Commit | Line | Data |
---|---|---|
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); |
1c138991 | 240 | if (tcp_ctask->data_offset + tcp_conn->in.datalen > scsi_bufflen(sc)) { |
857ae0bd MC |
241 | debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n", |
242 | __FUNCTION__, tcp_ctask->data_offset, | |
1c138991 | 243 | tcp_conn->in.datalen, scsi_bufflen(sc)); |
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 && | |
1c138991 FT |
253 | res_count <= scsi_bufflen(sc)) { |
254 | scsi_set_resid(sc, res_count); | |
7ba24713 AA |
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) { |
1c138991 | 260 | scsi_set_resid(sc, be32_to_cpu(rhdr->residual_count)); |
7ba24713 AA |
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 | 287 | struct scsi_cmnd *sc = ctask->sc; |
1c138991 FT |
288 | int i, sg_count = 0; |
289 | struct scatterlist *sg; | |
7ba24713 | 290 | |
ffbfe925 | 291 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
292 | memset(hdr, 0, sizeof(struct iscsi_data)); |
293 | hdr->ttt = r2t->ttt; | |
294 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
295 | r2t->solicit_datasn++; | |
296 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
297 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
298 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
299 | hdr->exp_statsn = r2t->exp_statsn; |
300 | hdr->offset = cpu_to_be32(r2t->data_offset); | |
301 | if (r2t->data_length > conn->max_xmit_dlength) { | |
302 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
303 | r2t->data_count = conn->max_xmit_dlength; | |
304 | hdr->flags = 0; | |
305 | } else { | |
306 | hton24(hdr->dlength, r2t->data_length); | |
307 | r2t->data_count = r2t->data_length; | |
308 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
309 | } | |
310 | conn->dataout_pdus_cnt++; | |
311 | ||
312 | r2t->sent = 0; | |
313 | ||
6e458cc9 | 314 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 315 | sizeof(struct iscsi_hdr)); |
7ba24713 | 316 | |
1c138991 FT |
317 | sg = scsi_sglist(sc); |
318 | r2t->sg = NULL; | |
319 | for (i = 0; i < scsi_sg_count(sc); i++, sg += 1) { | |
320 | /* FIXME: prefetch ? */ | |
321 | if (sg_count + sg->length > r2t->data_offset) { | |
322 | int page_offset; | |
7ba24713 | 323 | |
1c138991 | 324 | /* sg page found! */ |
7ba24713 | 325 | |
1c138991 FT |
326 | /* offset within this page */ |
327 | page_offset = r2t->data_offset - sg_count; | |
7ba24713 | 328 | |
1c138991 FT |
329 | /* fill in this buffer */ |
330 | iscsi_buf_init_sg(&r2t->sendbuf, sg); | |
331 | r2t->sendbuf.sg.offset += page_offset; | |
332 | r2t->sendbuf.sg.length -= page_offset; | |
7ba24713 | 333 | |
1c138991 FT |
334 | /* xmit logic will continue with next one */ |
335 | r2t->sg = sg + 1; | |
336 | break; | |
7ba24713 | 337 | } |
1c138991 | 338 | sg_count += sg->length; |
62f38300 | 339 | } |
1c138991 | 340 | BUG_ON(r2t->sg == NULL); |
7ba24713 AA |
341 | } |
342 | ||
343 | /** | |
344 | * iscsi_r2t_rsp - iSCSI R2T Response processing | |
345 | * @conn: iscsi connection | |
346 | * @ctask: scsi command task | |
347 | **/ | |
348 | static int | |
349 | iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
350 | { | |
351 | struct iscsi_r2t_info *r2t; | |
352 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
353 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
354 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
355 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
7ba24713 AA |
356 | int r2tsn = be32_to_cpu(rhdr->r2tsn); |
357 | int rc; | |
358 | ||
98a9416a MC |
359 | if (tcp_conn->in.datalen) { |
360 | printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n", | |
361 | tcp_conn->in.datalen); | |
7ba24713 | 362 | return ISCSI_ERR_DATALEN; |
98a9416a | 363 | } |
7ba24713 | 364 | |
d473cc7f MC |
365 | if (tcp_ctask->exp_datasn != r2tsn){ |
366 | debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n", | |
367 | __FUNCTION__, tcp_ctask->exp_datasn, r2tsn); | |
7ba24713 | 368 | return ISCSI_ERR_R2TSN; |
d473cc7f | 369 | } |
7ba24713 | 370 | |
7ba24713 AA |
371 | /* fill-in new R2T associated with the task */ |
372 | spin_lock(&session->lock); | |
77a23c21 MC |
373 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
374 | ||
7ba24713 AA |
375 | if (!ctask->sc || ctask->mtask || |
376 | session->state != ISCSI_STATE_LOGGED_IN) { | |
377 | printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " | |
378 | "recovery...\n", ctask->itt); | |
379 | spin_unlock(&session->lock); | |
380 | return 0; | |
381 | } | |
b6c395ed | 382 | |
5bb0b55a | 383 | rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 AA |
384 | BUG_ON(!rc); |
385 | ||
386 | r2t->exp_statsn = rhdr->statsn; | |
387 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
98a9416a MC |
388 | if (r2t->data_length == 0) { |
389 | printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n"); | |
7ba24713 AA |
390 | spin_unlock(&session->lock); |
391 | return ISCSI_ERR_DATALEN; | |
392 | } | |
393 | ||
98a9416a MC |
394 | if (r2t->data_length > session->max_burst) |
395 | debug_scsi("invalid R2T with data len %u and max burst %u." | |
396 | "Attempting to execute request.\n", | |
397 | r2t->data_length, session->max_burst); | |
398 | ||
7ba24713 | 399 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); |
1c138991 | 400 | if (r2t->data_offset + r2t->data_length > scsi_bufflen(ctask->sc)) { |
7ba24713 | 401 | spin_unlock(&session->lock); |
98a9416a MC |
402 | printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at " |
403 | "offset %u and total length %d\n", r2t->data_length, | |
1c138991 | 404 | r2t->data_offset, scsi_bufflen(ctask->sc)); |
7ba24713 AA |
405 | return ISCSI_ERR_DATALEN; |
406 | } | |
407 | ||
408 | r2t->ttt = rhdr->ttt; /* no flip */ | |
409 | r2t->solicit_datasn = 0; | |
410 | ||
411 | iscsi_solicit_data_init(conn, ctask, r2t); | |
412 | ||
d473cc7f | 413 | tcp_ctask->exp_datasn = r2tsn + 1; |
5bb0b55a | 414 | __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); |
218432c6 | 415 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR_INIT; |
b6c395ed | 416 | list_move_tail(&ctask->running, &conn->xmitqueue); |
7ba24713 | 417 | |
55e3299d | 418 | scsi_queue_work(session->host, &conn->xmitwork); |
7ba24713 AA |
419 | conn->r2t_pdus_cnt++; |
420 | spin_unlock(&session->lock); | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
425 | static int | |
5bb0b55a | 426 | iscsi_tcp_hdr_recv(struct iscsi_conn *conn) |
7ba24713 | 427 | { |
5bb0b55a | 428 | int rc = 0, opcode, ahslen; |
7ba24713 | 429 | struct iscsi_hdr *hdr; |
7ba24713 | 430 | struct iscsi_session *session = conn->session; |
5bb0b55a MC |
431 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
432 | uint32_t cdgst, rdgst = 0, itt; | |
7ba24713 | 433 | |
5bb0b55a | 434 | hdr = tcp_conn->in.hdr; |
7ba24713 AA |
435 | |
436 | /* verify PDU length */ | |
5bb0b55a MC |
437 | tcp_conn->in.datalen = ntoh24(hdr->dlength); |
438 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
7ba24713 | 439 | printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", |
5bb0b55a | 440 | tcp_conn->in.datalen, conn->max_recv_dlength); |
7ba24713 AA |
441 | return ISCSI_ERR_DATALEN; |
442 | } | |
5bb0b55a | 443 | tcp_conn->data_copied = 0; |
7ba24713 AA |
444 | |
445 | /* read AHS */ | |
5bb0b55a MC |
446 | ahslen = hdr->hlength << 2; |
447 | tcp_conn->in.offset += ahslen; | |
448 | tcp_conn->in.copy -= ahslen; | |
449 | if (tcp_conn->in.copy < 0) { | |
7ba24713 | 450 | printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " |
5bb0b55a | 451 | "%d bytes\n", ahslen); |
7ba24713 AA |
452 | return ISCSI_ERR_AHSLEN; |
453 | } | |
454 | ||
455 | /* calculate read padding */ | |
5bb0b55a MC |
456 | tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1); |
457 | if (tcp_conn->in.padding) { | |
458 | tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding; | |
459 | debug_scsi("read padding %d bytes\n", tcp_conn->in.padding); | |
7ba24713 AA |
460 | } |
461 | ||
462 | if (conn->hdrdgst_en) { | |
463 | struct scatterlist sg; | |
464 | ||
465 | sg_init_one(&sg, (u8 *)hdr, | |
5bb0b55a | 466 | sizeof(struct iscsi_hdr) + ahslen); |
c9802cd9 JB |
467 | crypto_hash_digest(&tcp_conn->rx_hash, &sg, sg.length, |
468 | (u8 *)&cdgst); | |
7ba24713 | 469 | rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + |
5bb0b55a | 470 | ahslen); |
8a47cd34 | 471 | if (cdgst != rdgst) { |
5bb0b55a MC |
472 | printk(KERN_ERR "iscsi_tcp: hdrdgst error " |
473 | "recv 0x%x calc 0x%x\n", rdgst, cdgst); | |
8a47cd34 MC |
474 | return ISCSI_ERR_HDR_DGST; |
475 | } | |
7ba24713 AA |
476 | } |
477 | ||
5bb0b55a | 478 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
7ba24713 | 479 | /* verify itt (itt encoding: age+cid+itt) */ |
5bb0b55a MC |
480 | rc = iscsi_verify_itt(conn, hdr, &itt); |
481 | if (rc == ISCSI_ERR_NO_SCSI_CMD) { | |
482 | tcp_conn->in.datalen = 0; /* force drop */ | |
483 | return 0; | |
484 | } else if (rc) | |
485 | return rc; | |
7ba24713 AA |
486 | |
487 | debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", | |
5bb0b55a MC |
488 | opcode, tcp_conn->in.offset, tcp_conn->in.copy, |
489 | ahslen, tcp_conn->in.datalen); | |
7ba24713 | 490 | |
5bb0b55a MC |
491 | switch(opcode) { |
492 | case ISCSI_OP_SCSI_DATA_IN: | |
493 | tcp_conn->in.ctask = session->cmds[itt]; | |
494 | rc = iscsi_data_rsp(conn, tcp_conn->in.ctask); | |
275fd7d1 MC |
495 | if (rc) |
496 | return rc; | |
5bb0b55a MC |
497 | /* fall through */ |
498 | case ISCSI_OP_SCSI_CMD_RSP: | |
499 | tcp_conn->in.ctask = session->cmds[itt]; | |
500 | if (tcp_conn->in.datalen) | |
501 | goto copy_hdr; | |
7ba24713 | 502 | |
5bb0b55a | 503 | spin_lock(&session->lock); |
5bb0b55a MC |
504 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); |
505 | spin_unlock(&session->lock); | |
506 | break; | |
507 | case ISCSI_OP_R2T: | |
508 | tcp_conn->in.ctask = session->cmds[itt]; | |
509 | if (ahslen) | |
510 | rc = ISCSI_ERR_AHSLEN; | |
511 | else if (tcp_conn->in.ctask->sc->sc_data_direction == | |
512 | DMA_TO_DEVICE) | |
513 | rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); | |
514 | else | |
515 | rc = ISCSI_ERR_PROTO; | |
516 | break; | |
517 | case ISCSI_OP_LOGIN_RSP: | |
518 | case ISCSI_OP_TEXT_RSP: | |
5bb0b55a MC |
519 | case ISCSI_OP_REJECT: |
520 | case ISCSI_OP_ASYNC_EVENT: | |
c8dc1e52 MC |
521 | /* |
522 | * It is possible that we could get a PDU with a buffer larger | |
523 | * than 8K, but there are no targets that currently do this. | |
524 | * For now we fail until we find a vendor that needs it | |
525 | */ | |
bf32ed33 | 526 | if (ISCSI_DEF_MAX_RECV_SEG_LEN < |
c8dc1e52 MC |
527 | tcp_conn->in.datalen) { |
528 | printk(KERN_ERR "iscsi_tcp: received buffer of len %u " | |
529 | "but conn buffer is only %u (opcode %0x)\n", | |
530 | tcp_conn->in.datalen, | |
bf32ed33 | 531 | ISCSI_DEF_MAX_RECV_SEG_LEN, opcode); |
c8dc1e52 MC |
532 | rc = ISCSI_ERR_PROTO; |
533 | break; | |
534 | } | |
535 | ||
5bb0b55a MC |
536 | if (tcp_conn->in.datalen) |
537 | goto copy_hdr; | |
538 | /* fall through */ | |
c8dc1e52 MC |
539 | case ISCSI_OP_LOGOUT_RSP: |
540 | case ISCSI_OP_NOOP_IN: | |
5bb0b55a MC |
541 | case ISCSI_OP_SCSI_TMFUNC_RSP: |
542 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
543 | break; | |
544 | default: | |
545 | rc = ISCSI_ERR_BAD_OPCODE; | |
546 | break; | |
547 | } | |
7ba24713 AA |
548 | |
549 | return rc; | |
5bb0b55a MC |
550 | |
551 | copy_hdr: | |
552 | /* | |
553 | * if we did zero copy for the header but we will need multiple | |
554 | * skbs to complete the command then we have to copy the header | |
555 | * for later use | |
556 | */ | |
275fd7d1 | 557 | if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <= |
5bb0b55a MC |
558 | (tcp_conn->in.datalen + tcp_conn->in.padding + |
559 | (conn->datadgst_en ? 4 : 0))) { | |
560 | debug_tcp("Copying header for later use. in.copy %d in.datalen" | |
561 | " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); | |
562 | memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, | |
563 | sizeof(struct iscsi_hdr)); | |
564 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
565 | tcp_conn->in.zero_copy_hdr = 0; | |
566 | } | |
567 | return 0; | |
7ba24713 AA |
568 | } |
569 | ||
570 | /** | |
571 | * iscsi_ctask_copy - copy skb bits to the destanation cmd task | |
5bb0b55a | 572 | * @conn: iscsi tcp connection |
7ba24713 AA |
573 | * @ctask: scsi command task |
574 | * @buf: buffer to copy to | |
575 | * @buf_size: size of buffer | |
576 | * @offset: offset within the buffer | |
577 | * | |
578 | * Notes: | |
579 | * The function calls skb_copy_bits() and updates per-connection and | |
580 | * per-cmd byte counters. | |
581 | * | |
582 | * Read counters (in bytes): | |
583 | * | |
584 | * conn->in.offset offset within in progress SKB | |
585 | * conn->in.copy left to copy from in progress SKB | |
586 | * including padding | |
587 | * conn->in.copied copied already from in progress SKB | |
588 | * conn->data_copied copied already from in progress buffer | |
589 | * ctask->sent total bytes sent up to the MidLayer | |
590 | * ctask->data_count left to copy from in progress Data-In | |
591 | * buf_left left to copy from in progress buffer | |
592 | **/ | |
593 | static inline int | |
5bb0b55a | 594 | iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, |
7ba24713 AA |
595 | void *buf, int buf_size, int offset) |
596 | { | |
5bb0b55a MC |
597 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
598 | int buf_left = buf_size - (tcp_conn->data_copied + offset); | |
857ae0bd | 599 | unsigned size = min(tcp_conn->in.copy, buf_left); |
7ba24713 AA |
600 | int rc; |
601 | ||
602 | size = min(size, ctask->data_count); | |
603 | ||
604 | debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 605 | size, tcp_conn->in.offset, tcp_conn->in.copied); |
7ba24713 AA |
606 | |
607 | BUG_ON(size <= 0); | |
1c138991 | 608 | BUG_ON(tcp_ctask->sent + size > scsi_bufflen(ctask->sc)); |
7ba24713 | 609 | |
5bb0b55a MC |
610 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
611 | (char*)buf + (offset + tcp_conn->data_copied), size); | |
7ba24713 AA |
612 | /* must fit into skb->len */ |
613 | BUG_ON(rc); | |
614 | ||
5bb0b55a MC |
615 | tcp_conn->in.offset += size; |
616 | tcp_conn->in.copy -= size; | |
617 | tcp_conn->in.copied += size; | |
618 | tcp_conn->data_copied += size; | |
619 | tcp_ctask->sent += size; | |
7ba24713 AA |
620 | ctask->data_count -= size; |
621 | ||
5bb0b55a | 622 | BUG_ON(tcp_conn->in.copy < 0); |
7ba24713 AA |
623 | BUG_ON(ctask->data_count < 0); |
624 | ||
5bb0b55a | 625 | if (buf_size != (tcp_conn->data_copied + offset)) { |
7ba24713 | 626 | if (!ctask->data_count) { |
5bb0b55a | 627 | BUG_ON(buf_size - tcp_conn->data_copied < 0); |
7ba24713 | 628 | /* done with this PDU */ |
5bb0b55a | 629 | return buf_size - tcp_conn->data_copied; |
7ba24713 AA |
630 | } |
631 | return -EAGAIN; | |
632 | } | |
633 | ||
634 | /* done with this buffer or with both - PDU and buffer */ | |
5bb0b55a | 635 | tcp_conn->data_copied = 0; |
7ba24713 AA |
636 | return 0; |
637 | } | |
638 | ||
639 | /** | |
640 | * iscsi_tcp_copy - copy skb bits to the destanation buffer | |
5bb0b55a | 641 | * @conn: iscsi tcp connection |
7ba24713 AA |
642 | * |
643 | * Notes: | |
644 | * The function calls skb_copy_bits() and updates per-connection | |
645 | * byte counters. | |
646 | **/ | |
647 | static inline int | |
ca518684 | 648 | iscsi_tcp_copy(struct iscsi_conn *conn, int buf_size) |
7ba24713 | 649 | { |
c8dc1e52 | 650 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5bb0b55a MC |
651 | int buf_left = buf_size - tcp_conn->data_copied; |
652 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
653 | int rc; |
654 | ||
655 | debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 656 | size, tcp_conn->in.offset, tcp_conn->data_copied); |
7ba24713 AA |
657 | BUG_ON(size <= 0); |
658 | ||
5bb0b55a | 659 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
c8dc1e52 | 660 | (char*)conn->data + tcp_conn->data_copied, size); |
7ba24713 AA |
661 | BUG_ON(rc); |
662 | ||
5bb0b55a MC |
663 | tcp_conn->in.offset += size; |
664 | tcp_conn->in.copy -= size; | |
665 | tcp_conn->in.copied += size; | |
666 | tcp_conn->data_copied += size; | |
7ba24713 | 667 | |
5bb0b55a | 668 | if (buf_size != tcp_conn->data_copied) |
7ba24713 AA |
669 | return -EAGAIN; |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | static inline void | |
c9802cd9 | 675 | partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg, |
62f38300 | 676 | int offset, int length) |
7ba24713 AA |
677 | { |
678 | struct scatterlist temp; | |
679 | ||
680 | memcpy(&temp, sg, sizeof(struct scatterlist)); | |
681 | temp.offset = offset; | |
682 | temp.length = length; | |
c9802cd9 | 683 | crypto_hash_update(desc, &temp, length); |
7ba24713 AA |
684 | } |
685 | ||
f6cfba1d | 686 | static void |
5bb0b55a | 687 | iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) |
f6cfba1d MC |
688 | { |
689 | struct scatterlist tmp; | |
690 | ||
691 | sg_init_one(&tmp, buf, len); | |
c9802cd9 | 692 | crypto_hash_update(&tcp_conn->rx_hash, &tmp, len); |
f6cfba1d MC |
693 | } |
694 | ||
7ba24713 AA |
695 | static int iscsi_scsi_data_in(struct iscsi_conn *conn) |
696 | { | |
5bb0b55a MC |
697 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
698 | struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; | |
699 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 700 | struct scsi_cmnd *sc = ctask->sc; |
f6cfba1d | 701 | struct scatterlist *sg; |
7ba24713 AA |
702 | int i, offset, rc = 0; |
703 | ||
704 | BUG_ON((void*)ctask != sc->SCp.ptr); | |
705 | ||
5bb0b55a | 706 | offset = tcp_ctask->data_offset; |
1c138991 | 707 | sg = scsi_sglist(sc); |
7ba24713 | 708 | |
5bb0b55a MC |
709 | if (tcp_ctask->data_offset) |
710 | for (i = 0; i < tcp_ctask->sg_count; i++) | |
7ba24713 AA |
711 | offset -= sg[i].length; |
712 | /* we've passed through partial sg*/ | |
713 | if (offset < 0) | |
714 | offset = 0; | |
715 | ||
1c138991 | 716 | for (i = tcp_ctask->sg_count; i < scsi_sg_count(sc); i++) { |
7ba24713 AA |
717 | char *dest; |
718 | ||
719 | dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); | |
5bb0b55a | 720 | rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, |
7ba24713 AA |
721 | sg[i].length, offset); |
722 | kunmap_atomic(dest, KM_SOFTIRQ0); | |
723 | if (rc == -EAGAIN) | |
724 | /* continue with the next SKB/PDU */ | |
725 | return rc; | |
726 | if (!rc) { | |
727 | if (conn->datadgst_en) { | |
728 | if (!offset) | |
dc64ddf4 | 729 | crypto_hash_update( |
c9802cd9 | 730 | &tcp_conn->rx_hash, |
c959e1c2 | 731 | &sg[i], sg[i].length); |
7ba24713 | 732 | else |
62f38300 | 733 | partial_sg_digest_update( |
c9802cd9 | 734 | &tcp_conn->rx_hash, |
5bb0b55a | 735 | &sg[i], |
7ba24713 AA |
736 | sg[i].offset + offset, |
737 | sg[i].length - offset); | |
738 | } | |
739 | offset = 0; | |
5bb0b55a | 740 | tcp_ctask->sg_count++; |
7ba24713 AA |
741 | } |
742 | ||
743 | if (!ctask->data_count) { | |
744 | if (rc && conn->datadgst_en) | |
745 | /* | |
746 | * data-in is complete, but buffer not... | |
747 | */ | |
c9802cd9 JB |
748 | partial_sg_digest_update(&tcp_conn->rx_hash, |
749 | &sg[i], | |
750 | sg[i].offset, | |
751 | sg[i].length-rc); | |
7ba24713 AA |
752 | rc = 0; |
753 | break; | |
754 | } | |
755 | ||
5bb0b55a | 756 | if (!tcp_conn->in.copy) |
7ba24713 AA |
757 | return -EAGAIN; |
758 | } | |
759 | BUG_ON(ctask->data_count); | |
760 | ||
7ba24713 | 761 | /* check for non-exceptional status */ |
5bb0b55a | 762 | if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { |
b6c395ed MC |
763 | debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n", |
764 | (long)sc, sc->result, ctask->itt, | |
765 | tcp_conn->in.hdr->flags); | |
5bb0b55a | 766 | spin_lock(&conn->session->lock); |
5bb0b55a MC |
767 | __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); |
768 | spin_unlock(&conn->session->lock); | |
7ba24713 AA |
769 | } |
770 | ||
771 | return rc; | |
772 | } | |
773 | ||
774 | static int | |
775 | iscsi_data_recv(struct iscsi_conn *conn) | |
776 | { | |
5bb0b55a MC |
777 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
778 | int rc = 0, opcode; | |
7ba24713 | 779 | |
5bb0b55a MC |
780 | opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
781 | switch (opcode) { | |
7ba24713 AA |
782 | case ISCSI_OP_SCSI_DATA_IN: |
783 | rc = iscsi_scsi_data_in(conn); | |
784 | break; | |
5bb0b55a | 785 | case ISCSI_OP_SCSI_CMD_RSP: |
7ba24713 AA |
786 | case ISCSI_OP_TEXT_RSP: |
787 | case ISCSI_OP_LOGIN_RSP: | |
5bb0b55a MC |
788 | case ISCSI_OP_ASYNC_EVENT: |
789 | case ISCSI_OP_REJECT: | |
7ba24713 AA |
790 | /* |
791 | * Collect data segment to the connection's data | |
792 | * placeholder | |
793 | */ | |
ca518684 | 794 | if (iscsi_tcp_copy(conn, tcp_conn->in.datalen)) { |
7ba24713 AA |
795 | rc = -EAGAIN; |
796 | goto exit; | |
797 | } | |
798 | ||
c8dc1e52 | 799 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data, |
5bb0b55a MC |
800 | tcp_conn->in.datalen); |
801 | if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) | |
c8dc1e52 | 802 | iscsi_recv_digest_update(tcp_conn, conn->data, |
5bb0b55a MC |
803 | tcp_conn->in.datalen); |
804 | break; | |
7ba24713 AA |
805 | default: |
806 | BUG_ON(1); | |
807 | } | |
808 | exit: | |
809 | return rc; | |
810 | } | |
811 | ||
812 | /** | |
813 | * iscsi_tcp_data_recv - TCP receive in sendfile fashion | |
814 | * @rd_desc: read descriptor | |
815 | * @skb: socket buffer | |
816 | * @offset: offset in skb | |
817 | * @len: skb->len - offset | |
818 | **/ | |
819 | static int | |
820 | iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
821 | unsigned int offset, size_t len) | |
822 | { | |
823 | int rc; | |
824 | struct iscsi_conn *conn = rd_desc->arg.data; | |
5bb0b55a | 825 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
826 | int processed; |
827 | char pad[ISCSI_PAD_LEN]; | |
828 | struct scatterlist sg; | |
829 | ||
830 | /* | |
831 | * Save current SKB and its offset in the corresponding | |
832 | * connection context. | |
833 | */ | |
5bb0b55a MC |
834 | tcp_conn->in.copy = skb->len - offset; |
835 | tcp_conn->in.offset = offset; | |
836 | tcp_conn->in.skb = skb; | |
837 | tcp_conn->in.len = tcp_conn->in.copy; | |
838 | BUG_ON(tcp_conn->in.copy <= 0); | |
839 | debug_tcp("in %d bytes\n", tcp_conn->in.copy); | |
7ba24713 AA |
840 | |
841 | more: | |
5bb0b55a | 842 | tcp_conn->in.copied = 0; |
7ba24713 AA |
843 | rc = 0; |
844 | ||
845 | if (unlikely(conn->suspend_rx)) { | |
846 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
847 | return 0; | |
848 | } | |
849 | ||
5bb0b55a MC |
850 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || |
851 | tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { | |
852 | rc = iscsi_hdr_extract(tcp_conn); | |
7ba24713 AA |
853 | if (rc) { |
854 | if (rc == -EAGAIN) | |
855 | goto nomore; | |
856 | else { | |
d82967c7 | 857 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
858 | return 0; |
859 | } | |
860 | } | |
861 | ||
862 | /* | |
863 | * Verify and process incoming PDU header. | |
864 | */ | |
5bb0b55a MC |
865 | rc = iscsi_tcp_hdr_recv(conn); |
866 | if (!rc && tcp_conn->in.datalen) { | |
dd8c0d95 | 867 | if (conn->datadgst_en) |
c9802cd9 | 868 | crypto_hash_init(&tcp_conn->rx_hash); |
5bb0b55a | 869 | tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; |
7ba24713 | 870 | } else if (rc) { |
40527afe | 871 | iscsi_conn_failure(conn, rc); |
7ba24713 AA |
872 | return 0; |
873 | } | |
874 | } | |
875 | ||
dbdb016d MC |
876 | if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV && |
877 | tcp_conn->in.copy) { | |
f6cfba1d | 878 | uint32_t recv_digest; |
5bb0b55a | 879 | |
7ba24713 | 880 | debug_tcp("extra data_recv offset %d copy %d\n", |
5bb0b55a | 881 | tcp_conn->in.offset, tcp_conn->in.copy); |
dbdb016d MC |
882 | |
883 | if (!tcp_conn->data_copied) { | |
884 | if (tcp_conn->in.padding) { | |
885 | debug_tcp("padding -> %d\n", | |
886 | tcp_conn->in.padding); | |
887 | memset(pad, 0, tcp_conn->in.padding); | |
888 | sg_init_one(&sg, pad, tcp_conn->in.padding); | |
889 | crypto_hash_update(&tcp_conn->rx_hash, | |
890 | &sg, sg.length); | |
891 | } | |
892 | crypto_hash_final(&tcp_conn->rx_hash, | |
893 | (u8 *) &tcp_conn->in.datadgst); | |
894 | debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); | |
895 | } | |
896 | ||
ca518684 MC |
897 | rc = iscsi_tcp_copy(conn, sizeof(uint32_t)); |
898 | if (rc) { | |
899 | if (rc == -EAGAIN) | |
900 | goto again; | |
901 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
902 | return 0; | |
903 | } | |
904 | ||
905 | memcpy(&recv_digest, conn->data, sizeof(uint32_t)); | |
5bb0b55a | 906 | if (recv_digest != tcp_conn->in.datadgst) { |
f6cfba1d MC |
907 | debug_tcp("iscsi_tcp: data digest error!" |
908 | "0x%x != 0x%x\n", recv_digest, | |
5bb0b55a | 909 | tcp_conn->in.datadgst); |
f6cfba1d MC |
910 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
911 | return 0; | |
912 | } else { | |
913 | debug_tcp("iscsi_tcp: data digest match!" | |
914 | "0x%x == 0x%x\n", recv_digest, | |
5bb0b55a MC |
915 | tcp_conn->in.datadgst); |
916 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
917 | } |
918 | } | |
919 | ||
5bb0b55a | 920 | if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && |
dbdb016d | 921 | tcp_conn->in.copy) { |
7ba24713 | 922 | debug_tcp("data_recv offset %d copy %d\n", |
5bb0b55a | 923 | tcp_conn->in.offset, tcp_conn->in.copy); |
7ba24713 AA |
924 | |
925 | rc = iscsi_data_recv(conn); | |
926 | if (rc) { | |
665b44ae | 927 | if (rc == -EAGAIN) |
7ba24713 | 928 | goto again; |
d82967c7 | 929 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
930 | return 0; |
931 | } | |
dbdb016d MC |
932 | |
933 | if (tcp_conn->in.padding) | |
934 | tcp_conn->in_progress = IN_PROGRESS_PAD_RECV; | |
935 | else if (conn->datadgst_en) | |
5bb0b55a | 936 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; |
dbdb016d MC |
937 | else |
938 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
939 | tcp_conn->data_copied = 0; | |
940 | } | |
941 | ||
942 | if (tcp_conn->in_progress == IN_PROGRESS_PAD_RECV && | |
943 | tcp_conn->in.copy) { | |
944 | int copylen = min(tcp_conn->in.padding - tcp_conn->data_copied, | |
945 | tcp_conn->in.copy); | |
946 | ||
947 | tcp_conn->in.copy -= copylen; | |
948 | tcp_conn->in.offset += copylen; | |
949 | tcp_conn->data_copied += copylen; | |
950 | ||
951 | if (tcp_conn->data_copied != tcp_conn->in.padding) | |
952 | tcp_conn->in_progress = IN_PROGRESS_PAD_RECV; | |
953 | else if (conn->datadgst_en) | |
954 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; | |
955 | else | |
5bb0b55a | 956 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
dbdb016d | 957 | tcp_conn->data_copied = 0; |
7ba24713 AA |
958 | } |
959 | ||
960 | debug_tcp("f, processed %d from out of %d padding %d\n", | |
5bb0b55a MC |
961 | tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); |
962 | BUG_ON(tcp_conn->in.offset - offset > len); | |
7ba24713 | 963 | |
5bb0b55a | 964 | if (tcp_conn->in.offset - offset != len) { |
7ba24713 | 965 | debug_tcp("continue to process %d bytes\n", |
5bb0b55a | 966 | (int)len - (tcp_conn->in.offset - offset)); |
7ba24713 AA |
967 | goto more; |
968 | } | |
969 | ||
970 | nomore: | |
5bb0b55a | 971 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
972 | BUG_ON(processed == 0); |
973 | return processed; | |
974 | ||
975 | again: | |
5bb0b55a | 976 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
977 | debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", |
978 | processed, (int)len, (int)rd_desc->count); | |
979 | BUG_ON(processed == 0); | |
980 | BUG_ON(processed > len); | |
981 | ||
982 | conn->rxdata_octets += processed; | |
983 | return processed; | |
984 | } | |
985 | ||
986 | static void | |
987 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
988 | { | |
989 | struct iscsi_conn *conn = sk->sk_user_data; | |
990 | read_descriptor_t rd_desc; | |
991 | ||
992 | read_lock(&sk->sk_callback_lock); | |
993 | ||
665b44ae MC |
994 | /* |
995 | * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv. | |
996 | * We set count to 1 because we want the network layer to | |
997 | * hand us all the skbs that are available. iscsi_tcp_data_recv | |
998 | * handled pdus that cross buffers or pdus that still need data. | |
999 | */ | |
7ba24713 | 1000 | rd_desc.arg.data = conn; |
665b44ae | 1001 | rd_desc.count = 1; |
7ba24713 AA |
1002 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); |
1003 | ||
1004 | read_unlock(&sk->sk_callback_lock); | |
1005 | } | |
1006 | ||
1007 | static void | |
1008 | iscsi_tcp_state_change(struct sock *sk) | |
1009 | { | |
5bb0b55a | 1010 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
1011 | struct iscsi_conn *conn; |
1012 | struct iscsi_session *session; | |
1013 | void (*old_state_change)(struct sock *); | |
1014 | ||
1015 | read_lock(&sk->sk_callback_lock); | |
1016 | ||
1017 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
1018 | session = conn->session; | |
1019 | ||
e6273993 MC |
1020 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
1021 | sk->sk_state == TCP_CLOSE) && | |
1022 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
1023 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
1024 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1025 | } | |
1026 | ||
5bb0b55a MC |
1027 | tcp_conn = conn->dd_data; |
1028 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
1029 | |
1030 | read_unlock(&sk->sk_callback_lock); | |
1031 | ||
1032 | old_state_change(sk); | |
1033 | } | |
1034 | ||
1035 | /** | |
1036 | * iscsi_write_space - Called when more output buffer space is available | |
1037 | * @sk: socket space is available for | |
1038 | **/ | |
1039 | static void | |
1040 | iscsi_write_space(struct sock *sk) | |
1041 | { | |
1042 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1043 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1044 | ||
1045 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1046 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
55e3299d | 1047 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1048 | } |
1049 | ||
1050 | static void | |
1051 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1052 | { | |
5bb0b55a MC |
1053 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1054 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1055 | |
1056 | /* assign new callbacks */ | |
1057 | write_lock_bh(&sk->sk_callback_lock); | |
1058 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1059 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1060 | tcp_conn->old_state_change = sk->sk_state_change; | |
1061 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1062 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1063 | sk->sk_state_change = iscsi_tcp_state_change; | |
1064 | sk->sk_write_space = iscsi_write_space; | |
1065 | write_unlock_bh(&sk->sk_callback_lock); | |
1066 | } | |
1067 | ||
1068 | static void | |
1c83469d | 1069 | iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 1070 | { |
5bb0b55a | 1071 | struct sock *sk = tcp_conn->sock->sk; |
7ba24713 AA |
1072 | |
1073 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1074 | write_lock_bh(&sk->sk_callback_lock); | |
1075 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1076 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1077 | sk->sk_state_change = tcp_conn->old_state_change; | |
1078 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1079 | sk->sk_no_check = 0; |
1080 | write_unlock_bh(&sk->sk_callback_lock); | |
1081 | } | |
1082 | ||
1083 | /** | |
1084 | * iscsi_send - generic send routine | |
1085 | * @sk: kernel's socket | |
1086 | * @buf: buffer to write from | |
1087 | * @size: actual size to write | |
1088 | * @flags: socket's flags | |
7ba24713 AA |
1089 | */ |
1090 | static inline int | |
56851698 | 1091 | iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
7ba24713 | 1092 | { |
5bb0b55a MC |
1093 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1094 | struct socket *sk = tcp_conn->sock; | |
3219e529 | 1095 | int offset = buf->sg.offset + buf->sent, res; |
7ba24713 | 1096 | |
7cae5159 MC |
1097 | /* |
1098 | * if we got use_sg=0 or are sending something we kmallocd | |
1099 | * then we did not have to do kmap (kmap returns page_address) | |
1100 | * | |
1101 | * if we got use_sg > 0, but had to drop down, we do not | |
1102 | * set clustering so this should only happen for that | |
1103 | * slab case. | |
1104 | */ | |
1105 | if (buf->use_sendmsg) | |
3219e529 | 1106 | res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags); |
7cae5159 | 1107 | else |
3219e529 MC |
1108 | res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags); |
1109 | ||
1110 | if (res >= 0) { | |
1111 | conn->txdata_octets += res; | |
1112 | buf->sent += res; | |
1113 | return res; | |
1114 | } | |
1115 | ||
1116 | tcp_conn->sendpage_failures_cnt++; | |
1117 | if (res == -EAGAIN) | |
1118 | res = -ENOBUFS; | |
1119 | else | |
1120 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1121 | return res; | |
7ba24713 AA |
1122 | } |
1123 | ||
1124 | /** | |
1125 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() | |
1126 | * @conn: iscsi connection | |
1127 | * @buf: buffer to write from | |
1128 | * @datalen: lenght of data to be sent after the header | |
1129 | * | |
1130 | * Notes: | |
1131 | * (Tx, Fast Path) | |
1132 | **/ | |
1133 | static inline int | |
1134 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) | |
1135 | { | |
7ba24713 AA |
1136 | int flags = 0; /* MSG_DONTWAIT; */ |
1137 | int res, size; | |
1138 | ||
1139 | size = buf->sg.length - buf->sent; | |
1140 | BUG_ON(buf->sent + size > buf->sg.length); | |
1141 | if (buf->sent + size != buf->sg.length || datalen) | |
1142 | flags |= MSG_MORE; | |
1143 | ||
56851698 | 1144 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1145 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
1146 | if (res >= 0) { | |
7ba24713 AA |
1147 | if (size != res) |
1148 | return -EAGAIN; | |
1149 | return 0; | |
3219e529 | 1150 | } |
7ba24713 AA |
1151 | |
1152 | return res; | |
1153 | } | |
1154 | ||
1155 | /** | |
1156 | * iscsi_sendpage - send one page of iSCSI Data-Out. | |
1157 | * @conn: iscsi connection | |
1158 | * @buf: buffer to write from | |
1159 | * @count: remaining data | |
1160 | * @sent: number of bytes sent | |
1161 | * | |
1162 | * Notes: | |
1163 | * (Tx, Fast Path) | |
1164 | **/ | |
1165 | static inline int | |
1166 | iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, | |
1167 | int *count, int *sent) | |
1168 | { | |
7ba24713 AA |
1169 | int flags = 0; /* MSG_DONTWAIT; */ |
1170 | int res, size; | |
1171 | ||
1172 | size = buf->sg.length - buf->sent; | |
1173 | BUG_ON(buf->sent + size > buf->sg.length); | |
1174 | if (size > *count) | |
1175 | size = *count; | |
b13941f6 | 1176 | if (buf->sent + size != buf->sg.length || *count != size) |
7ba24713 AA |
1177 | flags |= MSG_MORE; |
1178 | ||
56851698 | 1179 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1180 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
1181 | size, buf->sent, *count, *sent, res); | |
1182 | if (res >= 0) { | |
7ba24713 AA |
1183 | *count -= res; |
1184 | *sent += res; | |
1185 | if (size != res) | |
1186 | return -EAGAIN; | |
1187 | return 0; | |
3219e529 | 1188 | } |
7ba24713 AA |
1189 | |
1190 | return res; | |
1191 | } | |
1192 | ||
1193 | static inline void | |
5bb0b55a | 1194 | iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
62f38300 | 1195 | struct iscsi_tcp_cmd_task *tcp_ctask) |
7ba24713 | 1196 | { |
c9802cd9 | 1197 | crypto_hash_init(&tcp_conn->tx_hash); |
5bb0b55a | 1198 | tcp_ctask->digest_count = 4; |
7ba24713 AA |
1199 | } |
1200 | ||
7ba24713 AA |
1201 | /** |
1202 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1203 | * @conn: iscsi connection | |
1204 | * @ctask: scsi command task | |
1205 | * @r2t: R2T info | |
1206 | * @left: bytes left to transfer | |
1207 | * | |
1208 | * Notes: | |
1209 | * Initialize next Data-Out within this R2T sequence and continue | |
1210 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1211 | * | |
1212 | * Called under connection lock. | |
1213 | **/ | |
1214 | static void | |
1215 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1216 | struct iscsi_r2t_info *r2t, int left) | |
1217 | { | |
1218 | struct iscsi_data *hdr; | |
7ba24713 AA |
1219 | int new_offset; |
1220 | ||
ffbfe925 | 1221 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
1222 | memset(hdr, 0, sizeof(struct iscsi_data)); |
1223 | hdr->ttt = r2t->ttt; | |
1224 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1225 | r2t->solicit_datasn++; | |
1226 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
1227 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
1228 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
1229 | hdr->exp_statsn = r2t->exp_statsn; |
1230 | new_offset = r2t->data_offset + r2t->sent; | |
1231 | hdr->offset = cpu_to_be32(new_offset); | |
1232 | if (left > conn->max_xmit_dlength) { | |
1233 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1234 | r2t->data_count = conn->max_xmit_dlength; | |
1235 | } else { | |
1236 | hton24(hdr->dlength, left); | |
1237 | r2t->data_count = left; | |
1238 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1239 | } | |
1240 | conn->dataout_pdus_cnt++; | |
1241 | ||
6e458cc9 | 1242 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 1243 | sizeof(struct iscsi_hdr)); |
7ba24713 | 1244 | |
62f38300 MC |
1245 | if (iscsi_buf_left(&r2t->sendbuf)) |
1246 | return; | |
1247 | ||
1c138991 FT |
1248 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1249 | r2t->sg += 1; | |
7ba24713 AA |
1250 | } |
1251 | ||
62f38300 MC |
1252 | static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask, |
1253 | unsigned long len) | |
7ba24713 | 1254 | { |
62f38300 MC |
1255 | tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1); |
1256 | if (!tcp_ctask->pad_count) | |
1257 | return; | |
7ba24713 | 1258 | |
62f38300 MC |
1259 | tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count; |
1260 | debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count); | |
1261 | tcp_ctask->xmstate |= XMSTATE_W_PAD; | |
7ba24713 AA |
1262 | } |
1263 | ||
1264 | /** | |
5bb0b55a | 1265 | * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 AA |
1266 | * @conn: iscsi connection |
1267 | * @ctask: scsi command task | |
1268 | * @sc: scsi command | |
1269 | **/ | |
1270 | static void | |
5bb0b55a | 1271 | iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
7ba24713 | 1272 | { |
5bb0b55a | 1273 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1274 | |
5bb0b55a | 1275 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
218432c6 | 1276 | tcp_ctask->xmstate = XMSTATE_CMD_HDR_INIT; |
7ba24713 AA |
1277 | } |
1278 | ||
1279 | /** | |
5bb0b55a | 1280 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
7ba24713 AA |
1281 | * @conn: iscsi connection |
1282 | * @mtask: task management task | |
1283 | * | |
1284 | * Notes: | |
1285 | * The function can return -EAGAIN in which case caller must | |
1286 | * call it again later, or recover. '0' return code means successful | |
1287 | * xmit. | |
1288 | * | |
218432c6 MC |
1289 | * Management xmit state machine consists of these states: |
1290 | * XMSTATE_IMM_HDR_INIT - calculate digest of PDU Header | |
1291 | * XMSTATE_IMM_HDR - PDU Header xmit in progress | |
1292 | * XMSTATE_IMM_DATA - PDU Data xmit in progress | |
1293 | * XMSTATE_IDLE - management PDU is done | |
7ba24713 AA |
1294 | **/ |
1295 | static int | |
5bb0b55a | 1296 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1297 | { |
5bb0b55a | 1298 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
3219e529 | 1299 | int rc; |
7ba24713 AA |
1300 | |
1301 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", | |
5bb0b55a | 1302 | conn->id, tcp_mtask->xmstate, mtask->itt); |
7ba24713 | 1303 | |
218432c6 MC |
1304 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR_INIT) { |
1305 | iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr, | |
1306 | sizeof(struct iscsi_hdr)); | |
1307 | ||
1308 | if (mtask->data_count) { | |
5bb0b55a | 1309 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
218432c6 MC |
1310 | iscsi_buf_init_iov(&tcp_mtask->sendbuf, |
1311 | (char*)mtask->data, | |
1312 | mtask->data_count); | |
1313 | } | |
1314 | ||
af973481 | 1315 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
30a6c652 | 1316 | conn->stop_stage != STOP_CONN_RECOVER && |
af973481 | 1317 | conn->hdrdgst_en) |
5bb0b55a MC |
1318 | iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
1319 | (u8*)tcp_mtask->hdrext); | |
218432c6 MC |
1320 | |
1321 | tcp_mtask->sent = 0; | |
1322 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR_INIT; | |
1323 | tcp_mtask->xmstate |= XMSTATE_IMM_HDR; | |
1324 | } | |
1325 | ||
1326 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { | |
3219e529 MC |
1327 | rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf, |
1328 | mtask->data_count); | |
218432c6 | 1329 | if (rc) |
3219e529 | 1330 | return rc; |
218432c6 | 1331 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; |
7ba24713 AA |
1332 | } |
1333 | ||
5bb0b55a | 1334 | if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 | 1335 | BUG_ON(!mtask->data_count); |
5bb0b55a | 1336 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1337 | /* FIXME: implement. |
1338 | * Virtual buffer could be spreaded across multiple pages... | |
1339 | */ | |
1340 | do { | |
3219e529 MC |
1341 | int rc; |
1342 | ||
1343 | rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf, | |
1344 | &mtask->data_count, &tcp_mtask->sent); | |
1345 | if (rc) { | |
5bb0b55a | 1346 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
3219e529 | 1347 | return rc; |
7ba24713 AA |
1348 | } |
1349 | } while (mtask->data_count); | |
1350 | } | |
1351 | ||
5bb0b55a | 1352 | BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
b4377356 | 1353 | if (mtask->hdr->itt == RESERVED_ITT) { |
5bb0b55a MC |
1354 | struct iscsi_session *session = conn->session; |
1355 | ||
1356 | spin_lock_bh(&session->lock); | |
1357 | list_del(&conn->mtask->running); | |
1358 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, | |
1359 | sizeof(void*)); | |
1360 | spin_unlock_bh(&session->lock); | |
1361 | } | |
7ba24713 AA |
1362 | return 0; |
1363 | } | |
1364 | ||
218432c6 MC |
1365 | static int |
1366 | iscsi_send_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1367 | { |
218432c6 MC |
1368 | struct scsi_cmnd *sc = ctask->sc; |
1369 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1370 | int rc = 0; | |
3219e529 | 1371 | |
218432c6 MC |
1372 | if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_INIT) { |
1373 | tcp_ctask->sent = 0; | |
1374 | tcp_ctask->sg_count = 0; | |
1375 | tcp_ctask->exp_datasn = 0; | |
1376 | ||
1377 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
1c138991 FT |
1378 | struct scatterlist *sg = scsi_sglist(sc); |
1379 | ||
1380 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg); | |
1381 | tcp_ctask->sg = sg + 1; | |
1382 | tcp_ctask->bad_sg = sg + scsi_sg_count(sc); | |
7ba24713 | 1383 | |
218432c6 MC |
1384 | debug_scsi("cmd [itt 0x%x total %d imm_data %d " |
1385 | "unsol count %d, unsol offset %d]\n", | |
1c138991 | 1386 | ctask->itt, scsi_bufflen(sc), |
218432c6 MC |
1387 | ctask->imm_count, ctask->unsol_count, |
1388 | ctask->unsol_offset); | |
1389 | } | |
5bb0b55a | 1390 | |
218432c6 MC |
1391 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, |
1392 | sizeof(struct iscsi_hdr)); | |
1393 | ||
1394 | if (conn->hdrdgst_en) | |
1395 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, | |
1396 | (u8*)tcp_ctask->hdrext); | |
1397 | tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_INIT; | |
1398 | tcp_ctask->xmstate |= XMSTATE_CMD_HDR_XMIT; | |
62f38300 MC |
1399 | } |
1400 | ||
218432c6 MC |
1401 | if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_XMIT) { |
1402 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count); | |
1403 | if (rc) | |
1404 | return rc; | |
1405 | tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_XMIT; | |
1406 | ||
1407 | if (sc->sc_data_direction != DMA_TO_DEVICE) | |
1408 | return 0; | |
1409 | ||
1410 | if (ctask->imm_count) { | |
1411 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; | |
1412 | iscsi_set_padding(tcp_ctask, ctask->imm_count); | |
62f38300 | 1413 | |
218432c6 MC |
1414 | if (ctask->conn->datadgst_en) { |
1415 | iscsi_data_digest_init(ctask->conn->dd_data, | |
1416 | tcp_ctask); | |
1417 | tcp_ctask->immdigest = 0; | |
1418 | } | |
62f38300 | 1419 | } |
62f38300 | 1420 | |
218432c6 MC |
1421 | if (ctask->unsol_count) |
1422 | tcp_ctask->xmstate |= | |
1423 | XMSTATE_UNS_HDR | XMSTATE_UNS_INIT; | |
1424 | } | |
1425 | return rc; | |
7ba24713 AA |
1426 | } |
1427 | ||
62f38300 MC |
1428 | static int |
1429 | iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1430 | { |
5bb0b55a | 1431 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
62f38300 MC |
1432 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1433 | int sent = 0, rc; | |
5bb0b55a | 1434 | |
62f38300 MC |
1435 | if (tcp_ctask->xmstate & XMSTATE_W_PAD) { |
1436 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, | |
1437 | tcp_ctask->pad_count); | |
1438 | if (conn->datadgst_en) | |
c9802cd9 JB |
1439 | crypto_hash_update(&tcp_conn->tx_hash, |
1440 | &tcp_ctask->sendbuf.sg, | |
1441 | tcp_ctask->sendbuf.sg.length); | |
62f38300 MC |
1442 | } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD)) |
1443 | return 0; | |
1444 | ||
1445 | tcp_ctask->xmstate &= ~XMSTATE_W_PAD; | |
1446 | tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD; | |
1447 | debug_scsi("sending %d pad bytes for itt 0x%x\n", | |
1448 | tcp_ctask->pad_count, ctask->itt); | |
1449 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, | |
1450 | &sent); | |
3219e529 | 1451 | if (rc) { |
62f38300 MC |
1452 | debug_scsi("padding send failed %d\n", rc); |
1453 | tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD; | |
7ba24713 | 1454 | } |
3219e529 | 1455 | return rc; |
7ba24713 AA |
1456 | } |
1457 | ||
62f38300 MC |
1458 | static int |
1459 | iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1460 | struct iscsi_buf *buf, uint32_t *digest) | |
7ba24713 | 1461 | { |
62f38300 MC |
1462 | struct iscsi_tcp_cmd_task *tcp_ctask; |
1463 | struct iscsi_tcp_conn *tcp_conn; | |
1464 | int rc, sent = 0; | |
5bb0b55a | 1465 | |
62f38300 MC |
1466 | if (!conn->datadgst_en) |
1467 | return 0; | |
7ba24713 | 1468 | |
62f38300 MC |
1469 | tcp_ctask = ctask->dd_data; |
1470 | tcp_conn = conn->dd_data; | |
7ba24713 | 1471 | |
62f38300 | 1472 | if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) { |
c9802cd9 | 1473 | crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest); |
62f38300 MC |
1474 | iscsi_buf_init_iov(buf, (char*)digest, 4); |
1475 | } | |
1476 | tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST; | |
7ba24713 | 1477 | |
62f38300 MC |
1478 | rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
1479 | if (!rc) | |
1480 | debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest, | |
1481 | ctask->itt); | |
1482 | else { | |
1483 | debug_scsi("sending digest 0x%x failed for itt 0x%x!\n", | |
1484 | *digest, ctask->itt); | |
1485 | tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST; | |
7ba24713 | 1486 | } |
62f38300 MC |
1487 | return rc; |
1488 | } | |
7ba24713 | 1489 | |
62f38300 MC |
1490 | static int |
1491 | iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf, | |
1492 | struct scatterlist **sg, int *sent, int *count, | |
1493 | struct iscsi_buf *digestbuf, uint32_t *digest) | |
1494 | { | |
1495 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1496 | struct iscsi_conn *conn = ctask->conn; | |
1497 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1498 | int rc, buf_sent, offset; | |
1499 | ||
1500 | while (*count) { | |
1501 | buf_sent = 0; | |
1502 | offset = sendbuf->sent; | |
1503 | ||
1504 | rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent); | |
1505 | *sent = *sent + buf_sent; | |
1506 | if (buf_sent && conn->datadgst_en) | |
c9802cd9 | 1507 | partial_sg_digest_update(&tcp_conn->tx_hash, |
62f38300 MC |
1508 | &sendbuf->sg, sendbuf->sg.offset + offset, |
1509 | buf_sent); | |
1510 | if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) { | |
1511 | iscsi_buf_init_sg(sendbuf, *sg); | |
1512 | *sg = *sg + 1; | |
7ba24713 | 1513 | } |
62f38300 MC |
1514 | |
1515 | if (rc) | |
1516 | return rc; | |
7ba24713 AA |
1517 | } |
1518 | ||
62f38300 MC |
1519 | rc = iscsi_send_padding(conn, ctask); |
1520 | if (rc) | |
1521 | return rc; | |
1522 | ||
1523 | return iscsi_send_digest(conn, ctask, digestbuf, digest); | |
7ba24713 AA |
1524 | } |
1525 | ||
62f38300 MC |
1526 | static int |
1527 | iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1528 | { |
5bb0b55a | 1529 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1530 | struct iscsi_data_task *dtask; |
3219e529 | 1531 | int rc; |
7ba24713 | 1532 | |
5bb0b55a MC |
1533 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
1534 | if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { | |
62f38300 MC |
1535 | dtask = &tcp_ctask->unsol_dtask; |
1536 | ||
ffd0436e MC |
1537 | iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr); |
1538 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, | |
1539 | sizeof(struct iscsi_hdr)); | |
af973481 | 1540 | if (conn->hdrdgst_en) |
5bb0b55a | 1541 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
af973481 | 1542 | (u8*)dtask->hdrext); |
62f38300 | 1543 | |
5bb0b55a | 1544 | tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
62f38300 | 1545 | iscsi_set_padding(tcp_ctask, ctask->data_count); |
7ba24713 | 1546 | } |
3219e529 MC |
1547 | |
1548 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count); | |
1549 | if (rc) { | |
5bb0b55a MC |
1550 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
1551 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR; | |
3219e529 | 1552 | return rc; |
7ba24713 AA |
1553 | } |
1554 | ||
dd8c0d95 MC |
1555 | if (conn->datadgst_en) { |
1556 | dtask = &tcp_ctask->unsol_dtask; | |
1557 | iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask); | |
1558 | dtask->digest = 0; | |
1559 | } | |
1560 | ||
7ba24713 | 1561 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", |
5bb0b55a | 1562 | ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
7ba24713 AA |
1563 | return 0; |
1564 | } | |
1565 | ||
62f38300 MC |
1566 | static int |
1567 | iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 1568 | { |
5bb0b55a | 1569 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1570 | int rc; |
7ba24713 | 1571 | |
62f38300 MC |
1572 | if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
1573 | BUG_ON(!ctask->unsol_count); | |
1574 | tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; | |
1575 | send_hdr: | |
1576 | rc = iscsi_send_unsol_hdr(conn, ctask); | |
1577 | if (rc) | |
1578 | return rc; | |
7ba24713 AA |
1579 | } |
1580 | ||
62f38300 MC |
1581 | if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
1582 | struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask; | |
5bb0b55a | 1583 | int start = tcp_ctask->sent; |
7ba24713 | 1584 | |
62f38300 MC |
1585 | rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg, |
1586 | &tcp_ctask->sent, &ctask->data_count, | |
1587 | &dtask->digestbuf, &dtask->digest); | |
5bb0b55a | 1588 | ctask->unsol_count -= tcp_ctask->sent - start; |
62f38300 MC |
1589 | if (rc) |
1590 | return rc; | |
1591 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; | |
7ba24713 | 1592 | /* |
62f38300 MC |
1593 | * Done with the Data-Out. Next, check if we need |
1594 | * to send another unsolicited Data-Out. | |
7ba24713 | 1595 | */ |
62f38300 MC |
1596 | if (ctask->unsol_count) { |
1597 | debug_scsi("sending more uns\n"); | |
1598 | tcp_ctask->xmstate |= XMSTATE_UNS_INIT; | |
1599 | goto send_hdr; | |
7ba24713 | 1600 | } |
7ba24713 | 1601 | } |
7ba24713 AA |
1602 | return 0; |
1603 | } | |
1604 | ||
62f38300 MC |
1605 | static int iscsi_send_sol_pdu(struct iscsi_conn *conn, |
1606 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1607 | { |
5bb0b55a | 1608 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
62f38300 MC |
1609 | struct iscsi_session *session = conn->session; |
1610 | struct iscsi_r2t_info *r2t; | |
1611 | struct iscsi_data_task *dtask; | |
3219e529 | 1612 | int left, rc; |
7ba24713 | 1613 | |
218432c6 | 1614 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR_INIT) { |
db37c505 MC |
1615 | if (!tcp_ctask->r2t) { |
1616 | spin_lock_bh(&session->lock); | |
62f38300 MC |
1617 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, |
1618 | sizeof(void*)); | |
db37c505 MC |
1619 | spin_unlock_bh(&session->lock); |
1620 | } | |
62f38300 MC |
1621 | send_hdr: |
1622 | r2t = tcp_ctask->r2t; | |
1623 | dtask = &r2t->dtask; | |
7ba24713 | 1624 | |
62f38300 MC |
1625 | if (conn->hdrdgst_en) |
1626 | iscsi_hdr_digest(conn, &r2t->headbuf, | |
1627 | (u8*)dtask->hdrext); | |
218432c6 MC |
1628 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR_INIT; |
1629 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
1630 | } | |
1631 | ||
1632 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { | |
1633 | r2t = tcp_ctask->r2t; | |
1634 | dtask = &r2t->dtask; | |
1635 | ||
62f38300 | 1636 | rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count); |
218432c6 | 1637 | if (rc) |
3219e529 | 1638 | return rc; |
218432c6 MC |
1639 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
1640 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
7ba24713 | 1641 | |
7ba24713 | 1642 | if (conn->datadgst_en) { |
dd8c0d95 MC |
1643 | iscsi_data_digest_init(conn->dd_data, tcp_ctask); |
1644 | dtask->digest = 0; | |
7ba24713 | 1645 | } |
7ba24713 | 1646 | |
62f38300 MC |
1647 | iscsi_set_padding(tcp_ctask, r2t->data_count); |
1648 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", | |
1649 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, | |
1650 | r2t->sent); | |
7ba24713 AA |
1651 | } |
1652 | ||
62f38300 MC |
1653 | if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
1654 | r2t = tcp_ctask->r2t; | |
1655 | dtask = &r2t->dtask; | |
7ba24713 | 1656 | |
62f38300 MC |
1657 | rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg, |
1658 | &r2t->sent, &r2t->data_count, | |
1659 | &dtask->digestbuf, &dtask->digest); | |
1660 | if (rc) | |
1661 | return rc; | |
1662 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; | |
7ba24713 | 1663 | |
62f38300 MC |
1664 | /* |
1665 | * Done with this Data-Out. Next, check if we have | |
1666 | * to send another Data-Out for this R2T. | |
1667 | */ | |
1668 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1669 | left = r2t->data_length - r2t->sent; | |
1670 | if (left) { | |
1671 | iscsi_solicit_data_cont(conn, ctask, r2t, left); | |
62f38300 MC |
1672 | goto send_hdr; |
1673 | } | |
7ba24713 | 1674 | |
62f38300 MC |
1675 | /* |
1676 | * Done with this R2T. Check if there are more | |
1677 | * outstanding R2Ts ready to be processed. | |
1678 | */ | |
1679 | spin_lock_bh(&session->lock); | |
1680 | tcp_ctask->r2t = NULL; | |
1681 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
1682 | sizeof(void*)); | |
1683 | if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, | |
1684 | sizeof(void*))) { | |
1685 | tcp_ctask->r2t = r2t; | |
62f38300 MC |
1686 | spin_unlock_bh(&session->lock); |
1687 | goto send_hdr; | |
7ba24713 | 1688 | } |
62f38300 | 1689 | spin_unlock_bh(&session->lock); |
7ba24713 | 1690 | } |
7ba24713 AA |
1691 | return 0; |
1692 | } | |
1693 | ||
218432c6 MC |
1694 | /** |
1695 | * iscsi_tcp_ctask_xmit - xmit normal PDU task | |
1696 | * @conn: iscsi connection | |
1697 | * @ctask: iscsi command task | |
1698 | * | |
1699 | * Notes: | |
1700 | * The function can return -EAGAIN in which case caller must | |
1701 | * call it again later, or recover. '0' return code means successful | |
1702 | * xmit. | |
1703 | * The function is devided to logical helpers (above) for the different | |
1704 | * xmit stages. | |
1705 | * | |
1706 | *iscsi_send_cmd_hdr() | |
1707 | * XMSTATE_CMD_HDR_INIT - prepare Header and Data buffers Calculate | |
1708 | * Header Digest | |
1709 | * XMSTATE_CMD_HDR_XMIT - Transmit header in progress | |
1710 | * | |
1711 | *iscsi_send_padding | |
1712 | * XMSTATE_W_PAD - Prepare and send pading | |
1713 | * XMSTATE_W_RESEND_PAD - retry send pading | |
1714 | * | |
1715 | *iscsi_send_digest | |
1716 | * XMSTATE_W_RESEND_DATA_DIGEST - Finalize and send Data Digest | |
1717 | * XMSTATE_W_RESEND_DATA_DIGEST - retry sending digest | |
1718 | * | |
1719 | *iscsi_send_unsol_hdr | |
1720 | * XMSTATE_UNS_INIT - prepare un-solicit data header and digest | |
1721 | * XMSTATE_UNS_HDR - send un-solicit header | |
1722 | * | |
1723 | *iscsi_send_unsol_pdu | |
1724 | * XMSTATE_UNS_DATA - send un-solicit data in progress | |
1725 | * | |
1726 | *iscsi_send_sol_pdu | |
1727 | * XMSTATE_SOL_HDR_INIT - solicit data header and digest initialize | |
1728 | * XMSTATE_SOL_HDR - send solicit header | |
1729 | * XMSTATE_SOL_DATA - send solicit data | |
1730 | * | |
1731 | *iscsi_tcp_ctask_xmit | |
1732 | * XMSTATE_IMM_DATA - xmit managment data (??) | |
1733 | **/ | |
7ba24713 | 1734 | static int |
5bb0b55a | 1735 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 1736 | { |
5bb0b55a | 1737 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1738 | int rc = 0; |
1739 | ||
1740 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", | |
5bb0b55a | 1741 | conn->id, tcp_ctask->xmstate, ctask->itt); |
7ba24713 | 1742 | |
218432c6 MC |
1743 | rc = iscsi_send_cmd_hdr(conn, ctask); |
1744 | if (rc) | |
1745 | return rc; | |
1746 | if (ctask->sc->sc_data_direction != DMA_TO_DEVICE) | |
1747 | return 0; | |
7ba24713 | 1748 | |
5bb0b55a | 1749 | if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
62f38300 MC |
1750 | rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg, |
1751 | &tcp_ctask->sent, &ctask->imm_count, | |
1752 | &tcp_ctask->immbuf, &tcp_ctask->immdigest); | |
7ba24713 AA |
1753 | if (rc) |
1754 | return rc; | |
62f38300 | 1755 | tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1756 | } |
1757 | ||
62f38300 MC |
1758 | rc = iscsi_send_unsol_pdu(conn, ctask); |
1759 | if (rc) | |
1760 | return rc; | |
7ba24713 | 1761 | |
62f38300 MC |
1762 | rc = iscsi_send_sol_pdu(conn, ctask); |
1763 | if (rc) | |
1764 | return rc; | |
7ba24713 AA |
1765 | |
1766 | return rc; | |
1767 | } | |
1768 | ||
5bb0b55a MC |
1769 | static struct iscsi_cls_conn * |
1770 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1771 | { |
5bb0b55a MC |
1772 | struct iscsi_conn *conn; |
1773 | struct iscsi_cls_conn *cls_conn; | |
1774 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1775 | |
5bb0b55a MC |
1776 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
1777 | if (!cls_conn) | |
1778 | return NULL; | |
1779 | conn = cls_conn->dd_data; | |
7ba24713 | 1780 | /* |
5bb0b55a MC |
1781 | * due to strange issues with iser these are not set |
1782 | * in iscsi_conn_setup | |
7ba24713 | 1783 | */ |
bf32ed33 | 1784 | conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN; |
7ba24713 | 1785 | |
5bb0b55a MC |
1786 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
1787 | if (!tcp_conn) | |
1788 | goto tcp_conn_alloc_fail; | |
7ba24713 | 1789 | |
5bb0b55a MC |
1790 | conn->dd_data = tcp_conn; |
1791 | tcp_conn->iscsi_conn = conn; | |
1792 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
1793 | /* initial operational parameters */ | |
1794 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); | |
7ba24713 | 1795 | |
c9802cd9 JB |
1796 | tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1797 | CRYPTO_ALG_ASYNC); | |
1798 | tcp_conn->tx_hash.flags = 0; | |
0f238418 MC |
1799 | if (IS_ERR(tcp_conn->tx_hash.tfm)) { |
1800 | printk(KERN_ERR "Could not create connection due to crc32c " | |
1801 | "loading error %ld. Make sure the crc32c module is " | |
1802 | "built as a module or into the kernel\n", | |
1803 | PTR_ERR(tcp_conn->tx_hash.tfm)); | |
dd8c0d95 | 1804 | goto free_tcp_conn; |
0f238418 | 1805 | } |
dd8c0d95 | 1806 | |
c9802cd9 JB |
1807 | tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
1808 | CRYPTO_ALG_ASYNC); | |
1809 | tcp_conn->rx_hash.flags = 0; | |
0f238418 MC |
1810 | if (IS_ERR(tcp_conn->rx_hash.tfm)) { |
1811 | printk(KERN_ERR "Could not create connection due to crc32c " | |
1812 | "loading error %ld. Make sure the crc32c module is " | |
1813 | "built as a module or into the kernel\n", | |
1814 | PTR_ERR(tcp_conn->rx_hash.tfm)); | |
dd8c0d95 | 1815 | goto free_tx_tfm; |
0f238418 | 1816 | } |
dd8c0d95 | 1817 | |
5bb0b55a | 1818 | return cls_conn; |
7ba24713 | 1819 | |
dd8c0d95 | 1820 | free_tx_tfm: |
c9802cd9 | 1821 | crypto_free_hash(tcp_conn->tx_hash.tfm); |
dd8c0d95 MC |
1822 | free_tcp_conn: |
1823 | kfree(tcp_conn); | |
5bb0b55a MC |
1824 | tcp_conn_alloc_fail: |
1825 | iscsi_conn_teardown(cls_conn); | |
1826 | return NULL; | |
7ba24713 AA |
1827 | } |
1828 | ||
1c83469d MC |
1829 | static void |
1830 | iscsi_tcp_release_conn(struct iscsi_conn *conn) | |
1831 | { | |
22236961 | 1832 | struct iscsi_session *session = conn->session; |
1c83469d | 1833 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
22236961 | 1834 | struct socket *sock = tcp_conn->sock; |
1c83469d | 1835 | |
22236961 | 1836 | if (!sock) |
1c83469d MC |
1837 | return; |
1838 | ||
22236961 | 1839 | sock_hold(sock->sk); |
1c83469d | 1840 | iscsi_conn_restore_callbacks(tcp_conn); |
22236961 | 1841 | sock_put(sock->sk); |
1c83469d | 1842 | |
22236961 | 1843 | spin_lock_bh(&session->lock); |
1c83469d MC |
1844 | tcp_conn->sock = NULL; |
1845 | conn->recv_lock = NULL; | |
22236961 MC |
1846 | spin_unlock_bh(&session->lock); |
1847 | sockfd_put(sock); | |
1c83469d MC |
1848 | } |
1849 | ||
7ba24713 | 1850 | static void |
5bb0b55a | 1851 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1852 | { |
5bb0b55a MC |
1853 | struct iscsi_conn *conn = cls_conn->dd_data; |
1854 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 | 1855 | |
1c83469d | 1856 | iscsi_tcp_release_conn(conn); |
5bb0b55a | 1857 | iscsi_conn_teardown(cls_conn); |
7ba24713 | 1858 | |
534284a0 PW |
1859 | if (tcp_conn->tx_hash.tfm) |
1860 | crypto_free_hash(tcp_conn->tx_hash.tfm); | |
1861 | if (tcp_conn->rx_hash.tfm) | |
1862 | crypto_free_hash(tcp_conn->rx_hash.tfm); | |
7ba24713 | 1863 | |
5bb0b55a MC |
1864 | kfree(tcp_conn); |
1865 | } | |
7ba24713 | 1866 | |
1c83469d MC |
1867 | static void |
1868 | iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1869 | { | |
1870 | struct iscsi_conn *conn = cls_conn->dd_data; | |
d5390f5f | 1871 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1c83469d MC |
1872 | |
1873 | iscsi_conn_stop(cls_conn, flag); | |
1874 | iscsi_tcp_release_conn(conn); | |
d5390f5f | 1875 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
1c83469d MC |
1876 | } |
1877 | ||
22236961 MC |
1878 | static int iscsi_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock, |
1879 | char *buf, int *port, | |
1880 | int (*getname)(struct socket *, struct sockaddr *, | |
1881 | int *addrlen)) | |
1882 | { | |
1883 | struct sockaddr_storage *addr; | |
1884 | struct sockaddr_in6 *sin6; | |
1885 | struct sockaddr_in *sin; | |
1886 | int rc = 0, len; | |
1887 | ||
1888 | addr = kmalloc(GFP_KERNEL, sizeof(*addr)); | |
1889 | if (!addr) | |
1890 | return -ENOMEM; | |
1891 | ||
1892 | if (getname(sock, (struct sockaddr *) addr, &len)) { | |
1893 | rc = -ENODEV; | |
1894 | goto free_addr; | |
1895 | } | |
1896 | ||
1897 | switch (addr->ss_family) { | |
1898 | case AF_INET: | |
1899 | sin = (struct sockaddr_in *)addr; | |
1900 | spin_lock_bh(&conn->session->lock); | |
1901 | sprintf(buf, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr)); | |
1902 | *port = be16_to_cpu(sin->sin_port); | |
1903 | spin_unlock_bh(&conn->session->lock); | |
1904 | break; | |
1905 | case AF_INET6: | |
1906 | sin6 = (struct sockaddr_in6 *)addr; | |
1907 | spin_lock_bh(&conn->session->lock); | |
1908 | sprintf(buf, NIP6_FMT, NIP6(sin6->sin6_addr)); | |
1909 | *port = be16_to_cpu(sin6->sin6_port); | |
1910 | spin_unlock_bh(&conn->session->lock); | |
1911 | break; | |
1912 | } | |
1913 | free_addr: | |
1914 | kfree(addr); | |
1915 | return rc; | |
1916 | } | |
1917 | ||
5bb0b55a MC |
1918 | static int |
1919 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1920 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1921 | int is_leading) |
1922 | { | |
1923 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1924 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1925 | struct sock *sk; | |
1926 | struct socket *sock; | |
1927 | int err; | |
7ba24713 | 1928 | |
5bb0b55a | 1929 | /* lookup for existing socket */ |
264faaaa | 1930 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a MC |
1931 | if (!sock) { |
1932 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); | |
1933 | return -EEXIST; | |
7ba24713 | 1934 | } |
22236961 MC |
1935 | /* |
1936 | * copy these values now because if we drop the session | |
1937 | * userspace may still want to query the values since we will | |
1938 | * be using them for the reconnect | |
1939 | */ | |
1940 | err = iscsi_tcp_get_addr(conn, sock, conn->portal_address, | |
1941 | &conn->portal_port, kernel_getpeername); | |
1942 | if (err) | |
1943 | goto free_socket; | |
1944 | ||
1945 | err = iscsi_tcp_get_addr(conn, sock, conn->local_address, | |
1946 | &conn->local_port, kernel_getsockname); | |
1947 | if (err) | |
1948 | goto free_socket; | |
7ba24713 | 1949 | |
5bb0b55a MC |
1950 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
1951 | if (err) | |
22236961 | 1952 | goto free_socket; |
7ba24713 | 1953 | |
67a61114 MC |
1954 | /* bind iSCSI connection and socket */ |
1955 | tcp_conn->sock = sock; | |
7ba24713 | 1956 | |
67a61114 MC |
1957 | /* setup Socket parameters */ |
1958 | sk = sock->sk; | |
1959 | sk->sk_reuse = 1; | |
1960 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
1961 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 1962 | |
67a61114 | 1963 | /* FIXME: disable Nagle's algorithm */ |
7ba24713 | 1964 | |
67a61114 MC |
1965 | /* |
1966 | * Intercept TCP callbacks for sendfile like receive | |
1967 | * processing. | |
1968 | */ | |
1969 | conn->recv_lock = &sk->sk_callback_lock; | |
1970 | iscsi_conn_set_callbacks(conn); | |
1971 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; | |
1972 | /* | |
1973 | * set receive state machine into initial state | |
1974 | */ | |
1975 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 | 1976 | return 0; |
22236961 MC |
1977 | |
1978 | free_socket: | |
1979 | sockfd_put(sock); | |
1980 | return err; | |
7ba24713 AA |
1981 | } |
1982 | ||
5bb0b55a | 1983 | /* called with host lock */ |
30a6c652 | 1984 | static void |
77a23c21 | 1985 | iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1986 | { |
5bb0b55a | 1987 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
218432c6 | 1988 | tcp_mtask->xmstate = XMSTATE_IMM_HDR_INIT; |
7ba24713 AA |
1989 | } |
1990 | ||
1991 | static int | |
1992 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
1993 | { | |
1994 | int i; | |
1995 | int cmd_i; | |
1996 | ||
1997 | /* | |
1998 | * initialize per-task: R2T pool and xmit queue | |
1999 | */ | |
2000 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2001 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
5bb0b55a | 2002 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
2003 | |
2004 | /* | |
2005 | * pre-allocated x4 as much r2ts to handle race when | |
2006 | * target acks DataOut faster than we data_xmit() queues | |
2007 | * could replenish r2tqueue. | |
2008 | */ | |
2009 | ||
2010 | /* R2T pool */ | |
5bb0b55a MC |
2011 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
2012 | (void***)&tcp_ctask->r2ts, | |
2013 | sizeof(struct iscsi_r2t_info))) { | |
7ba24713 AA |
2014 | goto r2t_alloc_fail; |
2015 | } | |
2016 | ||
2017 | /* R2T xmit queue */ | |
5bb0b55a | 2018 | tcp_ctask->r2tqueue = kfifo_alloc( |
7ba24713 | 2019 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
5bb0b55a MC |
2020 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
2021 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2022 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2023 | goto r2t_alloc_fail; |
2024 | } | |
7ba24713 AA |
2025 | } |
2026 | ||
2027 | return 0; | |
2028 | ||
2029 | r2t_alloc_fail: | |
2030 | for (i = 0; i < cmd_i; i++) { | |
5bb0b55a MC |
2031 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2032 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2033 | ||
5bb0b55a MC |
2034 | kfifo_free(tcp_ctask->r2tqueue); |
2035 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2036 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2037 | } |
2038 | return -ENOMEM; | |
2039 | } | |
2040 | ||
2041 | static void | |
2042 | iscsi_r2tpool_free(struct iscsi_session *session) | |
2043 | { | |
2044 | int i; | |
2045 | ||
2046 | for (i = 0; i < session->cmds_max; i++) { | |
5bb0b55a MC |
2047 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2048 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 2049 | |
5bb0b55a MC |
2050 | kfifo_free(tcp_ctask->r2tqueue); |
2051 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2052 | (void**)tcp_ctask->r2ts); | |
7ba24713 | 2053 | } |
7ba24713 AA |
2054 | } |
2055 | ||
2056 | static int | |
7b7232f3 | 2057 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
5c75b7fc | 2058 | char *buf, int buflen) |
7ba24713 | 2059 | { |
7b7232f3 | 2060 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 2061 | struct iscsi_session *session = conn->session; |
5bb0b55a | 2062 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5c75b7fc | 2063 | int value; |
7ba24713 | 2064 | |
7ba24713 | 2065 | switch(param) { |
7ba24713 | 2066 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 2067 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a | 2068 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
dd8c0d95 | 2069 | if (conn->hdrdgst_en) |
5bb0b55a | 2070 | tcp_conn->hdr_size += sizeof(__u32); |
7ba24713 AA |
2071 | break; |
2072 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 2073 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a MC |
2074 | tcp_conn->sendpage = conn->datadgst_en ? |
2075 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 | 2076 | break; |
7ba24713 | 2077 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 2078 | sscanf(buf, "%d", &value); |
7ba24713 AA |
2079 | if (session->max_r2t == roundup_pow_of_two(value)) |
2080 | break; | |
2081 | iscsi_r2tpool_free(session); | |
5c75b7fc | 2082 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2083 | if (session->max_r2t & (session->max_r2t - 1)) |
2084 | session->max_r2t = roundup_pow_of_two(session->max_r2t); | |
2085 | if (iscsi_r2tpool_alloc(session)) | |
2086 | return -ENOMEM; | |
2087 | break; | |
7ba24713 | 2088 | default: |
5c75b7fc | 2089 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2090 | } |
2091 | ||
2092 | return 0; | |
2093 | } | |
2094 | ||
2095 | static int | |
5c75b7fc MC |
2096 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
2097 | enum iscsi_param param, char *buf) | |
7b8631b5 | 2098 | { |
7b7232f3 | 2099 | struct iscsi_conn *conn = cls_conn->dd_data; |
5c75b7fc | 2100 | int len; |
7b8631b5 MC |
2101 | |
2102 | switch(param) { | |
fd7255f5 | 2103 | case ISCSI_PARAM_CONN_PORT: |
22236961 MC |
2104 | spin_lock_bh(&conn->session->lock); |
2105 | len = sprintf(buf, "%hu\n", conn->portal_port); | |
2106 | spin_unlock_bh(&conn->session->lock); | |
8d2860b3 | 2107 | break; |
fd7255f5 | 2108 | case ISCSI_PARAM_CONN_ADDRESS: |
22236961 MC |
2109 | spin_lock_bh(&conn->session->lock); |
2110 | len = sprintf(buf, "%s\n", conn->portal_address); | |
2111 | spin_unlock_bh(&conn->session->lock); | |
fd7255f5 MC |
2112 | break; |
2113 | default: | |
5c75b7fc | 2114 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
2115 | } |
2116 | ||
2117 | return len; | |
2118 | } | |
2119 | ||
22236961 MC |
2120 | static int |
2121 | iscsi_tcp_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2122 | char *buf) | |
2123 | { | |
2124 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2125 | int len; | |
2126 | ||
2127 | switch (param) { | |
2128 | case ISCSI_HOST_PARAM_IPADDRESS: | |
2129 | spin_lock_bh(&session->lock); | |
2130 | if (!session->leadconn) | |
2131 | len = -ENODEV; | |
2132 | else | |
2133 | len = sprintf(buf, "%s\n", | |
2134 | session->leadconn->local_address); | |
2135 | spin_unlock_bh(&session->lock); | |
2136 | break; | |
2137 | default: | |
2138 | return iscsi_host_get_param(shost, param, buf); | |
2139 | } | |
2140 | return len; | |
2141 | } | |
2142 | ||
7ba24713 | 2143 | static void |
7b7232f3 | 2144 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 2145 | { |
7b7232f3 | 2146 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2147 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
2148 | |
2149 | stats->txdata_octets = conn->txdata_octets; | |
2150 | stats->rxdata_octets = conn->rxdata_octets; | |
2151 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
2152 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
2153 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
2154 | stats->datain_pdus = conn->datain_pdus_cnt; | |
2155 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
2156 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
2157 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
2158 | stats->custom_length = 3; | |
2159 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 2160 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 2161 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 2162 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
2163 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
2164 | stats->custom[2].value = conn->eh_abort_cnt; | |
2165 | } | |
2166 | ||
5bb0b55a MC |
2167 | static struct iscsi_cls_session * |
2168 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, | |
2169 | struct scsi_transport_template *scsit, | |
1548271e | 2170 | uint16_t cmds_max, uint16_t qdepth, |
5bb0b55a | 2171 | uint32_t initial_cmdsn, uint32_t *hostno) |
7ba24713 | 2172 | { |
5bb0b55a MC |
2173 | struct iscsi_cls_session *cls_session; |
2174 | struct iscsi_session *session; | |
2175 | uint32_t hn; | |
2176 | int cmd_i; | |
7ba24713 | 2177 | |
1548271e | 2178 | cls_session = iscsi_session_setup(iscsit, scsit, cmds_max, qdepth, |
5bb0b55a MC |
2179 | sizeof(struct iscsi_tcp_cmd_task), |
2180 | sizeof(struct iscsi_tcp_mgmt_task), | |
2181 | initial_cmdsn, &hn); | |
2182 | if (!cls_session) | |
2183 | return NULL; | |
2184 | *hostno = hn; | |
7ba24713 | 2185 | |
5bb0b55a MC |
2186 | session = class_to_transport_session(cls_session); |
2187 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2188 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
2189 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2190 | ||
2191 | ctask->hdr = &tcp_ctask->hdr; | |
2192 | } | |
2193 | ||
2194 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
2195 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
2196 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
2197 | ||
2198 | mtask->hdr = &tcp_mtask->hdr; | |
2199 | } | |
2200 | ||
2201 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) | |
2202 | goto r2tpool_alloc_fail; | |
2203 | ||
2204 | return cls_session; | |
2205 | ||
2206 | r2tpool_alloc_fail: | |
2207 | iscsi_session_teardown(cls_session); | |
2208 | return NULL; | |
2209 | } | |
2210 | ||
2211 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
2212 | { | |
5bb0b55a MC |
2213 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
2214 | iscsi_session_teardown(cls_session); | |
7ba24713 AA |
2215 | } |
2216 | ||
d1d81c01 MC |
2217 | static int iscsi_tcp_slave_configure(struct scsi_device *sdev) |
2218 | { | |
2219 | blk_queue_dma_alignment(sdev->request_queue, 0); | |
2220 | return 0; | |
2221 | } | |
2222 | ||
5bb0b55a | 2223 | static struct scsi_host_template iscsi_sht = { |
f4246b33 | 2224 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
2225 | .queuecommand = iscsi_queuecommand, |
2226 | .change_queue_depth = iscsi_change_queue_depth, | |
1548271e | 2227 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
5bb0b55a | 2228 | .sg_tablesize = ISCSI_SG_TABLESIZE, |
8231f0ed | 2229 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
2230 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
2231 | .eh_abort_handler = iscsi_eh_abort, | |
2232 | .eh_host_reset_handler = iscsi_eh_host_reset, | |
2233 | .use_clustering = DISABLE_CLUSTERING, | |
d1d81c01 | 2234 | .slave_configure = iscsi_tcp_slave_configure, |
5bb0b55a MC |
2235 | .proc_name = "iscsi_tcp", |
2236 | .this_id = -1, | |
2237 | }; | |
2238 | ||
7ba24713 AA |
2239 | static struct iscsi_transport iscsi_tcp_transport = { |
2240 | .owner = THIS_MODULE, | |
2241 | .name = "tcp", | |
2242 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
2243 | | CAP_DATADGST, | |
fd7255f5 MC |
2244 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
2245 | ISCSI_MAX_XMIT_DLENGTH | | |
2246 | ISCSI_HDRDGST_EN | | |
2247 | ISCSI_DATADGST_EN | | |
2248 | ISCSI_INITIAL_R2T_EN | | |
2249 | ISCSI_MAX_R2T | | |
2250 | ISCSI_IMM_DATA_EN | | |
2251 | ISCSI_FIRST_BURST | | |
2252 | ISCSI_MAX_BURST | | |
2253 | ISCSI_PDU_INORDER_EN | | |
2254 | ISCSI_DATASEQ_INORDER_EN | | |
2255 | ISCSI_ERL | | |
2256 | ISCSI_CONN_PORT | | |
8d2860b3 | 2257 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
2258 | ISCSI_EXP_STATSN | |
2259 | ISCSI_PERSISTENT_PORT | | |
2260 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
2261 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
2262 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
2263 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN, | |
22236961 | 2264 | .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS | |
d8196ed2 MC |
2265 | ISCSI_HOST_INITIATOR_NAME | |
2266 | ISCSI_HOST_NETDEV_NAME, | |
7ba24713 | 2267 | .host_template = &iscsi_sht, |
7b8631b5 | 2268 | .conndata_size = sizeof(struct iscsi_conn), |
7ba24713 AA |
2269 | .max_conn = 1, |
2270 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, | |
5bb0b55a MC |
2271 | /* session management */ |
2272 | .create_session = iscsi_tcp_session_create, | |
2273 | .destroy_session = iscsi_tcp_session_destroy, | |
2274 | /* connection management */ | |
2275 | .create_conn = iscsi_tcp_conn_create, | |
2276 | .bind_conn = iscsi_tcp_conn_bind, | |
2277 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 2278 | .set_param = iscsi_conn_set_param, |
5c75b7fc | 2279 | .get_conn_param = iscsi_tcp_conn_get_param, |
7b8631b5 | 2280 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 2281 | .start_conn = iscsi_conn_start, |
1c83469d | 2282 | .stop_conn = iscsi_tcp_conn_stop, |
0801c242 | 2283 | /* iscsi host params */ |
22236961 | 2284 | .get_host_param = iscsi_tcp_host_get_param, |
0801c242 | 2285 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 2286 | /* IO */ |
7ba24713 AA |
2287 | .send_pdu = iscsi_conn_send_pdu, |
2288 | .get_stats = iscsi_conn_get_stats, | |
5bb0b55a MC |
2289 | .init_cmd_task = iscsi_tcp_cmd_init, |
2290 | .init_mgmt_task = iscsi_tcp_mgmt_init, | |
2291 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, | |
2292 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2293 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2294 | /* recovery */ | |
30a6c652 | 2295 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
2296 | }; |
2297 | ||
2298 | static int __init | |
2299 | iscsi_tcp_init(void) | |
2300 | { | |
7ba24713 | 2301 | if (iscsi_max_lun < 1) { |
be2df72e OG |
2302 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
2303 | iscsi_max_lun); | |
7ba24713 AA |
2304 | return -EINVAL; |
2305 | } | |
2306 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
2307 | ||
7b8631b5 | 2308 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
ffbfe925 | 2309 | return -ENODEV; |
7ba24713 | 2310 | |
7b8631b5 | 2311 | return 0; |
7ba24713 AA |
2312 | } |
2313 | ||
2314 | static void __exit | |
2315 | iscsi_tcp_exit(void) | |
2316 | { | |
2317 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
7ba24713 AA |
2318 | } |
2319 | ||
2320 | module_init(iscsi_tcp_init); | |
2321 | module_exit(iscsi_tcp_exit); |