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a4ee3539f6
Structure that describes the RDMA relates connection objects. Static member of iser_conn. This patch does not change any functionality Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
729 lines
21 KiB
C
729 lines
21 KiB
C
/*
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* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
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* Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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#include <linux/kfifo.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
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#include "iscsi_iser.h"
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/* Register user buffer memory and initialize passive rdma
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* dto descriptor. Data size is stored in
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* task->data[ISER_DIR_IN].data_len, Protection size
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* os stored in task->prot[ISER_DIR_IN].data_len
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*/
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static int iser_prepare_read_cmd(struct iscsi_task *task)
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{
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struct iscsi_iser_task *iser_task = task->dd_data;
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struct iser_device *device = iser_task->iser_conn->ib_conn.device;
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struct iser_regd_buf *regd_buf;
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int err;
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struct iser_hdr *hdr = &iser_task->desc.iser_header;
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struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN];
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err = iser_dma_map_task_data(iser_task,
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buf_in,
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ISER_DIR_IN,
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DMA_FROM_DEVICE);
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if (err)
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return err;
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if (scsi_prot_sg_count(iser_task->sc)) {
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struct iser_data_buf *pbuf_in = &iser_task->prot[ISER_DIR_IN];
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err = iser_dma_map_task_data(iser_task,
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pbuf_in,
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ISER_DIR_IN,
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DMA_FROM_DEVICE);
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if (err)
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return err;
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}
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err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_IN);
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if (err) {
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iser_err("Failed to set up Data-IN RDMA\n");
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return err;
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}
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regd_buf = &iser_task->rdma_regd[ISER_DIR_IN];
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hdr->flags |= ISER_RSV;
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hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey);
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hdr->read_va = cpu_to_be64(regd_buf->reg.va);
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iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
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task->itt, regd_buf->reg.rkey,
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(unsigned long long)regd_buf->reg.va);
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return 0;
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}
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/* Register user buffer memory and initialize passive rdma
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* dto descriptor. Data size is stored in
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* task->data[ISER_DIR_OUT].data_len, Protection size
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* is stored at task->prot[ISER_DIR_OUT].data_len
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*/
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static int
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iser_prepare_write_cmd(struct iscsi_task *task,
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unsigned int imm_sz,
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unsigned int unsol_sz,
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unsigned int edtl)
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{
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struct iscsi_iser_task *iser_task = task->dd_data;
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struct iser_device *device = iser_task->iser_conn->ib_conn.device;
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struct iser_regd_buf *regd_buf;
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int err;
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struct iser_hdr *hdr = &iser_task->desc.iser_header;
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struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
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struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
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err = iser_dma_map_task_data(iser_task,
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buf_out,
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ISER_DIR_OUT,
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DMA_TO_DEVICE);
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if (err)
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return err;
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if (scsi_prot_sg_count(iser_task->sc)) {
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struct iser_data_buf *pbuf_out = &iser_task->prot[ISER_DIR_OUT];
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err = iser_dma_map_task_data(iser_task,
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pbuf_out,
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ISER_DIR_OUT,
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DMA_TO_DEVICE);
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if (err)
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return err;
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}
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err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_OUT);
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if (err != 0) {
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iser_err("Failed to register write cmd RDMA mem\n");
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return err;
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}
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regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
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if (unsol_sz < edtl) {
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hdr->flags |= ISER_WSV;
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hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey);
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hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz);
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iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X "
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"VA:%#llX + unsol:%d\n",
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task->itt, regd_buf->reg.rkey,
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(unsigned long long)regd_buf->reg.va, unsol_sz);
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}
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if (imm_sz > 0) {
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iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
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task->itt, imm_sz);
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tx_dsg->addr = regd_buf->reg.va;
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tx_dsg->length = imm_sz;
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tx_dsg->lkey = regd_buf->reg.lkey;
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iser_task->desc.num_sge = 2;
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}
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return 0;
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}
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/* creates a new tx descriptor and adds header regd buffer */
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static void iser_create_send_desc(struct iser_conn *iser_conn,
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struct iser_tx_desc *tx_desc)
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{
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struct iser_device *device = iser_conn->ib_conn.device;
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ib_dma_sync_single_for_cpu(device->ib_device,
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tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
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memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
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tx_desc->iser_header.flags = ISER_VER;
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tx_desc->num_sge = 1;
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if (tx_desc->tx_sg[0].lkey != device->mr->lkey) {
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tx_desc->tx_sg[0].lkey = device->mr->lkey;
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iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc);
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}
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}
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static void iser_free_login_buf(struct iser_conn *iser_conn)
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{
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struct iser_device *device = iser_conn->ib_conn.device;
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if (!iser_conn->login_buf)
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return;
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if (iser_conn->login_req_dma)
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ib_dma_unmap_single(device->ib_device,
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iser_conn->login_req_dma,
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ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
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if (iser_conn->login_resp_dma)
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ib_dma_unmap_single(device->ib_device,
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iser_conn->login_resp_dma,
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ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
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kfree(iser_conn->login_buf);
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/* make sure we never redo any unmapping */
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iser_conn->login_req_dma = 0;
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iser_conn->login_resp_dma = 0;
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iser_conn->login_buf = NULL;
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}
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static int iser_alloc_login_buf(struct iser_conn *iser_conn)
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{
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struct iser_device *device = iser_conn->ib_conn.device;
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int req_err, resp_err;
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BUG_ON(device == NULL);
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iser_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
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ISER_RX_LOGIN_SIZE, GFP_KERNEL);
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if (!iser_conn->login_buf)
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goto out_err;
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iser_conn->login_req_buf = iser_conn->login_buf;
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iser_conn->login_resp_buf = iser_conn->login_buf +
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ISCSI_DEF_MAX_RECV_SEG_LEN;
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iser_conn->login_req_dma = ib_dma_map_single(device->ib_device,
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iser_conn->login_req_buf,
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ISCSI_DEF_MAX_RECV_SEG_LEN,
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DMA_TO_DEVICE);
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iser_conn->login_resp_dma = ib_dma_map_single(device->ib_device,
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iser_conn->login_resp_buf,
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ISER_RX_LOGIN_SIZE,
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DMA_FROM_DEVICE);
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req_err = ib_dma_mapping_error(device->ib_device,
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iser_conn->login_req_dma);
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resp_err = ib_dma_mapping_error(device->ib_device,
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iser_conn->login_resp_dma);
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if (req_err || resp_err) {
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if (req_err)
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iser_conn->login_req_dma = 0;
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if (resp_err)
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iser_conn->login_resp_dma = 0;
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goto free_login_buf;
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}
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return 0;
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free_login_buf:
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iser_free_login_buf(iser_conn);
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out_err:
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iser_err("unable to alloc or map login buf\n");
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return -ENOMEM;
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}
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int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
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struct iscsi_session *session)
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{
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int i, j;
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u64 dma_addr;
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struct iser_rx_desc *rx_desc;
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struct ib_sge *rx_sg;
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struct ib_conn *ib_conn = &iser_conn->ib_conn;
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struct iser_device *device = ib_conn->device;
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iser_conn->qp_max_recv_dtos = session->cmds_max;
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iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */
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iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2;
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if (device->iser_alloc_rdma_reg_res(ib_conn, session->scsi_cmds_max))
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goto create_rdma_reg_res_failed;
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if (iser_alloc_login_buf(iser_conn))
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goto alloc_login_buf_fail;
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iser_conn->rx_descs = kmalloc(session->cmds_max *
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sizeof(struct iser_rx_desc), GFP_KERNEL);
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if (!iser_conn->rx_descs)
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goto rx_desc_alloc_fail;
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rx_desc = iser_conn->rx_descs;
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for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) {
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dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
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ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
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if (ib_dma_mapping_error(device->ib_device, dma_addr))
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goto rx_desc_dma_map_failed;
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rx_desc->dma_addr = dma_addr;
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rx_sg = &rx_desc->rx_sg;
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rx_sg->addr = rx_desc->dma_addr;
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rx_sg->length = ISER_RX_PAYLOAD_SIZE;
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rx_sg->lkey = device->mr->lkey;
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}
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iser_conn->rx_desc_head = 0;
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return 0;
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rx_desc_dma_map_failed:
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rx_desc = iser_conn->rx_descs;
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for (j = 0; j < i; j++, rx_desc++)
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ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
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ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
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kfree(iser_conn->rx_descs);
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iser_conn->rx_descs = NULL;
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rx_desc_alloc_fail:
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iser_free_login_buf(iser_conn);
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alloc_login_buf_fail:
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device->iser_free_rdma_reg_res(ib_conn);
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create_rdma_reg_res_failed:
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iser_err("failed allocating rx descriptors / data buffers\n");
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return -ENOMEM;
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}
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void iser_free_rx_descriptors(struct iser_conn *iser_conn)
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{
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int i;
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struct iser_rx_desc *rx_desc;
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struct ib_conn *ib_conn = &iser_conn->ib_conn;
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struct iser_device *device = ib_conn->device;
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if (!iser_conn->rx_descs)
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goto free_login_buf;
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if (device->iser_free_rdma_reg_res)
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device->iser_free_rdma_reg_res(ib_conn);
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rx_desc = iser_conn->rx_descs;
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for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)
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ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
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ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
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kfree(iser_conn->rx_descs);
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/* make sure we never redo any unmapping */
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iser_conn->rx_descs = NULL;
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free_login_buf:
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iser_free_login_buf(iser_conn);
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}
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static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
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{
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struct iser_conn *iser_conn = conn->dd_data;
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struct ib_conn *ib_conn = &iser_conn->ib_conn;
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struct iscsi_session *session = conn->session;
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iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
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/* check if this is the last login - going to full feature phase */
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if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
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return 0;
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/*
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* Check that there is one posted recv buffer (for the last login
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* response) and no posted send buffers left - they must have been
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* consumed during previous login phases.
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*/
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WARN_ON(ib_conn->post_recv_buf_count != 1);
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WARN_ON(atomic_read(&ib_conn->post_send_buf_count) != 0);
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if (session->discovery_sess) {
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iser_info("Discovery session, re-using login RX buffer\n");
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return 0;
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} else
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iser_info("Normal session, posting batch of RX %d buffers\n",
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iser_conn->min_posted_rx);
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/* Initial post receive buffers */
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if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx))
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return -ENOMEM;
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return 0;
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}
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/**
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* iser_send_command - send command PDU
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*/
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int iser_send_command(struct iscsi_conn *conn,
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struct iscsi_task *task)
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{
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struct iser_conn *iser_conn = conn->dd_data;
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struct iscsi_iser_task *iser_task = task->dd_data;
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unsigned long edtl;
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int err;
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struct iser_data_buf *data_buf, *prot_buf;
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struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
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struct scsi_cmnd *sc = task->sc;
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struct iser_tx_desc *tx_desc = &iser_task->desc;
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edtl = ntohl(hdr->data_length);
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/* build the tx desc regd header and add it to the tx desc dto */
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tx_desc->type = ISCSI_TX_SCSI_COMMAND;
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iser_create_send_desc(iser_conn, tx_desc);
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if (hdr->flags & ISCSI_FLAG_CMD_READ) {
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data_buf = &iser_task->data[ISER_DIR_IN];
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prot_buf = &iser_task->prot[ISER_DIR_IN];
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} else {
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data_buf = &iser_task->data[ISER_DIR_OUT];
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prot_buf = &iser_task->prot[ISER_DIR_OUT];
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}
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if (scsi_sg_count(sc)) { /* using a scatter list */
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data_buf->buf = scsi_sglist(sc);
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data_buf->size = scsi_sg_count(sc);
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}
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data_buf->data_len = scsi_bufflen(sc);
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if (scsi_prot_sg_count(sc)) {
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prot_buf->buf = scsi_prot_sglist(sc);
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prot_buf->size = scsi_prot_sg_count(sc);
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prot_buf->data_len = data_buf->data_len >>
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ilog2(sc->device->sector_size) * 8;
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}
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if (hdr->flags & ISCSI_FLAG_CMD_READ) {
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err = iser_prepare_read_cmd(task);
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if (err)
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goto send_command_error;
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}
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if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
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err = iser_prepare_write_cmd(task,
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task->imm_count,
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task->imm_count +
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task->unsol_r2t.data_length,
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edtl);
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if (err)
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goto send_command_error;
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}
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iser_task->status = ISER_TASK_STATUS_STARTED;
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err = iser_post_send(&iser_conn->ib_conn, tx_desc);
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if (!err)
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return 0;
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send_command_error:
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iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
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return err;
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}
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/**
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* iser_send_data_out - send data out PDU
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*/
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int iser_send_data_out(struct iscsi_conn *conn,
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struct iscsi_task *task,
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struct iscsi_data *hdr)
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{
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struct iser_conn *iser_conn = conn->dd_data;
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struct iscsi_iser_task *iser_task = task->dd_data;
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struct iser_tx_desc *tx_desc = NULL;
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struct iser_regd_buf *regd_buf;
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unsigned long buf_offset;
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unsigned long data_seg_len;
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uint32_t itt;
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int err = 0;
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struct ib_sge *tx_dsg;
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itt = (__force uint32_t)hdr->itt;
|
|
data_seg_len = ntoh24(hdr->dlength);
|
|
buf_offset = ntohl(hdr->offset);
|
|
|
|
iser_dbg("%s itt %d dseg_len %d offset %d\n",
|
|
__func__,(int)itt,(int)data_seg_len,(int)buf_offset);
|
|
|
|
tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
|
|
if (tx_desc == NULL) {
|
|
iser_err("Failed to alloc desc for post dataout\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
tx_desc->type = ISCSI_TX_DATAOUT;
|
|
tx_desc->iser_header.flags = ISER_VER;
|
|
memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
|
|
|
|
/* build the tx desc */
|
|
iser_initialize_task_headers(task, tx_desc);
|
|
|
|
regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
|
|
tx_dsg = &tx_desc->tx_sg[1];
|
|
tx_dsg->addr = regd_buf->reg.va + buf_offset;
|
|
tx_dsg->length = data_seg_len;
|
|
tx_dsg->lkey = regd_buf->reg.lkey;
|
|
tx_desc->num_sge = 2;
|
|
|
|
if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
|
|
iser_err("Offset:%ld & DSL:%ld in Data-Out "
|
|
"inconsistent with total len:%ld, itt:%d\n",
|
|
buf_offset, data_seg_len,
|
|
iser_task->data[ISER_DIR_OUT].data_len, itt);
|
|
err = -EINVAL;
|
|
goto send_data_out_error;
|
|
}
|
|
iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
|
|
itt, buf_offset, data_seg_len);
|
|
|
|
|
|
err = iser_post_send(&iser_conn->ib_conn, tx_desc);
|
|
if (!err)
|
|
return 0;
|
|
|
|
send_data_out_error:
|
|
kmem_cache_free(ig.desc_cache, tx_desc);
|
|
iser_err("conn %p failed err %d\n",conn, err);
|
|
return err;
|
|
}
|
|
|
|
int iser_send_control(struct iscsi_conn *conn,
|
|
struct iscsi_task *task)
|
|
{
|
|
struct iser_conn *iser_conn = conn->dd_data;
|
|
struct iscsi_iser_task *iser_task = task->dd_data;
|
|
struct iser_tx_desc *mdesc = &iser_task->desc;
|
|
unsigned long data_seg_len;
|
|
int err = 0;
|
|
struct iser_device *device;
|
|
|
|
/* build the tx desc regd header and add it to the tx desc dto */
|
|
mdesc->type = ISCSI_TX_CONTROL;
|
|
iser_create_send_desc(iser_conn, mdesc);
|
|
|
|
device = iser_conn->ib_conn.device;
|
|
|
|
data_seg_len = ntoh24(task->hdr->dlength);
|
|
|
|
if (data_seg_len > 0) {
|
|
struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
|
|
if (task != conn->login_task) {
|
|
iser_err("data present on non login task!!!\n");
|
|
goto send_control_error;
|
|
}
|
|
|
|
ib_dma_sync_single_for_cpu(device->ib_device,
|
|
iser_conn->login_req_dma, task->data_count,
|
|
DMA_TO_DEVICE);
|
|
|
|
memcpy(iser_conn->login_req_buf, task->data, task->data_count);
|
|
|
|
ib_dma_sync_single_for_device(device->ib_device,
|
|
iser_conn->login_req_dma, task->data_count,
|
|
DMA_TO_DEVICE);
|
|
|
|
tx_dsg->addr = iser_conn->login_req_dma;
|
|
tx_dsg->length = task->data_count;
|
|
tx_dsg->lkey = device->mr->lkey;
|
|
mdesc->num_sge = 2;
|
|
}
|
|
|
|
if (task == conn->login_task) {
|
|
iser_dbg("op %x dsl %lx, posting login rx buffer\n",
|
|
task->hdr->opcode, data_seg_len);
|
|
err = iser_post_recvl(iser_conn);
|
|
if (err)
|
|
goto send_control_error;
|
|
err = iser_post_rx_bufs(conn, task->hdr);
|
|
if (err)
|
|
goto send_control_error;
|
|
}
|
|
|
|
err = iser_post_send(&iser_conn->ib_conn, mdesc);
|
|
if (!err)
|
|
return 0;
|
|
|
|
send_control_error:
|
|
iser_err("conn %p failed err %d\n",conn, err);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* iser_rcv_dto_completion - recv DTO completion
|
|
*/
|
|
void iser_rcv_completion(struct iser_rx_desc *rx_desc,
|
|
unsigned long rx_xfer_len,
|
|
struct ib_conn *ib_conn)
|
|
{
|
|
struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn,
|
|
ib_conn);
|
|
struct iscsi_hdr *hdr;
|
|
u64 rx_dma;
|
|
int rx_buflen, outstanding, count, err;
|
|
|
|
/* differentiate between login to all other PDUs */
|
|
if ((char *)rx_desc == iser_conn->login_resp_buf) {
|
|
rx_dma = iser_conn->login_resp_dma;
|
|
rx_buflen = ISER_RX_LOGIN_SIZE;
|
|
} else {
|
|
rx_dma = rx_desc->dma_addr;
|
|
rx_buflen = ISER_RX_PAYLOAD_SIZE;
|
|
}
|
|
|
|
ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma,
|
|
rx_buflen, DMA_FROM_DEVICE);
|
|
|
|
hdr = &rx_desc->iscsi_header;
|
|
|
|
iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
|
|
hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN));
|
|
|
|
iscsi_iser_recv(iser_conn->iscsi_conn, hdr, rx_desc->data,
|
|
rx_xfer_len - ISER_HEADERS_LEN);
|
|
|
|
ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma,
|
|
rx_buflen, DMA_FROM_DEVICE);
|
|
|
|
/* decrementing conn->post_recv_buf_count only --after-- freeing the *
|
|
* task eliminates the need to worry on tasks which are completed in *
|
|
* parallel to the execution of iser_conn_term. So the code that waits *
|
|
* for the posted rx bufs refcount to become zero handles everything */
|
|
ib_conn->post_recv_buf_count--;
|
|
|
|
if (rx_dma == iser_conn->login_resp_dma)
|
|
return;
|
|
|
|
outstanding = ib_conn->post_recv_buf_count;
|
|
if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) {
|
|
count = min(iser_conn->qp_max_recv_dtos - outstanding,
|
|
iser_conn->min_posted_rx);
|
|
err = iser_post_recvm(iser_conn, count);
|
|
if (err)
|
|
iser_err("posting %d rx bufs err %d\n", count, err);
|
|
}
|
|
}
|
|
|
|
void iser_snd_completion(struct iser_tx_desc *tx_desc,
|
|
struct ib_conn *ib_conn)
|
|
{
|
|
struct iscsi_task *task;
|
|
struct iser_device *device = ib_conn->device;
|
|
|
|
if (tx_desc->type == ISCSI_TX_DATAOUT) {
|
|
ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
|
|
ISER_HEADERS_LEN, DMA_TO_DEVICE);
|
|
kmem_cache_free(ig.desc_cache, tx_desc);
|
|
tx_desc = NULL;
|
|
}
|
|
|
|
atomic_dec(&ib_conn->post_send_buf_count);
|
|
|
|
if (tx_desc && tx_desc->type == ISCSI_TX_CONTROL) {
|
|
/* this arithmetic is legal by libiscsi dd_data allocation */
|
|
task = (void *) ((long)(void *)tx_desc -
|
|
sizeof(struct iscsi_task));
|
|
if (task->hdr->itt == RESERVED_ITT)
|
|
iscsi_put_task(task);
|
|
}
|
|
}
|
|
|
|
void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
|
|
|
|
{
|
|
iser_task->status = ISER_TASK_STATUS_INIT;
|
|
|
|
iser_task->dir[ISER_DIR_IN] = 0;
|
|
iser_task->dir[ISER_DIR_OUT] = 0;
|
|
|
|
iser_task->data[ISER_DIR_IN].data_len = 0;
|
|
iser_task->data[ISER_DIR_OUT].data_len = 0;
|
|
|
|
iser_task->prot[ISER_DIR_IN].data_len = 0;
|
|
iser_task->prot[ISER_DIR_OUT].data_len = 0;
|
|
|
|
memset(&iser_task->rdma_regd[ISER_DIR_IN], 0,
|
|
sizeof(struct iser_regd_buf));
|
|
memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0,
|
|
sizeof(struct iser_regd_buf));
|
|
}
|
|
|
|
void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
|
|
{
|
|
struct iser_device *device = iser_task->iser_conn->ib_conn.device;
|
|
int is_rdma_data_aligned = 1;
|
|
int is_rdma_prot_aligned = 1;
|
|
int prot_count = scsi_prot_sg_count(iser_task->sc);
|
|
|
|
/* if we were reading, copy back to unaligned sglist,
|
|
* anyway dma_unmap and free the copy
|
|
*/
|
|
if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) {
|
|
is_rdma_data_aligned = 0;
|
|
iser_finalize_rdma_unaligned_sg(iser_task,
|
|
&iser_task->data[ISER_DIR_IN],
|
|
&iser_task->data_copy[ISER_DIR_IN],
|
|
ISER_DIR_IN);
|
|
}
|
|
|
|
if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) {
|
|
is_rdma_data_aligned = 0;
|
|
iser_finalize_rdma_unaligned_sg(iser_task,
|
|
&iser_task->data[ISER_DIR_OUT],
|
|
&iser_task->data_copy[ISER_DIR_OUT],
|
|
ISER_DIR_OUT);
|
|
}
|
|
|
|
if (iser_task->prot_copy[ISER_DIR_IN].copy_buf != NULL) {
|
|
is_rdma_prot_aligned = 0;
|
|
iser_finalize_rdma_unaligned_sg(iser_task,
|
|
&iser_task->prot[ISER_DIR_IN],
|
|
&iser_task->prot_copy[ISER_DIR_IN],
|
|
ISER_DIR_IN);
|
|
}
|
|
|
|
if (iser_task->prot_copy[ISER_DIR_OUT].copy_buf != NULL) {
|
|
is_rdma_prot_aligned = 0;
|
|
iser_finalize_rdma_unaligned_sg(iser_task,
|
|
&iser_task->prot[ISER_DIR_OUT],
|
|
&iser_task->prot_copy[ISER_DIR_OUT],
|
|
ISER_DIR_OUT);
|
|
}
|
|
|
|
if (iser_task->dir[ISER_DIR_IN]) {
|
|
device->iser_unreg_rdma_mem(iser_task, ISER_DIR_IN);
|
|
if (is_rdma_data_aligned)
|
|
iser_dma_unmap_task_data(iser_task,
|
|
&iser_task->data[ISER_DIR_IN]);
|
|
if (prot_count && is_rdma_prot_aligned)
|
|
iser_dma_unmap_task_data(iser_task,
|
|
&iser_task->prot[ISER_DIR_IN]);
|
|
}
|
|
|
|
if (iser_task->dir[ISER_DIR_OUT]) {
|
|
device->iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT);
|
|
if (is_rdma_data_aligned)
|
|
iser_dma_unmap_task_data(iser_task,
|
|
&iser_task->data[ISER_DIR_OUT]);
|
|
if (prot_count && is_rdma_prot_aligned)
|
|
iser_dma_unmap_task_data(iser_task,
|
|
&iser_task->prot[ISER_DIR_OUT]);
|
|
}
|
|
}
|