1 /*
2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33 #include <linux/kernel.h>
34 #include <linux/slab.h>
35 #include <linux/mm.h>
36 #include <linux/scatterlist.h>
37 #include <linux/kfifo.h>
38 #include <scsi/scsi_cmnd.h>
39 #include <scsi/scsi_host.h>
40
41 #include "iscsi_iser.h"
42
43 /* Register user buffer memory and initialize passive rdma
44 * dto descriptor. Data size is stored in
45 * task->data[ISER_DIR_IN].data_len, Protection size
46 * os stored in task->prot[ISER_DIR_IN].data_len
47 */
iser_prepare_read_cmd(struct iscsi_task * task)48 static int iser_prepare_read_cmd(struct iscsi_task *task)
49
50 {
51 struct iscsi_iser_task *iser_task = task->dd_data;
52 struct iser_mem_reg *mem_reg;
53 int err;
54 struct iser_ctrl *hdr = &iser_task->desc.iser_header;
55 struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN];
56
57 err = iser_dma_map_task_data(iser_task,
58 buf_in,
59 ISER_DIR_IN,
60 DMA_FROM_DEVICE);
61 if (err)
62 return err;
63
64 if (scsi_prot_sg_count(iser_task->sc)) {
65 struct iser_data_buf *pbuf_in = &iser_task->prot[ISER_DIR_IN];
66
67 err = iser_dma_map_task_data(iser_task,
68 pbuf_in,
69 ISER_DIR_IN,
70 DMA_FROM_DEVICE);
71 if (err)
72 return err;
73 }
74
75 err = iser_reg_mem_fastreg(iser_task, ISER_DIR_IN, false);
76 if (err) {
77 iser_err("Failed to set up Data-IN RDMA\n");
78 return err;
79 }
80 mem_reg = &iser_task->rdma_reg[ISER_DIR_IN];
81
82 hdr->flags |= ISER_RSV;
83 hdr->read_stag = cpu_to_be32(mem_reg->rkey);
84 hdr->read_va = cpu_to_be64(mem_reg->sge.addr);
85
86 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
87 task->itt, mem_reg->rkey,
88 (unsigned long long)mem_reg->sge.addr);
89
90 return 0;
91 }
92
93 /* Register user buffer memory and initialize passive rdma
94 * dto descriptor. Data size is stored in
95 * task->data[ISER_DIR_OUT].data_len, Protection size
96 * is stored at task->prot[ISER_DIR_OUT].data_len
97 */
98 static int
iser_prepare_write_cmd(struct iscsi_task * task,unsigned int imm_sz,unsigned int unsol_sz,unsigned int edtl)99 iser_prepare_write_cmd(struct iscsi_task *task,
100 unsigned int imm_sz,
101 unsigned int unsol_sz,
102 unsigned int edtl)
103 {
104 struct iscsi_iser_task *iser_task = task->dd_data;
105 struct iser_mem_reg *mem_reg;
106 int err;
107 struct iser_ctrl *hdr = &iser_task->desc.iser_header;
108 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
109 struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
110
111 err = iser_dma_map_task_data(iser_task,
112 buf_out,
113 ISER_DIR_OUT,
114 DMA_TO_DEVICE);
115 if (err)
116 return err;
117
118 if (scsi_prot_sg_count(iser_task->sc)) {
119 struct iser_data_buf *pbuf_out = &iser_task->prot[ISER_DIR_OUT];
120
121 err = iser_dma_map_task_data(iser_task,
122 pbuf_out,
123 ISER_DIR_OUT,
124 DMA_TO_DEVICE);
125 if (err)
126 return err;
127 }
128
129 err = iser_reg_mem_fastreg(iser_task, ISER_DIR_OUT,
130 buf_out->data_len == imm_sz);
131 if (err != 0) {
132 iser_err("Failed to register write cmd RDMA mem\n");
133 return err;
134 }
135
136 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
137
138 if (unsol_sz < edtl) {
139 hdr->flags |= ISER_WSV;
140 if (buf_out->data_len > imm_sz) {
141 hdr->write_stag = cpu_to_be32(mem_reg->rkey);
142 hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz);
143 }
144
145 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X VA:%#llX + unsol:%d\n",
146 task->itt, mem_reg->rkey,
147 (unsigned long long)mem_reg->sge.addr, unsol_sz);
148 }
149
150 if (imm_sz > 0) {
151 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
152 task->itt, imm_sz);
153 tx_dsg->addr = mem_reg->sge.addr;
154 tx_dsg->length = imm_sz;
155 tx_dsg->lkey = mem_reg->sge.lkey;
156 iser_task->desc.num_sge = 2;
157 }
158
159 return 0;
160 }
161
162 /* creates a new tx descriptor and adds header regd buffer */
iser_create_send_desc(struct iser_conn * iser_conn,struct iser_tx_desc * tx_desc)163 static void iser_create_send_desc(struct iser_conn *iser_conn,
164 struct iser_tx_desc *tx_desc)
165 {
166 struct iser_device *device = iser_conn->ib_conn.device;
167
168 ib_dma_sync_single_for_cpu(device->ib_device,
169 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
170
171 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
172 tx_desc->iser_header.flags = ISER_VER;
173 tx_desc->num_sge = 1;
174 }
175
iser_free_login_buf(struct iser_conn * iser_conn)176 static void iser_free_login_buf(struct iser_conn *iser_conn)
177 {
178 struct iser_device *device = iser_conn->ib_conn.device;
179 struct iser_login_desc *desc = &iser_conn->login_desc;
180
181 if (!desc->req)
182 return;
183
184 ib_dma_unmap_single(device->ib_device, desc->req_dma,
185 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
186
187 ib_dma_unmap_single(device->ib_device, desc->rsp_dma,
188 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
189
190 kfree(desc->req);
191 kfree(desc->rsp);
192
193 /* make sure we never redo any unmapping */
194 desc->req = NULL;
195 desc->rsp = NULL;
196 }
197
iser_alloc_login_buf(struct iser_conn * iser_conn)198 static int iser_alloc_login_buf(struct iser_conn *iser_conn)
199 {
200 struct iser_device *device = iser_conn->ib_conn.device;
201 struct iser_login_desc *desc = &iser_conn->login_desc;
202
203 desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
204 if (!desc->req)
205 return -ENOMEM;
206
207 desc->req_dma = ib_dma_map_single(device->ib_device, desc->req,
208 ISCSI_DEF_MAX_RECV_SEG_LEN,
209 DMA_TO_DEVICE);
210 if (ib_dma_mapping_error(device->ib_device,
211 desc->req_dma))
212 goto free_req;
213
214 desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL);
215 if (!desc->rsp)
216 goto unmap_req;
217
218 desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp,
219 ISER_RX_LOGIN_SIZE,
220 DMA_FROM_DEVICE);
221 if (ib_dma_mapping_error(device->ib_device,
222 desc->rsp_dma))
223 goto free_rsp;
224
225 return 0;
226
227 free_rsp:
228 kfree(desc->rsp);
229 unmap_req:
230 ib_dma_unmap_single(device->ib_device, desc->req_dma,
231 ISCSI_DEF_MAX_RECV_SEG_LEN,
232 DMA_TO_DEVICE);
233 free_req:
234 kfree(desc->req);
235
236 return -ENOMEM;
237 }
238
iser_alloc_rx_descriptors(struct iser_conn * iser_conn,struct iscsi_session * session)239 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
240 struct iscsi_session *session)
241 {
242 int i, j;
243 u64 dma_addr;
244 struct iser_rx_desc *rx_desc;
245 struct ib_sge *rx_sg;
246 struct ib_conn *ib_conn = &iser_conn->ib_conn;
247 struct iser_device *device = ib_conn->device;
248
249 iser_conn->qp_max_recv_dtos = session->cmds_max;
250 iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */
251 iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2;
252
253 if (iser_alloc_fastreg_pool(ib_conn, session->scsi_cmds_max,
254 iser_conn->pages_per_mr))
255 goto create_rdma_reg_res_failed;
256
257 if (iser_alloc_login_buf(iser_conn))
258 goto alloc_login_buf_fail;
259
260 iser_conn->num_rx_descs = session->cmds_max;
261 iser_conn->rx_descs = kmalloc_array(iser_conn->num_rx_descs,
262 sizeof(struct iser_rx_desc),
263 GFP_KERNEL);
264 if (!iser_conn->rx_descs)
265 goto rx_desc_alloc_fail;
266
267 rx_desc = iser_conn->rx_descs;
268
269 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) {
270 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
271 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
272 if (ib_dma_mapping_error(device->ib_device, dma_addr))
273 goto rx_desc_dma_map_failed;
274
275 rx_desc->dma_addr = dma_addr;
276 rx_desc->cqe.done = iser_task_rsp;
277 rx_sg = &rx_desc->rx_sg;
278 rx_sg->addr = rx_desc->dma_addr;
279 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
280 rx_sg->lkey = device->pd->local_dma_lkey;
281 }
282
283 iser_conn->rx_desc_head = 0;
284 return 0;
285
286 rx_desc_dma_map_failed:
287 rx_desc = iser_conn->rx_descs;
288 for (j = 0; j < i; j++, rx_desc++)
289 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
290 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
291 kfree(iser_conn->rx_descs);
292 iser_conn->rx_descs = NULL;
293 rx_desc_alloc_fail:
294 iser_free_login_buf(iser_conn);
295 alloc_login_buf_fail:
296 iser_free_fastreg_pool(ib_conn);
297 create_rdma_reg_res_failed:
298 iser_err("failed allocating rx descriptors / data buffers\n");
299 return -ENOMEM;
300 }
301
iser_free_rx_descriptors(struct iser_conn * iser_conn)302 void iser_free_rx_descriptors(struct iser_conn *iser_conn)
303 {
304 int i;
305 struct iser_rx_desc *rx_desc;
306 struct ib_conn *ib_conn = &iser_conn->ib_conn;
307 struct iser_device *device = ib_conn->device;
308
309 iser_free_fastreg_pool(ib_conn);
310
311 rx_desc = iser_conn->rx_descs;
312 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)
313 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
314 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
315 kfree(iser_conn->rx_descs);
316 /* make sure we never redo any unmapping */
317 iser_conn->rx_descs = NULL;
318
319 iser_free_login_buf(iser_conn);
320 }
321
iser_post_rx_bufs(struct iscsi_conn * conn,struct iscsi_hdr * req)322 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
323 {
324 struct iser_conn *iser_conn = conn->dd_data;
325 struct ib_conn *ib_conn = &iser_conn->ib_conn;
326 struct iscsi_session *session = conn->session;
327
328 iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
329 /* check if this is the last login - going to full feature phase */
330 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
331 return 0;
332
333 /*
334 * Check that there is one posted recv buffer
335 * (for the last login response).
336 */
337 WARN_ON(ib_conn->post_recv_buf_count != 1);
338
339 if (session->discovery_sess) {
340 iser_info("Discovery session, re-using login RX buffer\n");
341 return 0;
342 } else
343 iser_info("Normal session, posting batch of RX %d buffers\n",
344 iser_conn->min_posted_rx);
345
346 /* Initial post receive buffers */
347 if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx))
348 return -ENOMEM;
349
350 return 0;
351 }
352
iser_signal_comp(u8 sig_count)353 static inline bool iser_signal_comp(u8 sig_count)
354 {
355 return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0);
356 }
357
358 /**
359 * iser_send_command - send command PDU
360 * @conn: link to matching iscsi connection
361 * @task: SCSI command task
362 */
iser_send_command(struct iscsi_conn * conn,struct iscsi_task * task)363 int iser_send_command(struct iscsi_conn *conn,
364 struct iscsi_task *task)
365 {
366 struct iser_conn *iser_conn = conn->dd_data;
367 struct iscsi_iser_task *iser_task = task->dd_data;
368 unsigned long edtl;
369 int err;
370 struct iser_data_buf *data_buf, *prot_buf;
371 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
372 struct scsi_cmnd *sc = task->sc;
373 struct iser_tx_desc *tx_desc = &iser_task->desc;
374 u8 sig_count = ++iser_conn->ib_conn.sig_count;
375
376 edtl = ntohl(hdr->data_length);
377
378 /* build the tx desc regd header and add it to the tx desc dto */
379 tx_desc->type = ISCSI_TX_SCSI_COMMAND;
380 tx_desc->cqe.done = iser_cmd_comp;
381 iser_create_send_desc(iser_conn, tx_desc);
382
383 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
384 data_buf = &iser_task->data[ISER_DIR_IN];
385 prot_buf = &iser_task->prot[ISER_DIR_IN];
386 } else {
387 data_buf = &iser_task->data[ISER_DIR_OUT];
388 prot_buf = &iser_task->prot[ISER_DIR_OUT];
389 }
390
391 if (scsi_sg_count(sc)) { /* using a scatter list */
392 data_buf->sg = scsi_sglist(sc);
393 data_buf->size = scsi_sg_count(sc);
394 }
395 data_buf->data_len = scsi_bufflen(sc);
396
397 if (scsi_prot_sg_count(sc)) {
398 prot_buf->sg = scsi_prot_sglist(sc);
399 prot_buf->size = scsi_prot_sg_count(sc);
400 prot_buf->data_len = (data_buf->data_len >>
401 ilog2(sc->device->sector_size)) * 8;
402 }
403
404 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
405 err = iser_prepare_read_cmd(task);
406 if (err)
407 goto send_command_error;
408 }
409 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
410 err = iser_prepare_write_cmd(task,
411 task->imm_count,
412 task->imm_count +
413 task->unsol_r2t.data_length,
414 edtl);
415 if (err)
416 goto send_command_error;
417 }
418
419 iser_task->status = ISER_TASK_STATUS_STARTED;
420
421 err = iser_post_send(&iser_conn->ib_conn, tx_desc,
422 iser_signal_comp(sig_count));
423 if (!err)
424 return 0;
425
426 send_command_error:
427 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
428 return err;
429 }
430
431 /**
432 * iser_send_data_out - send data out PDU
433 * @conn: link to matching iscsi connection
434 * @task: SCSI command task
435 * @hdr: pointer to the LLD's iSCSI message header
436 */
iser_send_data_out(struct iscsi_conn * conn,struct iscsi_task * task,struct iscsi_data * hdr)437 int iser_send_data_out(struct iscsi_conn *conn,
438 struct iscsi_task *task,
439 struct iscsi_data *hdr)
440 {
441 struct iser_conn *iser_conn = conn->dd_data;
442 struct iscsi_iser_task *iser_task = task->dd_data;
443 struct iser_tx_desc *tx_desc;
444 struct iser_mem_reg *mem_reg;
445 unsigned long buf_offset;
446 unsigned long data_seg_len;
447 uint32_t itt;
448 int err;
449 struct ib_sge *tx_dsg;
450
451 itt = (__force uint32_t)hdr->itt;
452 data_seg_len = ntoh24(hdr->dlength);
453 buf_offset = ntohl(hdr->offset);
454
455 iser_dbg("%s itt %d dseg_len %d offset %d\n",
456 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
457
458 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
459 if (!tx_desc)
460 return -ENOMEM;
461
462 tx_desc->type = ISCSI_TX_DATAOUT;
463 tx_desc->cqe.done = iser_dataout_comp;
464 tx_desc->iser_header.flags = ISER_VER;
465 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
466
467 /* build the tx desc */
468 err = iser_initialize_task_headers(task, tx_desc);
469 if (err)
470 goto send_data_out_error;
471
472 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
473 tx_dsg = &tx_desc->tx_sg[1];
474 tx_dsg->addr = mem_reg->sge.addr + buf_offset;
475 tx_dsg->length = data_seg_len;
476 tx_dsg->lkey = mem_reg->sge.lkey;
477 tx_desc->num_sge = 2;
478
479 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
480 iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n",
481 buf_offset, data_seg_len,
482 iser_task->data[ISER_DIR_OUT].data_len, itt);
483 err = -EINVAL;
484 goto send_data_out_error;
485 }
486 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
487 itt, buf_offset, data_seg_len);
488
489
490 err = iser_post_send(&iser_conn->ib_conn, tx_desc, true);
491 if (!err)
492 return 0;
493
494 send_data_out_error:
495 kmem_cache_free(ig.desc_cache, tx_desc);
496 iser_err("conn %p failed err %d\n", conn, err);
497 return err;
498 }
499
iser_send_control(struct iscsi_conn * conn,struct iscsi_task * task)500 int iser_send_control(struct iscsi_conn *conn,
501 struct iscsi_task *task)
502 {
503 struct iser_conn *iser_conn = conn->dd_data;
504 struct iscsi_iser_task *iser_task = task->dd_data;
505 struct iser_tx_desc *mdesc = &iser_task->desc;
506 unsigned long data_seg_len;
507 int err = 0;
508 struct iser_device *device;
509
510 /* build the tx desc regd header and add it to the tx desc dto */
511 mdesc->type = ISCSI_TX_CONTROL;
512 mdesc->cqe.done = iser_ctrl_comp;
513 iser_create_send_desc(iser_conn, mdesc);
514
515 device = iser_conn->ib_conn.device;
516
517 data_seg_len = ntoh24(task->hdr->dlength);
518
519 if (data_seg_len > 0) {
520 struct iser_login_desc *desc = &iser_conn->login_desc;
521 struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
522
523 if (task != conn->login_task) {
524 iser_err("data present on non login task!!!\n");
525 goto send_control_error;
526 }
527
528 ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma,
529 task->data_count, DMA_TO_DEVICE);
530
531 memcpy(desc->req, task->data, task->data_count);
532
533 ib_dma_sync_single_for_device(device->ib_device, desc->req_dma,
534 task->data_count, DMA_TO_DEVICE);
535
536 tx_dsg->addr = desc->req_dma;
537 tx_dsg->length = task->data_count;
538 tx_dsg->lkey = device->pd->local_dma_lkey;
539 mdesc->num_sge = 2;
540 }
541
542 if (task == conn->login_task) {
543 iser_dbg("op %x dsl %lx, posting login rx buffer\n",
544 task->hdr->opcode, data_seg_len);
545 err = iser_post_recvl(iser_conn);
546 if (err)
547 goto send_control_error;
548 err = iser_post_rx_bufs(conn, task->hdr);
549 if (err)
550 goto send_control_error;
551 }
552
553 err = iser_post_send(&iser_conn->ib_conn, mdesc, true);
554 if (!err)
555 return 0;
556
557 send_control_error:
558 iser_err("conn %p failed err %d\n",conn, err);
559 return err;
560 }
561
iser_login_rsp(struct ib_cq * cq,struct ib_wc * wc)562 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc)
563 {
564 struct ib_conn *ib_conn = wc->qp->qp_context;
565 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
566 struct iser_login_desc *desc = iser_login(wc->wr_cqe);
567 struct iscsi_hdr *hdr;
568 char *data;
569 int length;
570
571 if (unlikely(wc->status != IB_WC_SUCCESS)) {
572 iser_err_comp(wc, "login_rsp");
573 return;
574 }
575
576 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
577 desc->rsp_dma, ISER_RX_LOGIN_SIZE,
578 DMA_FROM_DEVICE);
579
580 hdr = desc->rsp + sizeof(struct iser_ctrl);
581 data = desc->rsp + ISER_HEADERS_LEN;
582 length = wc->byte_len - ISER_HEADERS_LEN;
583
584 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
585 hdr->itt, length);
586
587 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length);
588
589 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
590 desc->rsp_dma, ISER_RX_LOGIN_SIZE,
591 DMA_FROM_DEVICE);
592
593 ib_conn->post_recv_buf_count--;
594 }
595
596 static inline int
iser_inv_desc(struct iser_fr_desc * desc,u32 rkey)597 iser_inv_desc(struct iser_fr_desc *desc, u32 rkey)
598 {
599 if (unlikely((!desc->sig_protected && rkey != desc->rsc.mr->rkey) ||
600 (desc->sig_protected && rkey != desc->rsc.sig_mr->rkey))) {
601 iser_err("Bogus remote invalidation for rkey %#x\n", rkey);
602 return -EINVAL;
603 }
604
605 desc->rsc.mr_valid = 0;
606
607 return 0;
608 }
609
610 static int
iser_check_remote_inv(struct iser_conn * iser_conn,struct ib_wc * wc,struct iscsi_hdr * hdr)611 iser_check_remote_inv(struct iser_conn *iser_conn,
612 struct ib_wc *wc,
613 struct iscsi_hdr *hdr)
614 {
615 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
616 struct iscsi_task *task;
617 u32 rkey = wc->ex.invalidate_rkey;
618
619 iser_dbg("conn %p: remote invalidation for rkey %#x\n",
620 iser_conn, rkey);
621
622 if (unlikely(!iser_conn->snd_w_inv)) {
623 iser_err("conn %p: unexpected remote invalidation, terminating connection\n",
624 iser_conn);
625 return -EPROTO;
626 }
627
628 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt);
629 if (likely(task)) {
630 struct iscsi_iser_task *iser_task = task->dd_data;
631 struct iser_fr_desc *desc;
632
633 if (iser_task->dir[ISER_DIR_IN]) {
634 desc = iser_task->rdma_reg[ISER_DIR_IN].mem_h;
635 if (unlikely(iser_inv_desc(desc, rkey)))
636 return -EINVAL;
637 }
638
639 if (iser_task->dir[ISER_DIR_OUT]) {
640 desc = iser_task->rdma_reg[ISER_DIR_OUT].mem_h;
641 if (unlikely(iser_inv_desc(desc, rkey)))
642 return -EINVAL;
643 }
644 } else {
645 iser_err("failed to get task for itt=%d\n", hdr->itt);
646 return -EINVAL;
647 }
648 }
649
650 return 0;
651 }
652
653
iser_task_rsp(struct ib_cq * cq,struct ib_wc * wc)654 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc)
655 {
656 struct ib_conn *ib_conn = wc->qp->qp_context;
657 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
658 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe);
659 struct iscsi_hdr *hdr;
660 int length;
661 int outstanding, count, err;
662
663 if (unlikely(wc->status != IB_WC_SUCCESS)) {
664 iser_err_comp(wc, "task_rsp");
665 return;
666 }
667
668 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
669 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
670 DMA_FROM_DEVICE);
671
672 hdr = &desc->iscsi_header;
673 length = wc->byte_len - ISER_HEADERS_LEN;
674
675 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
676 hdr->itt, length);
677
678 if (iser_check_remote_inv(iser_conn, wc, hdr)) {
679 iscsi_conn_failure(iser_conn->iscsi_conn,
680 ISCSI_ERR_CONN_FAILED);
681 return;
682 }
683
684 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length);
685
686 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
687 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
688 DMA_FROM_DEVICE);
689
690 /* decrementing conn->post_recv_buf_count only --after-- freeing the *
691 * task eliminates the need to worry on tasks which are completed in *
692 * parallel to the execution of iser_conn_term. So the code that waits *
693 * for the posted rx bufs refcount to become zero handles everything */
694 ib_conn->post_recv_buf_count--;
695
696 outstanding = ib_conn->post_recv_buf_count;
697 if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) {
698 count = min(iser_conn->qp_max_recv_dtos - outstanding,
699 iser_conn->min_posted_rx);
700 err = iser_post_recvm(iser_conn, count);
701 if (err)
702 iser_err("posting %d rx bufs err %d\n", count, err);
703 }
704 }
705
iser_cmd_comp(struct ib_cq * cq,struct ib_wc * wc)706 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc)
707 {
708 if (unlikely(wc->status != IB_WC_SUCCESS))
709 iser_err_comp(wc, "command");
710 }
711
iser_ctrl_comp(struct ib_cq * cq,struct ib_wc * wc)712 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc)
713 {
714 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
715 struct iscsi_task *task;
716
717 if (unlikely(wc->status != IB_WC_SUCCESS)) {
718 iser_err_comp(wc, "control");
719 return;
720 }
721
722 /* this arithmetic is legal by libiscsi dd_data allocation */
723 task = (void *)desc - sizeof(struct iscsi_task);
724 if (task->hdr->itt == RESERVED_ITT)
725 iscsi_put_task(task);
726 }
727
iser_dataout_comp(struct ib_cq * cq,struct ib_wc * wc)728 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc)
729 {
730 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
731 struct ib_conn *ib_conn = wc->qp->qp_context;
732 struct iser_device *device = ib_conn->device;
733
734 if (unlikely(wc->status != IB_WC_SUCCESS))
735 iser_err_comp(wc, "dataout");
736
737 ib_dma_unmap_single(device->ib_device, desc->dma_addr,
738 ISER_HEADERS_LEN, DMA_TO_DEVICE);
739 kmem_cache_free(ig.desc_cache, desc);
740 }
741
iser_task_rdma_init(struct iscsi_iser_task * iser_task)742 void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
743
744 {
745 iser_task->status = ISER_TASK_STATUS_INIT;
746
747 iser_task->dir[ISER_DIR_IN] = 0;
748 iser_task->dir[ISER_DIR_OUT] = 0;
749
750 iser_task->data[ISER_DIR_IN].data_len = 0;
751 iser_task->data[ISER_DIR_OUT].data_len = 0;
752
753 iser_task->prot[ISER_DIR_IN].data_len = 0;
754 iser_task->prot[ISER_DIR_OUT].data_len = 0;
755
756 iser_task->prot[ISER_DIR_IN].dma_nents = 0;
757 iser_task->prot[ISER_DIR_OUT].dma_nents = 0;
758
759 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0,
760 sizeof(struct iser_mem_reg));
761 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,
762 sizeof(struct iser_mem_reg));
763 }
764
iser_task_rdma_finalize(struct iscsi_iser_task * iser_task)765 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
766 {
767 int prot_count = scsi_prot_sg_count(iser_task->sc);
768
769 if (iser_task->dir[ISER_DIR_IN]) {
770 iser_unreg_mem_fastreg(iser_task, ISER_DIR_IN);
771 iser_dma_unmap_task_data(iser_task,
772 &iser_task->data[ISER_DIR_IN],
773 DMA_FROM_DEVICE);
774 if (prot_count)
775 iser_dma_unmap_task_data(iser_task,
776 &iser_task->prot[ISER_DIR_IN],
777 DMA_FROM_DEVICE);
778 }
779
780 if (iser_task->dir[ISER_DIR_OUT]) {
781 iser_unreg_mem_fastreg(iser_task, ISER_DIR_OUT);
782 iser_dma_unmap_task_data(iser_task,
783 &iser_task->data[ISER_DIR_OUT],
784 DMA_TO_DEVICE);
785 if (prot_count)
786 iser_dma_unmap_task_data(iser_task,
787 &iser_task->prot[ISER_DIR_OUT],
788 DMA_TO_DEVICE);
789 }
790 }
791