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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. | |
e85b24b5 OG |
31 | */ |
32 | #include <linux/kernel.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/mm.h> | |
e85b24b5 OG |
35 | #include <linux/scatterlist.h> |
36 | #include <linux/kfifo.h> | |
37 | #include <scsi/scsi_cmnd.h> | |
38 | #include <scsi/scsi_host.h> | |
39 | ||
40 | #include "iscsi_iser.h" | |
41 | ||
e85b24b5 OG |
42 | /* Register user buffer memory and initialize passive rdma |
43 | * dto descriptor. Total data size is stored in | |
2261ec3d | 44 | * iser_task->data[ISER_DIR_IN].data_len |
e85b24b5 | 45 | */ |
2261ec3d | 46 | static int iser_prepare_read_cmd(struct iscsi_task *task, |
e85b24b5 OG |
47 | unsigned int edtl) |
48 | ||
49 | { | |
2261ec3d | 50 | struct iscsi_iser_task *iser_task = task->dd_data; |
e85b24b5 OG |
51 | struct iser_regd_buf *regd_buf; |
52 | int err; | |
2261ec3d MC |
53 | struct iser_hdr *hdr = &iser_task->desc.iser_header; |
54 | struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN]; | |
e85b24b5 | 55 | |
2261ec3d | 56 | err = iser_dma_map_task_data(iser_task, |
e85b24b5 OG |
57 | buf_in, |
58 | ISER_DIR_IN, | |
59 | DMA_FROM_DEVICE); | |
60 | if (err) | |
61 | return err; | |
62 | ||
2261ec3d | 63 | if (edtl > iser_task->data[ISER_DIR_IN].data_len) { |
e85b24b5 OG |
64 | iser_err("Total data length: %ld, less than EDTL: " |
65 | "%d, in READ cmd BHS itt: %d, conn: 0x%p\n", | |
2261ec3d MC |
66 | iser_task->data[ISER_DIR_IN].data_len, edtl, |
67 | task->itt, iser_task->iser_conn); | |
e85b24b5 OG |
68 | return -EINVAL; |
69 | } | |
70 | ||
2261ec3d | 71 | err = iser_reg_rdma_mem(iser_task,ISER_DIR_IN); |
e85b24b5 OG |
72 | if (err) { |
73 | iser_err("Failed to set up Data-IN RDMA\n"); | |
74 | return err; | |
75 | } | |
2261ec3d | 76 | regd_buf = &iser_task->rdma_regd[ISER_DIR_IN]; |
e85b24b5 OG |
77 | |
78 | hdr->flags |= ISER_RSV; | |
79 | hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey); | |
80 | hdr->read_va = cpu_to_be64(regd_buf->reg.va); | |
81 | ||
82 | iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", | |
2261ec3d | 83 | task->itt, regd_buf->reg.rkey, |
e85b24b5 OG |
84 | (unsigned long long)regd_buf->reg.va); |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | /* Register user buffer memory and initialize passive rdma | |
90 | * dto descriptor. Total data size is stored in | |
2261ec3d | 91 | * task->data[ISER_DIR_OUT].data_len |
e85b24b5 OG |
92 | */ |
93 | static int | |
2261ec3d | 94 | iser_prepare_write_cmd(struct iscsi_task *task, |
e85b24b5 OG |
95 | unsigned int imm_sz, |
96 | unsigned int unsol_sz, | |
97 | unsigned int edtl) | |
98 | { | |
2261ec3d | 99 | struct iscsi_iser_task *iser_task = task->dd_data; |
e85b24b5 OG |
100 | struct iser_regd_buf *regd_buf; |
101 | int err; | |
2261ec3d MC |
102 | struct iser_hdr *hdr = &iser_task->desc.iser_header; |
103 | struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT]; | |
f19624aa | 104 | struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1]; |
e85b24b5 | 105 | |
2261ec3d | 106 | err = iser_dma_map_task_data(iser_task, |
e85b24b5 OG |
107 | buf_out, |
108 | ISER_DIR_OUT, | |
109 | DMA_TO_DEVICE); | |
110 | if (err) | |
111 | return err; | |
112 | ||
2261ec3d | 113 | if (edtl > iser_task->data[ISER_DIR_OUT].data_len) { |
e85b24b5 OG |
114 | iser_err("Total data length: %ld, less than EDTL: %d, " |
115 | "in WRITE cmd BHS itt: %d, conn: 0x%p\n", | |
2261ec3d MC |
116 | iser_task->data[ISER_DIR_OUT].data_len, |
117 | edtl, task->itt, task->conn); | |
e85b24b5 OG |
118 | return -EINVAL; |
119 | } | |
120 | ||
2261ec3d | 121 | err = iser_reg_rdma_mem(iser_task,ISER_DIR_OUT); |
e85b24b5 OG |
122 | if (err != 0) { |
123 | iser_err("Failed to register write cmd RDMA mem\n"); | |
124 | return err; | |
125 | } | |
126 | ||
2261ec3d | 127 | regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; |
e85b24b5 OG |
128 | |
129 | if (unsol_sz < edtl) { | |
130 | hdr->flags |= ISER_WSV; | |
131 | hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey); | |
132 | hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz); | |
133 | ||
134 | iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X " | |
135 | "VA:%#llX + unsol:%d\n", | |
2261ec3d | 136 | task->itt, regd_buf->reg.rkey, |
e85b24b5 OG |
137 | (unsigned long long)regd_buf->reg.va, unsol_sz); |
138 | } | |
139 | ||
140 | if (imm_sz > 0) { | |
141 | iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", | |
2261ec3d | 142 | task->itt, imm_sz); |
f19624aa OG |
143 | tx_dsg->addr = regd_buf->reg.va; |
144 | tx_dsg->length = imm_sz; | |
145 | tx_dsg->lkey = regd_buf->reg.lkey; | |
146 | iser_task->desc.num_sge = 2; | |
e85b24b5 OG |
147 | } |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
e85b24b5 | 152 | /* creates a new tx descriptor and adds header regd buffer */ |
f19624aa OG |
153 | static void iser_create_send_desc(struct iser_conn *ib_conn, |
154 | struct iser_tx_desc *tx_desc) | |
e85b24b5 | 155 | { |
f19624aa | 156 | struct iser_device *device = ib_conn->device; |
e85b24b5 | 157 | |
f19624aa OG |
158 | ib_dma_sync_single_for_cpu(device->ib_device, |
159 | tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
e85b24b5 OG |
160 | |
161 | memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); | |
162 | tx_desc->iser_header.flags = ISER_VER; | |
163 | ||
f19624aa OG |
164 | tx_desc->num_sge = 1; |
165 | ||
166 | if (tx_desc->tx_sg[0].lkey != device->mr->lkey) { | |
167 | tx_desc->tx_sg[0].lkey = device->mr->lkey; | |
168 | iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc); | |
169 | } | |
e85b24b5 OG |
170 | } |
171 | ||
f19624aa | 172 | |
bcc60c38 OG |
173 | int iser_alloc_rx_descriptors(struct iser_conn *ib_conn) |
174 | { | |
175 | int i, j; | |
176 | u64 dma_addr; | |
177 | struct iser_rx_desc *rx_desc; | |
178 | struct ib_sge *rx_sg; | |
179 | struct iser_device *device = ib_conn->device; | |
180 | ||
181 | ib_conn->rx_descs = kmalloc(ISER_QP_MAX_RECV_DTOS * | |
182 | sizeof(struct iser_rx_desc), GFP_KERNEL); | |
183 | if (!ib_conn->rx_descs) | |
184 | goto rx_desc_alloc_fail; | |
185 | ||
186 | rx_desc = ib_conn->rx_descs; | |
187 | ||
188 | for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++) { | |
189 | dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, | |
190 | ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); | |
191 | if (ib_dma_mapping_error(device->ib_device, dma_addr)) | |
192 | goto rx_desc_dma_map_failed; | |
193 | ||
194 | rx_desc->dma_addr = dma_addr; | |
195 | ||
196 | rx_sg = &rx_desc->rx_sg; | |
197 | rx_sg->addr = rx_desc->dma_addr; | |
198 | rx_sg->length = ISER_RX_PAYLOAD_SIZE; | |
199 | rx_sg->lkey = device->mr->lkey; | |
200 | } | |
201 | ||
202 | ib_conn->rx_desc_head = 0; | |
203 | return 0; | |
204 | ||
205 | rx_desc_dma_map_failed: | |
206 | rx_desc = ib_conn->rx_descs; | |
207 | for (j = 0; j < i; j++, rx_desc++) | |
208 | ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, | |
209 | ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); | |
210 | kfree(ib_conn->rx_descs); | |
211 | ib_conn->rx_descs = NULL; | |
212 | rx_desc_alloc_fail: | |
213 | iser_err("failed allocating rx descriptors / data buffers\n"); | |
214 | return -ENOMEM; | |
215 | } | |
216 | ||
217 | void iser_free_rx_descriptors(struct iser_conn *ib_conn) | |
218 | { | |
219 | int i; | |
220 | struct iser_rx_desc *rx_desc; | |
221 | struct iser_device *device = ib_conn->device; | |
222 | ||
223 | if (ib_conn->login_buf) { | |
224 | ib_dma_unmap_single(device->ib_device, ib_conn->login_dma, | |
225 | ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); | |
226 | kfree(ib_conn->login_buf); | |
227 | } | |
228 | ||
229 | if (!ib_conn->rx_descs) | |
230 | return; | |
231 | ||
232 | rx_desc = ib_conn->rx_descs; | |
233 | for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++) | |
234 | ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, | |
235 | ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); | |
236 | kfree(ib_conn->rx_descs); | |
237 | } | |
238 | ||
e85b24b5 OG |
239 | /** |
240 | * iser_conn_set_full_featured_mode - (iSER API) | |
241 | */ | |
242 | int iser_conn_set_full_featured_mode(struct iscsi_conn *conn) | |
243 | { | |
244 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
245 | ||
bcc60c38 | 246 | iser_dbg("Initially post: %d\n", ISER_MIN_POSTED_RX); |
e85b24b5 OG |
247 | |
248 | /* Check that there is no posted recv or send buffers left - */ | |
249 | /* they must be consumed during the login phase */ | |
704315f0 | 250 | BUG_ON(iser_conn->ib_conn->post_recv_buf_count != 0); |
e85b24b5 OG |
251 | BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0); |
252 | ||
bcc60c38 OG |
253 | if (iser_alloc_rx_descriptors(iser_conn->ib_conn)) |
254 | return -ENOMEM; | |
255 | ||
e85b24b5 | 256 | /* Initial post receive buffers */ |
bcc60c38 OG |
257 | if (iser_post_recvm(iser_conn->ib_conn, ISER_MIN_POSTED_RX)) |
258 | return -ENOMEM; | |
259 | ||
e85b24b5 OG |
260 | return 0; |
261 | } | |
262 | ||
e85b24b5 OG |
263 | /** |
264 | * iser_send_command - send command PDU | |
265 | */ | |
2747fdb2 | 266 | int iser_send_command(struct iscsi_conn *conn, |
2261ec3d | 267 | struct iscsi_task *task) |
e85b24b5 OG |
268 | { |
269 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
2261ec3d | 270 | struct iscsi_iser_task *iser_task = task->dd_data; |
e85b24b5 | 271 | unsigned long edtl; |
bcc60c38 | 272 | int err; |
e85b24b5 | 273 | struct iser_data_buf *data_buf; |
0f9c7449 | 274 | struct iscsi_cmd *hdr = (struct iscsi_cmd *)task->hdr; |
2261ec3d | 275 | struct scsi_cmnd *sc = task->sc; |
f19624aa | 276 | struct iser_tx_desc *tx_desc = &iser_task->desc; |
e85b24b5 | 277 | |
e85b24b5 OG |
278 | edtl = ntohl(hdr->data_length); |
279 | ||
280 | /* build the tx desc regd header and add it to the tx desc dto */ | |
f19624aa OG |
281 | tx_desc->type = ISCSI_TX_SCSI_COMMAND; |
282 | iser_create_send_desc(iser_conn->ib_conn, tx_desc); | |
e85b24b5 OG |
283 | |
284 | if (hdr->flags & ISCSI_FLAG_CMD_READ) | |
2261ec3d | 285 | data_buf = &iser_task->data[ISER_DIR_IN]; |
e85b24b5 | 286 | else |
2261ec3d | 287 | data_buf = &iser_task->data[ISER_DIR_OUT]; |
e85b24b5 | 288 | |
da9c0c77 FT |
289 | if (scsi_sg_count(sc)) { /* using a scatter list */ |
290 | data_buf->buf = scsi_sglist(sc); | |
291 | data_buf->size = scsi_sg_count(sc); | |
e85b24b5 OG |
292 | } |
293 | ||
da9c0c77 | 294 | data_buf->data_len = scsi_bufflen(sc); |
e85b24b5 OG |
295 | |
296 | if (hdr->flags & ISCSI_FLAG_CMD_READ) { | |
2261ec3d | 297 | err = iser_prepare_read_cmd(task, edtl); |
e85b24b5 OG |
298 | if (err) |
299 | goto send_command_error; | |
300 | } | |
301 | if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { | |
2261ec3d MC |
302 | err = iser_prepare_write_cmd(task, |
303 | task->imm_count, | |
304 | task->imm_count + | |
0f9c7449 | 305 | task->unsol_r2t.data_length, |
e85b24b5 OG |
306 | edtl); |
307 | if (err) | |
308 | goto send_command_error; | |
309 | } | |
310 | ||
2261ec3d | 311 | iser_task->status = ISER_TASK_STATUS_STARTED; |
e85b24b5 | 312 | |
f19624aa | 313 | err = iser_post_send(iser_conn->ib_conn, tx_desc); |
e85b24b5 OG |
314 | if (!err) |
315 | return 0; | |
316 | ||
317 | send_command_error: | |
2261ec3d | 318 | iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); |
e85b24b5 OG |
319 | return err; |
320 | } | |
321 | ||
322 | /** | |
323 | * iser_send_data_out - send data out PDU | |
324 | */ | |
2747fdb2 | 325 | int iser_send_data_out(struct iscsi_conn *conn, |
2261ec3d | 326 | struct iscsi_task *task, |
e85b24b5 OG |
327 | struct iscsi_data *hdr) |
328 | { | |
329 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
2261ec3d | 330 | struct iscsi_iser_task *iser_task = task->dd_data; |
f19624aa OG |
331 | struct iser_tx_desc *tx_desc = NULL; |
332 | struct iser_regd_buf *regd_buf; | |
e85b24b5 OG |
333 | unsigned long buf_offset; |
334 | unsigned long data_seg_len; | |
0a22ab92 | 335 | uint32_t itt; |
e85b24b5 | 336 | int err = 0; |
f19624aa OG |
337 | struct ib_sge *tx_dsg; |
338 | ||
0a22ab92 | 339 | itt = (__force uint32_t)hdr->itt; |
e85b24b5 OG |
340 | data_seg_len = ntoh24(hdr->dlength); |
341 | buf_offset = ntohl(hdr->offset); | |
342 | ||
343 | iser_dbg("%s itt %d dseg_len %d offset %d\n", | |
344 | __func__,(int)itt,(int)data_seg_len,(int)buf_offset); | |
345 | ||
528f4e8c | 346 | tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); |
e85b24b5 OG |
347 | if (tx_desc == NULL) { |
348 | iser_err("Failed to alloc desc for post dataout\n"); | |
349 | return -ENOMEM; | |
350 | } | |
351 | ||
352 | tx_desc->type = ISCSI_TX_DATAOUT; | |
f19624aa | 353 | tx_desc->iser_header.flags = ISER_VER; |
e85b24b5 OG |
354 | memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); |
355 | ||
f19624aa OG |
356 | /* build the tx desc */ |
357 | iser_initialize_task_headers(task, tx_desc); | |
e85b24b5 | 358 | |
f19624aa OG |
359 | regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; |
360 | tx_dsg = &tx_desc->tx_sg[1]; | |
361 | tx_dsg->addr = regd_buf->reg.va + buf_offset; | |
362 | tx_dsg->length = data_seg_len; | |
363 | tx_dsg->lkey = regd_buf->reg.lkey; | |
364 | tx_desc->num_sge = 2; | |
e85b24b5 | 365 | |
2261ec3d | 366 | if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { |
e85b24b5 OG |
367 | iser_err("Offset:%ld & DSL:%ld in Data-Out " |
368 | "inconsistent with total len:%ld, itt:%d\n", | |
369 | buf_offset, data_seg_len, | |
2261ec3d | 370 | iser_task->data[ISER_DIR_OUT].data_len, itt); |
e85b24b5 OG |
371 | err = -EINVAL; |
372 | goto send_data_out_error; | |
373 | } | |
374 | iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", | |
375 | itt, buf_offset, data_seg_len); | |
376 | ||
377 | ||
f19624aa | 378 | err = iser_post_send(iser_conn->ib_conn, tx_desc); |
e85b24b5 OG |
379 | if (!err) |
380 | return 0; | |
381 | ||
382 | send_data_out_error: | |
e85b24b5 OG |
383 | kmem_cache_free(ig.desc_cache, tx_desc); |
384 | iser_err("conn %p failed err %d\n",conn, err); | |
385 | return err; | |
386 | } | |
387 | ||
388 | int iser_send_control(struct iscsi_conn *conn, | |
2261ec3d | 389 | struct iscsi_task *task) |
e85b24b5 OG |
390 | { |
391 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
2261ec3d | 392 | struct iscsi_iser_task *iser_task = task->dd_data; |
f19624aa | 393 | struct iser_tx_desc *mdesc = &iser_task->desc; |
e85b24b5 | 394 | unsigned long data_seg_len; |
f19624aa | 395 | int err = 0; |
e85b24b5 OG |
396 | struct iser_device *device; |
397 | ||
e85b24b5 OG |
398 | /* build the tx desc regd header and add it to the tx desc dto */ |
399 | mdesc->type = ISCSI_TX_CONTROL; | |
f19624aa | 400 | iser_create_send_desc(iser_conn->ib_conn, mdesc); |
e85b24b5 OG |
401 | |
402 | device = iser_conn->ib_conn->device; | |
403 | ||
2261ec3d | 404 | data_seg_len = ntoh24(task->hdr->dlength); |
e85b24b5 OG |
405 | |
406 | if (data_seg_len > 0) { | |
f19624aa OG |
407 | struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; |
408 | if (task != conn->login_task) { | |
409 | iser_err("data present on non login task!!!\n"); | |
410 | goto send_control_error; | |
411 | } | |
412 | memcpy(iser_conn->ib_conn->login_buf, task->data, | |
413 | task->data_count); | |
414 | tx_dsg->addr = iser_conn->ib_conn->login_dma; | |
415 | tx_dsg->length = data_seg_len; | |
416 | tx_dsg->lkey = device->mr->lkey; | |
417 | mdesc->num_sge = 2; | |
e85b24b5 OG |
418 | } |
419 | ||
bcc60c38 OG |
420 | if (task == conn->login_task) { |
421 | err = iser_post_recvl(iser_conn->ib_conn); | |
422 | if (err) | |
423 | goto send_control_error; | |
e85b24b5 OG |
424 | } |
425 | ||
f19624aa | 426 | err = iser_post_send(iser_conn->ib_conn, mdesc); |
e85b24b5 OG |
427 | if (!err) |
428 | return 0; | |
429 | ||
430 | send_control_error: | |
e85b24b5 OG |
431 | iser_err("conn %p failed err %d\n",conn, err); |
432 | return err; | |
433 | } | |
434 | ||
435 | /** | |
436 | * iser_rcv_dto_completion - recv DTO completion | |
437 | */ | |
bcc60c38 OG |
438 | void iser_rcv_completion(struct iser_rx_desc *rx_desc, |
439 | unsigned long rx_xfer_len, | |
440 | struct iser_conn *ib_conn) | |
e85b24b5 | 441 | { |
bcc60c38 | 442 | struct iscsi_iser_conn *conn = ib_conn->iser_conn; |
2261ec3d MC |
443 | struct iscsi_task *task; |
444 | struct iscsi_iser_task *iser_task; | |
e85b24b5 | 445 | struct iscsi_hdr *hdr; |
e85b24b5 | 446 | unsigned char opcode; |
bcc60c38 OG |
447 | u64 rx_dma; |
448 | int rx_buflen, outstanding, count, err; | |
449 | ||
450 | /* differentiate between login to all other PDUs */ | |
451 | if ((char *)rx_desc == ib_conn->login_buf) { | |
452 | rx_dma = ib_conn->login_dma; | |
453 | rx_buflen = ISER_RX_LOGIN_SIZE; | |
454 | } else { | |
455 | rx_dma = rx_desc->dma_addr; | |
456 | rx_buflen = ISER_RX_PAYLOAD_SIZE; | |
457 | } | |
e85b24b5 | 458 | |
bcc60c38 OG |
459 | ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma, |
460 | rx_buflen, DMA_FROM_DEVICE); | |
e85b24b5 | 461 | |
bcc60c38 | 462 | hdr = &rx_desc->iscsi_header; |
e85b24b5 | 463 | |
bcc60c38 OG |
464 | iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, |
465 | hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN)); | |
e85b24b5 OG |
466 | |
467 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; | |
468 | ||
469 | if (opcode == ISCSI_OP_SCSI_CMD_RSP) { | |
913e5bf4 | 470 | spin_lock(&conn->iscsi_conn->session->lock); |
2261ec3d | 471 | task = iscsi_itt_to_ctask(conn->iscsi_conn, hdr->itt); |
913e5bf4 MC |
472 | if (task) |
473 | __iscsi_get_task(task); | |
474 | spin_unlock(&conn->iscsi_conn->session->lock); | |
475 | ||
2261ec3d | 476 | if (!task) |
908cf9a5 | 477 | iser_err("itt can't be matched to task!!! " |
0af967f5 MC |
478 | "conn %p opcode %d itt %d\n", |
479 | conn->iscsi_conn, opcode, hdr->itt); | |
480 | else { | |
2261ec3d MC |
481 | iser_task = task->dd_data; |
482 | iser_dbg("itt %d task %p\n",hdr->itt, task); | |
483 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
484 | iser_task_rdma_finalize(iser_task); | |
913e5bf4 | 485 | iscsi_put_task(task); |
0af967f5 | 486 | } |
e85b24b5 | 487 | } |
e85b24b5 | 488 | |
bcc60c38 OG |
489 | iscsi_iser_recv(conn->iscsi_conn, hdr, |
490 | rx_desc->data, rx_xfer_len - ISER_HEADERS_LEN); | |
e85b24b5 | 491 | |
bcc60c38 OG |
492 | ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma, |
493 | rx_buflen, DMA_FROM_DEVICE); | |
e85b24b5 OG |
494 | |
495 | /* decrementing conn->post_recv_buf_count only --after-- freeing the * | |
496 | * task eliminates the need to worry on tasks which are completed in * | |
497 | * parallel to the execution of iser_conn_term. So the code that waits * | |
498 | * for the posted rx bufs refcount to become zero handles everything */ | |
704315f0 | 499 | conn->ib_conn->post_recv_buf_count--; |
bcc60c38 OG |
500 | |
501 | if (rx_dma == ib_conn->login_dma) | |
502 | return; | |
503 | ||
704315f0 | 504 | outstanding = ib_conn->post_recv_buf_count; |
bcc60c38 OG |
505 | if (outstanding + ISER_MIN_POSTED_RX <= ISER_QP_MAX_RECV_DTOS) { |
506 | count = min(ISER_QP_MAX_RECV_DTOS - outstanding, | |
507 | ISER_MIN_POSTED_RX); | |
508 | err = iser_post_recvm(ib_conn, count); | |
509 | if (err) | |
510 | iser_err("posting %d rx bufs err %d\n", count, err); | |
511 | } | |
e85b24b5 OG |
512 | } |
513 | ||
f19624aa OG |
514 | void iser_snd_completion(struct iser_tx_desc *tx_desc, |
515 | struct iser_conn *ib_conn) | |
e85b24b5 | 516 | { |
87e8df7a | 517 | struct iscsi_iser_conn *iser_conn = ib_conn->iser_conn; |
e85b24b5 | 518 | struct iscsi_conn *conn = iser_conn->iscsi_conn; |
2261ec3d | 519 | struct iscsi_task *task; |
f0938401 | 520 | int resume_tx = 0; |
f19624aa | 521 | struct iser_device *device = ib_conn->device; |
e85b24b5 | 522 | |
f19624aa OG |
523 | if (tx_desc->type == ISCSI_TX_DATAOUT) { |
524 | ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, | |
525 | ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
e85b24b5 | 526 | kmem_cache_free(ig.desc_cache, tx_desc); |
f19624aa | 527 | } |
e85b24b5 | 528 | |
f0938401 EZ |
529 | if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == |
530 | ISER_QP_MAX_REQ_DTOS) | |
531 | resume_tx = 1; | |
532 | ||
87e8df7a | 533 | atomic_dec(&ib_conn->post_send_buf_count); |
e85b24b5 | 534 | |
f0938401 | 535 | if (resume_tx) { |
e85b24b5 | 536 | iser_dbg("%ld resuming tx\n",jiffies); |
32ae763e | 537 | iscsi_conn_queue_work(conn); |
e85b24b5 | 538 | } |
e85b24b5 OG |
539 | |
540 | if (tx_desc->type == ISCSI_TX_CONTROL) { | |
541 | /* this arithmetic is legal by libiscsi dd_data allocation */ | |
2261ec3d MC |
542 | task = (void *) ((long)(void *)tx_desc - |
543 | sizeof(struct iscsi_task)); | |
544 | if (task->hdr->itt == RESERVED_ITT) | |
545 | iscsi_put_task(task); | |
e85b24b5 OG |
546 | } |
547 | } | |
548 | ||
2261ec3d | 549 | void iser_task_rdma_init(struct iscsi_iser_task *iser_task) |
e85b24b5 OG |
550 | |
551 | { | |
2261ec3d | 552 | iser_task->status = ISER_TASK_STATUS_INIT; |
e85b24b5 | 553 | |
2261ec3d MC |
554 | iser_task->dir[ISER_DIR_IN] = 0; |
555 | iser_task->dir[ISER_DIR_OUT] = 0; | |
e85b24b5 | 556 | |
2261ec3d MC |
557 | iser_task->data[ISER_DIR_IN].data_len = 0; |
558 | iser_task->data[ISER_DIR_OUT].data_len = 0; | |
e85b24b5 | 559 | |
2261ec3d | 560 | memset(&iser_task->rdma_regd[ISER_DIR_IN], 0, |
e85b24b5 | 561 | sizeof(struct iser_regd_buf)); |
2261ec3d | 562 | memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0, |
e85b24b5 OG |
563 | sizeof(struct iser_regd_buf)); |
564 | } | |
565 | ||
2261ec3d | 566 | void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) |
e85b24b5 | 567 | { |
74a20780 | 568 | int is_rdma_aligned = 1; |
3104a217 | 569 | struct iser_regd_buf *regd; |
e85b24b5 OG |
570 | |
571 | /* if we were reading, copy back to unaligned sglist, | |
572 | * anyway dma_unmap and free the copy | |
573 | */ | |
2261ec3d | 574 | if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) { |
74a20780 | 575 | is_rdma_aligned = 0; |
2261ec3d | 576 | iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN); |
74a20780 | 577 | } |
2261ec3d | 578 | if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) { |
74a20780 | 579 | is_rdma_aligned = 0; |
2261ec3d | 580 | iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT); |
74a20780 | 581 | } |
e85b24b5 | 582 | |
2261ec3d MC |
583 | if (iser_task->dir[ISER_DIR_IN]) { |
584 | regd = &iser_task->rdma_regd[ISER_DIR_IN]; | |
f19624aa OG |
585 | if (regd->reg.is_fmr) |
586 | iser_unreg_mem(®d->reg); | |
e85b24b5 OG |
587 | } |
588 | ||
2261ec3d MC |
589 | if (iser_task->dir[ISER_DIR_OUT]) { |
590 | regd = &iser_task->rdma_regd[ISER_DIR_OUT]; | |
f19624aa OG |
591 | if (regd->reg.is_fmr) |
592 | iser_unreg_mem(®d->reg); | |
e85b24b5 OG |
593 | } |
594 | ||
74a20780 EZ |
595 | /* if the data was unaligned, it was already unmapped and then copied */ |
596 | if (is_rdma_aligned) | |
2261ec3d | 597 | iser_dma_unmap_task_data(iser_task); |
e85b24b5 | 598 | } |