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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
44
45
46
47
48static 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_rdma_mem(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
94
95
96
97
98static int
99iser_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_rdma_mem(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
163static 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
176static 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
194 desc->req = NULL;
195 desc->rsp = NULL;
196}
197
198static 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
227free_rsp:
228 kfree(desc->rsp);
229unmap_req:
230 ib_dma_unmap_single(device->ib_device, desc->req_dma,
231 ISCSI_DEF_MAX_RECV_SEG_LEN,
232 DMA_TO_DEVICE);
233free_req:
234 kfree(desc->req);
235
236 return -ENOMEM;
237}
238
239int 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;
251 iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2;
252
253 if (device->reg_ops->alloc_reg_res(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
286rx_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;
293rx_desc_alloc_fail:
294 iser_free_login_buf(iser_conn);
295alloc_login_buf_fail:
296 device->reg_ops->free_reg_res(ib_conn);
297create_rdma_reg_res_failed:
298 iser_err("failed allocating rx descriptors / data buffers\n");
299 return -ENOMEM;
300}
301
302void 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 if (device->reg_ops->free_reg_res)
310 device->reg_ops->free_reg_res(ib_conn);
311
312 rx_desc = iser_conn->rx_descs;
313 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)
314 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
315 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
316 kfree(iser_conn->rx_descs);
317
318 iser_conn->rx_descs = NULL;
319
320 iser_free_login_buf(iser_conn);
321}
322
323static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
324{
325 struct iser_conn *iser_conn = conn->dd_data;
326 struct ib_conn *ib_conn = &iser_conn->ib_conn;
327 struct iscsi_session *session = conn->session;
328
329 iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
330
331 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
332 return 0;
333
334
335
336
337
338 WARN_ON(ib_conn->post_recv_buf_count != 1);
339
340 if (session->discovery_sess) {
341 iser_info("Discovery session, re-using login RX buffer\n");
342 return 0;
343 } else
344 iser_info("Normal session, posting batch of RX %d buffers\n",
345 iser_conn->min_posted_rx);
346
347
348 if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx))
349 return -ENOMEM;
350
351 return 0;
352}
353
354static inline bool iser_signal_comp(u8 sig_count)
355{
356 return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0);
357}
358
359
360
361
362int iser_send_command(struct iscsi_conn *conn,
363 struct iscsi_task *task)
364{
365 struct iser_conn *iser_conn = conn->dd_data;
366 struct iscsi_iser_task *iser_task = task->dd_data;
367 unsigned long edtl;
368 int err;
369 struct iser_data_buf *data_buf, *prot_buf;
370 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
371 struct scsi_cmnd *sc = task->sc;
372 struct iser_tx_desc *tx_desc = &iser_task->desc;
373 u8 sig_count = ++iser_conn->ib_conn.sig_count;
374
375 edtl = ntohl(hdr->data_length);
376
377
378 tx_desc->type = ISCSI_TX_SCSI_COMMAND;
379 tx_desc->cqe.done = iser_cmd_comp;
380 iser_create_send_desc(iser_conn, tx_desc);
381
382 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
383 data_buf = &iser_task->data[ISER_DIR_IN];
384 prot_buf = &iser_task->prot[ISER_DIR_IN];
385 } else {
386 data_buf = &iser_task->data[ISER_DIR_OUT];
387 prot_buf = &iser_task->prot[ISER_DIR_OUT];
388 }
389
390 if (scsi_sg_count(sc)) {
391 data_buf->sg = scsi_sglist(sc);
392 data_buf->size = scsi_sg_count(sc);
393 }
394 data_buf->data_len = scsi_bufflen(sc);
395
396 if (scsi_prot_sg_count(sc)) {
397 prot_buf->sg = scsi_prot_sglist(sc);
398 prot_buf->size = scsi_prot_sg_count(sc);
399 prot_buf->data_len = (data_buf->data_len >>
400 ilog2(sc->device->sector_size)) * 8;
401 }
402
403 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
404 err = iser_prepare_read_cmd(task);
405 if (err)
406 goto send_command_error;
407 }
408 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
409 err = iser_prepare_write_cmd(task,
410 task->imm_count,
411 task->imm_count +
412 task->unsol_r2t.data_length,
413 edtl);
414 if (err)
415 goto send_command_error;
416 }
417
418 iser_task->status = ISER_TASK_STATUS_STARTED;
419
420 err = iser_post_send(&iser_conn->ib_conn, tx_desc,
421 iser_signal_comp(sig_count));
422 if (!err)
423 return 0;
424
425send_command_error:
426 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
427 return err;
428}
429
430
431
432
433int iser_send_data_out(struct iscsi_conn *conn,
434 struct iscsi_task *task,
435 struct iscsi_data *hdr)
436{
437 struct iser_conn *iser_conn = conn->dd_data;
438 struct iscsi_iser_task *iser_task = task->dd_data;
439 struct iser_tx_desc *tx_desc;
440 struct iser_mem_reg *mem_reg;
441 unsigned long buf_offset;
442 unsigned long data_seg_len;
443 uint32_t itt;
444 int err;
445 struct ib_sge *tx_dsg;
446
447 itt = (__force uint32_t)hdr->itt;
448 data_seg_len = ntoh24(hdr->dlength);
449 buf_offset = ntohl(hdr->offset);
450
451 iser_dbg("%s itt %d dseg_len %d offset %d\n",
452 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
453
454 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
455 if (!tx_desc)
456 return -ENOMEM;
457
458 tx_desc->type = ISCSI_TX_DATAOUT;
459 tx_desc->cqe.done = iser_dataout_comp;
460 tx_desc->iser_header.flags = ISER_VER;
461 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
462
463
464 err = iser_initialize_task_headers(task, tx_desc);
465 if (err)
466 goto send_data_out_error;
467
468 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
469 tx_dsg = &tx_desc->tx_sg[1];
470 tx_dsg->addr = mem_reg->sge.addr + buf_offset;
471 tx_dsg->length = data_seg_len;
472 tx_dsg->lkey = mem_reg->sge.lkey;
473 tx_desc->num_sge = 2;
474
475 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
476 iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n",
477 buf_offset, data_seg_len,
478 iser_task->data[ISER_DIR_OUT].data_len, itt);
479 err = -EINVAL;
480 goto send_data_out_error;
481 }
482 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
483 itt, buf_offset, data_seg_len);
484
485
486 err = iser_post_send(&iser_conn->ib_conn, tx_desc, true);
487 if (!err)
488 return 0;
489
490send_data_out_error:
491 kmem_cache_free(ig.desc_cache, tx_desc);
492 iser_err("conn %p failed err %d\n", conn, err);
493 return err;
494}
495
496int iser_send_control(struct iscsi_conn *conn,
497 struct iscsi_task *task)
498{
499 struct iser_conn *iser_conn = conn->dd_data;
500 struct iscsi_iser_task *iser_task = task->dd_data;
501 struct iser_tx_desc *mdesc = &iser_task->desc;
502 unsigned long data_seg_len;
503 int err = 0;
504 struct iser_device *device;
505
506
507 mdesc->type = ISCSI_TX_CONTROL;
508 mdesc->cqe.done = iser_ctrl_comp;
509 iser_create_send_desc(iser_conn, mdesc);
510
511 device = iser_conn->ib_conn.device;
512
513 data_seg_len = ntoh24(task->hdr->dlength);
514
515 if (data_seg_len > 0) {
516 struct iser_login_desc *desc = &iser_conn->login_desc;
517 struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
518
519 if (task != conn->login_task) {
520 iser_err("data present on non login task!!!\n");
521 goto send_control_error;
522 }
523
524 ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma,
525 task->data_count, DMA_TO_DEVICE);
526
527 memcpy(desc->req, task->data, task->data_count);
528
529 ib_dma_sync_single_for_device(device->ib_device, desc->req_dma,
530 task->data_count, DMA_TO_DEVICE);
531
532 tx_dsg->addr = desc->req_dma;
533 tx_dsg->length = task->data_count;
534 tx_dsg->lkey = device->pd->local_dma_lkey;
535 mdesc->num_sge = 2;
536 }
537
538 if (task == conn->login_task) {
539 iser_dbg("op %x dsl %lx, posting login rx buffer\n",
540 task->hdr->opcode, data_seg_len);
541 err = iser_post_recvl(iser_conn);
542 if (err)
543 goto send_control_error;
544 err = iser_post_rx_bufs(conn, task->hdr);
545 if (err)
546 goto send_control_error;
547 }
548
549 err = iser_post_send(&iser_conn->ib_conn, mdesc, true);
550 if (!err)
551 return 0;
552
553send_control_error:
554 iser_err("conn %p failed err %d\n",conn, err);
555 return err;
556}
557
558void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc)
559{
560 struct ib_conn *ib_conn = wc->qp->qp_context;
561 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
562 struct iser_login_desc *desc = iser_login(wc->wr_cqe);
563 struct iscsi_hdr *hdr;
564 char *data;
565 int length;
566
567 if (unlikely(wc->status != IB_WC_SUCCESS)) {
568 iser_err_comp(wc, "login_rsp");
569 return;
570 }
571
572 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
573 desc->rsp_dma, ISER_RX_LOGIN_SIZE,
574 DMA_FROM_DEVICE);
575
576 hdr = desc->rsp + sizeof(struct iser_ctrl);
577 data = desc->rsp + ISER_HEADERS_LEN;
578 length = wc->byte_len - ISER_HEADERS_LEN;
579
580 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
581 hdr->itt, length);
582
583 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length);
584
585 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
586 desc->rsp_dma, ISER_RX_LOGIN_SIZE,
587 DMA_FROM_DEVICE);
588
589 ib_conn->post_recv_buf_count--;
590}
591
592static inline int
593iser_inv_desc(struct iser_fr_desc *desc, u32 rkey)
594{
595 if (unlikely((!desc->sig_protected && rkey != desc->rsc.mr->rkey) ||
596 (desc->sig_protected && rkey != desc->rsc.sig_mr->rkey))) {
597 iser_err("Bogus remote invalidation for rkey %#x\n", rkey);
598 return -EINVAL;
599 }
600
601 desc->rsc.mr_valid = 0;
602
603 return 0;
604}
605
606static int
607iser_check_remote_inv(struct iser_conn *iser_conn,
608 struct ib_wc *wc,
609 struct iscsi_hdr *hdr)
610{
611 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
612 struct iscsi_task *task;
613 u32 rkey = wc->ex.invalidate_rkey;
614
615 iser_dbg("conn %p: remote invalidation for rkey %#x\n",
616 iser_conn, rkey);
617
618 if (unlikely(!iser_conn->snd_w_inv)) {
619 iser_err("conn %p: unexpected remote invalidation, terminating connection\n",
620 iser_conn);
621 return -EPROTO;
622 }
623
624 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt);
625 if (likely(task)) {
626 struct iscsi_iser_task *iser_task = task->dd_data;
627 struct iser_fr_desc *desc;
628
629 if (iser_task->dir[ISER_DIR_IN]) {
630 desc = iser_task->rdma_reg[ISER_DIR_IN].mem_h;
631 if (unlikely(iser_inv_desc(desc, rkey)))
632 return -EINVAL;
633 }
634
635 if (iser_task->dir[ISER_DIR_OUT]) {
636 desc = iser_task->rdma_reg[ISER_DIR_OUT].mem_h;
637 if (unlikely(iser_inv_desc(desc, rkey)))
638 return -EINVAL;
639 }
640 } else {
641 iser_err("failed to get task for itt=%d\n", hdr->itt);
642 return -EINVAL;
643 }
644 }
645
646 return 0;
647}
648
649
650void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc)
651{
652 struct ib_conn *ib_conn = wc->qp->qp_context;
653 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
654 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe);
655 struct iscsi_hdr *hdr;
656 int length;
657 int outstanding, count, err;
658
659 if (unlikely(wc->status != IB_WC_SUCCESS)) {
660 iser_err_comp(wc, "task_rsp");
661 return;
662 }
663
664 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
665 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
666 DMA_FROM_DEVICE);
667
668 hdr = &desc->iscsi_header;
669 length = wc->byte_len - ISER_HEADERS_LEN;
670
671 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
672 hdr->itt, length);
673
674 if (iser_check_remote_inv(iser_conn, wc, hdr)) {
675 iscsi_conn_failure(iser_conn->iscsi_conn,
676 ISCSI_ERR_CONN_FAILED);
677 return;
678 }
679
680 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length);
681
682 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
683 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
684 DMA_FROM_DEVICE);
685
686
687
688
689
690 ib_conn->post_recv_buf_count--;
691
692 outstanding = ib_conn->post_recv_buf_count;
693 if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) {
694 count = min(iser_conn->qp_max_recv_dtos - outstanding,
695 iser_conn->min_posted_rx);
696 err = iser_post_recvm(iser_conn, count);
697 if (err)
698 iser_err("posting %d rx bufs err %d\n", count, err);
699 }
700}
701
702void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc)
703{
704 if (unlikely(wc->status != IB_WC_SUCCESS))
705 iser_err_comp(wc, "command");
706}
707
708void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc)
709{
710 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
711 struct iscsi_task *task;
712
713 if (unlikely(wc->status != IB_WC_SUCCESS)) {
714 iser_err_comp(wc, "control");
715 return;
716 }
717
718
719 task = (void *)desc - sizeof(struct iscsi_task);
720 if (task->hdr->itt == RESERVED_ITT)
721 iscsi_put_task(task);
722}
723
724void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc)
725{
726 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
727 struct ib_conn *ib_conn = wc->qp->qp_context;
728 struct iser_device *device = ib_conn->device;
729
730 if (unlikely(wc->status != IB_WC_SUCCESS))
731 iser_err_comp(wc, "dataout");
732
733 ib_dma_unmap_single(device->ib_device, desc->dma_addr,
734 ISER_HEADERS_LEN, DMA_TO_DEVICE);
735 kmem_cache_free(ig.desc_cache, desc);
736}
737
738void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
739
740{
741 iser_task->status = ISER_TASK_STATUS_INIT;
742
743 iser_task->dir[ISER_DIR_IN] = 0;
744 iser_task->dir[ISER_DIR_OUT] = 0;
745
746 iser_task->data[ISER_DIR_IN].data_len = 0;
747 iser_task->data[ISER_DIR_OUT].data_len = 0;
748
749 iser_task->prot[ISER_DIR_IN].data_len = 0;
750 iser_task->prot[ISER_DIR_OUT].data_len = 0;
751
752 iser_task->prot[ISER_DIR_IN].dma_nents = 0;
753 iser_task->prot[ISER_DIR_OUT].dma_nents = 0;
754
755 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0,
756 sizeof(struct iser_mem_reg));
757 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,
758 sizeof(struct iser_mem_reg));
759}
760
761void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
762{
763 int prot_count = scsi_prot_sg_count(iser_task->sc);
764
765 if (iser_task->dir[ISER_DIR_IN]) {
766 iser_unreg_rdma_mem(iser_task, ISER_DIR_IN);
767 iser_dma_unmap_task_data(iser_task,
768 &iser_task->data[ISER_DIR_IN],
769 DMA_FROM_DEVICE);
770 if (prot_count)
771 iser_dma_unmap_task_data(iser_task,
772 &iser_task->prot[ISER_DIR_IN],
773 DMA_FROM_DEVICE);
774 }
775
776 if (iser_task->dir[ISER_DIR_OUT]) {
777 iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT);
778 iser_dma_unmap_task_data(iser_task,
779 &iser_task->data[ISER_DIR_OUT],
780 DMA_TO_DEVICE);
781 if (prot_count)
782 iser_dma_unmap_task_data(iser_task,
783 &iser_task->prot[ISER_DIR_OUT],
784 DMA_TO_DEVICE);
785 }
786}
787
