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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"); | |
7ba24713 | 50 | /* #define DEBUG_TCP */ |
7ba24713 AA |
51 | #define DEBUG_ASSERT |
52 | ||
53 | #ifdef DEBUG_TCP | |
5bb0b55a | 54 | #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) |
7ba24713 AA |
55 | #else |
56 | #define debug_tcp(fmt...) | |
57 | #endif | |
58 | ||
7ba24713 AA |
59 | #ifndef DEBUG_ASSERT |
60 | #ifdef BUG_ON | |
61 | #undef BUG_ON | |
62 | #endif | |
63 | #define BUG_ON(expr) | |
64 | #endif | |
65 | ||
7ba24713 AA |
66 | static unsigned int iscsi_max_lun = 512; |
67 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
68 | ||
7ba24713 AA |
69 | static inline void |
70 | iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size) | |
71 | { | |
7cae5159 MC |
72 | ibuf->sg.page = virt_to_page(vbuf); |
73 | ibuf->sg.offset = offset_in_page(vbuf); | |
7ba24713 AA |
74 | ibuf->sg.length = size; |
75 | ibuf->sent = 0; | |
7cae5159 | 76 | ibuf->use_sendmsg = 1; |
7ba24713 AA |
77 | } |
78 | ||
79 | static inline void | |
80 | iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg) | |
81 | { | |
7cae5159 MC |
82 | ibuf->sg.page = sg->page; |
83 | ibuf->sg.offset = sg->offset; | |
84 | ibuf->sg.length = sg->length; | |
7ba24713 AA |
85 | /* |
86 | * Fastpath: sg element fits into single page | |
87 | */ | |
a1e80c20 | 88 | if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page)) |
7cae5159 MC |
89 | ibuf->use_sendmsg = 0; |
90 | else | |
91 | ibuf->use_sendmsg = 1; | |
7ba24713 AA |
92 | ibuf->sent = 0; |
93 | } | |
94 | ||
95 | static inline int | |
96 | iscsi_buf_left(struct iscsi_buf *ibuf) | |
97 | { | |
98 | int rc; | |
99 | ||
100 | rc = ibuf->sg.length - ibuf->sent; | |
101 | BUG_ON(rc < 0); | |
102 | return rc; | |
103 | } | |
104 | ||
105 | static inline void | |
af973481 MC |
106 | iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, |
107 | u8* crc) | |
7ba24713 | 108 | { |
5bb0b55a | 109 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 110 | |
5bb0b55a MC |
111 | crypto_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc); |
112 | buf->sg.length += sizeof(uint32_t); | |
7ba24713 AA |
113 | } |
114 | ||
115 | static inline int | |
5bb0b55a | 116 | iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 117 | { |
5bb0b55a | 118 | struct sk_buff *skb = tcp_conn->in.skb; |
7ba24713 | 119 | |
5bb0b55a | 120 | tcp_conn->in.zero_copy_hdr = 0; |
7ba24713 | 121 | |
5bb0b55a MC |
122 | if (tcp_conn->in.copy >= tcp_conn->hdr_size && |
123 | tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) { | |
7ba24713 AA |
124 | /* |
125 | * Zero-copy PDU Header: using connection context | |
126 | * to store header pointer. | |
127 | */ | |
128 | if (skb_shinfo(skb)->frag_list == NULL && | |
5bb0b55a MC |
129 | !skb_shinfo(skb)->nr_frags) { |
130 | tcp_conn->in.hdr = (struct iscsi_hdr *) | |
131 | ((char*)skb->data + tcp_conn->in.offset); | |
132 | tcp_conn->in.zero_copy_hdr = 1; | |
133 | } else { | |
7ba24713 AA |
134 | /* ignoring return code since we checked |
135 | * in.copy before */ | |
5bb0b55a MC |
136 | skb_copy_bits(skb, tcp_conn->in.offset, |
137 | &tcp_conn->hdr, tcp_conn->hdr_size); | |
138 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
7ba24713 | 139 | } |
5bb0b55a MC |
140 | tcp_conn->in.offset += tcp_conn->hdr_size; |
141 | tcp_conn->in.copy -= tcp_conn->hdr_size; | |
7ba24713 AA |
142 | } else { |
143 | int hdr_remains; | |
144 | int copylen; | |
145 | ||
146 | /* | |
147 | * PDU header scattered across SKB's, | |
148 | * copying it... This'll happen quite rarely. | |
149 | */ | |
150 | ||
5bb0b55a MC |
151 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) |
152 | tcp_conn->in.hdr_offset = 0; | |
7ba24713 | 153 | |
5bb0b55a | 154 | hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset; |
7ba24713 AA |
155 | BUG_ON(hdr_remains <= 0); |
156 | ||
5bb0b55a MC |
157 | copylen = min(tcp_conn->in.copy, hdr_remains); |
158 | skb_copy_bits(skb, tcp_conn->in.offset, | |
159 | (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset, | |
160 | copylen); | |
7ba24713 AA |
161 | |
162 | debug_tcp("PDU gather offset %d bytes %d in.offset %d " | |
5bb0b55a MC |
163 | "in.copy %d\n", tcp_conn->in.hdr_offset, copylen, |
164 | tcp_conn->in.offset, tcp_conn->in.copy); | |
7ba24713 | 165 | |
5bb0b55a MC |
166 | tcp_conn->in.offset += copylen; |
167 | tcp_conn->in.copy -= copylen; | |
7ba24713 | 168 | if (copylen < hdr_remains) { |
5bb0b55a MC |
169 | tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER; |
170 | tcp_conn->in.hdr_offset += copylen; | |
7ba24713 AA |
171 | return -EAGAIN; |
172 | } | |
5bb0b55a MC |
173 | tcp_conn->in.hdr = &tcp_conn->hdr; |
174 | tcp_conn->discontiguous_hdr_cnt++; | |
175 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
176 | } |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
30a6c652 MC |
181 | /* |
182 | * must be called with session lock | |
183 | */ | |
184 | static void | |
b6c395ed | 185 | iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 186 | { |
5bb0b55a | 187 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
b6c395ed | 188 | struct iscsi_r2t_info *r2t; |
30a6c652 | 189 | struct scsi_cmnd *sc; |
7ba24713 | 190 | |
b6c395ed MC |
191 | /* flush ctask's r2t queues */ |
192 | while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { | |
193 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
194 | sizeof(void*)); | |
195 | debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n"); | |
196 | } | |
197 | ||
30a6c652 MC |
198 | sc = ctask->sc; |
199 | if (unlikely(!sc)) | |
7ba24713 | 200 | return; |
30a6c652 | 201 | |
5bb0b55a MC |
202 | tcp_ctask->xmstate = XMSTATE_IDLE; |
203 | tcp_ctask->r2t = NULL; | |
7ba24713 AA |
204 | } |
205 | ||
206 | /** | |
207 | * iscsi_data_rsp - SCSI Data-In Response processing | |
208 | * @conn: iscsi connection | |
209 | * @ctask: scsi command task | |
210 | **/ | |
211 | static int | |
212 | iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
213 | { | |
214 | int rc; | |
5bb0b55a MC |
215 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
216 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
217 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
7ba24713 AA |
218 | struct iscsi_session *session = conn->session; |
219 | int datasn = be32_to_cpu(rhdr->datasn); | |
220 | ||
221 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
222 | if (rc) | |
223 | return rc; | |
224 | /* | |
225 | * setup Data-In byte counter (gets decremented..) | |
226 | */ | |
5bb0b55a | 227 | ctask->data_count = tcp_conn->in.datalen; |
7ba24713 | 228 | |
5bb0b55a | 229 | if (tcp_conn->in.datalen == 0) |
7ba24713 AA |
230 | return 0; |
231 | ||
232 | if (ctask->datasn != datasn) | |
233 | return ISCSI_ERR_DATASN; | |
234 | ||
235 | ctask->datasn++; | |
236 | ||
5bb0b55a MC |
237 | tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); |
238 | if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length) | |
7ba24713 AA |
239 | return ISCSI_ERR_DATA_OFFSET; |
240 | ||
241 | if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
242 | struct scsi_cmnd *sc = ctask->sc; | |
243 | ||
244 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
bf310b8f | 245 | if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) { |
7ba24713 AA |
246 | int res_count = be32_to_cpu(rhdr->residual_count); |
247 | ||
248 | if (res_count > 0 && | |
249 | res_count <= sc->request_bufflen) { | |
250 | sc->resid = res_count; | |
251 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
252 | } else | |
253 | sc->result = (DID_BAD_TARGET << 16) | | |
254 | rhdr->cmd_status; | |
bf310b8f | 255 | } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) { |
7ba24713 AA |
256 | sc->resid = be32_to_cpu(rhdr->residual_count); |
257 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
258 | } else | |
259 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
260 | } | |
261 | ||
262 | conn->datain_pdus_cnt++; | |
263 | return 0; | |
264 | } | |
265 | ||
266 | /** | |
267 | * iscsi_solicit_data_init - initialize first Data-Out | |
268 | * @conn: iscsi connection | |
269 | * @ctask: scsi command task | |
270 | * @r2t: R2T info | |
271 | * | |
272 | * Notes: | |
273 | * Initialize first Data-Out within this R2T sequence and finds | |
274 | * proper data_offset within this SCSI command. | |
275 | * | |
276 | * This function is called with connection lock taken. | |
277 | **/ | |
278 | static void | |
279 | iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
280 | struct iscsi_r2t_info *r2t) | |
281 | { | |
282 | struct iscsi_data *hdr; | |
7ba24713 | 283 | struct scsi_cmnd *sc = ctask->sc; |
5bb0b55a | 284 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 285 | |
ffbfe925 | 286 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
287 | memset(hdr, 0, sizeof(struct iscsi_data)); |
288 | hdr->ttt = r2t->ttt; | |
289 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
290 | r2t->solicit_datasn++; | |
291 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
292 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
293 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
294 | hdr->exp_statsn = r2t->exp_statsn; |
295 | hdr->offset = cpu_to_be32(r2t->data_offset); | |
296 | if (r2t->data_length > conn->max_xmit_dlength) { | |
297 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
298 | r2t->data_count = conn->max_xmit_dlength; | |
299 | hdr->flags = 0; | |
300 | } else { | |
301 | hton24(hdr->dlength, r2t->data_length); | |
302 | r2t->data_count = r2t->data_length; | |
303 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
304 | } | |
305 | conn->dataout_pdus_cnt++; | |
306 | ||
307 | r2t->sent = 0; | |
308 | ||
6e458cc9 | 309 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 310 | sizeof(struct iscsi_hdr)); |
7ba24713 | 311 | |
7ba24713 AA |
312 | if (sc->use_sg) { |
313 | int i, sg_count = 0; | |
314 | struct scatterlist *sg = sc->request_buffer; | |
315 | ||
316 | r2t->sg = NULL; | |
317 | for (i = 0; i < sc->use_sg; i++, sg += 1) { | |
318 | /* FIXME: prefetch ? */ | |
319 | if (sg_count + sg->length > r2t->data_offset) { | |
320 | int page_offset; | |
321 | ||
322 | /* sg page found! */ | |
323 | ||
324 | /* offset within this page */ | |
325 | page_offset = r2t->data_offset - sg_count; | |
326 | ||
327 | /* fill in this buffer */ | |
328 | iscsi_buf_init_sg(&r2t->sendbuf, sg); | |
329 | r2t->sendbuf.sg.offset += page_offset; | |
330 | r2t->sendbuf.sg.length -= page_offset; | |
331 | ||
332 | /* xmit logic will continue with next one */ | |
333 | r2t->sg = sg + 1; | |
334 | break; | |
335 | } | |
336 | sg_count += sg->length; | |
337 | } | |
338 | BUG_ON(r2t->sg == NULL); | |
339 | } else | |
5bb0b55a | 340 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
7ba24713 AA |
341 | (char*)sc->request_buffer + r2t->data_offset, |
342 | r2t->data_count); | |
7ba24713 AA |
343 | } |
344 | ||
345 | /** | |
346 | * iscsi_r2t_rsp - iSCSI R2T Response processing | |
347 | * @conn: iscsi connection | |
348 | * @ctask: scsi command task | |
349 | **/ | |
350 | static int | |
351 | iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
352 | { | |
353 | struct iscsi_r2t_info *r2t; | |
354 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
355 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
356 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
357 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
7ba24713 AA |
358 | int r2tsn = be32_to_cpu(rhdr->r2tsn); |
359 | int rc; | |
360 | ||
5bb0b55a | 361 | if (tcp_conn->in.datalen) |
7ba24713 AA |
362 | return ISCSI_ERR_DATALEN; |
363 | ||
5bb0b55a | 364 | if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn) |
7ba24713 AA |
365 | return ISCSI_ERR_R2TSN; |
366 | ||
367 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
368 | if (rc) | |
369 | return rc; | |
370 | ||
371 | /* FIXME: use R2TSN to detect missing R2T */ | |
372 | ||
373 | /* fill-in new R2T associated with the task */ | |
374 | spin_lock(&session->lock); | |
375 | if (!ctask->sc || ctask->mtask || | |
376 | session->state != ISCSI_STATE_LOGGED_IN) { | |
377 | printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " | |
378 | "recovery...\n", ctask->itt); | |
379 | spin_unlock(&session->lock); | |
380 | return 0; | |
381 | } | |
b6c395ed | 382 | |
5bb0b55a | 383 | rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 AA |
384 | BUG_ON(!rc); |
385 | ||
386 | r2t->exp_statsn = rhdr->statsn; | |
387 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
388 | if (r2t->data_length == 0 || | |
389 | r2t->data_length > session->max_burst) { | |
390 | spin_unlock(&session->lock); | |
391 | return ISCSI_ERR_DATALEN; | |
392 | } | |
393 | ||
394 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); | |
395 | if (r2t->data_offset + r2t->data_length > ctask->total_length) { | |
396 | spin_unlock(&session->lock); | |
397 | return ISCSI_ERR_DATALEN; | |
398 | } | |
399 | ||
400 | r2t->ttt = rhdr->ttt; /* no flip */ | |
401 | r2t->solicit_datasn = 0; | |
402 | ||
403 | iscsi_solicit_data_init(conn, ctask, r2t); | |
404 | ||
5bb0b55a MC |
405 | tcp_ctask->exp_r2tsn = r2tsn + 1; |
406 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
407 | __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); | |
b6c395ed | 408 | list_move_tail(&ctask->running, &conn->xmitqueue); |
7ba24713 | 409 | |
55e3299d | 410 | scsi_queue_work(session->host, &conn->xmitwork); |
7ba24713 AA |
411 | conn->r2t_pdus_cnt++; |
412 | spin_unlock(&session->lock); | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | static int | |
5bb0b55a | 418 | iscsi_tcp_hdr_recv(struct iscsi_conn *conn) |
7ba24713 | 419 | { |
5bb0b55a | 420 | int rc = 0, opcode, ahslen; |
7ba24713 | 421 | struct iscsi_hdr *hdr; |
7ba24713 | 422 | struct iscsi_session *session = conn->session; |
5bb0b55a MC |
423 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
424 | uint32_t cdgst, rdgst = 0, itt; | |
7ba24713 | 425 | |
5bb0b55a | 426 | hdr = tcp_conn->in.hdr; |
7ba24713 AA |
427 | |
428 | /* verify PDU length */ | |
5bb0b55a MC |
429 | tcp_conn->in.datalen = ntoh24(hdr->dlength); |
430 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
7ba24713 | 431 | printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", |
5bb0b55a | 432 | tcp_conn->in.datalen, conn->max_recv_dlength); |
7ba24713 AA |
433 | return ISCSI_ERR_DATALEN; |
434 | } | |
5bb0b55a | 435 | tcp_conn->data_copied = 0; |
7ba24713 AA |
436 | |
437 | /* read AHS */ | |
5bb0b55a MC |
438 | ahslen = hdr->hlength << 2; |
439 | tcp_conn->in.offset += ahslen; | |
440 | tcp_conn->in.copy -= ahslen; | |
441 | if (tcp_conn->in.copy < 0) { | |
7ba24713 | 442 | printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " |
5bb0b55a | 443 | "%d bytes\n", ahslen); |
7ba24713 AA |
444 | return ISCSI_ERR_AHSLEN; |
445 | } | |
446 | ||
447 | /* calculate read padding */ | |
5bb0b55a MC |
448 | tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1); |
449 | if (tcp_conn->in.padding) { | |
450 | tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding; | |
451 | debug_scsi("read padding %d bytes\n", tcp_conn->in.padding); | |
7ba24713 AA |
452 | } |
453 | ||
454 | if (conn->hdrdgst_en) { | |
455 | struct scatterlist sg; | |
456 | ||
457 | sg_init_one(&sg, (u8 *)hdr, | |
5bb0b55a MC |
458 | sizeof(struct iscsi_hdr) + ahslen); |
459 | crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst); | |
7ba24713 | 460 | rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + |
5bb0b55a | 461 | ahslen); |
8a47cd34 | 462 | if (cdgst != rdgst) { |
5bb0b55a MC |
463 | printk(KERN_ERR "iscsi_tcp: hdrdgst error " |
464 | "recv 0x%x calc 0x%x\n", rdgst, cdgst); | |
8a47cd34 MC |
465 | return ISCSI_ERR_HDR_DGST; |
466 | } | |
7ba24713 AA |
467 | } |
468 | ||
5bb0b55a | 469 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
7ba24713 | 470 | /* verify itt (itt encoding: age+cid+itt) */ |
5bb0b55a MC |
471 | rc = iscsi_verify_itt(conn, hdr, &itt); |
472 | if (rc == ISCSI_ERR_NO_SCSI_CMD) { | |
473 | tcp_conn->in.datalen = 0; /* force drop */ | |
474 | return 0; | |
475 | } else if (rc) | |
476 | return rc; | |
7ba24713 AA |
477 | |
478 | debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", | |
5bb0b55a MC |
479 | opcode, tcp_conn->in.offset, tcp_conn->in.copy, |
480 | ahslen, tcp_conn->in.datalen); | |
7ba24713 | 481 | |
5bb0b55a MC |
482 | switch(opcode) { |
483 | case ISCSI_OP_SCSI_DATA_IN: | |
484 | tcp_conn->in.ctask = session->cmds[itt]; | |
485 | rc = iscsi_data_rsp(conn, tcp_conn->in.ctask); | |
275fd7d1 MC |
486 | if (rc) |
487 | return rc; | |
5bb0b55a MC |
488 | /* fall through */ |
489 | case ISCSI_OP_SCSI_CMD_RSP: | |
490 | tcp_conn->in.ctask = session->cmds[itt]; | |
491 | if (tcp_conn->in.datalen) | |
492 | goto copy_hdr; | |
7ba24713 | 493 | |
5bb0b55a | 494 | spin_lock(&session->lock); |
b6c395ed | 495 | iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask); |
5bb0b55a MC |
496 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); |
497 | spin_unlock(&session->lock); | |
498 | break; | |
499 | case ISCSI_OP_R2T: | |
500 | tcp_conn->in.ctask = session->cmds[itt]; | |
501 | if (ahslen) | |
502 | rc = ISCSI_ERR_AHSLEN; | |
503 | else if (tcp_conn->in.ctask->sc->sc_data_direction == | |
504 | DMA_TO_DEVICE) | |
505 | rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); | |
506 | else | |
507 | rc = ISCSI_ERR_PROTO; | |
508 | break; | |
509 | case ISCSI_OP_LOGIN_RSP: | |
510 | case ISCSI_OP_TEXT_RSP: | |
5bb0b55a MC |
511 | case ISCSI_OP_REJECT: |
512 | case ISCSI_OP_ASYNC_EVENT: | |
c8dc1e52 MC |
513 | /* |
514 | * It is possible that we could get a PDU with a buffer larger | |
515 | * than 8K, but there are no targets that currently do this. | |
516 | * For now we fail until we find a vendor that needs it | |
517 | */ | |
518 | if (DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH < | |
519 | tcp_conn->in.datalen) { | |
520 | printk(KERN_ERR "iscsi_tcp: received buffer of len %u " | |
521 | "but conn buffer is only %u (opcode %0x)\n", | |
522 | tcp_conn->in.datalen, | |
523 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, opcode); | |
524 | rc = ISCSI_ERR_PROTO; | |
525 | break; | |
526 | } | |
527 | ||
5bb0b55a MC |
528 | if (tcp_conn->in.datalen) |
529 | goto copy_hdr; | |
530 | /* fall through */ | |
c8dc1e52 MC |
531 | case ISCSI_OP_LOGOUT_RSP: |
532 | case ISCSI_OP_NOOP_IN: | |
5bb0b55a MC |
533 | case ISCSI_OP_SCSI_TMFUNC_RSP: |
534 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
535 | break; | |
536 | default: | |
537 | rc = ISCSI_ERR_BAD_OPCODE; | |
538 | break; | |
539 | } | |
7ba24713 AA |
540 | |
541 | return rc; | |
5bb0b55a MC |
542 | |
543 | copy_hdr: | |
544 | /* | |
545 | * if we did zero copy for the header but we will need multiple | |
546 | * skbs to complete the command then we have to copy the header | |
547 | * for later use | |
548 | */ | |
275fd7d1 | 549 | if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <= |
5bb0b55a MC |
550 | (tcp_conn->in.datalen + tcp_conn->in.padding + |
551 | (conn->datadgst_en ? 4 : 0))) { | |
552 | debug_tcp("Copying header for later use. in.copy %d in.datalen" | |
553 | " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); | |
554 | memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, | |
555 | sizeof(struct iscsi_hdr)); | |
556 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
557 | tcp_conn->in.zero_copy_hdr = 0; | |
558 | } | |
559 | return 0; | |
7ba24713 AA |
560 | } |
561 | ||
562 | /** | |
563 | * iscsi_ctask_copy - copy skb bits to the destanation cmd task | |
5bb0b55a | 564 | * @conn: iscsi tcp connection |
7ba24713 AA |
565 | * @ctask: scsi command task |
566 | * @buf: buffer to copy to | |
567 | * @buf_size: size of buffer | |
568 | * @offset: offset within the buffer | |
569 | * | |
570 | * Notes: | |
571 | * The function calls skb_copy_bits() and updates per-connection and | |
572 | * per-cmd byte counters. | |
573 | * | |
574 | * Read counters (in bytes): | |
575 | * | |
576 | * conn->in.offset offset within in progress SKB | |
577 | * conn->in.copy left to copy from in progress SKB | |
578 | * including padding | |
579 | * conn->in.copied copied already from in progress SKB | |
580 | * conn->data_copied copied already from in progress buffer | |
581 | * ctask->sent total bytes sent up to the MidLayer | |
582 | * ctask->data_count left to copy from in progress Data-In | |
583 | * buf_left left to copy from in progress buffer | |
584 | **/ | |
585 | static inline int | |
5bb0b55a | 586 | iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, |
7ba24713 AA |
587 | void *buf, int buf_size, int offset) |
588 | { | |
5bb0b55a MC |
589 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
590 | int buf_left = buf_size - (tcp_conn->data_copied + offset); | |
591 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
592 | int rc; |
593 | ||
594 | size = min(size, ctask->data_count); | |
595 | ||
596 | debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 597 | size, tcp_conn->in.offset, tcp_conn->in.copied); |
7ba24713 AA |
598 | |
599 | BUG_ON(size <= 0); | |
5bb0b55a | 600 | BUG_ON(tcp_ctask->sent + size > ctask->total_length); |
7ba24713 | 601 | |
5bb0b55a MC |
602 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
603 | (char*)buf + (offset + tcp_conn->data_copied), size); | |
7ba24713 AA |
604 | /* must fit into skb->len */ |
605 | BUG_ON(rc); | |
606 | ||
5bb0b55a MC |
607 | tcp_conn->in.offset += size; |
608 | tcp_conn->in.copy -= size; | |
609 | tcp_conn->in.copied += size; | |
610 | tcp_conn->data_copied += size; | |
611 | tcp_ctask->sent += size; | |
7ba24713 AA |
612 | ctask->data_count -= size; |
613 | ||
5bb0b55a | 614 | BUG_ON(tcp_conn->in.copy < 0); |
7ba24713 AA |
615 | BUG_ON(ctask->data_count < 0); |
616 | ||
5bb0b55a | 617 | if (buf_size != (tcp_conn->data_copied + offset)) { |
7ba24713 | 618 | if (!ctask->data_count) { |
5bb0b55a | 619 | BUG_ON(buf_size - tcp_conn->data_copied < 0); |
7ba24713 | 620 | /* done with this PDU */ |
5bb0b55a | 621 | return buf_size - tcp_conn->data_copied; |
7ba24713 AA |
622 | } |
623 | return -EAGAIN; | |
624 | } | |
625 | ||
626 | /* done with this buffer or with both - PDU and buffer */ | |
5bb0b55a | 627 | tcp_conn->data_copied = 0; |
7ba24713 AA |
628 | return 0; |
629 | } | |
630 | ||
631 | /** | |
632 | * iscsi_tcp_copy - copy skb bits to the destanation buffer | |
5bb0b55a | 633 | * @conn: iscsi tcp connection |
7ba24713 AA |
634 | * |
635 | * Notes: | |
636 | * The function calls skb_copy_bits() and updates per-connection | |
637 | * byte counters. | |
638 | **/ | |
639 | static inline int | |
c8dc1e52 | 640 | iscsi_tcp_copy(struct iscsi_conn *conn) |
7ba24713 | 641 | { |
c8dc1e52 | 642 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5bb0b55a MC |
643 | int buf_size = tcp_conn->in.datalen; |
644 | int buf_left = buf_size - tcp_conn->data_copied; | |
645 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
646 | int rc; |
647 | ||
648 | debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 649 | size, tcp_conn->in.offset, tcp_conn->data_copied); |
7ba24713 AA |
650 | BUG_ON(size <= 0); |
651 | ||
5bb0b55a | 652 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
c8dc1e52 | 653 | (char*)conn->data + tcp_conn->data_copied, size); |
7ba24713 AA |
654 | BUG_ON(rc); |
655 | ||
5bb0b55a MC |
656 | tcp_conn->in.offset += size; |
657 | tcp_conn->in.copy -= size; | |
658 | tcp_conn->in.copied += size; | |
659 | tcp_conn->data_copied += size; | |
7ba24713 | 660 | |
5bb0b55a | 661 | if (buf_size != tcp_conn->data_copied) |
7ba24713 AA |
662 | return -EAGAIN; |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
667 | static inline void | |
5bb0b55a MC |
668 | partial_sg_digest_update(struct iscsi_tcp_conn *tcp_conn, |
669 | struct scatterlist *sg, int offset, int length) | |
7ba24713 AA |
670 | { |
671 | struct scatterlist temp; | |
672 | ||
673 | memcpy(&temp, sg, sizeof(struct scatterlist)); | |
674 | temp.offset = offset; | |
675 | temp.length = length; | |
5bb0b55a | 676 | crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1); |
7ba24713 AA |
677 | } |
678 | ||
f6cfba1d | 679 | static void |
5bb0b55a | 680 | iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) |
f6cfba1d MC |
681 | { |
682 | struct scatterlist tmp; | |
683 | ||
684 | sg_init_one(&tmp, buf, len); | |
5bb0b55a | 685 | crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1); |
f6cfba1d MC |
686 | } |
687 | ||
7ba24713 AA |
688 | static int iscsi_scsi_data_in(struct iscsi_conn *conn) |
689 | { | |
5bb0b55a MC |
690 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
691 | struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; | |
692 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 693 | struct scsi_cmnd *sc = ctask->sc; |
f6cfba1d | 694 | struct scatterlist *sg; |
7ba24713 AA |
695 | int i, offset, rc = 0; |
696 | ||
697 | BUG_ON((void*)ctask != sc->SCp.ptr); | |
698 | ||
699 | /* | |
700 | * copying Data-In into the Scsi_Cmnd | |
701 | */ | |
702 | if (!sc->use_sg) { | |
703 | i = ctask->data_count; | |
5bb0b55a MC |
704 | rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, |
705 | sc->request_bufflen, | |
706 | tcp_ctask->data_offset); | |
7ba24713 AA |
707 | if (rc == -EAGAIN) |
708 | return rc; | |
42f72aa9 | 709 | if (conn->datadgst_en) |
5bb0b55a MC |
710 | iscsi_recv_digest_update(tcp_conn, sc->request_buffer, |
711 | i); | |
7ba24713 AA |
712 | rc = 0; |
713 | goto done; | |
714 | } | |
715 | ||
5bb0b55a | 716 | offset = tcp_ctask->data_offset; |
7ba24713 AA |
717 | sg = sc->request_buffer; |
718 | ||
5bb0b55a MC |
719 | if (tcp_ctask->data_offset) |
720 | for (i = 0; i < tcp_ctask->sg_count; i++) | |
7ba24713 AA |
721 | offset -= sg[i].length; |
722 | /* we've passed through partial sg*/ | |
723 | if (offset < 0) | |
724 | offset = 0; | |
725 | ||
5bb0b55a | 726 | for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { |
7ba24713 AA |
727 | char *dest; |
728 | ||
729 | dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); | |
5bb0b55a | 730 | rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, |
7ba24713 AA |
731 | sg[i].length, offset); |
732 | kunmap_atomic(dest, KM_SOFTIRQ0); | |
733 | if (rc == -EAGAIN) | |
734 | /* continue with the next SKB/PDU */ | |
735 | return rc; | |
736 | if (!rc) { | |
737 | if (conn->datadgst_en) { | |
738 | if (!offset) | |
5bb0b55a MC |
739 | crypto_digest_update( |
740 | tcp_conn->data_rx_tfm, | |
741 | &sg[i], 1); | |
7ba24713 | 742 | else |
5bb0b55a MC |
743 | partial_sg_digest_update(tcp_conn, |
744 | &sg[i], | |
7ba24713 AA |
745 | sg[i].offset + offset, |
746 | sg[i].length - offset); | |
747 | } | |
748 | offset = 0; | |
5bb0b55a | 749 | tcp_ctask->sg_count++; |
7ba24713 AA |
750 | } |
751 | ||
752 | if (!ctask->data_count) { | |
753 | if (rc && conn->datadgst_en) | |
754 | /* | |
755 | * data-in is complete, but buffer not... | |
756 | */ | |
5bb0b55a | 757 | partial_sg_digest_update(tcp_conn, &sg[i], |
7ba24713 AA |
758 | sg[i].offset, sg[i].length-rc); |
759 | rc = 0; | |
760 | break; | |
761 | } | |
762 | ||
5bb0b55a | 763 | if (!tcp_conn->in.copy) |
7ba24713 AA |
764 | return -EAGAIN; |
765 | } | |
766 | BUG_ON(ctask->data_count); | |
767 | ||
768 | done: | |
769 | /* check for non-exceptional status */ | |
5bb0b55a | 770 | if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { |
b6c395ed MC |
771 | debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n", |
772 | (long)sc, sc->result, ctask->itt, | |
773 | tcp_conn->in.hdr->flags); | |
5bb0b55a | 774 | spin_lock(&conn->session->lock); |
b6c395ed | 775 | iscsi_tcp_cleanup_ctask(conn, ctask); |
5bb0b55a MC |
776 | __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); |
777 | spin_unlock(&conn->session->lock); | |
7ba24713 AA |
778 | } |
779 | ||
780 | return rc; | |
781 | } | |
782 | ||
783 | static int | |
784 | iscsi_data_recv(struct iscsi_conn *conn) | |
785 | { | |
5bb0b55a MC |
786 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
787 | int rc = 0, opcode; | |
7ba24713 | 788 | |
5bb0b55a MC |
789 | opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
790 | switch (opcode) { | |
7ba24713 AA |
791 | case ISCSI_OP_SCSI_DATA_IN: |
792 | rc = iscsi_scsi_data_in(conn); | |
793 | break; | |
5bb0b55a MC |
794 | case ISCSI_OP_SCSI_CMD_RSP: |
795 | spin_lock(&conn->session->lock); | |
b6c395ed | 796 | iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask); |
5bb0b55a | 797 | spin_unlock(&conn->session->lock); |
7ba24713 AA |
798 | case ISCSI_OP_TEXT_RSP: |
799 | case ISCSI_OP_LOGIN_RSP: | |
5bb0b55a MC |
800 | case ISCSI_OP_ASYNC_EVENT: |
801 | case ISCSI_OP_REJECT: | |
7ba24713 AA |
802 | /* |
803 | * Collect data segment to the connection's data | |
804 | * placeholder | |
805 | */ | |
c8dc1e52 | 806 | if (iscsi_tcp_copy(conn)) { |
7ba24713 AA |
807 | rc = -EAGAIN; |
808 | goto exit; | |
809 | } | |
810 | ||
c8dc1e52 | 811 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data, |
5bb0b55a MC |
812 | tcp_conn->in.datalen); |
813 | if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) | |
c8dc1e52 | 814 | iscsi_recv_digest_update(tcp_conn, conn->data, |
5bb0b55a MC |
815 | tcp_conn->in.datalen); |
816 | break; | |
7ba24713 AA |
817 | default: |
818 | BUG_ON(1); | |
819 | } | |
820 | exit: | |
821 | return rc; | |
822 | } | |
823 | ||
824 | /** | |
825 | * iscsi_tcp_data_recv - TCP receive in sendfile fashion | |
826 | * @rd_desc: read descriptor | |
827 | * @skb: socket buffer | |
828 | * @offset: offset in skb | |
829 | * @len: skb->len - offset | |
830 | **/ | |
831 | static int | |
832 | iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
833 | unsigned int offset, size_t len) | |
834 | { | |
835 | int rc; | |
836 | struct iscsi_conn *conn = rd_desc->arg.data; | |
5bb0b55a | 837 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
838 | int processed; |
839 | char pad[ISCSI_PAD_LEN]; | |
840 | struct scatterlist sg; | |
841 | ||
842 | /* | |
843 | * Save current SKB and its offset in the corresponding | |
844 | * connection context. | |
845 | */ | |
5bb0b55a MC |
846 | tcp_conn->in.copy = skb->len - offset; |
847 | tcp_conn->in.offset = offset; | |
848 | tcp_conn->in.skb = skb; | |
849 | tcp_conn->in.len = tcp_conn->in.copy; | |
850 | BUG_ON(tcp_conn->in.copy <= 0); | |
851 | debug_tcp("in %d bytes\n", tcp_conn->in.copy); | |
7ba24713 AA |
852 | |
853 | more: | |
5bb0b55a | 854 | tcp_conn->in.copied = 0; |
7ba24713 AA |
855 | rc = 0; |
856 | ||
857 | if (unlikely(conn->suspend_rx)) { | |
858 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
859 | return 0; | |
860 | } | |
861 | ||
5bb0b55a MC |
862 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || |
863 | tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { | |
864 | rc = iscsi_hdr_extract(tcp_conn); | |
7ba24713 AA |
865 | if (rc) { |
866 | if (rc == -EAGAIN) | |
867 | goto nomore; | |
868 | else { | |
d82967c7 | 869 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
870 | return 0; |
871 | } | |
872 | } | |
873 | ||
874 | /* | |
875 | * Verify and process incoming PDU header. | |
876 | */ | |
5bb0b55a MC |
877 | rc = iscsi_tcp_hdr_recv(conn); |
878 | if (!rc && tcp_conn->in.datalen) { | |
8a47cd34 | 879 | if (conn->datadgst_en) { |
5bb0b55a MC |
880 | BUG_ON(!tcp_conn->data_rx_tfm); |
881 | crypto_digest_init(tcp_conn->data_rx_tfm); | |
7ba24713 | 882 | } |
5bb0b55a | 883 | tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; |
7ba24713 | 884 | } else if (rc) { |
40527afe | 885 | iscsi_conn_failure(conn, rc); |
7ba24713 AA |
886 | return 0; |
887 | } | |
888 | } | |
889 | ||
5bb0b55a | 890 | if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { |
f6cfba1d | 891 | uint32_t recv_digest; |
5bb0b55a | 892 | |
7ba24713 | 893 | debug_tcp("extra data_recv offset %d copy %d\n", |
5bb0b55a MC |
894 | tcp_conn->in.offset, tcp_conn->in.copy); |
895 | skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, | |
f6cfba1d | 896 | &recv_digest, 4); |
5bb0b55a MC |
897 | tcp_conn->in.offset += 4; |
898 | tcp_conn->in.copy -= 4; | |
899 | if (recv_digest != tcp_conn->in.datadgst) { | |
f6cfba1d MC |
900 | debug_tcp("iscsi_tcp: data digest error!" |
901 | "0x%x != 0x%x\n", recv_digest, | |
5bb0b55a | 902 | tcp_conn->in.datadgst); |
f6cfba1d MC |
903 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
904 | return 0; | |
905 | } else { | |
906 | debug_tcp("iscsi_tcp: data digest match!" | |
907 | "0x%x == 0x%x\n", recv_digest, | |
5bb0b55a MC |
908 | tcp_conn->in.datadgst); |
909 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
910 | } |
911 | } | |
912 | ||
5bb0b55a MC |
913 | if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && |
914 | tcp_conn->in.copy) { | |
7ba24713 AA |
915 | |
916 | debug_tcp("data_recv offset %d copy %d\n", | |
5bb0b55a | 917 | tcp_conn->in.offset, tcp_conn->in.copy); |
7ba24713 AA |
918 | |
919 | rc = iscsi_data_recv(conn); | |
920 | if (rc) { | |
665b44ae | 921 | if (rc == -EAGAIN) |
7ba24713 | 922 | goto again; |
d82967c7 | 923 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7ba24713 AA |
924 | return 0; |
925 | } | |
5bb0b55a MC |
926 | tcp_conn->in.copy -= tcp_conn->in.padding; |
927 | tcp_conn->in.offset += tcp_conn->in.padding; | |
8a47cd34 | 928 | if (conn->datadgst_en) { |
5bb0b55a MC |
929 | if (tcp_conn->in.padding) { |
930 | debug_tcp("padding -> %d\n", | |
931 | tcp_conn->in.padding); | |
932 | memset(pad, 0, tcp_conn->in.padding); | |
933 | sg_init_one(&sg, pad, tcp_conn->in.padding); | |
934 | crypto_digest_update(tcp_conn->data_rx_tfm, | |
935 | &sg, 1); | |
7ba24713 | 936 | } |
5bb0b55a MC |
937 | crypto_digest_final(tcp_conn->data_rx_tfm, |
938 | (u8 *) & tcp_conn->in.datadgst); | |
939 | debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); | |
940 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; | |
7ba24713 | 941 | } else |
5bb0b55a | 942 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
7ba24713 AA |
943 | } |
944 | ||
945 | debug_tcp("f, processed %d from out of %d padding %d\n", | |
5bb0b55a MC |
946 | tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); |
947 | BUG_ON(tcp_conn->in.offset - offset > len); | |
7ba24713 | 948 | |
5bb0b55a | 949 | if (tcp_conn->in.offset - offset != len) { |
7ba24713 | 950 | debug_tcp("continue to process %d bytes\n", |
5bb0b55a | 951 | (int)len - (tcp_conn->in.offset - offset)); |
7ba24713 AA |
952 | goto more; |
953 | } | |
954 | ||
955 | nomore: | |
5bb0b55a | 956 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
957 | BUG_ON(processed == 0); |
958 | return processed; | |
959 | ||
960 | again: | |
5bb0b55a | 961 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
962 | debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", |
963 | processed, (int)len, (int)rd_desc->count); | |
964 | BUG_ON(processed == 0); | |
965 | BUG_ON(processed > len); | |
966 | ||
967 | conn->rxdata_octets += processed; | |
968 | return processed; | |
969 | } | |
970 | ||
971 | static void | |
972 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
973 | { | |
974 | struct iscsi_conn *conn = sk->sk_user_data; | |
975 | read_descriptor_t rd_desc; | |
976 | ||
977 | read_lock(&sk->sk_callback_lock); | |
978 | ||
665b44ae MC |
979 | /* |
980 | * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv. | |
981 | * We set count to 1 because we want the network layer to | |
982 | * hand us all the skbs that are available. iscsi_tcp_data_recv | |
983 | * handled pdus that cross buffers or pdus that still need data. | |
984 | */ | |
7ba24713 | 985 | rd_desc.arg.data = conn; |
665b44ae | 986 | rd_desc.count = 1; |
7ba24713 AA |
987 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); |
988 | ||
989 | read_unlock(&sk->sk_callback_lock); | |
990 | } | |
991 | ||
992 | static void | |
993 | iscsi_tcp_state_change(struct sock *sk) | |
994 | { | |
5bb0b55a | 995 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
996 | struct iscsi_conn *conn; |
997 | struct iscsi_session *session; | |
998 | void (*old_state_change)(struct sock *); | |
999 | ||
1000 | read_lock(&sk->sk_callback_lock); | |
1001 | ||
1002 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
1003 | session = conn->session; | |
1004 | ||
e6273993 MC |
1005 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
1006 | sk->sk_state == TCP_CLOSE) && | |
1007 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
1008 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
1009 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1010 | } | |
1011 | ||
5bb0b55a MC |
1012 | tcp_conn = conn->dd_data; |
1013 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
1014 | |
1015 | read_unlock(&sk->sk_callback_lock); | |
1016 | ||
1017 | old_state_change(sk); | |
1018 | } | |
1019 | ||
1020 | /** | |
1021 | * iscsi_write_space - Called when more output buffer space is available | |
1022 | * @sk: socket space is available for | |
1023 | **/ | |
1024 | static void | |
1025 | iscsi_write_space(struct sock *sk) | |
1026 | { | |
1027 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1028 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1029 | ||
1030 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1031 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
55e3299d | 1032 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1033 | } |
1034 | ||
1035 | static void | |
1036 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1037 | { | |
5bb0b55a MC |
1038 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1039 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1040 | |
1041 | /* assign new callbacks */ | |
1042 | write_lock_bh(&sk->sk_callback_lock); | |
1043 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1044 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1045 | tcp_conn->old_state_change = sk->sk_state_change; | |
1046 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1047 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1048 | sk->sk_state_change = iscsi_tcp_state_change; | |
1049 | sk->sk_write_space = iscsi_write_space; | |
1050 | write_unlock_bh(&sk->sk_callback_lock); | |
1051 | } | |
1052 | ||
1053 | static void | |
1c83469d | 1054 | iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 1055 | { |
5bb0b55a | 1056 | struct sock *sk = tcp_conn->sock->sk; |
7ba24713 AA |
1057 | |
1058 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1059 | write_lock_bh(&sk->sk_callback_lock); | |
1060 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1061 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1062 | sk->sk_state_change = tcp_conn->old_state_change; | |
1063 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1064 | sk->sk_no_check = 0; |
1065 | write_unlock_bh(&sk->sk_callback_lock); | |
1066 | } | |
1067 | ||
1068 | /** | |
1069 | * iscsi_send - generic send routine | |
1070 | * @sk: kernel's socket | |
1071 | * @buf: buffer to write from | |
1072 | * @size: actual size to write | |
1073 | * @flags: socket's flags | |
7ba24713 AA |
1074 | */ |
1075 | static inline int | |
56851698 | 1076 | iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
7ba24713 | 1077 | { |
5bb0b55a MC |
1078 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1079 | struct socket *sk = tcp_conn->sock; | |
3219e529 | 1080 | int offset = buf->sg.offset + buf->sent, res; |
7ba24713 | 1081 | |
7cae5159 MC |
1082 | /* |
1083 | * if we got use_sg=0 or are sending something we kmallocd | |
1084 | * then we did not have to do kmap (kmap returns page_address) | |
1085 | * | |
1086 | * if we got use_sg > 0, but had to drop down, we do not | |
1087 | * set clustering so this should only happen for that | |
1088 | * slab case. | |
1089 | */ | |
1090 | if (buf->use_sendmsg) | |
3219e529 | 1091 | res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags); |
7cae5159 | 1092 | else |
3219e529 MC |
1093 | res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags); |
1094 | ||
1095 | if (res >= 0) { | |
1096 | conn->txdata_octets += res; | |
1097 | buf->sent += res; | |
1098 | return res; | |
1099 | } | |
1100 | ||
1101 | tcp_conn->sendpage_failures_cnt++; | |
1102 | if (res == -EAGAIN) | |
1103 | res = -ENOBUFS; | |
1104 | else | |
1105 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1106 | return res; | |
7ba24713 AA |
1107 | } |
1108 | ||
1109 | /** | |
1110 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() | |
1111 | * @conn: iscsi connection | |
1112 | * @buf: buffer to write from | |
1113 | * @datalen: lenght of data to be sent after the header | |
1114 | * | |
1115 | * Notes: | |
1116 | * (Tx, Fast Path) | |
1117 | **/ | |
1118 | static inline int | |
1119 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) | |
1120 | { | |
7ba24713 AA |
1121 | int flags = 0; /* MSG_DONTWAIT; */ |
1122 | int res, size; | |
1123 | ||
1124 | size = buf->sg.length - buf->sent; | |
1125 | BUG_ON(buf->sent + size > buf->sg.length); | |
1126 | if (buf->sent + size != buf->sg.length || datalen) | |
1127 | flags |= MSG_MORE; | |
1128 | ||
56851698 | 1129 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1130 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
1131 | if (res >= 0) { | |
7ba24713 AA |
1132 | if (size != res) |
1133 | return -EAGAIN; | |
1134 | return 0; | |
3219e529 | 1135 | } |
7ba24713 AA |
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 | { | |
7ba24713 AA |
1154 | int flags = 0; /* MSG_DONTWAIT; */ |
1155 | int res, size; | |
1156 | ||
1157 | size = buf->sg.length - buf->sent; | |
1158 | BUG_ON(buf->sent + size > buf->sg.length); | |
1159 | if (size > *count) | |
1160 | size = *count; | |
b13941f6 | 1161 | if (buf->sent + size != buf->sg.length || *count != size) |
7ba24713 AA |
1162 | flags |= MSG_MORE; |
1163 | ||
56851698 | 1164 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1165 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
1166 | size, buf->sent, *count, *sent, res); | |
1167 | if (res >= 0) { | |
7ba24713 AA |
1168 | *count -= res; |
1169 | *sent += res; | |
1170 | if (size != res) | |
1171 | return -EAGAIN; | |
1172 | return 0; | |
3219e529 | 1173 | } |
7ba24713 AA |
1174 | |
1175 | return res; | |
1176 | } | |
1177 | ||
1178 | static inline void | |
5bb0b55a MC |
1179 | iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
1180 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1181 | { |
5bb0b55a MC |
1182 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1183 | ||
1184 | BUG_ON(!tcp_conn->data_tx_tfm); | |
1185 | crypto_digest_init(tcp_conn->data_tx_tfm); | |
1186 | tcp_ctask->digest_count = 4; | |
7ba24713 AA |
1187 | } |
1188 | ||
858119e1 | 1189 | static int |
7ba24713 AA |
1190 | iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
1191 | struct iscsi_buf *buf, uint32_t *digest, int final) | |
1192 | { | |
5bb0b55a MC |
1193 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1194 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 AA |
1195 | int rc = 0; |
1196 | int sent = 0; | |
1197 | ||
1198 | if (final) | |
5bb0b55a | 1199 | crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest); |
7ba24713 | 1200 | |
6e458cc9 | 1201 | iscsi_buf_init_iov(buf, (char*)digest, 4); |
5bb0b55a | 1202 | rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
7ba24713 | 1203 | if (rc) { |
5bb0b55a MC |
1204 | tcp_ctask->datadigest = *digest; |
1205 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; | |
7ba24713 | 1206 | } else |
5bb0b55a | 1207 | tcp_ctask->digest_count = 4; |
7ba24713 AA |
1208 | return rc; |
1209 | } | |
1210 | ||
1211 | /** | |
1212 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1213 | * @conn: iscsi connection | |
1214 | * @ctask: scsi command task | |
1215 | * @r2t: R2T info | |
1216 | * @left: bytes left to transfer | |
1217 | * | |
1218 | * Notes: | |
1219 | * Initialize next Data-Out within this R2T sequence and continue | |
1220 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1221 | * | |
1222 | * Called under connection lock. | |
1223 | **/ | |
1224 | static void | |
1225 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1226 | struct iscsi_r2t_info *r2t, int left) | |
1227 | { | |
5bb0b55a | 1228 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1229 | struct iscsi_data *hdr; |
7ba24713 AA |
1230 | struct scsi_cmnd *sc = ctask->sc; |
1231 | int new_offset; | |
1232 | ||
ffbfe925 | 1233 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
1234 | memset(hdr, 0, sizeof(struct iscsi_data)); |
1235 | hdr->ttt = r2t->ttt; | |
1236 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1237 | r2t->solicit_datasn++; | |
1238 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
1239 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
1240 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
1241 | hdr->exp_statsn = r2t->exp_statsn; |
1242 | new_offset = r2t->data_offset + r2t->sent; | |
1243 | hdr->offset = cpu_to_be32(new_offset); | |
1244 | if (left > conn->max_xmit_dlength) { | |
1245 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1246 | r2t->data_count = conn->max_xmit_dlength; | |
1247 | } else { | |
1248 | hton24(hdr->dlength, left); | |
1249 | r2t->data_count = left; | |
1250 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1251 | } | |
1252 | conn->dataout_pdus_cnt++; | |
1253 | ||
6e458cc9 | 1254 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 1255 | sizeof(struct iscsi_hdr)); |
7ba24713 | 1256 | |
7ba24713 | 1257 | if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { |
5bb0b55a | 1258 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
7ba24713 AA |
1259 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1260 | r2t->sg += 1; | |
1261 | } else | |
5bb0b55a | 1262 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
7ba24713 AA |
1263 | (char*)sc->request_buffer + new_offset, |
1264 | r2t->data_count); | |
7ba24713 AA |
1265 | } |
1266 | ||
1267 | static void | |
1268 | iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1269 | { | |
5bb0b55a | 1270 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1271 | struct iscsi_data_task *dtask; |
1272 | ||
ffbfe925 | 1273 | dtask = tcp_ctask->dtask = &tcp_ctask->unsol_dtask; |
5bb0b55a MC |
1274 | iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr, |
1275 | tcp_ctask->r2t_data_count); | |
6e458cc9 | 1276 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, |
af973481 | 1277 | sizeof(struct iscsi_hdr)); |
7ba24713 AA |
1278 | } |
1279 | ||
1280 | /** | |
5bb0b55a | 1281 | * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 AA |
1282 | * @conn: iscsi connection |
1283 | * @ctask: scsi command task | |
1284 | * @sc: scsi command | |
1285 | **/ | |
1286 | static void | |
5bb0b55a | 1287 | iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
7ba24713 | 1288 | { |
5bb0b55a MC |
1289 | struct scsi_cmnd *sc = ctask->sc; |
1290 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 1291 | |
5bb0b55a | 1292 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
7ba24713 | 1293 | |
5bb0b55a MC |
1294 | tcp_ctask->sent = 0; |
1295 | tcp_ctask->sg_count = 0; | |
7ba24713 AA |
1296 | |
1297 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
5bb0b55a MC |
1298 | tcp_ctask->xmstate = XMSTATE_W_HDR; |
1299 | tcp_ctask->exp_r2tsn = 0; | |
7ba24713 | 1300 | BUG_ON(ctask->total_length == 0); |
5bb0b55a | 1301 | |
7ba24713 AA |
1302 | if (sc->use_sg) { |
1303 | struct scatterlist *sg = sc->request_buffer; | |
1304 | ||
5bb0b55a MC |
1305 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1306 | &sg[tcp_ctask->sg_count++]); | |
1307 | tcp_ctask->sg = sg; | |
1308 | tcp_ctask->bad_sg = sg + sc->use_sg; | |
1309 | } else | |
1310 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, | |
1311 | sc->request_buffer, | |
1312 | sc->request_bufflen); | |
7ba24713 | 1313 | |
5bb0b55a MC |
1314 | if (ctask->imm_count) |
1315 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; | |
1316 | ||
1317 | tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); | |
1318 | if (tcp_ctask->pad_count) { | |
1319 | tcp_ctask->pad_count = ISCSI_PAD_LEN - | |
1320 | tcp_ctask->pad_count; | |
7ba24713 | 1321 | debug_scsi("write padding %d bytes\n", |
5bb0b55a MC |
1322 | tcp_ctask->pad_count); |
1323 | tcp_ctask->xmstate |= XMSTATE_W_PAD; | |
7ba24713 | 1324 | } |
7ba24713 | 1325 | |
5bb0b55a MC |
1326 | if (ctask->unsol_count) |
1327 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR | | |
1328 | XMSTATE_UNS_INIT; | |
1329 | tcp_ctask->r2t_data_count = ctask->total_length - | |
7ba24713 AA |
1330 | ctask->imm_count - |
1331 | ctask->unsol_count; | |
1332 | ||
b6c395ed | 1333 | debug_scsi("cmd [itt 0x%x total %d imm %d imm_data %d " |
7ba24713 AA |
1334 | "r2t_data %d]\n", |
1335 | ctask->itt, ctask->total_length, ctask->imm_count, | |
5bb0b55a MC |
1336 | ctask->unsol_count, tcp_ctask->r2t_data_count); |
1337 | } else | |
1338 | tcp_ctask->xmstate = XMSTATE_R_HDR; | |
7ba24713 | 1339 | |
6e458cc9 | 1340 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, |
af973481 | 1341 | sizeof(struct iscsi_hdr)); |
7ba24713 AA |
1342 | } |
1343 | ||
1344 | /** | |
5bb0b55a | 1345 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
7ba24713 AA |
1346 | * @conn: iscsi connection |
1347 | * @mtask: task management task | |
1348 | * | |
1349 | * Notes: | |
1350 | * The function can return -EAGAIN in which case caller must | |
1351 | * call it again later, or recover. '0' return code means successful | |
1352 | * xmit. | |
1353 | * | |
1354 | * Management xmit state machine consists of two states: | |
1355 | * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress | |
1356 | * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress | |
1357 | **/ | |
1358 | static int | |
5bb0b55a | 1359 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1360 | { |
5bb0b55a | 1361 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
3219e529 | 1362 | int rc; |
7ba24713 AA |
1363 | |
1364 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", | |
5bb0b55a | 1365 | conn->id, tcp_mtask->xmstate, mtask->itt); |
7ba24713 | 1366 | |
5bb0b55a MC |
1367 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { |
1368 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; | |
7ba24713 | 1369 | if (mtask->data_count) |
5bb0b55a | 1370 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
af973481 | 1371 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
30a6c652 | 1372 | conn->stop_stage != STOP_CONN_RECOVER && |
af973481 | 1373 | conn->hdrdgst_en) |
5bb0b55a MC |
1374 | iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
1375 | (u8*)tcp_mtask->hdrext); | |
3219e529 MC |
1376 | rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf, |
1377 | mtask->data_count); | |
1378 | if (rc) { | |
5bb0b55a | 1379 | tcp_mtask->xmstate |= XMSTATE_IMM_HDR; |
7ba24713 | 1380 | if (mtask->data_count) |
5bb0b55a | 1381 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
3219e529 | 1382 | return rc; |
7ba24713 AA |
1383 | } |
1384 | } | |
1385 | ||
5bb0b55a | 1386 | if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 | 1387 | BUG_ON(!mtask->data_count); |
5bb0b55a | 1388 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1389 | /* FIXME: implement. |
1390 | * Virtual buffer could be spreaded across multiple pages... | |
1391 | */ | |
1392 | do { | |
3219e529 MC |
1393 | int rc; |
1394 | ||
1395 | rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf, | |
1396 | &mtask->data_count, &tcp_mtask->sent); | |
1397 | if (rc) { | |
5bb0b55a | 1398 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
3219e529 | 1399 | return rc; |
7ba24713 AA |
1400 | } |
1401 | } while (mtask->data_count); | |
1402 | } | |
1403 | ||
5bb0b55a MC |
1404 | BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
1405 | if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
1406 | struct iscsi_session *session = conn->session; | |
1407 | ||
1408 | spin_lock_bh(&session->lock); | |
1409 | list_del(&conn->mtask->running); | |
1410 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, | |
1411 | sizeof(void*)); | |
1412 | spin_unlock_bh(&session->lock); | |
1413 | } | |
7ba24713 AA |
1414 | return 0; |
1415 | } | |
1416 | ||
1417 | static inline int | |
5bb0b55a MC |
1418 | handle_xmstate_r_hdr(struct iscsi_conn *conn, |
1419 | struct iscsi_tcp_cmd_task *tcp_ctask) | |
7ba24713 | 1420 | { |
3219e529 MC |
1421 | int rc; |
1422 | ||
5bb0b55a | 1423 | tcp_ctask->xmstate &= ~XMSTATE_R_HDR; |
42f72aa9 | 1424 | if (conn->hdrdgst_en) |
5bb0b55a MC |
1425 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
1426 | (u8*)tcp_ctask->hdrext); | |
3219e529 MC |
1427 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0); |
1428 | if (!rc) { | |
5bb0b55a | 1429 | BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE); |
7ba24713 AA |
1430 | return 0; /* wait for Data-In */ |
1431 | } | |
5bb0b55a | 1432 | tcp_ctask->xmstate |= XMSTATE_R_HDR; |
3219e529 | 1433 | return rc; |
7ba24713 AA |
1434 | } |
1435 | ||
1436 | static inline int | |
5bb0b55a MC |
1437 | handle_xmstate_w_hdr(struct iscsi_conn *conn, |
1438 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1439 | { |
5bb0b55a | 1440 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1441 | int rc; |
5bb0b55a MC |
1442 | |
1443 | tcp_ctask->xmstate &= ~XMSTATE_W_HDR; | |
42f72aa9 | 1444 | if (conn->hdrdgst_en) |
5bb0b55a MC |
1445 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
1446 | (u8*)tcp_ctask->hdrext); | |
3219e529 MC |
1447 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count); |
1448 | if (rc) | |
5bb0b55a | 1449 | tcp_ctask->xmstate |= XMSTATE_W_HDR; |
3219e529 | 1450 | return rc; |
7ba24713 AA |
1451 | } |
1452 | ||
1453 | static inline int | |
1454 | handle_xmstate_data_digest(struct iscsi_conn *conn, | |
1455 | struct iscsi_cmd_task *ctask) | |
1456 | { | |
5bb0b55a | 1457 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1458 | int rc; |
5bb0b55a MC |
1459 | |
1460 | tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST; | |
1461 | debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest); | |
3219e529 MC |
1462 | rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, |
1463 | &tcp_ctask->datadigest, 0); | |
1464 | if (rc) { | |
5bb0b55a | 1465 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; |
7ba24713 | 1466 | debug_tcp("resent data digest 0x%x fail!\n", |
5bb0b55a | 1467 | tcp_ctask->datadigest); |
7ba24713 | 1468 | } |
3219e529 MC |
1469 | |
1470 | return rc; | |
7ba24713 AA |
1471 | } |
1472 | ||
1473 | static inline int | |
1474 | handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1475 | { | |
5bb0b55a MC |
1476 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1477 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
3219e529 | 1478 | int rc; |
5bb0b55a | 1479 | |
7ba24713 | 1480 | BUG_ON(!ctask->imm_count); |
5bb0b55a | 1481 | tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1482 | |
1483 | if (conn->datadgst_en) { | |
5bb0b55a MC |
1484 | iscsi_data_digest_init(tcp_conn, ctask); |
1485 | tcp_ctask->immdigest = 0; | |
7ba24713 AA |
1486 | } |
1487 | ||
1488 | for (;;) { | |
3219e529 MC |
1489 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
1490 | &ctask->imm_count, &tcp_ctask->sent); | |
1491 | if (rc) { | |
5bb0b55a | 1492 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; |
7ba24713 | 1493 | if (conn->datadgst_en) { |
5bb0b55a MC |
1494 | crypto_digest_final(tcp_conn->data_tx_tfm, |
1495 | (u8*)&tcp_ctask->immdigest); | |
7ba24713 | 1496 | debug_tcp("tx imm sendpage fail 0x%x\n", |
5bb0b55a | 1497 | tcp_ctask->datadigest); |
7ba24713 | 1498 | } |
3219e529 | 1499 | return rc; |
7ba24713 AA |
1500 | } |
1501 | if (conn->datadgst_en) | |
5bb0b55a MC |
1502 | crypto_digest_update(tcp_conn->data_tx_tfm, |
1503 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1504 | |
1505 | if (!ctask->imm_count) | |
1506 | break; | |
5bb0b55a MC |
1507 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1508 | &tcp_ctask->sg[tcp_ctask->sg_count++]); | |
7ba24713 AA |
1509 | } |
1510 | ||
5bb0b55a | 1511 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
3219e529 MC |
1512 | rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, |
1513 | &tcp_ctask->immdigest, 1); | |
1514 | if (rc) { | |
7ba24713 | 1515 | debug_tcp("sending imm digest 0x%x fail!\n", |
5bb0b55a | 1516 | tcp_ctask->immdigest); |
3219e529 | 1517 | return rc; |
7ba24713 | 1518 | } |
5bb0b55a | 1519 | debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest); |
7ba24713 AA |
1520 | } |
1521 | ||
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | static inline int | |
1526 | handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1527 | { | |
5bb0b55a | 1528 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1529 | struct iscsi_data_task *dtask; |
3219e529 | 1530 | int rc; |
7ba24713 | 1531 | |
5bb0b55a MC |
1532 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
1533 | if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { | |
7ba24713 | 1534 | iscsi_unsolicit_data_init(conn, ctask); |
5bb0b55a | 1535 | dtask = tcp_ctask->dtask; |
af973481 | 1536 | if (conn->hdrdgst_en) |
5bb0b55a | 1537 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
af973481 | 1538 | (u8*)dtask->hdrext); |
5bb0b55a | 1539 | tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
7ba24713 | 1540 | } |
3219e529 MC |
1541 | |
1542 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count); | |
1543 | if (rc) { | |
5bb0b55a MC |
1544 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
1545 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR; | |
3219e529 | 1546 | return rc; |
7ba24713 AA |
1547 | } |
1548 | ||
1549 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", | |
5bb0b55a | 1550 | ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
7ba24713 AA |
1551 | return 0; |
1552 | } | |
1553 | ||
1554 | static inline int | |
1555 | handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1556 | { | |
5bb0b55a MC |
1557 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1558 | struct iscsi_data_task *dtask = tcp_ctask->dtask; | |
1559 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
3219e529 | 1560 | int rc; |
7ba24713 AA |
1561 | |
1562 | BUG_ON(!ctask->data_count); | |
5bb0b55a | 1563 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
7ba24713 AA |
1564 | |
1565 | if (conn->datadgst_en) { | |
5bb0b55a | 1566 | iscsi_data_digest_init(tcp_conn, ctask); |
7ba24713 AA |
1567 | dtask->digest = 0; |
1568 | } | |
1569 | ||
1570 | for (;;) { | |
5bb0b55a | 1571 | int start = tcp_ctask->sent; |
7ba24713 | 1572 | |
3219e529 MC |
1573 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
1574 | &ctask->data_count, &tcp_ctask->sent); | |
1575 | if (rc) { | |
5bb0b55a MC |
1576 | ctask->unsol_count -= tcp_ctask->sent - start; |
1577 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; | |
7ba24713 AA |
1578 | /* will continue with this ctask later.. */ |
1579 | if (conn->datadgst_en) { | |
5bb0b55a | 1580 | crypto_digest_final(tcp_conn->data_tx_tfm, |
7ba24713 AA |
1581 | (u8 *)&dtask->digest); |
1582 | debug_tcp("tx uns data fail 0x%x\n", | |
1583 | dtask->digest); | |
1584 | } | |
3219e529 | 1585 | return rc; |
7ba24713 AA |
1586 | } |
1587 | ||
5bb0b55a MC |
1588 | BUG_ON(tcp_ctask->sent > ctask->total_length); |
1589 | ctask->unsol_count -= tcp_ctask->sent - start; | |
7ba24713 AA |
1590 | |
1591 | /* | |
1592 | * XXX:we may run here with un-initial sendbuf. | |
1593 | * so pass it | |
1594 | */ | |
5bb0b55a MC |
1595 | if (conn->datadgst_en && tcp_ctask->sent - start > 0) |
1596 | crypto_digest_update(tcp_conn->data_tx_tfm, | |
1597 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1598 | |
1599 | if (!ctask->data_count) | |
1600 | break; | |
5bb0b55a MC |
1601 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1602 | &tcp_ctask->sg[tcp_ctask->sg_count++]); | |
7ba24713 AA |
1603 | } |
1604 | BUG_ON(ctask->unsol_count < 0); | |
1605 | ||
1606 | /* | |
1607 | * Done with the Data-Out. Next, check if we need | |
1608 | * to send another unsolicited Data-Out. | |
1609 | */ | |
1610 | if (ctask->unsol_count) { | |
1611 | if (conn->datadgst_en) { | |
3219e529 | 1612 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1613 | &dtask->digestbuf, |
3219e529 MC |
1614 | &dtask->digest, 1); |
1615 | if (rc) { | |
7ba24713 AA |
1616 | debug_tcp("send uns digest 0x%x fail\n", |
1617 | dtask->digest); | |
3219e529 | 1618 | return rc; |
7ba24713 AA |
1619 | } |
1620 | debug_tcp("sending uns digest 0x%x, more uns\n", | |
1621 | dtask->digest); | |
1622 | } | |
5bb0b55a | 1623 | tcp_ctask->xmstate |= XMSTATE_UNS_INIT; |
7ba24713 AA |
1624 | return 1; |
1625 | } | |
1626 | ||
5bb0b55a | 1627 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
3219e529 | 1628 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1629 | &dtask->digestbuf, |
3219e529 MC |
1630 | &dtask->digest, 1); |
1631 | if (rc) { | |
7ba24713 AA |
1632 | debug_tcp("send last uns digest 0x%x fail\n", |
1633 | dtask->digest); | |
3219e529 | 1634 | return rc; |
7ba24713 AA |
1635 | } |
1636 | debug_tcp("sending uns digest 0x%x\n",dtask->digest); | |
1637 | } | |
1638 | ||
1639 | return 0; | |
1640 | } | |
1641 | ||
1642 | static inline int | |
1643 | handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1644 | { | |
1645 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
1646 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1647 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1648 | struct iscsi_r2t_info *r2t = tcp_ctask->r2t; | |
ffbfe925 | 1649 | struct iscsi_data_task *dtask = &r2t->dtask; |
3219e529 | 1650 | int left, rc; |
7ba24713 | 1651 | |
5bb0b55a MC |
1652 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
1653 | tcp_ctask->dtask = dtask; | |
7ba24713 AA |
1654 | |
1655 | if (conn->datadgst_en) { | |
5bb0b55a | 1656 | iscsi_data_digest_init(tcp_conn, ctask); |
7ba24713 AA |
1657 | dtask->digest = 0; |
1658 | } | |
1659 | solicit_again: | |
1660 | /* | |
b6c395ed | 1661 | * send Data-Out within this R2T sequence. |
7ba24713 AA |
1662 | */ |
1663 | if (!r2t->data_count) | |
1664 | goto data_out_done; | |
1665 | ||
3219e529 MC |
1666 | rc = iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent); |
1667 | if (rc) { | |
5bb0b55a | 1668 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
7ba24713 AA |
1669 | /* will continue with this ctask later.. */ |
1670 | if (conn->datadgst_en) { | |
5bb0b55a | 1671 | crypto_digest_final(tcp_conn->data_tx_tfm, |
7ba24713 AA |
1672 | (u8 *)&dtask->digest); |
1673 | debug_tcp("r2t data send fail 0x%x\n", dtask->digest); | |
1674 | } | |
3219e529 | 1675 | return rc; |
7ba24713 AA |
1676 | } |
1677 | ||
1678 | BUG_ON(r2t->data_count < 0); | |
1679 | if (conn->datadgst_en) | |
5bb0b55a MC |
1680 | crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg, |
1681 | 1); | |
7ba24713 AA |
1682 | |
1683 | if (r2t->data_count) { | |
1684 | BUG_ON(ctask->sc->use_sg == 0); | |
1685 | if (!iscsi_buf_left(&r2t->sendbuf)) { | |
5bb0b55a | 1686 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
7ba24713 AA |
1687 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1688 | r2t->sg += 1; | |
1689 | } | |
1690 | goto solicit_again; | |
1691 | } | |
1692 | ||
1693 | data_out_done: | |
1694 | /* | |
1695 | * Done with this Data-Out. Next, check if we have | |
1696 | * to send another Data-Out for this R2T. | |
1697 | */ | |
1698 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1699 | left = r2t->data_length - r2t->sent; | |
1700 | if (left) { | |
1701 | if (conn->datadgst_en) { | |
3219e529 | 1702 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1703 | &dtask->digestbuf, |
3219e529 MC |
1704 | &dtask->digest, 1); |
1705 | if (rc) { | |
7ba24713 AA |
1706 | debug_tcp("send r2t data digest 0x%x" |
1707 | "fail\n", dtask->digest); | |
3219e529 | 1708 | return rc; |
7ba24713 AA |
1709 | } |
1710 | debug_tcp("r2t data send digest 0x%x\n", | |
1711 | dtask->digest); | |
1712 | } | |
1713 | iscsi_solicit_data_cont(conn, ctask, r2t, left); | |
5bb0b55a MC |
1714 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
1715 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
7ba24713 AA |
1716 | return 1; |
1717 | } | |
1718 | ||
1719 | /* | |
1720 | * Done with this R2T. Check if there are more | |
1721 | * outstanding R2Ts ready to be processed. | |
1722 | */ | |
5bb0b55a | 1723 | BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0); |
7ba24713 | 1724 | if (conn->datadgst_en) { |
3219e529 MC |
1725 | rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, |
1726 | &dtask->digest, 1); | |
1727 | if (rc) { | |
7ba24713 AA |
1728 | debug_tcp("send last r2t data digest 0x%x" |
1729 | "fail\n", dtask->digest); | |
3219e529 | 1730 | return rc; |
7ba24713 AA |
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; | |
b6c395ed | 1756 | int sent = 0, rc; |
7ba24713 | 1757 | |
5bb0b55a | 1758 | tcp_ctask->xmstate &= ~XMSTATE_W_PAD; |
6e458cc9 | 1759 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, |
5bb0b55a | 1760 | tcp_ctask->pad_count); |
3219e529 MC |
1761 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, |
1762 | &sent); | |
1763 | if (rc) { | |
5bb0b55a | 1764 | tcp_ctask->xmstate |= XMSTATE_W_PAD; |
3219e529 | 1765 | return rc; |
7ba24713 AA |
1766 | } |
1767 | ||
1768 | if (conn->datadgst_en) { | |
5bb0b55a MC |
1769 | crypto_digest_update(tcp_conn->data_tx_tfm, |
1770 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1771 | /* imm data? */ |
1772 | if (!dtask) { | |
3219e529 | 1773 | rc = iscsi_digest_final_send(conn, ctask, |
5bb0b55a | 1774 | &tcp_ctask->immbuf, |
3219e529 MC |
1775 | &tcp_ctask->immdigest, 1); |
1776 | if (rc) { | |
7ba24713 | 1777 | debug_tcp("send padding digest 0x%x" |
5bb0b55a | 1778 | "fail!\n", tcp_ctask->immdigest); |
3219e529 | 1779 | return rc; |
7ba24713 AA |
1780 | } |
1781 | debug_tcp("done with padding, digest 0x%x\n", | |
5bb0b55a | 1782 | tcp_ctask->datadigest); |
7ba24713 | 1783 | } else { |
3219e529 | 1784 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1785 | &dtask->digestbuf, |
3219e529 MC |
1786 | &dtask->digest, 1); |
1787 | if (rc) { | |
7ba24713 AA |
1788 | debug_tcp("send padding digest 0x%x" |
1789 | "fail\n", dtask->digest); | |
3219e529 | 1790 | return rc; |
7ba24713 AA |
1791 | } |
1792 | debug_tcp("done with padding, digest 0x%x\n", | |
1793 | dtask->digest); | |
1794 | } | |
1795 | } | |
1796 | ||
1797 | return 0; | |
1798 | } | |
1799 | ||
1800 | static int | |
5bb0b55a | 1801 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 1802 | { |
5bb0b55a | 1803 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1804 | int rc = 0; |
1805 | ||
1806 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", | |
5bb0b55a | 1807 | conn->id, tcp_ctask->xmstate, ctask->itt); |
7ba24713 AA |
1808 | |
1809 | /* | |
1810 | * serialize with TMF AbortTask | |
1811 | */ | |
1812 | if (ctask->mtask) | |
1813 | return rc; | |
1814 | ||
3219e529 MC |
1815 | if (tcp_ctask->xmstate & XMSTATE_R_HDR) |
1816 | return handle_xmstate_r_hdr(conn, tcp_ctask); | |
7ba24713 | 1817 | |
5bb0b55a | 1818 | if (tcp_ctask->xmstate & XMSTATE_W_HDR) { |
7ba24713 AA |
1819 | rc = handle_xmstate_w_hdr(conn, ctask); |
1820 | if (rc) | |
1821 | return rc; | |
1822 | } | |
1823 | ||
1824 | /* XXX: for data digest xmit recover */ | |
5bb0b55a | 1825 | if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) { |
7ba24713 AA |
1826 | rc = handle_xmstate_data_digest(conn, ctask); |
1827 | if (rc) | |
1828 | return rc; | |
1829 | } | |
1830 | ||
5bb0b55a | 1831 | if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 AA |
1832 | rc = handle_xmstate_imm_data(conn, ctask); |
1833 | if (rc) | |
1834 | return rc; | |
1835 | } | |
1836 | ||
5bb0b55a | 1837 | if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
7ba24713 | 1838 | BUG_ON(!ctask->unsol_count); |
5bb0b55a | 1839 | tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; |
7ba24713 AA |
1840 | unsolicit_head_again: |
1841 | rc = handle_xmstate_uns_hdr(conn, ctask); | |
1842 | if (rc) | |
1843 | return rc; | |
1844 | } | |
1845 | ||
5bb0b55a | 1846 | if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
7ba24713 AA |
1847 | rc = handle_xmstate_uns_data(conn, ctask); |
1848 | if (rc == 1) | |
1849 | goto unsolicit_head_again; | |
1850 | else if (rc) | |
1851 | return rc; | |
1852 | goto done; | |
1853 | } | |
1854 | ||
5bb0b55a | 1855 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { |
7ba24713 AA |
1856 | struct iscsi_r2t_info *r2t; |
1857 | ||
5bb0b55a MC |
1858 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
1859 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
1860 | if (!tcp_ctask->r2t) | |
1861 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, | |
7ba24713 AA |
1862 | sizeof(void*)); |
1863 | solicit_head_again: | |
5bb0b55a | 1864 | r2t = tcp_ctask->r2t; |
af973481 | 1865 | if (conn->hdrdgst_en) |
42f72aa9 | 1866 | iscsi_hdr_digest(conn, &r2t->headbuf, |
ffbfe925 | 1867 | (u8*)r2t->dtask.hdrext); |
3219e529 MC |
1868 | rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count); |
1869 | if (rc) { | |
5bb0b55a MC |
1870 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
1871 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
3219e529 | 1872 | return rc; |
7ba24713 AA |
1873 | } |
1874 | ||
1875 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", | |
1876 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, | |
1877 | r2t->sent); | |
1878 | } | |
1879 | ||
5bb0b55a | 1880 | if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
7ba24713 AA |
1881 | rc = handle_xmstate_sol_data(conn, ctask); |
1882 | if (rc == 1) | |
1883 | goto solicit_head_again; | |
1884 | if (rc) | |
1885 | return rc; | |
1886 | } | |
1887 | ||
1888 | done: | |
1889 | /* | |
1890 | * Last thing to check is whether we need to send write | |
1891 | * padding. Note that we check for xmstate equality, not just the bit. | |
1892 | */ | |
5bb0b55a | 1893 | if (tcp_ctask->xmstate == XMSTATE_W_PAD) |
7ba24713 AA |
1894 | rc = handle_xmstate_w_pad(conn, ctask); |
1895 | ||
1896 | return rc; | |
1897 | } | |
1898 | ||
5bb0b55a MC |
1899 | static struct iscsi_cls_conn * |
1900 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1901 | { |
5bb0b55a MC |
1902 | struct iscsi_conn *conn; |
1903 | struct iscsi_cls_conn *cls_conn; | |
1904 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1905 | |
5bb0b55a MC |
1906 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
1907 | if (!cls_conn) | |
1908 | return NULL; | |
1909 | conn = cls_conn->dd_data; | |
7ba24713 | 1910 | /* |
5bb0b55a MC |
1911 | * due to strange issues with iser these are not set |
1912 | * in iscsi_conn_setup | |
7ba24713 | 1913 | */ |
5bb0b55a | 1914 | conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; |
7ba24713 | 1915 | |
5bb0b55a MC |
1916 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
1917 | if (!tcp_conn) | |
1918 | goto tcp_conn_alloc_fail; | |
7ba24713 | 1919 | |
5bb0b55a MC |
1920 | conn->dd_data = tcp_conn; |
1921 | tcp_conn->iscsi_conn = conn; | |
1922 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
1923 | /* initial operational parameters */ | |
1924 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); | |
7ba24713 | 1925 | |
5bb0b55a | 1926 | return cls_conn; |
7ba24713 | 1927 | |
5bb0b55a MC |
1928 | tcp_conn_alloc_fail: |
1929 | iscsi_conn_teardown(cls_conn); | |
1930 | return NULL; | |
7ba24713 AA |
1931 | } |
1932 | ||
1c83469d MC |
1933 | static void |
1934 | iscsi_tcp_release_conn(struct iscsi_conn *conn) | |
1935 | { | |
1936 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1937 | ||
1938 | if (!tcp_conn->sock) | |
1939 | return; | |
1940 | ||
1941 | sock_hold(tcp_conn->sock->sk); | |
1942 | iscsi_conn_restore_callbacks(tcp_conn); | |
1943 | sock_put(tcp_conn->sock->sk); | |
1944 | ||
1945 | sock_release(tcp_conn->sock); | |
1946 | tcp_conn->sock = NULL; | |
1947 | conn->recv_lock = NULL; | |
1948 | } | |
1949 | ||
7ba24713 | 1950 | static void |
5bb0b55a | 1951 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1952 | { |
5bb0b55a MC |
1953 | struct iscsi_conn *conn = cls_conn->dd_data; |
1954 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1955 | int digest = 0; | |
7ba24713 | 1956 | |
5bb0b55a MC |
1957 | if (conn->hdrdgst_en || conn->datadgst_en) |
1958 | digest = 1; | |
7ba24713 | 1959 | |
1c83469d | 1960 | iscsi_tcp_release_conn(conn); |
5bb0b55a | 1961 | iscsi_conn_teardown(cls_conn); |
7ba24713 | 1962 | |
5bb0b55a MC |
1963 | /* now free tcp_conn */ |
1964 | if (digest) { | |
1965 | if (tcp_conn->tx_tfm) | |
1966 | crypto_free_tfm(tcp_conn->tx_tfm); | |
1967 | if (tcp_conn->rx_tfm) | |
1968 | crypto_free_tfm(tcp_conn->rx_tfm); | |
1969 | if (tcp_conn->data_tx_tfm) | |
1970 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
1971 | if (tcp_conn->data_rx_tfm) | |
1972 | crypto_free_tfm(tcp_conn->data_rx_tfm); | |
1973 | } | |
7ba24713 | 1974 | |
5bb0b55a MC |
1975 | kfree(tcp_conn); |
1976 | } | |
7ba24713 | 1977 | |
1c83469d MC |
1978 | static void |
1979 | iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1980 | { | |
1981 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1982 | ||
1983 | iscsi_conn_stop(cls_conn, flag); | |
1984 | iscsi_tcp_release_conn(conn); | |
1985 | } | |
1986 | ||
5bb0b55a MC |
1987 | static int |
1988 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1989 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1990 | int is_leading) |
1991 | { | |
1992 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1993 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1994 | struct sock *sk; | |
1995 | struct socket *sock; | |
1996 | int err; | |
7ba24713 | 1997 | |
5bb0b55a | 1998 | /* lookup for existing socket */ |
264faaaa | 1999 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a MC |
2000 | if (!sock) { |
2001 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); | |
2002 | return -EEXIST; | |
7ba24713 AA |
2003 | } |
2004 | ||
5bb0b55a MC |
2005 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
2006 | if (err) | |
2007 | return err; | |
7ba24713 | 2008 | |
67a61114 MC |
2009 | /* bind iSCSI connection and socket */ |
2010 | tcp_conn->sock = sock; | |
7ba24713 | 2011 | |
67a61114 MC |
2012 | /* setup Socket parameters */ |
2013 | sk = sock->sk; | |
2014 | sk->sk_reuse = 1; | |
2015 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
2016 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 2017 | |
67a61114 | 2018 | /* FIXME: disable Nagle's algorithm */ |
7ba24713 | 2019 | |
67a61114 MC |
2020 | /* |
2021 | * Intercept TCP callbacks for sendfile like receive | |
2022 | * processing. | |
2023 | */ | |
2024 | conn->recv_lock = &sk->sk_callback_lock; | |
2025 | iscsi_conn_set_callbacks(conn); | |
2026 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; | |
2027 | /* | |
2028 | * set receive state machine into initial state | |
2029 | */ | |
2030 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 | 2031 | |
7ba24713 AA |
2032 | return 0; |
2033 | } | |
2034 | ||
5bb0b55a | 2035 | /* called with host lock */ |
30a6c652 | 2036 | static void |
5bb0b55a MC |
2037 | iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask, |
2038 | char *data, uint32_t data_size) | |
7ba24713 | 2039 | { |
5bb0b55a | 2040 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
7ba24713 | 2041 | |
6e458cc9 MC |
2042 | iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr, |
2043 | sizeof(struct iscsi_hdr)); | |
5bb0b55a | 2044 | tcp_mtask->xmstate = XMSTATE_IMM_HDR; |
b6c395ed | 2045 | tcp_mtask->sent = 0; |
7ba24713 | 2046 | |
5bb0b55a MC |
2047 | if (mtask->data_count) |
2048 | iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data, | |
7ba24713 | 2049 | mtask->data_count); |
7ba24713 AA |
2050 | } |
2051 | ||
2052 | static int | |
2053 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
2054 | { | |
2055 | int i; | |
2056 | int cmd_i; | |
2057 | ||
2058 | /* | |
2059 | * initialize per-task: R2T pool and xmit queue | |
2060 | */ | |
2061 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2062 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
5bb0b55a | 2063 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
2064 | |
2065 | /* | |
2066 | * pre-allocated x4 as much r2ts to handle race when | |
2067 | * target acks DataOut faster than we data_xmit() queues | |
2068 | * could replenish r2tqueue. | |
2069 | */ | |
2070 | ||
2071 | /* R2T pool */ | |
5bb0b55a MC |
2072 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
2073 | (void***)&tcp_ctask->r2ts, | |
2074 | sizeof(struct iscsi_r2t_info))) { | |
7ba24713 AA |
2075 | goto r2t_alloc_fail; |
2076 | } | |
2077 | ||
2078 | /* R2T xmit queue */ | |
5bb0b55a | 2079 | tcp_ctask->r2tqueue = kfifo_alloc( |
7ba24713 | 2080 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
5bb0b55a MC |
2081 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
2082 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2083 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2084 | goto r2t_alloc_fail; |
2085 | } | |
7ba24713 AA |
2086 | } |
2087 | ||
2088 | return 0; | |
2089 | ||
2090 | r2t_alloc_fail: | |
2091 | for (i = 0; i < cmd_i; i++) { | |
5bb0b55a MC |
2092 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2093 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2094 | ||
5bb0b55a MC |
2095 | kfifo_free(tcp_ctask->r2tqueue); |
2096 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2097 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2098 | } |
2099 | return -ENOMEM; | |
2100 | } | |
2101 | ||
2102 | static void | |
2103 | iscsi_r2tpool_free(struct iscsi_session *session) | |
2104 | { | |
2105 | int i; | |
2106 | ||
2107 | for (i = 0; i < session->cmds_max; i++) { | |
5bb0b55a MC |
2108 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2109 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 2110 | |
5bb0b55a MC |
2111 | kfifo_free(tcp_ctask->r2tqueue); |
2112 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2113 | (void**)tcp_ctask->r2ts); | |
7ba24713 | 2114 | } |
7ba24713 AA |
2115 | } |
2116 | ||
2117 | static int | |
7b7232f3 | 2118 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
5c75b7fc | 2119 | char *buf, int buflen) |
7ba24713 | 2120 | { |
7b7232f3 | 2121 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 2122 | struct iscsi_session *session = conn->session; |
5bb0b55a | 2123 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
5c75b7fc | 2124 | int value; |
7ba24713 | 2125 | |
7ba24713 | 2126 | switch(param) { |
7ba24713 | 2127 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 2128 | iscsi_set_param(cls_conn, param, buf, buflen); |
5bb0b55a | 2129 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
7ba24713 | 2130 | if (conn->hdrdgst_en) { |
5bb0b55a MC |
2131 | tcp_conn->hdr_size += sizeof(__u32); |
2132 | if (!tcp_conn->tx_tfm) | |
2133 | tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c", | |
2134 | 0); | |
2135 | if (!tcp_conn->tx_tfm) | |
7ba24713 | 2136 | return -ENOMEM; |
5bb0b55a MC |
2137 | if (!tcp_conn->rx_tfm) |
2138 | tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c", | |
2139 | 0); | |
2140 | if (!tcp_conn->rx_tfm) { | |
2141 | crypto_free_tfm(tcp_conn->tx_tfm); | |
7ba24713 AA |
2142 | return -ENOMEM; |
2143 | } | |
2144 | } else { | |
5bb0b55a MC |
2145 | if (tcp_conn->tx_tfm) |
2146 | crypto_free_tfm(tcp_conn->tx_tfm); | |
2147 | if (tcp_conn->rx_tfm) | |
2148 | crypto_free_tfm(tcp_conn->rx_tfm); | |
7ba24713 AA |
2149 | } |
2150 | break; | |
2151 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 2152 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 | 2153 | if (conn->datadgst_en) { |
5bb0b55a MC |
2154 | if (!tcp_conn->data_tx_tfm) |
2155 | tcp_conn->data_tx_tfm = | |
7ba24713 | 2156 | crypto_alloc_tfm("crc32c", 0); |
5bb0b55a | 2157 | if (!tcp_conn->data_tx_tfm) |
7ba24713 | 2158 | return -ENOMEM; |
5bb0b55a MC |
2159 | if (!tcp_conn->data_rx_tfm) |
2160 | tcp_conn->data_rx_tfm = | |
7ba24713 | 2161 | crypto_alloc_tfm("crc32c", 0); |
5bb0b55a MC |
2162 | if (!tcp_conn->data_rx_tfm) { |
2163 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
7ba24713 AA |
2164 | return -ENOMEM; |
2165 | } | |
2166 | } else { | |
5bb0b55a MC |
2167 | if (tcp_conn->data_tx_tfm) |
2168 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
2169 | if (tcp_conn->data_rx_tfm) | |
2170 | crypto_free_tfm(tcp_conn->data_rx_tfm); | |
7ba24713 | 2171 | } |
5bb0b55a MC |
2172 | tcp_conn->sendpage = conn->datadgst_en ? |
2173 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 | 2174 | break; |
7ba24713 | 2175 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 2176 | sscanf(buf, "%d", &value); |
7ba24713 AA |
2177 | if (session->max_r2t == roundup_pow_of_two(value)) |
2178 | break; | |
2179 | iscsi_r2tpool_free(session); | |
5c75b7fc | 2180 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2181 | if (session->max_r2t & (session->max_r2t - 1)) |
2182 | session->max_r2t = roundup_pow_of_two(session->max_r2t); | |
2183 | if (iscsi_r2tpool_alloc(session)) | |
2184 | return -ENOMEM; | |
2185 | break; | |
7ba24713 | 2186 | default: |
5c75b7fc | 2187 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
2188 | } |
2189 | ||
2190 | return 0; | |
2191 | } | |
2192 | ||
2193 | static int | |
5c75b7fc MC |
2194 | iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
2195 | enum iscsi_param param, char *buf) | |
7b8631b5 | 2196 | { |
7b7232f3 | 2197 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2198 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
fd7255f5 | 2199 | struct inet_sock *inet; |
5c75b7fc MC |
2200 | struct ipv6_pinfo *np; |
2201 | struct sock *sk; | |
2202 | int len; | |
7b8631b5 MC |
2203 | |
2204 | switch(param) { | |
fd7255f5 MC |
2205 | case ISCSI_PARAM_CONN_PORT: |
2206 | mutex_lock(&conn->xmitmutex); | |
5bb0b55a | 2207 | if (!tcp_conn->sock) { |
fd7255f5 MC |
2208 | mutex_unlock(&conn->xmitmutex); |
2209 | return -EINVAL; | |
2210 | } | |
2211 | ||
5bb0b55a | 2212 | inet = inet_sk(tcp_conn->sock->sk); |
5c75b7fc | 2213 | len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport)); |
fd7255f5 | 2214 | mutex_unlock(&conn->xmitmutex); |
8d2860b3 | 2215 | break; |
fd7255f5 MC |
2216 | case ISCSI_PARAM_CONN_ADDRESS: |
2217 | mutex_lock(&conn->xmitmutex); | |
5bb0b55a | 2218 | if (!tcp_conn->sock) { |
fd7255f5 MC |
2219 | mutex_unlock(&conn->xmitmutex); |
2220 | return -EINVAL; | |
2221 | } | |
2222 | ||
5bb0b55a | 2223 | sk = tcp_conn->sock->sk; |
fd7255f5 MC |
2224 | if (sk->sk_family == PF_INET) { |
2225 | inet = inet_sk(sk); | |
2226 | len = sprintf(buf, "%u.%u.%u.%u\n", | |
2227 | NIPQUAD(inet->daddr)); | |
2228 | } else { | |
2229 | np = inet6_sk(sk); | |
2230 | len = sprintf(buf, | |
2231 | "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
2232 | NIP6(np->daddr)); | |
2233 | } | |
2234 | mutex_unlock(&conn->xmitmutex); | |
2235 | break; | |
2236 | default: | |
5c75b7fc | 2237 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
2238 | } |
2239 | ||
2240 | return len; | |
2241 | } | |
2242 | ||
7ba24713 | 2243 | static void |
7b7232f3 | 2244 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 2245 | { |
7b7232f3 | 2246 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2247 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
2248 | |
2249 | stats->txdata_octets = conn->txdata_octets; | |
2250 | stats->rxdata_octets = conn->rxdata_octets; | |
2251 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
2252 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
2253 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
2254 | stats->datain_pdus = conn->datain_pdus_cnt; | |
2255 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
2256 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
2257 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
2258 | stats->custom_length = 3; | |
2259 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 2260 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 2261 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 2262 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
2263 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
2264 | stats->custom[2].value = conn->eh_abort_cnt; | |
2265 | } | |
2266 | ||
5bb0b55a MC |
2267 | static struct iscsi_cls_session * |
2268 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, | |
2269 | struct scsi_transport_template *scsit, | |
2270 | uint32_t initial_cmdsn, uint32_t *hostno) | |
7ba24713 | 2271 | { |
5bb0b55a MC |
2272 | struct iscsi_cls_session *cls_session; |
2273 | struct iscsi_session *session; | |
2274 | uint32_t hn; | |
2275 | int cmd_i; | |
7ba24713 | 2276 | |
5bb0b55a MC |
2277 | cls_session = iscsi_session_setup(iscsit, scsit, |
2278 | sizeof(struct iscsi_tcp_cmd_task), | |
2279 | sizeof(struct iscsi_tcp_mgmt_task), | |
2280 | initial_cmdsn, &hn); | |
2281 | if (!cls_session) | |
2282 | return NULL; | |
2283 | *hostno = hn; | |
7ba24713 | 2284 | |
5bb0b55a MC |
2285 | session = class_to_transport_session(cls_session); |
2286 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2287 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
2288 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2289 | ||
2290 | ctask->hdr = &tcp_ctask->hdr; | |
2291 | } | |
2292 | ||
2293 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
2294 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
2295 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
2296 | ||
2297 | mtask->hdr = &tcp_mtask->hdr; | |
2298 | } | |
2299 | ||
2300 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) | |
2301 | goto r2tpool_alloc_fail; | |
2302 | ||
2303 | return cls_session; | |
2304 | ||
2305 | r2tpool_alloc_fail: | |
2306 | iscsi_session_teardown(cls_session); | |
2307 | return NULL; | |
2308 | } | |
2309 | ||
2310 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
2311 | { | |
5bb0b55a MC |
2312 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
2313 | iscsi_session_teardown(cls_session); | |
7ba24713 AA |
2314 | } |
2315 | ||
5bb0b55a | 2316 | static struct scsi_host_template iscsi_sht = { |
f4246b33 | 2317 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
2318 | .queuecommand = iscsi_queuecommand, |
2319 | .change_queue_depth = iscsi_change_queue_depth, | |
2320 | .can_queue = ISCSI_XMIT_CMDS_MAX - 1, | |
2321 | .sg_tablesize = ISCSI_SG_TABLESIZE, | |
2322 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, | |
2323 | .eh_abort_handler = iscsi_eh_abort, | |
2324 | .eh_host_reset_handler = iscsi_eh_host_reset, | |
2325 | .use_clustering = DISABLE_CLUSTERING, | |
2326 | .proc_name = "iscsi_tcp", | |
2327 | .this_id = -1, | |
2328 | }; | |
2329 | ||
7ba24713 AA |
2330 | static struct iscsi_transport iscsi_tcp_transport = { |
2331 | .owner = THIS_MODULE, | |
2332 | .name = "tcp", | |
2333 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
2334 | | CAP_DATADGST, | |
fd7255f5 MC |
2335 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
2336 | ISCSI_MAX_XMIT_DLENGTH | | |
2337 | ISCSI_HDRDGST_EN | | |
2338 | ISCSI_DATADGST_EN | | |
2339 | ISCSI_INITIAL_R2T_EN | | |
2340 | ISCSI_MAX_R2T | | |
2341 | ISCSI_IMM_DATA_EN | | |
2342 | ISCSI_FIRST_BURST | | |
2343 | ISCSI_MAX_BURST | | |
2344 | ISCSI_PDU_INORDER_EN | | |
2345 | ISCSI_DATASEQ_INORDER_EN | | |
2346 | ISCSI_ERL | | |
2347 | ISCSI_CONN_PORT | | |
8d2860b3 | 2348 | ISCSI_CONN_ADDRESS | |
5c75b7fc MC |
2349 | ISCSI_EXP_STATSN | |
2350 | ISCSI_PERSISTENT_PORT | | |
2351 | ISCSI_PERSISTENT_ADDRESS | | |
2352 | ISCSI_TARGET_NAME | | |
2353 | ISCSI_TPGT, | |
7ba24713 | 2354 | .host_template = &iscsi_sht, |
7b8631b5 | 2355 | .conndata_size = sizeof(struct iscsi_conn), |
7ba24713 AA |
2356 | .max_conn = 1, |
2357 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, | |
5bb0b55a MC |
2358 | /* session management */ |
2359 | .create_session = iscsi_tcp_session_create, | |
2360 | .destroy_session = iscsi_tcp_session_destroy, | |
2361 | /* connection management */ | |
2362 | .create_conn = iscsi_tcp_conn_create, | |
2363 | .bind_conn = iscsi_tcp_conn_bind, | |
2364 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 2365 | .set_param = iscsi_conn_set_param, |
5c75b7fc | 2366 | .get_conn_param = iscsi_tcp_conn_get_param, |
7b8631b5 | 2367 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 2368 | .start_conn = iscsi_conn_start, |
1c83469d | 2369 | .stop_conn = iscsi_tcp_conn_stop, |
5bb0b55a | 2370 | /* IO */ |
7ba24713 AA |
2371 | .send_pdu = iscsi_conn_send_pdu, |
2372 | .get_stats = iscsi_conn_get_stats, | |
5bb0b55a MC |
2373 | .init_cmd_task = iscsi_tcp_cmd_init, |
2374 | .init_mgmt_task = iscsi_tcp_mgmt_init, | |
2375 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, | |
2376 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2377 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2378 | /* recovery */ | |
30a6c652 | 2379 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
2380 | }; |
2381 | ||
2382 | static int __init | |
2383 | iscsi_tcp_init(void) | |
2384 | { | |
7ba24713 | 2385 | if (iscsi_max_lun < 1) { |
be2df72e OG |
2386 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
2387 | iscsi_max_lun); | |
7ba24713 AA |
2388 | return -EINVAL; |
2389 | } | |
2390 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
2391 | ||
7b8631b5 | 2392 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
ffbfe925 | 2393 | return -ENODEV; |
7ba24713 | 2394 | |
7b8631b5 | 2395 | return 0; |
7ba24713 AA |
2396 | } |
2397 | ||
2398 | static void __exit | |
2399 | iscsi_tcp_exit(void) | |
2400 | { | |
2401 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
7ba24713 AA |
2402 | } |
2403 | ||
2404 | module_init(iscsi_tcp_init); | |
2405 | module_exit(iscsi_tcp_exit); |