2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
33 #include <linux/kernel.h>
34 #include <linux/slab.h>
36 #include <linux/scatterlist.h>
37 #include <linux/kfifo.h>
38 #include <scsi/scsi_cmnd.h>
39 #include <scsi/scsi_host.h>
41 #include "iscsi_iser.h"
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
48 static int iser_prepare_read_cmd(struct iscsi_task *task)
51 struct iscsi_iser_task *iser_task = task->dd_data;
52 struct iser_mem_reg *mem_reg;
54 struct iser_ctrl *hdr = &iser_task->desc.iser_header;
55 struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN];
57 err = iser_dma_map_task_data(iser_task,
64 if (scsi_prot_sg_count(iser_task->sc)) {
65 struct iser_data_buf *pbuf_in = &iser_task->prot[ISER_DIR_IN];
67 err = iser_dma_map_task_data(iser_task,
75 err = iser_reg_rdma_mem(iser_task, ISER_DIR_IN, false);
77 iser_err("Failed to set up Data-IN RDMA\n");
80 mem_reg = &iser_task->rdma_reg[ISER_DIR_IN];
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);
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);
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
99 iser_prepare_write_cmd(struct iscsi_task *task,
101 unsigned int unsol_sz,
104 struct iscsi_iser_task *iser_task = task->dd_data;
105 struct iser_mem_reg *mem_reg;
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];
111 err = iser_dma_map_task_data(iser_task,
118 if (scsi_prot_sg_count(iser_task->sc)) {
119 struct iser_data_buf *pbuf_out = &iser_task->prot[ISER_DIR_OUT];
121 err = iser_dma_map_task_data(iser_task,
129 err = iser_reg_rdma_mem(iser_task, ISER_DIR_OUT,
130 buf_out->data_len == imm_sz);
132 iser_err("Failed to register write cmd RDMA mem\n");
136 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
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);
145 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X "
146 "VA:%#llX + unsol:%d\n",
147 task->itt, mem_reg->rkey,
148 (unsigned long long)mem_reg->sge.addr, unsol_sz);
152 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
154 tx_dsg->addr = mem_reg->sge.addr;
155 tx_dsg->length = imm_sz;
156 tx_dsg->lkey = mem_reg->sge.lkey;
157 iser_task->desc.num_sge = 2;
163 /* creates a new tx descriptor and adds header regd buffer */
164 static void iser_create_send_desc(struct iser_conn *iser_conn,
165 struct iser_tx_desc *tx_desc)
167 struct iser_device *device = iser_conn->ib_conn.device;
169 ib_dma_sync_single_for_cpu(device->ib_device,
170 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
172 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
173 tx_desc->iser_header.flags = ISER_VER;
174 tx_desc->num_sge = 1;
177 static void iser_free_login_buf(struct iser_conn *iser_conn)
179 struct iser_device *device = iser_conn->ib_conn.device;
180 struct iser_login_desc *desc = &iser_conn->login_desc;
185 ib_dma_unmap_single(device->ib_device, desc->req_dma,
186 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
188 ib_dma_unmap_single(device->ib_device, desc->rsp_dma,
189 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
194 /* make sure we never redo any unmapping */
199 static int iser_alloc_login_buf(struct iser_conn *iser_conn)
201 struct iser_device *device = iser_conn->ib_conn.device;
202 struct iser_login_desc *desc = &iser_conn->login_desc;
204 desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
208 desc->req_dma = ib_dma_map_single(device->ib_device, desc->req,
209 ISCSI_DEF_MAX_RECV_SEG_LEN,
211 if (ib_dma_mapping_error(device->ib_device,
215 desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL);
219 desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp,
222 if (ib_dma_mapping_error(device->ib_device,
231 ib_dma_unmap_single(device->ib_device, desc->req_dma,
232 ISCSI_DEF_MAX_RECV_SEG_LEN,
240 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
241 struct iscsi_session *session)
245 struct iser_rx_desc *rx_desc;
246 struct ib_sge *rx_sg;
247 struct ib_conn *ib_conn = &iser_conn->ib_conn;
248 struct iser_device *device = ib_conn->device;
250 iser_conn->qp_max_recv_dtos = session->cmds_max;
251 iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */
252 iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2;
254 if (device->reg_ops->alloc_reg_res(ib_conn, session->scsi_cmds_max,
255 iser_conn->scsi_sg_tablesize))
256 goto create_rdma_reg_res_failed;
258 if (iser_alloc_login_buf(iser_conn))
259 goto alloc_login_buf_fail;
261 iser_conn->num_rx_descs = session->cmds_max;
262 iser_conn->rx_descs = kmalloc(iser_conn->num_rx_descs *
263 sizeof(struct iser_rx_desc), GFP_KERNEL);
264 if (!iser_conn->rx_descs)
265 goto rx_desc_alloc_fail;
267 rx_desc = iser_conn->rx_descs;
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;
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;
283 iser_conn->rx_desc_head = 0;
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;
294 iser_free_login_buf(iser_conn);
295 alloc_login_buf_fail:
296 device->reg_ops->free_reg_res(ib_conn);
297 create_rdma_reg_res_failed:
298 iser_err("failed allocating rx descriptors / data buffers\n");
302 void iser_free_rx_descriptors(struct iser_conn *iser_conn)
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;
309 if (device->reg_ops->free_reg_res)
310 device->reg_ops->free_reg_res(ib_conn);
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 /* make sure we never redo any unmapping */
318 iser_conn->rx_descs = NULL;
320 iser_free_login_buf(iser_conn);
323 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
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;
329 iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
330 /* check if this is the last login - going to full feature phase */
331 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
335 * Check that there is one posted recv buffer
336 * (for the last login response).
338 WARN_ON(ib_conn->post_recv_buf_count != 1);
340 if (session->discovery_sess) {
341 iser_info("Discovery session, re-using login RX buffer\n");
344 iser_info("Normal session, posting batch of RX %d buffers\n",
345 iser_conn->min_posted_rx);
347 /* Initial post receive buffers */
348 if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx))
354 static inline bool iser_signal_comp(u8 sig_count)
356 return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0);
360 * iser_send_command - send command PDU
362 int iser_send_command(struct iscsi_conn *conn,
363 struct iscsi_task *task)
365 struct iser_conn *iser_conn = conn->dd_data;
366 struct iscsi_iser_task *iser_task = task->dd_data;
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;
375 edtl = ntohl(hdr->data_length);
377 /* build the tx desc regd header and add it to the tx desc dto */
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);
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];
386 data_buf = &iser_task->data[ISER_DIR_OUT];
387 prot_buf = &iser_task->prot[ISER_DIR_OUT];
390 if (scsi_sg_count(sc)) { /* using a scatter list */
391 data_buf->sg = scsi_sglist(sc);
392 data_buf->size = scsi_sg_count(sc);
394 data_buf->data_len = scsi_bufflen(sc);
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;
403 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
404 err = iser_prepare_read_cmd(task);
406 goto send_command_error;
408 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
409 err = iser_prepare_write_cmd(task,
412 task->unsol_r2t.data_length,
415 goto send_command_error;
418 iser_task->status = ISER_TASK_STATUS_STARTED;
420 err = iser_post_send(&iser_conn->ib_conn, tx_desc,
421 iser_signal_comp(sig_count));
426 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
431 * iser_send_data_out - send data out PDU
433 int iser_send_data_out(struct iscsi_conn *conn,
434 struct iscsi_task *task,
435 struct iscsi_data *hdr)
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 = NULL;
440 struct iser_mem_reg *mem_reg;
441 unsigned long buf_offset;
442 unsigned long data_seg_len;
445 struct ib_sge *tx_dsg;
447 itt = (__force uint32_t)hdr->itt;
448 data_seg_len = ntoh24(hdr->dlength);
449 buf_offset = ntohl(hdr->offset);
451 iser_dbg("%s itt %d dseg_len %d offset %d\n",
452 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
454 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
455 if (tx_desc == NULL) {
456 iser_err("Failed to alloc desc for post dataout\n");
460 tx_desc->type = ISCSI_TX_DATAOUT;
461 tx_desc->cqe.done = iser_dataout_comp;
462 tx_desc->iser_header.flags = ISER_VER;
463 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
465 /* build the tx desc */
466 err = iser_initialize_task_headers(task, tx_desc);
468 goto send_data_out_error;
470 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
471 tx_dsg = &tx_desc->tx_sg[1];
472 tx_dsg->addr = mem_reg->sge.addr + buf_offset;
473 tx_dsg->length = data_seg_len;
474 tx_dsg->lkey = mem_reg->sge.lkey;
475 tx_desc->num_sge = 2;
477 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
478 iser_err("Offset:%ld & DSL:%ld in Data-Out "
479 "inconsistent with total len:%ld, itt:%d\n",
480 buf_offset, data_seg_len,
481 iser_task->data[ISER_DIR_OUT].data_len, itt);
483 goto send_data_out_error;
485 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
486 itt, buf_offset, data_seg_len);
489 err = iser_post_send(&iser_conn->ib_conn, tx_desc, true);
494 kmem_cache_free(ig.desc_cache, tx_desc);
495 iser_err("conn %p failed err %d\n", conn, err);
499 int iser_send_control(struct iscsi_conn *conn,
500 struct iscsi_task *task)
502 struct iser_conn *iser_conn = conn->dd_data;
503 struct iscsi_iser_task *iser_task = task->dd_data;
504 struct iser_tx_desc *mdesc = &iser_task->desc;
505 unsigned long data_seg_len;
507 struct iser_device *device;
509 /* build the tx desc regd header and add it to the tx desc dto */
510 mdesc->type = ISCSI_TX_CONTROL;
511 mdesc->cqe.done = iser_ctrl_comp;
512 iser_create_send_desc(iser_conn, mdesc);
514 device = iser_conn->ib_conn.device;
516 data_seg_len = ntoh24(task->hdr->dlength);
518 if (data_seg_len > 0) {
519 struct iser_login_desc *desc = &iser_conn->login_desc;
520 struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
522 if (task != conn->login_task) {
523 iser_err("data present on non login task!!!\n");
524 goto send_control_error;
527 ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma,
528 task->data_count, DMA_TO_DEVICE);
530 memcpy(desc->req, task->data, task->data_count);
532 ib_dma_sync_single_for_device(device->ib_device, desc->req_dma,
533 task->data_count, DMA_TO_DEVICE);
535 tx_dsg->addr = desc->req_dma;
536 tx_dsg->length = task->data_count;
537 tx_dsg->lkey = device->pd->local_dma_lkey;
541 if (task == conn->login_task) {
542 iser_dbg("op %x dsl %lx, posting login rx buffer\n",
543 task->hdr->opcode, data_seg_len);
544 err = iser_post_recvl(iser_conn);
546 goto send_control_error;
547 err = iser_post_rx_bufs(conn, task->hdr);
549 goto send_control_error;
552 err = iser_post_send(&iser_conn->ib_conn, mdesc, true);
557 iser_err("conn %p failed err %d\n",conn, err);
561 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc)
563 struct ib_conn *ib_conn = wc->qp->qp_context;
564 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
565 struct iser_login_desc *desc = iser_login(wc->wr_cqe);
566 struct iscsi_hdr *hdr;
570 if (unlikely(wc->status != IB_WC_SUCCESS)) {
571 iser_err_comp(wc, "login_rsp");
575 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
576 desc->rsp_dma, ISER_RX_LOGIN_SIZE,
579 hdr = desc->rsp + sizeof(struct iser_ctrl);
580 data = desc->rsp + ISER_HEADERS_LEN;
581 length = wc->byte_len - ISER_HEADERS_LEN;
583 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
586 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length);
588 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
589 desc->rsp_dma, ISER_RX_LOGIN_SIZE,
592 ib_conn->post_recv_buf_count--;
596 iser_inv_desc(struct iser_fr_desc *desc, u32 rkey)
598 if (likely(rkey == desc->rsc.mr->rkey))
599 desc->rsc.mr_valid = 0;
600 else if (likely(rkey == desc->pi_ctx->sig_mr->rkey))
601 desc->pi_ctx->sig_mr_valid = 0;
605 iser_check_remote_inv(struct iser_conn *iser_conn,
607 struct iscsi_hdr *hdr)
609 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
610 struct iscsi_task *task;
611 u32 rkey = wc->ex.invalidate_rkey;
613 iser_dbg("conn %p: remote invalidation for rkey %#x\n",
616 if (unlikely(!iser_conn->snd_w_inv)) {
617 iser_err("conn %p: unexpected remote invalidation, "
618 "terminating connection\n", iser_conn);
622 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt);
624 struct iscsi_iser_task *iser_task = task->dd_data;
625 struct iser_fr_desc *desc;
627 if (iser_task->dir[ISER_DIR_IN]) {
628 desc = iser_task->rdma_reg[ISER_DIR_IN].mem_h;
629 iser_inv_desc(desc, rkey);
632 if (iser_task->dir[ISER_DIR_OUT]) {
633 desc = iser_task->rdma_reg[ISER_DIR_OUT].mem_h;
634 iser_inv_desc(desc, rkey);
637 iser_err("failed to get task for itt=%d\n", hdr->itt);
646 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc)
648 struct ib_conn *ib_conn = wc->qp->qp_context;
649 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
650 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe);
651 struct iscsi_hdr *hdr;
653 int outstanding, count, err;
655 if (unlikely(wc->status != IB_WC_SUCCESS)) {
656 iser_err_comp(wc, "task_rsp");
660 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
661 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
664 hdr = &desc->iscsi_header;
665 length = wc->byte_len - ISER_HEADERS_LEN;
667 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
670 if (iser_check_remote_inv(iser_conn, wc, hdr)) {
671 iscsi_conn_failure(iser_conn->iscsi_conn,
672 ISCSI_ERR_CONN_FAILED);
676 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length);
678 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
679 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
682 /* decrementing conn->post_recv_buf_count only --after-- freeing the *
683 * task eliminates the need to worry on tasks which are completed in *
684 * parallel to the execution of iser_conn_term. So the code that waits *
685 * for the posted rx bufs refcount to become zero handles everything */
686 ib_conn->post_recv_buf_count--;
688 outstanding = ib_conn->post_recv_buf_count;
689 if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) {
690 count = min(iser_conn->qp_max_recv_dtos - outstanding,
691 iser_conn->min_posted_rx);
692 err = iser_post_recvm(iser_conn, count);
694 iser_err("posting %d rx bufs err %d\n", count, err);
698 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc)
700 if (unlikely(wc->status != IB_WC_SUCCESS))
701 iser_err_comp(wc, "command");
704 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc)
706 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
707 struct iscsi_task *task;
709 if (unlikely(wc->status != IB_WC_SUCCESS)) {
710 iser_err_comp(wc, "control");
714 /* this arithmetic is legal by libiscsi dd_data allocation */
715 task = (void *)desc - sizeof(struct iscsi_task);
716 if (task->hdr->itt == RESERVED_ITT)
717 iscsi_put_task(task);
720 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc)
722 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
723 struct ib_conn *ib_conn = wc->qp->qp_context;
724 struct iser_device *device = ib_conn->device;
726 if (unlikely(wc->status != IB_WC_SUCCESS))
727 iser_err_comp(wc, "dataout");
729 ib_dma_unmap_single(device->ib_device, desc->dma_addr,
730 ISER_HEADERS_LEN, DMA_TO_DEVICE);
731 kmem_cache_free(ig.desc_cache, desc);
734 void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
737 iser_task->status = ISER_TASK_STATUS_INIT;
739 iser_task->dir[ISER_DIR_IN] = 0;
740 iser_task->dir[ISER_DIR_OUT] = 0;
742 iser_task->data[ISER_DIR_IN].data_len = 0;
743 iser_task->data[ISER_DIR_OUT].data_len = 0;
745 iser_task->prot[ISER_DIR_IN].data_len = 0;
746 iser_task->prot[ISER_DIR_OUT].data_len = 0;
748 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0,
749 sizeof(struct iser_mem_reg));
750 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,
751 sizeof(struct iser_mem_reg));
754 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
756 int prot_count = scsi_prot_sg_count(iser_task->sc);
758 if (iser_task->dir[ISER_DIR_IN]) {
759 iser_unreg_rdma_mem(iser_task, ISER_DIR_IN);
760 iser_dma_unmap_task_data(iser_task,
761 &iser_task->data[ISER_DIR_IN],
764 iser_dma_unmap_task_data(iser_task,
765 &iser_task->prot[ISER_DIR_IN],
769 if (iser_task->dir[ISER_DIR_OUT]) {
770 iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT);
771 iser_dma_unmap_task_data(iser_task,
772 &iser_task->data[ISER_DIR_OUT],
775 iser_dma_unmap_task_data(iser_task,
776 &iser_task->prot[ISER_DIR_OUT],