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OSCL-LXR
 
 

     

0001 /*
0002  * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
0003  * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
0004  *
0005  * This software is available to you under a choice of one of two
0006  * licenses.  You may choose to be licensed under the terms of the GNU
0007  * General Public License (GPL) Version 2, available from the file
0008  * COPYING in the main directory of this source tree, or the
0009  * OpenIB.org BSD license below:
0010  *
0011  *     Redistribution and use in source and binary forms, with or
0012  *     without modification, are permitted provided that the following
0013  *     conditions are met:
0014  *
0015  *  - Redistributions of source code must retain the above
0016  *    copyright notice, this list of conditions and the following
0017  *    disclaimer.
0018  *
0019  *  - Redistributions in binary form must reproduce the above
0020  *    copyright notice, this list of conditions and the following
0021  *    disclaimer in the documentation and/or other materials
0022  *    provided with the distribution.
0023  *
0024  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
0025  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
0026  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
0027  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
0028  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
0029  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
0030  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0031  * SOFTWARE.
0032  */
0033 #include <linux/kernel.h>
0034 #include <linux/slab.h>
0035 #include <linux/mm.h>
0036 #include <linux/scatterlist.h>
0037 #include <linux/kfifo.h>
0038 #include <scsi/scsi_cmnd.h>
0039 #include <scsi/scsi_host.h>
0040 
0041 #include "iscsi_iser.h"
0042 
0043 /* Register user buffer memory and initialize passive rdma
0044  *  dto descriptor. Data size is stored in
0045  *  task->data[ISER_DIR_IN].data_len, Protection size
0046  *  os stored in task->prot[ISER_DIR_IN].data_len
0047  */
0048 static int iser_prepare_read_cmd(struct iscsi_task *task)
0049 
0050 {
0051     struct iscsi_iser_task *iser_task = task->dd_data;
0052     struct iser_mem_reg *mem_reg;
0053     int err;
0054     struct iser_ctrl *hdr = &iser_task->desc.iser_header;
0055 
0056     err = iser_dma_map_task_data(iser_task,
0057                      ISER_DIR_IN,
0058                      DMA_FROM_DEVICE);
0059     if (err)
0060         return err;
0061 
0062     err = iser_reg_mem_fastreg(iser_task, ISER_DIR_IN, false);
0063     if (err) {
0064         iser_err("Failed to set up Data-IN RDMA\n");
0065         goto out_err;
0066     }
0067     mem_reg = &iser_task->rdma_reg[ISER_DIR_IN];
0068 
0069     hdr->flags    |= ISER_RSV;
0070     hdr->read_stag = cpu_to_be32(mem_reg->rkey);
0071     hdr->read_va   = cpu_to_be64(mem_reg->sge.addr);
0072 
0073     iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
0074          task->itt, mem_reg->rkey,
0075          (unsigned long long)mem_reg->sge.addr);
0076 
0077     return 0;
0078 
0079 out_err:
0080     iser_dma_unmap_task_data(iser_task, ISER_DIR_IN, DMA_FROM_DEVICE);
0081     return err;
0082 }
0083 
0084 /* Register user buffer memory and initialize passive rdma
0085  *  dto descriptor. Data size is stored in
0086  *  task->data[ISER_DIR_OUT].data_len, Protection size
0087  *  is stored at task->prot[ISER_DIR_OUT].data_len
0088  */
0089 static int iser_prepare_write_cmd(struct iscsi_task *task, unsigned int imm_sz,
0090                   unsigned int unsol_sz, unsigned int edtl)
0091 {
0092     struct iscsi_iser_task *iser_task = task->dd_data;
0093     struct iser_mem_reg *mem_reg;
0094     int err;
0095     struct iser_ctrl *hdr = &iser_task->desc.iser_header;
0096     struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
0097     struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
0098 
0099     err = iser_dma_map_task_data(iser_task,
0100                      ISER_DIR_OUT,
0101                      DMA_TO_DEVICE);
0102     if (err)
0103         return err;
0104 
0105     err = iser_reg_mem_fastreg(iser_task, ISER_DIR_OUT,
0106                    buf_out->data_len == imm_sz);
0107     if (err) {
0108         iser_err("Failed to register write cmd RDMA mem\n");
0109         goto out_err;
0110     }
0111 
0112     mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
0113 
0114     if (unsol_sz < edtl) {
0115         hdr->flags     |= ISER_WSV;
0116         if (buf_out->data_len > imm_sz) {
0117             hdr->write_stag = cpu_to_be32(mem_reg->rkey);
0118             hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz);
0119         }
0120 
0121         iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X VA:%#llX + unsol:%d\n",
0122              task->itt, mem_reg->rkey,
0123              (unsigned long long)mem_reg->sge.addr, unsol_sz);
0124     }
0125 
0126     if (imm_sz > 0) {
0127         iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
0128              task->itt, imm_sz);
0129         tx_dsg->addr = mem_reg->sge.addr;
0130         tx_dsg->length = imm_sz;
0131         tx_dsg->lkey = mem_reg->sge.lkey;
0132         iser_task->desc.num_sge = 2;
0133     }
0134 
0135     return 0;
0136 
0137 out_err:
0138     iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT, DMA_TO_DEVICE);
0139     return err;
0140 }
0141 
0142 /* creates a new tx descriptor and adds header regd buffer */
0143 static void iser_create_send_desc(struct iser_conn *iser_conn,
0144                   struct iser_tx_desc *tx_desc)
0145 {
0146     struct iser_device *device = iser_conn->ib_conn.device;
0147 
0148     ib_dma_sync_single_for_cpu(device->ib_device,
0149         tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
0150 
0151     memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
0152     tx_desc->iser_header.flags = ISER_VER;
0153     tx_desc->num_sge = 1;
0154 }
0155 
0156 static void iser_free_login_buf(struct iser_conn *iser_conn)
0157 {
0158     struct iser_device *device = iser_conn->ib_conn.device;
0159     struct iser_login_desc *desc = &iser_conn->login_desc;
0160 
0161     if (!desc->req)
0162         return;
0163 
0164     ib_dma_unmap_single(device->ib_device, desc->req_dma,
0165                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
0166 
0167     ib_dma_unmap_single(device->ib_device, desc->rsp_dma,
0168                 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
0169 
0170     kfree(desc->req);
0171     kfree(desc->rsp);
0172 
0173     /* make sure we never redo any unmapping */
0174     desc->req = NULL;
0175     desc->rsp = NULL;
0176 }
0177 
0178 static int iser_alloc_login_buf(struct iser_conn *iser_conn)
0179 {
0180     struct iser_device *device = iser_conn->ib_conn.device;
0181     struct iser_login_desc *desc = &iser_conn->login_desc;
0182 
0183     desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
0184     if (!desc->req)
0185         return -ENOMEM;
0186 
0187     desc->req_dma = ib_dma_map_single(device->ib_device, desc->req,
0188                       ISCSI_DEF_MAX_RECV_SEG_LEN,
0189                       DMA_TO_DEVICE);
0190     if (ib_dma_mapping_error(device->ib_device,
0191                 desc->req_dma))
0192         goto free_req;
0193 
0194     desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL);
0195     if (!desc->rsp)
0196         goto unmap_req;
0197 
0198     desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp,
0199                        ISER_RX_LOGIN_SIZE,
0200                        DMA_FROM_DEVICE);
0201     if (ib_dma_mapping_error(device->ib_device,
0202                 desc->rsp_dma))
0203         goto free_rsp;
0204 
0205     return 0;
0206 
0207 free_rsp:
0208     kfree(desc->rsp);
0209 unmap_req:
0210     ib_dma_unmap_single(device->ib_device, desc->req_dma,
0211                 ISCSI_DEF_MAX_RECV_SEG_LEN,
0212                 DMA_TO_DEVICE);
0213 free_req:
0214     kfree(desc->req);
0215 
0216     return -ENOMEM;
0217 }
0218 
0219 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
0220                   struct iscsi_session *session)
0221 {
0222     int i, j;
0223     u64 dma_addr;
0224     struct iser_rx_desc *rx_desc;
0225     struct ib_sge       *rx_sg;
0226     struct ib_conn *ib_conn = &iser_conn->ib_conn;
0227     struct iser_device *device = ib_conn->device;
0228 
0229     iser_conn->qp_max_recv_dtos = session->cmds_max;
0230 
0231     if (iser_alloc_fastreg_pool(ib_conn, session->scsi_cmds_max,
0232                     iser_conn->pages_per_mr))
0233         goto create_rdma_reg_res_failed;
0234 
0235     if (iser_alloc_login_buf(iser_conn))
0236         goto alloc_login_buf_fail;
0237 
0238     iser_conn->num_rx_descs = session->cmds_max;
0239     iser_conn->rx_descs = kmalloc_array(iser_conn->num_rx_descs,
0240                         sizeof(struct iser_rx_desc),
0241                         GFP_KERNEL);
0242     if (!iser_conn->rx_descs)
0243         goto rx_desc_alloc_fail;
0244 
0245     rx_desc = iser_conn->rx_descs;
0246 
0247     for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)  {
0248         dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
0249                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
0250         if (ib_dma_mapping_error(device->ib_device, dma_addr))
0251             goto rx_desc_dma_map_failed;
0252 
0253         rx_desc->dma_addr = dma_addr;
0254         rx_desc->cqe.done = iser_task_rsp;
0255         rx_sg = &rx_desc->rx_sg;
0256         rx_sg->addr = rx_desc->dma_addr;
0257         rx_sg->length = ISER_RX_PAYLOAD_SIZE;
0258         rx_sg->lkey = device->pd->local_dma_lkey;
0259     }
0260 
0261     return 0;
0262 
0263 rx_desc_dma_map_failed:
0264     rx_desc = iser_conn->rx_descs;
0265     for (j = 0; j < i; j++, rx_desc++)
0266         ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
0267                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
0268     kfree(iser_conn->rx_descs);
0269     iser_conn->rx_descs = NULL;
0270 rx_desc_alloc_fail:
0271     iser_free_login_buf(iser_conn);
0272 alloc_login_buf_fail:
0273     iser_free_fastreg_pool(ib_conn);
0274 create_rdma_reg_res_failed:
0275     iser_err("failed allocating rx descriptors / data buffers\n");
0276     return -ENOMEM;
0277 }
0278 
0279 void iser_free_rx_descriptors(struct iser_conn *iser_conn)
0280 {
0281     int i;
0282     struct iser_rx_desc *rx_desc;
0283     struct ib_conn *ib_conn = &iser_conn->ib_conn;
0284     struct iser_device *device = ib_conn->device;
0285 
0286     iser_free_fastreg_pool(ib_conn);
0287 
0288     rx_desc = iser_conn->rx_descs;
0289     for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)
0290         ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
0291                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
0292     kfree(iser_conn->rx_descs);
0293     /* make sure we never redo any unmapping */
0294     iser_conn->rx_descs = NULL;
0295 
0296     iser_free_login_buf(iser_conn);
0297 }
0298 
0299 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
0300 {
0301     struct iser_conn *iser_conn = conn->dd_data;
0302     struct iscsi_session *session = conn->session;
0303     int err = 0;
0304     int i;
0305 
0306     iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
0307     /* check if this is the last login - going to full feature phase */
0308     if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
0309         goto out;
0310 
0311     if (session->discovery_sess) {
0312         iser_info("Discovery session, re-using login RX buffer\n");
0313         goto out;
0314     }
0315 
0316     iser_info("Normal session, posting batch of RX %d buffers\n",
0317           iser_conn->qp_max_recv_dtos - 1);
0318 
0319     /*
0320      * Initial post receive buffers.
0321      * There is one already posted recv buffer (for the last login
0322      * response). Therefore, the first recv buffer is skipped here.
0323      */
0324     for (i = 1; i < iser_conn->qp_max_recv_dtos; i++) {
0325         err = iser_post_recvm(iser_conn, &iser_conn->rx_descs[i]);
0326         if (err)
0327             goto out;
0328     }
0329 out:
0330     return err;
0331 }
0332 
0333 /**
0334  * iser_send_command - send command PDU
0335  * @conn: link to matching iscsi connection
0336  * @task: SCSI command task
0337  */
0338 int iser_send_command(struct iscsi_conn *conn, struct iscsi_task *task)
0339 {
0340     struct iser_conn *iser_conn = conn->dd_data;
0341     struct iscsi_iser_task *iser_task = task->dd_data;
0342     unsigned long edtl;
0343     int err;
0344     struct iser_data_buf *data_buf, *prot_buf;
0345     struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
0346     struct scsi_cmnd *sc  =  task->sc;
0347     struct iser_tx_desc *tx_desc = &iser_task->desc;
0348 
0349     edtl = ntohl(hdr->data_length);
0350 
0351     /* build the tx desc regd header and add it to the tx desc dto */
0352     tx_desc->type = ISCSI_TX_SCSI_COMMAND;
0353     tx_desc->cqe.done = iser_cmd_comp;
0354     iser_create_send_desc(iser_conn, tx_desc);
0355 
0356     if (hdr->flags & ISCSI_FLAG_CMD_READ) {
0357         data_buf = &iser_task->data[ISER_DIR_IN];
0358         prot_buf = &iser_task->prot[ISER_DIR_IN];
0359     } else {
0360         data_buf = &iser_task->data[ISER_DIR_OUT];
0361         prot_buf = &iser_task->prot[ISER_DIR_OUT];
0362     }
0363 
0364     if (scsi_sg_count(sc)) { /* using a scatter list */
0365         data_buf->sg = scsi_sglist(sc);
0366         data_buf->size = scsi_sg_count(sc);
0367     }
0368     data_buf->data_len = scsi_bufflen(sc);
0369 
0370     if (scsi_prot_sg_count(sc)) {
0371         prot_buf->sg  = scsi_prot_sglist(sc);
0372         prot_buf->size = scsi_prot_sg_count(sc);
0373         prot_buf->data_len = (data_buf->data_len >>
0374                      ilog2(sc->device->sector_size)) * 8;
0375     }
0376 
0377     if (hdr->flags & ISCSI_FLAG_CMD_READ) {
0378         err = iser_prepare_read_cmd(task);
0379         if (err)
0380             goto send_command_error;
0381     }
0382     if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
0383         err = iser_prepare_write_cmd(task,
0384                          task->imm_count,
0385                              task->imm_count +
0386                          task->unsol_r2t.data_length,
0387                          edtl);
0388         if (err)
0389             goto send_command_error;
0390     }
0391 
0392     iser_task->status = ISER_TASK_STATUS_STARTED;
0393 
0394     err = iser_post_send(&iser_conn->ib_conn, tx_desc);
0395     if (!err)
0396         return 0;
0397 
0398 send_command_error:
0399     iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
0400     return err;
0401 }
0402 
0403 /**
0404  * iser_send_data_out - send data out PDU
0405  * @conn: link to matching iscsi connection
0406  * @task: SCSI command task
0407  * @hdr: pointer to the LLD's iSCSI message header
0408  */
0409 int iser_send_data_out(struct iscsi_conn *conn, struct iscsi_task *task,
0410                struct iscsi_data *hdr)
0411 {
0412     struct iser_conn *iser_conn = conn->dd_data;
0413     struct iscsi_iser_task *iser_task = task->dd_data;
0414     struct iser_tx_desc *tx_desc;
0415     struct iser_mem_reg *mem_reg;
0416     unsigned long buf_offset;
0417     unsigned long data_seg_len;
0418     uint32_t itt;
0419     int err;
0420     struct ib_sge *tx_dsg;
0421 
0422     itt = (__force uint32_t)hdr->itt;
0423     data_seg_len = ntoh24(hdr->dlength);
0424     buf_offset   = ntohl(hdr->offset);
0425 
0426     iser_dbg("%s itt %d dseg_len %d offset %d\n",
0427          __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
0428 
0429     tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
0430     if (!tx_desc)
0431         return -ENOMEM;
0432 
0433     tx_desc->type = ISCSI_TX_DATAOUT;
0434     tx_desc->cqe.done = iser_dataout_comp;
0435     tx_desc->iser_header.flags = ISER_VER;
0436     memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
0437 
0438     /* build the tx desc */
0439     err = iser_initialize_task_headers(task, tx_desc);
0440     if (err)
0441         goto send_data_out_error;
0442 
0443     mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
0444     tx_dsg = &tx_desc->tx_sg[1];
0445     tx_dsg->addr = mem_reg->sge.addr + buf_offset;
0446     tx_dsg->length = data_seg_len;
0447     tx_dsg->lkey = mem_reg->sge.lkey;
0448     tx_desc->num_sge = 2;
0449 
0450     if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
0451         iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n",
0452              buf_offset, data_seg_len,
0453              iser_task->data[ISER_DIR_OUT].data_len, itt);
0454         err = -EINVAL;
0455         goto send_data_out_error;
0456     }
0457     iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
0458          itt, buf_offset, data_seg_len);
0459 
0460 
0461     err = iser_post_send(&iser_conn->ib_conn, tx_desc);
0462     if (!err)
0463         return 0;
0464 
0465 send_data_out_error:
0466     kmem_cache_free(ig.desc_cache, tx_desc);
0467     iser_err("conn %p failed err %d\n", conn, err);
0468     return err;
0469 }
0470 
0471 int iser_send_control(struct iscsi_conn *conn, struct iscsi_task *task)
0472 {
0473     struct iser_conn *iser_conn = conn->dd_data;
0474     struct iscsi_iser_task *iser_task = task->dd_data;
0475     struct iser_tx_desc *mdesc = &iser_task->desc;
0476     unsigned long data_seg_len;
0477     int err = 0;
0478     struct iser_device *device;
0479 
0480     /* build the tx desc regd header and add it to the tx desc dto */
0481     mdesc->type = ISCSI_TX_CONTROL;
0482     mdesc->cqe.done = iser_ctrl_comp;
0483     iser_create_send_desc(iser_conn, mdesc);
0484 
0485     device = iser_conn->ib_conn.device;
0486 
0487     data_seg_len = ntoh24(task->hdr->dlength);
0488 
0489     if (data_seg_len > 0) {
0490         struct iser_login_desc *desc = &iser_conn->login_desc;
0491         struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
0492 
0493         if (task != conn->login_task) {
0494             iser_err("data present on non login task!!!\n");
0495             goto send_control_error;
0496         }
0497 
0498         ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma,
0499                        task->data_count, DMA_TO_DEVICE);
0500 
0501         memcpy(desc->req, task->data, task->data_count);
0502 
0503         ib_dma_sync_single_for_device(device->ib_device, desc->req_dma,
0504                           task->data_count, DMA_TO_DEVICE);
0505 
0506         tx_dsg->addr = desc->req_dma;
0507         tx_dsg->length = task->data_count;
0508         tx_dsg->lkey = device->pd->local_dma_lkey;
0509         mdesc->num_sge = 2;
0510     }
0511 
0512     if (task == conn->login_task) {
0513         iser_dbg("op %x dsl %lx, posting login rx buffer\n",
0514              task->hdr->opcode, data_seg_len);
0515         err = iser_post_recvl(iser_conn);
0516         if (err)
0517             goto send_control_error;
0518         err = iser_post_rx_bufs(conn, task->hdr);
0519         if (err)
0520             goto send_control_error;
0521     }
0522 
0523     err = iser_post_send(&iser_conn->ib_conn, mdesc);
0524     if (!err)
0525         return 0;
0526 
0527 send_control_error:
0528     iser_err("conn %p failed err %d\n",conn, err);
0529     return err;
0530 }
0531 
0532 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc)
0533 {
0534     struct ib_conn *ib_conn = wc->qp->qp_context;
0535     struct iser_conn *iser_conn = to_iser_conn(ib_conn);
0536     struct iser_login_desc *desc = iser_login(wc->wr_cqe);
0537     struct iscsi_hdr *hdr;
0538     char *data;
0539     int length;
0540     bool full_feature_phase;
0541 
0542     if (unlikely(wc->status != IB_WC_SUCCESS)) {
0543         iser_err_comp(wc, "login_rsp");
0544         return;
0545     }
0546 
0547     ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
0548                    desc->rsp_dma, ISER_RX_LOGIN_SIZE,
0549                    DMA_FROM_DEVICE);
0550 
0551     hdr = desc->rsp + sizeof(struct iser_ctrl);
0552     data = desc->rsp + ISER_HEADERS_LEN;
0553     length = wc->byte_len - ISER_HEADERS_LEN;
0554     full_feature_phase = ((hdr->flags & ISCSI_FULL_FEATURE_PHASE) ==
0555                   ISCSI_FULL_FEATURE_PHASE) &&
0556                  (hdr->flags & ISCSI_FLAG_CMD_FINAL);
0557 
0558     iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
0559          hdr->itt, length);
0560 
0561     iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length);
0562 
0563     ib_dma_sync_single_for_device(ib_conn->device->ib_device,
0564                       desc->rsp_dma, ISER_RX_LOGIN_SIZE,
0565                       DMA_FROM_DEVICE);
0566 
0567     if (!full_feature_phase ||
0568         iser_conn->iscsi_conn->session->discovery_sess)
0569         return;
0570 
0571     /* Post the first RX buffer that is skipped in iser_post_rx_bufs() */
0572     iser_post_recvm(iser_conn, iser_conn->rx_descs);
0573 }
0574 
0575 static inline int iser_inv_desc(struct iser_fr_desc *desc, u32 rkey)
0576 {
0577     if (unlikely((!desc->sig_protected && rkey != desc->rsc.mr->rkey) ||
0578              (desc->sig_protected && rkey != desc->rsc.sig_mr->rkey))) {
0579         iser_err("Bogus remote invalidation for rkey %#x\n", rkey);
0580         return -EINVAL;
0581     }
0582 
0583     desc->rsc.mr_valid = 0;
0584 
0585     return 0;
0586 }
0587 
0588 static int iser_check_remote_inv(struct iser_conn *iser_conn, struct ib_wc *wc,
0589                  struct iscsi_hdr *hdr)
0590 {
0591     if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
0592         struct iscsi_task *task;
0593         u32 rkey = wc->ex.invalidate_rkey;
0594 
0595         iser_dbg("conn %p: remote invalidation for rkey %#x\n",
0596              iser_conn, rkey);
0597 
0598         if (unlikely(!iser_conn->snd_w_inv)) {
0599             iser_err("conn %p: unexpected remote invalidation, terminating connection\n",
0600                  iser_conn);
0601             return -EPROTO;
0602         }
0603 
0604         task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt);
0605         if (likely(task)) {
0606             struct iscsi_iser_task *iser_task = task->dd_data;
0607             struct iser_fr_desc *desc;
0608 
0609             if (iser_task->dir[ISER_DIR_IN]) {
0610                 desc = iser_task->rdma_reg[ISER_DIR_IN].desc;
0611                 if (unlikely(iser_inv_desc(desc, rkey)))
0612                     return -EINVAL;
0613             }
0614 
0615             if (iser_task->dir[ISER_DIR_OUT]) {
0616                 desc = iser_task->rdma_reg[ISER_DIR_OUT].desc;
0617                 if (unlikely(iser_inv_desc(desc, rkey)))
0618                     return -EINVAL;
0619             }
0620         } else {
0621             iser_err("failed to get task for itt=%d\n", hdr->itt);
0622             return -EINVAL;
0623         }
0624     }
0625 
0626     return 0;
0627 }
0628 
0629 
0630 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc)
0631 {
0632     struct ib_conn *ib_conn = wc->qp->qp_context;
0633     struct iser_conn *iser_conn = to_iser_conn(ib_conn);
0634     struct iser_rx_desc *desc = iser_rx(wc->wr_cqe);
0635     struct iscsi_hdr *hdr;
0636     int length, err;
0637 
0638     if (unlikely(wc->status != IB_WC_SUCCESS)) {
0639         iser_err_comp(wc, "task_rsp");
0640         return;
0641     }
0642 
0643     ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
0644                    desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
0645                    DMA_FROM_DEVICE);
0646 
0647     hdr = &desc->iscsi_header;
0648     length = wc->byte_len - ISER_HEADERS_LEN;
0649 
0650     iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
0651          hdr->itt, length);
0652 
0653     if (iser_check_remote_inv(iser_conn, wc, hdr)) {
0654         iscsi_conn_failure(iser_conn->iscsi_conn,
0655                    ISCSI_ERR_CONN_FAILED);
0656         return;
0657     }
0658 
0659     iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length);
0660 
0661     ib_dma_sync_single_for_device(ib_conn->device->ib_device,
0662                       desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
0663                       DMA_FROM_DEVICE);
0664 
0665     err = iser_post_recvm(iser_conn, desc);
0666     if (err)
0667         iser_err("posting rx buffer err %d\n", err);
0668 }
0669 
0670 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc)
0671 {
0672     if (unlikely(wc->status != IB_WC_SUCCESS))
0673         iser_err_comp(wc, "command");
0674 }
0675 
0676 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc)
0677 {
0678     struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
0679     struct iscsi_task *task;
0680 
0681     if (unlikely(wc->status != IB_WC_SUCCESS)) {
0682         iser_err_comp(wc, "control");
0683         return;
0684     }
0685 
0686     /* this arithmetic is legal by libiscsi dd_data allocation */
0687     task = (void *)desc - sizeof(struct iscsi_task);
0688     if (task->hdr->itt == RESERVED_ITT)
0689         iscsi_put_task(task);
0690 }
0691 
0692 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc)
0693 {
0694     struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
0695     struct ib_conn *ib_conn = wc->qp->qp_context;
0696     struct iser_device *device = ib_conn->device;
0697 
0698     if (unlikely(wc->status != IB_WC_SUCCESS))
0699         iser_err_comp(wc, "dataout");
0700 
0701     ib_dma_unmap_single(device->ib_device, desc->dma_addr,
0702                 ISER_HEADERS_LEN, DMA_TO_DEVICE);
0703     kmem_cache_free(ig.desc_cache, desc);
0704 }
0705 
0706 void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
0707 
0708 {
0709     iser_task->status = ISER_TASK_STATUS_INIT;
0710 
0711     iser_task->dir[ISER_DIR_IN] = 0;
0712     iser_task->dir[ISER_DIR_OUT] = 0;
0713 
0714     iser_task->data[ISER_DIR_IN].data_len  = 0;
0715     iser_task->data[ISER_DIR_OUT].data_len = 0;
0716 
0717     iser_task->prot[ISER_DIR_IN].data_len  = 0;
0718     iser_task->prot[ISER_DIR_OUT].data_len = 0;
0719 
0720     iser_task->prot[ISER_DIR_IN].dma_nents = 0;
0721     iser_task->prot[ISER_DIR_OUT].dma_nents = 0;
0722 
0723     memset(&iser_task->rdma_reg[ISER_DIR_IN], 0,
0724            sizeof(struct iser_mem_reg));
0725     memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,
0726            sizeof(struct iser_mem_reg));
0727 }
0728 
0729 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
0730 {
0731 
0732     if (iser_task->dir[ISER_DIR_IN]) {
0733         iser_unreg_mem_fastreg(iser_task, ISER_DIR_IN);
0734         iser_dma_unmap_task_data(iser_task, ISER_DIR_IN,
0735                      DMA_FROM_DEVICE);
0736     }
0737 
0738     if (iser_task->dir[ISER_DIR_OUT]) {
0739         iser_unreg_mem_fastreg(iser_task, ISER_DIR_OUT);
0740         iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT,
0741                      DMA_TO_DEVICE);
0742     }
0743 }
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