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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 | ||
f70e9c5f | 46 | #define ISCSI_TCP_VERSION "1.0-595" |
e0ecae8d | 47 | |
7ba24713 AA |
48 | MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, " |
49 | "Alex Aizman <itn780@yahoo.com>"); | |
50 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
51 | MODULE_LICENSE("GPL"); | |
e0ecae8d | 52 | MODULE_VERSION(ISCSI_TCP_VERSION); |
7ba24713 | 53 | /* #define DEBUG_TCP */ |
7ba24713 AA |
54 | #define DEBUG_ASSERT |
55 | ||
56 | #ifdef DEBUG_TCP | |
5bb0b55a | 57 | #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) |
7ba24713 AA |
58 | #else |
59 | #define debug_tcp(fmt...) | |
60 | #endif | |
61 | ||
7ba24713 AA |
62 | #ifndef DEBUG_ASSERT |
63 | #ifdef BUG_ON | |
64 | #undef BUG_ON | |
65 | #endif | |
66 | #define BUG_ON(expr) | |
67 | #endif | |
68 | ||
7ba24713 AA |
69 | static unsigned int iscsi_max_lun = 512; |
70 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
71 | ||
7ba24713 AA |
72 | static inline void |
73 | iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size) | |
74 | { | |
7cae5159 MC |
75 | ibuf->sg.page = virt_to_page(vbuf); |
76 | ibuf->sg.offset = offset_in_page(vbuf); | |
7ba24713 AA |
77 | ibuf->sg.length = size; |
78 | ibuf->sent = 0; | |
7cae5159 | 79 | ibuf->use_sendmsg = 1; |
7ba24713 AA |
80 | } |
81 | ||
82 | static inline void | |
83 | iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg) | |
84 | { | |
7cae5159 MC |
85 | ibuf->sg.page = sg->page; |
86 | ibuf->sg.offset = sg->offset; | |
87 | ibuf->sg.length = sg->length; | |
7ba24713 AA |
88 | /* |
89 | * Fastpath: sg element fits into single page | |
90 | */ | |
a1e80c20 | 91 | if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page)) |
7cae5159 MC |
92 | ibuf->use_sendmsg = 0; |
93 | else | |
94 | ibuf->use_sendmsg = 1; | |
7ba24713 AA |
95 | ibuf->sent = 0; |
96 | } | |
97 | ||
98 | static inline int | |
99 | iscsi_buf_left(struct iscsi_buf *ibuf) | |
100 | { | |
101 | int rc; | |
102 | ||
103 | rc = ibuf->sg.length - ibuf->sent; | |
104 | BUG_ON(rc < 0); | |
105 | return rc; | |
106 | } | |
107 | ||
108 | static inline void | |
af973481 MC |
109 | iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, |
110 | u8* crc) | |
7ba24713 | 111 | { |
5bb0b55a | 112 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 113 | |
5bb0b55a MC |
114 | crypto_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc); |
115 | buf->sg.length += sizeof(uint32_t); | |
7ba24713 AA |
116 | } |
117 | ||
118 | static inline int | |
5bb0b55a | 119 | iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 120 | { |
5bb0b55a | 121 | struct sk_buff *skb = tcp_conn->in.skb; |
7ba24713 | 122 | |
5bb0b55a | 123 | tcp_conn->in.zero_copy_hdr = 0; |
7ba24713 | 124 | |
5bb0b55a MC |
125 | if (tcp_conn->in.copy >= tcp_conn->hdr_size && |
126 | tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) { | |
7ba24713 AA |
127 | /* |
128 | * Zero-copy PDU Header: using connection context | |
129 | * to store header pointer. | |
130 | */ | |
131 | if (skb_shinfo(skb)->frag_list == NULL && | |
5bb0b55a MC |
132 | !skb_shinfo(skb)->nr_frags) { |
133 | tcp_conn->in.hdr = (struct iscsi_hdr *) | |
134 | ((char*)skb->data + tcp_conn->in.offset); | |
135 | tcp_conn->in.zero_copy_hdr = 1; | |
136 | } else { | |
7ba24713 AA |
137 | /* ignoring return code since we checked |
138 | * in.copy before */ | |
5bb0b55a MC |
139 | skb_copy_bits(skb, tcp_conn->in.offset, |
140 | &tcp_conn->hdr, tcp_conn->hdr_size); | |
141 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
7ba24713 | 142 | } |
5bb0b55a MC |
143 | tcp_conn->in.offset += tcp_conn->hdr_size; |
144 | tcp_conn->in.copy -= tcp_conn->hdr_size; | |
7ba24713 AA |
145 | } else { |
146 | int hdr_remains; | |
147 | int copylen; | |
148 | ||
149 | /* | |
150 | * PDU header scattered across SKB's, | |
151 | * copying it... This'll happen quite rarely. | |
152 | */ | |
153 | ||
5bb0b55a MC |
154 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) |
155 | tcp_conn->in.hdr_offset = 0; | |
7ba24713 | 156 | |
5bb0b55a | 157 | hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset; |
7ba24713 AA |
158 | BUG_ON(hdr_remains <= 0); |
159 | ||
5bb0b55a MC |
160 | copylen = min(tcp_conn->in.copy, hdr_remains); |
161 | skb_copy_bits(skb, tcp_conn->in.offset, | |
162 | (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset, | |
163 | copylen); | |
7ba24713 AA |
164 | |
165 | debug_tcp("PDU gather offset %d bytes %d in.offset %d " | |
5bb0b55a MC |
166 | "in.copy %d\n", tcp_conn->in.hdr_offset, copylen, |
167 | tcp_conn->in.offset, tcp_conn->in.copy); | |
7ba24713 | 168 | |
5bb0b55a MC |
169 | tcp_conn->in.offset += copylen; |
170 | tcp_conn->in.copy -= copylen; | |
7ba24713 | 171 | if (copylen < hdr_remains) { |
5bb0b55a MC |
172 | tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER; |
173 | tcp_conn->in.hdr_offset += copylen; | |
7ba24713 AA |
174 | return -EAGAIN; |
175 | } | |
5bb0b55a MC |
176 | tcp_conn->in.hdr = &tcp_conn->hdr; |
177 | tcp_conn->discontiguous_hdr_cnt++; | |
178 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
179 | } |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
30a6c652 MC |
184 | /* |
185 | * must be called with session lock | |
186 | */ | |
187 | static void | |
188 | __iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
7ba24713 | 189 | { |
5bb0b55a | 190 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
30a6c652 | 191 | struct scsi_cmnd *sc; |
7ba24713 | 192 | |
30a6c652 MC |
193 | sc = ctask->sc; |
194 | if (unlikely(!sc)) | |
7ba24713 | 195 | return; |
30a6c652 | 196 | |
5bb0b55a MC |
197 | tcp_ctask->xmstate = XMSTATE_IDLE; |
198 | tcp_ctask->r2t = NULL; | |
7ba24713 AA |
199 | } |
200 | ||
201 | /** | |
202 | * iscsi_data_rsp - SCSI Data-In Response processing | |
203 | * @conn: iscsi connection | |
204 | * @ctask: scsi command task | |
205 | **/ | |
206 | static int | |
207 | iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
208 | { | |
209 | int rc; | |
5bb0b55a MC |
210 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
211 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
212 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; | |
7ba24713 AA |
213 | struct iscsi_session *session = conn->session; |
214 | int datasn = be32_to_cpu(rhdr->datasn); | |
215 | ||
216 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
217 | if (rc) | |
218 | return rc; | |
219 | /* | |
220 | * setup Data-In byte counter (gets decremented..) | |
221 | */ | |
5bb0b55a | 222 | ctask->data_count = tcp_conn->in.datalen; |
7ba24713 | 223 | |
5bb0b55a | 224 | if (tcp_conn->in.datalen == 0) |
7ba24713 AA |
225 | return 0; |
226 | ||
227 | if (ctask->datasn != datasn) | |
228 | return ISCSI_ERR_DATASN; | |
229 | ||
230 | ctask->datasn++; | |
231 | ||
5bb0b55a MC |
232 | tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); |
233 | if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length) | |
7ba24713 AA |
234 | return ISCSI_ERR_DATA_OFFSET; |
235 | ||
236 | if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
237 | struct scsi_cmnd *sc = ctask->sc; | |
238 | ||
239 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
bf310b8f | 240 | if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) { |
7ba24713 AA |
241 | int res_count = be32_to_cpu(rhdr->residual_count); |
242 | ||
243 | if (res_count > 0 && | |
244 | res_count <= sc->request_bufflen) { | |
245 | sc->resid = res_count; | |
246 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
247 | } else | |
248 | sc->result = (DID_BAD_TARGET << 16) | | |
249 | rhdr->cmd_status; | |
bf310b8f | 250 | } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) { |
7ba24713 AA |
251 | sc->resid = be32_to_cpu(rhdr->residual_count); |
252 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
253 | } else | |
254 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
255 | } | |
256 | ||
257 | conn->datain_pdus_cnt++; | |
258 | return 0; | |
259 | } | |
260 | ||
261 | /** | |
262 | * iscsi_solicit_data_init - initialize first Data-Out | |
263 | * @conn: iscsi connection | |
264 | * @ctask: scsi command task | |
265 | * @r2t: R2T info | |
266 | * | |
267 | * Notes: | |
268 | * Initialize first Data-Out within this R2T sequence and finds | |
269 | * proper data_offset within this SCSI command. | |
270 | * | |
271 | * This function is called with connection lock taken. | |
272 | **/ | |
273 | static void | |
274 | iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
275 | struct iscsi_r2t_info *r2t) | |
276 | { | |
277 | struct iscsi_data *hdr; | |
7ba24713 | 278 | struct scsi_cmnd *sc = ctask->sc; |
5bb0b55a | 279 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 280 | |
ffbfe925 | 281 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
282 | memset(hdr, 0, sizeof(struct iscsi_data)); |
283 | hdr->ttt = r2t->ttt; | |
284 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
285 | r2t->solicit_datasn++; | |
286 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
287 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
288 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
289 | hdr->exp_statsn = r2t->exp_statsn; |
290 | hdr->offset = cpu_to_be32(r2t->data_offset); | |
291 | if (r2t->data_length > conn->max_xmit_dlength) { | |
292 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
293 | r2t->data_count = conn->max_xmit_dlength; | |
294 | hdr->flags = 0; | |
295 | } else { | |
296 | hton24(hdr->dlength, r2t->data_length); | |
297 | r2t->data_count = r2t->data_length; | |
298 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
299 | } | |
300 | conn->dataout_pdus_cnt++; | |
301 | ||
302 | r2t->sent = 0; | |
303 | ||
6e458cc9 | 304 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 305 | sizeof(struct iscsi_hdr)); |
7ba24713 | 306 | |
7ba24713 AA |
307 | if (sc->use_sg) { |
308 | int i, sg_count = 0; | |
309 | struct scatterlist *sg = sc->request_buffer; | |
310 | ||
311 | r2t->sg = NULL; | |
312 | for (i = 0; i < sc->use_sg; i++, sg += 1) { | |
313 | /* FIXME: prefetch ? */ | |
314 | if (sg_count + sg->length > r2t->data_offset) { | |
315 | int page_offset; | |
316 | ||
317 | /* sg page found! */ | |
318 | ||
319 | /* offset within this page */ | |
320 | page_offset = r2t->data_offset - sg_count; | |
321 | ||
322 | /* fill in this buffer */ | |
323 | iscsi_buf_init_sg(&r2t->sendbuf, sg); | |
324 | r2t->sendbuf.sg.offset += page_offset; | |
325 | r2t->sendbuf.sg.length -= page_offset; | |
326 | ||
327 | /* xmit logic will continue with next one */ | |
328 | r2t->sg = sg + 1; | |
329 | break; | |
330 | } | |
331 | sg_count += sg->length; | |
332 | } | |
333 | BUG_ON(r2t->sg == NULL); | |
334 | } else | |
5bb0b55a | 335 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
7ba24713 AA |
336 | (char*)sc->request_buffer + r2t->data_offset, |
337 | r2t->data_count); | |
7ba24713 AA |
338 | } |
339 | ||
340 | /** | |
341 | * iscsi_r2t_rsp - iSCSI R2T Response processing | |
342 | * @conn: iscsi connection | |
343 | * @ctask: scsi command task | |
344 | **/ | |
345 | static int | |
346 | iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
347 | { | |
348 | struct iscsi_r2t_info *r2t; | |
349 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
350 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
351 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
352 | struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; | |
7ba24713 AA |
353 | int r2tsn = be32_to_cpu(rhdr->r2tsn); |
354 | int rc; | |
355 | ||
5bb0b55a | 356 | if (tcp_conn->in.datalen) |
7ba24713 AA |
357 | return ISCSI_ERR_DATALEN; |
358 | ||
5bb0b55a | 359 | if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn) |
7ba24713 AA |
360 | return ISCSI_ERR_R2TSN; |
361 | ||
362 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
363 | if (rc) | |
364 | return rc; | |
365 | ||
366 | /* FIXME: use R2TSN to detect missing R2T */ | |
367 | ||
368 | /* fill-in new R2T associated with the task */ | |
369 | spin_lock(&session->lock); | |
370 | if (!ctask->sc || ctask->mtask || | |
371 | session->state != ISCSI_STATE_LOGGED_IN) { | |
372 | printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " | |
373 | "recovery...\n", ctask->itt); | |
374 | spin_unlock(&session->lock); | |
375 | return 0; | |
376 | } | |
5bb0b55a | 377 | rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 AA |
378 | BUG_ON(!rc); |
379 | ||
380 | r2t->exp_statsn = rhdr->statsn; | |
381 | r2t->data_length = be32_to_cpu(rhdr->data_length); | |
382 | if (r2t->data_length == 0 || | |
383 | r2t->data_length > session->max_burst) { | |
384 | spin_unlock(&session->lock); | |
385 | return ISCSI_ERR_DATALEN; | |
386 | } | |
387 | ||
388 | r2t->data_offset = be32_to_cpu(rhdr->data_offset); | |
389 | if (r2t->data_offset + r2t->data_length > ctask->total_length) { | |
390 | spin_unlock(&session->lock); | |
391 | return ISCSI_ERR_DATALEN; | |
392 | } | |
393 | ||
394 | r2t->ttt = rhdr->ttt; /* no flip */ | |
395 | r2t->solicit_datasn = 0; | |
396 | ||
397 | iscsi_solicit_data_init(conn, ctask, r2t); | |
398 | ||
5bb0b55a MC |
399 | tcp_ctask->exp_r2tsn = r2tsn + 1; |
400 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
401 | __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); | |
402 | __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*)); | |
7ba24713 | 403 | |
55e3299d | 404 | scsi_queue_work(session->host, &conn->xmitwork); |
7ba24713 AA |
405 | conn->r2t_pdus_cnt++; |
406 | spin_unlock(&session->lock); | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
411 | static int | |
5bb0b55a | 412 | iscsi_tcp_hdr_recv(struct iscsi_conn *conn) |
7ba24713 | 413 | { |
5bb0b55a | 414 | int rc = 0, opcode, ahslen; |
7ba24713 | 415 | struct iscsi_hdr *hdr; |
7ba24713 | 416 | struct iscsi_session *session = conn->session; |
5bb0b55a MC |
417 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
418 | uint32_t cdgst, rdgst = 0, itt; | |
7ba24713 | 419 | |
5bb0b55a | 420 | hdr = tcp_conn->in.hdr; |
7ba24713 AA |
421 | |
422 | /* verify PDU length */ | |
5bb0b55a MC |
423 | tcp_conn->in.datalen = ntoh24(hdr->dlength); |
424 | if (tcp_conn->in.datalen > conn->max_recv_dlength) { | |
7ba24713 | 425 | printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", |
5bb0b55a | 426 | tcp_conn->in.datalen, conn->max_recv_dlength); |
7ba24713 AA |
427 | return ISCSI_ERR_DATALEN; |
428 | } | |
5bb0b55a | 429 | tcp_conn->data_copied = 0; |
7ba24713 AA |
430 | |
431 | /* read AHS */ | |
5bb0b55a MC |
432 | ahslen = hdr->hlength << 2; |
433 | tcp_conn->in.offset += ahslen; | |
434 | tcp_conn->in.copy -= ahslen; | |
435 | if (tcp_conn->in.copy < 0) { | |
7ba24713 | 436 | printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " |
5bb0b55a | 437 | "%d bytes\n", ahslen); |
7ba24713 AA |
438 | return ISCSI_ERR_AHSLEN; |
439 | } | |
440 | ||
441 | /* calculate read padding */ | |
5bb0b55a MC |
442 | tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1); |
443 | if (tcp_conn->in.padding) { | |
444 | tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding; | |
445 | debug_scsi("read padding %d bytes\n", tcp_conn->in.padding); | |
7ba24713 AA |
446 | } |
447 | ||
448 | if (conn->hdrdgst_en) { | |
449 | struct scatterlist sg; | |
450 | ||
451 | sg_init_one(&sg, (u8 *)hdr, | |
5bb0b55a MC |
452 | sizeof(struct iscsi_hdr) + ahslen); |
453 | crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst); | |
7ba24713 | 454 | rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + |
5bb0b55a | 455 | ahslen); |
8a47cd34 | 456 | if (cdgst != rdgst) { |
5bb0b55a MC |
457 | printk(KERN_ERR "iscsi_tcp: hdrdgst error " |
458 | "recv 0x%x calc 0x%x\n", rdgst, cdgst); | |
8a47cd34 MC |
459 | return ISCSI_ERR_HDR_DGST; |
460 | } | |
7ba24713 AA |
461 | } |
462 | ||
5bb0b55a | 463 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
7ba24713 | 464 | /* verify itt (itt encoding: age+cid+itt) */ |
5bb0b55a MC |
465 | rc = iscsi_verify_itt(conn, hdr, &itt); |
466 | if (rc == ISCSI_ERR_NO_SCSI_CMD) { | |
467 | tcp_conn->in.datalen = 0; /* force drop */ | |
468 | return 0; | |
469 | } else if (rc) | |
470 | return rc; | |
7ba24713 AA |
471 | |
472 | debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", | |
5bb0b55a MC |
473 | opcode, tcp_conn->in.offset, tcp_conn->in.copy, |
474 | ahslen, tcp_conn->in.datalen); | |
7ba24713 | 475 | |
5bb0b55a MC |
476 | switch(opcode) { |
477 | case ISCSI_OP_SCSI_DATA_IN: | |
478 | tcp_conn->in.ctask = session->cmds[itt]; | |
479 | rc = iscsi_data_rsp(conn, tcp_conn->in.ctask); | |
480 | /* fall through */ | |
481 | case ISCSI_OP_SCSI_CMD_RSP: | |
482 | tcp_conn->in.ctask = session->cmds[itt]; | |
483 | if (tcp_conn->in.datalen) | |
484 | goto copy_hdr; | |
7ba24713 | 485 | |
5bb0b55a MC |
486 | spin_lock(&session->lock); |
487 | __iscsi_ctask_cleanup(conn, tcp_conn->in.ctask); | |
488 | rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); | |
489 | spin_unlock(&session->lock); | |
490 | break; | |
491 | case ISCSI_OP_R2T: | |
492 | tcp_conn->in.ctask = session->cmds[itt]; | |
493 | if (ahslen) | |
494 | rc = ISCSI_ERR_AHSLEN; | |
495 | else if (tcp_conn->in.ctask->sc->sc_data_direction == | |
496 | DMA_TO_DEVICE) | |
497 | rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); | |
498 | else | |
499 | rc = ISCSI_ERR_PROTO; | |
500 | break; | |
501 | case ISCSI_OP_LOGIN_RSP: | |
502 | case ISCSI_OP_TEXT_RSP: | |
503 | case ISCSI_OP_LOGOUT_RSP: | |
504 | case ISCSI_OP_NOOP_IN: | |
505 | case ISCSI_OP_REJECT: | |
506 | case ISCSI_OP_ASYNC_EVENT: | |
507 | if (tcp_conn->in.datalen) | |
508 | goto copy_hdr; | |
509 | /* fall through */ | |
510 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
511 | rc = iscsi_complete_pdu(conn, hdr, NULL, 0); | |
512 | break; | |
513 | default: | |
514 | rc = ISCSI_ERR_BAD_OPCODE; | |
515 | break; | |
516 | } | |
7ba24713 AA |
517 | |
518 | return rc; | |
5bb0b55a MC |
519 | |
520 | copy_hdr: | |
521 | /* | |
522 | * if we did zero copy for the header but we will need multiple | |
523 | * skbs to complete the command then we have to copy the header | |
524 | * for later use | |
525 | */ | |
526 | if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy < | |
527 | (tcp_conn->in.datalen + tcp_conn->in.padding + | |
528 | (conn->datadgst_en ? 4 : 0))) { | |
529 | debug_tcp("Copying header for later use. in.copy %d in.datalen" | |
530 | " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); | |
531 | memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, | |
532 | sizeof(struct iscsi_hdr)); | |
533 | tcp_conn->in.hdr = &tcp_conn->hdr; | |
534 | tcp_conn->in.zero_copy_hdr = 0; | |
535 | } | |
536 | return 0; | |
7ba24713 AA |
537 | } |
538 | ||
539 | /** | |
540 | * iscsi_ctask_copy - copy skb bits to the destanation cmd task | |
5bb0b55a | 541 | * @conn: iscsi tcp connection |
7ba24713 AA |
542 | * @ctask: scsi command task |
543 | * @buf: buffer to copy to | |
544 | * @buf_size: size of buffer | |
545 | * @offset: offset within the buffer | |
546 | * | |
547 | * Notes: | |
548 | * The function calls skb_copy_bits() and updates per-connection and | |
549 | * per-cmd byte counters. | |
550 | * | |
551 | * Read counters (in bytes): | |
552 | * | |
553 | * conn->in.offset offset within in progress SKB | |
554 | * conn->in.copy left to copy from in progress SKB | |
555 | * including padding | |
556 | * conn->in.copied copied already from in progress SKB | |
557 | * conn->data_copied copied already from in progress buffer | |
558 | * ctask->sent total bytes sent up to the MidLayer | |
559 | * ctask->data_count left to copy from in progress Data-In | |
560 | * buf_left left to copy from in progress buffer | |
561 | **/ | |
562 | static inline int | |
5bb0b55a | 563 | iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, |
7ba24713 AA |
564 | void *buf, int buf_size, int offset) |
565 | { | |
5bb0b55a MC |
566 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
567 | int buf_left = buf_size - (tcp_conn->data_copied + offset); | |
568 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
569 | int rc; |
570 | ||
571 | size = min(size, ctask->data_count); | |
572 | ||
573 | debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 574 | size, tcp_conn->in.offset, tcp_conn->in.copied); |
7ba24713 AA |
575 | |
576 | BUG_ON(size <= 0); | |
5bb0b55a | 577 | BUG_ON(tcp_ctask->sent + size > ctask->total_length); |
7ba24713 | 578 | |
5bb0b55a MC |
579 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
580 | (char*)buf + (offset + tcp_conn->data_copied), size); | |
7ba24713 AA |
581 | /* must fit into skb->len */ |
582 | BUG_ON(rc); | |
583 | ||
5bb0b55a MC |
584 | tcp_conn->in.offset += size; |
585 | tcp_conn->in.copy -= size; | |
586 | tcp_conn->in.copied += size; | |
587 | tcp_conn->data_copied += size; | |
588 | tcp_ctask->sent += size; | |
7ba24713 AA |
589 | ctask->data_count -= size; |
590 | ||
5bb0b55a | 591 | BUG_ON(tcp_conn->in.copy < 0); |
7ba24713 AA |
592 | BUG_ON(ctask->data_count < 0); |
593 | ||
5bb0b55a | 594 | if (buf_size != (tcp_conn->data_copied + offset)) { |
7ba24713 | 595 | if (!ctask->data_count) { |
5bb0b55a | 596 | BUG_ON(buf_size - tcp_conn->data_copied < 0); |
7ba24713 | 597 | /* done with this PDU */ |
5bb0b55a | 598 | return buf_size - tcp_conn->data_copied; |
7ba24713 AA |
599 | } |
600 | return -EAGAIN; | |
601 | } | |
602 | ||
603 | /* done with this buffer or with both - PDU and buffer */ | |
5bb0b55a | 604 | tcp_conn->data_copied = 0; |
7ba24713 AA |
605 | return 0; |
606 | } | |
607 | ||
608 | /** | |
609 | * iscsi_tcp_copy - copy skb bits to the destanation buffer | |
5bb0b55a | 610 | * @conn: iscsi tcp connection |
7ba24713 AA |
611 | * |
612 | * Notes: | |
613 | * The function calls skb_copy_bits() and updates per-connection | |
614 | * byte counters. | |
615 | **/ | |
616 | static inline int | |
5bb0b55a | 617 | iscsi_tcp_copy(struct iscsi_tcp_conn *tcp_conn) |
7ba24713 | 618 | { |
5bb0b55a MC |
619 | void *buf = tcp_conn->data; |
620 | int buf_size = tcp_conn->in.datalen; | |
621 | int buf_left = buf_size - tcp_conn->data_copied; | |
622 | int size = min(tcp_conn->in.copy, buf_left); | |
7ba24713 AA |
623 | int rc; |
624 | ||
625 | debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", | |
5bb0b55a | 626 | size, tcp_conn->in.offset, tcp_conn->data_copied); |
7ba24713 AA |
627 | BUG_ON(size <= 0); |
628 | ||
5bb0b55a MC |
629 | rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, |
630 | (char*)buf + tcp_conn->data_copied, size); | |
7ba24713 AA |
631 | BUG_ON(rc); |
632 | ||
5bb0b55a MC |
633 | tcp_conn->in.offset += size; |
634 | tcp_conn->in.copy -= size; | |
635 | tcp_conn->in.copied += size; | |
636 | tcp_conn->data_copied += size; | |
7ba24713 | 637 | |
5bb0b55a | 638 | if (buf_size != tcp_conn->data_copied) |
7ba24713 AA |
639 | return -EAGAIN; |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | static inline void | |
5bb0b55a MC |
645 | partial_sg_digest_update(struct iscsi_tcp_conn *tcp_conn, |
646 | struct scatterlist *sg, int offset, int length) | |
7ba24713 AA |
647 | { |
648 | struct scatterlist temp; | |
649 | ||
650 | memcpy(&temp, sg, sizeof(struct scatterlist)); | |
651 | temp.offset = offset; | |
652 | temp.length = length; | |
5bb0b55a | 653 | crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1); |
7ba24713 AA |
654 | } |
655 | ||
f6cfba1d | 656 | static void |
5bb0b55a | 657 | iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) |
f6cfba1d MC |
658 | { |
659 | struct scatterlist tmp; | |
660 | ||
661 | sg_init_one(&tmp, buf, len); | |
5bb0b55a | 662 | crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1); |
f6cfba1d MC |
663 | } |
664 | ||
7ba24713 AA |
665 | static int iscsi_scsi_data_in(struct iscsi_conn *conn) |
666 | { | |
5bb0b55a MC |
667 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
668 | struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; | |
669 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 670 | struct scsi_cmnd *sc = ctask->sc; |
f6cfba1d | 671 | struct scatterlist *sg; |
7ba24713 AA |
672 | int i, offset, rc = 0; |
673 | ||
674 | BUG_ON((void*)ctask != sc->SCp.ptr); | |
675 | ||
676 | /* | |
677 | * copying Data-In into the Scsi_Cmnd | |
678 | */ | |
679 | if (!sc->use_sg) { | |
680 | i = ctask->data_count; | |
5bb0b55a MC |
681 | rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, |
682 | sc->request_bufflen, | |
683 | tcp_ctask->data_offset); | |
7ba24713 AA |
684 | if (rc == -EAGAIN) |
685 | return rc; | |
42f72aa9 | 686 | if (conn->datadgst_en) |
5bb0b55a MC |
687 | iscsi_recv_digest_update(tcp_conn, sc->request_buffer, |
688 | i); | |
7ba24713 AA |
689 | rc = 0; |
690 | goto done; | |
691 | } | |
692 | ||
5bb0b55a | 693 | offset = tcp_ctask->data_offset; |
7ba24713 AA |
694 | sg = sc->request_buffer; |
695 | ||
5bb0b55a MC |
696 | if (tcp_ctask->data_offset) |
697 | for (i = 0; i < tcp_ctask->sg_count; i++) | |
7ba24713 AA |
698 | offset -= sg[i].length; |
699 | /* we've passed through partial sg*/ | |
700 | if (offset < 0) | |
701 | offset = 0; | |
702 | ||
5bb0b55a | 703 | for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { |
7ba24713 AA |
704 | char *dest; |
705 | ||
706 | dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); | |
5bb0b55a | 707 | rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, |
7ba24713 AA |
708 | sg[i].length, offset); |
709 | kunmap_atomic(dest, KM_SOFTIRQ0); | |
710 | if (rc == -EAGAIN) | |
711 | /* continue with the next SKB/PDU */ | |
712 | return rc; | |
713 | if (!rc) { | |
714 | if (conn->datadgst_en) { | |
715 | if (!offset) | |
5bb0b55a MC |
716 | crypto_digest_update( |
717 | tcp_conn->data_rx_tfm, | |
718 | &sg[i], 1); | |
7ba24713 | 719 | else |
5bb0b55a MC |
720 | partial_sg_digest_update(tcp_conn, |
721 | &sg[i], | |
7ba24713 AA |
722 | sg[i].offset + offset, |
723 | sg[i].length - offset); | |
724 | } | |
725 | offset = 0; | |
5bb0b55a | 726 | tcp_ctask->sg_count++; |
7ba24713 AA |
727 | } |
728 | ||
729 | if (!ctask->data_count) { | |
730 | if (rc && conn->datadgst_en) | |
731 | /* | |
732 | * data-in is complete, but buffer not... | |
733 | */ | |
5bb0b55a | 734 | partial_sg_digest_update(tcp_conn, &sg[i], |
7ba24713 AA |
735 | sg[i].offset, sg[i].length-rc); |
736 | rc = 0; | |
737 | break; | |
738 | } | |
739 | ||
5bb0b55a | 740 | if (!tcp_conn->in.copy) |
7ba24713 AA |
741 | return -EAGAIN; |
742 | } | |
743 | BUG_ON(ctask->data_count); | |
744 | ||
745 | done: | |
746 | /* check for non-exceptional status */ | |
5bb0b55a | 747 | if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { |
7ba24713 AA |
748 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", |
749 | (long)sc, sc->result, ctask->itt); | |
5bb0b55a MC |
750 | spin_lock(&conn->session->lock); |
751 | __iscsi_ctask_cleanup(conn, ctask); | |
752 | __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); | |
753 | spin_unlock(&conn->session->lock); | |
7ba24713 AA |
754 | } |
755 | ||
756 | return rc; | |
757 | } | |
758 | ||
759 | static int | |
760 | iscsi_data_recv(struct iscsi_conn *conn) | |
761 | { | |
5bb0b55a MC |
762 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
763 | int rc = 0, opcode; | |
7ba24713 | 764 | |
5bb0b55a MC |
765 | opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
766 | switch (opcode) { | |
7ba24713 AA |
767 | case ISCSI_OP_SCSI_DATA_IN: |
768 | rc = iscsi_scsi_data_in(conn); | |
769 | break; | |
5bb0b55a MC |
770 | case ISCSI_OP_SCSI_CMD_RSP: |
771 | spin_lock(&conn->session->lock); | |
772 | __iscsi_ctask_cleanup(conn, tcp_conn->in.ctask); | |
773 | spin_unlock(&conn->session->lock); | |
7ba24713 AA |
774 | case ISCSI_OP_TEXT_RSP: |
775 | case ISCSI_OP_LOGIN_RSP: | |
5bb0b55a MC |
776 | case ISCSI_OP_NOOP_IN: |
777 | case ISCSI_OP_ASYNC_EVENT: | |
778 | case ISCSI_OP_REJECT: | |
7ba24713 AA |
779 | /* |
780 | * Collect data segment to the connection's data | |
781 | * placeholder | |
782 | */ | |
5bb0b55a | 783 | if (iscsi_tcp_copy(tcp_conn)) { |
7ba24713 AA |
784 | rc = -EAGAIN; |
785 | goto exit; | |
786 | } | |
787 | ||
5bb0b55a MC |
788 | rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, tcp_conn->data, |
789 | tcp_conn->in.datalen); | |
790 | if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) | |
791 | iscsi_recv_digest_update(tcp_conn, tcp_conn->data, | |
792 | tcp_conn->in.datalen); | |
793 | break; | |
7ba24713 AA |
794 | default: |
795 | BUG_ON(1); | |
796 | } | |
797 | exit: | |
798 | return rc; | |
799 | } | |
800 | ||
801 | /** | |
802 | * iscsi_tcp_data_recv - TCP receive in sendfile fashion | |
803 | * @rd_desc: read descriptor | |
804 | * @skb: socket buffer | |
805 | * @offset: offset in skb | |
806 | * @len: skb->len - offset | |
807 | **/ | |
808 | static int | |
809 | iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
810 | unsigned int offset, size_t len) | |
811 | { | |
812 | int rc; | |
813 | struct iscsi_conn *conn = rd_desc->arg.data; | |
5bb0b55a | 814 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
815 | int processed; |
816 | char pad[ISCSI_PAD_LEN]; | |
817 | struct scatterlist sg; | |
818 | ||
819 | /* | |
820 | * Save current SKB and its offset in the corresponding | |
821 | * connection context. | |
822 | */ | |
5bb0b55a MC |
823 | tcp_conn->in.copy = skb->len - offset; |
824 | tcp_conn->in.offset = offset; | |
825 | tcp_conn->in.skb = skb; | |
826 | tcp_conn->in.len = tcp_conn->in.copy; | |
827 | BUG_ON(tcp_conn->in.copy <= 0); | |
828 | debug_tcp("in %d bytes\n", tcp_conn->in.copy); | |
7ba24713 AA |
829 | |
830 | more: | |
5bb0b55a | 831 | tcp_conn->in.copied = 0; |
7ba24713 AA |
832 | rc = 0; |
833 | ||
834 | if (unlikely(conn->suspend_rx)) { | |
835 | debug_tcp("conn %d Rx suspended!\n", conn->id); | |
836 | return 0; | |
837 | } | |
838 | ||
5bb0b55a MC |
839 | if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || |
840 | tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { | |
841 | rc = iscsi_hdr_extract(tcp_conn); | |
7ba24713 AA |
842 | if (rc) { |
843 | if (rc == -EAGAIN) | |
844 | goto nomore; | |
845 | else { | |
846 | iscsi_conn_failure(conn, rc); | |
847 | return 0; | |
848 | } | |
849 | } | |
850 | ||
851 | /* | |
852 | * Verify and process incoming PDU header. | |
853 | */ | |
5bb0b55a MC |
854 | rc = iscsi_tcp_hdr_recv(conn); |
855 | if (!rc && tcp_conn->in.datalen) { | |
8a47cd34 | 856 | if (conn->datadgst_en) { |
5bb0b55a MC |
857 | BUG_ON(!tcp_conn->data_rx_tfm); |
858 | crypto_digest_init(tcp_conn->data_rx_tfm); | |
7ba24713 | 859 | } |
5bb0b55a | 860 | tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; |
7ba24713 AA |
861 | } else if (rc) { |
862 | iscsi_conn_failure(conn, rc); | |
863 | return 0; | |
864 | } | |
865 | } | |
866 | ||
5bb0b55a | 867 | if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { |
f6cfba1d | 868 | uint32_t recv_digest; |
5bb0b55a | 869 | |
7ba24713 | 870 | debug_tcp("extra data_recv offset %d copy %d\n", |
5bb0b55a MC |
871 | tcp_conn->in.offset, tcp_conn->in.copy); |
872 | skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, | |
f6cfba1d | 873 | &recv_digest, 4); |
5bb0b55a MC |
874 | tcp_conn->in.offset += 4; |
875 | tcp_conn->in.copy -= 4; | |
876 | if (recv_digest != tcp_conn->in.datadgst) { | |
f6cfba1d MC |
877 | debug_tcp("iscsi_tcp: data digest error!" |
878 | "0x%x != 0x%x\n", recv_digest, | |
5bb0b55a | 879 | tcp_conn->in.datadgst); |
f6cfba1d MC |
880 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
881 | return 0; | |
882 | } else { | |
883 | debug_tcp("iscsi_tcp: data digest match!" | |
884 | "0x%x == 0x%x\n", recv_digest, | |
5bb0b55a MC |
885 | tcp_conn->in.datadgst); |
886 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 AA |
887 | } |
888 | } | |
889 | ||
5bb0b55a MC |
890 | if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && |
891 | tcp_conn->in.copy) { | |
7ba24713 AA |
892 | |
893 | debug_tcp("data_recv offset %d copy %d\n", | |
5bb0b55a | 894 | tcp_conn->in.offset, tcp_conn->in.copy); |
7ba24713 AA |
895 | |
896 | rc = iscsi_data_recv(conn); | |
897 | if (rc) { | |
665b44ae | 898 | if (rc == -EAGAIN) |
7ba24713 | 899 | goto again; |
7ba24713 AA |
900 | iscsi_conn_failure(conn, rc); |
901 | return 0; | |
902 | } | |
5bb0b55a MC |
903 | tcp_conn->in.copy -= tcp_conn->in.padding; |
904 | tcp_conn->in.offset += tcp_conn->in.padding; | |
8a47cd34 | 905 | if (conn->datadgst_en) { |
5bb0b55a MC |
906 | if (tcp_conn->in.padding) { |
907 | debug_tcp("padding -> %d\n", | |
908 | tcp_conn->in.padding); | |
909 | memset(pad, 0, tcp_conn->in.padding); | |
910 | sg_init_one(&sg, pad, tcp_conn->in.padding); | |
911 | crypto_digest_update(tcp_conn->data_rx_tfm, | |
912 | &sg, 1); | |
7ba24713 | 913 | } |
5bb0b55a MC |
914 | crypto_digest_final(tcp_conn->data_rx_tfm, |
915 | (u8 *) & tcp_conn->in.datadgst); | |
916 | debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); | |
917 | tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; | |
7ba24713 | 918 | } else |
5bb0b55a | 919 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; |
7ba24713 AA |
920 | } |
921 | ||
922 | debug_tcp("f, processed %d from out of %d padding %d\n", | |
5bb0b55a MC |
923 | tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); |
924 | BUG_ON(tcp_conn->in.offset - offset > len); | |
7ba24713 | 925 | |
5bb0b55a | 926 | if (tcp_conn->in.offset - offset != len) { |
7ba24713 | 927 | debug_tcp("continue to process %d bytes\n", |
5bb0b55a | 928 | (int)len - (tcp_conn->in.offset - offset)); |
7ba24713 AA |
929 | goto more; |
930 | } | |
931 | ||
932 | nomore: | |
5bb0b55a | 933 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
934 | BUG_ON(processed == 0); |
935 | return processed; | |
936 | ||
937 | again: | |
5bb0b55a | 938 | processed = tcp_conn->in.offset - offset; |
7ba24713 AA |
939 | debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", |
940 | processed, (int)len, (int)rd_desc->count); | |
941 | BUG_ON(processed == 0); | |
942 | BUG_ON(processed > len); | |
943 | ||
944 | conn->rxdata_octets += processed; | |
945 | return processed; | |
946 | } | |
947 | ||
948 | static void | |
949 | iscsi_tcp_data_ready(struct sock *sk, int flag) | |
950 | { | |
951 | struct iscsi_conn *conn = sk->sk_user_data; | |
952 | read_descriptor_t rd_desc; | |
953 | ||
954 | read_lock(&sk->sk_callback_lock); | |
955 | ||
665b44ae MC |
956 | /* |
957 | * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv. | |
958 | * We set count to 1 because we want the network layer to | |
959 | * hand us all the skbs that are available. iscsi_tcp_data_recv | |
960 | * handled pdus that cross buffers or pdus that still need data. | |
961 | */ | |
7ba24713 | 962 | rd_desc.arg.data = conn; |
665b44ae | 963 | rd_desc.count = 1; |
7ba24713 AA |
964 | tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); |
965 | ||
966 | read_unlock(&sk->sk_callback_lock); | |
967 | } | |
968 | ||
969 | static void | |
970 | iscsi_tcp_state_change(struct sock *sk) | |
971 | { | |
5bb0b55a | 972 | struct iscsi_tcp_conn *tcp_conn; |
7ba24713 AA |
973 | struct iscsi_conn *conn; |
974 | struct iscsi_session *session; | |
975 | void (*old_state_change)(struct sock *); | |
976 | ||
977 | read_lock(&sk->sk_callback_lock); | |
978 | ||
979 | conn = (struct iscsi_conn*)sk->sk_user_data; | |
980 | session = conn->session; | |
981 | ||
e6273993 MC |
982 | if ((sk->sk_state == TCP_CLOSE_WAIT || |
983 | sk->sk_state == TCP_CLOSE) && | |
984 | !atomic_read(&sk->sk_rmem_alloc)) { | |
7ba24713 AA |
985 | debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
986 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
987 | } | |
988 | ||
5bb0b55a MC |
989 | tcp_conn = conn->dd_data; |
990 | old_state_change = tcp_conn->old_state_change; | |
7ba24713 AA |
991 | |
992 | read_unlock(&sk->sk_callback_lock); | |
993 | ||
994 | old_state_change(sk); | |
995 | } | |
996 | ||
997 | /** | |
998 | * iscsi_write_space - Called when more output buffer space is available | |
999 | * @sk: socket space is available for | |
1000 | **/ | |
1001 | static void | |
1002 | iscsi_write_space(struct sock *sk) | |
1003 | { | |
1004 | struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; | |
5bb0b55a MC |
1005 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1006 | ||
1007 | tcp_conn->old_write_space(sk); | |
7ba24713 | 1008 | debug_tcp("iscsi_write_space: cid %d\n", conn->id); |
55e3299d | 1009 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
7ba24713 AA |
1010 | } |
1011 | ||
1012 | static void | |
1013 | iscsi_conn_set_callbacks(struct iscsi_conn *conn) | |
1014 | { | |
5bb0b55a MC |
1015 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1016 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1017 | |
1018 | /* assign new callbacks */ | |
1019 | write_lock_bh(&sk->sk_callback_lock); | |
1020 | sk->sk_user_data = conn; | |
5bb0b55a MC |
1021 | tcp_conn->old_data_ready = sk->sk_data_ready; |
1022 | tcp_conn->old_state_change = sk->sk_state_change; | |
1023 | tcp_conn->old_write_space = sk->sk_write_space; | |
7ba24713 AA |
1024 | sk->sk_data_ready = iscsi_tcp_data_ready; |
1025 | sk->sk_state_change = iscsi_tcp_state_change; | |
1026 | sk->sk_write_space = iscsi_write_space; | |
1027 | write_unlock_bh(&sk->sk_callback_lock); | |
1028 | } | |
1029 | ||
1030 | static void | |
1031 | iscsi_conn_restore_callbacks(struct iscsi_conn *conn) | |
1032 | { | |
5bb0b55a MC |
1033 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1034 | struct sock *sk = tcp_conn->sock->sk; | |
7ba24713 AA |
1035 | |
1036 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
1037 | write_lock_bh(&sk->sk_callback_lock); | |
1038 | sk->sk_user_data = NULL; | |
5bb0b55a MC |
1039 | sk->sk_data_ready = tcp_conn->old_data_ready; |
1040 | sk->sk_state_change = tcp_conn->old_state_change; | |
1041 | sk->sk_write_space = tcp_conn->old_write_space; | |
7ba24713 AA |
1042 | sk->sk_no_check = 0; |
1043 | write_unlock_bh(&sk->sk_callback_lock); | |
1044 | } | |
1045 | ||
1046 | /** | |
1047 | * iscsi_send - generic send routine | |
1048 | * @sk: kernel's socket | |
1049 | * @buf: buffer to write from | |
1050 | * @size: actual size to write | |
1051 | * @flags: socket's flags | |
7ba24713 AA |
1052 | */ |
1053 | static inline int | |
56851698 | 1054 | iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) |
7ba24713 | 1055 | { |
5bb0b55a MC |
1056 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1057 | struct socket *sk = tcp_conn->sock; | |
3219e529 | 1058 | int offset = buf->sg.offset + buf->sent, res; |
7ba24713 | 1059 | |
7cae5159 MC |
1060 | /* |
1061 | * if we got use_sg=0 or are sending something we kmallocd | |
1062 | * then we did not have to do kmap (kmap returns page_address) | |
1063 | * | |
1064 | * if we got use_sg > 0, but had to drop down, we do not | |
1065 | * set clustering so this should only happen for that | |
1066 | * slab case. | |
1067 | */ | |
1068 | if (buf->use_sendmsg) | |
3219e529 | 1069 | res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags); |
7cae5159 | 1070 | else |
3219e529 MC |
1071 | res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags); |
1072 | ||
1073 | if (res >= 0) { | |
1074 | conn->txdata_octets += res; | |
1075 | buf->sent += res; | |
1076 | return res; | |
1077 | } | |
1078 | ||
1079 | tcp_conn->sendpage_failures_cnt++; | |
1080 | if (res == -EAGAIN) | |
1081 | res = -ENOBUFS; | |
1082 | else | |
1083 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1084 | return res; | |
7ba24713 AA |
1085 | } |
1086 | ||
1087 | /** | |
1088 | * iscsi_sendhdr - send PDU Header via tcp_sendpage() | |
1089 | * @conn: iscsi connection | |
1090 | * @buf: buffer to write from | |
1091 | * @datalen: lenght of data to be sent after the header | |
1092 | * | |
1093 | * Notes: | |
1094 | * (Tx, Fast Path) | |
1095 | **/ | |
1096 | static inline int | |
1097 | iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) | |
1098 | { | |
7ba24713 AA |
1099 | int flags = 0; /* MSG_DONTWAIT; */ |
1100 | int res, size; | |
1101 | ||
1102 | size = buf->sg.length - buf->sent; | |
1103 | BUG_ON(buf->sent + size > buf->sg.length); | |
1104 | if (buf->sent + size != buf->sg.length || datalen) | |
1105 | flags |= MSG_MORE; | |
1106 | ||
56851698 | 1107 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1108 | debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); |
1109 | if (res >= 0) { | |
7ba24713 AA |
1110 | if (size != res) |
1111 | return -EAGAIN; | |
1112 | return 0; | |
3219e529 | 1113 | } |
7ba24713 AA |
1114 | |
1115 | return res; | |
1116 | } | |
1117 | ||
1118 | /** | |
1119 | * iscsi_sendpage - send one page of iSCSI Data-Out. | |
1120 | * @conn: iscsi connection | |
1121 | * @buf: buffer to write from | |
1122 | * @count: remaining data | |
1123 | * @sent: number of bytes sent | |
1124 | * | |
1125 | * Notes: | |
1126 | * (Tx, Fast Path) | |
1127 | **/ | |
1128 | static inline int | |
1129 | iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, | |
1130 | int *count, int *sent) | |
1131 | { | |
7ba24713 AA |
1132 | int flags = 0; /* MSG_DONTWAIT; */ |
1133 | int res, size; | |
1134 | ||
1135 | size = buf->sg.length - buf->sent; | |
1136 | BUG_ON(buf->sent + size > buf->sg.length); | |
1137 | if (size > *count) | |
1138 | size = *count; | |
b13941f6 | 1139 | if (buf->sent + size != buf->sg.length || *count != size) |
7ba24713 AA |
1140 | flags |= MSG_MORE; |
1141 | ||
56851698 | 1142 | res = iscsi_send(conn, buf, size, flags); |
7ba24713 AA |
1143 | debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", |
1144 | size, buf->sent, *count, *sent, res); | |
1145 | if (res >= 0) { | |
7ba24713 AA |
1146 | *count -= res; |
1147 | *sent += res; | |
1148 | if (size != res) | |
1149 | return -EAGAIN; | |
1150 | return 0; | |
3219e529 | 1151 | } |
7ba24713 AA |
1152 | |
1153 | return res; | |
1154 | } | |
1155 | ||
1156 | static inline void | |
5bb0b55a MC |
1157 | iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, |
1158 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1159 | { |
5bb0b55a MC |
1160 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1161 | ||
1162 | BUG_ON(!tcp_conn->data_tx_tfm); | |
1163 | crypto_digest_init(tcp_conn->data_tx_tfm); | |
1164 | tcp_ctask->digest_count = 4; | |
7ba24713 AA |
1165 | } |
1166 | ||
858119e1 | 1167 | static int |
7ba24713 AA |
1168 | iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
1169 | struct iscsi_buf *buf, uint32_t *digest, int final) | |
1170 | { | |
5bb0b55a MC |
1171 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1172 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
7ba24713 AA |
1173 | int rc = 0; |
1174 | int sent = 0; | |
1175 | ||
1176 | if (final) | |
5bb0b55a | 1177 | crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest); |
7ba24713 | 1178 | |
6e458cc9 | 1179 | iscsi_buf_init_iov(buf, (char*)digest, 4); |
5bb0b55a | 1180 | rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); |
7ba24713 | 1181 | if (rc) { |
5bb0b55a MC |
1182 | tcp_ctask->datadigest = *digest; |
1183 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; | |
7ba24713 | 1184 | } else |
5bb0b55a | 1185 | tcp_ctask->digest_count = 4; |
7ba24713 AA |
1186 | return rc; |
1187 | } | |
1188 | ||
1189 | /** | |
1190 | * iscsi_solicit_data_cont - initialize next Data-Out | |
1191 | * @conn: iscsi connection | |
1192 | * @ctask: scsi command task | |
1193 | * @r2t: R2T info | |
1194 | * @left: bytes left to transfer | |
1195 | * | |
1196 | * Notes: | |
1197 | * Initialize next Data-Out within this R2T sequence and continue | |
1198 | * to process next Scatter-Gather element(if any) of this SCSI command. | |
1199 | * | |
1200 | * Called under connection lock. | |
1201 | **/ | |
1202 | static void | |
1203 | iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1204 | struct iscsi_r2t_info *r2t, int left) | |
1205 | { | |
5bb0b55a | 1206 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1207 | struct iscsi_data *hdr; |
7ba24713 AA |
1208 | struct scsi_cmnd *sc = ctask->sc; |
1209 | int new_offset; | |
1210 | ||
ffbfe925 | 1211 | hdr = &r2t->dtask.hdr; |
7ba24713 AA |
1212 | memset(hdr, 0, sizeof(struct iscsi_data)); |
1213 | hdr->ttt = r2t->ttt; | |
1214 | hdr->datasn = cpu_to_be32(r2t->solicit_datasn); | |
1215 | r2t->solicit_datasn++; | |
1216 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
5bb0b55a MC |
1217 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
1218 | hdr->itt = ctask->hdr->itt; | |
7ba24713 AA |
1219 | hdr->exp_statsn = r2t->exp_statsn; |
1220 | new_offset = r2t->data_offset + r2t->sent; | |
1221 | hdr->offset = cpu_to_be32(new_offset); | |
1222 | if (left > conn->max_xmit_dlength) { | |
1223 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
1224 | r2t->data_count = conn->max_xmit_dlength; | |
1225 | } else { | |
1226 | hton24(hdr->dlength, left); | |
1227 | r2t->data_count = left; | |
1228 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
1229 | } | |
1230 | conn->dataout_pdus_cnt++; | |
1231 | ||
6e458cc9 | 1232 | iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, |
af973481 | 1233 | sizeof(struct iscsi_hdr)); |
7ba24713 | 1234 | |
7ba24713 | 1235 | if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { |
5bb0b55a | 1236 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
7ba24713 AA |
1237 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1238 | r2t->sg += 1; | |
1239 | } else | |
5bb0b55a | 1240 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, |
7ba24713 AA |
1241 | (char*)sc->request_buffer + new_offset, |
1242 | r2t->data_count); | |
7ba24713 AA |
1243 | } |
1244 | ||
1245 | static void | |
1246 | iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1247 | { | |
5bb0b55a | 1248 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1249 | struct iscsi_data_task *dtask; |
1250 | ||
ffbfe925 | 1251 | dtask = tcp_ctask->dtask = &tcp_ctask->unsol_dtask; |
5bb0b55a MC |
1252 | iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr, |
1253 | tcp_ctask->r2t_data_count); | |
6e458cc9 | 1254 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, |
af973481 | 1255 | sizeof(struct iscsi_hdr)); |
7ba24713 AA |
1256 | } |
1257 | ||
1258 | /** | |
5bb0b55a | 1259 | * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands |
7ba24713 AA |
1260 | * @conn: iscsi connection |
1261 | * @ctask: scsi command task | |
1262 | * @sc: scsi command | |
1263 | **/ | |
1264 | static void | |
5bb0b55a | 1265 | iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) |
7ba24713 | 1266 | { |
5bb0b55a MC |
1267 | struct scsi_cmnd *sc = ctask->sc; |
1268 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 1269 | |
5bb0b55a | 1270 | BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); |
7ba24713 | 1271 | |
5bb0b55a MC |
1272 | tcp_ctask->sent = 0; |
1273 | tcp_ctask->sg_count = 0; | |
7ba24713 AA |
1274 | |
1275 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
5bb0b55a MC |
1276 | tcp_ctask->xmstate = XMSTATE_W_HDR; |
1277 | tcp_ctask->exp_r2tsn = 0; | |
7ba24713 | 1278 | BUG_ON(ctask->total_length == 0); |
5bb0b55a | 1279 | |
7ba24713 AA |
1280 | if (sc->use_sg) { |
1281 | struct scatterlist *sg = sc->request_buffer; | |
1282 | ||
5bb0b55a MC |
1283 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1284 | &sg[tcp_ctask->sg_count++]); | |
1285 | tcp_ctask->sg = sg; | |
1286 | tcp_ctask->bad_sg = sg + sc->use_sg; | |
1287 | } else | |
1288 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, | |
1289 | sc->request_buffer, | |
1290 | sc->request_bufflen); | |
7ba24713 | 1291 | |
5bb0b55a MC |
1292 | if (ctask->imm_count) |
1293 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; | |
1294 | ||
1295 | tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); | |
1296 | if (tcp_ctask->pad_count) { | |
1297 | tcp_ctask->pad_count = ISCSI_PAD_LEN - | |
1298 | tcp_ctask->pad_count; | |
7ba24713 | 1299 | debug_scsi("write padding %d bytes\n", |
5bb0b55a MC |
1300 | tcp_ctask->pad_count); |
1301 | tcp_ctask->xmstate |= XMSTATE_W_PAD; | |
7ba24713 | 1302 | } |
7ba24713 | 1303 | |
5bb0b55a MC |
1304 | if (ctask->unsol_count) |
1305 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR | | |
1306 | XMSTATE_UNS_INIT; | |
1307 | tcp_ctask->r2t_data_count = ctask->total_length - | |
7ba24713 AA |
1308 | ctask->imm_count - |
1309 | ctask->unsol_count; | |
1310 | ||
1311 | debug_scsi("cmd [itt %x total %d imm %d imm_data %d " | |
1312 | "r2t_data %d]\n", | |
1313 | ctask->itt, ctask->total_length, ctask->imm_count, | |
5bb0b55a MC |
1314 | ctask->unsol_count, tcp_ctask->r2t_data_count); |
1315 | } else | |
1316 | tcp_ctask->xmstate = XMSTATE_R_HDR; | |
7ba24713 | 1317 | |
6e458cc9 | 1318 | iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, |
af973481 | 1319 | sizeof(struct iscsi_hdr)); |
7ba24713 AA |
1320 | } |
1321 | ||
1322 | /** | |
5bb0b55a | 1323 | * iscsi_tcp_mtask_xmit - xmit management(immediate) task |
7ba24713 AA |
1324 | * @conn: iscsi connection |
1325 | * @mtask: task management task | |
1326 | * | |
1327 | * Notes: | |
1328 | * The function can return -EAGAIN in which case caller must | |
1329 | * call it again later, or recover. '0' return code means successful | |
1330 | * xmit. | |
1331 | * | |
1332 | * Management xmit state machine consists of two states: | |
1333 | * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress | |
1334 | * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress | |
1335 | **/ | |
1336 | static int | |
5bb0b55a | 1337 | iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) |
7ba24713 | 1338 | { |
5bb0b55a | 1339 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
3219e529 | 1340 | int rc; |
7ba24713 AA |
1341 | |
1342 | debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", | |
5bb0b55a | 1343 | conn->id, tcp_mtask->xmstate, mtask->itt); |
7ba24713 | 1344 | |
5bb0b55a MC |
1345 | if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { |
1346 | tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; | |
7ba24713 | 1347 | if (mtask->data_count) |
5bb0b55a | 1348 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
af973481 | 1349 | if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && |
30a6c652 | 1350 | conn->stop_stage != STOP_CONN_RECOVER && |
af973481 | 1351 | conn->hdrdgst_en) |
5bb0b55a MC |
1352 | iscsi_hdr_digest(conn, &tcp_mtask->headbuf, |
1353 | (u8*)tcp_mtask->hdrext); | |
3219e529 MC |
1354 | rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf, |
1355 | mtask->data_count); | |
1356 | if (rc) { | |
5bb0b55a | 1357 | tcp_mtask->xmstate |= XMSTATE_IMM_HDR; |
7ba24713 | 1358 | if (mtask->data_count) |
5bb0b55a | 1359 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
3219e529 | 1360 | return rc; |
7ba24713 AA |
1361 | } |
1362 | } | |
1363 | ||
5bb0b55a | 1364 | if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 | 1365 | BUG_ON(!mtask->data_count); |
5bb0b55a | 1366 | tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1367 | /* FIXME: implement. |
1368 | * Virtual buffer could be spreaded across multiple pages... | |
1369 | */ | |
1370 | do { | |
3219e529 MC |
1371 | int rc; |
1372 | ||
1373 | rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf, | |
1374 | &mtask->data_count, &tcp_mtask->sent); | |
1375 | if (rc) { | |
5bb0b55a | 1376 | tcp_mtask->xmstate |= XMSTATE_IMM_DATA; |
3219e529 | 1377 | return rc; |
7ba24713 AA |
1378 | } |
1379 | } while (mtask->data_count); | |
1380 | } | |
1381 | ||
5bb0b55a MC |
1382 | BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); |
1383 | if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
1384 | struct iscsi_session *session = conn->session; | |
1385 | ||
1386 | spin_lock_bh(&session->lock); | |
1387 | list_del(&conn->mtask->running); | |
1388 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, | |
1389 | sizeof(void*)); | |
1390 | spin_unlock_bh(&session->lock); | |
1391 | } | |
7ba24713 AA |
1392 | return 0; |
1393 | } | |
1394 | ||
1395 | static inline int | |
5bb0b55a MC |
1396 | handle_xmstate_r_hdr(struct iscsi_conn *conn, |
1397 | struct iscsi_tcp_cmd_task *tcp_ctask) | |
7ba24713 | 1398 | { |
3219e529 MC |
1399 | int rc; |
1400 | ||
5bb0b55a | 1401 | tcp_ctask->xmstate &= ~XMSTATE_R_HDR; |
42f72aa9 | 1402 | if (conn->hdrdgst_en) |
5bb0b55a MC |
1403 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
1404 | (u8*)tcp_ctask->hdrext); | |
3219e529 MC |
1405 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0); |
1406 | if (!rc) { | |
5bb0b55a | 1407 | BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE); |
7ba24713 AA |
1408 | return 0; /* wait for Data-In */ |
1409 | } | |
5bb0b55a | 1410 | tcp_ctask->xmstate |= XMSTATE_R_HDR; |
3219e529 | 1411 | return rc; |
7ba24713 AA |
1412 | } |
1413 | ||
1414 | static inline int | |
5bb0b55a MC |
1415 | handle_xmstate_w_hdr(struct iscsi_conn *conn, |
1416 | struct iscsi_cmd_task *ctask) | |
7ba24713 | 1417 | { |
5bb0b55a | 1418 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1419 | int rc; |
5bb0b55a MC |
1420 | |
1421 | tcp_ctask->xmstate &= ~XMSTATE_W_HDR; | |
42f72aa9 | 1422 | if (conn->hdrdgst_en) |
5bb0b55a MC |
1423 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
1424 | (u8*)tcp_ctask->hdrext); | |
3219e529 MC |
1425 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count); |
1426 | if (rc) | |
5bb0b55a | 1427 | tcp_ctask->xmstate |= XMSTATE_W_HDR; |
3219e529 | 1428 | return rc; |
7ba24713 AA |
1429 | } |
1430 | ||
1431 | static inline int | |
1432 | handle_xmstate_data_digest(struct iscsi_conn *conn, | |
1433 | struct iscsi_cmd_task *ctask) | |
1434 | { | |
5bb0b55a | 1435 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
3219e529 | 1436 | int rc; |
5bb0b55a MC |
1437 | |
1438 | tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST; | |
1439 | debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest); | |
3219e529 MC |
1440 | rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, |
1441 | &tcp_ctask->datadigest, 0); | |
1442 | if (rc) { | |
5bb0b55a | 1443 | tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; |
7ba24713 | 1444 | debug_tcp("resent data digest 0x%x fail!\n", |
5bb0b55a | 1445 | tcp_ctask->datadigest); |
7ba24713 | 1446 | } |
3219e529 MC |
1447 | |
1448 | return rc; | |
7ba24713 AA |
1449 | } |
1450 | ||
1451 | static inline int | |
1452 | handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1453 | { | |
5bb0b55a MC |
1454 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1455 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
3219e529 | 1456 | int rc; |
5bb0b55a | 1457 | |
7ba24713 | 1458 | BUG_ON(!ctask->imm_count); |
5bb0b55a | 1459 | tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; |
7ba24713 AA |
1460 | |
1461 | if (conn->datadgst_en) { | |
5bb0b55a MC |
1462 | iscsi_data_digest_init(tcp_conn, ctask); |
1463 | tcp_ctask->immdigest = 0; | |
7ba24713 AA |
1464 | } |
1465 | ||
1466 | for (;;) { | |
3219e529 MC |
1467 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
1468 | &ctask->imm_count, &tcp_ctask->sent); | |
1469 | if (rc) { | |
5bb0b55a | 1470 | tcp_ctask->xmstate |= XMSTATE_IMM_DATA; |
7ba24713 | 1471 | if (conn->datadgst_en) { |
5bb0b55a MC |
1472 | crypto_digest_final(tcp_conn->data_tx_tfm, |
1473 | (u8*)&tcp_ctask->immdigest); | |
7ba24713 | 1474 | debug_tcp("tx imm sendpage fail 0x%x\n", |
5bb0b55a | 1475 | tcp_ctask->datadigest); |
7ba24713 | 1476 | } |
3219e529 | 1477 | return rc; |
7ba24713 AA |
1478 | } |
1479 | if (conn->datadgst_en) | |
5bb0b55a MC |
1480 | crypto_digest_update(tcp_conn->data_tx_tfm, |
1481 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1482 | |
1483 | if (!ctask->imm_count) | |
1484 | break; | |
5bb0b55a MC |
1485 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1486 | &tcp_ctask->sg[tcp_ctask->sg_count++]); | |
7ba24713 AA |
1487 | } |
1488 | ||
5bb0b55a | 1489 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
3219e529 MC |
1490 | rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, |
1491 | &tcp_ctask->immdigest, 1); | |
1492 | if (rc) { | |
7ba24713 | 1493 | debug_tcp("sending imm digest 0x%x fail!\n", |
5bb0b55a | 1494 | tcp_ctask->immdigest); |
3219e529 | 1495 | return rc; |
7ba24713 | 1496 | } |
5bb0b55a | 1497 | debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest); |
7ba24713 AA |
1498 | } |
1499 | ||
1500 | return 0; | |
1501 | } | |
1502 | ||
1503 | static inline int | |
1504 | handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1505 | { | |
5bb0b55a | 1506 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 | 1507 | struct iscsi_data_task *dtask; |
3219e529 | 1508 | int rc; |
7ba24713 | 1509 | |
5bb0b55a MC |
1510 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; |
1511 | if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { | |
7ba24713 | 1512 | iscsi_unsolicit_data_init(conn, ctask); |
5bb0b55a | 1513 | dtask = tcp_ctask->dtask; |
af973481 | 1514 | if (conn->hdrdgst_en) |
5bb0b55a | 1515 | iscsi_hdr_digest(conn, &tcp_ctask->headbuf, |
af973481 | 1516 | (u8*)dtask->hdrext); |
5bb0b55a | 1517 | tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; |
7ba24713 | 1518 | } |
3219e529 MC |
1519 | |
1520 | rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count); | |
1521 | if (rc) { | |
5bb0b55a MC |
1522 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
1523 | tcp_ctask->xmstate |= XMSTATE_UNS_HDR; | |
3219e529 | 1524 | return rc; |
7ba24713 AA |
1525 | } |
1526 | ||
1527 | debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", | |
5bb0b55a | 1528 | ctask->itt, ctask->unsol_count, tcp_ctask->sent); |
7ba24713 AA |
1529 | return 0; |
1530 | } | |
1531 | ||
1532 | static inline int | |
1533 | handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1534 | { | |
5bb0b55a MC |
1535 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1536 | struct iscsi_data_task *dtask = tcp_ctask->dtask; | |
1537 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
3219e529 | 1538 | int rc; |
7ba24713 AA |
1539 | |
1540 | BUG_ON(!ctask->data_count); | |
5bb0b55a | 1541 | tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; |
7ba24713 AA |
1542 | |
1543 | if (conn->datadgst_en) { | |
5bb0b55a | 1544 | iscsi_data_digest_init(tcp_conn, ctask); |
7ba24713 AA |
1545 | dtask->digest = 0; |
1546 | } | |
1547 | ||
1548 | for (;;) { | |
5bb0b55a | 1549 | int start = tcp_ctask->sent; |
7ba24713 | 1550 | |
3219e529 MC |
1551 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, |
1552 | &ctask->data_count, &tcp_ctask->sent); | |
1553 | if (rc) { | |
5bb0b55a MC |
1554 | ctask->unsol_count -= tcp_ctask->sent - start; |
1555 | tcp_ctask->xmstate |= XMSTATE_UNS_DATA; | |
7ba24713 AA |
1556 | /* will continue with this ctask later.. */ |
1557 | if (conn->datadgst_en) { | |
5bb0b55a | 1558 | crypto_digest_final(tcp_conn->data_tx_tfm, |
7ba24713 AA |
1559 | (u8 *)&dtask->digest); |
1560 | debug_tcp("tx uns data fail 0x%x\n", | |
1561 | dtask->digest); | |
1562 | } | |
3219e529 | 1563 | return rc; |
7ba24713 AA |
1564 | } |
1565 | ||
5bb0b55a MC |
1566 | BUG_ON(tcp_ctask->sent > ctask->total_length); |
1567 | ctask->unsol_count -= tcp_ctask->sent - start; | |
7ba24713 AA |
1568 | |
1569 | /* | |
1570 | * XXX:we may run here with un-initial sendbuf. | |
1571 | * so pass it | |
1572 | */ | |
5bb0b55a MC |
1573 | if (conn->datadgst_en && tcp_ctask->sent - start > 0) |
1574 | crypto_digest_update(tcp_conn->data_tx_tfm, | |
1575 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1576 | |
1577 | if (!ctask->data_count) | |
1578 | break; | |
5bb0b55a MC |
1579 | iscsi_buf_init_sg(&tcp_ctask->sendbuf, |
1580 | &tcp_ctask->sg[tcp_ctask->sg_count++]); | |
7ba24713 AA |
1581 | } |
1582 | BUG_ON(ctask->unsol_count < 0); | |
1583 | ||
1584 | /* | |
1585 | * Done with the Data-Out. Next, check if we need | |
1586 | * to send another unsolicited Data-Out. | |
1587 | */ | |
1588 | if (ctask->unsol_count) { | |
1589 | if (conn->datadgst_en) { | |
3219e529 | 1590 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1591 | &dtask->digestbuf, |
3219e529 MC |
1592 | &dtask->digest, 1); |
1593 | if (rc) { | |
7ba24713 AA |
1594 | debug_tcp("send uns digest 0x%x fail\n", |
1595 | dtask->digest); | |
3219e529 | 1596 | return rc; |
7ba24713 AA |
1597 | } |
1598 | debug_tcp("sending uns digest 0x%x, more uns\n", | |
1599 | dtask->digest); | |
1600 | } | |
5bb0b55a | 1601 | tcp_ctask->xmstate |= XMSTATE_UNS_INIT; |
7ba24713 AA |
1602 | return 1; |
1603 | } | |
1604 | ||
5bb0b55a | 1605 | if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { |
3219e529 | 1606 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1607 | &dtask->digestbuf, |
3219e529 MC |
1608 | &dtask->digest, 1); |
1609 | if (rc) { | |
7ba24713 AA |
1610 | debug_tcp("send last uns digest 0x%x fail\n", |
1611 | dtask->digest); | |
3219e529 | 1612 | return rc; |
7ba24713 AA |
1613 | } |
1614 | debug_tcp("sending uns digest 0x%x\n",dtask->digest); | |
1615 | } | |
1616 | ||
1617 | return 0; | |
1618 | } | |
1619 | ||
1620 | static inline int | |
1621 | handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1622 | { | |
1623 | struct iscsi_session *session = conn->session; | |
5bb0b55a MC |
1624 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1625 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
1626 | struct iscsi_r2t_info *r2t = tcp_ctask->r2t; | |
ffbfe925 | 1627 | struct iscsi_data_task *dtask = &r2t->dtask; |
3219e529 | 1628 | int left, rc; |
7ba24713 | 1629 | |
5bb0b55a MC |
1630 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
1631 | tcp_ctask->dtask = dtask; | |
7ba24713 AA |
1632 | |
1633 | if (conn->datadgst_en) { | |
5bb0b55a | 1634 | iscsi_data_digest_init(tcp_conn, ctask); |
7ba24713 AA |
1635 | dtask->digest = 0; |
1636 | } | |
1637 | solicit_again: | |
1638 | /* | |
1639 | * send Data-Out whitnin this R2T sequence. | |
1640 | */ | |
1641 | if (!r2t->data_count) | |
1642 | goto data_out_done; | |
1643 | ||
3219e529 MC |
1644 | rc = iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent); |
1645 | if (rc) { | |
5bb0b55a | 1646 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
7ba24713 AA |
1647 | /* will continue with this ctask later.. */ |
1648 | if (conn->datadgst_en) { | |
5bb0b55a | 1649 | crypto_digest_final(tcp_conn->data_tx_tfm, |
7ba24713 AA |
1650 | (u8 *)&dtask->digest); |
1651 | debug_tcp("r2t data send fail 0x%x\n", dtask->digest); | |
1652 | } | |
3219e529 | 1653 | return rc; |
7ba24713 AA |
1654 | } |
1655 | ||
1656 | BUG_ON(r2t->data_count < 0); | |
1657 | if (conn->datadgst_en) | |
5bb0b55a MC |
1658 | crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg, |
1659 | 1); | |
7ba24713 AA |
1660 | |
1661 | if (r2t->data_count) { | |
1662 | BUG_ON(ctask->sc->use_sg == 0); | |
1663 | if (!iscsi_buf_left(&r2t->sendbuf)) { | |
5bb0b55a | 1664 | BUG_ON(tcp_ctask->bad_sg == r2t->sg); |
7ba24713 AA |
1665 | iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); |
1666 | r2t->sg += 1; | |
1667 | } | |
1668 | goto solicit_again; | |
1669 | } | |
1670 | ||
1671 | data_out_done: | |
1672 | /* | |
1673 | * Done with this Data-Out. Next, check if we have | |
1674 | * to send another Data-Out for this R2T. | |
1675 | */ | |
1676 | BUG_ON(r2t->data_length - r2t->sent < 0); | |
1677 | left = r2t->data_length - r2t->sent; | |
1678 | if (left) { | |
1679 | if (conn->datadgst_en) { | |
3219e529 | 1680 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1681 | &dtask->digestbuf, |
3219e529 MC |
1682 | &dtask->digest, 1); |
1683 | if (rc) { | |
7ba24713 AA |
1684 | debug_tcp("send r2t data digest 0x%x" |
1685 | "fail\n", dtask->digest); | |
3219e529 | 1686 | return rc; |
7ba24713 AA |
1687 | } |
1688 | debug_tcp("r2t data send digest 0x%x\n", | |
1689 | dtask->digest); | |
1690 | } | |
1691 | iscsi_solicit_data_cont(conn, ctask, r2t, left); | |
5bb0b55a MC |
1692 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; |
1693 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
7ba24713 AA |
1694 | return 1; |
1695 | } | |
1696 | ||
1697 | /* | |
1698 | * Done with this R2T. Check if there are more | |
1699 | * outstanding R2Ts ready to be processed. | |
1700 | */ | |
5bb0b55a | 1701 | BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0); |
7ba24713 | 1702 | if (conn->datadgst_en) { |
3219e529 MC |
1703 | rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, |
1704 | &dtask->digest, 1); | |
1705 | if (rc) { | |
7ba24713 AA |
1706 | debug_tcp("send last r2t data digest 0x%x" |
1707 | "fail\n", dtask->digest); | |
3219e529 | 1708 | return rc; |
7ba24713 AA |
1709 | } |
1710 | debug_tcp("r2t done dout digest 0x%x\n", dtask->digest); | |
1711 | } | |
1712 | ||
5bb0b55a MC |
1713 | tcp_ctask->r2t_data_count -= r2t->data_length; |
1714 | tcp_ctask->r2t = NULL; | |
7ba24713 | 1715 | spin_lock_bh(&session->lock); |
5bb0b55a | 1716 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); |
7ba24713 | 1717 | spin_unlock_bh(&session->lock); |
5bb0b55a MC |
1718 | if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { |
1719 | tcp_ctask->r2t = r2t; | |
1720 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
1721 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; | |
7ba24713 AA |
1722 | return 1; |
1723 | } | |
1724 | ||
1725 | return 0; | |
1726 | } | |
1727 | ||
1728 | static inline int | |
1729 | handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) | |
1730 | { | |
5bb0b55a MC |
1731 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
1732 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1733 | struct iscsi_data_task *dtask = tcp_ctask->dtask; | |
3219e529 | 1734 | int sent, rc; |
7ba24713 | 1735 | |
5bb0b55a | 1736 | tcp_ctask->xmstate &= ~XMSTATE_W_PAD; |
6e458cc9 | 1737 | iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, |
5bb0b55a | 1738 | tcp_ctask->pad_count); |
3219e529 MC |
1739 | rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, |
1740 | &sent); | |
1741 | if (rc) { | |
5bb0b55a | 1742 | tcp_ctask->xmstate |= XMSTATE_W_PAD; |
3219e529 | 1743 | return rc; |
7ba24713 AA |
1744 | } |
1745 | ||
1746 | if (conn->datadgst_en) { | |
5bb0b55a MC |
1747 | crypto_digest_update(tcp_conn->data_tx_tfm, |
1748 | &tcp_ctask->sendbuf.sg, 1); | |
7ba24713 AA |
1749 | /* imm data? */ |
1750 | if (!dtask) { | |
3219e529 | 1751 | rc = iscsi_digest_final_send(conn, ctask, |
5bb0b55a | 1752 | &tcp_ctask->immbuf, |
3219e529 MC |
1753 | &tcp_ctask->immdigest, 1); |
1754 | if (rc) { | |
7ba24713 | 1755 | debug_tcp("send padding digest 0x%x" |
5bb0b55a | 1756 | "fail!\n", tcp_ctask->immdigest); |
3219e529 | 1757 | return rc; |
7ba24713 AA |
1758 | } |
1759 | debug_tcp("done with padding, digest 0x%x\n", | |
5bb0b55a | 1760 | tcp_ctask->datadigest); |
7ba24713 | 1761 | } else { |
3219e529 | 1762 | rc = iscsi_digest_final_send(conn, ctask, |
7ba24713 | 1763 | &dtask->digestbuf, |
3219e529 MC |
1764 | &dtask->digest, 1); |
1765 | if (rc) { | |
7ba24713 AA |
1766 | debug_tcp("send padding digest 0x%x" |
1767 | "fail\n", dtask->digest); | |
3219e529 | 1768 | return rc; |
7ba24713 AA |
1769 | } |
1770 | debug_tcp("done with padding, digest 0x%x\n", | |
1771 | dtask->digest); | |
1772 | } | |
1773 | } | |
1774 | ||
1775 | return 0; | |
1776 | } | |
1777 | ||
1778 | static int | |
5bb0b55a | 1779 | iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
7ba24713 | 1780 | { |
5bb0b55a | 1781 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
1782 | int rc = 0; |
1783 | ||
1784 | debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", | |
5bb0b55a | 1785 | conn->id, tcp_ctask->xmstate, ctask->itt); |
7ba24713 AA |
1786 | |
1787 | /* | |
1788 | * serialize with TMF AbortTask | |
1789 | */ | |
1790 | if (ctask->mtask) | |
1791 | return rc; | |
1792 | ||
3219e529 MC |
1793 | if (tcp_ctask->xmstate & XMSTATE_R_HDR) |
1794 | return handle_xmstate_r_hdr(conn, tcp_ctask); | |
7ba24713 | 1795 | |
5bb0b55a | 1796 | if (tcp_ctask->xmstate & XMSTATE_W_HDR) { |
7ba24713 AA |
1797 | rc = handle_xmstate_w_hdr(conn, ctask); |
1798 | if (rc) | |
1799 | return rc; | |
1800 | } | |
1801 | ||
1802 | /* XXX: for data digest xmit recover */ | |
5bb0b55a | 1803 | if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) { |
7ba24713 AA |
1804 | rc = handle_xmstate_data_digest(conn, ctask); |
1805 | if (rc) | |
1806 | return rc; | |
1807 | } | |
1808 | ||
5bb0b55a | 1809 | if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { |
7ba24713 AA |
1810 | rc = handle_xmstate_imm_data(conn, ctask); |
1811 | if (rc) | |
1812 | return rc; | |
1813 | } | |
1814 | ||
5bb0b55a | 1815 | if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { |
7ba24713 | 1816 | BUG_ON(!ctask->unsol_count); |
5bb0b55a | 1817 | tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; |
7ba24713 AA |
1818 | unsolicit_head_again: |
1819 | rc = handle_xmstate_uns_hdr(conn, ctask); | |
1820 | if (rc) | |
1821 | return rc; | |
1822 | } | |
1823 | ||
5bb0b55a | 1824 | if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { |
7ba24713 AA |
1825 | rc = handle_xmstate_uns_data(conn, ctask); |
1826 | if (rc == 1) | |
1827 | goto unsolicit_head_again; | |
1828 | else if (rc) | |
1829 | return rc; | |
1830 | goto done; | |
1831 | } | |
1832 | ||
5bb0b55a | 1833 | if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { |
7ba24713 AA |
1834 | struct iscsi_r2t_info *r2t; |
1835 | ||
5bb0b55a MC |
1836 | tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; |
1837 | tcp_ctask->xmstate |= XMSTATE_SOL_DATA; | |
1838 | if (!tcp_ctask->r2t) | |
1839 | __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, | |
7ba24713 AA |
1840 | sizeof(void*)); |
1841 | solicit_head_again: | |
5bb0b55a | 1842 | r2t = tcp_ctask->r2t; |
af973481 | 1843 | if (conn->hdrdgst_en) |
42f72aa9 | 1844 | iscsi_hdr_digest(conn, &r2t->headbuf, |
ffbfe925 | 1845 | (u8*)r2t->dtask.hdrext); |
3219e529 MC |
1846 | rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count); |
1847 | if (rc) { | |
5bb0b55a MC |
1848 | tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; |
1849 | tcp_ctask->xmstate |= XMSTATE_SOL_HDR; | |
3219e529 | 1850 | return rc; |
7ba24713 AA |
1851 | } |
1852 | ||
1853 | debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", | |
1854 | r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, | |
1855 | r2t->sent); | |
1856 | } | |
1857 | ||
5bb0b55a | 1858 | if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { |
7ba24713 AA |
1859 | rc = handle_xmstate_sol_data(conn, ctask); |
1860 | if (rc == 1) | |
1861 | goto solicit_head_again; | |
1862 | if (rc) | |
1863 | return rc; | |
1864 | } | |
1865 | ||
1866 | done: | |
1867 | /* | |
1868 | * Last thing to check is whether we need to send write | |
1869 | * padding. Note that we check for xmstate equality, not just the bit. | |
1870 | */ | |
5bb0b55a | 1871 | if (tcp_ctask->xmstate == XMSTATE_W_PAD) |
7ba24713 AA |
1872 | rc = handle_xmstate_w_pad(conn, ctask); |
1873 | ||
1874 | return rc; | |
1875 | } | |
1876 | ||
5bb0b55a MC |
1877 | static struct iscsi_cls_conn * |
1878 | iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
7ba24713 | 1879 | { |
5bb0b55a MC |
1880 | struct iscsi_conn *conn; |
1881 | struct iscsi_cls_conn *cls_conn; | |
1882 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 | 1883 | |
5bb0b55a MC |
1884 | cls_conn = iscsi_conn_setup(cls_session, conn_idx); |
1885 | if (!cls_conn) | |
1886 | return NULL; | |
1887 | conn = cls_conn->dd_data; | |
7ba24713 | 1888 | /* |
5bb0b55a MC |
1889 | * due to strange issues with iser these are not set |
1890 | * in iscsi_conn_setup | |
7ba24713 | 1891 | */ |
5bb0b55a | 1892 | conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; |
7ba24713 | 1893 | |
5bb0b55a MC |
1894 | tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); |
1895 | if (!tcp_conn) | |
1896 | goto tcp_conn_alloc_fail; | |
7ba24713 | 1897 | |
5bb0b55a MC |
1898 | conn->dd_data = tcp_conn; |
1899 | tcp_conn->iscsi_conn = conn; | |
1900 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
1901 | /* initial operational parameters */ | |
1902 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); | |
1903 | tcp_conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; | |
7ba24713 | 1904 | |
5bb0b55a MC |
1905 | /* allocate initial PDU receive place holder */ |
1906 | if (tcp_conn->data_size <= PAGE_SIZE) | |
1907 | tcp_conn->data = kmalloc(tcp_conn->data_size, GFP_KERNEL); | |
1908 | else | |
1909 | tcp_conn->data = (void*)__get_free_pages(GFP_KERNEL, | |
1910 | get_order(tcp_conn->data_size)); | |
1911 | if (!tcp_conn->data) | |
1912 | goto max_recv_dlenght_alloc_fail; | |
7ba24713 | 1913 | |
5bb0b55a | 1914 | return cls_conn; |
7ba24713 | 1915 | |
5bb0b55a MC |
1916 | max_recv_dlenght_alloc_fail: |
1917 | kfree(tcp_conn); | |
1918 | tcp_conn_alloc_fail: | |
1919 | iscsi_conn_teardown(cls_conn); | |
1920 | return NULL; | |
7ba24713 AA |
1921 | } |
1922 | ||
1923 | static void | |
5bb0b55a | 1924 | iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 1925 | { |
5bb0b55a MC |
1926 | struct iscsi_conn *conn = cls_conn->dd_data; |
1927 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1928 | int digest = 0; | |
7ba24713 | 1929 | |
5bb0b55a MC |
1930 | if (conn->hdrdgst_en || conn->datadgst_en) |
1931 | digest = 1; | |
7ba24713 | 1932 | |
5bb0b55a | 1933 | iscsi_conn_teardown(cls_conn); |
7ba24713 | 1934 | |
5bb0b55a MC |
1935 | /* now free tcp_conn */ |
1936 | if (digest) { | |
1937 | if (tcp_conn->tx_tfm) | |
1938 | crypto_free_tfm(tcp_conn->tx_tfm); | |
1939 | if (tcp_conn->rx_tfm) | |
1940 | crypto_free_tfm(tcp_conn->rx_tfm); | |
1941 | if (tcp_conn->data_tx_tfm) | |
1942 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
1943 | if (tcp_conn->data_rx_tfm) | |
1944 | crypto_free_tfm(tcp_conn->data_rx_tfm); | |
1945 | } | |
7ba24713 | 1946 | |
5bb0b55a MC |
1947 | /* free conn->data, size = MaxRecvDataSegmentLength */ |
1948 | if (tcp_conn->data_size <= PAGE_SIZE) | |
1949 | kfree(tcp_conn->data); | |
1950 | else | |
1951 | free_pages((unsigned long)tcp_conn->data, | |
1952 | get_order(tcp_conn->data_size)); | |
1953 | kfree(tcp_conn); | |
1954 | } | |
7ba24713 | 1955 | |
5bb0b55a MC |
1956 | static int |
1957 | iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, | |
264faaaa | 1958 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
5bb0b55a MC |
1959 | int is_leading) |
1960 | { | |
1961 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1962 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1963 | struct sock *sk; | |
1964 | struct socket *sock; | |
1965 | int err; | |
7ba24713 | 1966 | |
5bb0b55a | 1967 | /* lookup for existing socket */ |
264faaaa | 1968 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a MC |
1969 | if (!sock) { |
1970 | printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); | |
1971 | return -EEXIST; | |
7ba24713 AA |
1972 | } |
1973 | ||
5bb0b55a MC |
1974 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
1975 | if (err) | |
1976 | return err; | |
7ba24713 | 1977 | |
67a61114 MC |
1978 | /* bind iSCSI connection and socket */ |
1979 | tcp_conn->sock = sock; | |
7ba24713 | 1980 | |
67a61114 MC |
1981 | /* setup Socket parameters */ |
1982 | sk = sock->sk; | |
1983 | sk->sk_reuse = 1; | |
1984 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
1985 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 1986 | |
67a61114 | 1987 | /* FIXME: disable Nagle's algorithm */ |
7ba24713 | 1988 | |
67a61114 MC |
1989 | /* |
1990 | * Intercept TCP callbacks for sendfile like receive | |
1991 | * processing. | |
1992 | */ | |
1993 | conn->recv_lock = &sk->sk_callback_lock; | |
1994 | iscsi_conn_set_callbacks(conn); | |
1995 | tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; | |
1996 | /* | |
1997 | * set receive state machine into initial state | |
1998 | */ | |
1999 | tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; | |
7ba24713 | 2000 | |
7ba24713 AA |
2001 | return 0; |
2002 | } | |
2003 | ||
30a6c652 | 2004 | static void |
5bb0b55a | 2005 | iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) |
30a6c652 | 2006 | { |
5bb0b55a | 2007 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
30a6c652 | 2008 | struct iscsi_r2t_info *r2t; |
30a6c652 MC |
2009 | |
2010 | /* flush ctask's r2t queues */ | |
5bb0b55a MC |
2011 | while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) |
2012 | __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, | |
30a6c652 | 2013 | sizeof(void*)); |
30a6c652 | 2014 | |
5bb0b55a | 2015 | __iscsi_ctask_cleanup(conn, ctask); |
30a6c652 MC |
2016 | } |
2017 | ||
2018 | static void | |
5bb0b55a | 2019 | iscsi_tcp_suspend_conn_rx(struct iscsi_conn *conn) |
30a6c652 | 2020 | { |
5bb0b55a | 2021 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 2022 | struct sock *sk; |
7ba24713 | 2023 | |
5bb0b55a MC |
2024 | if (!tcp_conn->sock) |
2025 | return; | |
2026 | ||
2027 | sk = tcp_conn->sock->sk; | |
7ba24713 | 2028 | write_lock_bh(&sk->sk_callback_lock); |
5bb0b55a | 2029 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); |
7ba24713 | 2030 | write_unlock_bh(&sk->sk_callback_lock); |
30a6c652 | 2031 | } |
7ba24713 | 2032 | |
30a6c652 | 2033 | static void |
5bb0b55a | 2034 | iscsi_tcp_terminate_conn(struct iscsi_conn *conn) |
30a6c652 | 2035 | { |
5bb0b55a | 2036 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 2037 | |
5bb0b55a MC |
2038 | if (!tcp_conn->sock) |
2039 | return; | |
7ba24713 | 2040 | |
5bb0b55a | 2041 | sock_hold(tcp_conn->sock->sk); |
30a6c652 | 2042 | iscsi_conn_restore_callbacks(conn); |
5bb0b55a | 2043 | sock_put(tcp_conn->sock->sk); |
7ba24713 | 2044 | |
5bb0b55a MC |
2045 | sock_release(tcp_conn->sock); |
2046 | tcp_conn->sock = NULL; | |
2047 | conn->recv_lock = NULL; | |
7ba24713 AA |
2048 | } |
2049 | ||
5bb0b55a | 2050 | /* called with host lock */ |
30a6c652 | 2051 | static void |
5bb0b55a MC |
2052 | iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask, |
2053 | char *data, uint32_t data_size) | |
7ba24713 | 2054 | { |
5bb0b55a | 2055 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; |
7ba24713 | 2056 | |
6e458cc9 MC |
2057 | iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr, |
2058 | sizeof(struct iscsi_hdr)); | |
5bb0b55a | 2059 | tcp_mtask->xmstate = XMSTATE_IMM_HDR; |
7ba24713 | 2060 | |
5bb0b55a MC |
2061 | if (mtask->data_count) |
2062 | iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data, | |
7ba24713 | 2063 | mtask->data_count); |
7ba24713 AA |
2064 | } |
2065 | ||
2066 | static int | |
2067 | iscsi_r2tpool_alloc(struct iscsi_session *session) | |
2068 | { | |
2069 | int i; | |
2070 | int cmd_i; | |
2071 | ||
2072 | /* | |
2073 | * initialize per-task: R2T pool and xmit queue | |
2074 | */ | |
2075 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2076 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
5bb0b55a | 2077 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; |
7ba24713 AA |
2078 | |
2079 | /* | |
2080 | * pre-allocated x4 as much r2ts to handle race when | |
2081 | * target acks DataOut faster than we data_xmit() queues | |
2082 | * could replenish r2tqueue. | |
2083 | */ | |
2084 | ||
2085 | /* R2T pool */ | |
5bb0b55a MC |
2086 | if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, |
2087 | (void***)&tcp_ctask->r2ts, | |
2088 | sizeof(struct iscsi_r2t_info))) { | |
7ba24713 AA |
2089 | goto r2t_alloc_fail; |
2090 | } | |
2091 | ||
2092 | /* R2T xmit queue */ | |
5bb0b55a | 2093 | tcp_ctask->r2tqueue = kfifo_alloc( |
7ba24713 | 2094 | session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); |
5bb0b55a MC |
2095 | if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { |
2096 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2097 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2098 | goto r2t_alloc_fail; |
2099 | } | |
7ba24713 AA |
2100 | } |
2101 | ||
2102 | return 0; | |
2103 | ||
2104 | r2t_alloc_fail: | |
2105 | for (i = 0; i < cmd_i; i++) { | |
5bb0b55a MC |
2106 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2107 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2108 | ||
5bb0b55a MC |
2109 | kfifo_free(tcp_ctask->r2tqueue); |
2110 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2111 | (void**)tcp_ctask->r2ts); | |
7ba24713 AA |
2112 | } |
2113 | return -ENOMEM; | |
2114 | } | |
2115 | ||
2116 | static void | |
2117 | iscsi_r2tpool_free(struct iscsi_session *session) | |
2118 | { | |
2119 | int i; | |
2120 | ||
2121 | for (i = 0; i < session->cmds_max; i++) { | |
5bb0b55a MC |
2122 | struct iscsi_cmd_task *ctask = session->cmds[i]; |
2123 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
7ba24713 | 2124 | |
5bb0b55a MC |
2125 | kfifo_free(tcp_ctask->r2tqueue); |
2126 | iscsi_pool_free(&tcp_ctask->r2tpool, | |
2127 | (void**)tcp_ctask->r2ts); | |
7ba24713 | 2128 | } |
7ba24713 AA |
2129 | } |
2130 | ||
2131 | static int | |
7b7232f3 | 2132 | iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, |
7ba24713 AA |
2133 | uint32_t value) |
2134 | { | |
7b7232f3 | 2135 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 2136 | struct iscsi_session *session = conn->session; |
5bb0b55a | 2137 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 | 2138 | |
7ba24713 AA |
2139 | switch(param) { |
2140 | case ISCSI_PARAM_MAX_RECV_DLENGTH: { | |
5bb0b55a | 2141 | char *saveptr = tcp_conn->data; |
b53cb2a4 | 2142 | gfp_t flags = GFP_KERNEL; |
7ba24713 | 2143 | |
5bb0b55a | 2144 | if (tcp_conn->data_size >= value) { |
7ba24713 AA |
2145 | conn->max_recv_dlength = value; |
2146 | break; | |
2147 | } | |
2148 | ||
2149 | spin_lock_bh(&session->lock); | |
2150 | if (conn->stop_stage == STOP_CONN_RECOVER) | |
2151 | flags = GFP_ATOMIC; | |
2152 | spin_unlock_bh(&session->lock); | |
2153 | ||
2154 | if (value <= PAGE_SIZE) | |
5bb0b55a | 2155 | tcp_conn->data = kmalloc(value, flags); |
7ba24713 | 2156 | else |
5bb0b55a | 2157 | tcp_conn->data = (void*)__get_free_pages(flags, |
7ba24713 | 2158 | get_order(value)); |
5bb0b55a MC |
2159 | if (tcp_conn->data == NULL) { |
2160 | tcp_conn->data = saveptr; | |
7ba24713 AA |
2161 | return -ENOMEM; |
2162 | } | |
5bb0b55a | 2163 | if (tcp_conn->data_size <= PAGE_SIZE) |
7ba24713 AA |
2164 | kfree(saveptr); |
2165 | else | |
2166 | free_pages((unsigned long)saveptr, | |
5bb0b55a | 2167 | get_order(tcp_conn->data_size)); |
7ba24713 | 2168 | conn->max_recv_dlength = value; |
5bb0b55a | 2169 | tcp_conn->data_size = value; |
7ba24713 AA |
2170 | } |
2171 | break; | |
2172 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2173 | conn->max_xmit_dlength = value; | |
2174 | break; | |
2175 | case ISCSI_PARAM_HDRDGST_EN: | |
2176 | conn->hdrdgst_en = value; | |
5bb0b55a | 2177 | tcp_conn->hdr_size = sizeof(struct iscsi_hdr); |
7ba24713 | 2178 | if (conn->hdrdgst_en) { |
5bb0b55a MC |
2179 | tcp_conn->hdr_size += sizeof(__u32); |
2180 | if (!tcp_conn->tx_tfm) | |
2181 | tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c", | |
2182 | 0); | |
2183 | if (!tcp_conn->tx_tfm) | |
7ba24713 | 2184 | return -ENOMEM; |
5bb0b55a MC |
2185 | if (!tcp_conn->rx_tfm) |
2186 | tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c", | |
2187 | 0); | |
2188 | if (!tcp_conn->rx_tfm) { | |
2189 | crypto_free_tfm(tcp_conn->tx_tfm); | |
7ba24713 AA |
2190 | return -ENOMEM; |
2191 | } | |
2192 | } else { | |
5bb0b55a MC |
2193 | if (tcp_conn->tx_tfm) |
2194 | crypto_free_tfm(tcp_conn->tx_tfm); | |
2195 | if (tcp_conn->rx_tfm) | |
2196 | crypto_free_tfm(tcp_conn->rx_tfm); | |
7ba24713 AA |
2197 | } |
2198 | break; | |
2199 | case ISCSI_PARAM_DATADGST_EN: | |
2200 | conn->datadgst_en = value; | |
2201 | if (conn->datadgst_en) { | |
5bb0b55a MC |
2202 | if (!tcp_conn->data_tx_tfm) |
2203 | tcp_conn->data_tx_tfm = | |
7ba24713 | 2204 | crypto_alloc_tfm("crc32c", 0); |
5bb0b55a | 2205 | if (!tcp_conn->data_tx_tfm) |
7ba24713 | 2206 | return -ENOMEM; |
5bb0b55a MC |
2207 | if (!tcp_conn->data_rx_tfm) |
2208 | tcp_conn->data_rx_tfm = | |
7ba24713 | 2209 | crypto_alloc_tfm("crc32c", 0); |
5bb0b55a MC |
2210 | if (!tcp_conn->data_rx_tfm) { |
2211 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
7ba24713 AA |
2212 | return -ENOMEM; |
2213 | } | |
2214 | } else { | |
5bb0b55a MC |
2215 | if (tcp_conn->data_tx_tfm) |
2216 | crypto_free_tfm(tcp_conn->data_tx_tfm); | |
2217 | if (tcp_conn->data_rx_tfm) | |
2218 | crypto_free_tfm(tcp_conn->data_rx_tfm); | |
7ba24713 | 2219 | } |
5bb0b55a MC |
2220 | tcp_conn->sendpage = conn->datadgst_en ? |
2221 | sock_no_sendpage : tcp_conn->sock->ops->sendpage; | |
7ba24713 AA |
2222 | break; |
2223 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2224 | session->initial_r2t_en = value; | |
2225 | break; | |
2226 | case ISCSI_PARAM_MAX_R2T: | |
2227 | if (session->max_r2t == roundup_pow_of_two(value)) | |
2228 | break; | |
2229 | iscsi_r2tpool_free(session); | |
2230 | session->max_r2t = value; | |
2231 | if (session->max_r2t & (session->max_r2t - 1)) | |
2232 | session->max_r2t = roundup_pow_of_two(session->max_r2t); | |
2233 | if (iscsi_r2tpool_alloc(session)) | |
2234 | return -ENOMEM; | |
2235 | break; | |
2236 | case ISCSI_PARAM_IMM_DATA_EN: | |
2237 | session->imm_data_en = value; | |
2238 | break; | |
2239 | case ISCSI_PARAM_FIRST_BURST: | |
2240 | session->first_burst = value; | |
2241 | break; | |
2242 | case ISCSI_PARAM_MAX_BURST: | |
2243 | session->max_burst = value; | |
2244 | break; | |
2245 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2246 | session->pdu_inorder_en = value; | |
2247 | break; | |
2248 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2249 | session->dataseq_inorder_en = value; | |
2250 | break; | |
2251 | case ISCSI_PARAM_ERL: | |
2252 | session->erl = value; | |
2253 | break; | |
2254 | case ISCSI_PARAM_IFMARKER_EN: | |
2255 | BUG_ON(value); | |
2256 | session->ifmarker_en = value; | |
2257 | break; | |
2258 | case ISCSI_PARAM_OFMARKER_EN: | |
2259 | BUG_ON(value); | |
2260 | session->ofmarker_en = value; | |
2261 | break; | |
8d2860b3 MC |
2262 | case ISCSI_PARAM_EXP_STATSN: |
2263 | conn->exp_statsn = value; | |
2264 | break; | |
7ba24713 AA |
2265 | default: |
2266 | break; | |
2267 | } | |
2268 | ||
2269 | return 0; | |
2270 | } | |
2271 | ||
2272 | static int | |
7b7232f3 | 2273 | iscsi_session_get_param(struct iscsi_cls_session *cls_session, |
7b8631b5 | 2274 | enum iscsi_param param, uint32_t *value) |
7ba24713 | 2275 | { |
7b7232f3 | 2276 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
7b8631b5 | 2277 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); |
7ba24713 AA |
2278 | |
2279 | switch(param) { | |
7ba24713 AA |
2280 | case ISCSI_PARAM_INITIAL_R2T_EN: |
2281 | *value = session->initial_r2t_en; | |
2282 | break; | |
2283 | case ISCSI_PARAM_MAX_R2T: | |
2284 | *value = session->max_r2t; | |
2285 | break; | |
2286 | case ISCSI_PARAM_IMM_DATA_EN: | |
2287 | *value = session->imm_data_en; | |
2288 | break; | |
2289 | case ISCSI_PARAM_FIRST_BURST: | |
2290 | *value = session->first_burst; | |
2291 | break; | |
2292 | case ISCSI_PARAM_MAX_BURST: | |
2293 | *value = session->max_burst; | |
2294 | break; | |
2295 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2296 | *value = session->pdu_inorder_en; | |
2297 | break; | |
2298 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2299 | *value = session->dataseq_inorder_en; | |
2300 | break; | |
2301 | case ISCSI_PARAM_ERL: | |
2302 | *value = session->erl; | |
2303 | break; | |
2304 | case ISCSI_PARAM_IFMARKER_EN: | |
2305 | *value = session->ifmarker_en; | |
2306 | break; | |
2307 | case ISCSI_PARAM_OFMARKER_EN: | |
2308 | *value = session->ofmarker_en; | |
2309 | break; | |
2310 | default: | |
fd7255f5 | 2311 | return -EINVAL; |
7ba24713 AA |
2312 | } |
2313 | ||
2314 | return 0; | |
2315 | } | |
2316 | ||
7b8631b5 | 2317 | static int |
7b7232f3 MC |
2318 | iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
2319 | enum iscsi_param param, uint32_t *value) | |
7b8631b5 | 2320 | { |
7b7232f3 | 2321 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2322 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
fd7255f5 | 2323 | struct inet_sock *inet; |
7b8631b5 MC |
2324 | |
2325 | switch(param) { | |
2326 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
2327 | *value = conn->max_recv_dlength; | |
2328 | break; | |
2329 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2330 | *value = conn->max_xmit_dlength; | |
2331 | break; | |
2332 | case ISCSI_PARAM_HDRDGST_EN: | |
2333 | *value = conn->hdrdgst_en; | |
2334 | break; | |
2335 | case ISCSI_PARAM_DATADGST_EN: | |
2336 | *value = conn->datadgst_en; | |
2337 | break; | |
fd7255f5 MC |
2338 | case ISCSI_PARAM_CONN_PORT: |
2339 | mutex_lock(&conn->xmitmutex); | |
5bb0b55a | 2340 | if (!tcp_conn->sock) { |
fd7255f5 MC |
2341 | mutex_unlock(&conn->xmitmutex); |
2342 | return -EINVAL; | |
2343 | } | |
2344 | ||
5bb0b55a | 2345 | inet = inet_sk(tcp_conn->sock->sk); |
fd7255f5 MC |
2346 | *value = be16_to_cpu(inet->dport); |
2347 | mutex_unlock(&conn->xmitmutex); | |
8d2860b3 MC |
2348 | case ISCSI_PARAM_EXP_STATSN: |
2349 | *value = conn->exp_statsn; | |
2350 | break; | |
7b8631b5 | 2351 | default: |
fd7255f5 | 2352 | return -EINVAL; |
7b8631b5 MC |
2353 | } |
2354 | ||
2355 | return 0; | |
2356 | } | |
2357 | ||
fd7255f5 MC |
2358 | static int |
2359 | iscsi_conn_get_str_param(struct iscsi_cls_conn *cls_conn, | |
2360 | enum iscsi_param param, char *buf) | |
2361 | { | |
2362 | struct iscsi_conn *conn = cls_conn->dd_data; | |
5bb0b55a | 2363 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
fd7255f5 MC |
2364 | struct sock *sk; |
2365 | struct inet_sock *inet; | |
2366 | struct ipv6_pinfo *np; | |
2367 | int len = 0; | |
2368 | ||
2369 | switch (param) { | |
2370 | case ISCSI_PARAM_CONN_ADDRESS: | |
2371 | mutex_lock(&conn->xmitmutex); | |
5bb0b55a | 2372 | if (!tcp_conn->sock) { |
fd7255f5 MC |
2373 | mutex_unlock(&conn->xmitmutex); |
2374 | return -EINVAL; | |
2375 | } | |
2376 | ||
5bb0b55a | 2377 | sk = tcp_conn->sock->sk; |
fd7255f5 MC |
2378 | if (sk->sk_family == PF_INET) { |
2379 | inet = inet_sk(sk); | |
2380 | len = sprintf(buf, "%u.%u.%u.%u\n", | |
2381 | NIPQUAD(inet->daddr)); | |
2382 | } else { | |
2383 | np = inet6_sk(sk); | |
2384 | len = sprintf(buf, | |
2385 | "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
2386 | NIP6(np->daddr)); | |
2387 | } | |
2388 | mutex_unlock(&conn->xmitmutex); | |
2389 | break; | |
2390 | default: | |
2391 | return -EINVAL; | |
2392 | } | |
2393 | ||
2394 | return len; | |
2395 | } | |
2396 | ||
7ba24713 | 2397 | static void |
7b7232f3 | 2398 | iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
7ba24713 | 2399 | { |
7b7232f3 | 2400 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 2401 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
7ba24713 AA |
2402 | |
2403 | stats->txdata_octets = conn->txdata_octets; | |
2404 | stats->rxdata_octets = conn->rxdata_octets; | |
2405 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
2406 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
2407 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
2408 | stats->datain_pdus = conn->datain_pdus_cnt; | |
2409 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
2410 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
2411 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
2412 | stats->custom_length = 3; | |
2413 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
5bb0b55a | 2414 | stats->custom[0].value = tcp_conn->sendpage_failures_cnt; |
7ba24713 | 2415 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
5bb0b55a | 2416 | stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
2417 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
2418 | stats->custom[2].value = conn->eh_abort_cnt; | |
2419 | } | |
2420 | ||
5bb0b55a MC |
2421 | static struct iscsi_cls_session * |
2422 | iscsi_tcp_session_create(struct iscsi_transport *iscsit, | |
2423 | struct scsi_transport_template *scsit, | |
2424 | uint32_t initial_cmdsn, uint32_t *hostno) | |
7ba24713 | 2425 | { |
5bb0b55a MC |
2426 | struct iscsi_cls_session *cls_session; |
2427 | struct iscsi_session *session; | |
2428 | uint32_t hn; | |
2429 | int cmd_i; | |
7ba24713 | 2430 | |
5bb0b55a MC |
2431 | cls_session = iscsi_session_setup(iscsit, scsit, |
2432 | sizeof(struct iscsi_tcp_cmd_task), | |
2433 | sizeof(struct iscsi_tcp_mgmt_task), | |
2434 | initial_cmdsn, &hn); | |
2435 | if (!cls_session) | |
2436 | return NULL; | |
2437 | *hostno = hn; | |
7ba24713 | 2438 | |
5bb0b55a MC |
2439 | session = class_to_transport_session(cls_session); |
2440 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2441 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
2442 | struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; | |
2443 | ||
2444 | ctask->hdr = &tcp_ctask->hdr; | |
2445 | } | |
2446 | ||
2447 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
2448 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
2449 | struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; | |
2450 | ||
2451 | mtask->hdr = &tcp_mtask->hdr; | |
2452 | } | |
2453 | ||
2454 | if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) | |
2455 | goto r2tpool_alloc_fail; | |
2456 | ||
2457 | return cls_session; | |
2458 | ||
2459 | r2tpool_alloc_fail: | |
2460 | iscsi_session_teardown(cls_session); | |
2461 | return NULL; | |
2462 | } | |
2463 | ||
2464 | static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) | |
2465 | { | |
5bb0b55a MC |
2466 | iscsi_r2tpool_free(class_to_transport_session(cls_session)); |
2467 | iscsi_session_teardown(cls_session); | |
7ba24713 AA |
2468 | } |
2469 | ||
5bb0b55a | 2470 | static struct scsi_host_template iscsi_sht = { |
e0ecae8d MC |
2471 | .name = "iSCSI Initiator over TCP/IP, v" |
2472 | ISCSI_TCP_VERSION, | |
5bb0b55a MC |
2473 | .queuecommand = iscsi_queuecommand, |
2474 | .change_queue_depth = iscsi_change_queue_depth, | |
2475 | .can_queue = ISCSI_XMIT_CMDS_MAX - 1, | |
2476 | .sg_tablesize = ISCSI_SG_TABLESIZE, | |
2477 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, | |
2478 | .eh_abort_handler = iscsi_eh_abort, | |
2479 | .eh_host_reset_handler = iscsi_eh_host_reset, | |
2480 | .use_clustering = DISABLE_CLUSTERING, | |
2481 | .proc_name = "iscsi_tcp", | |
2482 | .this_id = -1, | |
2483 | }; | |
2484 | ||
7ba24713 AA |
2485 | static struct iscsi_transport iscsi_tcp_transport = { |
2486 | .owner = THIS_MODULE, | |
2487 | .name = "tcp", | |
2488 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
2489 | | CAP_DATADGST, | |
fd7255f5 MC |
2490 | .param_mask = ISCSI_MAX_RECV_DLENGTH | |
2491 | ISCSI_MAX_XMIT_DLENGTH | | |
2492 | ISCSI_HDRDGST_EN | | |
2493 | ISCSI_DATADGST_EN | | |
2494 | ISCSI_INITIAL_R2T_EN | | |
2495 | ISCSI_MAX_R2T | | |
2496 | ISCSI_IMM_DATA_EN | | |
2497 | ISCSI_FIRST_BURST | | |
2498 | ISCSI_MAX_BURST | | |
2499 | ISCSI_PDU_INORDER_EN | | |
2500 | ISCSI_DATASEQ_INORDER_EN | | |
2501 | ISCSI_ERL | | |
2502 | ISCSI_CONN_PORT | | |
8d2860b3 MC |
2503 | ISCSI_CONN_ADDRESS | |
2504 | ISCSI_EXP_STATSN, | |
7ba24713 | 2505 | .host_template = &iscsi_sht, |
7b8631b5 | 2506 | .conndata_size = sizeof(struct iscsi_conn), |
7ba24713 AA |
2507 | .max_conn = 1, |
2508 | .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, | |
5bb0b55a MC |
2509 | /* session management */ |
2510 | .create_session = iscsi_tcp_session_create, | |
2511 | .destroy_session = iscsi_tcp_session_destroy, | |
2512 | /* connection management */ | |
2513 | .create_conn = iscsi_tcp_conn_create, | |
2514 | .bind_conn = iscsi_tcp_conn_bind, | |
2515 | .destroy_conn = iscsi_tcp_conn_destroy, | |
7ba24713 | 2516 | .set_param = iscsi_conn_set_param, |
7b8631b5 | 2517 | .get_conn_param = iscsi_conn_get_param, |
fd7255f5 | 2518 | .get_conn_str_param = iscsi_conn_get_str_param, |
7b8631b5 | 2519 | .get_session_param = iscsi_session_get_param, |
7ba24713 AA |
2520 | .start_conn = iscsi_conn_start, |
2521 | .stop_conn = iscsi_conn_stop, | |
5bb0b55a MC |
2522 | /* these are called as part of conn recovery */ |
2523 | .suspend_conn_recv = iscsi_tcp_suspend_conn_rx, | |
2524 | .terminate_conn = iscsi_tcp_terminate_conn, | |
2525 | /* IO */ | |
7ba24713 AA |
2526 | .send_pdu = iscsi_conn_send_pdu, |
2527 | .get_stats = iscsi_conn_get_stats, | |
5bb0b55a MC |
2528 | .init_cmd_task = iscsi_tcp_cmd_init, |
2529 | .init_mgmt_task = iscsi_tcp_mgmt_init, | |
2530 | .xmit_cmd_task = iscsi_tcp_ctask_xmit, | |
2531 | .xmit_mgmt_task = iscsi_tcp_mtask_xmit, | |
2532 | .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, | |
2533 | /* recovery */ | |
30a6c652 | 2534 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
2535 | }; |
2536 | ||
2537 | static int __init | |
2538 | iscsi_tcp_init(void) | |
2539 | { | |
7ba24713 | 2540 | if (iscsi_max_lun < 1) { |
be2df72e OG |
2541 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
2542 | iscsi_max_lun); | |
7ba24713 AA |
2543 | return -EINVAL; |
2544 | } | |
2545 | iscsi_tcp_transport.max_lun = iscsi_max_lun; | |
2546 | ||
7b8631b5 | 2547 | if (!iscsi_register_transport(&iscsi_tcp_transport)) |
ffbfe925 | 2548 | return -ENODEV; |
7ba24713 | 2549 | |
7b8631b5 | 2550 | return 0; |
7ba24713 AA |
2551 | } |
2552 | ||
2553 | static void __exit | |
2554 | iscsi_tcp_exit(void) | |
2555 | { | |
2556 | iscsi_unregister_transport(&iscsi_tcp_transport); | |
7ba24713 AA |
2557 | } |
2558 | ||
2559 | module_init(iscsi_tcp_init); | |
2560 | module_exit(iscsi_tcp_exit); |