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7ba24713 AA |
1 | /* |
2 | * iSCSI Initiator over TCP/IP Data-Path | |
3 | * | |
4 | * Copyright (C) 2004 Dmitry Yusupov | |
5 | * Copyright (C) 2004 Alex Aizman | |
5bb0b55a MC |
6 | * Copyright (C) 2005 - 2006 Mike Christie |
7 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
7ba24713 AA |
8 | * maintained by open-iscsi@googlegroups.com |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published | |
12 | * by the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * See the file COPYING included with this distribution for more details. | |
21 | * | |
22 | * Credits: | |
23 | * Christoph Hellwig | |
24 | * FUJITA Tomonori | |
25 | * Arne Redlich | |
26 | * Zhenyu Wang | |
27 | */ | |
28 | ||
29 | #include <linux/types.h> | |
30 | #include <linux/list.h> | |
31 | #include <linux/inet.h> | |
32 | #include <linux/blkdev.h> | |
33 | #include <linux/crypto.h> | |
34 | #include <linux/delay.h> | |
35 | #include <linux/kfifo.h> | |
36 | #include <linux/scatterlist.h> | |
0b950672 | 37 | #include <linux/mutex.h> |
7ba24713 AA |
38 | #include <net/tcp.h> |
39 | #include <scsi/scsi_cmnd.h> | |
7ba24713 AA |
40 | #include <scsi/scsi_host.h> |
41 | #include <scsi/scsi.h> | |
42 | #include <scsi/scsi_transport_iscsi.h> | |
43 | ||
44 | #include "iscsi_tcp.h" | |
45 | ||
46 | MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
47 | "Alex Aizman <itn780@yahoo.com>"); | |
48 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
49 | MODULE_LICENSE("GPL"); | |
4d841d6b | 50 | MODULE_VERSION("0:4.445"); |
7ba24713 | 51 | /* #define DEBUG_TCP */ |
7ba24713 AA |
52 | #define DEBUG_ASSERT |
53 | ||
54 | #ifdef DEBUG_TCP | |
5bb0b55a | 55 | #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) |
7ba24713 AA |
56 | #else |
57 | #define debug_tcp(fmt...) | |
58 | #endif | |
59 | ||
7ba24713 AA |
60 | #ifndef DEBUG_ASSERT |
61 | #ifdef BUG_ON | |
62 | #undef BUG_ON | |
63 | #endif | |
64 | #define BUG_ON(expr) | |
65 | #endif | |
66 | ||
7ba24713 AA |
67 | static unsigned int iscsi_max_lun = 512; |
68 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
69 | ||
70 | /* global data */ | |
71 | static kmem_cache_t *taskcache; | |
72 | ||
73 | static inline void | |
74 | iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size) | |
75 | { | |
76 | sg_init_one(&ibuf->sg, (u8 *)vbuf, size); | |
77 | ibuf->sent = 0; | |
7cae5159 | 78 | ibuf->use_sendmsg = 0; |
7ba24713 AA |
79 | } |
80 | ||
81 | static inline void | |
82 | iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size) | |
83 | { | |
7cae5159 MC |
84 | ibuf->sg.page = virt_to_page(vbuf); |
85 | ibuf->sg.offset = offset_in_page(vbuf); | |
7ba24713 AA |
86 | ibuf->sg.length = size; |
87 | ibuf->sent = 0; | |
7cae5159 | 88 | ibuf->use_sendmsg = 1; |
7ba24713 AA |
89 | } |
90 | ||
91 | static inline void | |
92 | iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg) | |
93 | { | |
7cae5159 MC |
94 | ibuf->sg.page = sg->page; |
95 | ibuf->sg.offset = sg->offset; | |
96 | ibuf->sg.length = sg->length; | |
7ba24713 AA |
97 | /* |
98 | * Fastpath: sg element fits into single page | |
99 | */ | |
a1e80c20 | 100 | if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page)) |
7cae5159 MC |
101 | ibuf->use_sendmsg = 0; |
102 | else | |
103 | ibuf->use_sendmsg = 1; | |
7ba24713 AA |
104 | ibuf->sent = 0; |
105 | } | |
106 | ||
107 | static inline int | |
108 | iscsi_buf_left(struct iscsi_buf *ibuf) | |
109 | { | |
110 | int rc; | |
111 | ||
112 | rc = ibuf->sg.length - ibuf->sent; | |
113 | BUG_ON(rc < 0); | |
114 | return rc; | |
115 | } | |
116 | ||
117 | static inline void | |
af973481 MC |
118 | iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, |
119 | u8* crc) | |
7ba24713 | 120 | { |
5bb0b55a | 121 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 122 | |
5bb0b55a MC |
123 | crypto_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc); |
124 | buf->sg.length += sizeof(uint32_t); | |
7ba24713 AA |
125 | } |
126 | ||
127 | static inline int | |
5bb0b55a | 128 | iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 129 | { |
5bb0b55a | 130 | struct sk_buff *skb = tcp_conn->in.skb; |
7ba24713 | 131 | |
5bb0b55a | 132 | tcp_conn->in.zero_copy_hdr = 0; |
7ba24713 | 133 | |
5bb0b55a MC |
134 | if (tcp_conn->in.copy >= tcp_conn->hdr_size && |
135 | tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) { | |
7ba24713 AA |
136 | /* |
137 | * Zero-copy PDU Header: using connection context | |
138 | * to store header pointer. | |
139 | */ | |
140 | if (skb_shinfo(skb)->frag_list == NULL && | |
5bb0b55a MC |
141 | !skb_shinfo(skb)->nr_frags) { |
142 | tcp_conn->in.hdr = (struct iscsi_hdr *) | |
143 | ((char*)skb->data + tcp_conn->in.offset); | |
144 | tcp_conn->in.zero_copy_hdr = 1; | |
145 | } else { | |
7ba24713 AA |
146 | /* ignoring return code since we checked |
147 | * in.copy before */ | |
5bb0b55a MC |
148 | skb_copy_bits(skb, tcp_conn->in.offset, |
149 | &tcp_conn->hdr, tcp_conn->hdr_size); | |
150 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
7ba24713 | 151 | } |
5bb0b55a MC |
152 | tcp_conn->in.offset += tcp_conn->hdr_size; |
153 | tcp_conn->in.copy -= tcp_conn->hdr_size; | |
7ba24713 AA |
154 | } else { |
155 | int hdr_remains; | |
156 | int copylen; | |
157 | ||
158 | /* | |
159 | * PDU header scattered across SKB's, | |
160 | * copying it... This'll happen quite rarely. | |
161 | */ | |
162 | ||
5bb0b55a MC |
163 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) |
164 | tcp_conn->in.hdr_offset = 0; | |
7ba24713 | 165 | |
5bb0b55a | 166 | hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset; |
7ba24713 AA |
167 | BUG_ON(hdr_remains <= 0); |
168 | ||
5bb0b55a MC |
169 | copylen = min(tcp_conn->in.copy, hdr_remains); |
170 | skb_copy_bits(skb, tcp_conn->in.offset, | |
171 | (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset, | |
172 | copylen); | |
7ba24713 AA |
173 | |
174 | debug_tcp("PDU gather offset %d bytes %d in.offset %d " | |
5bb0b55a MC |
175 | "in.copy %d\n", tcp_conn->in.hdr_offset, copylen, |
176 | tcp_conn->in.offset, tcp_conn->in.copy); | |
7ba24713 | 177 | |
5bb0b55a MC |
178 | tcp_conn->in.offset += copylen; |
179 | tcp_conn->in.copy -= copylen; | |
7ba24713 | 180 | if (copylen < hdr_remains) { |
5bb0b55a MC |
181 | tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER; |
182 | tcp_conn->in.hdr_offset += copylen; | |
7ba24713 AA |
183 | return -EAGAIN; |
184 | } | |
5bb0b55a MC |
185 | tcp_conn->in.hdr = &tcp_conn->hdr; |
186 | tcp_conn->discontiguous_hdr_cnt++; | |
187 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
188 | } |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
30a6c652 MC |
193 | /* |
194 | * must be called with session lock | |
195 | */ | |
196 | static void | |
197 | __iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 198 | { |
5bb0b55a | 199 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
30a6c652 | 200 | struct scsi_cmnd *sc; |
7ba24713 | 201 | |
30a6c652 MC |
202 | sc = ctask->sc; |
203 | if (unlikely(!sc)) | |
7ba24713 | 204 | return; |
30a6c652 | 205 | |
7ba24713 AA |
206 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
207 | struct iscsi_data_task *dtask, *n; | |
5bb0b55a | 208 | |
7ba24713 | 209 | /* WRITE: cleanup Data-Out's if any */ |
5bb0b55a MC |
210 | list_for_each_entry_safe(dtask, n, &tcp_ctask->dataqueue, |
211 | item) { | |
7ba24713 | 212 | list_del(&dtask->item); |
5bb0b55a | 213 | mempool_free(dtask, tcp_ctask->datapool); |
7ba24713 | 214 | } |
7ba24713 | 215 | } |
5bb0b55a MC |
216 | tcp_ctask->xmstate = XMSTATE_IDLE; |
217 | tcp_ctask->r2t = NULL; | |
7ba24713 AA |
218 | } |
219 | ||
220 | /** | |
221 | * iscsi_data_rsp - SCSI Data-In Response processing | |
222 | * @conn: iscsi connection | |
223 | * @ctask: scsi command task | |
224 | **/ | |
225 | static int | |
226 | iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
227 | { | |
228 | int rc; | |
5bb0b55a MC |
229 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
230 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
231 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
7ba24713 AA |
232 | struct iscsi_session *session = conn->session; |
233 | int datasn = be32_to_cpu(rhdr->datasn); | |
234 | ||
235 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
236 | if (rc) | |
237 | return rc; | |
238 | /* | |
239 | * setup Data-In byte counter (gets decremented..) | |
240 | */ | |
5bb0b55a | 241 | ctask->data_count = tcp_conn->in.datalen; |
7ba24713 | 242 | |
5bb0b55a | 243 | if (tcp_conn->in.datalen == 0) |
7ba24713 AA |
244 | return 0; |
245 | ||
246 | if (ctask->datasn != datasn) | |
247 | return ISCSI_ERR_DATASN; | |
248 | ||
249 | ctask->datasn++; | |
250 | ||
5bb0b55a MC |
251 | tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); |
252 | if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length) | |
7ba24713 AA |
253 | return ISCSI_ERR_DATA_OFFSET; |
254 | ||
255 | if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
256 | struct scsi_cmnd *sc = ctask->sc; | |
257 | ||
258 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
bf310b8f | 259 | if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) { |
7ba24713 AA |
260 | int res_count = be32_to_cpu(rhdr->residual_count); |
261 | ||
262 | if (res_count > 0 && | |
263 | res_count <= sc->request_bufflen) { | |
264 | sc->resid = res_count; | |
265 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
266 | } else | |
267 | sc->result = (DID_BAD_TARGET << 16) | | |
268 | rhdr->cmd_status; | |
bf310b8f | 269 | } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) { |
7ba24713 AA |
270 | sc->resid = be32_to_cpu(rhdr->residual_count); |
271 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
272 | } else | |
273 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
274 | } | |
275 | ||
276 | conn->datain_pdus_cnt++; | |
277 | return 0; | |
278 | } | |
279 | ||
280 | /** | |
281 | * iscsi_solicit_data_init - initialize first Data-Out | |
282 | * @conn: iscsi connection | |
283 | * @ctask: scsi command task | |
284 | * @r2t: R2T info | |
285 | * | |
286 | * Notes: | |
287 | * Initialize first Data-Out within this R2T sequence and finds | |
288 | * proper data_offset within this SCSI command. | |
289 | * | |
290 | * This function is called with connection lock taken. | |
291 | **/ | |
292 | static void | |
293 | iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
294 | struct iscsi_r2t_info *r2t) | |
295 | { | |
296 | struct iscsi_data *hdr; | |
297 | struct iscsi_data_task *dtask; | |
298 | struct scsi_cmnd *sc = ctask->sc; | |
5bb0b55a | 299 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 300 | |
5bb0b55a | 301 | dtask = mempool_alloc(tcp_ctask->datapool, GFP_ATOMIC); |
7ba24713 | 302 | BUG_ON(!dtask); |
30a6c652 | 303 | INIT_LIST_HEAD(&dtask->item); |
7ba24713 AA |
304 | hdr = &dtask->hdr; |
305 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
306 | hdr->ttt = r2t->ttt; | |
307 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
308 | r2t->solicit_datasn++; | |
309 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
310 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
311 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
312 | hdr->exp_statsn = r2t->exp_statsn; |
313 | hdr->offset = cpu_to_be32(r2t->data_offset); | |
314 | if (r2t->data_length > conn->max_xmit_dlength) { | |
315 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
316 | r2t->data_count = conn->max_xmit_dlength; | |
317 | hdr->flags = 0; | |
318 | } else { | |
319 | hton24(hdr->dlength, r2t->data_length); | |
320 | r2t->data_count = r2t->data_length; | |
321 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
322 | } | |
323 | conn->dataout_pdus_cnt++; | |
324 | ||
325 | r2t->sent = 0; | |
326 | ||
af973481 MC |
327 | iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr, |
328 | sizeof(struct iscsi_hdr)); | |
7ba24713 AA |
329 | |
330 | r2t->dtask = dtask; | |
331 | ||
332 | if (sc->use_sg) { | |
333 | int i, sg_count = 0; | |
334 | struct scatterlist *sg = sc->request_buffer; | |
335 | ||
336 | r2t->sg = NULL; | |
337 | for (i = 0; i < sc->use_sg; i++, sg += 1) { | |
338 | /* FIXME: prefetch ? */ | |
339 | if (sg_count + sg->length > r2t->data_offset) { | |
340 | int page_offset; | |
341 | ||
342 | /* sg page found! */ | |
343 | ||
344 | /* offset within this page */ | |
345 | page_offset = r2t->data_offset - sg_count; | |
346 | ||
347 | /* fill in this buffer */ | |
348 | iscsi_buf_init_sg(&r2t->sendbuf, sg); | |
349 | r2t->sendbuf.sg.offset += page_offset; | |
350 | r2t->sendbuf.sg.length -= page_offset; | |
351 | ||
352 | /* xmit logic will continue with next one */ | |
353 | r2t->sg = sg + 1; | |
354 | break; | |
355 | } | |
356 | sg_count += sg->length; | |
357 | } | |
358 | BUG_ON(r2t->sg == NULL); | |
359 | } else | |
5bb0b55a | 360 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
7ba24713 AA |
361 | (char*)sc->request_buffer + r2t->data_offset, |
362 | r2t->data_count); | |
363 | ||
5bb0b55a | 364 | list_add(&dtask->item, &tcp_ctask->dataqueue); |
7ba24713 AA |
365 | } |
366 | ||
367 | /** | |
368 | * iscsi_r2t_rsp - iSCSI R2T Response processing | |
369 | * @conn: iscsi connection | |
370 | * @ctask: scsi command task | |
371 | **/ | |
372 | static int | |
373 | iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
374 | { | |
375 | struct iscsi_r2t_info *r2t; | |
376 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
377 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
378 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
379 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
7ba24713 AA |
380 | int r2tsn = be32_to_cpu(rhdr->r2tsn); |
381 | int rc; | |
382 | ||
5bb0b55a | 383 | if (tcp_conn->in.datalen) |
7ba24713 AA |
384 | return ISCSI_ERR_DATALEN; |
385 | ||
5bb0b55a | 386 | if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn) |
7ba24713 AA |
387 | return ISCSI_ERR_R2TSN; |
388 | ||
389 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
390 | if (rc) | |
391 | return rc; | |
392 | ||
393 | /* FIXME: use R2TSN to detect missing R2T */ | |
394 | ||
395 | /* fill-in new R2T associated with the task */ | |
396 | spin_lock(&session->lock); | |
397 | if (!ctask->sc || ctask->mtask || | |
398 | session->state != ISCSI_STATE_LOGGED_IN) { | |
399 | printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " | |
400 | "recovery...\n", ctask->itt); | |
401 | spin_unlock(&session->lock); | |
402 | return 0; | |
403 | } | |
5bb0b55a | 404 | rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 AA |
405 | BUG_ON(!rc); |
406 | ||
407 | r2t->exp_statsn = rhdr->statsn; | |
408 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
409 | if (r2t->data_length == 0 || | |
410 | r2t->data_length > session->max_burst) { | |
411 | spin_unlock(&session->lock); | |
412 | return ISCSI_ERR_DATALEN; | |
413 | } | |
414 | ||
415 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); | |
416 | if (r2t->data_offset + r2t->data_length > ctask->total_length) { | |
417 | spin_unlock(&session->lock); | |
418 | return ISCSI_ERR_DATALEN; | |
419 | } | |
420 | ||
421 | r2t->ttt = rhdr->ttt; /* no flip */ | |
422 | r2t->solicit_datasn = 0; | |
423 | ||
424 | iscsi_solicit_data_init(conn, ctask, r2t); | |
425 | ||
5bb0b55a MC |
426 | tcp_ctask->exp_r2tsn = r2tsn + 1; |
427 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
428 | __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); | |
429 | __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*)); | |
7ba24713 | 430 | |
55e3299d | 431 | scsi_queue_work(session->host, &conn->xmitwork); |
7ba24713 AA |
432 | conn->r2t_pdus_cnt++; |
433 | spin_unlock(&session->lock); | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | static int | |
5bb0b55a | 439 | iscsi_tcp_hdr_recv(struct iscsi_conn *conn) |
7ba24713 | 440 | { |
5bb0b55a | 441 | int rc = 0, opcode, ahslen; |
7ba24713 | 442 | struct iscsi_hdr *hdr; |
7ba24713 | 443 | struct iscsi_session *session = conn->session; |
5bb0b55a MC |
444 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
445 | uint32_t cdgst, rdgst = 0, itt; | |
7ba24713 | 446 | |
5bb0b55a | 447 | hdr = tcp_conn->in.hdr; |
7ba24713 AA |
448 | |
449 | /* verify PDU length */ | |
5bb0b55a MC |
450 | tcp_conn->in.datalen = ntoh24(hdr->dlength); |
451 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
7ba24713 | 452 | printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", |
5bb0b55a | 453 | tcp_conn->in.datalen, conn->max_recv_dlength); |
7ba24713 AA |
454 | return ISCSI_ERR_DATALEN; |
455 | } | |
5bb0b55a | 456 | tcp_conn->data_copied = 0; |
7ba24713 AA |
457 | |
458 | /* read AHS */ | |
5bb0b55a MC |
459 | ahslen = hdr->hlength << 2; |
460 | tcp_conn->in.offset += ahslen; | |
461 | tcp_conn->in.copy -= ahslen; | |
462 | if (tcp_conn->in.copy < 0) { | |
7ba24713 | 463 | printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " |
5bb0b55a | 464 | "%d bytes\n", ahslen); |
7ba24713 AA |
465 | return ISCSI_ERR_AHSLEN; |
466 | } | |
467 | ||
468 | /* calculate read padding */ | |
5bb0b55a MC |
469 | tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1); |
470 | if (tcp_conn->in.padding) { | |
471 | tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding; | |
472 | debug_scsi("read padding %d bytes\n", tcp_conn->in.padding); | |
7ba24713 AA |
473 | } |
474 | ||
475 | if (conn->hdrdgst_en) { | |
476 | struct scatterlist sg; | |
477 | ||
478 | sg_init_one(&sg, (u8 *)hdr, | |
5bb0b55a MC |
479 | sizeof(struct iscsi_hdr) + ahslen); |
480 | crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst); | |
7ba24713 | 481 | rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + |
5bb0b55a | 482 | ahslen); |
8a47cd34 | 483 | if (cdgst != rdgst) { |
5bb0b55a MC |
484 | printk(KERN_ERR "iscsi_tcp: hdrdgst error " |
485 | "recv 0x%x calc 0x%x\n", rdgst, cdgst); | |
8a47cd34 MC |
486 | return ISCSI_ERR_HDR_DGST; |
487 | } | |
7ba24713 AA |
488 | } |
489 | ||
5bb0b55a | 490 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
7ba24713 | 491 | /* verify itt (itt encoding: age+cid+itt) */ |
5bb0b55a MC |
492 | rc = iscsi_verify_itt(conn, hdr, &itt); |
493 | if (rc == ISCSI_ERR_NO_SCSI_CMD) { | |
494 | tcp_conn->in.datalen = 0; /* force drop */ | |
495 | return 0; | |
496 | } else if (rc) | |
497 | return rc; | |
7ba24713 AA |
498 | |
499 | debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", | |
5bb0b55a MC |
500 | opcode, tcp_conn->in.offset, tcp_conn->in.copy, |
501 | ahslen, tcp_conn->in.datalen); | |
7ba24713 | 502 | |
5bb0b55a MC |
503 | switch(opcode) { |
504 | case ISCSI_OP_SCSI_DATA_IN: | |
505 | tcp_conn->in.ctask = session->cmds[itt]; | |
506 | rc = iscsi_data_rsp(conn, tcp_conn->in.ctask); | |
507 | /* fall through */ | |
508 | case ISCSI_OP_SCSI_CMD_RSP: | |
509 | tcp_conn->in.ctask = session->cmds[itt]; | |
510 | if (tcp_conn->in.datalen) | |
511 | goto copy_hdr; | |
7ba24713 | 512 | |
5bb0b55a MC |
513 | spin_lock(&session->lock); |
514 | __iscsi_ctask_cleanup(conn, tcp_conn->in.ctask); | |
515 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); | |
516 | spin_unlock(&session->lock); | |
517 | break; | |
518 | case ISCSI_OP_R2T: | |
519 | tcp_conn->in.ctask = session->cmds[itt]; | |
520 | if (ahslen) | |
521 | rc = ISCSI_ERR_AHSLEN; | |
522 | else if (tcp_conn->in.ctask->sc->sc_data_direction == | |
523 | DMA_TO_DEVICE) | |
524 | rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); | |
525 | else | |
526 | rc = ISCSI_ERR_PROTO; | |
527 | break; | |
528 | case ISCSI_OP_LOGIN_RSP: | |
529 | case ISCSI_OP_TEXT_RSP: | |
530 | case ISCSI_OP_LOGOUT_RSP: | |
531 | case ISCSI_OP_NOOP_IN: | |
532 | case ISCSI_OP_REJECT: | |
533 | case ISCSI_OP_ASYNC_EVENT: | |
534 | if (tcp_conn->in.datalen) | |
535 | goto copy_hdr; | |
536 | /* fall through */ | |
537 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
538 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
539 | break; | |
540 | default: | |
541 | rc = ISCSI_ERR_BAD_OPCODE; | |
542 | break; | |
543 | } | |
7ba24713 AA |
544 | |
545 | return rc; | |
5bb0b55a MC |
546 | |
547 | copy_hdr: | |
548 | /* | |
549 | * if we did zero copy for the header but we will need multiple | |
550 | * skbs to complete the command then we have to copy the header | |
551 | * for later use | |
552 | */ | |
553 | if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy < | |
554 | (tcp_conn->in.datalen + tcp_conn->in.padding + | |
555 | (conn->datadgst_en ? 4 : 0))) { | |
556 | debug_tcp("Copying header for later use. in.copy %d in.datalen" | |
557 | " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); | |
558 | memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, | |
559 | sizeof(struct iscsi_hdr)); | |
560 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
561 | tcp_conn->in.zero_copy_hdr = 0; | |
562 | } | |
563 | return 0; | |
7ba24713 AA |
564 | } |
565 | ||
566 | /** | |
567 | * iscsi_ctask_copy - copy skb bits to the destanation cmd task | |
5bb0b55a | 568 | * @conn: iscsi tcp connection |
7ba24713 AA |
569 | * @ctask: scsi command task |
570 | * @buf: buffer to copy to | |
571 | * @buf_size: size of buffer | |
572 | * @offset: offset within the buffer | |
573 | * | |
574 | * Notes: | |
575 | * The function calls skb_copy_bits() and updates per-connection and | |
576 | * per-cmd byte counters. | |
577 | * | |
578 | * Read counters (in bytes): | |
579 | * | |
580 | * conn->in.offset offset within in progress SKB | |
581 | * conn->in.copy left to copy from in progress SKB | |
582 | * including padding | |
583 | * conn->in.copied copied already from in progress SKB | |
584 | * conn->data_copied copied already from in progress buffer | |
585 | * ctask->sent total bytes sent up to the MidLayer | |
586 | * ctask->data_count left to copy from in progress Data-In | |
587 | * buf_left left to copy from in progress buffer | |
588 | **/ | |
589 | static inline int | |
5bb0b55a | 590 | iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, |
7ba24713 AA |
591 | void *buf, int buf_size, int offset) |
592 | { | |
5bb0b55a MC |
593 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
594 | int buf_left = buf_size - (tcp_conn->data_copied + offset); | |
595 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
596 | int rc; |
597 | ||
598 | size = min(size, ctask->data_count); | |
599 | ||
600 | debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 601 | size, tcp_conn->in.offset, tcp_conn->in.copied); |
7ba24713 AA |
602 | |
603 | BUG_ON(size <= 0); | |
5bb0b55a | 604 | BUG_ON(tcp_ctask->sent + size > ctask->total_length); |
7ba24713 | 605 | |
5bb0b55a MC |
606 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
607 | (char*)buf + (offset + tcp_conn->data_copied), size); | |
7ba24713 AA |
608 | /* must fit into skb->len */ |
609 | BUG_ON(rc); | |
610 | ||
5bb0b55a MC |
611 | tcp_conn->in.offset += size; |
612 | tcp_conn->in.copy -= size; | |
613 | tcp_conn->in.copied += size; | |
614 | tcp_conn->data_copied += size; | |
615 | tcp_ctask->sent += size; | |
7ba24713 AA |
616 | ctask->data_count -= size; |
617 | ||
5bb0b55a | 618 | BUG_ON(tcp_conn->in.copy < 0); |
7ba24713 AA |
619 | BUG_ON(ctask->data_count < 0); |
620 | ||
5bb0b55a | 621 | if (buf_size != (tcp_conn->data_copied + offset)) { |
7ba24713 | 622 | if (!ctask->data_count) { |
5bb0b55a | 623 | BUG_ON(buf_size - tcp_conn->data_copied < 0); |
7ba24713 | 624 | /* done with this PDU */ |
5bb0b55a | 625 | return buf_size - tcp_conn->data_copied; |
7ba24713 AA |
626 | } |
627 | return -EAGAIN; | |
628 | } | |
629 | ||
630 | /* done with this buffer or with both - PDU and buffer */ | |
5bb0b55a | 631 | tcp_conn->data_copied = 0; |
7ba24713 AA |
632 | return 0; |
633 | } | |
634 | ||
635 | /** | |
636 | * iscsi_tcp_copy - copy skb bits to the destanation buffer | |
5bb0b55a | 637 | * @conn: iscsi tcp connection |
7ba24713 AA |
638 | * |
639 | * Notes: | |
640 | * The function calls skb_copy_bits() and updates per-connection | |
641 | * byte counters. | |
642 | **/ | |
643 | static inline int | |
5bb0b55a | 644 | iscsi_tcp_copy(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 645 | { |
5bb0b55a MC |
646 | void *buf = tcp_conn->data; |
647 | int buf_size = tcp_conn->in.datalen; | |
648 | int buf_left = buf_size - tcp_conn->data_copied; | |
649 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
650 | int rc; |
651 | ||
652 | debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 653 | size, tcp_conn->in.offset, tcp_conn->data_copied); |
7ba24713 AA |
654 | BUG_ON(size <= 0); |
655 | ||
5bb0b55a MC |
656 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
657 | (char*)buf + tcp_conn->data_copied, size); | |
7ba24713 AA |
658 | BUG_ON(rc); |
659 | ||
5bb0b55a MC |
660 | tcp_conn->in.offset += size; |
661 | tcp_conn->in.copy -= size; | |
662 | tcp_conn->in.copied += size; | |
663 | tcp_conn->data_copied += size; | |
7ba24713 | 664 | |
5bb0b55a | 665 | if (buf_size != tcp_conn->data_copied) |
7ba24713 AA |
666 | return -EAGAIN; |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
671 | static inline void | |
5bb0b55a MC |
672 | partial_sg_digest_update(struct iscsi_tcp_conn *tcp_conn, |
673 | struct scatterlist *sg, int offset, int length) | |
7ba24713 AA |
674 | { |
675 | struct scatterlist temp; | |
676 | ||
677 | memcpy(&temp, sg, sizeof(struct scatterlist)); | |
678 | temp.offset = offset; | |
679 | temp.length = length; | |
5bb0b55a | 680 | crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1); |
7ba24713 AA |
681 | } |
682 | ||
f6cfba1d | 683 | static void |
5bb0b55a | 684 | iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) |
f6cfba1d MC |
685 | { |
686 | struct scatterlist tmp; | |
687 | ||
688 | sg_init_one(&tmp, buf, len); | |
5bb0b55a | 689 | crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1); |
f6cfba1d MC |
690 | } |
691 | ||
7ba24713 AA |
692 | static int iscsi_scsi_data_in(struct iscsi_conn *conn) |
693 | { | |
5bb0b55a MC |
694 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
695 | struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; | |
696 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 697 | struct scsi_cmnd *sc = ctask->sc; |
f6cfba1d | 698 | struct scatterlist *sg; |
7ba24713 AA |
699 | int i, offset, rc = 0; |
700 | ||
701 | BUG_ON((void*)ctask != sc->SCp.ptr); | |
702 | ||
703 | /* | |
704 | * copying Data-In into the Scsi_Cmnd | |
705 | */ | |
706 | if (!sc->use_sg) { | |
707 | i = ctask->data_count; | |
5bb0b55a MC |
708 | rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, |
709 | sc->request_bufflen, | |
710 | tcp_ctask->data_offset); | |
7ba24713 AA |
711 | if (rc == -EAGAIN) |
712 | return rc; | |
42f72aa9 | 713 | if (conn->datadgst_en) |
5bb0b55a MC |
714 | iscsi_recv_digest_update(tcp_conn, sc->request_buffer, |
715 | i); | |
7ba24713 AA |
716 | rc = 0; |
717 | goto done; | |
718 | } | |
719 | ||
5bb0b55a | 720 | offset = tcp_ctask->data_offset; |
7ba24713 AA |
721 | sg = sc->request_buffer; |
722 | ||
5bb0b55a MC |
723 | if (tcp_ctask->data_offset) |
724 | for (i = 0; i < tcp_ctask->sg_count; i++) | |
7ba24713 AA |
725 | offset -= sg[i].length; |
726 | /* we've passed through partial sg*/ | |
727 | if (offset < 0) | |
728 | offset = 0; | |
729 | ||
5bb0b55a | 730 | for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { |
7ba24713 AA |
731 | char *dest; |
732 | ||
733 | dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); | |
5bb0b55a | 734 | rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, |
7ba24713 AA |
735 | sg[i].length, offset); |
736 | kunmap_atomic(dest, KM_SOFTIRQ0); | |
737 | if (rc == -EAGAIN) | |
738 | /* continue with the next SKB/PDU */ | |
739 | return rc; | |
740 | if (!rc) { | |
741 | if (conn->datadgst_en) { | |
742 | if (!offset) | |
5bb0b55a MC |
743 | crypto_digest_update( |
744 | tcp_conn->data_rx_tfm, | |
745 | &sg[i], 1); | |
7ba24713 | 746 | else |
5bb0b55a MC |
747 | partial_sg_digest_update(tcp_conn, |
748 | &sg[i], | |
7ba24713 AA |
749 | sg[i].offset + offset, |
750 | sg[i].length - offset); | |
751 | } | |
752 | offset = 0; | |
5bb0b55a | 753 | tcp_ctask->sg_count++; |
7ba24713 AA |
754 | } |
755 | ||
756 | if (!ctask->data_count) { | |
757 | if (rc && conn->datadgst_en) | |
758 | /* | |
759 | * data-in is complete, but buffer not... | |
760 | */ | |
5bb0b55a | 761 | partial_sg_digest_update(tcp_conn, &sg[i], |
7ba24713 AA |
762 | sg[i].offset, sg[i].length-rc); |
763 | rc = 0; | |
764 | break; | |
765 | } | |
766 | ||
5bb0b55a | 767 | if (!tcp_conn->in.copy) |
7ba24713 AA |
768 | return -EAGAIN; |
769 | } | |
770 | BUG_ON(ctask->data_count); | |
771 | ||
772 | done: | |
773 | /* check for non-exceptional status */ | |
5bb0b55a | 774 | if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { |
7ba24713 AA |
775 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", |
776 | (long)sc, sc->result, ctask->itt); | |
5bb0b55a MC |
777 | spin_lock(&conn->session->lock); |
778 | __iscsi_ctask_cleanup(conn, ctask); | |
779 | __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); | |
780 | spin_unlock(&conn->session->lock); | |
7ba24713 AA |
781 | } |
782 | ||
783 | return rc; | |
784 | } | |
785 | ||
786 | static int | |
787 | iscsi_data_recv(struct iscsi_conn *conn) | |
788 | { | |
5bb0b55a MC |
789 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
790 | int rc = 0, opcode; | |
7ba24713 | 791 | |
5bb0b55a MC |
792 | opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
793 | switch (opcode) { | |
7ba24713 AA |
794 | case ISCSI_OP_SCSI_DATA_IN: |
795 | rc = iscsi_scsi_data_in(conn); | |
796 | break; | |
5bb0b55a MC |
797 | case ISCSI_OP_SCSI_CMD_RSP: |
798 | spin_lock(&conn->session->lock); | |
799 | __iscsi_ctask_cleanup(conn, tcp_conn->in.ctask); | |
800 | spin_unlock(&conn->session->lock); | |
7ba24713 AA |
801 | case ISCSI_OP_TEXT_RSP: |
802 | case ISCSI_OP_LOGIN_RSP: | |
5bb0b55a MC |
803 | case ISCSI_OP_NOOP_IN: |
804 | case ISCSI_OP_ASYNC_EVENT: | |
805 | case ISCSI_OP_REJECT: | |
7ba24713 AA |
806 | /* |
807 | * Collect data segment to the connection's data | |
808 | * placeholder | |
809 | */ | |
5bb0b55a | 810 | if (iscsi_tcp_copy(tcp_conn)) { |
7ba24713 AA |
811 | rc = -EAGAIN; |
812 | goto exit; | |
813 | } | |
814 | ||
5bb0b55a MC |
815 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, tcp_conn->data, |
816 | tcp_conn->in.datalen); | |
817 | if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) | |
818 | iscsi_recv_digest_update(tcp_conn, tcp_conn->data, | |
819 | tcp_conn->in.datalen); | |
820 | break; | |
7ba24713 AA |
821 | default: |
822 | BUG_ON(1); | |
823 | } | |
824 | exit: | |
825 | return rc; | |
826 | } | |
827 | ||
828 | /** | |
829 | * iscsi_tcp_data_recv - TCP receive in sendfile fashion | |
830 | * @rd_desc: read descriptor | |
831 | * @skb: socket buffer | |
832 | * @offset: offset in skb | |
833 | * @len: skb->len - offset | |
834 | **/ | |
835 | static int | |
836 | iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
837 | unsigned int offset, size_t len) | |
838 | { | |
839 | int rc; | |
840 | struct iscsi_conn *conn = rd_desc->arg.data; | |
5bb0b55a | 841 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
842 | int processed; |
843 | char pad[ISCSI_PAD_LEN]; | |
844 | struct scatterlist sg; | |
845 | ||
846 | /* | |
847 | * Save current SKB and its offset in the corresponding | |
848 | * connection context. | |
849 | */ | |
5bb0b55a MC |
850 | tcp_conn->in.copy = skb->len - offset; |
851 | tcp_conn->in.offset = offset; | |
852 | tcp_conn->in.skb = skb; | |
853 | tcp_conn->in.len = tcp_conn->in.copy; | |
854 | BUG_ON(tcp_conn->in.copy <= 0); | |
855 | debug_tcp("in %d bytes\n", tcp_conn->in.copy); | |
7ba24713 AA |
856 | |
857 | more: | |
5bb0b55a | 858 | tcp_conn->in.copied = 0; |
7ba24713 AA |
859 | rc = 0; |
860 | ||
861 | if (unlikely(conn->suspend_rx)) { | |
862 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
863 | return 0; | |
864 | } | |
865 | ||
5bb0b55a MC |
866 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || |
867 | tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { | |
868 | rc = iscsi_hdr_extract(tcp_conn); | |
7ba24713 AA |
869 | if (rc) { |
870 | if (rc == -EAGAIN) | |
871 | goto nomore; | |
872 | else { | |
873 | iscsi_conn_failure(conn, rc); | |
874 | return 0; | |
875 | } | |
876 | } | |
877 | ||
878 | /* | |
879 | * Verify and process incoming PDU header. | |
880 | */ | |
5bb0b55a MC |
881 | rc = iscsi_tcp_hdr_recv(conn); |
882 | if (!rc && tcp_conn->in.datalen) { | |
8a47cd34 | 883 | if (conn->datadgst_en) { |
5bb0b55a MC |
884 | BUG_ON(!tcp_conn->data_rx_tfm); |
885 | crypto_digest_init(tcp_conn->data_rx_tfm); | |
7ba24713 | 886 | } |
5bb0b55a | 887 | tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; |
7ba24713 AA |
888 | } else if (rc) { |
889 | iscsi_conn_failure(conn, rc); | |
890 | return 0; | |
891 | } | |
892 | } | |
893 | ||
5bb0b55a | 894 | if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { |
f6cfba1d | 895 | uint32_t recv_digest; |
5bb0b55a | 896 | |
7ba24713 | 897 | debug_tcp("extra data_recv offset %d copy %d\n", |
5bb0b55a MC |
898 | tcp_conn->in.offset, tcp_conn->in.copy); |
899 | skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, | |
f6cfba1d | 900 | &recv_digest, 4); |
5bb0b55a MC |
901 | tcp_conn->in.offset += 4; |
902 | tcp_conn->in.copy -= 4; | |
903 | if (recv_digest != tcp_conn->in.datadgst) { | |
f6cfba1d MC |
904 | debug_tcp("iscsi_tcp: data digest error!" |
905 | "0x%x != 0x%x\n", recv_digest, | |
5bb0b55a | 906 | tcp_conn->in.datadgst); |
f6cfba1d MC |
907 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
908 | return 0; | |
909 | } else { | |
910 | debug_tcp("iscsi_tcp: data digest match!" | |
911 | "0x%x == 0x%x\n", recv_digest, | |
5bb0b55a MC |
912 | tcp_conn->in.datadgst); |
913 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
914 | } |
915 | } | |
916 | ||
5bb0b55a MC |
917 | if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && |
918 | tcp_conn->in.copy) { | |
7ba24713 AA |
919 | |
920 | debug_tcp("data_recv offset %d copy %d\n", | |
5bb0b55a | 921 | tcp_conn->in.offset, tcp_conn->in.copy); |
7ba24713 AA |
922 | |
923 | rc = iscsi_data_recv(conn); | |
924 | if (rc) { | |
925 | if (rc == -EAGAIN) { | |
5bb0b55a MC |
926 | rd_desc->count = tcp_conn->in.datalen - |
927 | tcp_conn->in.ctask->data_count; | |
7ba24713 AA |
928 | goto again; |
929 | } | |
930 | iscsi_conn_failure(conn, rc); | |
931 | return 0; | |
932 | } | |
5bb0b55a MC |
933 | tcp_conn->in.copy -= tcp_conn->in.padding; |
934 | tcp_conn->in.offset += tcp_conn->in.padding; | |
8a47cd34 | 935 | if (conn->datadgst_en) { |
5bb0b55a MC |
936 | if (tcp_conn->in.padding) { |
937 | debug_tcp("padding -> %d\n", | |
938 | tcp_conn->in.padding); | |
939 | memset(pad, 0, tcp_conn->in.padding); | |
940 | sg_init_one(&sg, pad, tcp_conn->in.padding); | |
941 | crypto_digest_update(tcp_conn->data_rx_tfm, | |
942 | &sg, 1); | |
7ba24713 | 943 | } |
5bb0b55a MC |
944 | crypto_digest_final(tcp_conn->data_rx_tfm, |
945 | (u8 *) & tcp_conn->in.datadgst); | |
946 | debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); | |
947 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; | |
7ba24713 | 948 | } else |
5bb0b55a | 949 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
7ba24713 AA |
950 | } |
951 | ||
952 | debug_tcp("f, processed %d from out of %d padding %d\n", | |
5bb0b55a MC |
953 | tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); |
954 | BUG_ON(tcp_conn->in.offset - offset > len); | |
7ba24713 | 955 | |
5bb0b55a | 956 | if (tcp_conn->in.offset - offset != len) { |
7ba24713 | 957 | debug_tcp("continue to process %d bytes\n", |
5bb0b55a | 958 | (int)len - (tcp_conn->in.offset - offset)); |
7ba24713 AA |
959 | goto more; |
960 | } | |
961 | ||
962 | nomore: | |
5bb0b55a | 963 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
964 | BUG_ON(processed == 0); |
965 | return processed; | |
966 | ||
967 | again: | |
5bb0b55a | 968 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
969 | debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", |
970 | processed, (int)len, (int)rd_desc->count); | |
971 | BUG_ON(processed == 0); | |
972 | BUG_ON(processed > len); | |
973 | ||
974 | conn->rxdata_octets += processed; | |
975 | return processed; | |
976 | } | |
977 | ||
978 | static void | |
979 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
980 | { | |
981 | struct iscsi_conn *conn = sk->sk_user_data; | |
982 | read_descriptor_t rd_desc; | |
983 | ||
984 | read_lock(&sk->sk_callback_lock); | |
985 | ||
986 | /* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */ | |
987 | rd_desc.arg.data = conn; | |
988 | rd_desc.count = 0; | |
989 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); | |
990 | ||
991 | read_unlock(&sk->sk_callback_lock); | |
992 | } | |
993 | ||
994 | static void | |
995 | iscsi_tcp_state_change(struct sock *sk) | |
996 | { | |
5bb0b55a | 997 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
998 | struct iscsi_conn *conn; |
999 | struct iscsi_session *session; | |
1000 | void (*old_state_change)(struct sock *); | |
1001 | ||
1002 | read_lock(&sk->sk_callback_lock); | |
1003 | ||
1004 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
1005 | session = conn->session; | |
1006 | ||
e6273993 MC |
1007 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
1008 | sk->sk_state == TCP_CLOSE) && | |
1009 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
1010 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
1011 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1012 | } | |
1013 | ||
5bb0b55a MC |
1014 | tcp_conn = conn->dd_data; |
1015 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
1016 | |
1017 | read_unlock(&sk->sk_callback_lock); | |
1018 | ||
1019 | old_state_change(sk); | |
1020 | } | |
1021 | ||
1022 | /** | |
1023 | * iscsi_write_space - Called when more output buffer space is available | |
1024 | * @sk: socket space is available for | |
1025 | **/ | |
1026 | static void | |
1027 | iscsi_write_space(struct sock *sk) | |
1028 | { | |
1029 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1030 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1031 | ||
1032 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1033 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
5bb0b55a | 1034 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
55e3299d | 1035 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1036 | } |
1037 | ||
1038 | static void | |
1039 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1040 | { | |
5bb0b55a MC |
1041 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1042 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1043 | |
1044 | /* assign new callbacks */ | |
1045 | write_lock_bh(&sk->sk_callback_lock); | |
1046 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1047 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1048 | tcp_conn->old_state_change = sk->sk_state_change; | |
1049 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1050 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1051 | sk->sk_state_change = iscsi_tcp_state_change; | |
1052 | sk->sk_write_space = iscsi_write_space; | |
1053 | write_unlock_bh(&sk->sk_callback_lock); | |
1054 | } | |
1055 | ||
1056 | static void | |
1057 | iscsi_conn_restore_callbacks(struct iscsi_conn *conn) | |
1058 | { | |
5bb0b55a MC |
1059 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1060 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1061 | |
1062 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1063 | write_lock_bh(&sk->sk_callback_lock); | |
1064 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1065 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1066 | sk->sk_state_change = tcp_conn->old_state_change; | |
1067 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1068 | sk->sk_no_check = 0; |
1069 | write_unlock_bh(&sk->sk_callback_lock); | |
1070 | } | |
1071 | ||
1072 | /** | |
1073 | * iscsi_send - generic send routine | |
1074 | * @sk: kernel's socket | |
1075 | * @buf: buffer to write from | |
1076 | * @size: actual size to write | |
1077 | * @flags: socket's flags | |
7ba24713 AA |
1078 | */ |
1079 | static inline int | |
56851698 | 1080 | iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
7ba24713 | 1081 | { |
5bb0b55a MC |
1082 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1083 | struct socket *sk = tcp_conn->sock; | |
7cae5159 | 1084 | int offset = buf->sg.offset + buf->sent; |
7ba24713 | 1085 | |
7cae5159 MC |
1086 | /* |
1087 | * if we got use_sg=0 or are sending something we kmallocd | |
1088 | * then we did not have to do kmap (kmap returns page_address) | |
1089 | * | |
1090 | * if we got use_sg > 0, but had to drop down, we do not | |
1091 | * set clustering so this should only happen for that | |
1092 | * slab case. | |
1093 | */ | |
1094 | if (buf->use_sendmsg) | |
1095 | return sock_no_sendpage(sk, buf->sg.page, offset, size, flags); | |
1096 | else | |
5bb0b55a MC |
1097 | return tcp_conn->sendpage(sk, buf->sg.page, offset, size, |
1098 | flags); | |
7ba24713 AA |
1099 | } |
1100 | ||
1101 | /** | |
1102 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() | |
1103 | * @conn: iscsi connection | |
1104 | * @buf: buffer to write from | |
1105 | * @datalen: lenght of data to be sent after the header | |
1106 | * | |
1107 | * Notes: | |
1108 | * (Tx, Fast Path) | |
1109 | **/ | |
1110 | static inline int | |
1111 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) | |
1112 | { | |
5bb0b55a | 1113 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
1114 | int flags = 0; /* MSG_DONTWAIT; */ |
1115 | int res, size; | |
1116 | ||
1117 | size = buf->sg.length - buf->sent; | |
1118 | BUG_ON(buf->sent + size > buf->sg.length); | |
1119 | if (buf->sent + size != buf->sg.length || datalen) | |
1120 | flags |= MSG_MORE; | |
1121 | ||
56851698 | 1122 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1123 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
1124 | if (res >= 0) { | |
1125 | conn->txdata_octets += res; | |
1126 | buf->sent += res; | |
1127 | if (size != res) | |
1128 | return -EAGAIN; | |
1129 | return 0; | |
1130 | } else if (res == -EAGAIN) { | |
5bb0b55a MC |
1131 | tcp_conn = conn->dd_data; |
1132 | tcp_conn->sendpage_failures_cnt++; | |
1133 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
7ba24713 AA |
1134 | } else if (res == -EPIPE) |
1135 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1136 | ||
1137 | return res; | |
1138 | } | |
1139 | ||
1140 | /** | |
1141 | * iscsi_sendpage - send one page of iSCSI Data-Out. | |
1142 | * @conn: iscsi connection | |
1143 | * @buf: buffer to write from | |
1144 | * @count: remaining data | |
1145 | * @sent: number of bytes sent | |
1146 | * | |
1147 | * Notes: | |
1148 | * (Tx, Fast Path) | |
1149 | **/ | |
1150 | static inline int | |
1151 | iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, | |
1152 | int *count, int *sent) | |
1153 | { | |
5bb0b55a | 1154 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
1155 | int flags = 0; /* MSG_DONTWAIT; */ |
1156 | int res, size; | |
1157 | ||
1158 | size = buf->sg.length - buf->sent; | |
1159 | BUG_ON(buf->sent + size > buf->sg.length); | |
1160 | if (size > *count) | |
1161 | size = *count; | |
b13941f6 | 1162 | if (buf->sent + size != buf->sg.length || *count != size) |
7ba24713 AA |
1163 | flags |= MSG_MORE; |
1164 | ||
56851698 | 1165 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1166 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
1167 | size, buf->sent, *count, *sent, res); | |
1168 | if (res >= 0) { | |
1169 | conn->txdata_octets += res; | |
1170 | buf->sent += res; | |
1171 | *count -= res; | |
1172 | *sent += res; | |
1173 | if (size != res) | |
1174 | return -EAGAIN; | |
1175 | return 0; | |
1176 | } else if (res == -EAGAIN) { | |
5bb0b55a MC |
1177 | tcp_conn = conn->dd_data; |
1178 | tcp_conn->sendpage_failures_cnt++; | |
1179 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
7ba24713 AA |
1180 | } else if (res == -EPIPE) |
1181 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1182 | ||
1183 | return res; | |
1184 | } | |
1185 | ||
1186 | static inline void | |
5bb0b55a MC |
1187 | iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
1188 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1189 | { |
5bb0b55a MC |
1190 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1191 | ||
1192 | BUG_ON(!tcp_conn->data_tx_tfm); | |
1193 | crypto_digest_init(tcp_conn->data_tx_tfm); | |
1194 | tcp_ctask->digest_count = 4; | |
7ba24713 AA |
1195 | } |
1196 | ||
858119e1 | 1197 | static int |
7ba24713 AA |
1198 | iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
1199 | struct iscsi_buf *buf, uint32_t *digest, int final) | |
1200 | { | |
5bb0b55a MC |
1201 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1202 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 AA |
1203 | int rc = 0; |
1204 | int sent = 0; | |
1205 | ||
1206 | if (final) | |
5bb0b55a | 1207 | crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest); |
7ba24713 AA |
1208 | |
1209 | iscsi_buf_init_virt(buf, (char*)digest, 4); | |
5bb0b55a | 1210 | rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
7ba24713 | 1211 | if (rc) { |
5bb0b55a MC |
1212 | tcp_ctask->datadigest = *digest; |
1213 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; | |
7ba24713 | 1214 | } else |
5bb0b55a | 1215 | tcp_ctask->digest_count = 4; |
7ba24713 AA |
1216 | return rc; |
1217 | } | |
1218 | ||
1219 | /** | |
1220 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1221 | * @conn: iscsi connection | |
1222 | * @ctask: scsi command task | |
1223 | * @r2t: R2T info | |
1224 | * @left: bytes left to transfer | |
1225 | * | |
1226 | * Notes: | |
1227 | * Initialize next Data-Out within this R2T sequence and continue | |
1228 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1229 | * | |
1230 | * Called under connection lock. | |
1231 | **/ | |
1232 | static void | |
1233 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1234 | struct iscsi_r2t_info *r2t, int left) | |
1235 | { | |
5bb0b55a | 1236 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1237 | struct iscsi_data *hdr; |
1238 | struct iscsi_data_task *dtask; | |
1239 | struct scsi_cmnd *sc = ctask->sc; | |
1240 | int new_offset; | |
1241 | ||
5bb0b55a | 1242 | dtask = mempool_alloc(tcp_ctask->datapool, GFP_ATOMIC); |
7ba24713 | 1243 | BUG_ON(!dtask); |
30a6c652 | 1244 | INIT_LIST_HEAD(&dtask->item); |
7ba24713 AA |
1245 | hdr = &dtask->hdr; |
1246 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
1247 | hdr->ttt = r2t->ttt; | |
1248 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1249 | r2t->solicit_datasn++; | |
1250 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
1251 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
1252 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
1253 | hdr->exp_statsn = r2t->exp_statsn; |
1254 | new_offset = r2t->data_offset + r2t->sent; | |
1255 | hdr->offset = cpu_to_be32(new_offset); | |
1256 | if (left > conn->max_xmit_dlength) { | |
1257 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1258 | r2t->data_count = conn->max_xmit_dlength; | |
1259 | } else { | |
1260 | hton24(hdr->dlength, left); | |
1261 | r2t->data_count = left; | |
1262 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1263 | } | |
1264 | conn->dataout_pdus_cnt++; | |
1265 | ||
af973481 MC |
1266 | iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr, |
1267 | sizeof(struct iscsi_hdr)); | |
7ba24713 AA |
1268 | |
1269 | r2t->dtask = dtask; | |
1270 | ||
1271 | if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { | |
5bb0b55a | 1272 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
7ba24713 AA |
1273 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1274 | r2t->sg += 1; | |
1275 | } else | |
5bb0b55a | 1276 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
7ba24713 AA |
1277 | (char*)sc->request_buffer + new_offset, |
1278 | r2t->data_count); | |
1279 | ||
5bb0b55a | 1280 | list_add(&dtask->item, &tcp_ctask->dataqueue); |
7ba24713 AA |
1281 | } |
1282 | ||
1283 | static void | |
1284 | iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1285 | { | |
5bb0b55a | 1286 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1287 | struct iscsi_data_task *dtask; |
1288 | ||
5bb0b55a | 1289 | dtask = mempool_alloc(tcp_ctask->datapool, GFP_ATOMIC); |
7ba24713 | 1290 | BUG_ON(!dtask); |
30a6c652 | 1291 | INIT_LIST_HEAD(&dtask->item); |
7ba24713 | 1292 | |
5bb0b55a MC |
1293 | iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr, |
1294 | tcp_ctask->r2t_data_count); | |
1295 | iscsi_buf_init_virt(&tcp_ctask->headbuf, (char*)&dtask->hdr, | |
af973481 | 1296 | sizeof(struct iscsi_hdr)); |
7ba24713 | 1297 | |
5bb0b55a MC |
1298 | list_add(&dtask->item, &tcp_ctask->dataqueue); |
1299 | tcp_ctask->dtask = dtask; | |
7ba24713 AA |
1300 | } |
1301 | ||
1302 | /** | |
5bb0b55a | 1303 | * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 AA |
1304 | * @conn: iscsi connection |
1305 | * @ctask: scsi command task | |
1306 | * @sc: scsi command | |
1307 | **/ | |
1308 | static void | |
5bb0b55a | 1309 | iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
7ba24713 | 1310 | { |
5bb0b55a MC |
1311 | struct scsi_cmnd *sc = ctask->sc; |
1312 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 1313 | |
5bb0b55a | 1314 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
7ba24713 | 1315 | |
5bb0b55a MC |
1316 | tcp_ctask->sent = 0; |
1317 | tcp_ctask->sg_count = 0; | |
7ba24713 AA |
1318 | |
1319 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
5bb0b55a MC |
1320 | tcp_ctask->xmstate = XMSTATE_W_HDR; |
1321 | tcp_ctask->exp_r2tsn = 0; | |
7ba24713 | 1322 | BUG_ON(ctask->total_length == 0); |
5bb0b55a | 1323 | |
7ba24713 AA |
1324 | if (sc->use_sg) { |
1325 | struct scatterlist *sg = sc->request_buffer; | |
1326 | ||
5bb0b55a MC |
1327 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1328 | &sg[tcp_ctask->sg_count++]); | |
1329 | tcp_ctask->sg = sg; | |
1330 | tcp_ctask->bad_sg = sg + sc->use_sg; | |
1331 | } else | |
1332 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, | |
1333 | sc->request_buffer, | |
1334 | sc->request_bufflen); | |
7ba24713 | 1335 | |
5bb0b55a MC |
1336 | if (ctask->imm_count) |
1337 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; | |
1338 | ||
1339 | tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); | |
1340 | if (tcp_ctask->pad_count) { | |
1341 | tcp_ctask->pad_count = ISCSI_PAD_LEN - | |
1342 | tcp_ctask->pad_count; | |
7ba24713 | 1343 | debug_scsi("write padding %d bytes\n", |
5bb0b55a MC |
1344 | tcp_ctask->pad_count); |
1345 | tcp_ctask->xmstate |= XMSTATE_W_PAD; | |
7ba24713 | 1346 | } |
7ba24713 | 1347 | |
5bb0b55a MC |
1348 | if (ctask->unsol_count) |
1349 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR | | |
1350 | XMSTATE_UNS_INIT; | |
1351 | tcp_ctask->r2t_data_count = ctask->total_length - | |
7ba24713 AA |
1352 | ctask->imm_count - |
1353 | ctask->unsol_count; | |
1354 | ||
1355 | debug_scsi("cmd [itt %x total %d imm %d imm_data %d " | |
1356 | "r2t_data %d]\n", | |
1357 | ctask->itt, ctask->total_length, ctask->imm_count, | |
5bb0b55a MC |
1358 | ctask->unsol_count, tcp_ctask->r2t_data_count); |
1359 | } else | |
1360 | tcp_ctask->xmstate = XMSTATE_R_HDR; | |
7ba24713 | 1361 | |
5bb0b55a | 1362 | iscsi_buf_init_virt(&tcp_ctask->headbuf, (char*)ctask->hdr, |
af973481 | 1363 | sizeof(struct iscsi_hdr)); |
7ba24713 AA |
1364 | } |
1365 | ||
1366 | /** | |
5bb0b55a | 1367 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
7ba24713 AA |
1368 | * @conn: iscsi connection |
1369 | * @mtask: task management task | |
1370 | * | |
1371 | * Notes: | |
1372 | * The function can return -EAGAIN in which case caller must | |
1373 | * call it again later, or recover. '0' return code means successful | |
1374 | * xmit. | |
1375 | * | |
1376 | * Management xmit state machine consists of two states: | |
1377 | * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress | |
1378 | * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress | |
1379 | **/ | |
1380 | static int | |
5bb0b55a | 1381 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1382 | { |
5bb0b55a | 1383 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
7ba24713 AA |
1384 | |
1385 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", | |
5bb0b55a | 1386 | conn->id, tcp_mtask->xmstate, mtask->itt); |
7ba24713 | 1387 | |
5bb0b55a MC |
1388 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { |
1389 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; | |
7ba24713 | 1390 | if (mtask->data_count) |
5bb0b55a | 1391 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
af973481 | 1392 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
30a6c652 | 1393 | conn->stop_stage != STOP_CONN_RECOVER && |
af973481 | 1394 | conn->hdrdgst_en) |
5bb0b55a MC |
1395 | iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
1396 | (u8*)tcp_mtask->hdrext); | |
1397 | if (iscsi_sendhdr(conn, &tcp_mtask->headbuf, | |
1398 | mtask->data_count)) { | |
1399 | tcp_mtask->xmstate |= XMSTATE_IMM_HDR; | |
7ba24713 | 1400 | if (mtask->data_count) |
5bb0b55a | 1401 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1402 | return -EAGAIN; |
1403 | } | |
1404 | } | |
1405 | ||
5bb0b55a | 1406 | if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 | 1407 | BUG_ON(!mtask->data_count); |
5bb0b55a | 1408 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1409 | /* FIXME: implement. |
1410 | * Virtual buffer could be spreaded across multiple pages... | |
1411 | */ | |
1412 | do { | |
5bb0b55a MC |
1413 | if (iscsi_sendpage(conn, &tcp_mtask->sendbuf, |
1414 | &mtask->data_count, &tcp_mtask->sent)) { | |
1415 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; | |
7ba24713 AA |
1416 | return -EAGAIN; |
1417 | } | |
1418 | } while (mtask->data_count); | |
1419 | } | |
1420 | ||
5bb0b55a MC |
1421 | BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
1422 | if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
1423 | struct iscsi_session *session = conn->session; | |
1424 | ||
1425 | spin_lock_bh(&session->lock); | |
1426 | list_del(&conn->mtask->running); | |
1427 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, | |
1428 | sizeof(void*)); | |
1429 | spin_unlock_bh(&session->lock); | |
1430 | } | |
7ba24713 AA |
1431 | return 0; |
1432 | } | |
1433 | ||
1434 | static inline int | |
5bb0b55a MC |
1435 | handle_xmstate_r_hdr(struct iscsi_conn *conn, |
1436 | struct iscsi_tcp_cmd_task *tcp_ctask) | |
7ba24713 | 1437 | { |
5bb0b55a | 1438 | tcp_ctask->xmstate &= ~XMSTATE_R_HDR; |
42f72aa9 | 1439 | if (conn->hdrdgst_en) |
5bb0b55a MC |
1440 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
1441 | (u8*)tcp_ctask->hdrext); | |
1442 | if (!iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0)) { | |
1443 | BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE); | |
7ba24713 AA |
1444 | return 0; /* wait for Data-In */ |
1445 | } | |
5bb0b55a | 1446 | tcp_ctask->xmstate |= XMSTATE_R_HDR; |
7ba24713 AA |
1447 | return -EAGAIN; |
1448 | } | |
1449 | ||
1450 | static inline int | |
5bb0b55a MC |
1451 | handle_xmstate_w_hdr(struct iscsi_conn *conn, |
1452 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1453 | { |
5bb0b55a MC |
1454 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1455 | ||
1456 | tcp_ctask->xmstate &= ~XMSTATE_W_HDR; | |
42f72aa9 | 1457 | if (conn->hdrdgst_en) |
5bb0b55a MC |
1458 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
1459 | (u8*)tcp_ctask->hdrext); | |
1460 | if (iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count)) { | |
1461 | tcp_ctask->xmstate |= XMSTATE_W_HDR; | |
7ba24713 AA |
1462 | return -EAGAIN; |
1463 | } | |
1464 | return 0; | |
1465 | } | |
1466 | ||
1467 | static inline int | |
1468 | handle_xmstate_data_digest(struct iscsi_conn *conn, | |
1469 | struct iscsi_cmd_task *ctask) | |
1470 | { | |
5bb0b55a MC |
1471 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1472 | ||
1473 | tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST; | |
1474 | debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest); | |
1475 | if (iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, | |
1476 | &tcp_ctask->datadigest, 0)) { | |
1477 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; | |
7ba24713 | 1478 | debug_tcp("resent data digest 0x%x fail!\n", |
5bb0b55a | 1479 | tcp_ctask->datadigest); |
7ba24713 AA |
1480 | return -EAGAIN; |
1481 | } | |
1482 | return 0; | |
1483 | } | |
1484 | ||
1485 | static inline int | |
1486 | handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1487 | { | |
5bb0b55a MC |
1488 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1489 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1490 | ||
7ba24713 | 1491 | BUG_ON(!ctask->imm_count); |
5bb0b55a | 1492 | tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1493 | |
1494 | if (conn->datadgst_en) { | |
5bb0b55a MC |
1495 | iscsi_data_digest_init(tcp_conn, ctask); |
1496 | tcp_ctask->immdigest = 0; | |
7ba24713 AA |
1497 | } |
1498 | ||
1499 | for (;;) { | |
5bb0b55a MC |
1500 | if (iscsi_sendpage(conn, &tcp_ctask->sendbuf, &ctask->imm_count, |
1501 | &tcp_ctask->sent)) { | |
1502 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; | |
7ba24713 | 1503 | if (conn->datadgst_en) { |
5bb0b55a MC |
1504 | crypto_digest_final(tcp_conn->data_tx_tfm, |
1505 | (u8*)&tcp_ctask->immdigest); | |
7ba24713 | 1506 | debug_tcp("tx imm sendpage fail 0x%x\n", |
5bb0b55a | 1507 | tcp_ctask->datadigest); |
7ba24713 AA |
1508 | } |
1509 | return -EAGAIN; | |
1510 | } | |
1511 | if (conn->datadgst_en) | |
5bb0b55a MC |
1512 | crypto_digest_update(tcp_conn->data_tx_tfm, |
1513 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1514 | |
1515 | if (!ctask->imm_count) | |
1516 | break; | |
5bb0b55a MC |
1517 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1518 | &tcp_ctask->sg[tcp_ctask->sg_count++]); | |
7ba24713 AA |
1519 | } |
1520 | ||
5bb0b55a MC |
1521 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
1522 | if (iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, | |
1523 | &tcp_ctask->immdigest, 1)) { | |
7ba24713 | 1524 | debug_tcp("sending imm digest 0x%x fail!\n", |
5bb0b55a | 1525 | tcp_ctask->immdigest); |
7ba24713 AA |
1526 | return -EAGAIN; |
1527 | } | |
5bb0b55a | 1528 | debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest); |
7ba24713 AA |
1529 | } |
1530 | ||
1531 | return 0; | |
1532 | } | |
1533 | ||
1534 | static inline int | |
1535 | handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1536 | { | |
5bb0b55a | 1537 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1538 | struct iscsi_data_task *dtask; |
1539 | ||
5bb0b55a MC |
1540 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
1541 | if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { | |
7ba24713 | 1542 | iscsi_unsolicit_data_init(conn, ctask); |
5bb0b55a MC |
1543 | BUG_ON(!tcp_ctask->dtask); |
1544 | dtask = tcp_ctask->dtask; | |
af973481 | 1545 | if (conn->hdrdgst_en) |
5bb0b55a | 1546 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
af973481 | 1547 | (u8*)dtask->hdrext); |
5bb0b55a | 1548 | tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
7ba24713 | 1549 | } |
5bb0b55a MC |
1550 | if (iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count)) { |
1551 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; | |
1552 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR; | |
7ba24713 AA |
1553 | return -EAGAIN; |
1554 | } | |
1555 | ||
1556 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", | |
5bb0b55a | 1557 | ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
7ba24713 AA |
1558 | return 0; |
1559 | } | |
1560 | ||
1561 | static inline int | |
1562 | handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1563 | { | |
5bb0b55a MC |
1564 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1565 | struct iscsi_data_task *dtask = tcp_ctask->dtask; | |
1566 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 AA |
1567 | |
1568 | BUG_ON(!ctask->data_count); | |
5bb0b55a | 1569 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
7ba24713 AA |
1570 | |
1571 | if (conn->datadgst_en) { | |
5bb0b55a | 1572 | iscsi_data_digest_init(tcp_conn, ctask); |
7ba24713 AA |
1573 | dtask->digest = 0; |
1574 | } | |
1575 | ||
1576 | for (;;) { | |
5bb0b55a | 1577 | int start = tcp_ctask->sent; |
7ba24713 | 1578 | |
5bb0b55a MC |
1579 | if (iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
1580 | &ctask->data_count, &tcp_ctask->sent)) { | |
1581 | ctask->unsol_count -= tcp_ctask->sent - start; | |
1582 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; | |
7ba24713 AA |
1583 | /* will continue with this ctask later.. */ |
1584 | if (conn->datadgst_en) { | |
5bb0b55a | 1585 | crypto_digest_final(tcp_conn->data_tx_tfm, |
7ba24713 AA |
1586 | (u8 *)&dtask->digest); |
1587 | debug_tcp("tx uns data fail 0x%x\n", | |
1588 | dtask->digest); | |
1589 | } | |
1590 | return -EAGAIN; | |
1591 | } | |
1592 | ||
5bb0b55a MC |
1593 | BUG_ON(tcp_ctask->sent > ctask->total_length); |
1594 | ctask->unsol_count -= tcp_ctask->sent - start; | |
7ba24713 AA |
1595 | |
1596 | /* | |
1597 | * XXX:we may run here with un-initial sendbuf. | |
1598 | * so pass it | |
1599 | */ | |
5bb0b55a MC |
1600 | if (conn->datadgst_en && tcp_ctask->sent - start > 0) |
1601 | crypto_digest_update(tcp_conn->data_tx_tfm, | |
1602 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1603 | |
1604 | if (!ctask->data_count) | |
1605 | break; | |
5bb0b55a MC |
1606 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1607 | &tcp_ctask->sg[tcp_ctask->sg_count++]); | |
7ba24713 AA |
1608 | } |
1609 | BUG_ON(ctask->unsol_count < 0); | |
1610 | ||
1611 | /* | |
1612 | * Done with the Data-Out. Next, check if we need | |
1613 | * to send another unsolicited Data-Out. | |
1614 | */ | |
1615 | if (ctask->unsol_count) { | |
1616 | if (conn->datadgst_en) { | |
1617 | if (iscsi_digest_final_send(conn, ctask, | |
1618 | &dtask->digestbuf, | |
1619 | &dtask->digest, 1)) { | |
1620 | debug_tcp("send uns digest 0x%x fail\n", | |
1621 | dtask->digest); | |
1622 | return -EAGAIN; | |
1623 | } | |
1624 | debug_tcp("sending uns digest 0x%x, more uns\n", | |
1625 | dtask->digest); | |
1626 | } | |
5bb0b55a | 1627 | tcp_ctask->xmstate |= XMSTATE_UNS_INIT; |
7ba24713 AA |
1628 | return 1; |
1629 | } | |
1630 | ||
5bb0b55a | 1631 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
7ba24713 AA |
1632 | if (iscsi_digest_final_send(conn, ctask, |
1633 | &dtask->digestbuf, | |
1634 | &dtask->digest, 1)) { | |
1635 | debug_tcp("send last uns digest 0x%x fail\n", | |
1636 | dtask->digest); | |
1637 | return -EAGAIN; | |
1638 | } | |
1639 | debug_tcp("sending uns digest 0x%x\n",dtask->digest); | |
1640 | } | |
1641 | ||
1642 | return 0; | |
1643 | } | |
1644 | ||
1645 | static inline int | |
1646 | handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1647 | { | |
1648 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
1649 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1650 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1651 | struct iscsi_r2t_info *r2t = tcp_ctask->r2t; | |
7ba24713 AA |
1652 | struct iscsi_data_task *dtask = r2t->dtask; |
1653 | int left; | |
1654 | ||
5bb0b55a MC |
1655 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
1656 | tcp_ctask->dtask = dtask; | |
7ba24713 AA |
1657 | |
1658 | if (conn->datadgst_en) { | |
5bb0b55a | 1659 | iscsi_data_digest_init(tcp_conn, ctask); |
7ba24713 AA |
1660 | dtask->digest = 0; |
1661 | } | |
1662 | solicit_again: | |
1663 | /* | |
1664 | * send Data-Out whitnin this R2T sequence. | |
1665 | */ | |
1666 | if (!r2t->data_count) | |
1667 | goto data_out_done; | |
1668 | ||
1669 | if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) { | |
5bb0b55a | 1670 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
7ba24713 AA |
1671 | /* will continue with this ctask later.. */ |
1672 | if (conn->datadgst_en) { | |
5bb0b55a | 1673 | crypto_digest_final(tcp_conn->data_tx_tfm, |
7ba24713 AA |
1674 | (u8 *)&dtask->digest); |
1675 | debug_tcp("r2t data send fail 0x%x\n", dtask->digest); | |
1676 | } | |
1677 | return -EAGAIN; | |
1678 | } | |
1679 | ||
1680 | BUG_ON(r2t->data_count < 0); | |
1681 | if (conn->datadgst_en) | |
5bb0b55a MC |
1682 | crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg, |
1683 | 1); | |
7ba24713 AA |
1684 | |
1685 | if (r2t->data_count) { | |
1686 | BUG_ON(ctask->sc->use_sg == 0); | |
1687 | if (!iscsi_buf_left(&r2t->sendbuf)) { | |
5bb0b55a | 1688 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
7ba24713 AA |
1689 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1690 | r2t->sg += 1; | |
1691 | } | |
1692 | goto solicit_again; | |
1693 | } | |
1694 | ||
1695 | data_out_done: | |
1696 | /* | |
1697 | * Done with this Data-Out. Next, check if we have | |
1698 | * to send another Data-Out for this R2T. | |
1699 | */ | |
1700 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1701 | left = r2t->data_length - r2t->sent; | |
1702 | if (left) { | |
1703 | if (conn->datadgst_en) { | |
1704 | if (iscsi_digest_final_send(conn, ctask, | |
1705 | &dtask->digestbuf, | |
1706 | &dtask->digest, 1)) { | |
1707 | debug_tcp("send r2t data digest 0x%x" | |
1708 | "fail\n", dtask->digest); | |
1709 | return -EAGAIN; | |
1710 | } | |
1711 | debug_tcp("r2t data send digest 0x%x\n", | |
1712 | dtask->digest); | |
1713 | } | |
1714 | iscsi_solicit_data_cont(conn, ctask, r2t, left); | |
5bb0b55a MC |
1715 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
1716 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
7ba24713 AA |
1717 | return 1; |
1718 | } | |
1719 | ||
1720 | /* | |
1721 | * Done with this R2T. Check if there are more | |
1722 | * outstanding R2Ts ready to be processed. | |
1723 | */ | |
5bb0b55a | 1724 | BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0); |
7ba24713 AA |
1725 | if (conn->datadgst_en) { |
1726 | if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, | |
1727 | &dtask->digest, 1)) { | |
1728 | debug_tcp("send last r2t data digest 0x%x" | |
1729 | "fail\n", dtask->digest); | |
1730 | return -EAGAIN; | |
1731 | } | |
1732 | debug_tcp("r2t done dout digest 0x%x\n", dtask->digest); | |
1733 | } | |
1734 | ||
5bb0b55a MC |
1735 | tcp_ctask->r2t_data_count -= r2t->data_length; |
1736 | tcp_ctask->r2t = NULL; | |
7ba24713 | 1737 | spin_lock_bh(&session->lock); |
5bb0b55a | 1738 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 | 1739 | spin_unlock_bh(&session->lock); |
5bb0b55a MC |
1740 | if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { |
1741 | tcp_ctask->r2t = r2t; | |
1742 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
1743 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
7ba24713 AA |
1744 | return 1; |
1745 | } | |
1746 | ||
1747 | return 0; | |
1748 | } | |
1749 | ||
1750 | static inline int | |
1751 | handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1752 | { | |
5bb0b55a MC |
1753 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1754 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1755 | struct iscsi_data_task *dtask = tcp_ctask->dtask; | |
7ba24713 AA |
1756 | int sent; |
1757 | ||
5bb0b55a MC |
1758 | tcp_ctask->xmstate &= ~XMSTATE_W_PAD; |
1759 | iscsi_buf_init_virt(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, | |
1760 | tcp_ctask->pad_count); | |
1761 | if (iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, | |
1762 | &sent)) { | |
1763 | tcp_ctask->xmstate |= XMSTATE_W_PAD; | |
7ba24713 AA |
1764 | return -EAGAIN; |
1765 | } | |
1766 | ||
1767 | if (conn->datadgst_en) { | |
5bb0b55a MC |
1768 | crypto_digest_update(tcp_conn->data_tx_tfm, |
1769 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1770 | /* imm data? */ |
1771 | if (!dtask) { | |
5bb0b55a MC |
1772 | if (iscsi_digest_final_send(conn, ctask, |
1773 | &tcp_ctask->immbuf, | |
1774 | &tcp_ctask->immdigest, 1)) { | |
7ba24713 | 1775 | debug_tcp("send padding digest 0x%x" |
5bb0b55a | 1776 | "fail!\n", tcp_ctask->immdigest); |
7ba24713 AA |
1777 | return -EAGAIN; |
1778 | } | |
1779 | debug_tcp("done with padding, digest 0x%x\n", | |
5bb0b55a | 1780 | tcp_ctask->datadigest); |
7ba24713 AA |
1781 | } else { |
1782 | if (iscsi_digest_final_send(conn, ctask, | |
1783 | &dtask->digestbuf, | |
1784 | &dtask->digest, 1)) { | |
1785 | debug_tcp("send padding digest 0x%x" | |
1786 | "fail\n", dtask->digest); | |
1787 | return -EAGAIN; | |
1788 | } | |
1789 | debug_tcp("done with padding, digest 0x%x\n", | |
1790 | dtask->digest); | |
1791 | } | |
1792 | } | |
1793 | ||
1794 | return 0; | |
1795 | } | |
1796 | ||
1797 | static int | |
5bb0b55a | 1798 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 1799 | { |
5bb0b55a | 1800 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1801 | int rc = 0; |
1802 | ||
1803 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", | |
5bb0b55a | 1804 | conn->id, tcp_ctask->xmstate, ctask->itt); |
7ba24713 AA |
1805 | |
1806 | /* | |
1807 | * serialize with TMF AbortTask | |
1808 | */ | |
1809 | if (ctask->mtask) | |
1810 | return rc; | |
1811 | ||
5bb0b55a MC |
1812 | if (tcp_ctask->xmstate & XMSTATE_R_HDR) { |
1813 | rc = handle_xmstate_r_hdr(conn, tcp_ctask); | |
7ba24713 AA |
1814 | return rc; |
1815 | } | |
1816 | ||
5bb0b55a | 1817 | if (tcp_ctask->xmstate & XMSTATE_W_HDR) { |
7ba24713 AA |
1818 | rc = handle_xmstate_w_hdr(conn, ctask); |
1819 | if (rc) | |
1820 | return rc; | |
1821 | } | |
1822 | ||
1823 | /* XXX: for data digest xmit recover */ | |
5bb0b55a | 1824 | if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) { |
7ba24713 AA |
1825 | rc = handle_xmstate_data_digest(conn, ctask); |
1826 | if (rc) | |
1827 | return rc; | |
1828 | } | |
1829 | ||
5bb0b55a | 1830 | if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 AA |
1831 | rc = handle_xmstate_imm_data(conn, ctask); |
1832 | if (rc) | |
1833 | return rc; | |
1834 | } | |
1835 | ||
5bb0b55a | 1836 | if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
7ba24713 | 1837 | BUG_ON(!ctask->unsol_count); |
5bb0b55a | 1838 | tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; |
7ba24713 AA |
1839 | unsolicit_head_again: |
1840 | rc = handle_xmstate_uns_hdr(conn, ctask); | |
1841 | if (rc) | |
1842 | return rc; | |
1843 | } | |
1844 | ||
5bb0b55a | 1845 | if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
7ba24713 AA |
1846 | rc = handle_xmstate_uns_data(conn, ctask); |
1847 | if (rc == 1) | |
1848 | goto unsolicit_head_again; | |
1849 | else if (rc) | |
1850 | return rc; | |
1851 | goto done; | |
1852 | } | |
1853 | ||
5bb0b55a | 1854 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { |
7ba24713 AA |
1855 | struct iscsi_r2t_info *r2t; |
1856 | ||
5bb0b55a MC |
1857 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
1858 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
1859 | if (!tcp_ctask->r2t) | |
1860 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, | |
7ba24713 AA |
1861 | sizeof(void*)); |
1862 | solicit_head_again: | |
5bb0b55a | 1863 | r2t = tcp_ctask->r2t; |
af973481 | 1864 | if (conn->hdrdgst_en) |
42f72aa9 | 1865 | iscsi_hdr_digest(conn, &r2t->headbuf, |
af973481 | 1866 | (u8*)r2t->dtask->hdrext); |
7ba24713 | 1867 | if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) { |
5bb0b55a MC |
1868 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
1869 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
7ba24713 AA |
1870 | return -EAGAIN; |
1871 | } | |
1872 | ||
1873 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", | |
1874 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, | |
1875 | r2t->sent); | |
1876 | } | |
1877 | ||
5bb0b55a | 1878 | if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
7ba24713 AA |
1879 | rc = handle_xmstate_sol_data(conn, ctask); |
1880 | if (rc == 1) | |
1881 | goto solicit_head_again; | |
1882 | if (rc) | |
1883 | return rc; | |
1884 | } | |
1885 | ||
1886 | done: | |
1887 | /* | |
1888 | * Last thing to check is whether we need to send write | |
1889 | * padding. Note that we check for xmstate equality, not just the bit. | |
1890 | */ | |
5bb0b55a | 1891 | if (tcp_ctask->xmstate == XMSTATE_W_PAD) |
7ba24713 AA |
1892 | rc = handle_xmstate_w_pad(conn, ctask); |
1893 | ||
1894 | return rc; | |
1895 | } | |
1896 | ||
5bb0b55a MC |
1897 | static struct iscsi_cls_conn * |
1898 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1899 | { |
5bb0b55a MC |
1900 | struct iscsi_conn *conn; |
1901 | struct iscsi_cls_conn *cls_conn; | |
1902 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1903 | |
5bb0b55a MC |
1904 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
1905 | if (!cls_conn) | |
1906 | return NULL; | |
1907 | conn = cls_conn->dd_data; | |
7ba24713 | 1908 | /* |
5bb0b55a MC |
1909 | * due to strange issues with iser these are not set |
1910 | * in iscsi_conn_setup | |
7ba24713 | 1911 | */ |
5bb0b55a | 1912 | conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; |
7ba24713 | 1913 | |
5bb0b55a MC |
1914 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
1915 | if (!tcp_conn) | |
1916 | goto tcp_conn_alloc_fail; | |
7ba24713 | 1917 | |
5bb0b55a MC |
1918 | conn->dd_data = tcp_conn; |
1919 | tcp_conn->iscsi_conn = conn; | |
1920 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
1921 | /* initial operational parameters */ | |
1922 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); | |
1923 | tcp_conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; | |
7ba24713 | 1924 | |
5bb0b55a MC |
1925 | /* allocate initial PDU receive place holder */ |
1926 | if (tcp_conn->data_size <= PAGE_SIZE) | |
1927 | tcp_conn->data = kmalloc(tcp_conn->data_size, GFP_KERNEL); | |
1928 | else | |
1929 | tcp_conn->data = (void*)__get_free_pages(GFP_KERNEL, | |
1930 | get_order(tcp_conn->data_size)); | |
1931 | if (!tcp_conn->data) | |
1932 | goto max_recv_dlenght_alloc_fail; | |
7ba24713 | 1933 | |
5bb0b55a | 1934 | return cls_conn; |
7ba24713 | 1935 | |
5bb0b55a MC |
1936 | max_recv_dlenght_alloc_fail: |
1937 | kfree(tcp_conn); | |
1938 | tcp_conn_alloc_fail: | |
1939 | iscsi_conn_teardown(cls_conn); | |
1940 | return NULL; | |
7ba24713 AA |
1941 | } |
1942 | ||
1943 | static void | |
5bb0b55a | 1944 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1945 | { |
5bb0b55a MC |
1946 | struct iscsi_conn *conn = cls_conn->dd_data; |
1947 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1948 | int digest = 0; | |
7ba24713 | 1949 | |
5bb0b55a MC |
1950 | if (conn->hdrdgst_en || conn->datadgst_en) |
1951 | digest = 1; | |
7ba24713 | 1952 | |
5bb0b55a | 1953 | iscsi_conn_teardown(cls_conn); |
7ba24713 | 1954 | |
5bb0b55a MC |
1955 | /* now free tcp_conn */ |
1956 | if (digest) { | |
1957 | if (tcp_conn->tx_tfm) | |
1958 | crypto_free_tfm(tcp_conn->tx_tfm); | |
1959 | if (tcp_conn->rx_tfm) | |
1960 | crypto_free_tfm(tcp_conn->rx_tfm); | |
1961 | if (tcp_conn->data_tx_tfm) | |
1962 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
1963 | if (tcp_conn->data_rx_tfm) | |
1964 | crypto_free_tfm(tcp_conn->data_rx_tfm); | |
1965 | } | |
7ba24713 | 1966 | |
5bb0b55a MC |
1967 | /* free conn->data, size = MaxRecvDataSegmentLength */ |
1968 | if (tcp_conn->data_size <= PAGE_SIZE) | |
1969 | kfree(tcp_conn->data); | |
1970 | else | |
1971 | free_pages((unsigned long)tcp_conn->data, | |
1972 | get_order(tcp_conn->data_size)); | |
1973 | kfree(tcp_conn); | |
1974 | } | |
7ba24713 | 1975 | |
5bb0b55a MC |
1976 | static int |
1977 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1978 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1979 | int is_leading) |
1980 | { | |
1981 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1982 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1983 | struct sock *sk; | |
1984 | struct socket *sock; | |
1985 | int err; | |
7ba24713 | 1986 | |
5bb0b55a | 1987 | /* lookup for existing socket */ |
264faaaa | 1988 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a MC |
1989 | if (!sock) { |
1990 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); | |
1991 | return -EEXIST; | |
7ba24713 AA |
1992 | } |
1993 | ||
5bb0b55a MC |
1994 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
1995 | if (err) | |
1996 | return err; | |
7ba24713 | 1997 | |
5bb0b55a MC |
1998 | if (conn->stop_stage != STOP_CONN_SUSPEND) { |
1999 | /* bind iSCSI connection and socket */ | |
2000 | tcp_conn->sock = sock; | |
7ba24713 AA |
2001 | |
2002 | /* setup Socket parameters */ | |
2003 | sk = sock->sk; | |
2004 | sk->sk_reuse = 1; | |
2005 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
2006 | sk->sk_allocation = GFP_ATOMIC; | |
2007 | ||
2008 | /* FIXME: disable Nagle's algorithm */ | |
2009 | ||
2010 | /* | |
2011 | * Intercept TCP callbacks for sendfile like receive | |
2012 | * processing. | |
2013 | */ | |
5bb0b55a | 2014 | conn->recv_lock = &sk->sk_callback_lock; |
7ba24713 | 2015 | iscsi_conn_set_callbacks(conn); |
5bb0b55a | 2016 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; |
7ba24713 AA |
2017 | /* |
2018 | * set receive state machine into initial state | |
2019 | */ | |
5bb0b55a | 2020 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
7ba24713 AA |
2021 | } |
2022 | ||
7ba24713 AA |
2023 | return 0; |
2024 | } | |
2025 | ||
30a6c652 | 2026 | static void |
5bb0b55a | 2027 | iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
30a6c652 | 2028 | { |
5bb0b55a | 2029 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
30a6c652 | 2030 | struct iscsi_r2t_info *r2t; |
30a6c652 MC |
2031 | |
2032 | /* flush ctask's r2t queues */ | |
5bb0b55a MC |
2033 | while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) |
2034 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
30a6c652 | 2035 | sizeof(void*)); |
30a6c652 | 2036 | |
5bb0b55a | 2037 | __iscsi_ctask_cleanup(conn, ctask); |
30a6c652 MC |
2038 | } |
2039 | ||
2040 | static void | |
5bb0b55a | 2041 | iscsi_tcp_suspend_conn_rx(struct iscsi_conn *conn) |
30a6c652 | 2042 | { |
5bb0b55a | 2043 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 2044 | struct sock *sk; |
7ba24713 | 2045 | |
5bb0b55a MC |
2046 | if (!tcp_conn->sock) |
2047 | return; | |
2048 | ||
2049 | sk = tcp_conn->sock->sk; | |
7ba24713 | 2050 | write_lock_bh(&sk->sk_callback_lock); |
5bb0b55a | 2051 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); |
7ba24713 | 2052 | write_unlock_bh(&sk->sk_callback_lock); |
30a6c652 | 2053 | } |
7ba24713 | 2054 | |
30a6c652 | 2055 | static void |
5bb0b55a | 2056 | iscsi_tcp_terminate_conn(struct iscsi_conn *conn) |
30a6c652 | 2057 | { |
5bb0b55a | 2058 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 2059 | |
5bb0b55a MC |
2060 | if (!tcp_conn->sock) |
2061 | return; | |
7ba24713 | 2062 | |
5bb0b55a | 2063 | sock_hold(tcp_conn->sock->sk); |
30a6c652 | 2064 | iscsi_conn_restore_callbacks(conn); |
5bb0b55a | 2065 | sock_put(tcp_conn->sock->sk); |
7ba24713 | 2066 | |
5bb0b55a MC |
2067 | sock_release(tcp_conn->sock); |
2068 | tcp_conn->sock = NULL; | |
2069 | conn->recv_lock = NULL; | |
7ba24713 AA |
2070 | } |
2071 | ||
5bb0b55a | 2072 | /* called with host lock */ |
30a6c652 | 2073 | static void |
5bb0b55a MC |
2074 | iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask, |
2075 | char *data, uint32_t data_size) | |
7ba24713 | 2076 | { |
5bb0b55a | 2077 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
7ba24713 | 2078 | |
5bb0b55a | 2079 | iscsi_buf_init_virt(&tcp_mtask->headbuf, (char*)mtask->hdr, |
7ba24713 | 2080 | sizeof(struct iscsi_hdr)); |
5bb0b55a | 2081 | tcp_mtask->xmstate = XMSTATE_IMM_HDR; |
7ba24713 | 2082 | |
5bb0b55a MC |
2083 | if (mtask->data_count) |
2084 | iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data, | |
7ba24713 | 2085 | mtask->data_count); |
7ba24713 AA |
2086 | } |
2087 | ||
2088 | static int | |
2089 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
2090 | { | |
2091 | int i; | |
2092 | int cmd_i; | |
2093 | ||
2094 | /* | |
2095 | * initialize per-task: R2T pool and xmit queue | |
2096 | */ | |
2097 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2098 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
5bb0b55a | 2099 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
2100 | |
2101 | /* | |
2102 | * pre-allocated x4 as much r2ts to handle race when | |
2103 | * target acks DataOut faster than we data_xmit() queues | |
2104 | * could replenish r2tqueue. | |
2105 | */ | |
2106 | ||
2107 | /* R2T pool */ | |
5bb0b55a MC |
2108 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
2109 | (void***)&tcp_ctask->r2ts, | |
2110 | sizeof(struct iscsi_r2t_info))) { | |
7ba24713 AA |
2111 | goto r2t_alloc_fail; |
2112 | } | |
2113 | ||
2114 | /* R2T xmit queue */ | |
5bb0b55a | 2115 | tcp_ctask->r2tqueue = kfifo_alloc( |
7ba24713 | 2116 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
5bb0b55a MC |
2117 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
2118 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2119 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2120 | goto r2t_alloc_fail; |
2121 | } | |
2122 | ||
2123 | /* | |
2124 | * number of | |
2125 | * Data-Out PDU's within R2T-sequence can be quite big; | |
2126 | * using mempool | |
2127 | */ | |
5bb0b55a MC |
2128 | tcp_ctask->datapool = mempool_create_slab_pool(ISCSI_DTASK_DEFAULT_MAX, |
2129 | taskcache); | |
2130 | if (tcp_ctask->datapool == NULL) { | |
2131 | kfifo_free(tcp_ctask->r2tqueue); | |
2132 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2133 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2134 | goto r2t_alloc_fail; |
2135 | } | |
5bb0b55a | 2136 | INIT_LIST_HEAD(&tcp_ctask->dataqueue); |
7ba24713 AA |
2137 | } |
2138 | ||
2139 | return 0; | |
2140 | ||
2141 | r2t_alloc_fail: | |
2142 | for (i = 0; i < cmd_i; i++) { | |
5bb0b55a MC |
2143 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2144 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2145 | ||
2146 | mempool_destroy(tcp_ctask->datapool); | |
2147 | kfifo_free(tcp_ctask->r2tqueue); | |
2148 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2149 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2150 | } |
2151 | return -ENOMEM; | |
2152 | } | |
2153 | ||
2154 | static void | |
2155 | iscsi_r2tpool_free(struct iscsi_session *session) | |
2156 | { | |
2157 | int i; | |
2158 | ||
2159 | for (i = 0; i < session->cmds_max; i++) { | |
5bb0b55a MC |
2160 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2161 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 2162 | |
5bb0b55a MC |
2163 | mempool_destroy(tcp_ctask->datapool); |
2164 | kfifo_free(tcp_ctask->r2tqueue); | |
2165 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2166 | (void**)tcp_ctask->r2ts); | |
7ba24713 | 2167 | } |
7ba24713 AA |
2168 | } |
2169 | ||
2170 | static int | |
7b7232f3 | 2171 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
7ba24713 AA |
2172 | uint32_t value) |
2173 | { | |
7b7232f3 | 2174 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 2175 | struct iscsi_session *session = conn->session; |
5bb0b55a | 2176 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 2177 | |
7ba24713 AA |
2178 | switch(param) { |
2179 | case ISCSI_PARAM_MAX_RECV_DLENGTH: { | |
5bb0b55a | 2180 | char *saveptr = tcp_conn->data; |
b53cb2a4 | 2181 | gfp_t flags = GFP_KERNEL; |
7ba24713 | 2182 | |
5bb0b55a | 2183 | if (tcp_conn->data_size >= value) { |
7ba24713 AA |
2184 | conn->max_recv_dlength = value; |
2185 | break; | |
2186 | } | |
2187 | ||
2188 | spin_lock_bh(&session->lock); | |
2189 | if (conn->stop_stage == STOP_CONN_RECOVER) | |
2190 | flags = GFP_ATOMIC; | |
2191 | spin_unlock_bh(&session->lock); | |
2192 | ||
2193 | if (value <= PAGE_SIZE) | |
5bb0b55a | 2194 | tcp_conn->data = kmalloc(value, flags); |
7ba24713 | 2195 | else |
5bb0b55a | 2196 | tcp_conn->data = (void*)__get_free_pages(flags, |
7ba24713 | 2197 | get_order(value)); |
5bb0b55a MC |
2198 | if (tcp_conn->data == NULL) { |
2199 | tcp_conn->data = saveptr; | |
7ba24713 AA |
2200 | return -ENOMEM; |
2201 | } | |
5bb0b55a | 2202 | if (tcp_conn->data_size <= PAGE_SIZE) |
7ba24713 AA |
2203 | kfree(saveptr); |
2204 | else | |
2205 | free_pages((unsigned long)saveptr, | |
5bb0b55a | 2206 | get_order(tcp_conn->data_size)); |
7ba24713 | 2207 | conn->max_recv_dlength = value; |
5bb0b55a | 2208 | tcp_conn->data_size = value; |
7ba24713 AA |
2209 | } |
2210 | break; | |
2211 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2212 | conn->max_xmit_dlength = value; | |
2213 | break; | |
2214 | case ISCSI_PARAM_HDRDGST_EN: | |
2215 | conn->hdrdgst_en = value; | |
5bb0b55a | 2216 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
7ba24713 | 2217 | if (conn->hdrdgst_en) { |
5bb0b55a MC |
2218 | tcp_conn->hdr_size += sizeof(__u32); |
2219 | if (!tcp_conn->tx_tfm) | |
2220 | tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c", | |
2221 | 0); | |
2222 | if (!tcp_conn->tx_tfm) | |
7ba24713 | 2223 | return -ENOMEM; |
5bb0b55a MC |
2224 | if (!tcp_conn->rx_tfm) |
2225 | tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c", | |
2226 | 0); | |
2227 | if (!tcp_conn->rx_tfm) { | |
2228 | crypto_free_tfm(tcp_conn->tx_tfm); | |
7ba24713 AA |
2229 | return -ENOMEM; |
2230 | } | |
2231 | } else { | |
5bb0b55a MC |
2232 | if (tcp_conn->tx_tfm) |
2233 | crypto_free_tfm(tcp_conn->tx_tfm); | |
2234 | if (tcp_conn->rx_tfm) | |
2235 | crypto_free_tfm(tcp_conn->rx_tfm); | |
7ba24713 AA |
2236 | } |
2237 | break; | |
2238 | case ISCSI_PARAM_DATADGST_EN: | |
2239 | conn->datadgst_en = value; | |
2240 | if (conn->datadgst_en) { | |
5bb0b55a MC |
2241 | if (!tcp_conn->data_tx_tfm) |
2242 | tcp_conn->data_tx_tfm = | |
7ba24713 | 2243 | crypto_alloc_tfm("crc32c", 0); |
5bb0b55a | 2244 | if (!tcp_conn->data_tx_tfm) |
7ba24713 | 2245 | return -ENOMEM; |
5bb0b55a MC |
2246 | if (!tcp_conn->data_rx_tfm) |
2247 | tcp_conn->data_rx_tfm = | |
7ba24713 | 2248 | crypto_alloc_tfm("crc32c", 0); |
5bb0b55a MC |
2249 | if (!tcp_conn->data_rx_tfm) { |
2250 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
7ba24713 AA |
2251 | return -ENOMEM; |
2252 | } | |
2253 | } else { | |
5bb0b55a MC |
2254 | if (tcp_conn->data_tx_tfm) |
2255 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
2256 | if (tcp_conn->data_rx_tfm) | |
2257 | crypto_free_tfm(tcp_conn->data_rx_tfm); | |
7ba24713 | 2258 | } |
5bb0b55a MC |
2259 | tcp_conn->sendpage = conn->datadgst_en ? |
2260 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 AA |
2261 | break; |
2262 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2263 | session->initial_r2t_en = value; | |
2264 | break; | |
2265 | case ISCSI_PARAM_MAX_R2T: | |
2266 | if (session->max_r2t == roundup_pow_of_two(value)) | |
2267 | break; | |
2268 | iscsi_r2tpool_free(session); | |
2269 | session->max_r2t = value; | |
2270 | if (session->max_r2t & (session->max_r2t - 1)) | |
2271 | session->max_r2t = roundup_pow_of_two(session->max_r2t); | |
2272 | if (iscsi_r2tpool_alloc(session)) | |
2273 | return -ENOMEM; | |
2274 | break; | |
2275 | case ISCSI_PARAM_IMM_DATA_EN: | |
2276 | session->imm_data_en = value; | |
2277 | break; | |
2278 | case ISCSI_PARAM_FIRST_BURST: | |
2279 | session->first_burst = value; | |
2280 | break; | |
2281 | case ISCSI_PARAM_MAX_BURST: | |
2282 | session->max_burst = value; | |
2283 | break; | |
2284 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2285 | session->pdu_inorder_en = value; | |
2286 | break; | |
2287 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2288 | session->dataseq_inorder_en = value; | |
2289 | break; | |
2290 | case ISCSI_PARAM_ERL: | |
2291 | session->erl = value; | |
2292 | break; | |
2293 | case ISCSI_PARAM_IFMARKER_EN: | |
2294 | BUG_ON(value); | |
2295 | session->ifmarker_en = value; | |
2296 | break; | |
2297 | case ISCSI_PARAM_OFMARKER_EN: | |
2298 | BUG_ON(value); | |
2299 | session->ofmarker_en = value; | |
2300 | break; | |
2301 | default: | |
2302 | break; | |
2303 | } | |
2304 | ||
2305 | return 0; | |
2306 | } | |
2307 | ||
2308 | static int | |
7b7232f3 | 2309 | iscsi_session_get_param(struct iscsi_cls_session *cls_session, |
7b8631b5 | 2310 | enum iscsi_param param, uint32_t *value) |
7ba24713 | 2311 | { |
7b7232f3 | 2312 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
7b8631b5 | 2313 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); |
7ba24713 AA |
2314 | |
2315 | switch(param) { | |
7ba24713 AA |
2316 | case ISCSI_PARAM_INITIAL_R2T_EN: |
2317 | *value = session->initial_r2t_en; | |
2318 | break; | |
2319 | case ISCSI_PARAM_MAX_R2T: | |
2320 | *value = session->max_r2t; | |
2321 | break; | |
2322 | case ISCSI_PARAM_IMM_DATA_EN: | |
2323 | *value = session->imm_data_en; | |
2324 | break; | |
2325 | case ISCSI_PARAM_FIRST_BURST: | |
2326 | *value = session->first_burst; | |
2327 | break; | |
2328 | case ISCSI_PARAM_MAX_BURST: | |
2329 | *value = session->max_burst; | |
2330 | break; | |
2331 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2332 | *value = session->pdu_inorder_en; | |
2333 | break; | |
2334 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2335 | *value = session->dataseq_inorder_en; | |
2336 | break; | |
2337 | case ISCSI_PARAM_ERL: | |
2338 | *value = session->erl; | |
2339 | break; | |
2340 | case ISCSI_PARAM_IFMARKER_EN: | |
2341 | *value = session->ifmarker_en; | |
2342 | break; | |
2343 | case ISCSI_PARAM_OFMARKER_EN: | |
2344 | *value = session->ofmarker_en; | |
2345 | break; | |
2346 | default: | |
fd7255f5 | 2347 | return -EINVAL; |
7ba24713 AA |
2348 | } |
2349 | ||
2350 | return 0; | |
2351 | } | |
2352 | ||
7b8631b5 | 2353 | static int |
7b7232f3 MC |
2354 | iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
2355 | enum iscsi_param param, uint32_t *value) | |
7b8631b5 | 2356 | { |
7b7232f3 | 2357 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2358 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
fd7255f5 | 2359 | struct inet_sock *inet; |
7b8631b5 MC |
2360 | |
2361 | switch(param) { | |
2362 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
2363 | *value = conn->max_recv_dlength; | |
2364 | break; | |
2365 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2366 | *value = conn->max_xmit_dlength; | |
2367 | break; | |
2368 | case ISCSI_PARAM_HDRDGST_EN: | |
2369 | *value = conn->hdrdgst_en; | |
2370 | break; | |
2371 | case ISCSI_PARAM_DATADGST_EN: | |
2372 | *value = conn->datadgst_en; | |
2373 | break; | |
fd7255f5 MC |
2374 | case ISCSI_PARAM_CONN_PORT: |
2375 | mutex_lock(&conn->xmitmutex); | |
5bb0b55a | 2376 | if (!tcp_conn->sock) { |
fd7255f5 MC |
2377 | mutex_unlock(&conn->xmitmutex); |
2378 | return -EINVAL; | |
2379 | } | |
2380 | ||
5bb0b55a | 2381 | inet = inet_sk(tcp_conn->sock->sk); |
fd7255f5 MC |
2382 | *value = be16_to_cpu(inet->dport); |
2383 | mutex_unlock(&conn->xmitmutex); | |
7b8631b5 | 2384 | default: |
fd7255f5 | 2385 | return -EINVAL; |
7b8631b5 MC |
2386 | } |
2387 | ||
2388 | return 0; | |
2389 | } | |
2390 | ||
fd7255f5 MC |
2391 | static int |
2392 | iscsi_conn_get_str_param(struct iscsi_cls_conn *cls_conn, | |
2393 | enum iscsi_param param, char *buf) | |
2394 | { | |
2395 | struct iscsi_conn *conn = cls_conn->dd_data; | |
5bb0b55a | 2396 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
fd7255f5 MC |
2397 | struct sock *sk; |
2398 | struct inet_sock *inet; | |
2399 | struct ipv6_pinfo *np; | |
2400 | int len = 0; | |
2401 | ||
2402 | switch (param) { | |
2403 | case ISCSI_PARAM_CONN_ADDRESS: | |
2404 | mutex_lock(&conn->xmitmutex); | |
5bb0b55a | 2405 | if (!tcp_conn->sock) { |
fd7255f5 MC |
2406 | mutex_unlock(&conn->xmitmutex); |
2407 | return -EINVAL; | |
2408 | } | |
2409 | ||
5bb0b55a | 2410 | sk = tcp_conn->sock->sk; |
fd7255f5 MC |
2411 | if (sk->sk_family == PF_INET) { |
2412 | inet = inet_sk(sk); | |
2413 | len = sprintf(buf, "%u.%u.%u.%u\n", | |
2414 | NIPQUAD(inet->daddr)); | |
2415 | } else { | |
2416 | np = inet6_sk(sk); | |
2417 | len = sprintf(buf, | |
2418 | "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
2419 | NIP6(np->daddr)); | |
2420 | } | |
2421 | mutex_unlock(&conn->xmitmutex); | |
2422 | break; | |
2423 | default: | |
2424 | return -EINVAL; | |
2425 | } | |
2426 | ||
2427 | return len; | |
2428 | } | |
2429 | ||
7ba24713 | 2430 | static void |
7b7232f3 | 2431 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 2432 | { |
7b7232f3 | 2433 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2434 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
2435 | |
2436 | stats->txdata_octets = conn->txdata_octets; | |
2437 | stats->rxdata_octets = conn->rxdata_octets; | |
2438 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
2439 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
2440 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
2441 | stats->datain_pdus = conn->datain_pdus_cnt; | |
2442 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
2443 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
2444 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
2445 | stats->custom_length = 3; | |
2446 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 2447 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 2448 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 2449 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
2450 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
2451 | stats->custom[2].value = conn->eh_abort_cnt; | |
2452 | } | |
2453 | ||
5bb0b55a MC |
2454 | static struct iscsi_cls_session * |
2455 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, | |
2456 | struct scsi_transport_template *scsit, | |
2457 | uint32_t initial_cmdsn, uint32_t *hostno) | |
7ba24713 | 2458 | { |
5bb0b55a MC |
2459 | struct iscsi_cls_session *cls_session; |
2460 | struct iscsi_session *session; | |
2461 | uint32_t hn; | |
2462 | int cmd_i; | |
7ba24713 | 2463 | |
5bb0b55a MC |
2464 | cls_session = iscsi_session_setup(iscsit, scsit, |
2465 | sizeof(struct iscsi_tcp_cmd_task), | |
2466 | sizeof(struct iscsi_tcp_mgmt_task), | |
2467 | initial_cmdsn, &hn); | |
2468 | if (!cls_session) | |
2469 | return NULL; | |
2470 | *hostno = hn; | |
7ba24713 | 2471 | |
5bb0b55a MC |
2472 | session = class_to_transport_session(cls_session); |
2473 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2474 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
2475 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2476 | ||
2477 | ctask->hdr = &tcp_ctask->hdr; | |
2478 | } | |
2479 | ||
2480 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
2481 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
2482 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
2483 | ||
2484 | mtask->hdr = &tcp_mtask->hdr; | |
2485 | } | |
2486 | ||
2487 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) | |
2488 | goto r2tpool_alloc_fail; | |
2489 | ||
2490 | return cls_session; | |
2491 | ||
2492 | r2tpool_alloc_fail: | |
2493 | iscsi_session_teardown(cls_session); | |
2494 | return NULL; | |
2495 | } | |
2496 | ||
2497 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
2498 | { | |
2499 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
2500 | struct iscsi_data_task *dtask, *n; | |
2501 | int cmd_i; | |
2502 | ||
2503 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2504 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
2505 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2506 | ||
2507 | list_for_each_entry_safe(dtask, n, &tcp_ctask->dataqueue, | |
2508 | item) { | |
2509 | list_del(&dtask->item); | |
2510 | mempool_free(dtask, tcp_ctask->datapool); | |
2511 | } | |
2512 | } | |
2513 | ||
2514 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); | |
2515 | iscsi_session_teardown(cls_session); | |
7ba24713 AA |
2516 | } |
2517 | ||
5bb0b55a MC |
2518 | static struct scsi_host_template iscsi_sht = { |
2519 | .name = "iSCSI Initiator over TCP/IP, v." | |
2520 | ISCSI_VERSION_STR, | |
2521 | .queuecommand = iscsi_queuecommand, | |
2522 | .change_queue_depth = iscsi_change_queue_depth, | |
2523 | .can_queue = ISCSI_XMIT_CMDS_MAX - 1, | |
2524 | .sg_tablesize = ISCSI_SG_TABLESIZE, | |
2525 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, | |
2526 | .eh_abort_handler = iscsi_eh_abort, | |
2527 | .eh_host_reset_handler = iscsi_eh_host_reset, | |
2528 | .use_clustering = DISABLE_CLUSTERING, | |
2529 | .proc_name = "iscsi_tcp", | |
2530 | .this_id = -1, | |
2531 | }; | |
2532 | ||
7ba24713 AA |
2533 | static struct iscsi_transport iscsi_tcp_transport = { |
2534 | .owner = THIS_MODULE, | |
2535 | .name = "tcp", | |
2536 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
2537 | | CAP_DATADGST, | |
fd7255f5 MC |
2538 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
2539 | ISCSI_MAX_XMIT_DLENGTH | | |
2540 | ISCSI_HDRDGST_EN | | |
2541 | ISCSI_DATADGST_EN | | |
2542 | ISCSI_INITIAL_R2T_EN | | |
2543 | ISCSI_MAX_R2T | | |
2544 | ISCSI_IMM_DATA_EN | | |
2545 | ISCSI_FIRST_BURST | | |
2546 | ISCSI_MAX_BURST | | |
2547 | ISCSI_PDU_INORDER_EN | | |
2548 | ISCSI_DATASEQ_INORDER_EN | | |
2549 | ISCSI_ERL | | |
2550 | ISCSI_CONN_PORT | | |
2551 | ISCSI_CONN_ADDRESS, | |
7ba24713 | 2552 | .host_template = &iscsi_sht, |
7b8631b5 | 2553 | .conndata_size = sizeof(struct iscsi_conn), |
7ba24713 AA |
2554 | .max_conn = 1, |
2555 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, | |
5bb0b55a MC |
2556 | /* session management */ |
2557 | .create_session = iscsi_tcp_session_create, | |
2558 | .destroy_session = iscsi_tcp_session_destroy, | |
2559 | /* connection management */ | |
2560 | .create_conn = iscsi_tcp_conn_create, | |
2561 | .bind_conn = iscsi_tcp_conn_bind, | |
2562 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 2563 | .set_param = iscsi_conn_set_param, |
7b8631b5 | 2564 | .get_conn_param = iscsi_conn_get_param, |
fd7255f5 | 2565 | .get_conn_str_param = iscsi_conn_get_str_param, |
7b8631b5 | 2566 | .get_session_param = iscsi_session_get_param, |
7ba24713 AA |
2567 | .start_conn = iscsi_conn_start, |
2568 | .stop_conn = iscsi_conn_stop, | |
5bb0b55a MC |
2569 | /* these are called as part of conn recovery */ |
2570 | .suspend_conn_recv = iscsi_tcp_suspend_conn_rx, | |
2571 | .terminate_conn = iscsi_tcp_terminate_conn, | |
2572 | /* IO */ | |
7ba24713 AA |
2573 | .send_pdu = iscsi_conn_send_pdu, |
2574 | .get_stats = iscsi_conn_get_stats, | |
5bb0b55a MC |
2575 | .init_cmd_task = iscsi_tcp_cmd_init, |
2576 | .init_mgmt_task = iscsi_tcp_mgmt_init, | |
2577 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, | |
2578 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2579 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2580 | /* recovery */ | |
30a6c652 | 2581 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
2582 | }; |
2583 | ||
2584 | static int __init | |
2585 | iscsi_tcp_init(void) | |
2586 | { | |
7ba24713 | 2587 | if (iscsi_max_lun < 1) { |
be2df72e OG |
2588 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
2589 | iscsi_max_lun); | |
7ba24713 AA |
2590 | return -EINVAL; |
2591 | } | |
2592 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
2593 | ||
2594 | taskcache = kmem_cache_create("iscsi_taskcache", | |
2595 | sizeof(struct iscsi_data_task), 0, | |
ac2b898c | 2596 | SLAB_HWCACHE_ALIGN, NULL, NULL); |
7ba24713 AA |
2597 | if (!taskcache) |
2598 | return -ENOMEM; | |
2599 | ||
7b8631b5 | 2600 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
7ba24713 AA |
2601 | kmem_cache_destroy(taskcache); |
2602 | ||
7b8631b5 | 2603 | return 0; |
7ba24713 AA |
2604 | } |
2605 | ||
2606 | static void __exit | |
2607 | iscsi_tcp_exit(void) | |
2608 | { | |
2609 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
2610 | kmem_cache_destroy(taskcache); | |
2611 | } | |
2612 | ||
2613 | module_init(iscsi_tcp_init); | |
2614 | module_exit(iscsi_tcp_exit); |