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e85b24b5 OG |
1 | /* |
2 | * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | * | |
32 | * $Id: iser_initiator.c 6964 2006-05-07 11:11:43Z ogerlitz $ | |
33 | */ | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/mm.h> | |
e85b24b5 OG |
37 | #include <linux/scatterlist.h> |
38 | #include <linux/kfifo.h> | |
39 | #include <scsi/scsi_cmnd.h> | |
40 | #include <scsi/scsi_host.h> | |
41 | ||
42 | #include "iscsi_iser.h" | |
43 | ||
44 | /* Constant PDU lengths calculations */ | |
45 | #define ISER_TOTAL_HEADERS_LEN (sizeof (struct iser_hdr) + \ | |
46 | sizeof (struct iscsi_hdr)) | |
47 | ||
48 | /* iser_dto_add_regd_buff - increments the reference count for * | |
49 | * the registered buffer & adds it to the DTO object */ | |
50 | static void iser_dto_add_regd_buff(struct iser_dto *dto, | |
51 | struct iser_regd_buf *regd_buf, | |
52 | unsigned long use_offset, | |
53 | unsigned long use_size) | |
54 | { | |
55 | int add_idx; | |
56 | ||
57 | atomic_inc(®d_buf->ref_count); | |
58 | ||
59 | add_idx = dto->regd_vector_len; | |
60 | dto->regd[add_idx] = regd_buf; | |
61 | dto->used_sz[add_idx] = use_size; | |
62 | dto->offset[add_idx] = use_offset; | |
63 | ||
64 | dto->regd_vector_len++; | |
65 | } | |
66 | ||
e85b24b5 OG |
67 | /* Register user buffer memory and initialize passive rdma |
68 | * dto descriptor. Total data size is stored in | |
2261ec3d | 69 | * iser_task->data[ISER_DIR_IN].data_len |
e85b24b5 | 70 | */ |
2261ec3d | 71 | static int iser_prepare_read_cmd(struct iscsi_task *task, |
e85b24b5 OG |
72 | unsigned int edtl) |
73 | ||
74 | { | |
2261ec3d | 75 | struct iscsi_iser_task *iser_task = task->dd_data; |
e85b24b5 OG |
76 | struct iser_regd_buf *regd_buf; |
77 | int err; | |
2261ec3d MC |
78 | struct iser_hdr *hdr = &iser_task->desc.iser_header; |
79 | struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN]; | |
e85b24b5 | 80 | |
2261ec3d | 81 | err = iser_dma_map_task_data(iser_task, |
e85b24b5 OG |
82 | buf_in, |
83 | ISER_DIR_IN, | |
84 | DMA_FROM_DEVICE); | |
85 | if (err) | |
86 | return err; | |
87 | ||
2261ec3d | 88 | if (edtl > iser_task->data[ISER_DIR_IN].data_len) { |
e85b24b5 OG |
89 | iser_err("Total data length: %ld, less than EDTL: " |
90 | "%d, in READ cmd BHS itt: %d, conn: 0x%p\n", | |
2261ec3d MC |
91 | iser_task->data[ISER_DIR_IN].data_len, edtl, |
92 | task->itt, iser_task->iser_conn); | |
e85b24b5 OG |
93 | return -EINVAL; |
94 | } | |
95 | ||
2261ec3d | 96 | err = iser_reg_rdma_mem(iser_task,ISER_DIR_IN); |
e85b24b5 OG |
97 | if (err) { |
98 | iser_err("Failed to set up Data-IN RDMA\n"); | |
99 | return err; | |
100 | } | |
2261ec3d | 101 | regd_buf = &iser_task->rdma_regd[ISER_DIR_IN]; |
e85b24b5 OG |
102 | |
103 | hdr->flags |= ISER_RSV; | |
104 | hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey); | |
105 | hdr->read_va = cpu_to_be64(regd_buf->reg.va); | |
106 | ||
107 | iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", | |
2261ec3d | 108 | task->itt, regd_buf->reg.rkey, |
e85b24b5 OG |
109 | (unsigned long long)regd_buf->reg.va); |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | /* Register user buffer memory and initialize passive rdma | |
115 | * dto descriptor. Total data size is stored in | |
2261ec3d | 116 | * task->data[ISER_DIR_OUT].data_len |
e85b24b5 OG |
117 | */ |
118 | static int | |
2261ec3d | 119 | iser_prepare_write_cmd(struct iscsi_task *task, |
e85b24b5 OG |
120 | unsigned int imm_sz, |
121 | unsigned int unsol_sz, | |
122 | unsigned int edtl) | |
123 | { | |
2261ec3d | 124 | struct iscsi_iser_task *iser_task = task->dd_data; |
e85b24b5 OG |
125 | struct iser_regd_buf *regd_buf; |
126 | int err; | |
2261ec3d MC |
127 | struct iser_dto *send_dto = &iser_task->desc.dto; |
128 | struct iser_hdr *hdr = &iser_task->desc.iser_header; | |
129 | struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT]; | |
e85b24b5 | 130 | |
2261ec3d | 131 | err = iser_dma_map_task_data(iser_task, |
e85b24b5 OG |
132 | buf_out, |
133 | ISER_DIR_OUT, | |
134 | DMA_TO_DEVICE); | |
135 | if (err) | |
136 | return err; | |
137 | ||
2261ec3d | 138 | if (edtl > iser_task->data[ISER_DIR_OUT].data_len) { |
e85b24b5 OG |
139 | iser_err("Total data length: %ld, less than EDTL: %d, " |
140 | "in WRITE cmd BHS itt: %d, conn: 0x%p\n", | |
2261ec3d MC |
141 | iser_task->data[ISER_DIR_OUT].data_len, |
142 | edtl, task->itt, task->conn); | |
e85b24b5 OG |
143 | return -EINVAL; |
144 | } | |
145 | ||
2261ec3d | 146 | err = iser_reg_rdma_mem(iser_task,ISER_DIR_OUT); |
e85b24b5 OG |
147 | if (err != 0) { |
148 | iser_err("Failed to register write cmd RDMA mem\n"); | |
149 | return err; | |
150 | } | |
151 | ||
2261ec3d | 152 | regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; |
e85b24b5 OG |
153 | |
154 | if (unsol_sz < edtl) { | |
155 | hdr->flags |= ISER_WSV; | |
156 | hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey); | |
157 | hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz); | |
158 | ||
159 | iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X " | |
160 | "VA:%#llX + unsol:%d\n", | |
2261ec3d | 161 | task->itt, regd_buf->reg.rkey, |
e85b24b5 OG |
162 | (unsigned long long)regd_buf->reg.va, unsol_sz); |
163 | } | |
164 | ||
165 | if (imm_sz > 0) { | |
166 | iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", | |
2261ec3d | 167 | task->itt, imm_sz); |
e85b24b5 OG |
168 | iser_dto_add_regd_buff(send_dto, |
169 | regd_buf, | |
170 | 0, | |
171 | imm_sz); | |
172 | } | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | /** | |
178 | * iser_post_receive_control - allocates, initializes and posts receive DTO. | |
179 | */ | |
180 | static int iser_post_receive_control(struct iscsi_conn *conn) | |
181 | { | |
182 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
183 | struct iser_desc *rx_desc; | |
184 | struct iser_regd_buf *regd_hdr; | |
185 | struct iser_regd_buf *regd_data; | |
186 | struct iser_dto *recv_dto = NULL; | |
187 | struct iser_device *device = iser_conn->ib_conn->device; | |
188 | int rx_data_size, err = 0; | |
189 | ||
190 | rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); | |
191 | if (rx_desc == NULL) { | |
192 | iser_err("Failed to alloc desc for post recv\n"); | |
193 | return -ENOMEM; | |
194 | } | |
195 | rx_desc->type = ISCSI_RX; | |
196 | ||
197 | /* for the login sequence we must support rx of upto 8K; login is done | |
198 | * after conn create/bind (connect) and conn stop/bind (reconnect), | |
199 | * what's common for both schemes is that the connection is not started | |
200 | */ | |
201 | if (conn->c_stage != ISCSI_CONN_STARTED) | |
bf32ed33 | 202 | rx_data_size = ISCSI_DEF_MAX_RECV_SEG_LEN; |
e85b24b5 OG |
203 | else /* FIXME till user space sets conn->max_recv_dlength correctly */ |
204 | rx_data_size = 128; | |
205 | ||
206 | rx_desc->data = kmalloc(rx_data_size, GFP_NOIO); | |
207 | if (rx_desc->data == NULL) { | |
208 | iser_err("Failed to alloc data buf for post recv\n"); | |
209 | err = -ENOMEM; | |
210 | goto post_rx_kmalloc_failure; | |
211 | } | |
212 | ||
213 | recv_dto = &rx_desc->dto; | |
87e8df7a | 214 | recv_dto->ib_conn = iser_conn->ib_conn; |
e85b24b5 OG |
215 | recv_dto->regd_vector_len = 0; |
216 | ||
217 | regd_hdr = &rx_desc->hdr_regd_buf; | |
218 | memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); | |
219 | regd_hdr->device = device; | |
220 | regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */ | |
221 | regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; | |
222 | ||
223 | iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE); | |
224 | ||
225 | iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0); | |
226 | ||
227 | regd_data = &rx_desc->data_regd_buf; | |
228 | memset(regd_data, 0, sizeof(struct iser_regd_buf)); | |
229 | regd_data->device = device; | |
230 | regd_data->virt_addr = rx_desc->data; | |
231 | regd_data->data_size = rx_data_size; | |
232 | ||
233 | iser_reg_single(device, regd_data, DMA_FROM_DEVICE); | |
234 | ||
235 | iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0); | |
236 | ||
237 | err = iser_post_recv(rx_desc); | |
238 | if (!err) | |
239 | return 0; | |
240 | ||
241 | /* iser_post_recv failed */ | |
242 | iser_dto_buffs_release(recv_dto); | |
243 | kfree(rx_desc->data); | |
244 | post_rx_kmalloc_failure: | |
245 | kmem_cache_free(ig.desc_cache, rx_desc); | |
246 | return err; | |
247 | } | |
248 | ||
249 | /* creates a new tx descriptor and adds header regd buffer */ | |
250 | static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn, | |
251 | struct iser_desc *tx_desc) | |
252 | { | |
253 | struct iser_regd_buf *regd_hdr = &tx_desc->hdr_regd_buf; | |
254 | struct iser_dto *send_dto = &tx_desc->dto; | |
255 | ||
256 | memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); | |
257 | regd_hdr->device = iser_conn->ib_conn->device; | |
258 | regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */ | |
259 | regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; | |
260 | ||
87e8df7a | 261 | send_dto->ib_conn = iser_conn->ib_conn; |
e85b24b5 OG |
262 | send_dto->notify_enable = 1; |
263 | send_dto->regd_vector_len = 0; | |
264 | ||
265 | memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); | |
266 | tx_desc->iser_header.flags = ISER_VER; | |
267 | ||
268 | iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0); | |
269 | } | |
270 | ||
271 | /** | |
272 | * iser_conn_set_full_featured_mode - (iSER API) | |
273 | */ | |
274 | int iser_conn_set_full_featured_mode(struct iscsi_conn *conn) | |
275 | { | |
276 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
277 | ||
278 | int i; | |
279 | /* no need to keep it in a var, we are after login so if this should | |
280 | * be negotiated, by now the result should be available here */ | |
281 | int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS; | |
282 | ||
283 | iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num); | |
284 | ||
285 | /* Check that there is no posted recv or send buffers left - */ | |
286 | /* they must be consumed during the login phase */ | |
287 | BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0); | |
288 | BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0); | |
289 | ||
290 | /* Initial post receive buffers */ | |
291 | for (i = 0; i < initial_post_recv_bufs_num; i++) { | |
292 | if (iser_post_receive_control(conn) != 0) { | |
293 | iser_err("Failed to post recv bufs at:%d conn:0x%p\n", | |
294 | i, conn); | |
295 | return -ENOMEM; | |
296 | } | |
297 | } | |
298 | iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static int | |
2261ec3d | 303 | iser_check_xmit(struct iscsi_conn *conn, void *task) |
e85b24b5 | 304 | { |
e85b24b5 OG |
305 | struct iscsi_iser_conn *iser_conn = conn->dd_data; |
306 | ||
e85b24b5 OG |
307 | if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == |
308 | ISER_QP_MAX_REQ_DTOS) { | |
2261ec3d | 309 | iser_dbg("%ld can't xmit task %p\n",jiffies,task); |
f0938401 | 310 | return -ENOBUFS; |
e85b24b5 | 311 | } |
f0938401 | 312 | return 0; |
e85b24b5 OG |
313 | } |
314 | ||
315 | ||
316 | /** | |
317 | * iser_send_command - send command PDU | |
318 | */ | |
2747fdb2 | 319 | int iser_send_command(struct iscsi_conn *conn, |
2261ec3d | 320 | struct iscsi_task *task) |
e85b24b5 OG |
321 | { |
322 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
2261ec3d | 323 | struct iscsi_iser_task *iser_task = task->dd_data; |
e85b24b5 OG |
324 | struct iser_dto *send_dto = NULL; |
325 | unsigned long edtl; | |
326 | int err = 0; | |
327 | struct iser_data_buf *data_buf; | |
328 | ||
2261ec3d MC |
329 | struct iscsi_cmd *hdr = task->hdr; |
330 | struct scsi_cmnd *sc = task->sc; | |
e85b24b5 OG |
331 | |
332 | if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { | |
333 | iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); | |
334 | return -EPERM; | |
335 | } | |
2261ec3d | 336 | if (iser_check_xmit(conn, task)) |
f0938401 | 337 | return -ENOBUFS; |
e85b24b5 OG |
338 | |
339 | edtl = ntohl(hdr->data_length); | |
340 | ||
341 | /* build the tx desc regd header and add it to the tx desc dto */ | |
2261ec3d MC |
342 | iser_task->desc.type = ISCSI_TX_SCSI_COMMAND; |
343 | send_dto = &iser_task->desc.dto; | |
344 | send_dto->task = iser_task; | |
345 | iser_create_send_desc(iser_conn, &iser_task->desc); | |
e85b24b5 OG |
346 | |
347 | if (hdr->flags & ISCSI_FLAG_CMD_READ) | |
2261ec3d | 348 | data_buf = &iser_task->data[ISER_DIR_IN]; |
e85b24b5 | 349 | else |
2261ec3d | 350 | data_buf = &iser_task->data[ISER_DIR_OUT]; |
e85b24b5 | 351 | |
da9c0c77 FT |
352 | if (scsi_sg_count(sc)) { /* using a scatter list */ |
353 | data_buf->buf = scsi_sglist(sc); | |
354 | data_buf->size = scsi_sg_count(sc); | |
e85b24b5 OG |
355 | } |
356 | ||
da9c0c77 | 357 | data_buf->data_len = scsi_bufflen(sc); |
e85b24b5 OG |
358 | |
359 | if (hdr->flags & ISCSI_FLAG_CMD_READ) { | |
2261ec3d | 360 | err = iser_prepare_read_cmd(task, edtl); |
e85b24b5 OG |
361 | if (err) |
362 | goto send_command_error; | |
363 | } | |
364 | if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { | |
2261ec3d MC |
365 | err = iser_prepare_write_cmd(task, |
366 | task->imm_count, | |
367 | task->imm_count + | |
368 | task->unsol_count, | |
e85b24b5 OG |
369 | edtl); |
370 | if (err) | |
371 | goto send_command_error; | |
372 | } | |
373 | ||
374 | iser_reg_single(iser_conn->ib_conn->device, | |
375 | send_dto->regd[0], DMA_TO_DEVICE); | |
376 | ||
377 | if (iser_post_receive_control(conn) != 0) { | |
378 | iser_err("post_recv failed!\n"); | |
379 | err = -ENOMEM; | |
380 | goto send_command_error; | |
381 | } | |
382 | ||
2261ec3d | 383 | iser_task->status = ISER_TASK_STATUS_STARTED; |
e85b24b5 | 384 | |
2261ec3d | 385 | err = iser_post_send(&iser_task->desc); |
e85b24b5 OG |
386 | if (!err) |
387 | return 0; | |
388 | ||
389 | send_command_error: | |
390 | iser_dto_buffs_release(send_dto); | |
2261ec3d | 391 | iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); |
e85b24b5 OG |
392 | return err; |
393 | } | |
394 | ||
395 | /** | |
396 | * iser_send_data_out - send data out PDU | |
397 | */ | |
2747fdb2 | 398 | int iser_send_data_out(struct iscsi_conn *conn, |
2261ec3d | 399 | struct iscsi_task *task, |
e85b24b5 OG |
400 | struct iscsi_data *hdr) |
401 | { | |
402 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
2261ec3d | 403 | struct iscsi_iser_task *iser_task = task->dd_data; |
e85b24b5 OG |
404 | struct iser_desc *tx_desc = NULL; |
405 | struct iser_dto *send_dto = NULL; | |
406 | unsigned long buf_offset; | |
407 | unsigned long data_seg_len; | |
0a22ab92 | 408 | uint32_t itt; |
e85b24b5 OG |
409 | int err = 0; |
410 | ||
411 | if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { | |
412 | iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); | |
413 | return -EPERM; | |
414 | } | |
415 | ||
2261ec3d | 416 | if (iser_check_xmit(conn, task)) |
f0938401 | 417 | return -ENOBUFS; |
e85b24b5 | 418 | |
0a22ab92 | 419 | itt = (__force uint32_t)hdr->itt; |
e85b24b5 OG |
420 | data_seg_len = ntoh24(hdr->dlength); |
421 | buf_offset = ntohl(hdr->offset); | |
422 | ||
423 | iser_dbg("%s itt %d dseg_len %d offset %d\n", | |
424 | __func__,(int)itt,(int)data_seg_len,(int)buf_offset); | |
425 | ||
426 | tx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); | |
427 | if (tx_desc == NULL) { | |
428 | iser_err("Failed to alloc desc for post dataout\n"); | |
429 | return -ENOMEM; | |
430 | } | |
431 | ||
432 | tx_desc->type = ISCSI_TX_DATAOUT; | |
433 | memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); | |
434 | ||
435 | /* build the tx desc regd header and add it to the tx desc dto */ | |
436 | send_dto = &tx_desc->dto; | |
2261ec3d | 437 | send_dto->task = iser_task; |
e85b24b5 OG |
438 | iser_create_send_desc(iser_conn, tx_desc); |
439 | ||
440 | iser_reg_single(iser_conn->ib_conn->device, | |
441 | send_dto->regd[0], DMA_TO_DEVICE); | |
442 | ||
443 | /* all data was registered for RDMA, we can use the lkey */ | |
444 | iser_dto_add_regd_buff(send_dto, | |
2261ec3d | 445 | &iser_task->rdma_regd[ISER_DIR_OUT], |
e85b24b5 OG |
446 | buf_offset, |
447 | data_seg_len); | |
448 | ||
2261ec3d | 449 | if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { |
e85b24b5 OG |
450 | iser_err("Offset:%ld & DSL:%ld in Data-Out " |
451 | "inconsistent with total len:%ld, itt:%d\n", | |
452 | buf_offset, data_seg_len, | |
2261ec3d | 453 | iser_task->data[ISER_DIR_OUT].data_len, itt); |
e85b24b5 OG |
454 | err = -EINVAL; |
455 | goto send_data_out_error; | |
456 | } | |
457 | iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", | |
458 | itt, buf_offset, data_seg_len); | |
459 | ||
460 | ||
461 | err = iser_post_send(tx_desc); | |
462 | if (!err) | |
463 | return 0; | |
464 | ||
465 | send_data_out_error: | |
466 | iser_dto_buffs_release(send_dto); | |
467 | kmem_cache_free(ig.desc_cache, tx_desc); | |
468 | iser_err("conn %p failed err %d\n",conn, err); | |
469 | return err; | |
470 | } | |
471 | ||
472 | int iser_send_control(struct iscsi_conn *conn, | |
2261ec3d | 473 | struct iscsi_task *task) |
e85b24b5 OG |
474 | { |
475 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
2261ec3d MC |
476 | struct iscsi_iser_task *iser_task = task->dd_data; |
477 | struct iser_desc *mdesc = &iser_task->desc; | |
e85b24b5 | 478 | struct iser_dto *send_dto = NULL; |
e85b24b5 OG |
479 | unsigned long data_seg_len; |
480 | int err = 0; | |
e85b24b5 OG |
481 | struct iser_regd_buf *regd_buf; |
482 | struct iser_device *device; | |
483 | ||
484 | if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { | |
485 | iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); | |
486 | return -EPERM; | |
487 | } | |
488 | ||
2261ec3d | 489 | if (iser_check_xmit(conn, task)) |
f0938401 | 490 | return -ENOBUFS; |
e85b24b5 OG |
491 | |
492 | /* build the tx desc regd header and add it to the tx desc dto */ | |
493 | mdesc->type = ISCSI_TX_CONTROL; | |
494 | send_dto = &mdesc->dto; | |
2261ec3d | 495 | send_dto->task = NULL; |
e85b24b5 OG |
496 | iser_create_send_desc(iser_conn, mdesc); |
497 | ||
498 | device = iser_conn->ib_conn->device; | |
499 | ||
500 | iser_reg_single(device, send_dto->regd[0], DMA_TO_DEVICE); | |
501 | ||
2261ec3d | 502 | data_seg_len = ntoh24(task->hdr->dlength); |
e85b24b5 OG |
503 | |
504 | if (data_seg_len > 0) { | |
505 | regd_buf = &mdesc->data_regd_buf; | |
506 | memset(regd_buf, 0, sizeof(struct iser_regd_buf)); | |
507 | regd_buf->device = device; | |
2261ec3d MC |
508 | regd_buf->virt_addr = task->data; |
509 | regd_buf->data_size = task->data_count; | |
e85b24b5 OG |
510 | iser_reg_single(device, regd_buf, |
511 | DMA_TO_DEVICE); | |
512 | iser_dto_add_regd_buff(send_dto, regd_buf, | |
513 | 0, | |
514 | data_seg_len); | |
515 | } | |
516 | ||
517 | if (iser_post_receive_control(conn) != 0) { | |
518 | iser_err("post_rcv_buff failed!\n"); | |
519 | err = -ENOMEM; | |
520 | goto send_control_error; | |
521 | } | |
522 | ||
523 | err = iser_post_send(mdesc); | |
524 | if (!err) | |
525 | return 0; | |
526 | ||
527 | send_control_error: | |
528 | iser_dto_buffs_release(send_dto); | |
529 | iser_err("conn %p failed err %d\n",conn, err); | |
530 | return err; | |
531 | } | |
532 | ||
533 | /** | |
534 | * iser_rcv_dto_completion - recv DTO completion | |
535 | */ | |
536 | void iser_rcv_completion(struct iser_desc *rx_desc, | |
537 | unsigned long dto_xfer_len) | |
538 | { | |
2747fdb2 | 539 | struct iser_dto *dto = &rx_desc->dto; |
87e8df7a | 540 | struct iscsi_iser_conn *conn = dto->ib_conn->iser_conn; |
2261ec3d MC |
541 | struct iscsi_task *task; |
542 | struct iscsi_iser_task *iser_task; | |
e85b24b5 OG |
543 | struct iscsi_hdr *hdr; |
544 | char *rx_data = NULL; | |
545 | int rx_data_len = 0; | |
e85b24b5 OG |
546 | unsigned char opcode; |
547 | ||
548 | hdr = &rx_desc->iscsi_header; | |
549 | ||
550 | iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt); | |
551 | ||
552 | if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */ | |
553 | rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN; | |
554 | rx_data = dto->regd[1]->virt_addr; | |
555 | rx_data += dto->offset[1]; | |
556 | } | |
557 | ||
558 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; | |
559 | ||
560 | if (opcode == ISCSI_OP_SCSI_CMD_RSP) { | |
913e5bf4 | 561 | spin_lock(&conn->iscsi_conn->session->lock); |
2261ec3d | 562 | task = iscsi_itt_to_ctask(conn->iscsi_conn, hdr->itt); |
913e5bf4 MC |
563 | if (task) |
564 | __iscsi_get_task(task); | |
565 | spin_unlock(&conn->iscsi_conn->session->lock); | |
566 | ||
2261ec3d MC |
567 | if (!task) |
568 | iser_err("itt can't be matched to task!!! " | |
0af967f5 MC |
569 | "conn %p opcode %d itt %d\n", |
570 | conn->iscsi_conn, opcode, hdr->itt); | |
571 | else { | |
2261ec3d MC |
572 | iser_task = task->dd_data; |
573 | iser_dbg("itt %d task %p\n",hdr->itt, task); | |
574 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
575 | iser_task_rdma_finalize(iser_task); | |
913e5bf4 | 576 | iscsi_put_task(task); |
0af967f5 | 577 | } |
e85b24b5 | 578 | } |
e85b24b5 OG |
579 | iser_dto_buffs_release(dto); |
580 | ||
581 | iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len); | |
582 | ||
583 | kfree(rx_desc->data); | |
584 | kmem_cache_free(ig.desc_cache, rx_desc); | |
585 | ||
586 | /* decrementing conn->post_recv_buf_count only --after-- freeing the * | |
2261ec3d | 587 | * task eliminates the need to worry on tasks which are completed in * |
e85b24b5 OG |
588 | * parallel to the execution of iser_conn_term. So the code that waits * |
589 | * for the posted rx bufs refcount to become zero handles everything */ | |
590 | atomic_dec(&conn->ib_conn->post_recv_buf_count); | |
591 | } | |
592 | ||
593 | void iser_snd_completion(struct iser_desc *tx_desc) | |
594 | { | |
595 | struct iser_dto *dto = &tx_desc->dto; | |
87e8df7a EZ |
596 | struct iser_conn *ib_conn = dto->ib_conn; |
597 | struct iscsi_iser_conn *iser_conn = ib_conn->iser_conn; | |
e85b24b5 | 598 | struct iscsi_conn *conn = iser_conn->iscsi_conn; |
2261ec3d | 599 | struct iscsi_task *task; |
f0938401 | 600 | int resume_tx = 0; |
e85b24b5 OG |
601 | |
602 | iser_dbg("Initiator, Data sent dto=0x%p\n", dto); | |
603 | ||
604 | iser_dto_buffs_release(dto); | |
605 | ||
606 | if (tx_desc->type == ISCSI_TX_DATAOUT) | |
607 | kmem_cache_free(ig.desc_cache, tx_desc); | |
608 | ||
f0938401 EZ |
609 | if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == |
610 | ISER_QP_MAX_REQ_DTOS) | |
611 | resume_tx = 1; | |
612 | ||
87e8df7a | 613 | atomic_dec(&ib_conn->post_send_buf_count); |
e85b24b5 | 614 | |
f0938401 | 615 | if (resume_tx) { |
e85b24b5 | 616 | iser_dbg("%ld resuming tx\n",jiffies); |
e85b24b5 OG |
617 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
618 | } | |
e85b24b5 OG |
619 | |
620 | if (tx_desc->type == ISCSI_TX_CONTROL) { | |
621 | /* this arithmetic is legal by libiscsi dd_data allocation */ | |
2261ec3d MC |
622 | task = (void *) ((long)(void *)tx_desc - |
623 | sizeof(struct iscsi_task)); | |
624 | if (task->hdr->itt == RESERVED_ITT) | |
625 | iscsi_put_task(task); | |
e85b24b5 OG |
626 | } |
627 | } | |
628 | ||
2261ec3d | 629 | void iser_task_rdma_init(struct iscsi_iser_task *iser_task) |
e85b24b5 OG |
630 | |
631 | { | |
2261ec3d | 632 | iser_task->status = ISER_TASK_STATUS_INIT; |
e85b24b5 | 633 | |
2261ec3d MC |
634 | iser_task->dir[ISER_DIR_IN] = 0; |
635 | iser_task->dir[ISER_DIR_OUT] = 0; | |
e85b24b5 | 636 | |
2261ec3d MC |
637 | iser_task->data[ISER_DIR_IN].data_len = 0; |
638 | iser_task->data[ISER_DIR_OUT].data_len = 0; | |
e85b24b5 | 639 | |
2261ec3d | 640 | memset(&iser_task->rdma_regd[ISER_DIR_IN], 0, |
e85b24b5 | 641 | sizeof(struct iser_regd_buf)); |
2261ec3d | 642 | memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0, |
e85b24b5 OG |
643 | sizeof(struct iser_regd_buf)); |
644 | } | |
645 | ||
2261ec3d | 646 | void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) |
e85b24b5 OG |
647 | { |
648 | int deferred; | |
74a20780 | 649 | int is_rdma_aligned = 1; |
3104a217 | 650 | struct iser_regd_buf *regd; |
e85b24b5 OG |
651 | |
652 | /* if we were reading, copy back to unaligned sglist, | |
653 | * anyway dma_unmap and free the copy | |
654 | */ | |
2261ec3d | 655 | if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) { |
74a20780 | 656 | is_rdma_aligned = 0; |
2261ec3d | 657 | iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN); |
74a20780 | 658 | } |
2261ec3d | 659 | if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) { |
74a20780 | 660 | is_rdma_aligned = 0; |
2261ec3d | 661 | iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT); |
74a20780 | 662 | } |
e85b24b5 | 663 | |
2261ec3d MC |
664 | if (iser_task->dir[ISER_DIR_IN]) { |
665 | regd = &iser_task->rdma_regd[ISER_DIR_IN]; | |
3104a217 | 666 | deferred = iser_regd_buff_release(regd); |
e85b24b5 | 667 | if (deferred) { |
3104a217 EZ |
668 | iser_err("%d references remain for BUF-IN rdma reg\n", |
669 | atomic_read(®d->ref_count)); | |
e85b24b5 OG |
670 | } |
671 | } | |
672 | ||
2261ec3d MC |
673 | if (iser_task->dir[ISER_DIR_OUT]) { |
674 | regd = &iser_task->rdma_regd[ISER_DIR_OUT]; | |
3104a217 | 675 | deferred = iser_regd_buff_release(regd); |
e85b24b5 | 676 | if (deferred) { |
3104a217 EZ |
677 | iser_err("%d references remain for BUF-OUT rdma reg\n", |
678 | atomic_read(®d->ref_count)); | |
e85b24b5 OG |
679 | } |
680 | } | |
681 | ||
74a20780 EZ |
682 | /* if the data was unaligned, it was already unmapped and then copied */ |
683 | if (is_rdma_aligned) | |
2261ec3d | 684 | iser_dma_unmap_task_data(iser_task); |
e85b24b5 OG |
685 | } |
686 | ||
687 | void iser_dto_buffs_release(struct iser_dto *dto) | |
688 | { | |
689 | int i; | |
690 | ||
691 | for (i = 0; i < dto->regd_vector_len; i++) | |
692 | iser_regd_buff_release(dto->regd[i]); | |
693 | } | |
694 |