset; |
7ba24713 AA |
731 | sg = sc->request_buffer; |
732 | ||
5bb0b55a MC |
733 | if (tcp_ctask->data_offset) |
734 | for (i = 0; i < tcp_ctask->sg_count; i++) | |
7ba24713 AA |
735 | offset -= sg[i].length; |
736 | /* we've passed through partial sg*/ | |
737 | if (offset < 0) | |
738 | offset = 0; | |
739 | ||
5bb0b55a | 740 | for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { |
7ba24713 AA |
741 | char *dest; |
742 | ||
743 | dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); | |
5bb0b55a | 744 | rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, |
7ba24713 AA |
745 | sg[i].length, offset); |
746 | kunmap_atomic(dest, KM_SOFTIRQ0); | |
747 | if (rc == -EAGAIN) | |
748 | /* continue with the next SKB/PDU */ | |
749 | return rc; | |
750 | if (!rc) { | |
751 | if (conn->datadgst_en) { | |
752 | if (!offset) | |
dc64ddf4 | 753 | crypto_hash_update( |
c9802cd9 | 754 | &tcp_conn->rx_hash, |
c959e1c2 | 755 | &sg[i], sg[i].length); |
7ba24713 | 756 | else |
62f38300 | 757 | partial_sg_digest_update( |
c9802cd9 | 758 | &tcp_conn->rx_hash, |
5bb0b55a | 759 | &sg[i], |
7ba24713 AA |
760 | sg[i].offset + offset, |
761 | sg[i].length - offset); | |
762 | } | |
763 | offset = 0; | |
5bb0b55a | 764 | tcp_ctask->sg_count++; |
7ba24713 AA |
765 | } |
766 | ||
767 | if (!ctask->data_count) { | |
768 | if (rc && conn->datadgst_en) | |
769 | /* | |
770 | * data-in is complete, but buffer not... | |
771 | */ | |
c9802cd9 JB |
772 | partial_sg_digest_update(&tcp_conn->rx_hash, |
773 | &sg[i], | |
774 | sg[i].offset, | |
775 | sg[i].length-rc); | |
7ba24713 AA |
776 | rc = 0; |
777 | break; | |
778 | } | |
779 | ||
5bb0b55a | 780 | if (!tcp_conn->in.copy) |
7ba24713 AA |
781 | return -EAGAIN; |
782 | } | |
783 | BUG_ON(ctask->data_count); | |
784 | ||
785 | done: | |
786 | /* check for non-exceptional status */ | |
5bb0b55a | 787 | if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { |
b6c395ed MC |
788 | debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n", |
789 | (long)sc, sc->result, ctask->itt, | |
790 | tcp_conn->in.hdr->flags); | |
5bb0b55a | 791 | spin_lock(&conn->session->lock); |
5bb0b55a MC |
792 | __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); |
793 | spin_unlock(&conn->session->lock); | |
7ba24713 AA |
794 | } |
795 | ||
796 | return rc; | |
797 | } | |
798 | ||
799 | static int | |
800 | iscsi_data_recv(struct iscsi_conn *conn) | |
801 | { | |
5bb0b55a MC |
802 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
803 | int rc = 0, opcode; | |
7ba24713 | 804 | |
5bb0b55a MC |
805 | opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
806 | switch (opcode) { | |
7ba24713 AA |
807 | case ISCSI_OP_SCSI_DATA_IN: |
808 | rc = iscsi_scsi_data_in(conn); | |
809 | break; | |
5bb0b55a | 810 | case ISCSI_OP_SCSI_CMD_RSP: |
7ba24713 AA |
811 | case ISCSI_OP_TEXT_RSP: |
812 | case ISCSI_OP_LOGIN_RSP: | |
5bb0b55a MC |
813 | case ISCSI_OP_ASYNC_EVENT: |
814 | case ISCSI_OP_REJECT: | |
7ba24713 AA |
815 | /* |
816 | * Collect data segment to the connection's data | |
817 | * placeholder | |
818 | */ | |
ca518684 | 819 | if (iscsi_tcp_copy(conn, tcp_conn->in.datalen)) { |
7ba24713 AA |
820 | rc = -EAGAIN; |
821 | goto exit; | |
822 | } | |
823 | ||
c8dc1e52 | 824 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data, |
5bb0b55a MC |
825 | tcp_conn->in.datalen); |
826 | if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) | |
c8dc1e52 | 827 | iscsi_recv_digest_update(tcp_conn, conn->data, |
5bb0b55a MC |
828 | tcp_conn->in.datalen); |
829 | break; | |
7ba24713 AA |
830 | default: |
831 | BUG_ON(1); | |
832 | } | |
833 | exit: | |
834 | return rc; | |
835 | } | |
836 | ||
837 | /** | |
838 | * iscsi_tcp_data_recv - TCP receive in sendfile fashion | |
839 | * @rd_desc: read descriptor | |
840 | * @skb: socket buffer | |
841 | * @offset: offset in skb | |
842 | * @len: skb->len - offset | |
843 | **/ | |
844 | static int | |
845 | iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
846 | unsigned int offset, size_t len) | |
847 | { | |
848 | int rc; | |
849 | struct iscsi_conn *conn = rd_desc->arg.data; | |
5bb0b55a | 850 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
851 | int processed; |
852 | char pad[ISCSI_PAD_LEN]; | |
853 | struct scatterlist sg; | |
854 | ||
855 | /* | |
856 | * Save current SKB and its offset in the corresponding | |
857 | * connection context. | |
858 | */ | |
5bb0b55a MC |
859 | tcp_conn->in.copy = skb->len - offset; |
860 | tcp_conn->in.offset = offset; | |
861 | tcp_conn->in.skb = skb; | |
862 | tcp_conn->in.len = tcp_conn->in.copy; | |
863 | BUG_ON(tcp_conn->in.copy <= 0); | |
864 | debug_tcp("in %d bytes\n", tcp_conn->in.copy); | |
7ba24713 AA |
865 | |
866 | more: | |
5bb0b55a | 867 | tcp_conn->in.copied = 0; |
7ba24713 AA |
868 | rc = 0; |
869 | ||
870 | if (unlikely(conn->suspend_rx)) { | |
871 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
872 | return 0; | |
873 | } | |
874 | ||
5bb0b55a MC |
875 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || |
876 | tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { | |
877 | rc = iscsi_hdr_extract(tcp_conn); | |
7ba24713 AA |
878 | if (rc) { |
879 | if (rc == -EAGAIN) | |
880 | goto nomore; | |
881 | else { | |
d82967c7 | 882 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
883 | return 0; |
884 | } | |
885 | } | |
886 | ||
887 | /* | |
888 | * Verify and process incoming PDU header. | |
889 | */ | |
5bb0b55a MC |
890 | rc = iscsi_tcp_hdr_recv(conn); |
891 | if (!rc && tcp_conn->in.datalen) { | |
dd8c0d95 | 892 | if (conn->datadgst_en) |
c9802cd9 | 893 | crypto_hash_init(&tcp_conn->rx_hash); |
5bb0b55a | 894 | tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; |
7ba24713 | 895 | } else if (rc) { |
40527afe | 896 | iscsi_conn_failure(conn, rc); |
7ba24713 AA |
897 | return 0; |
898 | } | |
899 | } | |
900 | ||
dbdb016d MC |
901 | if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV && |
902 | tcp_conn->in.copy) { | |
f6cfba1d | 903 | uint32_t recv_digest; |
5bb0b55a | 904 | |
7ba24713 | 905 | debug_tcp("extra data_recv offset %d copy %d\n", |
5bb0b55a | 906 | tcp_conn->in.offset, tcp_conn->in.copy); |
dbdb016d MC |
907 | |
908 | if (!tcp_conn->data_copied) { | |
909 | if (tcp_conn->in.padding) { | |
910 | debug_tcp("padding -> %d\n", | |
911 | tcp_conn->in.padding); | |
912 | memset(pad, 0, tcp_conn->in.padding); | |
913 | sg_init_one(&sg, pad, tcp_conn->in.padding); | |
914 | crypto_hash_update(&tcp_conn->rx_hash, | |
915 | &sg, sg.length); | |
916 | } | |
917 | crypto_hash_final(&tcp_conn->rx_hash, | |
918 | (u8 *) &tcp_conn->in.datadgst); | |
919 | debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); | |
920 | } | |
921 | ||
ca518684 MC |
922 | rc = iscsi_tcp_copy(conn, sizeof(uint32_t)); |
923 | if (rc) { | |
924 | if (rc == -EAGAIN) | |
925 | goto again; | |
926 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
927 | return 0; | |
928 | } | |
929 | ||
930 | memcpy(&recv_digest, conn->data, sizeof(uint32_t)); | |
5bb0b55a | 931 | if (recv_digest != tcp_conn->in.datadgst) { |
f6cfba1d MC |
932 | debug_tcp("iscsi_tcp: data digest error!" |
933 | "0x%x != 0x%x\n", recv_digest, | |
5bb0b55a | 934 | tcp_conn->in.datadgst); |
f6cfba1d MC |
935 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
936 | return 0; | |
937 | } else { | |
938 | debug_tcp("iscsi_tcp: data digest match!" | |
939 | "0x%x == 0x%x\n", recv_digest, | |
5bb0b55a MC |
940 | tcp_conn->in.datadgst); |
941 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
942 | } |
943 | } | |
944 | ||
5bb0b55a | 945 | if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && |
dbdb016d | 946 | tcp_conn->in.copy) { |
7ba24713 | 947 | debug_tcp("data_recv offset %d copy %d\n", |
5bb0b55a | 948 | tcp_conn->in.offset, tcp_conn->in.copy); |
7ba24713 AA |
949 | |
950 | rc = iscsi_data_recv(conn); | |
951 | if (rc) { | |
665b44ae | 952 | if (rc == -EAGAIN) |
7ba24713 | 953 | goto again; |
d82967c7 | 954 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
955 | return 0; |
956 | } | |
dbdb016d MC |
957 | |
958 | if (tcp_conn->in.padding) | |
959 | tcp_conn->in_progress = IN_PROGRESS_PAD_RECV; | |
960 | else if (conn->datadgst_en) | |
5bb0b55a | 961 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; |
dbdb016d MC |
962 | else |
963 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
964 | tcp_conn->data_copied = 0; | |
965 | } | |
966 | ||
967 | if (tcp_conn->in_progress == IN_PROGRESS_PAD_RECV && | |
968 | tcp_conn->in.copy) { | |
969 | int copylen = min(tcp_conn->in.padding - tcp_conn->data_copied, | |
970 | tcp_conn->in.copy); | |
971 | ||
972 | tcp_conn->in.copy -= copylen; | |
973 | tcp_conn->in.offset += copylen; | |
974 | tcp_conn->data_copied += copylen; | |
975 | ||
976 | if (tcp_conn->data_copied != tcp_conn->in.padding) | |
977 | tcp_conn->in_progress = IN_PROGRESS_PAD_RECV; | |
978 | else if (conn->datadgst_en) | |
979 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; | |
980 | else | |
5bb0b55a | 981 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
dbdb016d | 982 | tcp_conn->data_copied = 0; |
7ba24713 AA |
983 | } |
984 | ||
985 | debug_tcp("f, processed %d from out of %d padding %d\n", | |
5bb0b55a MC |
986 | tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); |
987 | BUG_ON(tcp_conn->in.offset - offset > len); | |
7ba24713 | 988 | |
5bb0b55a | 989 | if (tcp_conn->in.offset - offset != len) { |
7ba24713 | 990 | debug_tcp("continue to process %d bytes\n", |
5bb0b55a | 991 | (int)len - (tcp_conn->in.offset - offset)); |
7ba24713 AA |
992 | goto more; |
993 | } | |
994 | ||
995 | nomore: | |
5bb0b55a | 996 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
997 | BUG_ON(processed == 0); |
998 | return processed; | |
999 | ||
1000 | again: | |
5bb0b55a | 1001 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
1002 | debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", |
1003 | processed, (int)len, (int)rd_desc->count); | |
1004 | BUG_ON(processed == 0); | |
1005 | BUG_ON(processed > len); | |
1006 | ||
1007 | conn->rxdata_octets += processed; | |
1008 | return processed; | |
1009 | } | |
1010 | ||
1011 | static void | |
1012 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
1013 | { | |
1014 | struct iscsi_conn *conn = sk->sk_user_data; | |
1015 | read_descriptor_t rd_desc; | |
1016 | ||
1017 | read_lock(&sk->sk_callback_lock); | |
1018 | ||
665b44ae MC |
1019 | /* |
1020 | * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv. | |
1021 | * We set count to 1 because we want the network layer to | |
1022 | * hand us all the skbs that are available. iscsi_tcp_data_recv | |
1023 | * handled pdus that cross buffers or pdus that still need data. | |
1024 | */ | |
7ba24713 | 1025 | rd_desc.arg.data = conn; |
665b44ae | 1026 | rd_desc.count = 1; |
7ba24713 AA |
1027 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); |
1028 | ||
1029 | read_unlock(&sk->sk_callback_lock); | |
1030 | } | |
1031 | ||
1032 | static void | |
1033 | iscsi_tcp_state_change(struct sock *sk) | |
1034 | { | |
5bb0b55a | 1035 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
1036 | struct iscsi_conn *conn; |
1037 | struct iscsi_session *session; | |
1038 | void (*old_state_change)(struct sock *); | |
1039 | ||
1040 | read_lock(&sk->sk_callback_lock); | |
1041 | ||
1042 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
1043 | session = conn->session; | |
1044 | ||
e6273993 MC |
1045 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
1046 | sk->sk_state == TCP_CLOSE) && | |
1047 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
1048 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
1049 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1050 | } | |
1051 | ||
5bb0b55a MC |
1052 | tcp_conn = conn->dd_data; |
1053 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
1054 | |
1055 | read_unlock(&sk->sk_callback_lock); | |
1056 | ||
1057 | old_state_change(sk); | |
1058 | } | |
1059 | ||
1060 | /** | |
1061 | * iscsi_write_space - Called when more output buffer space is available | |
1062 | * @sk: socket space is available for | |
1063 | **/ | |
1064 | static void | |
1065 | iscsi_write_space(struct sock *sk) | |
1066 | { | |
1067 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1068 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1069 | ||
1070 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1071 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
55e3299d | 1072 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1073 | } |
1074 | ||
1075 | static void | |
1076 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1077 | { | |
5bb0b55a MC |
1078 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1079 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1080 | |
1081 | /* assign new callbacks */ | |
1082 | write_lock_bh(&sk->sk_callback_lock); | |
1083 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1084 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1085 | tcp_conn->old_state_change = sk->sk_state_change; | |
1086 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1087 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1088 | sk->sk_state_change = iscsi_tcp_state_change; | |
1089 | sk->sk_write_space = iscsi_write_space; | |
1090 | write_unlock_bh(&sk->sk_callback_lock); | |
1091 | } | |
1092 | ||
1093 | static void | |
1c83469d | 1094 | iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 1095 | { |
5bb0b55a | 1096 | struct sock *sk = tcp_conn->sock->sk; |
7ba24713 AA |
1097 | |
1098 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1099 | write_lock_bh(&sk->sk_callback_lock); | |
1100 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1101 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1102 | sk->sk_state_change = tcp_conn->old_state_change; | |
1103 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1104 | sk->sk_no_check = 0; |
1105 | write_unlock_bh(&sk->sk_callback_lock); | |
1106 | } | |
1107 | ||
1108 | /** | |
1109 | * iscsi_send - generic send routine | |
1110 | * @sk: kernel's socket | |
1111 | * @buf: buffer to write from | |
1112 | * @size: actual size to write | |
1113 | * @flags: socket's flags | |
7ba24713 AA |
1114 | */ |
1115 | static inline int | |
56851698 | 1116 | iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
7ba24713 | 1117 | { |
5bb0b55a MC |
1118 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1119 | struct socket *sk = tcp_conn->sock; | |
3219e529 | 1120 | int offset = buf->sg.offset + buf->sent, res; |
7ba24713 | 1121 | |
7cae5159 MC |
1122 | /* |
1123 | * if we got use_sg=0 or are sending something we kmallocd | |
1124 | * then we did not have to do kmap (kmap returns page_address) | |
1125 | * | |
1126 | * if we got use_sg > 0, but had to drop down, we do not | |
1127 | * set clustering so this should only happen for that | |
1128 | * slab case. | |
1129 | */ | |
1130 | if (buf->use_sendmsg) | |
3219e529 | 1131 | res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags); |
7cae5159 | 1132 | else |
3219e529 MC |
1133 | res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags); |
1134 | ||
1135 | if (res >= 0) { | |
1136 | conn->txdata_octets += res; | |
1137 | buf->sent += res; | |
1138 | return res; | |
1139 | } | |
1140 | ||
1141 | tcp_conn->sendpage_failures_cnt++; | |
1142 | if (res == -EAGAIN) | |
1143 | res = -ENOBUFS; | |
1144 | else | |
1145 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1146 | return res; | |
7ba24713 AA |
1147 | } |
1148 | ||
1149 | /** | |
1150 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() | |
1151 | * @conn: iscsi connection | |
1152 | * @buf: buffer to write from | |
1153 | * @datalen: lenght of data to be sent after the header | |
1154 | * | |
1155 | * Notes: | |
1156 | * (Tx, Fast Path) | |
1157 | **/ | |
1158 | static inline int | |
1159 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) | |
1160 | { | |
7ba24713 AA |
1161 | int flags = 0; /* MSG_DONTWAIT; */ |
1162 | int res, size; | |
1163 | ||
1164 | size = buf->sg.length - buf->sent; | |
1165 | BUG_ON(buf->sent + size > buf->sg.length); | |
1166 | if (buf->sent + size != buf->sg.length || datalen) | |
1167 | flags |= MSG_MORE; | |
1168 | ||
56851698 | 1169 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1170 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
1171 | if (res >= 0) { | |
7ba24713 AA |
1172 | if (size != res) |
1173 | return -EAGAIN; | |
1174 | return 0; | |
3219e529 | 1175 | } |
7ba24713 AA |
1176 | |
1177 | return res; | |
1178 | } | |
1179 | ||
1180 | /** | |
1181 | * iscsi_sendpage - send one page of iSCSI Data-Out. | |
1182 | * @conn: iscsi connection | |
1183 | * @buf: buffer to write from | |
1184 | * @count: remaining data | |
1185 | * @sent: number of bytes sent | |
1186 | * | |
1187 | * Notes: | |
1188 | * (Tx, Fast Path) | |
1189 | **/ | |
1190 | static inline int | |
1191 | iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, | |
1192 | int *count, int *sent) | |
1193 | { | |
7ba24713 AA |
1194 | int flags = 0; /* MSG_DONTWAIT; */ |
1195 | int res, size; | |
1196 | ||
1197 | size = buf->sg.length - buf->sent; | |
1198 | BUG_ON(buf->sent + size > buf->sg.length); | |
1199 | if (size > *count) | |
1200 | size = *count; | |
b13941f6 | 1201 | if (buf->sent + size != buf->sg.length || *count != size) |
7ba24713 AA |
1202 | flags |= MSG_MORE; |
1203 | ||
56851698 | 1204 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1205 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
1206 | size, buf->sent, *count, *sent, res); | |
1207 | if (res >= 0) { | |
7ba24713 AA |
1208 | *count -= res; |
1209 | *sent += res; | |
1210 | if (size != res) | |
1211 | return -EAGAIN; | |
1212 | return 0; | |
3219e529 | 1213 | } |
7ba24713 AA |
1214 | |
1215 | return res; | |
1216 | } | |
1217 | ||
1218 | static inline void | |
5bb0b55a | 1219 | iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
62f38300 | 1220 | struct iscsi_tcp_cmd_task *tcp_ctask) |
7ba24713 | 1221 | { |
c9802cd9 | 1222 | crypto_hash_init(&tcp_conn->tx_hash); |
5bb0b55a | 1223 | tcp_ctask->digest_count = 4; |
7ba24713 AA |
1224 | } |
1225 | ||
7ba24713 AA |
1226 | /** |
1227 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1228 | * @conn: iscsi connection | |
1229 | * @ctask: scsi command task | |
1230 | * @r2t: R2T info | |
1231 | * @left: bytes left to transfer | |
1232 | * | |
1233 | * Notes: | |
1234 | * Initialize next Data-Out within this R2T sequence and continue | |
1235 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1236 | * | |
1237 | * Called under connection lock. | |
1238 | **/ | |
1239 | static void | |
1240 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1241 | struct iscsi_r2t_info *r2t, int left) | |
1242 | { | |
1243 | struct iscsi_data *hdr; | |
7ba24713 AA |
1244 | struct scsi_cmnd *sc = ctask->sc; |
1245 | int new_offset; | |
1246 | ||
ffbfe925 | 1247 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
1248 | memset(hdr, 0, sizeof(struct iscsi_data)); |
1249 | hdr->ttt = r2t->ttt; | |
1250 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1251 | r2t->solicit_datasn++; | |
1252 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
1253 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
1254 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
1255 | hdr->exp_statsn = r2t->exp_statsn; |
1256 | new_offset = r2t->data_offset + r2t->sent; | |
1257 | hdr->offset = cpu_to_be32(new_offset); | |
1258 | if (left > conn->max_xmit_dlength) { | |
1259 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1260 | r2t->data_count = conn->max_xmit_dlength; | |
1261 | } else { | |
1262 | hton24(hdr->dlength, left); | |
1263 | r2t->data_count = left; | |
1264 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1265 | } | |
1266 | conn->dataout_pdus_cnt++; | |
1267 | ||
6e458cc9 | 1268 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 1269 | sizeof(struct iscsi_hdr)); |
7ba24713 | 1270 | |
62f38300 MC |
1271 | if (iscsi_buf_left(&r2t->sendbuf)) |
1272 | return; | |
1273 | ||
1274 | if (sc->use_sg) { | |
7ba24713 AA |
1275 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1276 | r2t->sg += 1; | |
62f38300 MC |
1277 | } else { |
1278 | iscsi_buf_init_iov(&r2t->sendbuf, | |
7ba24713 AA |
1279 | (char*)sc->request_buffer + new_offset, |
1280 | r2t->data_count); | |
62f38300 MC |
1281 | r2t->sg = NULL; |
1282 | } | |
7ba24713 AA |
1283 | } |
1284 | ||
62f38300 MC |
1285 | static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask, |
1286 | unsigned long len) | |
7ba24713 | 1287 | { |
62f38300 MC |
1288 | tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1); |
1289 | if (!tcp_ctask->pad_count) | |
1290 | return; | |
7ba24713 | 1291 | |
62f38300 MC |
1292 | tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count; |
1293 | debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count); | |
1294 | tcp_ctask->xmstate |= XMSTATE_W_PAD; | |
7ba24713 AA |
1295 | } |
1296 | ||
1297 | /** | |
5bb0b55a | 1298 | * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 AA |
1299 | * @conn: iscsi connection |
1300 | * @ctask: scsi command task | |
1301 | * @sc: scsi command | |
1302 | **/ | |
1303 | static void | |
5bb0b55a | 1304 | iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
7ba24713 | 1305 | { |
5bb0b55a | 1306 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1307 | |
5bb0b55a | 1308 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
218432c6 | 1309 | tcp_ctask->xmstate = XMSTATE_CMD_HDR_INIT; |
7ba24713 AA |
1310 | } |
1311 | ||
1312 | /** | |
5bb0b55a | 1313 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
7ba24713 AA |
1314 | * @conn: iscsi connection |
1315 | * @mtask: task management task | |
1316 | * | |
1317 | * Notes: | |
1318 | * The function can return -EAGAIN in which case caller must | |
1319 | * call it again later, or recover. '0' return code means successful | |
1320 | * xmit. | |
1321 | * | |
218432c6 MC |
1322 | * Management xmit state machine consists of these states: |
1323 | * XMSTATE_IMM_HDR_INIT - calculate digest of PDU Header | |
1324 | * XMSTATE_IMM_HDR - PDU Header xmit in progress | |
1325 | * XMSTATE_IMM_DATA - PDU Data xmit in progress | |
1326 | * XMSTATE_IDLE - management PDU is done | |
7ba24713 AA |
1327 | **/ |
1328 | static int | |
5bb0b55a | 1329 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1330 | { |
5bb0b55a | 1331 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
3219e529 | 1332 | int rc; |
7ba24713 AA |
1333 | |
1334 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", | |
5bb0b55a | 1335 | conn->id, tcp_mtask->xmstate, mtask->itt); |
7ba24713 | 1336 | |
218432c6 MC |
1337 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR_INIT) { |
1338 | iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr, | |
1339 | sizeof(struct iscsi_hdr)); | |
1340 | ||
1341 | if (mtask->data_count) { | |
5bb0b55a | 1342 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
218432c6 MC |
1343 | iscsi_buf_init_iov(&tcp_mtask->sendbuf, |
1344 | (char*)mtask->data, | |
1345 | mtask->data_count); | |
1346 | } | |
1347 | ||
af973481 | 1348 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
30a6c652 | 1349 | conn->stop_stage != STOP_CONN_RECOVER && |
af973481 | 1350 | conn->hdrdgst_en) |
5bb0b55a MC |
1351 | iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
1352 | (u8*)tcp_mtask->hdrext); | |
218432c6 MC |
1353 | |
1354 | tcp_mtask->sent = 0; | |
1355 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR_INIT; | |
1356 | tcp_mtask->xmstate |= XMSTATE_IMM_HDR; | |
1357 | } | |
1358 | ||
1359 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { | |
3219e529 MC |
1360 | rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf, |
1361 | mtask->data_count); | |
218432c6 | 1362 | if (rc) |
3219e529 | 1363 | return rc; |
218432c6 | 1364 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; |
7ba24713 AA |
1365 | } |
1366 | ||
5bb0b55a | 1367 | if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 | 1368 | BUG_ON(!mtask->data_count); |
5bb0b55a | 1369 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1370 | /* FIXME: implement. |
1371 | * Virtual buffer could be spreaded across multiple pages... | |
1372 | */ | |
1373 | do { | |
3219e529 MC |
1374 | int rc; |
1375 | ||
1376 | rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf, | |
1377 | &mtask->data_count, &tcp_mtask->sent); | |
1378 | if (rc) { | |
5bb0b55a | 1379 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
3219e529 | 1380 | return rc; |
7ba24713 AA |
1381 | } |
1382 | } while (mtask->data_count); | |
1383 | } | |
1384 | ||
5bb0b55a | 1385 | BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
b4377356 | 1386 | if (mtask->hdr->itt == RESERVED_ITT) { |
5bb0b55a MC |
1387 | struct iscsi_session *session = conn->session; |
1388 | ||
1389 | spin_lock_bh(&session->lock); | |
1390 | list_del(&conn->mtask->running); | |
1391 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, | |
1392 | sizeof(void*)); | |
1393 | spin_unlock_bh(&session->lock); | |
1394 | } | |
7ba24713 AA |
1395 | return 0; |
1396 | } | |
1397 | ||
218432c6 MC |
1398 | static int |
1399 | iscsi_send_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1400 | { |
218432c6 MC |
1401 | struct scsi_cmnd *sc = ctask->sc; |
1402 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1403 | int rc = 0; | |
3219e529 | 1404 | |
218432c6 MC |
1405 | if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_INIT) { |
1406 | tcp_ctask->sent = 0; | |
1407 | tcp_ctask->sg_count = 0; | |
1408 | tcp_ctask->exp_datasn = 0; | |
1409 | ||
1410 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
1411 | if (sc->use_sg) { | |
1412 | struct scatterlist *sg = sc->request_buffer; | |
1413 | ||
1414 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg); | |
1415 | tcp_ctask->sg = sg + 1; | |
1416 | tcp_ctask->bad_sg = sg + sc->use_sg; | |
1417 | } else { | |
1418 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, | |
1419 | sc->request_buffer, | |
1420 | sc->request_bufflen); | |
1421 | tcp_ctask->sg = NULL; | |
1422 | tcp_ctask->bad_sg = NULL; | |
1423 | } | |
7ba24713 | 1424 | |
218432c6 MC |
1425 | debug_scsi("cmd [itt 0x%x total %d imm_data %d " |
1426 | "unsol count %d, unsol offset %d]\n", | |
1427 | ctask->itt, sc->request_bufflen, | |
1428 | ctask->imm_count, ctask->unsol_count, | |
1429 | ctask->unsol_offset); | |
1430 | } | |
5bb0b55a | 1431 | |
218432c6 MC |
1432 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, |
1433 | sizeof(struct iscsi_hdr)); | |
1434 | ||
1435 | if (conn->hdrdgst_en) | |
1436 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, | |
1437 | (u8*)tcp_ctask->hdrext); | |
1438 | tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_INIT; | |
1439 | tcp_ctask->xmstate |= XMSTATE_CMD_HDR_XMIT; | |
62f38300 MC |
1440 | } |
1441 | ||
218432c6 MC |
1442 | if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_XMIT) { |
1443 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count); | |
1444 | if (rc) | |
1445 | return rc; | |
1446 | tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_XMIT; | |
1447 | ||
1448 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
1449 | return 0; | |
1450 | ||
1451 | if (ctask->imm_count) { | |
1452 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; | |
1453 | iscsi_set_padding(tcp_ctask, ctask->imm_count); | |
62f38300 | 1454 | |
218432c6 MC |
1455 | if (ctask->conn->datadgst_en) { |
1456 | iscsi_data_digest_init(ctask->conn->dd_data, | |
1457 | tcp_ctask); | |
1458 | tcp_ctask->immdigest = 0; | |
1459 | } | |
62f38300 | 1460 | } |
62f38300 | 1461 | |
218432c6 MC |
1462 | if (ctask->unsol_count) |
1463 | tcp_ctask->xmstate |= | |
1464 | XMSTATE_UNS_HDR | XMSTATE_UNS_INIT; | |
1465 | } | |
1466 | return rc; | |
7ba24713 AA |
1467 | } |
1468 | ||
62f38300 MC |
1469 | static int |
1470 | iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1471 | { |
5bb0b55a | 1472 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
62f38300 MC |
1473 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1474 | int sent = 0, rc; | |
5bb0b55a | 1475 | |
62f38300 MC |
1476 | if (tcp_ctask->xmstate & XMSTATE_W_PAD) { |
1477 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, | |
1478 | tcp_ctask->pad_count); | |
1479 | if (conn->datadgst_en) | |
c9802cd9 JB |
1480 | crypto_hash_update(&tcp_conn->tx_hash, |
1481 | &tcp_ctask->sendbuf.sg, | |
1482 | tcp_ctask->sendbuf.sg.length); | |
62f38300 MC |
1483 | } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD)) |
1484 | return 0; | |
1485 | ||
1486 | tcp_ctask->xmstate &= ~XMSTATE_W_PAD; | |
1487 | tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD; | |
1488 | debug_scsi("sending %d pad bytes for itt 0x%x\n", | |
1489 | tcp_ctask->pad_count, ctask->itt); | |
1490 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, | |
1491 | &sent); | |
3219e529 | 1492 | if (rc) { |
62f38300 MC |
1493 | debug_scsi("padding send failed %d\n", rc); |
1494 | tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD; | |
7ba24713 | 1495 | } |
3219e529 | 1496 | return rc; |
7ba24713 AA |
1497 | } |
1498 | ||
62f38300 MC |
1499 | static int |
1500 | iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1501 | struct iscsi_buf *buf, uint32_t *digest) | |
7ba24713 | 1502 | { |
62f38300 MC |
1503 | struct iscsi_tcp_cmd_task *tcp_ctask; |
1504 | struct iscsi_tcp_conn *tcp_conn; | |
1505 | int rc, sent = 0; | |
5bb0b55a | 1506 | |
62f38300 MC |
1507 | if (!conn->datadgst_en) |
1508 | return 0; | |
7ba24713 | 1509 | |
62f38300 MC |
1510 | tcp_ctask = ctask->dd_data; |
1511 | tcp_conn = conn->dd_data; | |
7ba24713 | 1512 | |
62f38300 | 1513 | if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) { |
c9802cd9 | 1514 | crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest); |
62f38300 MC |
1515 | iscsi_buf_init_iov(buf, (char*)digest, 4); |
1516 | } | |
1517 | tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST; | |
7ba24713 | 1518 | |
62f38300 MC |
1519 | rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
1520 | if (!rc) | |
1521 | debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest, | |
1522 | ctask->itt); | |
1523 | else { | |
1524 | debug_scsi("sending digest 0x%x failed for itt 0x%x!\n", | |
1525 | *digest, ctask->itt); | |
1526 | tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST; | |
7ba24713 | 1527 | } |
62f38300 MC |
1528 | return rc; |
1529 | } | |
7ba24713 | 1530 | |
62f38300 MC |
1531 | static int |
1532 | iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf, | |
1533 | struct scatterlist **sg, int *sent, int *count, | |
1534 | struct iscsi_buf *digestbuf, uint32_t *digest) | |
1535 | { | |
1536 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1537 | struct iscsi_conn *conn = ctask->conn; | |
1538 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1539 | int rc, buf_sent, offset; | |
1540 | ||
1541 | while (*count) { | |
1542 | buf_sent = 0; | |
1543 | offset = sendbuf->sent; | |
1544 | ||
1545 | rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent); | |
1546 | *sent = *sent + buf_sent; | |
1547 | if (buf_sent && conn->datadgst_en) | |
c9802cd9 | 1548 | partial_sg_digest_update(&tcp_conn->tx_hash, |
62f38300 MC |
1549 | &sendbuf->sg, sendbuf->sg.offset + offset, |
1550 | buf_sent); | |
1551 | if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) { | |
1552 | iscsi_buf_init_sg(sendbuf, *sg); | |
1553 | *sg = *sg + 1; | |
7ba24713 | 1554 | } |
62f38300 MC |
1555 | |
1556 | if (rc) | |
1557 | return rc; | |
7ba24713 AA |
1558 | } |
1559 | ||
62f38300 MC |
1560 | rc = iscsi_send_padding(conn, ctask); |
1561 | if (rc) | |
1562 | return rc; | |
1563 | ||
1564 | return iscsi_send_digest(conn, ctask, digestbuf, digest); | |
7ba24713 AA |
1565 | } |
1566 | ||
62f38300 MC |
1567 | static int |
1568 | iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1569 | { |
5bb0b55a | 1570 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1571 | struct iscsi_data_task *dtask; |
3219e529 | 1572 | int rc; |
7ba24713 | 1573 | |
5bb0b55a MC |
1574 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
1575 | if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { | |
62f38300 MC |
1576 | dtask = &tcp_ctask->unsol_dtask; |
1577 | ||
ffd0436e MC |
1578 | iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr); |
1579 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, | |
1580 | sizeof(struct iscsi_hdr)); | |
af973481 | 1581 | if (conn->hdrdgst_en) |
5bb0b55a | 1582 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
af973481 | 1583 | (u8*)dtask->hdrext); |
62f38300 | 1584 | |
5bb0b55a | 1585 | tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
62f38300 | 1586 | iscsi_set_padding(tcp_ctask, ctask->data_count); |
7ba24713 | 1587 | } |
3219e529 MC |
1588 | |
1589 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count); | |
1590 | if (rc) { | |
5bb0b55a MC |
1591 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
1592 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR; | |
3219e529 | 1593 | return rc; |
7ba24713 AA |
1594 | } |
1595 | ||
dd8c0d95 MC |
1596 | if (conn->datadgst_en) { |
1597 | dtask = &tcp_ctask->unsol_dtask; | |
1598 | iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask); | |
1599 | dtask->digest = 0; | |
1600 | } | |
1601 | ||
7ba24713 | 1602 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", |
5bb0b55a | 1603 | ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
7ba24713 AA |
1604 | return 0; |
1605 | } | |
1606 | ||
62f38300 MC |
1607 | static int |
1608 | iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1609 | { |
5bb0b55a | 1610 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1611 | int rc; |
7ba24713 | 1612 | |
62f38300 MC |
1613 | if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
1614 | BUG_ON(!ctask->unsol_count); | |
1615 | tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; | |
1616 | send_hdr: | |
1617 | rc = iscsi_send_unsol_hdr(conn, ctask); | |
1618 | if (rc) | |
1619 | return rc; | |
7ba24713 AA |
1620 | } |
1621 | ||
62f38300 MC |
1622 | if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
1623 | struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask; | |
5bb0b55a | 1624 | int start = tcp_ctask->sent; |
7ba24713 | 1625 | |
62f38300 MC |
1626 | rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg, |
1627 | &tcp_ctask->sent, &ctask->data_count, | |
1628 | &dtask->digestbuf, &dtask->digest); | |
5bb0b55a | 1629 | ctask->unsol_count -= tcp_ctask->sent - start; |
62f38300 MC |
1630 | if (rc) |
1631 | return rc; | |
1632 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; | |
7ba24713 | 1633 | /* |
62f38300 MC |
1634 | * Done with the Data-Out. Next, check if we need |
1635 | * to send another unsolicited Data-Out. | |
7ba24713 | 1636 | */ |
62f38300 MC |
1637 | if (ctask->unsol_count) { |
1638 | debug_scsi("sending more uns\n"); | |
1639 | tcp_ctask->xmstate |= XMSTATE_UNS_INIT; | |
1640 | goto send_hdr; | |
7ba24713 | 1641 | } |
7ba24713 | 1642 | } |
7ba24713 AA |
1643 | return 0; |
1644 | } | |
1645 | ||
62f38300 MC |
1646 | static int iscsi_send_sol_pdu(struct iscsi_conn *conn, |
1647 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1648 | { |
5bb0b55a | 1649 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
62f38300 MC |
1650 | struct iscsi_session *session = conn->session; |
1651 | struct iscsi_r2t_info *r2t; | |
1652 | struct iscsi_data_task *dtask; | |
3219e529 | 1653 | int left, rc; |
7ba24713 | 1654 | |
218432c6 | 1655 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR_INIT) { |
db37c505 MC |
1656 | if (!tcp_ctask->r2t) { |
1657 | spin_lock_bh(&session->lock); | |
62f38300 MC |
1658 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, |
1659 | sizeof(void*)); | |
db37c505 MC |
1660 | spin_unlock_bh(&session->lock); |
1661 | } | |
62f38300 MC |
1662 | send_hdr: |
1663 | r2t = tcp_ctask->r2t; | |
1664 | dtask = &r2t->dtask; | |
7ba24713 | 1665 | |
62f38300 MC |
1666 | if (conn->hdrdgst_en) |
1667 | iscsi_hdr_digest(conn, &r2t->headbuf, | |
1668 | (u8*)dtask->hdrext); | |
218432c6 MC |
1669 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR_INIT; |
1670 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
1671 | } | |
1672 | ||
1673 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { | |
1674 | r2t = tcp_ctask->r2t; | |
1675 | dtask = &r2t->dtask; | |
1676 | ||
62f38300 | 1677 | rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count); |
218432c6 | 1678 | if (rc) |
3219e529 | 1679 | return rc; |
218432c6 MC |
1680 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
1681 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
7ba24713 | 1682 | |
7ba24713 | 1683 | if (conn->datadgst_en) { |
dd8c0d95 MC |
1684 | iscsi_data_digest_init(conn->dd_data, tcp_ctask); |
1685 | dtask->digest = 0; | |
7ba24713 | 1686 | } |
7ba24713 | 1687 | |
62f38300 MC |
1688 | iscsi_set_padding(tcp_ctask, r2t->data_count); |
1689 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", | |
1690 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, | |
1691 | r2t->sent); | |
7ba24713 AA |
1692 | } |
1693 | ||
62f38300 MC |
1694 | if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
1695 | r2t = tcp_ctask->r2t; | |
1696 | dtask = &r2t->dtask; | |
7ba24713 | 1697 | |
62f38300 MC |
1698 | rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg, |
1699 | &r2t->sent, &r2t->data_count, | |
1700 | &dtask->digestbuf, &dtask->digest); | |
1701 | if (rc) | |
1702 | return rc; | |
1703 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; | |
7ba24713 | 1704 | |
62f38300 MC |
1705 | /* |
1706 | * Done with this Data-Out. Next, check if we have | |
1707 | * to send another Data-Out for this R2T. | |
1708 | */ | |
1709 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1710 | left = r2t->data_length - r2t->sent; | |
1711 | if (left) { | |
1712 | iscsi_solicit_data_cont(conn, ctask, r2t, left); | |
62f38300 MC |
1713 | goto send_hdr; |
1714 | } | |
7ba24713 | 1715 | |
62f38300 MC |
1716 | /* |
1717 | * Done with this R2T. Check if there are more | |
1718 | * outstanding R2Ts ready to be processed. | |
1719 | */ | |
1720 | spin_lock_bh(&session->lock); | |
1721 | tcp_ctask->r2t = NULL; | |
1722 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
1723 | sizeof(void*)); | |
1724 | if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, | |
1725 | sizeof(void*))) { | |
1726 | tcp_ctask->r2t = r2t; | |
62f38300 MC |
1727 | spin_unlock_bh(&session->lock); |
1728 | goto send_hdr; | |
7ba24713 | 1729 | } |
62f38300 | 1730 | spin_unlock_bh(&session->lock); |
7ba24713 | 1731 | } |
7ba24713 AA |
1732 | return 0; |
1733 | } | |
1734 | ||
218432c6 MC |
1735 | /** |
1736 | * iscsi_tcp_ctask_xmit - xmit normal PDU task | |
1737 | * @conn: iscsi connection | |
1738 | * @ctask: iscsi command task | |
1739 | * | |
1740 | * Notes: | |
1741 | * The function can return -EAGAIN in which case caller must | |
1742 | * call it again later, or recover. '0' return code means successful | |
1743 | * xmit. | |
1744 | * The function is devided to logical helpers (above) for the different | |
1745 | * xmit stages. | |
1746 | * | |
1747 | *iscsi_send_cmd_hdr() | |
1748 | * XMSTATE_CMD_HDR_INIT - prepare Header and Data buffers Calculate | |
1749 | * Header Digest | |
1750 | * XMSTATE_CMD_HDR_XMIT - Transmit header in progress | |
1751 | * | |
1752 | *iscsi_send_padding | |
1753 | * XMSTATE_W_PAD - Prepare and send pading | |
1754 | * XMSTATE_W_RESEND_PAD - retry send pading | |
1755 | * | |
1756 | *iscsi_send_digest | |
1757 | * XMSTATE_W_RESEND_DATA_DIGEST - Finalize and send Data Digest | |
1758 | * XMSTATE_W_RESEND_DATA_DIGEST - retry sending digest | |
1759 | * | |
1760 | *iscsi_send_unsol_hdr | |
1761 | * XMSTATE_UNS_INIT - prepare un-solicit data header and digest | |
1762 | * XMSTATE_UNS_HDR - send un-solicit header | |
1763 | * | |
1764 | *iscsi_send_unsol_pdu | |
1765 | * XMSTATE_UNS_DATA - send un-solicit data in progress | |
1766 | * | |
1767 | *iscsi_send_sol_pdu | |
1768 | * XMSTATE_SOL_HDR_INIT - solicit data header and digest initialize | |
1769 | * XMSTATE_SOL_HDR - send solicit header | |
1770 | * XMSTATE_SOL_DATA - send solicit data | |
1771 | * | |
1772 | *iscsi_tcp_ctask_xmit | |
1773 | * XMSTATE_IMM_DATA - xmit managment data (??) | |
1774 | **/ | |
7ba24713 | 1775 | static int |
5bb0b55a | 1776 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 1777 | { |
5bb0b55a | 1778 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1779 | int rc = 0; |
1780 | ||
1781 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", | |
5bb0b55a | 1782 | conn->id, tcp_ctask->xmstate, ctask->itt); |
7ba24713 | 1783 | |
218432c6 MC |
1784 | rc = iscsi_send_cmd_hdr(conn, ctask); |
1785 | if (rc) | |
1786 | return rc; | |
1787 | if (ctask->sc->sc_data_direction != DMA_TO_DEVICE) | |
1788 | return 0; | |
7ba24713 | 1789 | |
5bb0b55a | 1790 | if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
62f38300 MC |
1791 | rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg, |
1792 | &tcp_ctask->sent, &ctask->imm_count, | |
1793 | &tcp_ctask->immbuf, &tcp_ctask->immdigest); | |
7ba24713 AA |
1794 | if (rc) |
1795 | return rc; | |
62f38300 | 1796 | tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1797 | } |
1798 | ||
62f38300 MC |
1799 | rc = iscsi_send_unsol_pdu(conn, ctask); |
1800 | if (rc) | |
1801 | return rc; | |
7ba24713 | 1802 | |
62f38300 MC |
1803 | rc = iscsi_send_sol_pdu(conn, ctask); |
1804 | if (rc) | |
1805 | return rc; | |
7ba24713 AA |
1806 | |
1807 | return rc; | |
1808 | } | |
1809 | ||
5bb0b55a MC |
1810 | static struct iscsi_cls_conn * |
1811 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1812 | { |
5bb0b55a MC |
1813 | struct iscsi_conn *conn; |
1814 | struct iscsi_cls_conn *cls_conn; | |
1815 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1816 | |
5bb0b55a MC |
1817 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
1818 | if (!cls_conn) | |
1819 | return NULL; | |
1820 | conn = cls_conn->dd_data; | |
7ba24713 | 1821 | /* |
5bb0b55a MC |
1822 | * due to strange issues with iser these are not set |
1823 | * in iscsi_conn_setup | |
7ba24713 | 1824 | */ |
bf32ed33 | 1825 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; |
7ba24713 | 1826 | |
5bb0b55a MC |
1827 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
1828 | if (!tcp_conn) | |
1829 | goto tcp_conn_alloc_fail; | |
7ba24713 | 1830 | |
5bb0b55a MC |
1831 | conn->dd_data = tcp_conn; |
1832 | tcp_conn->iscsi_conn = conn; | |
1833 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
1834 | /* initial operational parameters */ | |
1835 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); | |
7ba24713 | 1836 | |
c9802cd9 JB |
1837 | tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1838 | CRYPTO_ALG_ASYNC); | |
1839 | tcp_conn->tx_hash.flags = 0; | |
0f238418 MC |
1840 | if (IS_ERR(tcp_conn->tx_hash.tfm)) { |
1841 | printk(KERN_ERR "Could not create connection due to crc32c " | |
1842 | "loading error %ld. Make sure the crc32c module is " | |
1843 | "built as a module or into the kernel\n", | |
1844 | PTR_ERR(tcp_conn->tx_hash.tfm)); | |
dd8c0d95 | 1845 | goto free_tcp_conn; |
0f238418 | 1846 | } |
dd8c0d95 | 1847 | |
c9802cd9 JB |
1848 | tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1849 | CRYPTO_ALG_ASYNC); | |
1850 | tcp_conn->rx_hash.flags = 0; | |
0f238418 MC |
1851 | if (IS_ERR(tcp_conn->rx_hash.tfm)) { |
1852 | printk(KERN_ERR "Could not create connection due to crc32c " | |
1853 | "loading error %ld. Make sure the crc32c module is " | |
1854 | "built as a module or into the kernel\n", | |
1855 | PTR_ERR(tcp_conn->rx_hash.tfm)); | |
dd8c0d95 | 1856 | goto free_tx_tfm; |
0f238418 | 1857 | } |
dd8c0d95 | 1858 | |
5bb0b55a | 1859 | return cls_conn; |
7ba24713 | 1860 | |
dd8c0d95 | 1861 | free_tx_tfm: |
c9802cd9 | 1862 | crypto_free_hash(tcp_conn->tx_hash.tfm); |
dd8c0d95 MC |
1863 | free_tcp_conn: |
1864 | kfree(tcp_conn); | |
5bb0b55a MC |
1865 | tcp_conn_alloc_fail: |
1866 | iscsi_conn_teardown(cls_conn); | |
1867 | return NULL; | |
7ba24713 AA |
1868 | } |
1869 | ||
1c83469d MC |
1870 | static void |
1871 | iscsi_tcp_release_conn(struct iscsi_conn *conn) | |
1872 | { | |
1873 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1874 | ||
1875 | if (!tcp_conn->sock) | |
1876 | return; | |
1877 | ||
1878 | sock_hold(tcp_conn->sock->sk); | |
1879 | iscsi_conn_restore_callbacks(tcp_conn); | |
1880 | sock_put(tcp_conn->sock->sk); | |
1881 | ||
4e7aba73 | 1882 | sockfd_put(tcp_conn->sock); |
1c83469d MC |
1883 | tcp_conn->sock = NULL; |
1884 | conn->recv_lock = NULL; | |
1885 | } | |
1886 | ||
7ba24713 | 1887 | static void |
5bb0b55a | 1888 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1889 | { |
5bb0b55a MC |
1890 | struct iscsi_conn *conn = cls_conn->dd_data; |
1891 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 | 1892 | |
1c83469d | 1893 | iscsi_tcp_release_conn(conn); |
5bb0b55a | 1894 | iscsi_conn_teardown(cls_conn); |
7ba24713 | 1895 | |
534284a0 PW |
1896 | if (tcp_conn->tx_hash.tfm) |
1897 | crypto_free_hash(tcp_conn->tx_hash.tfm); | |
1898 | if (tcp_conn->rx_hash.tfm) | |
1899 | crypto_free_hash(tcp_conn->rx_hash.tfm); | |
7ba24713 | 1900 | |
5bb0b55a MC |
1901 | kfree(tcp_conn); |
1902 | } | |
7ba24713 | 1903 | |
1c83469d MC |
1904 | static void |
1905 | iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1906 | { | |
1907 | struct iscsi_conn *conn = cls_conn->dd_data; | |
d5390f5f | 1908 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1c83469d MC |
1909 | |
1910 | iscsi_conn_stop(cls_conn, flag); | |
1911 | iscsi_tcp_release_conn(conn); | |
d5390f5f | 1912 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
1c83469d MC |
1913 | } |
1914 | ||
5bb0b55a MC |
1915 | static int |
1916 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1917 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1918 | int is_leading) |
1919 | { | |
1920 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1921 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1922 | struct sock *sk; | |
1923 | struct socket *sock; | |
1924 | int err; | |
7ba24713 | 1925 | |
5bb0b55a | 1926 | /* lookup for existing socket */ |
264faaaa | 1927 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a MC |
1928 | if (!sock) { |
1929 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); | |
1930 | return -EEXIST; | |
7ba24713 AA |
1931 | } |
1932 | ||
5bb0b55a MC |
1933 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
1934 | if (err) | |
1935 | return err; | |
7ba24713 | 1936 | |
67a61114 MC |
1937 | /* bind iSCSI connection and socket */ |
1938 | tcp_conn->sock = sock; | |
7ba24713 | 1939 | |
67a61114 MC |
1940 | /* setup Socket parameters */ |
1941 | sk = sock->sk; | |
1942 | sk->sk_reuse = 1; | |
1943 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
1944 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 1945 | |
67a61114 | 1946 | /* FIXME: disable Nagle's algorithm */ |
7ba24713 | 1947 | |
67a61114 MC |
1948 | /* |
1949 | * Intercept TCP callbacks for sendfile like receive | |
1950 | * processing. | |
1951 | */ | |
1952 | conn->recv_lock = &sk->sk_callback_lock; | |
1953 | iscsi_conn_set_callbacks(conn); | |
1954 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; | |
1955 | /* | |
1956 | * set receive state machine into initial state | |
1957 | */ | |
1958 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 | 1959 | |
7ba24713 AA |
1960 | return 0; |
1961 | } | |
1962 | ||
5bb0b55a | 1963 | /* called with host lock */ |
30a6c652 | 1964 | static void |
77a23c21 | 1965 | iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1966 | { |
5bb0b55a | 1967 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
218432c6 | 1968 | tcp_mtask->xmstate = XMSTATE_IMM_HDR_INIT; |
7ba24713 AA |
1969 | } |
1970 | ||
1971 | static int | |
1972 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
1973 | { | |
1974 | int i; | |
1975 | int cmd_i; | |
1976 | ||
1977 | /* | |
1978 | * initialize per-task: R2T pool and xmit queue | |
1979 | */ | |
1980 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1981 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
5bb0b55a | 1982 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1983 | |
1984 | /* | |
1985 | * pre-allocated x4 as much r2ts to handle race when | |
1986 | * target acks DataOut faster than we data_xmit() queues | |
1987 | * could replenish r2tqueue. | |
1988 | */ | |
1989 | ||
1990 | /* R2T pool */ | |
5bb0b55a MC |
1991 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
1992 | (void***)&tcp_ctask->r2ts, | |
1993 | sizeof(struct iscsi_r2t_info))) { | |
7ba24713 AA |
1994 | goto r2t_alloc_fail; |
1995 | } | |
1996 | ||
1997 | /* R2T xmit queue */ | |
5bb0b55a | 1998 | tcp_ctask->r2tqueue = kfifo_alloc( |
7ba24713 | 1999 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
5bb0b55a MC |
2000 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
2001 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2002 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2003 | goto r2t_alloc_fail; |
2004 | } | |
7ba24713 AA |
2005 | } |
2006 | ||
2007 | return 0; | |
2008 | ||
2009 | r2t_alloc_fail: | |
2010 | for (i = 0; i < cmd_i; i++) { | |
5bb0b55a MC |
2011 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2012 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2013 | ||
5bb0b55a MC |
2014 | kfifo_free(tcp_ctask->r2tqueue); |
2015 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2016 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2017 | } |
2018 | return -ENOMEM; | |
2019 | } | |
2020 | ||
2021 | static void | |
2022 | iscsi_r2tpool_free(struct iscsi_session *session) | |
2023 | { | |
2024 | int i; | |
2025 | ||
2026 | for (i = 0; i < session->cmds_max; i++) { | |
5bb0b55a MC |
2027 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2028 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 2029 | |
5bb0b55a MC |
2030 | kfifo_free(tcp_ctask->r2tqueue); |
2031 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2032 | (void**)tcp_ctask->r2ts); | |
7ba24713 | 2033 | } |
7ba24713 AA |
2034 | } |
2035 | ||
2036 | static int | |
7b7232f3 | 2037 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
5c75b7fc | 2038 | char *buf, int buflen) |
7ba24713 | 2039 | { |
7b7232f3 | 2040 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 2041 | struct iscsi_session *session = conn->session; |
5bb0b55a | 2042 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5c75b7fc | 2043 | int value; |
7ba24713 | 2044 | |
7ba24713 | 2045 | switch(param) { |
7ba24713 | 2046 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 2047 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a | 2048 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
dd8c0d95 | 2049 | if (conn->hdrdgst_en) |
5bb0b55a | 2050 | tcp_conn->hdr_size += sizeof(__u32); |
7ba24713 AA |
2051 | break; |
2052 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 2053 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a MC |
2054 | tcp_conn->sendpage = conn->datadgst_en ? |
2055 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 | 2056 | break; |
7ba24713 | 2057 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 2058 | sscanf(buf, "%d", &value); |
7ba24713 AA |
2059 | if (session->max_r2t == roundup_pow_of_two(value)) |
2060 | break; | |
2061 | iscsi_r2tpool_free(session); | |
5c75b7fc | 2062 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2063 | if (session->max_r2t & (session->max_r2t - 1)) |
2064 | session->max_r2t = roundup_pow_of_two(session->max_r2t); | |
2065 | if (iscsi_r2tpool_alloc(session)) | |
2066 | return -ENOMEM; | |
2067 | break; | |
7ba24713 | 2068 | default: |
5c75b7fc | 2069 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2070 | } |
2071 | ||
2072 | return 0; | |
2073 | } | |
2074 | ||
2075 | static int | |
5c75b7fc MC |
2076 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
2077 | enum iscsi_param param, char *buf) | |
7b8631b5 | 2078 | { |
7b7232f3 | 2079 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2080 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
fd7255f5 | 2081 | struct inet_sock *inet; |
5c75b7fc MC |
2082 | struct ipv6_pinfo *np; |
2083 | struct sock *sk; | |
2084 | int len; | |
7b8631b5 MC |
2085 | |
2086 | switch(param) { | |
fd7255f5 | 2087 | case ISCSI_PARAM_CONN_PORT: |
77a23c21 | 2088 | if (!tcp_conn->sock) |
fd7255f5 | 2089 | return -EINVAL; |
fd7255f5 | 2090 | |
5bb0b55a | 2091 | inet = inet_sk(tcp_conn->sock->sk); |
5c75b7fc | 2092 | len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport)); |
8d2860b3 | 2093 | break; |
fd7255f5 | 2094 | case ISCSI_PARAM_CONN_ADDRESS: |
77a23c21 | 2095 | if (!tcp_conn->sock) |
fd7255f5 | 2096 | return -EINVAL; |
fd7255f5 | 2097 | |
5bb0b55a | 2098 | sk = tcp_conn->sock->sk; |
fd7255f5 MC |
2099 | if (sk->sk_family == PF_INET) { |
2100 | inet = inet_sk(sk); | |
94cb3f82 | 2101 | len = sprintf(buf, NIPQUAD_FMT "\n", |
fd7255f5 MC |
2102 | NIPQUAD(inet->daddr)); |
2103 | } else { | |
2104 | np = inet6_sk(sk); | |
94cb3f82 | 2105 | len = sprintf(buf, NIP6_FMT "\n", NIP6(np->daddr)); |
fd7255f5 | 2106 | } |
fd7255f5 MC |
2107 | break; |
2108 | default: | |
5c75b7fc | 2109 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
2110 | } |
2111 | ||
2112 | return len; | |
2113 | } | |
2114 | ||
7ba24713 | 2115 | static void |
7b7232f3 | 2116 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 2117 | { |
7b7232f3 | 2118 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2119 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
2120 | |
2121 | stats->txdata_octets = conn->txdata_octets; | |
2122 | stats->rxdata_octets = conn->rxdata_octets; | |
2123 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
2124 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
2125 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
2126 | stats->datain_pdus = conn->datain_pdus_cnt; | |
2127 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
2128 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
2129 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
2130 | stats->custom_length = 3; | |
2131 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 2132 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 2133 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 2134 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
2135 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
2136 | stats->custom[2].value = conn->eh_abort_cnt; | |
2137 | } | |
2138 | ||
5bb0b55a MC |
2139 | static struct iscsi_cls_session * |
2140 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, | |
2141 | struct scsi_transport_template *scsit, | |
1548271e | 2142 | uint16_t cmds_max, uint16_t qdepth, |
5bb0b55a | 2143 | uint32_t initial_cmdsn, uint32_t *hostno) |
7ba24713 | 2144 | { |
5bb0b55a MC |
2145 | struct iscsi_cls_session *cls_session; |
2146 | struct iscsi_session *session; | |
2147 | uint32_t hn; | |
2148 | int cmd_i; | |
7ba24713 | 2149 | |
1548271e | 2150 | cls_session = iscsi_session_setup(iscsit, scsit, cmds_max, qdepth, |
5bb0b55a MC |
2151 | sizeof(struct iscsi_tcp_cmd_task), |
2152 | sizeof(struct iscsi_tcp_mgmt_task), | |
2153 | initial_cmdsn, &hn); | |
2154 | if (!cls_session) | |
2155 | return NULL; | |
2156 | *hostno = hn; | |
7ba24713 | 2157 | |
5bb0b55a MC |
2158 | session = class_to_transport_session(cls_session); |
2159 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2160 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
2161 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2162 | ||
2163 | ctask->hdr = &tcp_ctask->hdr; | |
2164 | } | |
2165 | ||
2166 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
2167 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
2168 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
2169 | ||
2170 | mtask->hdr = &tcp_mtask->hdr; | |
2171 | } | |
2172 | ||
2173 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) | |
2174 | goto r2tpool_alloc_fail; | |
2175 | ||
2176 | return cls_session; | |
2177 | ||
2178 | r2tpool_alloc_fail: | |
2179 | iscsi_session_teardown(cls_session); | |
2180 | return NULL; | |
2181 | } | |
2182 | ||
2183 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
2184 | { | |
5bb0b55a MC |
2185 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
2186 | iscsi_session_teardown(cls_session); | |
7ba24713 AA |
2187 | } |
2188 | ||
d1d81c01 MC |
2189 | static int iscsi_tcp_slave_configure(struct scsi_device *sdev) |
2190 | { | |
2191 | blk_queue_dma_alignment(sdev->request_queue, 0); | |
2192 | return 0; | |
2193 | } | |
2194 | ||
5bb0b55a | 2195 | static struct scsi_host_template iscsi_sht = { |
f4246b33 | 2196 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
2197 | .queuecommand = iscsi_queuecommand, |
2198 | .change_queue_depth = iscsi_change_queue_depth, | |
1548271e | 2199 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
5bb0b55a | 2200 | .sg_tablesize = ISCSI_SG_TABLESIZE, |
8231f0ed | 2201 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
2202 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
2203 | .eh_abort_handler = iscsi_eh_abort, | |
2204 | .eh_host_reset_handler = iscsi_eh_host_reset, | |
2205 | .use_clustering = DISABLE_CLUSTERING, | |
d1d81c01 | 2206 | .slave_configure = iscsi_tcp_slave_configure, |
5bb0b55a MC |
2207 | .proc_name = "iscsi_tcp", |
2208 | .this_id = -1, | |
2209 | }; | |
2210 | ||
7ba24713 AA |
2211 | static struct iscsi_transport iscsi_tcp_transport = { |
2212 | .owner = THIS_MODULE, | |
2213 | .name = "tcp", | |
2214 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
2215 | | CAP_DATADGST, | |
fd7255f5 MC |
2216 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
2217 | ISCSI_MAX_XMIT_DLENGTH | | |
2218 | ISCSI_HDRDGST_EN | | |
2219 | ISCSI_DATADGST_EN | | |
2220 | ISCSI_INITIAL_R2T_EN | | |
2221 | ISCSI_MAX_R2T | | |
2222 | ISCSI_IMM_DATA_EN | | |
2223 | ISCSI_FIRST_BURST | | |
2224 | ISCSI_MAX_BURST | | |
2225 | ISCSI_PDU_INORDER_EN | | |
2226 | ISCSI_DATASEQ_INORDER_EN | | |
2227 | ISCSI_ERL | | |
2228 | ISCSI_CONN_PORT | | |
8d2860b3 | 2229 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
2230 | ISCSI_EXP_STATSN | |
2231 | ISCSI_PERSISTENT_PORT | | |
2232 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
2233 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
2234 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
2235 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN, | |
8ad5781a MC |
2236 | .host_param_mask = ISCSI_HOST_HWADDRESS | |
2237 | ISCSI_HOST_INITIATOR_NAME, | |
7ba24713 | 2238 | .host_template = &iscsi_sht, |
7b8631b5 | 2239 | .conndata_size = sizeof(struct iscsi_conn), |
7ba24713 AA |
2240 | .max_conn = 1, |
2241 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, | |
5bb0b55a MC |
2242 | /* session management */ |
2243 | .create_session = iscsi_tcp_session_create, | |
2244 | .destroy_session = iscsi_tcp_session_destroy, | |
2245 | /* connection management */ | |
2246 | .create_conn = iscsi_tcp_conn_create, | |
2247 | .bind_conn = iscsi_tcp_conn_bind, | |
2248 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 2249 | .set_param = iscsi_conn_set_param, |
5c75b7fc | 2250 | .get_conn_param = iscsi_tcp_conn_get_param, |
7b8631b5 | 2251 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 2252 | .start_conn = iscsi_conn_start, |
1c83469d | 2253 | .stop_conn = iscsi_tcp_conn_stop, |
0801c242 MC |
2254 | /* iscsi host params */ |
2255 | .get_host_param = iscsi_host_get_param, | |
2256 | .set_host_param = iscsi_host_set_param, | |
5bb0b55a | 2257 | /* IO */ |
7ba24713 AA |
2258 | .send_pdu = iscsi_conn_send_pdu, |
2259 | .get_stats = iscsi_conn_get_stats, | |
5bb0b55a MC |
2260 | .init_cmd_task = iscsi_tcp_cmd_init, |
2261 | .init_mgmt_task = iscsi_tcp_mgmt_init, | |
2262 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, | |
2263 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2264 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2265 | /* recovery */ | |
30a6c652 | 2266 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
2267 | }; |
2268 | ||
2269 | static int __init | |
2270 | iscsi_tcp_init(void) | |
2271 | { | |
7ba24713 | 2272 | if (iscsi_max_lun < 1) { |
be2df72e OG |
2273 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
2274 | iscsi_max_lun); | |
7ba24713 AA |
2275 | return -EINVAL; |
2276 | } | |
2277 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
2278 | ||
7b8631b5 | 2279 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
ffbfe925 | 2280 | return -ENODEV; |
7ba24713 | 2281 | |
7b8631b5 | 2282 | return 0; |
7ba24713 AA |
2283 | } |
2284 | ||
2285 | static void __exit | |
2286 | iscsi_tcp_exit(void) | |
2287 | { | |
2288 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
7ba24713 AA |
2289 | } |
2290 | ||
2291 | module_init(iscsi_tcp_init); | |
2292 | module_exit(iscsi_tcp_exit); |