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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 two6 * licenses. You may choose to be licensed under the terms of the GNU7 * General Public License (GPL) Version 2, available from the file8 * COPYING in the main directory of this source tree, or the9 * OpenIB.org BSD license below:10 *11 * Redistribution and use in source and binary forms, with or12 * without modification, are permitted provided that the following13 * conditions are met:14 *15 * - Redistributions of source code must retain the above16 * copyright notice, this list of conditions and the following17 * disclaimer.18 *19 * - Redistributions in binary form must reproduce the above20 * copyright notice, this list of conditions and the following21 * disclaimer in the documentation and/or other materials22 * 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 OF26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE31 * 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 rdma44 * dto descriptor. Data size is stored in45 * task->data[ISER_DIR_IN].data_len, Protection size46 * os stored in task->prot[ISER_DIR_IN].data_len47 */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 56 err = iser_dma_map_task_data(iser_task,57 ISER_DIR_IN,58 DMA_FROM_DEVICE);59 if (err)60 return err;61 62 err = iser_reg_mem_fastreg(iser_task, ISER_DIR_IN, false);63 if (err) {64 iser_err("Failed to set up Data-IN RDMA\n");65 goto out_err;66 }67 mem_reg = &iser_task->rdma_reg[ISER_DIR_IN];68 69 hdr->flags |= ISER_RSV;70 hdr->read_stag = cpu_to_be32(mem_reg->rkey);71 hdr->read_va = cpu_to_be64(mem_reg->sge.addr);72 73 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",74 task->itt, mem_reg->rkey,75 (unsigned long long)mem_reg->sge.addr);76 77 return 0;78 79out_err:80 iser_dma_unmap_task_data(iser_task, ISER_DIR_IN, DMA_FROM_DEVICE);81 return err;82}83 84/* Register user buffer memory and initialize passive rdma85 * dto descriptor. Data size is stored in86 * task->data[ISER_DIR_OUT].data_len, Protection size87 * is stored at task->prot[ISER_DIR_OUT].data_len88 */89static int iser_prepare_write_cmd(struct iscsi_task *task, unsigned int imm_sz,90 unsigned int unsol_sz, unsigned int edtl)91{92 struct iscsi_iser_task *iser_task = task->dd_data;93 struct iser_mem_reg *mem_reg;94 int err;95 struct iser_ctrl *hdr = &iser_task->desc.iser_header;96 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];97 struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];98 99 err = iser_dma_map_task_data(iser_task,100 ISER_DIR_OUT,101 DMA_TO_DEVICE);102 if (err)103 return err;104 105 err = iser_reg_mem_fastreg(iser_task, ISER_DIR_OUT,106 buf_out->data_len == imm_sz);107 if (err) {108 iser_err("Failed to register write cmd RDMA mem\n");109 goto out_err;110 }111 112 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];113 114 if (unsol_sz < edtl) {115 hdr->flags |= ISER_WSV;116 if (buf_out->data_len > imm_sz) {117 hdr->write_stag = cpu_to_be32(mem_reg->rkey);118 hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz);119 }120 121 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X VA:%#llX + unsol:%d\n",122 task->itt, mem_reg->rkey,123 (unsigned long long)mem_reg->sge.addr, unsol_sz);124 }125 126 if (imm_sz > 0) {127 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",128 task->itt, imm_sz);129 tx_dsg->addr = mem_reg->sge.addr;130 tx_dsg->length = imm_sz;131 tx_dsg->lkey = mem_reg->sge.lkey;132 iser_task->desc.num_sge = 2;133 }134 135 return 0;136 137out_err:138 iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT, DMA_TO_DEVICE);139 return err;140}141 142/* creates a new tx descriptor and adds header regd buffer */143static void iser_create_send_desc(struct iser_conn *iser_conn,144 struct iser_tx_desc *tx_desc, enum iser_desc_type type,145 void (*done)(struct ib_cq *cq, struct ib_wc *wc))146{147 struct iser_device *device = iser_conn->ib_conn.device;148 149 tx_desc->type = type;150 tx_desc->cqe.done = done;151 152 ib_dma_sync_single_for_cpu(device->ib_device,153 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);154 155 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));156 tx_desc->iser_header.flags = ISER_VER;157 tx_desc->num_sge = 1;158}159 160static void iser_free_login_buf(struct iser_conn *iser_conn)161{162 struct iser_device *device = iser_conn->ib_conn.device;163 struct iser_login_desc *desc = &iser_conn->login_desc;164 165 if (!desc->req)166 return;167 168 ib_dma_unmap_single(device->ib_device, desc->req_dma,169 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);170 171 ib_dma_unmap_single(device->ib_device, desc->rsp_dma,172 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);173 174 kfree(desc->req);175 kfree(desc->rsp);176 177 /* make sure we never redo any unmapping */178 desc->req = NULL;179 desc->rsp = NULL;180}181 182static int iser_alloc_login_buf(struct iser_conn *iser_conn)183{184 struct iser_device *device = iser_conn->ib_conn.device;185 struct iser_login_desc *desc = &iser_conn->login_desc;186 187 desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);188 if (!desc->req)189 return -ENOMEM;190 191 desc->req_dma = ib_dma_map_single(device->ib_device, desc->req,192 ISCSI_DEF_MAX_RECV_SEG_LEN,193 DMA_TO_DEVICE);194 if (ib_dma_mapping_error(device->ib_device,195 desc->req_dma))196 goto free_req;197 198 desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL);199 if (!desc->rsp)200 goto unmap_req;201 202 desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp,203 ISER_RX_LOGIN_SIZE,204 DMA_FROM_DEVICE);205 if (ib_dma_mapping_error(device->ib_device,206 desc->rsp_dma))207 goto free_rsp;208 209 return 0;210 211free_rsp:212 kfree(desc->rsp);213unmap_req:214 ib_dma_unmap_single(device->ib_device, desc->req_dma,215 ISCSI_DEF_MAX_RECV_SEG_LEN,216 DMA_TO_DEVICE);217free_req:218 kfree(desc->req);219 220 return -ENOMEM;221}222 223int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,224 struct iscsi_session *session)225{226 int i, j;227 u64 dma_addr;228 struct iser_rx_desc *rx_desc;229 struct ib_sge *rx_sg;230 struct ib_conn *ib_conn = &iser_conn->ib_conn;231 struct iser_device *device = ib_conn->device;232 233 iser_conn->qp_max_recv_dtos = session->cmds_max;234 235 if (iser_alloc_fastreg_pool(ib_conn, session->scsi_cmds_max,236 iser_conn->pages_per_mr))237 goto create_rdma_reg_res_failed;238 239 if (iser_alloc_login_buf(iser_conn))240 goto alloc_login_buf_fail;241 242 iser_conn->num_rx_descs = session->cmds_max;243 iser_conn->rx_descs = kmalloc_array(iser_conn->num_rx_descs,244 sizeof(struct iser_rx_desc),245 GFP_KERNEL);246 if (!iser_conn->rx_descs)247 goto rx_desc_alloc_fail;248 249 rx_desc = iser_conn->rx_descs;250 251 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) {252 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,253 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);254 if (ib_dma_mapping_error(device->ib_device, dma_addr))255 goto rx_desc_dma_map_failed;256 257 rx_desc->dma_addr = dma_addr;258 rx_desc->cqe.done = iser_task_rsp;259 rx_sg = &rx_desc->rx_sg;260 rx_sg->addr = rx_desc->dma_addr;261 rx_sg->length = ISER_RX_PAYLOAD_SIZE;262 rx_sg->lkey = device->pd->local_dma_lkey;263 }264 265 return 0;266 267rx_desc_dma_map_failed:268 rx_desc = iser_conn->rx_descs;269 for (j = 0; j < i; j++, rx_desc++)270 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,271 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);272 kfree(iser_conn->rx_descs);273 iser_conn->rx_descs = NULL;274rx_desc_alloc_fail:275 iser_free_login_buf(iser_conn);276alloc_login_buf_fail:277 iser_free_fastreg_pool(ib_conn);278create_rdma_reg_res_failed:279 iser_err("failed allocating rx descriptors / data buffers\n");280 return -ENOMEM;281}282 283void iser_free_rx_descriptors(struct iser_conn *iser_conn)284{285 int i;286 struct iser_rx_desc *rx_desc;287 struct ib_conn *ib_conn = &iser_conn->ib_conn;288 struct iser_device *device = ib_conn->device;289 290 iser_free_fastreg_pool(ib_conn);291 292 rx_desc = iser_conn->rx_descs;293 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)294 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,295 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);296 kfree(iser_conn->rx_descs);297 /* make sure we never redo any unmapping */298 iser_conn->rx_descs = NULL;299 300 iser_free_login_buf(iser_conn);301}302 303static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)304{305 struct iser_conn *iser_conn = conn->dd_data;306 struct iscsi_session *session = conn->session;307 int err = 0;308 int i;309 310 iser_dbg("req op %x flags %x\n", req->opcode, req->flags);311 /* check if this is the last login - going to full feature phase */312 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)313 goto out;314 315 if (session->discovery_sess) {316 iser_info("Discovery session, re-using login RX buffer\n");317 goto out;318 }319 320 iser_info("Normal session, posting batch of RX %d buffers\n",321 iser_conn->qp_max_recv_dtos - 1);322 323 /*324 * Initial post receive buffers.325 * There is one already posted recv buffer (for the last login326 * response). Therefore, the first recv buffer is skipped here.327 */328 for (i = 1; i < iser_conn->qp_max_recv_dtos; i++) {329 err = iser_post_recvm(iser_conn, &iser_conn->rx_descs[i]);330 if (err)331 goto out;332 }333out:334 return err;335}336 337/**338 * iser_send_command - send command PDU339 * @conn: link to matching iscsi connection340 * @task: SCSI command task341 */342int iser_send_command(struct iscsi_conn *conn, struct iscsi_task *task)343{344 struct iser_conn *iser_conn = conn->dd_data;345 struct iscsi_iser_task *iser_task = task->dd_data;346 unsigned long edtl;347 int err;348 struct iser_data_buf *data_buf, *prot_buf;349 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;350 struct scsi_cmnd *sc = task->sc;351 struct iser_tx_desc *tx_desc = &iser_task->desc;352 353 edtl = ntohl(hdr->data_length);354 355 /* build the tx desc regd header and add it to the tx desc dto */356 iser_create_send_desc(iser_conn, tx_desc, ISCSI_TX_SCSI_COMMAND,357 iser_cmd_comp);358 359 if (hdr->flags & ISCSI_FLAG_CMD_READ) {360 data_buf = &iser_task->data[ISER_DIR_IN];361 prot_buf = &iser_task->prot[ISER_DIR_IN];362 } else {363 data_buf = &iser_task->data[ISER_DIR_OUT];364 prot_buf = &iser_task->prot[ISER_DIR_OUT];365 }366 367 if (scsi_sg_count(sc)) { /* using a scatter list */368 data_buf->sg = scsi_sglist(sc);369 data_buf->size = scsi_sg_count(sc);370 }371 data_buf->data_len = scsi_bufflen(sc);372 373 if (scsi_prot_sg_count(sc)) {374 prot_buf->sg = scsi_prot_sglist(sc);375 prot_buf->size = scsi_prot_sg_count(sc);376 prot_buf->data_len = (data_buf->data_len >>377 ilog2(sc->device->sector_size)) * 8;378 }379 380 if (hdr->flags & ISCSI_FLAG_CMD_READ) {381 err = iser_prepare_read_cmd(task);382 if (err)383 goto send_command_error;384 }385 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {386 err = iser_prepare_write_cmd(task,387 task->imm_count,388 task->imm_count +389 task->unsol_r2t.data_length,390 edtl);391 if (err)392 goto send_command_error;393 }394 395 iser_task->status = ISER_TASK_STATUS_STARTED;396 397 err = iser_post_send(&iser_conn->ib_conn, tx_desc);398 if (!err)399 return 0;400 401send_command_error:402 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);403 return err;404}405 406/**407 * iser_send_data_out - send data out PDU408 * @conn: link to matching iscsi connection409 * @task: SCSI command task410 * @hdr: pointer to the LLD's iSCSI message header411 */412int iser_send_data_out(struct iscsi_conn *conn, struct iscsi_task *task,413 struct iscsi_data *hdr)414{415 struct iser_conn *iser_conn = conn->dd_data;416 struct iscsi_iser_task *iser_task = task->dd_data;417 struct iser_tx_desc *tx_desc;418 struct iser_mem_reg *mem_reg;419 unsigned long buf_offset;420 unsigned long data_seg_len;421 uint32_t itt;422 int err;423 struct ib_sge *tx_dsg;424 425 itt = (__force uint32_t)hdr->itt;426 data_seg_len = ntoh24(hdr->dlength);427 buf_offset = ntohl(hdr->offset);428 429 iser_dbg("%s itt %d dseg_len %d offset %d\n",430 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);431 432 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);433 if (!tx_desc)434 return -ENOMEM;435 436 tx_desc->type = ISCSI_TX_DATAOUT;437 tx_desc->cqe.done = iser_dataout_comp;438 tx_desc->iser_header.flags = ISER_VER;439 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));440 441 /* build the tx desc */442 err = iser_initialize_task_headers(task, tx_desc);443 if (err)444 goto send_data_out_error;445 446 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];447 tx_dsg = &tx_desc->tx_sg[1];448 tx_dsg->addr = mem_reg->sge.addr + buf_offset;449 tx_dsg->length = data_seg_len;450 tx_dsg->lkey = mem_reg->sge.lkey;451 tx_desc->num_sge = 2;452 453 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {454 iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n",455 buf_offset, data_seg_len,456 iser_task->data[ISER_DIR_OUT].data_len, itt);457 err = -EINVAL;458 goto send_data_out_error;459 }460 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",461 itt, buf_offset, data_seg_len);462 463 err = iser_post_send(&iser_conn->ib_conn, tx_desc);464 if (!err)465 return 0;466 467send_data_out_error:468 kmem_cache_free(ig.desc_cache, tx_desc);469 iser_err("conn %p failed err %d\n", conn, err);470 return err;471}472 473int iser_send_control(struct iscsi_conn *conn, struct iscsi_task *task)474{475 struct iser_conn *iser_conn = conn->dd_data;476 struct iscsi_iser_task *iser_task = task->dd_data;477 struct iser_tx_desc *mdesc = &iser_task->desc;478 unsigned long data_seg_len;479 int err = 0;480 struct iser_device *device;481 482 /* build the tx desc regd header and add it to the tx desc dto */483 iser_create_send_desc(iser_conn, mdesc, ISCSI_TX_CONTROL,484 iser_ctrl_comp);485 486 device = iser_conn->ib_conn.device;487 488 data_seg_len = ntoh24(task->hdr->dlength);489 490 if (data_seg_len > 0) {491 struct iser_login_desc *desc = &iser_conn->login_desc;492 struct ib_sge *tx_dsg = &mdesc->tx_sg[1];493 494 if (task != conn->login_task) {495 iser_err("data present on non login task!!!\n");496 goto send_control_error;497 }498 499 ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma,500 task->data_count, DMA_TO_DEVICE);501 502 memcpy(desc->req, task->data, task->data_count);503 504 ib_dma_sync_single_for_device(device->ib_device, desc->req_dma,505 task->data_count, DMA_TO_DEVICE);506 507 tx_dsg->addr = desc->req_dma;508 tx_dsg->length = task->data_count;509 tx_dsg->lkey = device->pd->local_dma_lkey;510 mdesc->num_sge = 2;511 }512 513 if (task == conn->login_task) {514 iser_dbg("op %x dsl %lx, posting login rx buffer\n",515 task->hdr->opcode, data_seg_len);516 err = iser_post_recvl(iser_conn);517 if (err)518 goto send_control_error;519 err = iser_post_rx_bufs(conn, task->hdr);520 if (err)521 goto send_control_error;522 }523 524 err = iser_post_send(&iser_conn->ib_conn, mdesc);525 if (!err)526 return 0;527 528send_control_error:529 iser_err("conn %p failed err %d\n",conn, err);530 return err;531}532 533void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc)534{535 struct ib_conn *ib_conn = wc->qp->qp_context;536 struct iser_conn *iser_conn = to_iser_conn(ib_conn);537 struct iser_login_desc *desc = iser_login(wc->wr_cqe);538 struct iscsi_hdr *hdr;539 char *data;540 int length;541 bool full_feature_phase;542 543 if (unlikely(wc->status != IB_WC_SUCCESS)) {544 iser_err_comp(wc, "login_rsp");545 return;546 }547 548 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,549 desc->rsp_dma, ISER_RX_LOGIN_SIZE,550 DMA_FROM_DEVICE);551 552 hdr = desc->rsp + sizeof(struct iser_ctrl);553 data = desc->rsp + ISER_HEADERS_LEN;554 length = wc->byte_len - ISER_HEADERS_LEN;555 full_feature_phase = ((hdr->flags & ISCSI_FULL_FEATURE_PHASE) ==556 ISCSI_FULL_FEATURE_PHASE) &&557 (hdr->flags & ISCSI_FLAG_CMD_FINAL);558 559 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,560 hdr->itt, length);561 562 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length);563 564 ib_dma_sync_single_for_device(ib_conn->device->ib_device,565 desc->rsp_dma, ISER_RX_LOGIN_SIZE,566 DMA_FROM_DEVICE);567 568 if (!full_feature_phase ||569 iser_conn->iscsi_conn->session->discovery_sess)570 return;571 572 /* Post the first RX buffer that is skipped in iser_post_rx_bufs() */573 iser_post_recvm(iser_conn, iser_conn->rx_descs);574}575 576static inline int iser_inv_desc(struct iser_fr_desc *desc, u32 rkey)577{578 if (unlikely((!desc->sig_protected && rkey != desc->rsc.mr->rkey) ||579 (desc->sig_protected && rkey != desc->rsc.sig_mr->rkey))) {580 iser_err("Bogus remote invalidation for rkey %#x\n", rkey);581 return -EINVAL;582 }583 584 if (desc->sig_protected)585 desc->rsc.sig_mr->need_inval = false;586 else587 desc->rsc.mr->need_inval = false;588 589 return 0;590}591 592static int iser_check_remote_inv(struct iser_conn *iser_conn, struct ib_wc *wc,593 struct iscsi_hdr *hdr)594{595 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {596 struct iscsi_task *task;597 u32 rkey = wc->ex.invalidate_rkey;598 599 iser_dbg("conn %p: remote invalidation for rkey %#x\n",600 iser_conn, rkey);601 602 if (unlikely(!iser_conn->snd_w_inv)) {603 iser_err("conn %p: unexpected remote invalidation, terminating connection\n",604 iser_conn);605 return -EPROTO;606 }607 608 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt);609 if (likely(task)) {610 struct iscsi_iser_task *iser_task = task->dd_data;611 struct iser_fr_desc *desc;612 613 if (iser_task->dir[ISER_DIR_IN]) {614 desc = iser_task->rdma_reg[ISER_DIR_IN].desc;615 if (unlikely(iser_inv_desc(desc, rkey)))616 return -EINVAL;617 }618 619 if (iser_task->dir[ISER_DIR_OUT]) {620 desc = iser_task->rdma_reg[ISER_DIR_OUT].desc;621 if (unlikely(iser_inv_desc(desc, rkey)))622 return -EINVAL;623 }624 } else {625 iser_err("failed to get task for itt=%d\n", hdr->itt);626 return -EINVAL;627 }628 }629 630 return 0;631}632 633 634void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc)635{636 struct ib_conn *ib_conn = wc->qp->qp_context;637 struct iser_conn *iser_conn = to_iser_conn(ib_conn);638 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe);639 struct iscsi_hdr *hdr;640 int length, err;641 642 if (unlikely(wc->status != IB_WC_SUCCESS)) {643 iser_err_comp(wc, "task_rsp");644 return;645 }646 647 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,648 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,649 DMA_FROM_DEVICE);650 651 hdr = &desc->iscsi_header;652 length = wc->byte_len - ISER_HEADERS_LEN;653 654 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,655 hdr->itt, length);656 657 if (iser_check_remote_inv(iser_conn, wc, hdr)) {658 iscsi_conn_failure(iser_conn->iscsi_conn,659 ISCSI_ERR_CONN_FAILED);660 return;661 }662 663 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length);664 665 ib_dma_sync_single_for_device(ib_conn->device->ib_device,666 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,667 DMA_FROM_DEVICE);668 669 err = iser_post_recvm(iser_conn, desc);670 if (err)671 iser_err("posting rx buffer err %d\n", err);672}673 674void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc)675{676 if (unlikely(wc->status != IB_WC_SUCCESS))677 iser_err_comp(wc, "command");678}679 680void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc)681{682 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);683 struct iscsi_task *task;684 685 if (unlikely(wc->status != IB_WC_SUCCESS)) {686 iser_err_comp(wc, "control");687 return;688 }689 690 /* this arithmetic is legal by libiscsi dd_data allocation */691 task = (void *)desc - sizeof(struct iscsi_task);692 if (task->hdr->itt == RESERVED_ITT)693 iscsi_put_task(task);694}695 696void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc)697{698 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);699 struct ib_conn *ib_conn = wc->qp->qp_context;700 struct iser_device *device = ib_conn->device;701 702 if (unlikely(wc->status != IB_WC_SUCCESS))703 iser_err_comp(wc, "dataout");704 705 ib_dma_unmap_single(device->ib_device, desc->dma_addr,706 ISER_HEADERS_LEN, DMA_TO_DEVICE);707 kmem_cache_free(ig.desc_cache, desc);708}709 710void iser_task_rdma_init(struct iscsi_iser_task *iser_task)711 712{713 iser_task->status = ISER_TASK_STATUS_INIT;714 715 iser_task->dir[ISER_DIR_IN] = 0;716 iser_task->dir[ISER_DIR_OUT] = 0;717 718 iser_task->data[ISER_DIR_IN].data_len = 0;719 iser_task->data[ISER_DIR_OUT].data_len = 0;720 721 iser_task->prot[ISER_DIR_IN].data_len = 0;722 iser_task->prot[ISER_DIR_OUT].data_len = 0;723 724 iser_task->prot[ISER_DIR_IN].dma_nents = 0;725 iser_task->prot[ISER_DIR_OUT].dma_nents = 0;726 727 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0,728 sizeof(struct iser_mem_reg));729 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,730 sizeof(struct iser_mem_reg));731}732 733void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)734{735 736 if (iser_task->dir[ISER_DIR_IN]) {737 iser_unreg_mem_fastreg(iser_task, ISER_DIR_IN);738 iser_dma_unmap_task_data(iser_task, ISER_DIR_IN,739 DMA_FROM_DEVICE);740 }741 742 if (iser_task->dir[ISER_DIR_OUT]) {743 iser_unreg_mem_fastreg(iser_task, ISER_DIR_OUT);744 iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT,745 DMA_TO_DEVICE);746 }747}748