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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 | |
6 | * Copyright (C) 2005 Mike Christie | |
7 | * maintained by open-iscsi@googlegroups.com | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published | |
11 | * by the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * See the file COPYING included with this distribution for more details. | |
20 | * | |
21 | * Credits: | |
22 | * Christoph Hellwig | |
23 | * FUJITA Tomonori | |
24 | * Arne Redlich | |
25 | * Zhenyu Wang | |
26 | */ | |
27 | ||
28 | #include <linux/types.h> | |
29 | #include <linux/list.h> | |
30 | #include <linux/inet.h> | |
31 | #include <linux/blkdev.h> | |
32 | #include <linux/crypto.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/kfifo.h> | |
35 | #include <linux/scatterlist.h> | |
36 | #include <net/tcp.h> | |
37 | #include <scsi/scsi_cmnd.h> | |
38 | #include <scsi/scsi_device.h> | |
39 | #include <scsi/scsi_eh.h> | |
40 | #include <scsi/scsi_request.h> | |
41 | #include <scsi/scsi_tcq.h> | |
42 | #include <scsi/scsi_host.h> | |
43 | #include <scsi/scsi.h> | |
44 | #include <scsi/scsi_transport_iscsi.h> | |
45 | ||
46 | #include "iscsi_tcp.h" | |
47 | ||
48 | MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
49 | "Alex Aizman <itn780@yahoo.com>"); | |
50 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
51 | MODULE_LICENSE("GPL"); | |
beb8abd9 | 52 | MODULE_VERSION("0:4.409"); |
7ba24713 AA |
53 | /* #define DEBUG_TCP */ |
54 | /* #define DEBUG_SCSI */ | |
55 | #define DEBUG_ASSERT | |
56 | ||
57 | #ifdef DEBUG_TCP | |
58 | #define debug_tcp(fmt...) printk(KERN_DEBUG "tcp: " fmt) | |
59 | #else | |
60 | #define debug_tcp(fmt...) | |
61 | #endif | |
62 | ||
63 | #ifdef DEBUG_SCSI | |
64 | #define debug_scsi(fmt...) printk(KERN_DEBUG "scsi: " fmt) | |
65 | #else | |
66 | #define debug_scsi(fmt...) | |
67 | #endif | |
68 | ||
69 | #ifndef DEBUG_ASSERT | |
70 | #ifdef BUG_ON | |
71 | #undef BUG_ON | |
72 | #endif | |
73 | #define BUG_ON(expr) | |
74 | #endif | |
75 | ||
76 | #define INVALID_SN_DELTA 0xffff | |
77 | ||
78 | static unsigned int iscsi_max_lun = 512; | |
79 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
80 | ||
81 | /* global data */ | |
82 | static kmem_cache_t *taskcache; | |
83 | ||
84 | static inline void | |
85 | iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size) | |
86 | { | |
87 | sg_init_one(&ibuf->sg, (u8 *)vbuf, size); | |
88 | ibuf->sent = 0; | |
89 | } | |
90 | ||
91 | static inline void | |
92 | iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size) | |
93 | { | |
94 | ibuf->sg.page = (void*)vbuf; | |
95 | ibuf->sg.offset = (unsigned int)-1; | |
96 | ibuf->sg.length = size; | |
97 | ibuf->sent = 0; | |
98 | } | |
99 | ||
100 | static inline void* | |
101 | iscsi_buf_iov_base(struct iscsi_buf *ibuf) | |
102 | { | |
103 | return (char*)ibuf->sg.page + ibuf->sent; | |
104 | } | |
105 | ||
106 | static inline void | |
107 | iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg) | |
108 | { | |
109 | /* | |
110 | * Fastpath: sg element fits into single page | |
111 | */ | |
112 | if (sg->length + sg->offset <= PAGE_SIZE && page_count(sg->page) >= 2) { | |
113 | ibuf->sg.page = sg->page; | |
114 | ibuf->sg.offset = sg->offset; | |
115 | ibuf->sg.length = sg->length; | |
116 | } else | |
117 | iscsi_buf_init_iov(ibuf, page_address(sg->page), sg->length); | |
118 | ibuf->sent = 0; | |
119 | } | |
120 | ||
121 | static inline int | |
122 | iscsi_buf_left(struct iscsi_buf *ibuf) | |
123 | { | |
124 | int rc; | |
125 | ||
126 | rc = ibuf->sg.length - ibuf->sent; | |
127 | BUG_ON(rc < 0); | |
128 | return rc; | |
129 | } | |
130 | ||
131 | static inline void | |
af973481 MC |
132 | iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, |
133 | u8* crc) | |
7ba24713 | 134 | { |
af973481 MC |
135 | crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc); |
136 | buf->sg.length += sizeof(uint32_t); | |
7ba24713 AA |
137 | } |
138 | ||
139 | static void | |
140 | iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
141 | { | |
142 | struct iscsi_session *session = conn->session; | |
143 | unsigned long flags; | |
144 | ||
145 | spin_lock_irqsave(&session->lock, flags); | |
146 | if (session->conn_cnt == 1 || session->leadconn == conn) | |
147 | session->state = ISCSI_STATE_FAILED; | |
148 | spin_unlock_irqrestore(&session->lock, flags); | |
149 | set_bit(SUSPEND_BIT, &conn->suspend_tx); | |
150 | set_bit(SUSPEND_BIT, &conn->suspend_rx); | |
151 | iscsi_conn_error(iscsi_handle(conn), err); | |
152 | } | |
153 | ||
154 | static inline int | |
155 | iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
156 | { | |
157 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
158 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
159 | ||
160 | if (max_cmdsn < exp_cmdsn -1 && | |
161 | max_cmdsn > exp_cmdsn - INVALID_SN_DELTA) | |
162 | return ISCSI_ERR_MAX_CMDSN; | |
163 | if (max_cmdsn > session->max_cmdsn || | |
164 | max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA) | |
165 | session->max_cmdsn = max_cmdsn; | |
166 | if (exp_cmdsn > session->exp_cmdsn || | |
167 | exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA) | |
168 | session->exp_cmdsn = exp_cmdsn; | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static inline int | |
174 | iscsi_hdr_extract(struct iscsi_conn *conn) | |
175 | { | |
176 | struct sk_buff *skb = conn->in.skb; | |
177 | ||
178 | if (conn->in.copy >= conn->hdr_size && | |
179 | conn->in_progress == IN_PROGRESS_WAIT_HEADER) { | |
180 | /* | |
181 | * Zero-copy PDU Header: using connection context | |
182 | * to store header pointer. | |
183 | */ | |
184 | if (skb_shinfo(skb)->frag_list == NULL && | |
185 | !skb_shinfo(skb)->nr_frags) | |
186 | conn->in.hdr = (struct iscsi_hdr *) | |
187 | ((char*)skb->data + conn->in.offset); | |
188 | else { | |
189 | /* ignoring return code since we checked | |
190 | * in.copy before */ | |
191 | skb_copy_bits(skb, conn->in.offset, | |
192 | &conn->hdr, conn->hdr_size); | |
193 | conn->in.hdr = &conn->hdr; | |
194 | } | |
195 | conn->in.offset += conn->hdr_size; | |
196 | conn->in.copy -= conn->hdr_size; | |
197 | } else { | |
198 | int hdr_remains; | |
199 | int copylen; | |
200 | ||
201 | /* | |
202 | * PDU header scattered across SKB's, | |
203 | * copying it... This'll happen quite rarely. | |
204 | */ | |
205 | ||
206 | if (conn->in_progress == IN_PROGRESS_WAIT_HEADER) | |
207 | conn->in.hdr_offset = 0; | |
208 | ||
209 | hdr_remains = conn->hdr_size - conn->in.hdr_offset; | |
210 | BUG_ON(hdr_remains <= 0); | |
211 | ||
212 | copylen = min(conn->in.copy, hdr_remains); | |
213 | skb_copy_bits(skb, conn->in.offset, | |
214 | (char*)&conn->hdr + conn->in.hdr_offset, copylen); | |
215 | ||
216 | debug_tcp("PDU gather offset %d bytes %d in.offset %d " | |
217 | "in.copy %d\n", conn->in.hdr_offset, copylen, | |
218 | conn->in.offset, conn->in.copy); | |
219 | ||
220 | conn->in.offset += copylen; | |
221 | conn->in.copy -= copylen; | |
222 | if (copylen < hdr_remains) { | |
223 | conn->in_progress = IN_PROGRESS_HEADER_GATHER; | |
224 | conn->in.hdr_offset += copylen; | |
225 | return -EAGAIN; | |
226 | } | |
227 | conn->in.hdr = &conn->hdr; | |
228 | conn->discontiguous_hdr_cnt++; | |
229 | conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static inline void | |
236 | iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
237 | { | |
238 | struct scsi_cmnd *sc = ctask->sc; | |
239 | struct iscsi_session *session = conn->session; | |
240 | ||
241 | spin_lock(&session->lock); | |
242 | if (unlikely(!sc)) { | |
243 | spin_unlock(&session->lock); | |
244 | return; | |
245 | } | |
246 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
247 | struct iscsi_data_task *dtask, *n; | |
248 | /* WRITE: cleanup Data-Out's if any */ | |
249 | spin_lock(&conn->lock); | |
250 | list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) { | |
251 | list_del(&dtask->item); | |
252 | mempool_free(dtask, ctask->datapool); | |
253 | } | |
254 | spin_unlock(&conn->lock); | |
255 | } | |
256 | ctask->xmstate = XMSTATE_IDLE; | |
257 | ctask->r2t = NULL; | |
258 | ctask->sc = NULL; | |
259 | __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); | |
260 | spin_unlock(&session->lock); | |
261 | } | |
262 | ||
263 | /** | |
264 | * iscsi_cmd_rsp - SCSI Command Response processing | |
265 | * @conn: iscsi connection | |
266 | * @ctask: scsi command task | |
267 | **/ | |
268 | static int | |
269 | iscsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
270 | { | |
271 | int rc; | |
272 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)conn->in.hdr; | |
273 | struct iscsi_session *session = conn->session; | |
274 | struct scsi_cmnd *sc = ctask->sc; | |
275 | ||
276 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
277 | if (rc) { | |
278 | sc->result = (DID_ERROR << 16); | |
279 | goto out; | |
280 | } | |
281 | ||
282 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
283 | ||
284 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
285 | ||
286 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
287 | sc->result = (DID_ERROR << 16); | |
288 | goto out; | |
289 | } | |
290 | ||
291 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION && conn->senselen) { | |
292 | int sensecopy = min(conn->senselen, SCSI_SENSE_BUFFERSIZE); | |
293 | ||
294 | memcpy(sc->sense_buffer, conn->data + 2, sensecopy); | |
295 | debug_scsi("copied %d bytes of sense\n", sensecopy); | |
296 | } | |
297 | ||
298 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
299 | goto out; | |
300 | ||
301 | if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { | |
302 | int res_count = be32_to_cpu(rhdr->residual_count); | |
303 | ||
304 | if (res_count > 0 && res_count <= sc->request_bufflen) | |
305 | sc->resid = res_count; | |
306 | else | |
307 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
308 | } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) | |
309 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
310 | else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) | |
311 | sc->resid = be32_to_cpu(rhdr->residual_count); | |
312 | ||
313 | out: | |
314 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
315 | (long)sc, sc->result, ctask->itt); | |
316 | conn->scsirsp_pdus_cnt++; | |
317 | iscsi_ctask_cleanup(conn, ctask); | |
318 | sc->scsi_done(sc); | |
319 | return rc; | |
320 | } | |
321 | ||
322 | /** | |
323 | * iscsi_data_rsp - SCSI Data-In Response processing | |
324 | * @conn: iscsi connection | |
325 | * @ctask: scsi command task | |
326 | **/ | |
327 | static int | |
328 | iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
329 | { | |
330 | int rc; | |
331 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)conn->in.hdr; | |
332 | struct iscsi_session *session = conn->session; | |
333 | int datasn = be32_to_cpu(rhdr->datasn); | |
334 | ||
335 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
336 | if (rc) | |
337 | return rc; | |
338 | /* | |
339 | * setup Data-In byte counter (gets decremented..) | |
340 | */ | |
341 | ctask->data_count = conn->in.datalen; | |
342 | ||
343 | if (conn->in.datalen == 0) | |
344 | return 0; | |
345 | ||
346 | if (ctask->datasn != datasn) | |
347 | return ISCSI_ERR_DATASN; | |
348 | ||
349 | ctask->datasn++; | |
350 | ||
351 | ctask->data_offset = be32_to_cpu(rhdr->offset); | |
352 | if (ctask->data_offset + conn->in.datalen > ctask->total_length) | |
353 | return ISCSI_ERR_DATA_OFFSET; | |
354 | ||
355 | if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
356 | struct scsi_cmnd *sc = ctask->sc; | |
357 | ||
358 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
359 | if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { | |
360 | int res_count = be32_to_cpu(rhdr->residual_count); | |
361 | ||
362 | if (res_count > 0 && | |
363 | res_count <= sc->request_bufflen) { | |
364 | sc->resid = res_count; | |
365 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
366 | } else | |
367 | sc->result = (DID_BAD_TARGET << 16) | | |
368 | rhdr->cmd_status; | |
369 | } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) | |
370 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
371 | else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) { | |
372 | sc->resid = be32_to_cpu(rhdr->residual_count); | |
373 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
374 | } else | |
375 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
376 | } | |
377 | ||
378 | conn->datain_pdus_cnt++; | |
379 | return 0; | |
380 | } | |
381 | ||
382 | /** | |
383 | * iscsi_solicit_data_init - initialize first Data-Out | |
384 | * @conn: iscsi connection | |
385 | * @ctask: scsi command task | |
386 | * @r2t: R2T info | |
387 | * | |
388 | * Notes: | |
389 | * Initialize first Data-Out within this R2T sequence and finds | |
390 | * proper data_offset within this SCSI command. | |
391 | * | |
392 | * This function is called with connection lock taken. | |
393 | **/ | |
394 | static void | |
395 | iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
396 | struct iscsi_r2t_info *r2t) | |
397 | { | |
398 | struct iscsi_data *hdr; | |
399 | struct iscsi_data_task *dtask; | |
400 | struct scsi_cmnd *sc = ctask->sc; | |
401 | ||
402 | dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); | |
403 | BUG_ON(!dtask); | |
404 | hdr = &dtask->hdr; | |
405 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
406 | hdr->ttt = r2t->ttt; | |
407 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
408 | r2t->solicit_datasn++; | |
409 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
410 | memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); | |
411 | hdr->itt = ctask->hdr.itt; | |
412 | hdr->exp_statsn = r2t->exp_statsn; | |
413 | hdr->offset = cpu_to_be32(r2t->data_offset); | |
414 | if (r2t->data_length > conn->max_xmit_dlength) { | |
415 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
416 | r2t->data_count = conn->max_xmit_dlength; | |
417 | hdr->flags = 0; | |
418 | } else { | |
419 | hton24(hdr->dlength, r2t->data_length); | |
420 | r2t->data_count = r2t->data_length; | |
421 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
422 | } | |
423 | conn->dataout_pdus_cnt++; | |
424 | ||
425 | r2t->sent = 0; | |
426 | ||
af973481 MC |
427 | iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr, |
428 | sizeof(struct iscsi_hdr)); | |
7ba24713 AA |
429 | |
430 | r2t->dtask = dtask; | |
431 | ||
432 | if (sc->use_sg) { | |
433 | int i, sg_count = 0; | |
434 | struct scatterlist *sg = sc->request_buffer; | |
435 | ||
436 | r2t->sg = NULL; | |
437 | for (i = 0; i < sc->use_sg; i++, sg += 1) { | |
438 | /* FIXME: prefetch ? */ | |
439 | if (sg_count + sg->length > r2t->data_offset) { | |
440 | int page_offset; | |
441 | ||
442 | /* sg page found! */ | |
443 | ||
444 | /* offset within this page */ | |
445 | page_offset = r2t->data_offset - sg_count; | |
446 | ||
447 | /* fill in this buffer */ | |
448 | iscsi_buf_init_sg(&r2t->sendbuf, sg); | |
449 | r2t->sendbuf.sg.offset += page_offset; | |
450 | r2t->sendbuf.sg.length -= page_offset; | |
451 | ||
452 | /* xmit logic will continue with next one */ | |
453 | r2t->sg = sg + 1; | |
454 | break; | |
455 | } | |
456 | sg_count += sg->length; | |
457 | } | |
458 | BUG_ON(r2t->sg == NULL); | |
459 | } else | |
460 | iscsi_buf_init_iov(&ctask->sendbuf, | |
461 | (char*)sc->request_buffer + r2t->data_offset, | |
462 | r2t->data_count); | |
463 | ||
464 | list_add(&dtask->item, &ctask->dataqueue); | |
465 | } | |
466 | ||
467 | /** | |
468 | * iscsi_r2t_rsp - iSCSI R2T Response processing | |
469 | * @conn: iscsi connection | |
470 | * @ctask: scsi command task | |
471 | **/ | |
472 | static int | |
473 | iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
474 | { | |
475 | struct iscsi_r2t_info *r2t; | |
476 | struct iscsi_session *session = conn->session; | |
477 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)conn->in.hdr; | |
478 | int r2tsn = be32_to_cpu(rhdr->r2tsn); | |
479 | int rc; | |
480 | ||
481 | if (conn->in.ahslen) | |
482 | return ISCSI_ERR_AHSLEN; | |
483 | ||
484 | if (conn->in.datalen) | |
485 | return ISCSI_ERR_DATALEN; | |
486 | ||
487 | if (ctask->exp_r2tsn && ctask->exp_r2tsn != r2tsn) | |
488 | return ISCSI_ERR_R2TSN; | |
489 | ||
490 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
491 | if (rc) | |
492 | return rc; | |
493 | ||
494 | /* FIXME: use R2TSN to detect missing R2T */ | |
495 | ||
496 | /* fill-in new R2T associated with the task */ | |
497 | spin_lock(&session->lock); | |
498 | if (!ctask->sc || ctask->mtask || | |
499 | session->state != ISCSI_STATE_LOGGED_IN) { | |
500 | printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " | |
501 | "recovery...\n", ctask->itt); | |
502 | spin_unlock(&session->lock); | |
503 | return 0; | |
504 | } | |
505 | rc = __kfifo_get(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); | |
506 | BUG_ON(!rc); | |
507 | ||
508 | r2t->exp_statsn = rhdr->statsn; | |
509 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
510 | if (r2t->data_length == 0 || | |
511 | r2t->data_length > session->max_burst) { | |
512 | spin_unlock(&session->lock); | |
513 | return ISCSI_ERR_DATALEN; | |
514 | } | |
515 | ||
516 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); | |
517 | if (r2t->data_offset + r2t->data_length > ctask->total_length) { | |
518 | spin_unlock(&session->lock); | |
519 | return ISCSI_ERR_DATALEN; | |
520 | } | |
521 | ||
522 | r2t->ttt = rhdr->ttt; /* no flip */ | |
523 | r2t->solicit_datasn = 0; | |
524 | ||
525 | iscsi_solicit_data_init(conn, ctask, r2t); | |
526 | ||
527 | ctask->exp_r2tsn = r2tsn + 1; | |
528 | ctask->xmstate |= XMSTATE_SOL_HDR; | |
529 | __kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*)); | |
530 | __kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*)); | |
531 | ||
532 | schedule_work(&conn->xmitwork); | |
533 | conn->r2t_pdus_cnt++; | |
534 | spin_unlock(&session->lock); | |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
539 | static int | |
540 | iscsi_hdr_recv(struct iscsi_conn *conn) | |
541 | { | |
542 | int rc = 0; | |
543 | struct iscsi_hdr *hdr; | |
544 | struct iscsi_cmd_task *ctask; | |
545 | struct iscsi_session *session = conn->session; | |
546 | uint32_t cdgst, rdgst = 0; | |
547 | ||
548 | hdr = conn->in.hdr; | |
549 | ||
550 | /* verify PDU length */ | |
551 | conn->in.datalen = ntoh24(hdr->dlength); | |
552 | if (conn->in.datalen > conn->max_recv_dlength) { | |
553 | printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", | |
554 | conn->in.datalen, conn->max_recv_dlength); | |
555 | return ISCSI_ERR_DATALEN; | |
556 | } | |
557 | conn->data_copied = 0; | |
558 | ||
559 | /* read AHS */ | |
02cf9311 | 560 | conn->in.ahslen = hdr->hlength * 4; |
7ba24713 AA |
561 | conn->in.offset += conn->in.ahslen; |
562 | conn->in.copy -= conn->in.ahslen; | |
563 | if (conn->in.copy < 0) { | |
564 | printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " | |
565 | "%d bytes\n", conn->in.ahslen); | |
566 | return ISCSI_ERR_AHSLEN; | |
567 | } | |
568 | ||
569 | /* calculate read padding */ | |
570 | conn->in.padding = conn->in.datalen & (ISCSI_PAD_LEN-1); | |
571 | if (conn->in.padding) { | |
572 | conn->in.padding = ISCSI_PAD_LEN - conn->in.padding; | |
573 | debug_scsi("read padding %d bytes\n", conn->in.padding); | |
574 | } | |
575 | ||
576 | if (conn->hdrdgst_en) { | |
577 | struct scatterlist sg; | |
578 | ||
579 | sg_init_one(&sg, (u8 *)hdr, | |
580 | sizeof(struct iscsi_hdr) + conn->in.ahslen); | |
581 | crypto_digest_digest(conn->rx_tfm, &sg, 1, (u8 *)&cdgst); | |
582 | rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + | |
583 | conn->in.ahslen); | |
584 | } | |
585 | ||
586 | /* save opcode for later */ | |
587 | conn->in.opcode = hdr->opcode; | |
588 | ||
589 | /* verify itt (itt encoding: age+cid+itt) */ | |
590 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
591 | if ((hdr->itt & AGE_MASK) != | |
592 | (session->age << AGE_SHIFT)) { | |
593 | printk(KERN_ERR "iscsi_tcp: received itt %x expected " | |
594 | "session age (%x)\n", hdr->itt, | |
595 | session->age & AGE_MASK); | |
596 | return ISCSI_ERR_BAD_ITT; | |
597 | } | |
598 | ||
599 | if ((hdr->itt & CID_MASK) != (conn->id << CID_SHIFT)) { | |
600 | printk(KERN_ERR "iscsi_tcp: received itt %x, expected " | |
601 | "CID (%x)\n", hdr->itt, conn->id); | |
602 | return ISCSI_ERR_BAD_ITT; | |
603 | } | |
604 | conn->in.itt = hdr->itt & ITT_MASK; | |
605 | } else | |
606 | conn->in.itt = hdr->itt; | |
607 | ||
608 | debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", | |
609 | hdr->opcode, conn->in.offset, conn->in.copy, | |
610 | conn->in.ahslen, conn->in.datalen); | |
611 | ||
612 | if (conn->in.itt < session->cmds_max) { | |
613 | if (conn->hdrdgst_en && cdgst != rdgst) { | |
614 | printk(KERN_ERR "iscsi_tcp: itt %x: hdrdgst error " | |
615 | "recv 0x%x calc 0x%x\n", conn->in.itt, rdgst, | |
616 | cdgst); | |
617 | return ISCSI_ERR_HDR_DGST; | |
618 | } | |
619 | ||
620 | ctask = (struct iscsi_cmd_task *)session->cmds[conn->in.itt]; | |
621 | ||
622 | if (!ctask->sc) { | |
623 | printk(KERN_INFO "iscsi_tcp: dropping ctask with " | |
624 | "itt 0x%x\n", ctask->itt); | |
625 | conn->in.datalen = 0; /* force drop */ | |
626 | return 0; | |
627 | } | |
628 | ||
629 | if (ctask->sc->SCp.phase != session->age) { | |
630 | printk(KERN_ERR "iscsi_tcp: ctask's session age %d, " | |
631 | "expected %d\n", ctask->sc->SCp.phase, | |
632 | session->age); | |
633 | return ISCSI_ERR_SESSION_FAILED; | |
634 | } | |
635 | ||
636 | conn->in.ctask = ctask; | |
637 | ||
638 | debug_scsi("rsp [op 0x%x cid %d sc %lx itt 0x%x len %d]\n", | |
639 | hdr->opcode, conn->id, (long)ctask->sc, | |
640 | ctask->itt, conn->in.datalen); | |
641 | ||
642 | switch(conn->in.opcode) { | |
643 | case ISCSI_OP_SCSI_CMD_RSP: | |
644 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
645 | if (ctask->hdr.flags & ISCSI_FLAG_CMD_WRITE) | |
646 | rc = iscsi_cmd_rsp(conn, ctask); | |
647 | else if (!conn->in.datalen) | |
648 | rc = iscsi_cmd_rsp(conn, ctask); | |
649 | else | |
650 | /* | |
651 | * got sense or response data; copying PDU | |
652 | * Header to the connection's header | |
653 | * placeholder | |
654 | */ | |
655 | memcpy(&conn->hdr, hdr, | |
656 | sizeof(struct iscsi_hdr)); | |
657 | break; | |
658 | case ISCSI_OP_SCSI_DATA_IN: | |
659 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
660 | /* save flags for non-exceptional status */ | |
661 | conn->in.flags = hdr->flags; | |
662 | /* save cmd_status for sense data */ | |
663 | conn->in.cmd_status = | |
664 | ((struct iscsi_data_rsp*)hdr)->cmd_status; | |
665 | rc = iscsi_data_rsp(conn, ctask); | |
666 | break; | |
667 | case ISCSI_OP_R2T: | |
668 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
669 | if (ctask->hdr.flags & ISCSI_FLAG_CMD_WRITE && | |
670 | ctask->sc->sc_data_direction == DMA_TO_DEVICE) | |
671 | rc = iscsi_r2t_rsp(conn, ctask); | |
672 | else | |
673 | rc = ISCSI_ERR_PROTO; | |
674 | break; | |
7ba24713 AA |
675 | default: |
676 | rc = ISCSI_ERR_BAD_OPCODE; | |
677 | break; | |
678 | } | |
679 | } else if (conn->in.itt >= ISCSI_MGMT_ITT_OFFSET && | |
680 | conn->in.itt < ISCSI_MGMT_ITT_OFFSET + | |
681 | session->mgmtpool_max) { | |
682 | struct iscsi_mgmt_task *mtask = (struct iscsi_mgmt_task *) | |
683 | session->mgmt_cmds[conn->in.itt - | |
684 | ISCSI_MGMT_ITT_OFFSET]; | |
685 | ||
686 | debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
687 | conn->in.opcode, conn->id, mtask->itt, | |
688 | conn->in.datalen); | |
689 | ||
690 | switch(conn->in.opcode) { | |
691 | case ISCSI_OP_LOGIN_RSP: | |
692 | case ISCSI_OP_TEXT_RSP: | |
99744878 | 693 | case ISCSI_OP_LOGOUT_RSP: |
7ba24713 AA |
694 | rc = iscsi_check_assign_cmdsn(session, |
695 | (struct iscsi_nopin*)hdr); | |
696 | if (rc) | |
697 | break; | |
698 | ||
699 | if (!conn->in.datalen) { | |
700 | rc = iscsi_recv_pdu(iscsi_handle(conn), hdr, | |
701 | NULL, 0); | |
702 | if (conn->login_mtask != mtask) { | |
703 | spin_lock(&session->lock); | |
704 | __kfifo_put(session->mgmtpool.queue, | |
705 | (void*)&mtask, sizeof(void*)); | |
706 | spin_unlock(&session->lock); | |
707 | } | |
708 | } | |
709 | break; | |
710 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
711 | rc = iscsi_check_assign_cmdsn(session, | |
712 | (struct iscsi_nopin*)hdr); | |
713 | if (rc) | |
714 | break; | |
715 | ||
716 | if (conn->in.datalen || conn->in.ahslen) { | |
717 | rc = ISCSI_ERR_PROTO; | |
718 | break; | |
719 | } | |
720 | conn->tmfrsp_pdus_cnt++; | |
721 | spin_lock(&session->lock); | |
722 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
723 | __kfifo_put(session->mgmtpool.queue, | |
724 | (void*)&mtask, sizeof(void*)); | |
725 | conn->tmabort_state = | |
726 | ((struct iscsi_tm_rsp *)hdr)-> | |
baebc497 | 727 | response == ISCSI_TMF_RSP_COMPLETE ? |
7ba24713 AA |
728 | TMABORT_SUCCESS:TMABORT_FAILED; |
729 | /* unblock eh_abort() */ | |
730 | wake_up(&conn->ehwait); | |
731 | } | |
732 | spin_unlock(&session->lock); | |
733 | break; | |
99744878 MC |
734 | case ISCSI_OP_NOOP_IN: |
735 | if (hdr->ttt != ISCSI_RESERVED_TAG) { | |
736 | rc = ISCSI_ERR_PROTO; | |
737 | break; | |
738 | } | |
739 | rc = iscsi_check_assign_cmdsn(session, | |
740 | (struct iscsi_nopin*)hdr); | |
741 | if (rc) | |
742 | break; | |
743 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
744 | ||
745 | if (!conn->in.datalen) { | |
746 | struct iscsi_mgmt_task *mtask; | |
747 | ||
748 | rc = iscsi_recv_pdu(iscsi_handle(conn), hdr, | |
749 | NULL, 0); | |
750 | mtask = (struct iscsi_mgmt_task *) | |
751 | session->mgmt_cmds[conn->in.itt - | |
752 | ISCSI_MGMT_ITT_OFFSET]; | |
753 | if (conn->login_mtask != mtask) { | |
754 | spin_lock(&session->lock); | |
755 | __kfifo_put(session->mgmtpool.queue, | |
756 | (void*)&mtask, sizeof(void*)); | |
757 | spin_unlock(&session->lock); | |
758 | } | |
759 | } | |
760 | break; | |
7ba24713 AA |
761 | default: |
762 | rc = ISCSI_ERR_BAD_OPCODE; | |
763 | break; | |
764 | } | |
765 | } else if (conn->in.itt == ISCSI_RESERVED_TAG) { | |
99744878 MC |
766 | switch(conn->in.opcode) { |
767 | case ISCSI_OP_NOOP_IN: | |
768 | if (!conn->in.datalen) { | |
769 | rc = iscsi_check_assign_cmdsn(session, | |
7ba24713 | 770 | (struct iscsi_nopin*)hdr); |
99744878 MC |
771 | if (!rc && hdr->ttt != ISCSI_RESERVED_TAG) |
772 | rc = iscsi_recv_pdu(iscsi_handle(conn), | |
773 | hdr, NULL, 0); | |
774 | } else | |
775 | rc = ISCSI_ERR_PROTO; | |
776 | break; | |
777 | case ISCSI_OP_REJECT: | |
778 | /* we need sth like iscsi_reject_rsp()*/ | |
779 | case ISCSI_OP_ASYNC_EVENT: | |
780 | /* we need sth like iscsi_async_event_rsp() */ | |
7ba24713 | 781 | rc = ISCSI_ERR_BAD_OPCODE; |
99744878 MC |
782 | break; |
783 | default: | |
784 | rc = ISCSI_ERR_BAD_OPCODE; | |
785 | break; | |
786 | } | |
7ba24713 AA |
787 | } else |
788 | rc = ISCSI_ERR_BAD_ITT; | |
789 | ||
790 | return rc; | |
791 | } | |
792 | ||
793 | /** | |
794 | * iscsi_ctask_copy - copy skb bits to the destanation cmd task | |
795 | * @conn: iscsi connection | |
796 | * @ctask: scsi command task | |
797 | * @buf: buffer to copy to | |
798 | * @buf_size: size of buffer | |
799 | * @offset: offset within the buffer | |
800 | * | |
801 | * Notes: | |
802 | * The function calls skb_copy_bits() and updates per-connection and | |
803 | * per-cmd byte counters. | |
804 | * | |
805 | * Read counters (in bytes): | |
806 | * | |
807 | * conn->in.offset offset within in progress SKB | |
808 | * conn->in.copy left to copy from in progress SKB | |
809 | * including padding | |
810 | * conn->in.copied copied already from in progress SKB | |
811 | * conn->data_copied copied already from in progress buffer | |
812 | * ctask->sent total bytes sent up to the MidLayer | |
813 | * ctask->data_count left to copy from in progress Data-In | |
814 | * buf_left left to copy from in progress buffer | |
815 | **/ | |
816 | static inline int | |
817 | iscsi_ctask_copy(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
818 | void *buf, int buf_size, int offset) | |
819 | { | |
820 | int buf_left = buf_size - (conn->data_copied + offset); | |
821 | int size = min(conn->in.copy, buf_left); | |
822 | int rc; | |
823 | ||
824 | size = min(size, ctask->data_count); | |
825 | ||
826 | debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", | |
827 | size, conn->in.offset, conn->in.copied); | |
828 | ||
829 | BUG_ON(size <= 0); | |
830 | BUG_ON(ctask->sent + size > ctask->total_length); | |
831 | ||
832 | rc = skb_copy_bits(conn->in.skb, conn->in.offset, | |
833 | (char*)buf + (offset + conn->data_copied), size); | |
834 | /* must fit into skb->len */ | |
835 | BUG_ON(rc); | |
836 | ||
837 | conn->in.offset += size; | |
838 | conn->in.copy -= size; | |
839 | conn->in.copied += size; | |
840 | conn->data_copied += size; | |
841 | ctask->sent += size; | |
842 | ctask->data_count -= size; | |
843 | ||
844 | BUG_ON(conn->in.copy < 0); | |
845 | BUG_ON(ctask->data_count < 0); | |
846 | ||
847 | if (buf_size != (conn->data_copied + offset)) { | |
848 | if (!ctask->data_count) { | |
849 | BUG_ON(buf_size - conn->data_copied < 0); | |
850 | /* done with this PDU */ | |
851 | return buf_size - conn->data_copied; | |
852 | } | |
853 | return -EAGAIN; | |
854 | } | |
855 | ||
856 | /* done with this buffer or with both - PDU and buffer */ | |
857 | conn->data_copied = 0; | |
858 | return 0; | |
859 | } | |
860 | ||
861 | /** | |
862 | * iscsi_tcp_copy - copy skb bits to the destanation buffer | |
863 | * @conn: iscsi connection | |
864 | * @buf: buffer to copy to | |
865 | * @buf_size: number of bytes to copy | |
866 | * | |
867 | * Notes: | |
868 | * The function calls skb_copy_bits() and updates per-connection | |
869 | * byte counters. | |
870 | **/ | |
871 | static inline int | |
872 | iscsi_tcp_copy(struct iscsi_conn *conn, void *buf, int buf_size) | |
873 | { | |
874 | int buf_left = buf_size - conn->data_copied; | |
875 | int size = min(conn->in.copy, buf_left); | |
876 | int rc; | |
877 | ||
878 | debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", | |
879 | size, conn->in.offset, conn->data_copied); | |
880 | BUG_ON(size <= 0); | |
881 | ||
882 | rc = skb_copy_bits(conn->in.skb, conn->in.offset, | |
883 | (char*)buf + conn->data_copied, size); | |
884 | BUG_ON(rc); | |
885 | ||
886 | conn->in.offset += size; | |
887 | conn->in.copy -= size; | |
888 | conn->in.copied += size; | |
889 | conn->data_copied += size; | |
890 | ||
891 | if (buf_size != conn->data_copied) | |
892 | return -EAGAIN; | |
893 | ||
894 | return 0; | |
895 | } | |
896 | ||
897 | static inline void | |
898 | partial_sg_digest_update(struct iscsi_conn *conn, struct scatterlist *sg, | |
899 | int offset, int length) | |
900 | { | |
901 | struct scatterlist temp; | |
902 | ||
903 | memcpy(&temp, sg, sizeof(struct scatterlist)); | |
904 | temp.offset = offset; | |
905 | temp.length = length; | |
906 | crypto_digest_update(conn->data_rx_tfm, &temp, 1); | |
907 | } | |
908 | ||
909 | static int iscsi_scsi_data_in(struct iscsi_conn *conn) | |
910 | { | |
911 | struct iscsi_cmd_task *ctask = conn->in.ctask; | |
912 | struct scsi_cmnd *sc = ctask->sc; | |
913 | struct scatterlist tmp, *sg; | |
914 | int i, offset, rc = 0; | |
915 | ||
916 | BUG_ON((void*)ctask != sc->SCp.ptr); | |
917 | ||
918 | /* | |
919 | * copying Data-In into the Scsi_Cmnd | |
920 | */ | |
921 | if (!sc->use_sg) { | |
922 | i = ctask->data_count; | |
923 | rc = iscsi_ctask_copy(conn, ctask, sc->request_buffer, | |
924 | sc->request_bufflen, ctask->data_offset); | |
925 | if (rc == -EAGAIN) | |
926 | return rc; | |
927 | if (conn->datadgst_en) { | |
928 | sg_init_one(&tmp, sc->request_buffer, i); | |
929 | crypto_digest_update(conn->data_rx_tfm, &tmp, 1); | |
930 | } | |
931 | rc = 0; | |
932 | goto done; | |
933 | } | |
934 | ||
935 | offset = ctask->data_offset; | |
936 | sg = sc->request_buffer; | |
937 | ||
938 | if (ctask->data_offset) | |
939 | for (i = 0; i < ctask->sg_count; i++) | |
940 | offset -= sg[i].length; | |
941 | /* we've passed through partial sg*/ | |
942 | if (offset < 0) | |
943 | offset = 0; | |
944 | ||
945 | for (i = ctask->sg_count; i < sc->use_sg; i++) { | |
946 | char *dest; | |
947 | ||
948 | dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); | |
949 | rc = iscsi_ctask_copy(conn, ctask, dest + sg[i].offset, | |
950 | sg[i].length, offset); | |
951 | kunmap_atomic(dest, KM_SOFTIRQ0); | |
952 | if (rc == -EAGAIN) | |
953 | /* continue with the next SKB/PDU */ | |
954 | return rc; | |
955 | if (!rc) { | |
956 | if (conn->datadgst_en) { | |
957 | if (!offset) | |
958 | crypto_digest_update(conn->data_rx_tfm, | |
959 | &sg[i], 1); | |
960 | else | |
961 | partial_sg_digest_update(conn, &sg[i], | |
962 | sg[i].offset + offset, | |
963 | sg[i].length - offset); | |
964 | } | |
965 | offset = 0; | |
966 | ctask->sg_count++; | |
967 | } | |
968 | ||
969 | if (!ctask->data_count) { | |
970 | if (rc && conn->datadgst_en) | |
971 | /* | |
972 | * data-in is complete, but buffer not... | |
973 | */ | |
974 | partial_sg_digest_update(conn, &sg[i], | |
975 | sg[i].offset, sg[i].length-rc); | |
976 | rc = 0; | |
977 | break; | |
978 | } | |
979 | ||
980 | if (!conn->in.copy) | |
981 | return -EAGAIN; | |
982 | } | |
983 | BUG_ON(ctask->data_count); | |
984 | ||
985 | done: | |
986 | /* check for non-exceptional status */ | |
987 | if (conn->in.flags & ISCSI_FLAG_DATA_STATUS) { | |
988 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
989 | (long)sc, sc->result, ctask->itt); | |
990 | conn->scsirsp_pdus_cnt++; | |
991 | iscsi_ctask_cleanup(conn, ctask); | |
992 | sc->scsi_done(sc); | |
993 | } | |
994 | ||
995 | return rc; | |
996 | } | |
997 | ||
998 | static int | |
999 | iscsi_data_recv(struct iscsi_conn *conn) | |
1000 | { | |
1001 | struct iscsi_session *session = conn->session; | |
1002 | int rc = 0; | |
1003 | ||
1004 | switch(conn->in.opcode) { | |
1005 | case ISCSI_OP_SCSI_DATA_IN: | |
1006 | rc = iscsi_scsi_data_in(conn); | |
1007 | break; | |
1008 | case ISCSI_OP_SCSI_CMD_RSP: { | |
1009 | /* | |
1010 | * SCSI Sense Data: | |
1011 | * copying the entire Data Segment. | |
1012 | */ | |
1013 | if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) { | |
1014 | rc = -EAGAIN; | |
1015 | goto exit; | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * check for sense | |
1020 | */ | |
1021 | conn->in.hdr = &conn->hdr; | |
1022 | conn->senselen = (conn->data[0] << 8) | conn->data[1]; | |
1023 | rc = iscsi_cmd_rsp(conn, conn->in.ctask); | |
1024 | } | |
1025 | break; | |
1026 | case ISCSI_OP_TEXT_RSP: | |
1027 | case ISCSI_OP_LOGIN_RSP: | |
1028 | case ISCSI_OP_NOOP_IN: { | |
1029 | struct iscsi_mgmt_task *mtask = NULL; | |
1030 | ||
1031 | if (conn->in.itt != ISCSI_RESERVED_TAG) | |
1032 | mtask = (struct iscsi_mgmt_task *) | |
1033 | session->mgmt_cmds[conn->in.itt - | |
1034 | ISCSI_MGMT_ITT_OFFSET]; | |
1035 | ||
1036 | /* | |
1037 | * Collect data segment to the connection's data | |
1038 | * placeholder | |
1039 | */ | |
1040 | if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) { | |
1041 | rc = -EAGAIN; | |
1042 | goto exit; | |
1043 | } | |
1044 | ||
1045 | rc = iscsi_recv_pdu(iscsi_handle(conn), conn->in.hdr, | |
1046 | conn->data, conn->in.datalen); | |
1047 | ||
1048 | if (mtask && conn->login_mtask != mtask) { | |
1049 | spin_lock(&session->lock); | |
1050 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, | |
1051 | sizeof(void*)); | |
1052 | spin_unlock(&session->lock); | |
1053 | } | |
1054 | } | |
1055 | break; | |
1056 | default: | |
1057 | BUG_ON(1); | |
1058 | } | |
1059 | exit: | |
1060 | return rc; | |
1061 | } | |
1062 | ||
1063 | /** | |
1064 | * iscsi_tcp_data_recv - TCP receive in sendfile fashion | |
1065 | * @rd_desc: read descriptor | |
1066 | * @skb: socket buffer | |
1067 | * @offset: offset in skb | |
1068 | * @len: skb->len - offset | |
1069 | **/ | |
1070 | static int | |
1071 | iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
1072 | unsigned int offset, size_t len) | |
1073 | { | |
1074 | int rc; | |
1075 | struct iscsi_conn *conn = rd_desc->arg.data; | |
7ba24713 AA |
1076 | int processed; |
1077 | char pad[ISCSI_PAD_LEN]; | |
1078 | struct scatterlist sg; | |
1079 | ||
1080 | /* | |
1081 | * Save current SKB and its offset in the corresponding | |
1082 | * connection context. | |
1083 | */ | |
bb052349 | 1084 | conn->in.copy = skb->len - offset; |
7ba24713 AA |
1085 | conn->in.offset = offset; |
1086 | conn->in.skb = skb; | |
1087 | conn->in.len = conn->in.copy; | |
1088 | BUG_ON(conn->in.copy <= 0); | |
1089 | debug_tcp("in %d bytes\n", conn->in.copy); | |
1090 | ||
1091 | more: | |
1092 | conn->in.copied = 0; | |
1093 | rc = 0; | |
1094 | ||
1095 | if (unlikely(conn->suspend_rx)) { | |
1096 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | if (conn->in_progress == IN_PROGRESS_WAIT_HEADER || | |
1101 | conn->in_progress == IN_PROGRESS_HEADER_GATHER) { | |
1102 | rc = iscsi_hdr_extract(conn); | |
1103 | if (rc) { | |
1104 | if (rc == -EAGAIN) | |
1105 | goto nomore; | |
1106 | else { | |
1107 | iscsi_conn_failure(conn, rc); | |
1108 | return 0; | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * Verify and process incoming PDU header. | |
1114 | */ | |
1115 | rc = iscsi_hdr_recv(conn); | |
1116 | if (!rc && conn->in.datalen) { | |
1117 | if (conn->datadgst_en && | |
1118 | conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) { | |
1119 | BUG_ON(!conn->data_rx_tfm); | |
1120 | crypto_digest_init(conn->data_rx_tfm); | |
1121 | } | |
1122 | conn->in_progress = IN_PROGRESS_DATA_RECV; | |
1123 | } else if (rc) { | |
1124 | iscsi_conn_failure(conn, rc); | |
1125 | return 0; | |
1126 | } | |
1127 | } | |
1128 | ||
1129 | if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { | |
1130 | debug_tcp("extra data_recv offset %d copy %d\n", | |
1131 | conn->in.offset, conn->in.copy); | |
1132 | if (conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) { | |
1133 | uint32_t recv_digest; | |
1134 | skb_copy_bits(conn->in.skb, conn->in.offset, | |
1135 | &recv_digest, 4); | |
1136 | conn->in.offset += 4; | |
1137 | conn->in.copy -= 4; | |
1138 | if (recv_digest != conn->in.datadgst) { | |
1139 | debug_tcp("iscsi_tcp: data digest error!" | |
1140 | "0x%x != 0x%x\n", recv_digest, | |
1141 | conn->in.datadgst); | |
1142 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); | |
1143 | return 0; | |
1144 | } else { | |
1145 | debug_tcp("iscsi_tcp: data digest match!" | |
1146 | "0x%x == 0x%x\n", recv_digest, | |
1147 | conn->in.datadgst); | |
1148 | conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
1149 | } | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | if (conn->in_progress == IN_PROGRESS_DATA_RECV && conn->in.copy) { | |
1154 | ||
1155 | debug_tcp("data_recv offset %d copy %d\n", | |
1156 | conn->in.offset, conn->in.copy); | |
1157 | ||
1158 | rc = iscsi_data_recv(conn); | |
1159 | if (rc) { | |
1160 | if (rc == -EAGAIN) { | |
1161 | rd_desc->count = conn->in.datalen - | |
1162 | conn->in.ctask->data_count; | |
1163 | goto again; | |
1164 | } | |
1165 | iscsi_conn_failure(conn, rc); | |
1166 | return 0; | |
1167 | } | |
1168 | conn->in.copy -= conn->in.padding; | |
1169 | conn->in.offset += conn->in.padding; | |
1170 | if (conn->datadgst_en && | |
1171 | conn->in.opcode == ISCSI_OP_SCSI_DATA_IN) { | |
1172 | if (conn->in.padding) { | |
1173 | debug_tcp("padding -> %d\n", conn->in.padding); | |
1174 | memset(pad, 0, conn->in.padding); | |
1175 | sg_init_one(&sg, pad, conn->in.padding); | |
1176 | crypto_digest_update(conn->data_rx_tfm, &sg, 1); | |
1177 | } | |
1178 | crypto_digest_final(conn->data_rx_tfm, | |
1179 | (u8 *) & conn->in.datadgst); | |
1180 | debug_tcp("rx digest 0x%x\n", conn->in.datadgst); | |
1181 | conn->in_progress = IN_PROGRESS_DDIGEST_RECV; | |
1182 | } else | |
1183 | conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
1184 | } | |
1185 | ||
1186 | debug_tcp("f, processed %d from out of %d padding %d\n", | |
1187 | conn->in.offset - offset, (int)len, conn->in.padding); | |
1188 | BUG_ON(conn->in.offset - offset > len); | |
1189 | ||
1190 | if (conn->in.offset - offset != len) { | |
1191 | debug_tcp("continue to process %d bytes\n", | |
1192 | (int)len - (conn->in.offset - offset)); | |
1193 | goto more; | |
1194 | } | |
1195 | ||
1196 | nomore: | |
1197 | processed = conn->in.offset - offset; | |
1198 | BUG_ON(processed == 0); | |
1199 | return processed; | |
1200 | ||
1201 | again: | |
1202 | processed = conn->in.offset - offset; | |
1203 | debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", | |
1204 | processed, (int)len, (int)rd_desc->count); | |
1205 | BUG_ON(processed == 0); | |
1206 | BUG_ON(processed > len); | |
1207 | ||
1208 | conn->rxdata_octets += processed; | |
1209 | return processed; | |
1210 | } | |
1211 | ||
1212 | static void | |
1213 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
1214 | { | |
1215 | struct iscsi_conn *conn = sk->sk_user_data; | |
1216 | read_descriptor_t rd_desc; | |
1217 | ||
1218 | read_lock(&sk->sk_callback_lock); | |
1219 | ||
1220 | /* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */ | |
1221 | rd_desc.arg.data = conn; | |
1222 | rd_desc.count = 0; | |
1223 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); | |
1224 | ||
1225 | read_unlock(&sk->sk_callback_lock); | |
1226 | } | |
1227 | ||
1228 | static void | |
1229 | iscsi_tcp_state_change(struct sock *sk) | |
1230 | { | |
1231 | struct iscsi_conn *conn; | |
1232 | struct iscsi_session *session; | |
1233 | void (*old_state_change)(struct sock *); | |
1234 | ||
1235 | read_lock(&sk->sk_callback_lock); | |
1236 | ||
1237 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
1238 | session = conn->session; | |
1239 | ||
1240 | if (sk->sk_state == TCP_CLOSE_WAIT || | |
1241 | sk->sk_state == TCP_CLOSE) { | |
1242 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); | |
1243 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1244 | } | |
1245 | ||
1246 | old_state_change = conn->old_state_change; | |
1247 | ||
1248 | read_unlock(&sk->sk_callback_lock); | |
1249 | ||
1250 | old_state_change(sk); | |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * iscsi_write_space - Called when more output buffer space is available | |
1255 | * @sk: socket space is available for | |
1256 | **/ | |
1257 | static void | |
1258 | iscsi_write_space(struct sock *sk) | |
1259 | { | |
1260 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
1261 | conn->old_write_space(sk); | |
1262 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); | |
1263 | clear_bit(SUSPEND_BIT, &conn->suspend_tx); | |
1264 | schedule_work(&conn->xmitwork); | |
1265 | } | |
1266 | ||
1267 | static void | |
1268 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1269 | { | |
1270 | struct sock *sk = conn->sock->sk; | |
1271 | ||
1272 | /* assign new callbacks */ | |
1273 | write_lock_bh(&sk->sk_callback_lock); | |
1274 | sk->sk_user_data = conn; | |
1275 | conn->old_data_ready = sk->sk_data_ready; | |
1276 | conn->old_state_change = sk->sk_state_change; | |
1277 | conn->old_write_space = sk->sk_write_space; | |
1278 | sk->sk_data_ready = iscsi_tcp_data_ready; | |
1279 | sk->sk_state_change = iscsi_tcp_state_change; | |
1280 | sk->sk_write_space = iscsi_write_space; | |
1281 | write_unlock_bh(&sk->sk_callback_lock); | |
1282 | } | |
1283 | ||
1284 | static void | |
1285 | iscsi_conn_restore_callbacks(struct iscsi_conn *conn) | |
1286 | { | |
1287 | struct sock *sk = conn->sock->sk; | |
1288 | ||
1289 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1290 | write_lock_bh(&sk->sk_callback_lock); | |
1291 | sk->sk_user_data = NULL; | |
1292 | sk->sk_data_ready = conn->old_data_ready; | |
1293 | sk->sk_state_change = conn->old_state_change; | |
1294 | sk->sk_write_space = conn->old_write_space; | |
1295 | sk->sk_no_check = 0; | |
1296 | write_unlock_bh(&sk->sk_callback_lock); | |
1297 | } | |
1298 | ||
1299 | /** | |
1300 | * iscsi_send - generic send routine | |
1301 | * @sk: kernel's socket | |
1302 | * @buf: buffer to write from | |
1303 | * @size: actual size to write | |
1304 | * @flags: socket's flags | |
1305 | * | |
1306 | * Notes: | |
1307 | * depending on buffer will use tcp_sendpage() or tcp_sendmsg(). | |
1308 | * buf->sg.offset == -1 tells us that buffer is non S/G and forces | |
1309 | * to use tcp_sendmsg(). | |
1310 | */ | |
1311 | static inline int | |
1312 | iscsi_send(struct socket *sk, struct iscsi_buf *buf, int size, int flags) | |
1313 | { | |
1314 | int res; | |
1315 | ||
1316 | if ((int)buf->sg.offset >= 0) { | |
1317 | int offset = buf->sg.offset + buf->sent; | |
1318 | ||
1319 | /* tcp_sendpage */ | |
1320 | res = sk->ops->sendpage(sk, buf->sg.page, offset, size, flags); | |
1321 | } else { | |
1322 | struct msghdr msg; | |
1323 | ||
1324 | buf->iov.iov_base = iscsi_buf_iov_base(buf); | |
1325 | buf->iov.iov_len = size; | |
1326 | ||
1327 | memset(&msg, 0, sizeof(struct msghdr)); | |
1328 | ||
1329 | /* tcp_sendmsg */ | |
1330 | res = kernel_sendmsg(sk, &msg, &buf->iov, 1, size); | |
1331 | } | |
1332 | ||
1333 | return res; | |
1334 | } | |
1335 | ||
1336 | /** | |
1337 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() | |
1338 | * @conn: iscsi connection | |
1339 | * @buf: buffer to write from | |
1340 | * @datalen: lenght of data to be sent after the header | |
1341 | * | |
1342 | * Notes: | |
1343 | * (Tx, Fast Path) | |
1344 | **/ | |
1345 | static inline int | |
1346 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) | |
1347 | { | |
1348 | struct socket *sk = conn->sock; | |
1349 | int flags = 0; /* MSG_DONTWAIT; */ | |
1350 | int res, size; | |
1351 | ||
1352 | size = buf->sg.length - buf->sent; | |
1353 | BUG_ON(buf->sent + size > buf->sg.length); | |
1354 | if (buf->sent + size != buf->sg.length || datalen) | |
1355 | flags |= MSG_MORE; | |
1356 | ||
1357 | res = iscsi_send(sk, buf, size, flags); | |
1358 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); | |
1359 | if (res >= 0) { | |
1360 | conn->txdata_octets += res; | |
1361 | buf->sent += res; | |
1362 | if (size != res) | |
1363 | return -EAGAIN; | |
1364 | return 0; | |
1365 | } else if (res == -EAGAIN) { | |
1366 | conn->sendpage_failures_cnt++; | |
1367 | set_bit(SUSPEND_BIT, &conn->suspend_tx); | |
1368 | } else if (res == -EPIPE) | |
1369 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1370 | ||
1371 | return res; | |
1372 | } | |
1373 | ||
1374 | /** | |
1375 | * iscsi_sendpage - send one page of iSCSI Data-Out. | |
1376 | * @conn: iscsi connection | |
1377 | * @buf: buffer to write from | |
1378 | * @count: remaining data | |
1379 | * @sent: number of bytes sent | |
1380 | * | |
1381 | * Notes: | |
1382 | * (Tx, Fast Path) | |
1383 | **/ | |
1384 | static inline int | |
1385 | iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, | |
1386 | int *count, int *sent) | |
1387 | { | |
1388 | struct socket *sk = conn->sock; | |
1389 | int flags = 0; /* MSG_DONTWAIT; */ | |
1390 | int res, size; | |
1391 | ||
1392 | size = buf->sg.length - buf->sent; | |
1393 | BUG_ON(buf->sent + size > buf->sg.length); | |
1394 | if (size > *count) | |
1395 | size = *count; | |
b13941f6 | 1396 | if (buf->sent + size != buf->sg.length || *count != size) |
7ba24713 AA |
1397 | flags |= MSG_MORE; |
1398 | ||
1399 | res = iscsi_send(sk, buf, size, flags); | |
1400 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", | |
1401 | size, buf->sent, *count, *sent, res); | |
1402 | if (res >= 0) { | |
1403 | conn->txdata_octets += res; | |
1404 | buf->sent += res; | |
1405 | *count -= res; | |
1406 | *sent += res; | |
1407 | if (size != res) | |
1408 | return -EAGAIN; | |
1409 | return 0; | |
1410 | } else if (res == -EAGAIN) { | |
1411 | conn->sendpage_failures_cnt++; | |
1412 | set_bit(SUSPEND_BIT, &conn->suspend_tx); | |
1413 | } else if (res == -EPIPE) | |
1414 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1415 | ||
1416 | return res; | |
1417 | } | |
1418 | ||
1419 | static inline void | |
1420 | iscsi_data_digest_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1421 | { | |
1422 | BUG_ON(!conn->data_tx_tfm); | |
1423 | crypto_digest_init(conn->data_tx_tfm); | |
1424 | ctask->digest_count = 4; | |
1425 | } | |
1426 | ||
1427 | static inline void | |
1428 | iscsi_buf_data_digest_update(struct iscsi_conn *conn, struct iscsi_buf *buf) | |
1429 | { | |
1430 | struct scatterlist sg; | |
1431 | ||
1432 | if (buf->sg.offset != -1) | |
1433 | crypto_digest_update(conn->data_tx_tfm, &buf->sg, 1); | |
1434 | else { | |
1435 | sg_init_one(&sg, (char *)buf->sg.page, buf->sg.length); | |
1436 | crypto_digest_update(conn->data_tx_tfm, &sg, 1); | |
1437 | } | |
1438 | } | |
1439 | ||
1440 | static inline int | |
1441 | iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1442 | struct iscsi_buf *buf, uint32_t *digest, int final) | |
1443 | { | |
1444 | int rc = 0; | |
1445 | int sent = 0; | |
1446 | ||
1447 | if (final) | |
1448 | crypto_digest_final(conn->data_tx_tfm, (u8*)digest); | |
1449 | ||
1450 | iscsi_buf_init_virt(buf, (char*)digest, 4); | |
1451 | rc = iscsi_sendpage(conn, buf, &ctask->digest_count, &sent); | |
1452 | if (rc) { | |
1453 | ctask->datadigest = *digest; | |
1454 | ctask->xmstate |= XMSTATE_DATA_DIGEST; | |
1455 | } else | |
1456 | ctask->digest_count = 4; | |
1457 | return rc; | |
1458 | } | |
1459 | ||
1460 | /** | |
1461 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1462 | * @conn: iscsi connection | |
1463 | * @ctask: scsi command task | |
1464 | * @r2t: R2T info | |
1465 | * @left: bytes left to transfer | |
1466 | * | |
1467 | * Notes: | |
1468 | * Initialize next Data-Out within this R2T sequence and continue | |
1469 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1470 | * | |
1471 | * Called under connection lock. | |
1472 | **/ | |
1473 | static void | |
1474 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1475 | struct iscsi_r2t_info *r2t, int left) | |
1476 | { | |
1477 | struct iscsi_data *hdr; | |
1478 | struct iscsi_data_task *dtask; | |
1479 | struct scsi_cmnd *sc = ctask->sc; | |
1480 | int new_offset; | |
1481 | ||
1482 | dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); | |
1483 | BUG_ON(!dtask); | |
1484 | hdr = &dtask->hdr; | |
1485 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
1486 | hdr->ttt = r2t->ttt; | |
1487 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1488 | r2t->solicit_datasn++; | |
1489 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
1490 | memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); | |
1491 | hdr->itt = ctask->hdr.itt; | |
1492 | hdr->exp_statsn = r2t->exp_statsn; | |
1493 | new_offset = r2t->data_offset + r2t->sent; | |
1494 | hdr->offset = cpu_to_be32(new_offset); | |
1495 | if (left > conn->max_xmit_dlength) { | |
1496 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1497 | r2t->data_count = conn->max_xmit_dlength; | |
1498 | } else { | |
1499 | hton24(hdr->dlength, left); | |
1500 | r2t->data_count = left; | |
1501 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1502 | } | |
1503 | conn->dataout_pdus_cnt++; | |
1504 | ||
af973481 MC |
1505 | iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr, |
1506 | sizeof(struct iscsi_hdr)); | |
7ba24713 AA |
1507 | |
1508 | r2t->dtask = dtask; | |
1509 | ||
1510 | if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { | |
1511 | BUG_ON(ctask->bad_sg == r2t->sg); | |
1512 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); | |
1513 | r2t->sg += 1; | |
1514 | } else | |
1515 | iscsi_buf_init_iov(&ctask->sendbuf, | |
1516 | (char*)sc->request_buffer + new_offset, | |
1517 | r2t->data_count); | |
1518 | ||
1519 | list_add(&dtask->item, &ctask->dataqueue); | |
1520 | } | |
1521 | ||
1522 | static void | |
1523 | iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1524 | { | |
1525 | struct iscsi_data *hdr; | |
1526 | struct iscsi_data_task *dtask; | |
1527 | ||
1528 | dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); | |
1529 | BUG_ON(!dtask); | |
1530 | hdr = &dtask->hdr; | |
1531 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
1532 | hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
1533 | hdr->datasn = cpu_to_be32(ctask->unsol_datasn); | |
1534 | ctask->unsol_datasn++; | |
1535 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
1536 | memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); | |
1537 | hdr->itt = ctask->hdr.itt; | |
1538 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
1539 | hdr->offset = cpu_to_be32(ctask->total_length - | |
1540 | ctask->r2t_data_count - | |
1541 | ctask->unsol_count); | |
1542 | if (ctask->unsol_count > conn->max_xmit_dlength) { | |
1543 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1544 | ctask->data_count = conn->max_xmit_dlength; | |
1545 | hdr->flags = 0; | |
1546 | } else { | |
1547 | hton24(hdr->dlength, ctask->unsol_count); | |
1548 | ctask->data_count = ctask->unsol_count; | |
1549 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1550 | } | |
1551 | ||
af973481 MC |
1552 | iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr, |
1553 | sizeof(struct iscsi_hdr)); | |
7ba24713 AA |
1554 | |
1555 | list_add(&dtask->item, &ctask->dataqueue); | |
1556 | ||
1557 | ctask->dtask = dtask; | |
1558 | } | |
1559 | ||
1560 | /** | |
1561 | * iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands | |
1562 | * @conn: iscsi connection | |
1563 | * @ctask: scsi command task | |
1564 | * @sc: scsi command | |
1565 | **/ | |
1566 | static void | |
1567 | iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1568 | struct scsi_cmnd *sc) | |
1569 | { | |
1570 | struct iscsi_session *session = conn->session; | |
1571 | ||
1572 | BUG_ON(__kfifo_len(ctask->r2tqueue)); | |
1573 | ||
1574 | ctask->sc = sc; | |
1575 | ctask->conn = conn; | |
1576 | ctask->hdr.opcode = ISCSI_OP_SCSI_CMD; | |
1577 | ctask->hdr.flags = ISCSI_ATTR_SIMPLE; | |
1578 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)ctask->hdr.lun); | |
1579 | ctask->hdr.itt = ctask->itt | (conn->id << CID_SHIFT) | | |
1580 | (session->age << AGE_SHIFT); | |
1581 | ctask->hdr.data_length = cpu_to_be32(sc->request_bufflen); | |
1582 | ctask->hdr.cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++; | |
1583 | ctask->hdr.exp_statsn = cpu_to_be32(conn->exp_statsn); | |
1584 | memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len); | |
1585 | memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len); | |
1586 | ||
1587 | ctask->mtask = NULL; | |
1588 | ctask->sent = 0; | |
1589 | ctask->sg_count = 0; | |
1590 | ||
1591 | ctask->total_length = sc->request_bufflen; | |
1592 | ||
1593 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
1594 | ctask->exp_r2tsn = 0; | |
1595 | ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE; | |
1596 | BUG_ON(ctask->total_length == 0); | |
1597 | if (sc->use_sg) { | |
1598 | struct scatterlist *sg = sc->request_buffer; | |
1599 | ||
1600 | iscsi_buf_init_sg(&ctask->sendbuf, | |
1601 | &sg[ctask->sg_count++]); | |
1602 | ctask->sg = sg; | |
1603 | ctask->bad_sg = sg + sc->use_sg; | |
1604 | } else { | |
1605 | iscsi_buf_init_iov(&ctask->sendbuf, sc->request_buffer, | |
1606 | sc->request_bufflen); | |
1607 | } | |
1608 | ||
1609 | /* | |
1610 | * Write counters: | |
1611 | * | |
1612 | * imm_count bytes to be sent right after | |
1613 | * SCSI PDU Header | |
1614 | * | |
1615 | * unsol_count bytes(as Data-Out) to be sent | |
1616 | * without R2T ack right after | |
1617 | * immediate data | |
1618 | * | |
1619 | * r2t_data_count bytes to be sent via R2T ack's | |
1620 | * | |
1621 | * pad_count bytes to be sent as zero-padding | |
1622 | */ | |
1623 | ctask->imm_count = 0; | |
1624 | ctask->unsol_count = 0; | |
1625 | ctask->unsol_datasn = 0; | |
1626 | ctask->xmstate = XMSTATE_W_HDR; | |
1627 | /* calculate write padding */ | |
1628 | ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); | |
1629 | if (ctask->pad_count) { | |
1630 | ctask->pad_count = ISCSI_PAD_LEN - ctask->pad_count; | |
1631 | debug_scsi("write padding %d bytes\n", | |
1632 | ctask->pad_count); | |
1633 | ctask->xmstate |= XMSTATE_W_PAD; | |
1634 | } | |
1635 | if (session->imm_data_en) { | |
1636 | if (ctask->total_length >= session->first_burst) | |
1637 | ctask->imm_count = min(session->first_burst, | |
1638 | conn->max_xmit_dlength); | |
1639 | else | |
1640 | ctask->imm_count = min(ctask->total_length, | |
1641 | conn->max_xmit_dlength); | |
1642 | hton24(ctask->hdr.dlength, ctask->imm_count); | |
1643 | ctask->xmstate |= XMSTATE_IMM_DATA; | |
1644 | } else | |
1645 | zero_data(ctask->hdr.dlength); | |
1646 | ||
1647 | if (!session->initial_r2t_en) | |
1648 | ctask->unsol_count = min(session->first_burst, | |
1649 | ctask->total_length) - ctask->imm_count; | |
1650 | if (!ctask->unsol_count) | |
1651 | /* No unsolicit Data-Out's */ | |
1652 | ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL; | |
1653 | else | |
1654 | ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT; | |
1655 | ||
1656 | ctask->r2t_data_count = ctask->total_length - | |
1657 | ctask->imm_count - | |
1658 | ctask->unsol_count; | |
1659 | ||
1660 | debug_scsi("cmd [itt %x total %d imm %d imm_data %d " | |
1661 | "r2t_data %d]\n", | |
1662 | ctask->itt, ctask->total_length, ctask->imm_count, | |
1663 | ctask->unsol_count, ctask->r2t_data_count); | |
1664 | } else { | |
1665 | ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL; | |
1666 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
1667 | ctask->hdr.flags |= ISCSI_FLAG_CMD_READ; | |
1668 | ctask->datasn = 0; | |
1669 | ctask->xmstate = XMSTATE_R_HDR; | |
1670 | zero_data(ctask->hdr.dlength); | |
1671 | } | |
1672 | ||
af973481 MC |
1673 | iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr, |
1674 | sizeof(struct iscsi_hdr)); | |
7ba24713 AA |
1675 | conn->scsicmd_pdus_cnt++; |
1676 | } | |
1677 | ||
1678 | /** | |
1679 | * iscsi_mtask_xmit - xmit management(immediate) task | |
1680 | * @conn: iscsi connection | |
1681 | * @mtask: task management task | |
1682 | * | |
1683 | * Notes: | |
1684 | * The function can return -EAGAIN in which case caller must | |
1685 | * call it again later, or recover. '0' return code means successful | |
1686 | * xmit. | |
1687 | * | |
1688 | * Management xmit state machine consists of two states: | |
1689 | * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress | |
1690 | * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress | |
1691 | **/ | |
1692 | static int | |
1693 | iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) | |
1694 | { | |
1695 | ||
1696 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", | |
1697 | conn->id, mtask->xmstate, mtask->itt); | |
1698 | ||
1699 | if (mtask->xmstate & XMSTATE_IMM_HDR) { | |
1700 | mtask->xmstate &= ~XMSTATE_IMM_HDR; | |
1701 | if (mtask->data_count) | |
1702 | mtask->xmstate |= XMSTATE_IMM_DATA; | |
af973481 MC |
1703 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
1704 | conn->stop_stage != STOP_CONN_RECOVER && | |
1705 | conn->hdrdgst_en) | |
1706 | iscsi_hdr_digest(conn, &mtask->headbuf, | |
1707 | (u8*)mtask->hdrext); | |
7ba24713 AA |
1708 | if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) { |
1709 | mtask->xmstate |= XMSTATE_IMM_HDR; | |
1710 | if (mtask->data_count) | |
1711 | mtask->xmstate &= ~XMSTATE_IMM_DATA; | |
1712 | return -EAGAIN; | |
1713 | } | |
1714 | } | |
1715 | ||
1716 | if (mtask->xmstate & XMSTATE_IMM_DATA) { | |
1717 | BUG_ON(!mtask->data_count); | |
1718 | mtask->xmstate &= ~XMSTATE_IMM_DATA; | |
1719 | /* FIXME: implement. | |
1720 | * Virtual buffer could be spreaded across multiple pages... | |
1721 | */ | |
1722 | do { | |
1723 | if (iscsi_sendpage(conn, &mtask->sendbuf, | |
1724 | &mtask->data_count, &mtask->sent)) { | |
1725 | mtask->xmstate |= XMSTATE_IMM_DATA; | |
1726 | return -EAGAIN; | |
1727 | } | |
1728 | } while (mtask->data_count); | |
1729 | } | |
1730 | ||
1731 | BUG_ON(mtask->xmstate != XMSTATE_IDLE); | |
1732 | return 0; | |
1733 | } | |
1734 | ||
1735 | static inline int | |
1736 | handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1737 | { | |
1738 | ctask->xmstate &= ~XMSTATE_R_HDR; | |
af973481 MC |
1739 | if (conn->hdrdgst_en) |
1740 | iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext); | |
7ba24713 AA |
1741 | if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) { |
1742 | BUG_ON(ctask->xmstate != XMSTATE_IDLE); | |
1743 | return 0; /* wait for Data-In */ | |
1744 | } | |
1745 | ctask->xmstate |= XMSTATE_R_HDR; | |
1746 | return -EAGAIN; | |
1747 | } | |
1748 | ||
1749 | static inline int | |
1750 | handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1751 | { | |
1752 | ctask->xmstate &= ~XMSTATE_W_HDR; | |
af973481 MC |
1753 | if (conn->hdrdgst_en) |
1754 | iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext); | |
7ba24713 AA |
1755 | if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) { |
1756 | ctask->xmstate |= XMSTATE_W_HDR; | |
1757 | return -EAGAIN; | |
1758 | } | |
1759 | return 0; | |
1760 | } | |
1761 | ||
1762 | static inline int | |
1763 | handle_xmstate_data_digest(struct iscsi_conn *conn, | |
1764 | struct iscsi_cmd_task *ctask) | |
1765 | { | |
1766 | ctask->xmstate &= ~XMSTATE_DATA_DIGEST; | |
1767 | debug_tcp("resent data digest 0x%x\n", ctask->datadigest); | |
1768 | if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf, | |
1769 | &ctask->datadigest, 0)) { | |
1770 | ctask->xmstate |= XMSTATE_DATA_DIGEST; | |
1771 | debug_tcp("resent data digest 0x%x fail!\n", | |
1772 | ctask->datadigest); | |
1773 | return -EAGAIN; | |
1774 | } | |
1775 | return 0; | |
1776 | } | |
1777 | ||
1778 | static inline int | |
1779 | handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1780 | { | |
1781 | BUG_ON(!ctask->imm_count); | |
1782 | ctask->xmstate &= ~XMSTATE_IMM_DATA; | |
1783 | ||
1784 | if (conn->datadgst_en) { | |
1785 | iscsi_data_digest_init(conn, ctask); | |
1786 | ctask->immdigest = 0; | |
1787 | } | |
1788 | ||
1789 | for (;;) { | |
1790 | if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->imm_count, | |
1791 | &ctask->sent)) { | |
1792 | ctask->xmstate |= XMSTATE_IMM_DATA; | |
1793 | if (conn->datadgst_en) { | |
1794 | crypto_digest_final(conn->data_tx_tfm, | |
1795 | (u8*)&ctask->immdigest); | |
1796 | debug_tcp("tx imm sendpage fail 0x%x\n", | |
1797 | ctask->datadigest); | |
1798 | } | |
1799 | return -EAGAIN; | |
1800 | } | |
1801 | if (conn->datadgst_en) | |
1802 | iscsi_buf_data_digest_update(conn, &ctask->sendbuf); | |
1803 | ||
1804 | if (!ctask->imm_count) | |
1805 | break; | |
1806 | iscsi_buf_init_sg(&ctask->sendbuf, | |
1807 | &ctask->sg[ctask->sg_count++]); | |
1808 | } | |
1809 | ||
1810 | if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) { | |
1811 | if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf, | |
1812 | &ctask->immdigest, 1)) { | |
1813 | debug_tcp("sending imm digest 0x%x fail!\n", | |
1814 | ctask->immdigest); | |
1815 | return -EAGAIN; | |
1816 | } | |
1817 | debug_tcp("sending imm digest 0x%x\n", ctask->immdigest); | |
1818 | } | |
1819 | ||
1820 | return 0; | |
1821 | } | |
1822 | ||
1823 | static inline int | |
1824 | handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1825 | { | |
1826 | struct iscsi_data_task *dtask; | |
1827 | ||
1828 | ctask->xmstate |= XMSTATE_UNS_DATA; | |
1829 | if (ctask->xmstate & XMSTATE_UNS_INIT) { | |
1830 | iscsi_unsolicit_data_init(conn, ctask); | |
1831 | BUG_ON(!ctask->dtask); | |
1832 | dtask = ctask->dtask; | |
af973481 MC |
1833 | if (conn->hdrdgst_en) |
1834 | iscsi_hdr_digest(conn, &ctask->headbuf, | |
1835 | (u8*)dtask->hdrext); | |
7ba24713 AA |
1836 | ctask->xmstate &= ~XMSTATE_UNS_INIT; |
1837 | } | |
1838 | if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) { | |
1839 | ctask->xmstate &= ~XMSTATE_UNS_DATA; | |
1840 | ctask->xmstate |= XMSTATE_UNS_HDR; | |
1841 | return -EAGAIN; | |
1842 | } | |
1843 | ||
1844 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", | |
1845 | ctask->itt, ctask->unsol_count, ctask->sent); | |
1846 | return 0; | |
1847 | } | |
1848 | ||
1849 | static inline int | |
1850 | handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1851 | { | |
1852 | struct iscsi_data_task *dtask = ctask->dtask; | |
1853 | ||
1854 | BUG_ON(!ctask->data_count); | |
1855 | ctask->xmstate &= ~XMSTATE_UNS_DATA; | |
1856 | ||
1857 | if (conn->datadgst_en) { | |
1858 | iscsi_data_digest_init(conn, ctask); | |
1859 | dtask->digest = 0; | |
1860 | } | |
1861 | ||
1862 | for (;;) { | |
1863 | int start = ctask->sent; | |
1864 | ||
1865 | if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->data_count, | |
1866 | &ctask->sent)) { | |
1867 | ctask->unsol_count -= ctask->sent - start; | |
1868 | ctask->xmstate |= XMSTATE_UNS_DATA; | |
1869 | /* will continue with this ctask later.. */ | |
1870 | if (conn->datadgst_en) { | |
1871 | crypto_digest_final(conn->data_tx_tfm, | |
1872 | (u8 *)&dtask->digest); | |
1873 | debug_tcp("tx uns data fail 0x%x\n", | |
1874 | dtask->digest); | |
1875 | } | |
1876 | return -EAGAIN; | |
1877 | } | |
1878 | ||
1879 | BUG_ON(ctask->sent > ctask->total_length); | |
1880 | ctask->unsol_count -= ctask->sent - start; | |
1881 | ||
1882 | /* | |
1883 | * XXX:we may run here with un-initial sendbuf. | |
1884 | * so pass it | |
1885 | */ | |
1886 | if (conn->datadgst_en && ctask->sent - start > 0) | |
1887 | iscsi_buf_data_digest_update(conn, &ctask->sendbuf); | |
1888 | ||
1889 | if (!ctask->data_count) | |
1890 | break; | |
1891 | iscsi_buf_init_sg(&ctask->sendbuf, | |
1892 | &ctask->sg[ctask->sg_count++]); | |
1893 | } | |
1894 | BUG_ON(ctask->unsol_count < 0); | |
1895 | ||
1896 | /* | |
1897 | * Done with the Data-Out. Next, check if we need | |
1898 | * to send another unsolicited Data-Out. | |
1899 | */ | |
1900 | if (ctask->unsol_count) { | |
1901 | if (conn->datadgst_en) { | |
1902 | if (iscsi_digest_final_send(conn, ctask, | |
1903 | &dtask->digestbuf, | |
1904 | &dtask->digest, 1)) { | |
1905 | debug_tcp("send uns digest 0x%x fail\n", | |
1906 | dtask->digest); | |
1907 | return -EAGAIN; | |
1908 | } | |
1909 | debug_tcp("sending uns digest 0x%x, more uns\n", | |
1910 | dtask->digest); | |
1911 | } | |
1912 | ctask->xmstate |= XMSTATE_UNS_INIT; | |
1913 | return 1; | |
1914 | } | |
1915 | ||
1916 | if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) { | |
1917 | if (iscsi_digest_final_send(conn, ctask, | |
1918 | &dtask->digestbuf, | |
1919 | &dtask->digest, 1)) { | |
1920 | debug_tcp("send last uns digest 0x%x fail\n", | |
1921 | dtask->digest); | |
1922 | return -EAGAIN; | |
1923 | } | |
1924 | debug_tcp("sending uns digest 0x%x\n",dtask->digest); | |
1925 | } | |
1926 | ||
1927 | return 0; | |
1928 | } | |
1929 | ||
1930 | static inline int | |
1931 | handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1932 | { | |
1933 | struct iscsi_session *session = conn->session; | |
1934 | struct iscsi_r2t_info *r2t = ctask->r2t; | |
1935 | struct iscsi_data_task *dtask = r2t->dtask; | |
1936 | int left; | |
1937 | ||
1938 | ctask->xmstate &= ~XMSTATE_SOL_DATA; | |
1939 | ctask->dtask = dtask; | |
1940 | ||
1941 | if (conn->datadgst_en) { | |
1942 | iscsi_data_digest_init(conn, ctask); | |
1943 | dtask->digest = 0; | |
1944 | } | |
1945 | solicit_again: | |
1946 | /* | |
1947 | * send Data-Out whitnin this R2T sequence. | |
1948 | */ | |
1949 | if (!r2t->data_count) | |
1950 | goto data_out_done; | |
1951 | ||
1952 | if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) { | |
1953 | ctask->xmstate |= XMSTATE_SOL_DATA; | |
1954 | /* will continue with this ctask later.. */ | |
1955 | if (conn->datadgst_en) { | |
1956 | crypto_digest_final(conn->data_tx_tfm, | |
1957 | (u8 *)&dtask->digest); | |
1958 | debug_tcp("r2t data send fail 0x%x\n", dtask->digest); | |
1959 | } | |
1960 | return -EAGAIN; | |
1961 | } | |
1962 | ||
1963 | BUG_ON(r2t->data_count < 0); | |
1964 | if (conn->datadgst_en) | |
1965 | iscsi_buf_data_digest_update(conn, &r2t->sendbuf); | |
1966 | ||
1967 | if (r2t->data_count) { | |
1968 | BUG_ON(ctask->sc->use_sg == 0); | |
1969 | if (!iscsi_buf_left(&r2t->sendbuf)) { | |
1970 | BUG_ON(ctask->bad_sg == r2t->sg); | |
1971 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); | |
1972 | r2t->sg += 1; | |
1973 | } | |
1974 | goto solicit_again; | |
1975 | } | |
1976 | ||
1977 | data_out_done: | |
1978 | /* | |
1979 | * Done with this Data-Out. Next, check if we have | |
1980 | * to send another Data-Out for this R2T. | |
1981 | */ | |
1982 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1983 | left = r2t->data_length - r2t->sent; | |
1984 | if (left) { | |
1985 | if (conn->datadgst_en) { | |
1986 | if (iscsi_digest_final_send(conn, ctask, | |
1987 | &dtask->digestbuf, | |
1988 | &dtask->digest, 1)) { | |
1989 | debug_tcp("send r2t data digest 0x%x" | |
1990 | "fail\n", dtask->digest); | |
1991 | return -EAGAIN; | |
1992 | } | |
1993 | debug_tcp("r2t data send digest 0x%x\n", | |
1994 | dtask->digest); | |
1995 | } | |
1996 | iscsi_solicit_data_cont(conn, ctask, r2t, left); | |
1997 | ctask->xmstate |= XMSTATE_SOL_DATA; | |
1998 | ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
1999 | return 1; | |
2000 | } | |
2001 | ||
2002 | /* | |
2003 | * Done with this R2T. Check if there are more | |
2004 | * outstanding R2Ts ready to be processed. | |
2005 | */ | |
2006 | BUG_ON(ctask->r2t_data_count - r2t->data_length < 0); | |
2007 | if (conn->datadgst_en) { | |
2008 | if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, | |
2009 | &dtask->digest, 1)) { | |
2010 | debug_tcp("send last r2t data digest 0x%x" | |
2011 | "fail\n", dtask->digest); | |
2012 | return -EAGAIN; | |
2013 | } | |
2014 | debug_tcp("r2t done dout digest 0x%x\n", dtask->digest); | |
2015 | } | |
2016 | ||
2017 | ctask->r2t_data_count -= r2t->data_length; | |
2018 | ctask->r2t = NULL; | |
2019 | spin_lock_bh(&session->lock); | |
2020 | __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); | |
2021 | spin_unlock_bh(&session->lock); | |
2022 | if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { | |
2023 | ctask->r2t = r2t; | |
2024 | ctask->xmstate |= XMSTATE_SOL_DATA; | |
2025 | ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
2026 | return 1; | |
2027 | } | |
2028 | ||
2029 | return 0; | |
2030 | } | |
2031 | ||
2032 | static inline int | |
2033 | handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
2034 | { | |
2035 | struct iscsi_data_task *dtask = ctask->dtask; | |
2036 | int sent; | |
2037 | ||
2038 | ctask->xmstate &= ~XMSTATE_W_PAD; | |
2039 | iscsi_buf_init_virt(&ctask->sendbuf, (char*)&ctask->pad, | |
2040 | ctask->pad_count); | |
2041 | if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->pad_count, &sent)) { | |
2042 | ctask->xmstate |= XMSTATE_W_PAD; | |
2043 | return -EAGAIN; | |
2044 | } | |
2045 | ||
2046 | if (conn->datadgst_en) { | |
2047 | iscsi_buf_data_digest_update(conn, &ctask->sendbuf); | |
2048 | /* imm data? */ | |
2049 | if (!dtask) { | |
2050 | if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf, | |
2051 | &ctask->immdigest, 1)) { | |
2052 | debug_tcp("send padding digest 0x%x" | |
2053 | "fail!\n", ctask->immdigest); | |
2054 | return -EAGAIN; | |
2055 | } | |
2056 | debug_tcp("done with padding, digest 0x%x\n", | |
2057 | ctask->datadigest); | |
2058 | } else { | |
2059 | if (iscsi_digest_final_send(conn, ctask, | |
2060 | &dtask->digestbuf, | |
2061 | &dtask->digest, 1)) { | |
2062 | debug_tcp("send padding digest 0x%x" | |
2063 | "fail\n", dtask->digest); | |
2064 | return -EAGAIN; | |
2065 | } | |
2066 | debug_tcp("done with padding, digest 0x%x\n", | |
2067 | dtask->digest); | |
2068 | } | |
2069 | } | |
2070 | ||
2071 | return 0; | |
2072 | } | |
2073 | ||
2074 | static int | |
2075 | iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
2076 | { | |
2077 | int rc = 0; | |
2078 | ||
2079 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", | |
2080 | conn->id, ctask->xmstate, ctask->itt); | |
2081 | ||
2082 | /* | |
2083 | * serialize with TMF AbortTask | |
2084 | */ | |
2085 | if (ctask->mtask) | |
2086 | return rc; | |
2087 | ||
2088 | if (ctask->xmstate & XMSTATE_R_HDR) { | |
2089 | rc = handle_xmstate_r_hdr(conn, ctask); | |
2090 | return rc; | |
2091 | } | |
2092 | ||
2093 | if (ctask->xmstate & XMSTATE_W_HDR) { | |
2094 | rc = handle_xmstate_w_hdr(conn, ctask); | |
2095 | if (rc) | |
2096 | return rc; | |
2097 | } | |
2098 | ||
2099 | /* XXX: for data digest xmit recover */ | |
2100 | if (ctask->xmstate & XMSTATE_DATA_DIGEST) { | |
2101 | rc = handle_xmstate_data_digest(conn, ctask); | |
2102 | if (rc) | |
2103 | return rc; | |
2104 | } | |
2105 | ||
2106 | if (ctask->xmstate & XMSTATE_IMM_DATA) { | |
2107 | rc = handle_xmstate_imm_data(conn, ctask); | |
2108 | if (rc) | |
2109 | return rc; | |
2110 | } | |
2111 | ||
2112 | if (ctask->xmstate & XMSTATE_UNS_HDR) { | |
2113 | BUG_ON(!ctask->unsol_count); | |
2114 | ctask->xmstate &= ~XMSTATE_UNS_HDR; | |
2115 | unsolicit_head_again: | |
2116 | rc = handle_xmstate_uns_hdr(conn, ctask); | |
2117 | if (rc) | |
2118 | return rc; | |
2119 | } | |
2120 | ||
2121 | if (ctask->xmstate & XMSTATE_UNS_DATA) { | |
2122 | rc = handle_xmstate_uns_data(conn, ctask); | |
2123 | if (rc == 1) | |
2124 | goto unsolicit_head_again; | |
2125 | else if (rc) | |
2126 | return rc; | |
2127 | goto done; | |
2128 | } | |
2129 | ||
2130 | if (ctask->xmstate & XMSTATE_SOL_HDR) { | |
2131 | struct iscsi_r2t_info *r2t; | |
2132 | ||
2133 | ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
2134 | ctask->xmstate |= XMSTATE_SOL_DATA; | |
2135 | if (!ctask->r2t) | |
2136 | __kfifo_get(ctask->r2tqueue, (void*)&ctask->r2t, | |
2137 | sizeof(void*)); | |
2138 | solicit_head_again: | |
2139 | r2t = ctask->r2t; | |
af973481 MC |
2140 | if (conn->hdrdgst_en) |
2141 | iscsi_hdr_digest(conn, &r2t->headbuf, | |
2142 | (u8*)r2t->dtask->hdrext); | |
7ba24713 AA |
2143 | if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) { |
2144 | ctask->xmstate &= ~XMSTATE_SOL_DATA; | |
2145 | ctask->xmstate |= XMSTATE_SOL_HDR; | |
2146 | return -EAGAIN; | |
2147 | } | |
2148 | ||
2149 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", | |
2150 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, | |
2151 | r2t->sent); | |
2152 | } | |
2153 | ||
2154 | if (ctask->xmstate & XMSTATE_SOL_DATA) { | |
2155 | rc = handle_xmstate_sol_data(conn, ctask); | |
2156 | if (rc == 1) | |
2157 | goto solicit_head_again; | |
2158 | if (rc) | |
2159 | return rc; | |
2160 | } | |
2161 | ||
2162 | done: | |
2163 | /* | |
2164 | * Last thing to check is whether we need to send write | |
2165 | * padding. Note that we check for xmstate equality, not just the bit. | |
2166 | */ | |
2167 | if (ctask->xmstate == XMSTATE_W_PAD) | |
2168 | rc = handle_xmstate_w_pad(conn, ctask); | |
2169 | ||
2170 | return rc; | |
2171 | } | |
2172 | ||
2173 | /** | |
2174 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
2175 | * @conn: iscsi connection | |
2176 | * | |
2177 | * Notes: | |
2178 | * The function can return -EAGAIN in which case the caller must | |
2179 | * re-schedule it again later or recover. '0' return code means | |
2180 | * successful xmit. | |
2181 | **/ | |
2182 | static int | |
2183 | iscsi_data_xmit(struct iscsi_conn *conn) | |
2184 | { | |
2185 | if (unlikely(conn->suspend_tx)) { | |
2186 | debug_tcp("conn %d Tx suspended!\n", conn->id); | |
2187 | return 0; | |
2188 | } | |
2189 | ||
2190 | /* | |
2191 | * Transmit in the following order: | |
2192 | * | |
2193 | * 1) un-finished xmit (ctask or mtask) | |
2194 | * 2) immediate control PDUs | |
2195 | * 3) write data | |
2196 | * 4) SCSI commands | |
2197 | * 5) non-immediate control PDUs | |
2198 | * | |
2199 | * No need to lock around __kfifo_get as long as | |
2200 | * there's one producer and one consumer. | |
2201 | */ | |
2202 | ||
2203 | BUG_ON(conn->ctask && conn->mtask); | |
2204 | ||
2205 | if (conn->ctask) { | |
2206 | if (iscsi_ctask_xmit(conn, conn->ctask)) | |
2207 | goto again; | |
2208 | /* done with this in-progress ctask */ | |
2209 | conn->ctask = NULL; | |
2210 | } | |
2211 | if (conn->mtask) { | |
2212 | if (iscsi_mtask_xmit(conn, conn->mtask)) | |
2213 | goto again; | |
2214 | /* done with this in-progress mtask */ | |
2215 | conn->mtask = NULL; | |
2216 | } | |
2217 | ||
2218 | /* process immediate first */ | |
2219 | if (unlikely(__kfifo_len(conn->immqueue))) { | |
2220 | struct iscsi_session *session = conn->session; | |
2221 | while (__kfifo_get(conn->immqueue, (void*)&conn->mtask, | |
2222 | sizeof(void*))) { | |
2223 | if (iscsi_mtask_xmit(conn, conn->mtask)) | |
2224 | goto again; | |
2225 | ||
2226 | if (conn->mtask->hdr.itt == | |
2227 | cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
2228 | spin_lock_bh(&session->lock); | |
2229 | __kfifo_put(session->mgmtpool.queue, | |
2230 | (void*)&conn->mtask, sizeof(void*)); | |
2231 | spin_unlock_bh(&session->lock); | |
2232 | } | |
2233 | } | |
2234 | /* done with this mtask */ | |
2235 | conn->mtask = NULL; | |
2236 | } | |
2237 | ||
2238 | /* process write queue */ | |
2239 | while (__kfifo_get(conn->writequeue, (void*)&conn->ctask, | |
2240 | sizeof(void*))) { | |
2241 | if (iscsi_ctask_xmit(conn, conn->ctask)) | |
2242 | goto again; | |
2243 | } | |
2244 | ||
2245 | /* process command queue */ | |
2246 | while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask, | |
2247 | sizeof(void*))) { | |
2248 | if (iscsi_ctask_xmit(conn, conn->ctask)) | |
2249 | goto again; | |
2250 | } | |
2251 | /* done with this ctask */ | |
2252 | conn->ctask = NULL; | |
2253 | ||
2254 | /* process the rest control plane PDUs, if any */ | |
2255 | if (unlikely(__kfifo_len(conn->mgmtqueue))) { | |
2256 | struct iscsi_session *session = conn->session; | |
2257 | ||
2258 | while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, | |
2259 | sizeof(void*))) { | |
2260 | if (iscsi_mtask_xmit(conn, conn->mtask)) | |
2261 | goto again; | |
2262 | ||
2263 | if (conn->mtask->hdr.itt == | |
2264 | cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
2265 | spin_lock_bh(&session->lock); | |
2266 | __kfifo_put(session->mgmtpool.queue, | |
2267 | (void*)&conn->mtask, | |
2268 | sizeof(void*)); | |
2269 | spin_unlock_bh(&session->lock); | |
2270 | } | |
2271 | } | |
2272 | /* done with this mtask */ | |
2273 | conn->mtask = NULL; | |
2274 | } | |
2275 | ||
2276 | return 0; | |
2277 | ||
2278 | again: | |
2279 | if (unlikely(conn->suspend_tx)) | |
2280 | return 0; | |
2281 | ||
2282 | return -EAGAIN; | |
2283 | } | |
2284 | ||
2285 | static void | |
2286 | iscsi_xmitworker(void *data) | |
2287 | { | |
2288 | struct iscsi_conn *conn = data; | |
2289 | ||
2290 | /* | |
2291 | * serialize Xmit worker on a per-connection basis. | |
2292 | */ | |
2293 | down(&conn->xmitsema); | |
2294 | if (iscsi_data_xmit(conn)) | |
2295 | schedule_work(&conn->xmitwork); | |
2296 | up(&conn->xmitsema); | |
2297 | } | |
2298 | ||
2299 | #define FAILURE_BAD_HOST 1 | |
2300 | #define FAILURE_SESSION_FAILED 2 | |
2301 | #define FAILURE_SESSION_FREED 3 | |
2302 | #define FAILURE_WINDOW_CLOSED 4 | |
2303 | #define FAILURE_SESSION_TERMINATE 5 | |
2304 | ||
2305 | static int | |
2306 | iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
2307 | { | |
2308 | struct Scsi_Host *host; | |
2309 | int reason = 0; | |
2310 | struct iscsi_session *session; | |
2311 | struct iscsi_conn *conn = NULL; | |
2312 | struct iscsi_cmd_task *ctask = NULL; | |
2313 | ||
2314 | sc->scsi_done = done; | |
2315 | sc->result = 0; | |
2316 | ||
2317 | host = sc->device->host; | |
2318 | session = iscsi_hostdata(host->hostdata); | |
2319 | BUG_ON(host != session->host); | |
2320 | ||
2321 | spin_lock(&session->lock); | |
2322 | ||
2323 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
2324 | if (session->state == ISCSI_STATE_FAILED) { | |
2325 | reason = FAILURE_SESSION_FAILED; | |
2326 | goto reject; | |
2327 | } else if (session->state == ISCSI_STATE_TERMINATE) { | |
2328 | reason = FAILURE_SESSION_TERMINATE; | |
2329 | goto fault; | |
2330 | } | |
2331 | reason = FAILURE_SESSION_FREED; | |
2332 | goto fault; | |
2333 | } | |
2334 | ||
2335 | /* | |
2336 | * Check for iSCSI window and take care of CmdSN wrap-around | |
2337 | */ | |
2338 | if ((int)(session->max_cmdsn - session->cmdsn) < 0) { | |
2339 | reason = FAILURE_WINDOW_CLOSED; | |
2340 | goto reject; | |
2341 | } | |
2342 | ||
2343 | conn = session->leadconn; | |
2344 | ||
2345 | __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); | |
2346 | BUG_ON(ctask->sc); | |
2347 | ||
2348 | sc->SCp.phase = session->age; | |
2349 | sc->SCp.ptr = (char*)ctask; | |
2350 | iscsi_cmd_init(conn, ctask, sc); | |
2351 | ||
2352 | __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*)); | |
2353 | debug_scsi( | |
2354 | "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n", | |
2355 | sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", | |
2356 | conn->id, (long)sc, ctask->itt, sc->request_bufflen, | |
2357 | session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); | |
2358 | spin_unlock(&session->lock); | |
2359 | ||
2360 | if (!in_interrupt() && !down_trylock(&conn->xmitsema)) { | |
2361 | spin_unlock_irq(host->host_lock); | |
2362 | if (iscsi_data_xmit(conn)) | |
2363 | schedule_work(&conn->xmitwork); | |
2364 | up(&conn->xmitsema); | |
2365 | spin_lock_irq(host->host_lock); | |
2366 | } else | |
2367 | schedule_work(&conn->xmitwork); | |
2368 | ||
2369 | return 0; | |
2370 | ||
2371 | reject: | |
2372 | spin_unlock(&session->lock); | |
2373 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); | |
2374 | return SCSI_MLQUEUE_HOST_BUSY; | |
2375 | ||
2376 | fault: | |
2377 | spin_unlock(&session->lock); | |
2378 | printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n", | |
2379 | sc->cmnd[0], reason); | |
2380 | sc->sense_buffer[0] = 0x70; | |
2381 | sc->sense_buffer[2] = NOT_READY; | |
2382 | sc->sense_buffer[7] = 0x6; | |
2383 | sc->sense_buffer[12] = 0x08; | |
2384 | sc->sense_buffer[13] = 0x00; | |
2385 | sc->result = (DID_NO_CONNECT << 16); | |
2386 | sc->resid = sc->request_bufflen; | |
2387 | sc->scsi_done(sc); | |
2388 | return 0; | |
2389 | } | |
2390 | ||
2391 | static int | |
2392 | iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) | |
2393 | { | |
2394 | int i; | |
2395 | ||
2396 | *items = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
2397 | if (*items == NULL) | |
2398 | return -ENOMEM; | |
2399 | ||
2400 | q->max = max; | |
2401 | q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
2402 | if (q->pool == NULL) { | |
2403 | kfree(*items); | |
2404 | return -ENOMEM; | |
2405 | } | |
2406 | ||
2407 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
2408 | GFP_KERNEL, NULL); | |
2409 | if (q->queue == ERR_PTR(-ENOMEM)) { | |
2410 | kfree(q->pool); | |
2411 | kfree(*items); | |
2412 | return -ENOMEM; | |
2413 | } | |
2414 | ||
2415 | for (i = 0; i < max; i++) { | |
2416 | q->pool[i] = kmalloc(item_size, GFP_KERNEL); | |
2417 | if (q->pool[i] == NULL) { | |
2418 | int j; | |
2419 | ||
2420 | for (j = 0; j < i; j++) | |
2421 | kfree(q->pool[j]); | |
2422 | ||
2423 | kfifo_free(q->queue); | |
2424 | kfree(q->pool); | |
2425 | kfree(*items); | |
2426 | return -ENOMEM; | |
2427 | } | |
2428 | memset(q->pool[i], 0, item_size); | |
2429 | (*items)[i] = q->pool[i]; | |
2430 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); | |
2431 | } | |
2432 | return 0; | |
2433 | } | |
2434 | ||
2435 | static void | |
2436 | iscsi_pool_free(struct iscsi_queue *q, void **items) | |
2437 | { | |
2438 | int i; | |
2439 | ||
2440 | for (i = 0; i < q->max; i++) | |
2441 | kfree(items[i]); | |
2442 | kfree(q->pool); | |
2443 | kfree(items); | |
2444 | } | |
2445 | ||
2446 | static iscsi_connh_t | |
2447 | iscsi_conn_create(iscsi_sessionh_t sessionh, uint32_t conn_idx) | |
2448 | { | |
2449 | struct iscsi_session *session = iscsi_ptr(sessionh); | |
2450 | struct iscsi_conn *conn = NULL; | |
2451 | ||
2452 | conn = kmalloc(sizeof(struct iscsi_conn), GFP_KERNEL); | |
2453 | if (conn == NULL) | |
2454 | goto conn_alloc_fail; | |
2455 | memset(conn, 0, sizeof(struct iscsi_conn)); | |
2456 | ||
2457 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2458 | conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
2459 | conn->id = conn_idx; | |
2460 | conn->exp_statsn = 0; | |
2461 | conn->tmabort_state = TMABORT_INITIAL; | |
2462 | ||
2463 | /* initial operational parameters */ | |
2464 | conn->hdr_size = sizeof(struct iscsi_hdr); | |
2465 | conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; | |
2466 | conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; | |
2467 | ||
2468 | spin_lock_init(&conn->lock); | |
2469 | ||
2470 | /* initialize general xmit PDU commands queue */ | |
2471 | conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*), | |
2472 | GFP_KERNEL, NULL); | |
2473 | if (conn->xmitqueue == ERR_PTR(-ENOMEM)) | |
2474 | goto xmitqueue_alloc_fail; | |
2475 | ||
2476 | /* initialize write response PDU commands queue */ | |
2477 | conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*), | |
2478 | GFP_KERNEL, NULL); | |
2479 | if (conn->writequeue == ERR_PTR(-ENOMEM)) | |
2480 | goto writequeue_alloc_fail; | |
2481 | ||
2482 | /* initialize general immediate & non-immediate PDU commands queue */ | |
2483 | conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), | |
2484 | GFP_KERNEL, NULL); | |
2485 | if (conn->immqueue == ERR_PTR(-ENOMEM)) | |
2486 | goto immqueue_alloc_fail; | |
2487 | ||
2488 | conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), | |
2489 | GFP_KERNEL, NULL); | |
2490 | if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) | |
2491 | goto mgmtqueue_alloc_fail; | |
2492 | ||
2493 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn); | |
2494 | ||
2495 | /* allocate login_mtask used for the login/text sequences */ | |
2496 | spin_lock_bh(&session->lock); | |
2497 | if (!__kfifo_get(session->mgmtpool.queue, | |
2498 | (void*)&conn->login_mtask, | |
2499 | sizeof(void*))) { | |
2500 | spin_unlock_bh(&session->lock); | |
2501 | goto login_mtask_alloc_fail; | |
2502 | } | |
2503 | spin_unlock_bh(&session->lock); | |
2504 | ||
2505 | /* allocate initial PDU receive place holder */ | |
2506 | if (conn->data_size <= PAGE_SIZE) | |
2507 | conn->data = kmalloc(conn->data_size, GFP_KERNEL); | |
2508 | else | |
2509 | conn->data = (void*)__get_free_pages(GFP_KERNEL, | |
2510 | get_order(conn->data_size)); | |
2511 | if (!conn->data) | |
2512 | goto max_recv_dlenght_alloc_fail; | |
2513 | ||
2514 | init_timer(&conn->tmabort_timer); | |
2515 | init_MUTEX(&conn->xmitsema); | |
2516 | init_waitqueue_head(&conn->ehwait); | |
2517 | ||
2518 | return iscsi_handle(conn); | |
2519 | ||
2520 | max_recv_dlenght_alloc_fail: | |
2521 | spin_lock_bh(&session->lock); | |
2522 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, | |
2523 | sizeof(void*)); | |
2524 | spin_unlock_bh(&session->lock); | |
2525 | login_mtask_alloc_fail: | |
2526 | kfifo_free(conn->mgmtqueue); | |
2527 | mgmtqueue_alloc_fail: | |
2528 | kfifo_free(conn->immqueue); | |
2529 | immqueue_alloc_fail: | |
2530 | kfifo_free(conn->writequeue); | |
2531 | writequeue_alloc_fail: | |
2532 | kfifo_free(conn->xmitqueue); | |
2533 | xmitqueue_alloc_fail: | |
2534 | kfree(conn); | |
2535 | conn_alloc_fail: | |
2536 | return iscsi_handle(NULL); | |
2537 | } | |
2538 | ||
2539 | static void | |
2540 | iscsi_conn_destroy(iscsi_connh_t connh) | |
2541 | { | |
2542 | struct iscsi_conn *conn = iscsi_ptr(connh); | |
2543 | struct iscsi_session *session = conn->session; | |
2544 | ||
2545 | down(&conn->xmitsema); | |
2546 | set_bit(SUSPEND_BIT, &conn->suspend_tx); | |
2547 | if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE && conn->sock) { | |
2548 | struct sock *sk = conn->sock->sk; | |
2549 | ||
2550 | /* | |
2551 | * conn_start() has never been called! | |
2552 | * need to cleanup the socket. | |
2553 | */ | |
2554 | write_lock_bh(&sk->sk_callback_lock); | |
2555 | set_bit(SUSPEND_BIT, &conn->suspend_rx); | |
2556 | write_unlock_bh(&sk->sk_callback_lock); | |
2557 | ||
2558 | sock_hold(conn->sock->sk); | |
2559 | iscsi_conn_restore_callbacks(conn); | |
2560 | sock_put(conn->sock->sk); | |
2561 | sock_release(conn->sock); | |
2562 | conn->sock = NULL; | |
2563 | } | |
2564 | ||
2565 | spin_lock_bh(&session->lock); | |
2566 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2567 | if (session->leadconn == conn) { | |
2568 | /* | |
2569 | * leading connection? then give up on recovery. | |
2570 | */ | |
2571 | session->state = ISCSI_STATE_TERMINATE; | |
2572 | wake_up(&conn->ehwait); | |
2573 | } | |
2574 | spin_unlock_bh(&session->lock); | |
2575 | ||
2576 | up(&conn->xmitsema); | |
2577 | ||
2578 | /* | |
2579 | * Block until all in-progress commands for this connection | |
2580 | * time out or fail. | |
2581 | */ | |
2582 | for (;;) { | |
2583 | spin_lock_bh(&conn->lock); | |
2584 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2585 | spin_unlock_bh(&conn->lock); | |
2586 | break; | |
2587 | } | |
2588 | spin_unlock_bh(&conn->lock); | |
2589 | msleep_interruptible(500); | |
2590 | printk("conn_destroy(): host_busy %d host_failed %d\n", | |
2591 | session->host->host_busy, session->host->host_failed); | |
2592 | /* | |
2593 | * force eh_abort() to unblock | |
2594 | */ | |
2595 | wake_up(&conn->ehwait); | |
2596 | } | |
2597 | ||
2598 | /* now free crypto */ | |
2599 | if (conn->hdrdgst_en || conn->datadgst_en) { | |
2600 | if (conn->tx_tfm) | |
2601 | crypto_free_tfm(conn->tx_tfm); | |
2602 | if (conn->rx_tfm) | |
2603 | crypto_free_tfm(conn->rx_tfm); | |
2604 | if (conn->data_tx_tfm) | |
2605 | crypto_free_tfm(conn->data_tx_tfm); | |
2606 | if (conn->data_rx_tfm) | |
2607 | crypto_free_tfm(conn->data_rx_tfm); | |
2608 | } | |
2609 | ||
2610 | /* free conn->data, size = MaxRecvDataSegmentLength */ | |
2611 | if (conn->data_size <= PAGE_SIZE) | |
2612 | kfree(conn->data); | |
2613 | else | |
2614 | free_pages((unsigned long)conn->data, | |
2615 | get_order(conn->data_size)); | |
2616 | ||
2617 | spin_lock_bh(&session->lock); | |
2618 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, | |
2619 | sizeof(void*)); | |
2620 | list_del(&conn->item); | |
2621 | if (list_empty(&session->connections)) | |
2622 | session->leadconn = NULL; | |
2623 | if (session->leadconn && session->leadconn == conn) | |
2624 | session->leadconn = container_of(session->connections.next, | |
2625 | struct iscsi_conn, item); | |
2626 | ||
2627 | if (session->leadconn == NULL) | |
2628 | /* none connections exits.. reset sequencing */ | |
2629 | session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; | |
2630 | spin_unlock_bh(&session->lock); | |
2631 | ||
2632 | kfifo_free(conn->xmitqueue); | |
2633 | kfifo_free(conn->writequeue); | |
2634 | kfifo_free(conn->immqueue); | |
2635 | kfifo_free(conn->mgmtqueue); | |
2636 | kfree(conn); | |
2637 | } | |
2638 | ||
2639 | static int | |
2640 | iscsi_conn_bind(iscsi_sessionh_t sessionh, iscsi_connh_t connh, | |
2641 | uint32_t transport_fd, int is_leading) | |
2642 | { | |
2643 | struct iscsi_session *session = iscsi_ptr(sessionh); | |
2644 | struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = iscsi_ptr(connh); | |
2645 | struct sock *sk; | |
2646 | struct socket *sock; | |
2647 | int err; | |
2648 | ||
2649 | /* lookup for existing socket */ | |
2650 | sock = sockfd_lookup(transport_fd, &err); | |
2651 | if (!sock) { | |
2652 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); | |
2653 | return -EEXIST; | |
2654 | } | |
2655 | ||
2656 | /* lookup for existing connection */ | |
2657 | spin_lock_bh(&session->lock); | |
2658 | list_for_each_entry(tmp, &session->connections, item) { | |
2659 | if (tmp == conn) { | |
2660 | if (conn->c_stage != ISCSI_CONN_STOPPED || | |
2661 | conn->stop_stage == STOP_CONN_TERM) { | |
2662 | printk(KERN_ERR "iscsi_tcp: can't bind " | |
2663 | "non-stopped connection (%d:%d)\n", | |
2664 | conn->c_stage, conn->stop_stage); | |
2665 | spin_unlock_bh(&session->lock); | |
2666 | return -EIO; | |
2667 | } | |
2668 | break; | |
2669 | } | |
2670 | } | |
2671 | if (tmp != conn) { | |
2672 | /* bind new iSCSI connection to session */ | |
2673 | conn->session = session; | |
2674 | ||
2675 | list_add(&conn->item, &session->connections); | |
2676 | } | |
2677 | spin_unlock_bh(&session->lock); | |
2678 | ||
2679 | if (conn->stop_stage != STOP_CONN_SUSPEND) { | |
2680 | /* bind iSCSI connection and socket */ | |
2681 | conn->sock = sock; | |
2682 | ||
2683 | /* setup Socket parameters */ | |
2684 | sk = sock->sk; | |
2685 | sk->sk_reuse = 1; | |
2686 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
2687 | sk->sk_allocation = GFP_ATOMIC; | |
2688 | ||
2689 | /* FIXME: disable Nagle's algorithm */ | |
2690 | ||
2691 | /* | |
2692 | * Intercept TCP callbacks for sendfile like receive | |
2693 | * processing. | |
2694 | */ | |
2695 | iscsi_conn_set_callbacks(conn); | |
2696 | ||
2697 | /* | |
2698 | * set receive state machine into initial state | |
2699 | */ | |
2700 | conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
2701 | } | |
2702 | ||
2703 | if (is_leading) | |
2704 | session->leadconn = conn; | |
2705 | ||
2706 | /* | |
2707 | * Unblock xmitworker(), Login Phase will pass through. | |
2708 | */ | |
2709 | clear_bit(SUSPEND_BIT, &conn->suspend_rx); | |
2710 | clear_bit(SUSPEND_BIT, &conn->suspend_tx); | |
2711 | ||
2712 | return 0; | |
2713 | } | |
2714 | ||
2715 | static int | |
2716 | iscsi_conn_start(iscsi_connh_t connh) | |
2717 | { | |
2718 | struct iscsi_conn *conn = iscsi_ptr(connh); | |
2719 | struct iscsi_session *session = conn->session; | |
2720 | struct sock *sk; | |
2721 | ||
2722 | /* FF phase warming up... */ | |
2723 | ||
2724 | if (session == NULL) { | |
2725 | printk(KERN_ERR "iscsi_tcp: can't start unbound connection\n"); | |
2726 | return -EPERM; | |
2727 | } | |
2728 | ||
2729 | sk = conn->sock->sk; | |
2730 | ||
2731 | write_lock_bh(&sk->sk_callback_lock); | |
2732 | spin_lock_bh(&session->lock); | |
2733 | conn->c_stage = ISCSI_CONN_STARTED; | |
2734 | session->state = ISCSI_STATE_LOGGED_IN; | |
2735 | ||
2736 | switch(conn->stop_stage) { | |
2737 | case STOP_CONN_RECOVER: | |
2738 | /* | |
2739 | * unblock eh_abort() if it is blocked. re-try all | |
2740 | * commands after successful recovery | |
2741 | */ | |
2742 | session->conn_cnt++; | |
2743 | conn->stop_stage = 0; | |
2744 | conn->tmabort_state = TMABORT_INITIAL; | |
2745 | session->age++; | |
2746 | wake_up(&conn->ehwait); | |
2747 | break; | |
2748 | case STOP_CONN_TERM: | |
2749 | session->conn_cnt++; | |
2750 | conn->stop_stage = 0; | |
2751 | break; | |
2752 | case STOP_CONN_SUSPEND: | |
2753 | conn->stop_stage = 0; | |
2754 | clear_bit(SUSPEND_BIT, &conn->suspend_rx); | |
2755 | clear_bit(SUSPEND_BIT, &conn->suspend_tx); | |
2756 | break; | |
2757 | default: | |
2758 | break; | |
2759 | } | |
2760 | spin_unlock_bh(&session->lock); | |
2761 | write_unlock_bh(&sk->sk_callback_lock); | |
2762 | ||
2763 | return 0; | |
2764 | } | |
2765 | ||
2766 | static void | |
2767 | iscsi_conn_stop(iscsi_connh_t connh, int flag) | |
2768 | { | |
2769 | struct iscsi_conn *conn = iscsi_ptr(connh); | |
2770 | struct iscsi_session *session = conn->session; | |
2771 | struct sock *sk; | |
2772 | unsigned long flags; | |
2773 | ||
2774 | BUG_ON(!conn->sock); | |
2775 | sk = conn->sock->sk; | |
2776 | write_lock_bh(&sk->sk_callback_lock); | |
2777 | set_bit(SUSPEND_BIT, &conn->suspend_rx); | |
2778 | write_unlock_bh(&sk->sk_callback_lock); | |
2779 | ||
2780 | down(&conn->xmitsema); | |
2781 | ||
2782 | spin_lock_irqsave(session->host->host_lock, flags); | |
2783 | spin_lock(&session->lock); | |
2784 | conn->stop_stage = flag; | |
2785 | conn->c_stage = ISCSI_CONN_STOPPED; | |
2786 | set_bit(SUSPEND_BIT, &conn->suspend_tx); | |
2787 | ||
2788 | if (flag != STOP_CONN_SUSPEND) | |
2789 | session->conn_cnt--; | |
2790 | ||
2791 | if (session->conn_cnt == 0 || session->leadconn == conn) | |
2792 | session->state = ISCSI_STATE_FAILED; | |
2793 | ||
2794 | spin_unlock(&session->lock); | |
2795 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2796 | ||
2797 | if (flag == STOP_CONN_TERM || flag == STOP_CONN_RECOVER) { | |
2798 | struct iscsi_cmd_task *ctask; | |
2799 | struct iscsi_mgmt_task *mtask; | |
2800 | ||
2801 | /* | |
2802 | * Socket must go now. | |
2803 | */ | |
2804 | sock_hold(conn->sock->sk); | |
2805 | iscsi_conn_restore_callbacks(conn); | |
2806 | sock_put(conn->sock->sk); | |
2807 | ||
2808 | /* | |
2809 | * flush xmit queues. | |
2810 | */ | |
2811 | spin_lock_bh(&session->lock); | |
2812 | while (__kfifo_get(conn->writequeue, (void*)&ctask, | |
2813 | sizeof(void*)) || | |
2814 | __kfifo_get(conn->xmitqueue, (void*)&ctask, | |
2815 | sizeof(void*))) { | |
2816 | struct iscsi_r2t_info *r2t; | |
2817 | ||
2818 | /* | |
2819 | * flush ctask's r2t queues | |
2820 | */ | |
2821 | while (__kfifo_get(ctask->r2tqueue, (void*)&r2t, | |
2822 | sizeof(void*))) | |
2823 | __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, | |
2824 | sizeof(void*)); | |
2825 | ||
2826 | spin_unlock_bh(&session->lock); | |
2827 | local_bh_disable(); | |
2828 | iscsi_ctask_cleanup(conn, ctask); | |
2829 | local_bh_enable(); | |
2830 | spin_lock_bh(&session->lock); | |
2831 | } | |
2832 | conn->ctask = NULL; | |
2833 | while (__kfifo_get(conn->immqueue, (void*)&mtask, | |
2834 | sizeof(void*)) || | |
2835 | __kfifo_get(conn->mgmtqueue, (void*)&mtask, | |
2836 | sizeof(void*))) { | |
2837 | __kfifo_put(session->mgmtpool.queue, | |
2838 | (void*)&mtask, sizeof(void*)); | |
2839 | } | |
2840 | conn->mtask = NULL; | |
2841 | spin_unlock_bh(&session->lock); | |
2842 | ||
2843 | /* | |
2844 | * release socket only after we stopped data_xmit() | |
2845 | * activity and flushed all outstandings | |
2846 | */ | |
2847 | sock_release(conn->sock); | |
2848 | conn->sock = NULL; | |
2849 | ||
2850 | /* | |
2851 | * for connection level recovery we should not calculate | |
2852 | * header digest. conn->hdr_size used for optimization | |
2853 | * in hdr_extract() and will be re-negotiated at | |
2854 | * set_param() time. | |
2855 | */ | |
2856 | if (flag == STOP_CONN_RECOVER) | |
2857 | conn->hdr_size = sizeof(struct iscsi_hdr); | |
2858 | } | |
2859 | up(&conn->xmitsema); | |
2860 | } | |
2861 | ||
2862 | static int | |
2863 | iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
2864 | char *data, uint32_t data_size) | |
2865 | { | |
2866 | struct iscsi_session *session = conn->session; | |
2867 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; | |
2868 | struct iscsi_mgmt_task *mtask; | |
2869 | ||
2870 | spin_lock_bh(&session->lock); | |
2871 | if (session->state == ISCSI_STATE_TERMINATE) { | |
2872 | spin_unlock_bh(&session->lock); | |
2873 | return -EPERM; | |
2874 | } | |
2875 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
2876 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
2877 | /* | |
2878 | * Login and Text are sent serially, in | |
2879 | * request-followed-by-response sequence. | |
2880 | * Same mtask can be used. Same ITT must be used. | |
2881 | * Note that login_mtask is preallocated at conn_create(). | |
2882 | */ | |
2883 | mtask = conn->login_mtask; | |
2884 | else { | |
2885 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); | |
2886 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
2887 | ||
2888 | if (!__kfifo_get(session->mgmtpool.queue, | |
2889 | (void*)&mtask, sizeof(void*))) { | |
2890 | spin_unlock_bh(&session->lock); | |
2891 | return -ENOSPC; | |
2892 | } | |
2893 | } | |
2894 | ||
2895 | /* | |
2896 | * pre-format CmdSN and ExpStatSN for outgoing PDU. | |
2897 | */ | |
2898 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
2899 | hdr->itt = mtask->itt | (conn->id << CID_SHIFT) | | |
2900 | (session->age << AGE_SHIFT); | |
2901 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
2902 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
2903 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) | |
2904 | session->cmdsn++; | |
2905 | } else | |
2906 | /* do not advance CmdSN */ | |
2907 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
2908 | ||
2909 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
2910 | ||
2911 | memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr)); | |
2912 | ||
af973481 | 2913 | iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr, |
7ba24713 | 2914 | sizeof(struct iscsi_hdr)); |
7ba24713 AA |
2915 | |
2916 | spin_unlock_bh(&session->lock); | |
2917 | ||
2918 | if (data_size) { | |
2919 | memcpy(mtask->data, data, data_size); | |
2920 | mtask->data_count = data_size; | |
2921 | } else | |
2922 | mtask->data_count = 0; | |
2923 | ||
2924 | mtask->xmstate = XMSTATE_IMM_HDR; | |
2925 | ||
2926 | if (mtask->data_count) { | |
2927 | iscsi_buf_init_iov(&mtask->sendbuf, (char*)mtask->data, | |
2928 | mtask->data_count); | |
2929 | } | |
2930 | ||
2931 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", | |
2932 | hdr->opcode, hdr->itt, data_size); | |
2933 | ||
2934 | /* | |
2935 | * since send_pdu() could be called at least from two contexts, | |
2936 | * we need to serialize __kfifo_put, so we don't have to take | |
2937 | * additional lock on fast data-path | |
2938 | */ | |
2939 | if (hdr->opcode & ISCSI_OP_IMMEDIATE) | |
2940 | __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); | |
2941 | else | |
2942 | __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); | |
2943 | ||
2944 | schedule_work(&conn->xmitwork); | |
2945 | ||
2946 | return 0; | |
2947 | } | |
2948 | ||
2949 | static int | |
2950 | iscsi_eh_host_reset(struct scsi_cmnd *sc) | |
2951 | { | |
2952 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; | |
2953 | struct iscsi_conn *conn = ctask->conn; | |
2954 | struct iscsi_session *session = conn->session; | |
2955 | ||
2956 | spin_lock_bh(&session->lock); | |
2957 | if (session->state == ISCSI_STATE_TERMINATE) { | |
2958 | debug_scsi("failing host reset: session terminated " | |
2959 | "[CID %d age %d]", conn->id, session->age); | |
2960 | spin_unlock_bh(&session->lock); | |
2961 | return FAILED; | |
2962 | } | |
2963 | spin_unlock_bh(&session->lock); | |
2964 | ||
2965 | debug_scsi("failing connection CID %d due to SCSI host reset " | |
2966 | "[itt 0x%x age %d]", conn->id, ctask->itt, | |
2967 | session->age); | |
2968 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2969 | ||
2970 | return SUCCESS; | |
2971 | } | |
2972 | ||
2973 | static void | |
2974 | iscsi_tmabort_timedout(unsigned long data) | |
2975 | { | |
2976 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; | |
2977 | struct iscsi_conn *conn = ctask->conn; | |
2978 | struct iscsi_session *session = conn->session; | |
2979 | ||
2980 | spin_lock(&session->lock); | |
2981 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
2982 | __kfifo_put(session->mgmtpool.queue, | |
2983 | (void*)&ctask->mtask, sizeof(void*)); | |
2984 | conn->tmabort_state = TMABORT_TIMEDOUT; | |
2985 | debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n", | |
2986 | (long)ctask->sc, ctask->itt); | |
2987 | /* unblock eh_abort() */ | |
2988 | wake_up(&conn->ehwait); | |
2989 | } | |
2990 | spin_unlock(&session->lock); | |
2991 | } | |
2992 | ||
2993 | static int | |
2994 | iscsi_eh_abort(struct scsi_cmnd *sc) | |
2995 | { | |
2996 | int rc; | |
2997 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; | |
2998 | struct iscsi_conn *conn = ctask->conn; | |
2999 | struct iscsi_session *session = conn->session; | |
3000 | ||
3001 | conn->eh_abort_cnt++; | |
3002 | debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
3003 | ||
3004 | /* | |
3005 | * two cases for ERL=0 here: | |
3006 | * | |
3007 | * 1) connection-level failure; | |
3008 | * 2) recovery due protocol error; | |
3009 | */ | |
3010 | down(&conn->xmitsema); | |
3011 | spin_lock_bh(&session->lock); | |
3012 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
3013 | if (session->state == ISCSI_STATE_TERMINATE) { | |
3014 | spin_unlock_bh(&session->lock); | |
3015 | up(&conn->xmitsema); | |
3016 | goto failed; | |
3017 | } | |
3018 | spin_unlock_bh(&session->lock); | |
3019 | } else { | |
3020 | struct iscsi_tm *hdr = &conn->tmhdr; | |
3021 | ||
3022 | /* | |
3023 | * Still LOGGED_IN... | |
3024 | */ | |
3025 | ||
3026 | if (!ctask->sc || sc->SCp.phase != session->age) { | |
3027 | /* | |
3028 | * 1) ctask completed before time out. But session | |
3029 | * is still ok => Happy Retry. | |
3030 | * 2) session was re-open during time out of ctask. | |
3031 | */ | |
3032 | spin_unlock_bh(&session->lock); | |
3033 | up(&conn->xmitsema); | |
3034 | goto success; | |
3035 | } | |
3036 | conn->tmabort_state = TMABORT_INITIAL; | |
3037 | spin_unlock_bh(&session->lock); | |
3038 | ||
3039 | /* | |
3040 | * ctask timed out but session is OK | |
3041 | * ERL=0 requires task mgmt abort to be issued on each | |
3042 | * failed command. requests must be serialized. | |
3043 | */ | |
3044 | memset(hdr, 0, sizeof(struct iscsi_tm)); | |
3045 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
3046 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; | |
3047 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
3048 | memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); | |
3049 | hdr->rtt = ctask->hdr.itt; | |
3050 | hdr->refcmdsn = ctask->hdr.cmdsn; | |
3051 | ||
3052 | rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, | |
3053 | NULL, 0); | |
3054 | if (rc) { | |
3055 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
3056 | debug_scsi("abort sent failure [itt 0x%x]", ctask->itt); | |
3057 | } else { | |
3058 | struct iscsi_r2t_info *r2t; | |
3059 | ||
3060 | /* | |
3061 | * TMF abort vs. TMF response race logic | |
3062 | */ | |
3063 | spin_lock_bh(&session->lock); | |
3064 | ctask->mtask = (struct iscsi_mgmt_task *) | |
3065 | session->mgmt_cmds[(hdr->itt & ITT_MASK) - | |
3066 | ISCSI_MGMT_ITT_OFFSET]; | |
3067 | /* | |
3068 | * have to flush r2tqueue to avoid r2t leaks | |
3069 | */ | |
3070 | while (__kfifo_get(ctask->r2tqueue, (void*)&r2t, | |
3071 | sizeof(void*))) { | |
3072 | __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, | |
3073 | sizeof(void*)); | |
3074 | } | |
3075 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
3076 | conn->tmfcmd_pdus_cnt++; | |
3077 | conn->tmabort_timer.expires = 3*HZ + jiffies; | |
3078 | conn->tmabort_timer.function = | |
3079 | iscsi_tmabort_timedout; | |
3080 | conn->tmabort_timer.data = (unsigned long)ctask; | |
3081 | add_timer(&conn->tmabort_timer); | |
3082 | debug_scsi("abort sent [itt 0x%x]", ctask->itt); | |
3083 | } else { | |
3084 | if (!ctask->sc || | |
3085 | conn->tmabort_state == TMABORT_SUCCESS) { | |
3086 | conn->tmabort_state = TMABORT_INITIAL; | |
3087 | spin_unlock_bh(&session->lock); | |
3088 | up(&conn->xmitsema); | |
3089 | goto success; | |
3090 | } | |
3091 | conn->tmabort_state = TMABORT_INITIAL; | |
3092 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
3093 | } | |
3094 | spin_unlock_bh(&session->lock); | |
3095 | } | |
3096 | } | |
3097 | up(&conn->xmitsema); | |
3098 | ||
3099 | ||
3100 | /* | |
3101 | * block eh thread until: | |
3102 | * | |
3103 | * 1) abort response; | |
3104 | * 2) abort timeout; | |
3105 | * 3) session re-opened; | |
3106 | * 4) session terminated; | |
3107 | */ | |
3108 | for (;;) { | |
3109 | int p_state = session->state; | |
3110 | ||
3111 | rc = wait_event_interruptible(conn->ehwait, | |
3112 | (p_state == ISCSI_STATE_LOGGED_IN ? | |
3113 | (session->state == ISCSI_STATE_TERMINATE || | |
3114 | conn->tmabort_state != TMABORT_INITIAL) : | |
3115 | (session->state == ISCSI_STATE_TERMINATE || | |
3116 | session->state == ISCSI_STATE_LOGGED_IN))); | |
3117 | if (rc) { | |
3118 | /* shutdown.. */ | |
3119 | session->state = ISCSI_STATE_TERMINATE; | |
3120 | goto failed; | |
3121 | } | |
3122 | ||
3123 | if (signal_pending(current)) | |
3124 | flush_signals(current); | |
3125 | ||
3126 | if (session->state == ISCSI_STATE_TERMINATE) | |
3127 | goto failed; | |
3128 | ||
3129 | spin_lock_bh(&session->lock); | |
3130 | if (sc->SCp.phase == session->age && | |
3131 | (conn->tmabort_state == TMABORT_TIMEDOUT || | |
3132 | conn->tmabort_state == TMABORT_FAILED)) { | |
3133 | conn->tmabort_state = TMABORT_INITIAL; | |
3134 | if (!ctask->sc) { | |
3135 | /* | |
3136 | * ctask completed before tmf abort response or | |
3137 | * time out. | |
3138 | * But session is still ok => Happy Retry. | |
3139 | */ | |
3140 | spin_unlock_bh(&session->lock); | |
3141 | break; | |
3142 | } | |
3143 | spin_unlock_bh(&session->lock); | |
3144 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
3145 | continue; | |
3146 | } | |
3147 | spin_unlock_bh(&session->lock); | |
3148 | break; | |
3149 | } | |
3150 | ||
3151 | success: | |
3152 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
3153 | rc = SUCCESS; | |
3154 | goto exit; | |
3155 | ||
3156 | failed: | |
3157 | debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
3158 | rc = FAILED; | |
3159 | ||
3160 | exit: | |
3161 | del_timer_sync(&conn->tmabort_timer); | |
3162 | ||
3163 | down(&conn->xmitsema); | |
3164 | if (conn->sock) { | |
3165 | struct sock *sk = conn->sock->sk; | |
3166 | ||
3167 | write_lock_bh(&sk->sk_callback_lock); | |
3168 | iscsi_ctask_cleanup(conn, ctask); | |
3169 | write_unlock_bh(&sk->sk_callback_lock); | |
3170 | } | |
3171 | up(&conn->xmitsema); | |
3172 | return rc; | |
3173 | } | |
3174 | ||
3175 | static int | |
3176 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
3177 | { | |
3178 | int i; | |
3179 | int cmd_i; | |
3180 | ||
3181 | /* | |
3182 | * initialize per-task: R2T pool and xmit queue | |
3183 | */ | |
3184 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
3185 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
3186 | ||
3187 | /* | |
3188 | * pre-allocated x4 as much r2ts to handle race when | |
3189 | * target acks DataOut faster than we data_xmit() queues | |
3190 | * could replenish r2tqueue. | |
3191 | */ | |
3192 | ||
3193 | /* R2T pool */ | |
3194 | if (iscsi_pool_init(&ctask->r2tpool, session->max_r2t * 4, | |
3195 | (void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) { | |
3196 | goto r2t_alloc_fail; | |
3197 | } | |
3198 | ||
3199 | /* R2T xmit queue */ | |
3200 | ctask->r2tqueue = kfifo_alloc( | |
3201 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); | |
3202 | if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) { | |
3203 | iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts); | |
3204 | goto r2t_alloc_fail; | |
3205 | } | |
3206 | ||
3207 | /* | |
3208 | * number of | |
3209 | * Data-Out PDU's within R2T-sequence can be quite big; | |
3210 | * using mempool | |
3211 | */ | |
3212 | ctask->datapool = mempool_create(ISCSI_DTASK_DEFAULT_MAX, | |
3213 | mempool_alloc_slab, mempool_free_slab, taskcache); | |
3214 | if (ctask->datapool == NULL) { | |
3215 | kfifo_free(ctask->r2tqueue); | |
3216 | iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts); | |
3217 | goto r2t_alloc_fail; | |
3218 | } | |
3219 | INIT_LIST_HEAD(&ctask->dataqueue); | |
3220 | } | |
3221 | ||
3222 | return 0; | |
3223 | ||
3224 | r2t_alloc_fail: | |
3225 | for (i = 0; i < cmd_i; i++) { | |
3226 | mempool_destroy(session->cmds[i]->datapool); | |
3227 | kfifo_free(session->cmds[i]->r2tqueue); | |
3228 | iscsi_pool_free(&session->cmds[i]->r2tpool, | |
3229 | (void**)session->cmds[i]->r2ts); | |
3230 | } | |
3231 | return -ENOMEM; | |
3232 | } | |
3233 | ||
3234 | static void | |
3235 | iscsi_r2tpool_free(struct iscsi_session *session) | |
3236 | { | |
3237 | int i; | |
3238 | ||
3239 | for (i = 0; i < session->cmds_max; i++) { | |
3240 | mempool_destroy(session->cmds[i]->datapool); | |
3241 | kfifo_free(session->cmds[i]->r2tqueue); | |
3242 | iscsi_pool_free(&session->cmds[i]->r2tpool, | |
3243 | (void**)session->cmds[i]->r2ts); | |
3244 | } | |
3245 | } | |
3246 | ||
3247 | static struct scsi_host_template iscsi_sht = { | |
3248 | .name = "iSCSI Initiator over TCP/IP, v." | |
3249 | ISCSI_VERSION_STR, | |
3250 | .queuecommand = iscsi_queuecommand, | |
3251 | .can_queue = ISCSI_XMIT_CMDS_MAX - 1, | |
3252 | .sg_tablesize = ISCSI_SG_TABLESIZE, | |
3253 | .cmd_per_lun = ISCSI_CMD_PER_LUN, | |
3254 | .eh_abort_handler = iscsi_eh_abort, | |
3255 | .eh_host_reset_handler = iscsi_eh_host_reset, | |
3256 | .use_clustering = DISABLE_CLUSTERING, | |
3257 | .proc_name = "iscsi_tcp", | |
3258 | .this_id = -1, | |
3259 | }; | |
3260 | ||
3261 | static iscsi_sessionh_t | |
3262 | iscsi_session_create(uint32_t initial_cmdsn, struct Scsi_Host *host) | |
3263 | { | |
3264 | int cmd_i; | |
3265 | struct iscsi_session *session; | |
3266 | ||
3267 | session = iscsi_hostdata(host->hostdata); | |
3268 | memset(session, 0, sizeof(struct iscsi_session)); | |
3269 | ||
3270 | session->host = host; | |
3271 | session->id = host->host_no; | |
3272 | session->state = ISCSI_STATE_LOGGED_IN; | |
3273 | session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; | |
3274 | session->cmds_max = ISCSI_XMIT_CMDS_MAX; | |
3275 | session->cmdsn = initial_cmdsn; | |
3276 | session->exp_cmdsn = initial_cmdsn + 1; | |
3277 | session->max_cmdsn = initial_cmdsn + 1; | |
3278 | session->max_r2t = 1; | |
3279 | ||
3280 | /* initialize SCSI PDU commands pool */ | |
3281 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
3282 | (void***)&session->cmds, sizeof(struct iscsi_cmd_task))) | |
3283 | goto cmdpool_alloc_fail; | |
3284 | ||
3285 | /* pre-format cmds pool with ITT */ | |
3286 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) | |
3287 | session->cmds[cmd_i]->itt = cmd_i; | |
3288 | ||
3289 | spin_lock_init(&session->lock); | |
3290 | INIT_LIST_HEAD(&session->connections); | |
3291 | ||
3292 | /* initialize immediate command pool */ | |
3293 | if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, | |
3294 | (void***)&session->mgmt_cmds, sizeof(struct iscsi_mgmt_task))) | |
3295 | goto mgmtpool_alloc_fail; | |
3296 | ||
3297 | ||
3298 | /* pre-format immediate cmds pool with ITT */ | |
3299 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
3300 | session->mgmt_cmds[cmd_i]->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; | |
3301 | session->mgmt_cmds[cmd_i]->data = kmalloc( | |
3302 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL); | |
3303 | if (!session->mgmt_cmds[cmd_i]->data) { | |
3304 | int j; | |
3305 | ||
3306 | for (j = 0; j < cmd_i; j++) | |
3307 | kfree(session->mgmt_cmds[j]->data); | |
3308 | goto immdata_alloc_fail; | |
3309 | } | |
3310 | } | |
3311 | ||
3312 | if (iscsi_r2tpool_alloc(session)) | |
3313 | goto r2tpool_alloc_fail; | |
3314 | ||
3315 | return iscsi_handle(session); | |
3316 | ||
3317 | r2tpool_alloc_fail: | |
3318 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) | |
3319 | kfree(session->mgmt_cmds[cmd_i]->data); | |
3320 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); | |
3321 | immdata_alloc_fail: | |
3322 | mgmtpool_alloc_fail: | |
3323 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
3324 | cmdpool_alloc_fail: | |
3325 | return iscsi_handle(NULL); | |
3326 | } | |
3327 | ||
3328 | static void | |
3329 | iscsi_session_destroy(iscsi_sessionh_t sessionh) | |
3330 | { | |
3331 | int cmd_i; | |
3332 | struct iscsi_data_task *dtask, *n; | |
3333 | struct iscsi_session *session = iscsi_ptr(sessionh); | |
3334 | ||
3335 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
3336 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
3337 | list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) { | |
3338 | list_del(&dtask->item); | |
3339 | mempool_free(dtask, ctask->datapool); | |
3340 | } | |
3341 | } | |
3342 | ||
3343 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) | |
3344 | kfree(session->mgmt_cmds[cmd_i]->data); | |
3345 | ||
3346 | iscsi_r2tpool_free(session); | |
3347 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); | |
3348 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
3349 | } | |
3350 | ||
3351 | static int | |
3352 | iscsi_conn_set_param(iscsi_connh_t connh, enum iscsi_param param, | |
3353 | uint32_t value) | |
3354 | { | |
3355 | struct iscsi_conn *conn = iscsi_ptr(connh); | |
3356 | struct iscsi_session *session = conn->session; | |
3357 | ||
3358 | spin_lock_bh(&session->lock); | |
3359 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && | |
3360 | conn->stop_stage != STOP_CONN_RECOVER) { | |
3361 | printk(KERN_ERR "iscsi_tcp: can not change parameter [%d]\n", | |
3362 | param); | |
3363 | spin_unlock_bh(&session->lock); | |
3364 | return 0; | |
3365 | } | |
3366 | spin_unlock_bh(&session->lock); | |
3367 | ||
3368 | switch(param) { | |
3369 | case ISCSI_PARAM_MAX_RECV_DLENGTH: { | |
3370 | char *saveptr = conn->data; | |
b53cb2a4 | 3371 | gfp_t flags = GFP_KERNEL; |
7ba24713 AA |
3372 | |
3373 | if (conn->data_size >= value) { | |
3374 | conn->max_recv_dlength = value; | |
3375 | break; | |
3376 | } | |
3377 | ||
3378 | spin_lock_bh(&session->lock); | |
3379 | if (conn->stop_stage == STOP_CONN_RECOVER) | |
3380 | flags = GFP_ATOMIC; | |
3381 | spin_unlock_bh(&session->lock); | |
3382 | ||
3383 | if (value <= PAGE_SIZE) | |
3384 | conn->data = kmalloc(value, flags); | |
3385 | else | |
3386 | conn->data = (void*)__get_free_pages(flags, | |
3387 | get_order(value)); | |
3388 | if (conn->data == NULL) { | |
3389 | conn->data = saveptr; | |
3390 | return -ENOMEM; | |
3391 | } | |
3392 | if (conn->data_size <= PAGE_SIZE) | |
3393 | kfree(saveptr); | |
3394 | else | |
3395 | free_pages((unsigned long)saveptr, | |
3396 | get_order(conn->data_size)); | |
3397 | conn->max_recv_dlength = value; | |
3398 | conn->data_size = value; | |
3399 | } | |
3400 | break; | |
3401 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3402 | conn->max_xmit_dlength = value; | |
3403 | break; | |
3404 | case ISCSI_PARAM_HDRDGST_EN: | |
3405 | conn->hdrdgst_en = value; | |
3406 | conn->hdr_size = sizeof(struct iscsi_hdr); | |
3407 | if (conn->hdrdgst_en) { | |
3408 | conn->hdr_size += sizeof(__u32); | |
3409 | if (!conn->tx_tfm) | |
3410 | conn->tx_tfm = crypto_alloc_tfm("crc32c", 0); | |
3411 | if (!conn->tx_tfm) | |
3412 | return -ENOMEM; | |
3413 | if (!conn->rx_tfm) | |
3414 | conn->rx_tfm = crypto_alloc_tfm("crc32c", 0); | |
3415 | if (!conn->rx_tfm) { | |
3416 | crypto_free_tfm(conn->tx_tfm); | |
3417 | return -ENOMEM; | |
3418 | } | |
3419 | } else { | |
3420 | if (conn->tx_tfm) | |
3421 | crypto_free_tfm(conn->tx_tfm); | |
3422 | if (conn->rx_tfm) | |
3423 | crypto_free_tfm(conn->rx_tfm); | |
3424 | } | |
3425 | break; | |
3426 | case ISCSI_PARAM_DATADGST_EN: | |
3427 | conn->datadgst_en = value; | |
3428 | if (conn->datadgst_en) { | |
3429 | if (!conn->data_tx_tfm) | |
3430 | conn->data_tx_tfm = | |
3431 | crypto_alloc_tfm("crc32c", 0); | |
3432 | if (!conn->data_tx_tfm) | |
3433 | return -ENOMEM; | |
3434 | if (!conn->data_rx_tfm) | |
3435 | conn->data_rx_tfm = | |
3436 | crypto_alloc_tfm("crc32c", 0); | |
3437 | if (!conn->data_rx_tfm) { | |
3438 | crypto_free_tfm(conn->data_tx_tfm); | |
3439 | return -ENOMEM; | |
3440 | } | |
3441 | } else { | |
3442 | if (conn->data_tx_tfm) | |
3443 | crypto_free_tfm(conn->data_tx_tfm); | |
3444 | if (conn->data_rx_tfm) | |
3445 | crypto_free_tfm(conn->data_rx_tfm); | |
3446 | } | |
3447 | break; | |
3448 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3449 | session->initial_r2t_en = value; | |
3450 | break; | |
3451 | case ISCSI_PARAM_MAX_R2T: | |
3452 | if (session->max_r2t == roundup_pow_of_two(value)) | |
3453 | break; | |
3454 | iscsi_r2tpool_free(session); | |
3455 | session->max_r2t = value; | |
3456 | if (session->max_r2t & (session->max_r2t - 1)) | |
3457 | session->max_r2t = roundup_pow_of_two(session->max_r2t); | |
3458 | if (iscsi_r2tpool_alloc(session)) | |
3459 | return -ENOMEM; | |
3460 | break; | |
3461 | case ISCSI_PARAM_IMM_DATA_EN: | |
3462 | session->imm_data_en = value; | |
3463 | break; | |
3464 | case ISCSI_PARAM_FIRST_BURST: | |
3465 | session->first_burst = value; | |
3466 | break; | |
3467 | case ISCSI_PARAM_MAX_BURST: | |
3468 | session->max_burst = value; | |
3469 | break; | |
3470 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3471 | session->pdu_inorder_en = value; | |
3472 | break; | |
3473 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3474 | session->dataseq_inorder_en = value; | |
3475 | break; | |
3476 | case ISCSI_PARAM_ERL: | |
3477 | session->erl = value; | |
3478 | break; | |
3479 | case ISCSI_PARAM_IFMARKER_EN: | |
3480 | BUG_ON(value); | |
3481 | session->ifmarker_en = value; | |
3482 | break; | |
3483 | case ISCSI_PARAM_OFMARKER_EN: | |
3484 | BUG_ON(value); | |
3485 | session->ofmarker_en = value; | |
3486 | break; | |
3487 | default: | |
3488 | break; | |
3489 | } | |
3490 | ||
3491 | return 0; | |
3492 | } | |
3493 | ||
3494 | static int | |
3495 | iscsi_conn_get_param(iscsi_connh_t connh, enum iscsi_param param, | |
3496 | uint32_t *value) | |
3497 | { | |
3498 | struct iscsi_conn *conn = iscsi_ptr(connh); | |
3499 | struct iscsi_session *session = conn->session; | |
3500 | ||
3501 | switch(param) { | |
3502 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
3503 | *value = conn->max_recv_dlength; | |
3504 | break; | |
3505 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3506 | *value = conn->max_xmit_dlength; | |
3507 | break; | |
3508 | case ISCSI_PARAM_HDRDGST_EN: | |
3509 | *value = conn->hdrdgst_en; | |
3510 | break; | |
3511 | case ISCSI_PARAM_DATADGST_EN: | |
3512 | *value = conn->datadgst_en; | |
3513 | break; | |
3514 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3515 | *value = session->initial_r2t_en; | |
3516 | break; | |
3517 | case ISCSI_PARAM_MAX_R2T: | |
3518 | *value = session->max_r2t; | |
3519 | break; | |
3520 | case ISCSI_PARAM_IMM_DATA_EN: | |
3521 | *value = session->imm_data_en; | |
3522 | break; | |
3523 | case ISCSI_PARAM_FIRST_BURST: | |
3524 | *value = session->first_burst; | |
3525 | break; | |
3526 | case ISCSI_PARAM_MAX_BURST: | |
3527 | *value = session->max_burst; | |
3528 | break; | |
3529 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3530 | *value = session->pdu_inorder_en; | |
3531 | break; | |
3532 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3533 | *value = session->dataseq_inorder_en; | |
3534 | break; | |
3535 | case ISCSI_PARAM_ERL: | |
3536 | *value = session->erl; | |
3537 | break; | |
3538 | case ISCSI_PARAM_IFMARKER_EN: | |
3539 | *value = session->ifmarker_en; | |
3540 | break; | |
3541 | case ISCSI_PARAM_OFMARKER_EN: | |
3542 | *value = session->ofmarker_en; | |
3543 | break; | |
3544 | default: | |
3545 | return ISCSI_ERR_PARAM_NOT_FOUND; | |
3546 | } | |
3547 | ||
3548 | return 0; | |
3549 | } | |
3550 | ||
3551 | static void | |
3552 | iscsi_conn_get_stats(iscsi_connh_t connh, struct iscsi_stats *stats) | |
3553 | { | |
3554 | struct iscsi_conn *conn = iscsi_ptr(connh); | |
3555 | ||
3556 | stats->txdata_octets = conn->txdata_octets; | |
3557 | stats->rxdata_octets = conn->rxdata_octets; | |
3558 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
3559 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
3560 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
3561 | stats->datain_pdus = conn->datain_pdus_cnt; | |
3562 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
3563 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
3564 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
3565 | stats->custom_length = 3; | |
3566 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
3567 | stats->custom[0].value = conn->sendpage_failures_cnt; | |
3568 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); | |
3569 | stats->custom[1].value = conn->discontiguous_hdr_cnt; | |
3570 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); | |
3571 | stats->custom[2].value = conn->eh_abort_cnt; | |
3572 | } | |
3573 | ||
3574 | static int | |
3575 | iscsi_conn_send_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr, char *data, | |
3576 | uint32_t data_size) | |
3577 | { | |
3578 | struct iscsi_conn *conn = iscsi_ptr(connh); | |
3579 | int rc; | |
3580 | ||
3581 | down(&conn->xmitsema); | |
3582 | rc = iscsi_conn_send_generic(conn, hdr, data, data_size); | |
3583 | up(&conn->xmitsema); | |
3584 | ||
3585 | return rc; | |
3586 | } | |
3587 | ||
3588 | static struct iscsi_transport iscsi_tcp_transport = { | |
3589 | .owner = THIS_MODULE, | |
3590 | .name = "tcp", | |
3591 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
3592 | | CAP_DATADGST, | |
3593 | .host_template = &iscsi_sht, | |
3594 | .hostdata_size = sizeof(struct iscsi_session), | |
3595 | .max_conn = 1, | |
3596 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, | |
3597 | .create_session = iscsi_session_create, | |
3598 | .destroy_session = iscsi_session_destroy, | |
3599 | .create_conn = iscsi_conn_create, | |
3600 | .bind_conn = iscsi_conn_bind, | |
3601 | .destroy_conn = iscsi_conn_destroy, | |
3602 | .set_param = iscsi_conn_set_param, | |
3603 | .get_param = iscsi_conn_get_param, | |
3604 | .start_conn = iscsi_conn_start, | |
3605 | .stop_conn = iscsi_conn_stop, | |
3606 | .send_pdu = iscsi_conn_send_pdu, | |
3607 | .get_stats = iscsi_conn_get_stats, | |
3608 | }; | |
3609 | ||
3610 | static int __init | |
3611 | iscsi_tcp_init(void) | |
3612 | { | |
3613 | int error; | |
3614 | ||
3615 | if (iscsi_max_lun < 1) { | |
3616 | printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); | |
3617 | return -EINVAL; | |
3618 | } | |
3619 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
3620 | ||
3621 | taskcache = kmem_cache_create("iscsi_taskcache", | |
3622 | sizeof(struct iscsi_data_task), 0, | |
3623 | SLAB_HWCACHE_ALIGN | SLAB_NO_REAP, NULL, NULL); | |
3624 | if (!taskcache) | |
3625 | return -ENOMEM; | |
3626 | ||
3627 | error = iscsi_register_transport(&iscsi_tcp_transport); | |
3628 | if (error) | |
3629 | kmem_cache_destroy(taskcache); | |
3630 | ||
3631 | return error; | |
3632 | } | |
3633 | ||
3634 | static void __exit | |
3635 | iscsi_tcp_exit(void) | |
3636 | { | |
3637 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
3638 | kmem_cache_destroy(taskcache); | |
3639 | } | |
3640 | ||
3641 | module_init(iscsi_tcp_init); | |
3642 | module_exit(iscsi_tcp_exit); |