IB/iser: iSER initiator iSCSI PDU and TX/RX
This file contains the iSER initiator processing of iSCSI PDUs - controls, commands and data-outs along with processing of TX and RX completions. It interacts with the lower level iser code doing the memory registration and and the cma and verbs calls. Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Or Gerlitz
Roland Dreier
Родитель
65e7ae7bfc
Коммит
e85b24b5e7
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@ -0,0 +1,738 @@
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/*
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* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. 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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* $Id: iser_initiator.c 6964 2006-05-07 11:11:43Z ogerlitz $
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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 <asm/io.h>
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#include <asm/scatterlist.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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/* Constant PDU lengths calculations */
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#define ISER_TOTAL_HEADERS_LEN (sizeof (struct iser_hdr) + \
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sizeof (struct iscsi_hdr))
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/* iser_dto_add_regd_buff - increments the reference count for *
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* the registered buffer & adds it to the DTO object */
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static void iser_dto_add_regd_buff(struct iser_dto *dto,
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struct iser_regd_buf *regd_buf,
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unsigned long use_offset,
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unsigned long use_size)
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{
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int add_idx;
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atomic_inc(®d_buf->ref_count);
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add_idx = dto->regd_vector_len;
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dto->regd[add_idx] = regd_buf;
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dto->used_sz[add_idx] = use_size;
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dto->offset[add_idx] = use_offset;
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dto->regd_vector_len++;
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}
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static int iser_dma_map_task_data(struct iscsi_iser_cmd_task *iser_ctask,
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struct iser_data_buf *data,
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enum iser_data_dir iser_dir,
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enum dma_data_direction dma_dir)
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{
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struct device *dma_device;
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iser_ctask->dir[iser_dir] = 1;
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dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device;
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data->dma_nents = dma_map_sg(dma_device, data->buf, data->size, dma_dir);
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if (data->dma_nents == 0) {
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iser_err("dma_map_sg failed!!!\n");
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return -EINVAL;
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}
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return 0;
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}
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static void iser_dma_unmap_task_data(struct iscsi_iser_cmd_task *iser_ctask)
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{
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struct device *dma_device;
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struct iser_data_buf *data;
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dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device;
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if (iser_ctask->dir[ISER_DIR_IN]) {
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data = &iser_ctask->data[ISER_DIR_IN];
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dma_unmap_sg(dma_device, data->buf, data->size, DMA_FROM_DEVICE);
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}
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if (iser_ctask->dir[ISER_DIR_OUT]) {
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data = &iser_ctask->data[ISER_DIR_OUT];
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dma_unmap_sg(dma_device, data->buf, data->size, DMA_TO_DEVICE);
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}
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}
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/* Register user buffer memory and initialize passive rdma
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* dto descriptor. Total data size is stored in
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* iser_ctask->data[ISER_DIR_IN].data_len
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*/
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static int iser_prepare_read_cmd(struct iscsi_cmd_task *ctask,
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unsigned int edtl)
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{
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struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
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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_ctask->desc.iser_header;
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struct iser_data_buf *buf_in = &iser_ctask->data[ISER_DIR_IN];
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err = iser_dma_map_task_data(iser_ctask,
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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 (edtl > iser_ctask->data[ISER_DIR_IN].data_len) {
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iser_err("Total data length: %ld, less than EDTL: "
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"%d, in READ cmd BHS itt: %d, conn: 0x%p\n",
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iser_ctask->data[ISER_DIR_IN].data_len, edtl,
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ctask->itt, iser_ctask->iser_conn);
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return -EINVAL;
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}
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err = iser_reg_rdma_mem(iser_ctask,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_ctask->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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ctask->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. Total data size is stored in
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* ctask->data[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_cmd_task *ctask,
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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_cmd_task *iser_ctask = ctask->dd_data;
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struct iser_regd_buf *regd_buf;
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int err;
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struct iser_dto *send_dto = &iser_ctask->desc.dto;
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struct iser_hdr *hdr = &iser_ctask->desc.iser_header;
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struct iser_data_buf *buf_out = &iser_ctask->data[ISER_DIR_OUT];
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err = iser_dma_map_task_data(iser_ctask,
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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 (edtl > iser_ctask->data[ISER_DIR_OUT].data_len) {
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iser_err("Total data length: %ld, less than EDTL: %d, "
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"in WRITE cmd BHS itt: %d, conn: 0x%p\n",
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iser_ctask->data[ISER_DIR_OUT].data_len,
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edtl, ctask->itt, ctask->conn);
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return -EINVAL;
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}
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err = iser_reg_rdma_mem(iser_ctask,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_ctask->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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ctask->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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ctask->itt, imm_sz);
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iser_dto_add_regd_buff(send_dto,
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regd_buf,
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0,
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imm_sz);
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}
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return 0;
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}
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/**
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* iser_post_receive_control - allocates, initializes and posts receive DTO.
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*/
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static int iser_post_receive_control(struct iscsi_conn *conn)
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{
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struct iscsi_iser_conn *iser_conn = conn->dd_data;
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struct iser_desc *rx_desc;
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struct iser_regd_buf *regd_hdr;
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struct iser_regd_buf *regd_data;
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struct iser_dto *recv_dto = NULL;
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struct iser_device *device = iser_conn->ib_conn->device;
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int rx_data_size, err = 0;
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rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
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if (rx_desc == NULL) {
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iser_err("Failed to alloc desc for post recv\n");
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return -ENOMEM;
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}
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rx_desc->type = ISCSI_RX;
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/* for the login sequence we must support rx of upto 8K; login is done
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* after conn create/bind (connect) and conn stop/bind (reconnect),
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* what's common for both schemes is that the connection is not started
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*/
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if (conn->c_stage != ISCSI_CONN_STARTED)
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rx_data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
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else /* FIXME till user space sets conn->max_recv_dlength correctly */
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rx_data_size = 128;
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rx_desc->data = kmalloc(rx_data_size, GFP_NOIO);
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if (rx_desc->data == NULL) {
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iser_err("Failed to alloc data buf for post recv\n");
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err = -ENOMEM;
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goto post_rx_kmalloc_failure;
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}
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recv_dto = &rx_desc->dto;
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recv_dto->conn = iser_conn;
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recv_dto->regd_vector_len = 0;
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regd_hdr = &rx_desc->hdr_regd_buf;
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memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
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regd_hdr->device = device;
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regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */
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regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
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iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE);
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iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0);
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regd_data = &rx_desc->data_regd_buf;
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memset(regd_data, 0, sizeof(struct iser_regd_buf));
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regd_data->device = device;
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regd_data->virt_addr = rx_desc->data;
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regd_data->data_size = rx_data_size;
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iser_reg_single(device, regd_data, DMA_FROM_DEVICE);
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iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0);
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err = iser_post_recv(rx_desc);
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if (!err)
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return 0;
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/* iser_post_recv failed */
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iser_dto_buffs_release(recv_dto);
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kfree(rx_desc->data);
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post_rx_kmalloc_failure:
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kmem_cache_free(ig.desc_cache, rx_desc);
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return err;
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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 iscsi_iser_conn *iser_conn,
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struct iser_desc *tx_desc)
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{
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struct iser_regd_buf *regd_hdr = &tx_desc->hdr_regd_buf;
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struct iser_dto *send_dto = &tx_desc->dto;
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memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
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regd_hdr->device = iser_conn->ib_conn->device;
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regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */
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regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
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send_dto->conn = iser_conn;
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send_dto->notify_enable = 1;
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send_dto->regd_vector_len = 0;
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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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iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0);
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}
|
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|
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/**
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* iser_conn_set_full_featured_mode - (iSER API)
|
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*/
|
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int iser_conn_set_full_featured_mode(struct iscsi_conn *conn)
|
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{
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struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
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|
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int i;
|
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/* no need to keep it in a var, we are after login so if this should
|
||||
* be negotiated, by now the result should be available here */
|
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int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS;
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iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num);
|
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|
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/* Check that there is no posted recv or send buffers left - */
|
||||
/* they must be consumed during the login phase */
|
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BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0);
|
||||
BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
|
||||
|
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/* Initial post receive buffers */
|
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for (i = 0; i < initial_post_recv_bufs_num; i++) {
|
||||
if (iser_post_receive_control(conn) != 0) {
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||||
iser_err("Failed to post recv bufs at:%d conn:0x%p\n",
|
||||
i, conn);
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn);
|
||||
return 0;
|
||||
}
|
||||
|
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static int
|
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iser_check_xmit(struct iscsi_conn *conn, void *task)
|
||||
{
|
||||
int rc = 0;
|
||||
struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
||||
|
||||
write_lock_bh(conn->recv_lock);
|
||||
if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) ==
|
||||
ISER_QP_MAX_REQ_DTOS) {
|
||||
iser_dbg("%ld can't xmit task %p, suspending tx\n",jiffies,task);
|
||||
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
||||
rc = -EAGAIN;
|
||||
}
|
||||
write_unlock_bh(conn->recv_lock);
|
||||
return rc;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* iser_send_command - send command PDU
|
||||
*/
|
||||
int iser_send_command(struct iscsi_conn *conn,
|
||||
struct iscsi_cmd_task *ctask)
|
||||
{
|
||||
struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
||||
struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
|
||||
struct iser_dto *send_dto = NULL;
|
||||
unsigned long edtl;
|
||||
int err = 0;
|
||||
struct iser_data_buf *data_buf;
|
||||
|
||||
struct iscsi_cmd *hdr = ctask->hdr;
|
||||
struct scsi_cmnd *sc = ctask->sc;
|
||||
|
||||
if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
|
||||
iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
|
||||
return -EPERM;
|
||||
}
|
||||
if (iser_check_xmit(conn, ctask))
|
||||
return -EAGAIN;
|
||||
|
||||
edtl = ntohl(hdr->data_length);
|
||||
|
||||
/* build the tx desc regd header and add it to the tx desc dto */
|
||||
iser_ctask->desc.type = ISCSI_TX_SCSI_COMMAND;
|
||||
send_dto = &iser_ctask->desc.dto;
|
||||
send_dto->ctask = iser_ctask;
|
||||
iser_create_send_desc(iser_conn, &iser_ctask->desc);
|
||||
|
||||
if (hdr->flags & ISCSI_FLAG_CMD_READ)
|
||||
data_buf = &iser_ctask->data[ISER_DIR_IN];
|
||||
else
|
||||
data_buf = &iser_ctask->data[ISER_DIR_OUT];
|
||||
|
||||
if (sc->use_sg) { /* using a scatter list */
|
||||
data_buf->buf = sc->request_buffer;
|
||||
data_buf->size = sc->use_sg;
|
||||
} else if (sc->request_bufflen) {
|
||||
/* using a single buffer - convert it into one entry SG */
|
||||
sg_init_one(&data_buf->sg_single,
|
||||
sc->request_buffer, sc->request_bufflen);
|
||||
data_buf->buf = &data_buf->sg_single;
|
||||
data_buf->size = 1;
|
||||
}
|
||||
|
||||
data_buf->data_len = sc->request_bufflen;
|
||||
|
||||
if (hdr->flags & ISCSI_FLAG_CMD_READ) {
|
||||
err = iser_prepare_read_cmd(ctask, edtl);
|
||||
if (err)
|
||||
goto send_command_error;
|
||||
}
|
||||
if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
|
||||
err = iser_prepare_write_cmd(ctask,
|
||||
ctask->imm_count,
|
||||
ctask->imm_count +
|
||||
ctask->unsol_count,
|
||||
edtl);
|
||||
if (err)
|
||||
goto send_command_error;
|
||||
}
|
||||
|
||||
iser_reg_single(iser_conn->ib_conn->device,
|
||||
send_dto->regd[0], DMA_TO_DEVICE);
|
||||
|
||||
if (iser_post_receive_control(conn) != 0) {
|
||||
iser_err("post_recv failed!\n");
|
||||
err = -ENOMEM;
|
||||
goto send_command_error;
|
||||
}
|
||||
|
||||
iser_ctask->status = ISER_TASK_STATUS_STARTED;
|
||||
|
||||
err = iser_post_send(&iser_ctask->desc);
|
||||
if (!err)
|
||||
return 0;
|
||||
|
||||
send_command_error:
|
||||
iser_dto_buffs_release(send_dto);
|
||||
iser_err("conn %p failed ctask->itt %d err %d\n",conn, ctask->itt, err);
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_send_data_out - send data out PDU
|
||||
*/
|
||||
int iser_send_data_out(struct iscsi_conn *conn,
|
||||
struct iscsi_cmd_task *ctask,
|
||||
struct iscsi_data *hdr)
|
||||
{
|
||||
struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
||||
struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
|
||||
struct iser_desc *tx_desc = NULL;
|
||||
struct iser_dto *send_dto = NULL;
|
||||
unsigned long buf_offset;
|
||||
unsigned long data_seg_len;
|
||||
unsigned int itt;
|
||||
int err = 0;
|
||||
|
||||
if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
|
||||
iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
if (iser_check_xmit(conn, ctask))
|
||||
return -EAGAIN;
|
||||
|
||||
itt = ntohl(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_alloc(ig.desc_cache, GFP_NOIO);
|
||||
if (tx_desc == NULL) {
|
||||
iser_err("Failed to alloc desc for post dataout\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
tx_desc->type = ISCSI_TX_DATAOUT;
|
||||
memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
|
||||
|
||||
/* build the tx desc regd header and add it to the tx desc dto */
|
||||
send_dto = &tx_desc->dto;
|
||||
send_dto->ctask = iser_ctask;
|
||||
iser_create_send_desc(iser_conn, tx_desc);
|
||||
|
||||
iser_reg_single(iser_conn->ib_conn->device,
|
||||
send_dto->regd[0], DMA_TO_DEVICE);
|
||||
|
||||
/* all data was registered for RDMA, we can use the lkey */
|
||||
iser_dto_add_regd_buff(send_dto,
|
||||
&iser_ctask->rdma_regd[ISER_DIR_OUT],
|
||||
buf_offset,
|
||||
data_seg_len);
|
||||
|
||||
if (buf_offset + data_seg_len > iser_ctask->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_ctask->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(tx_desc);
|
||||
if (!err)
|
||||
return 0;
|
||||
|
||||
send_data_out_error:
|
||||
iser_dto_buffs_release(send_dto);
|
||||
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_mgmt_task *mtask)
|
||||
{
|
||||
struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
||||
struct iser_desc *mdesc = mtask->dd_data;
|
||||
struct iser_dto *send_dto = NULL;
|
||||
unsigned int itt;
|
||||
unsigned long data_seg_len;
|
||||
int err = 0;
|
||||
unsigned char opcode;
|
||||
struct iser_regd_buf *regd_buf;
|
||||
struct iser_device *device;
|
||||
|
||||
if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
|
||||
iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
if (iser_check_xmit(conn,mtask))
|
||||
return -EAGAIN;
|
||||
|
||||
/* build the tx desc regd header and add it to the tx desc dto */
|
||||
mdesc->type = ISCSI_TX_CONTROL;
|
||||
send_dto = &mdesc->dto;
|
||||
send_dto->ctask = NULL;
|
||||
iser_create_send_desc(iser_conn, mdesc);
|
||||
|
||||
device = iser_conn->ib_conn->device;
|
||||
|
||||
iser_reg_single(device, send_dto->regd[0], DMA_TO_DEVICE);
|
||||
|
||||
itt = ntohl(mtask->hdr->itt);
|
||||
opcode = mtask->hdr->opcode & ISCSI_OPCODE_MASK;
|
||||
data_seg_len = ntoh24(mtask->hdr->dlength);
|
||||
|
||||
if (data_seg_len > 0) {
|
||||
regd_buf = &mdesc->data_regd_buf;
|
||||
memset(regd_buf, 0, sizeof(struct iser_regd_buf));
|
||||
regd_buf->device = device;
|
||||
regd_buf->virt_addr = mtask->data;
|
||||
regd_buf->data_size = mtask->data_count;
|
||||
iser_reg_single(device, regd_buf,
|
||||
DMA_TO_DEVICE);
|
||||
iser_dto_add_regd_buff(send_dto, regd_buf,
|
||||
0,
|
||||
data_seg_len);
|
||||
}
|
||||
|
||||
if (iser_post_receive_control(conn) != 0) {
|
||||
iser_err("post_rcv_buff failed!\n");
|
||||
err = -ENOMEM;
|
||||
goto send_control_error;
|
||||
}
|
||||
|
||||
err = iser_post_send(mdesc);
|
||||
if (!err)
|
||||
return 0;
|
||||
|
||||
send_control_error:
|
||||
iser_dto_buffs_release(send_dto);
|
||||
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_desc *rx_desc,
|
||||
unsigned long dto_xfer_len)
|
||||
{
|
||||
struct iser_dto *dto = &rx_desc->dto;
|
||||
struct iscsi_iser_conn *conn = dto->conn;
|
||||
struct iscsi_session *session = conn->iscsi_conn->session;
|
||||
struct iscsi_cmd_task *ctask;
|
||||
struct iscsi_iser_cmd_task *iser_ctask;
|
||||
struct iscsi_hdr *hdr;
|
||||
char *rx_data = NULL;
|
||||
int rx_data_len = 0;
|
||||
unsigned int itt;
|
||||
unsigned char opcode;
|
||||
|
||||
hdr = &rx_desc->iscsi_header;
|
||||
|
||||
iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt);
|
||||
|
||||
if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */
|
||||
rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN;
|
||||
rx_data = dto->regd[1]->virt_addr;
|
||||
rx_data += dto->offset[1];
|
||||
}
|
||||
|
||||
opcode = hdr->opcode & ISCSI_OPCODE_MASK;
|
||||
|
||||
if (opcode == ISCSI_OP_SCSI_CMD_RSP) {
|
||||
itt = hdr->itt & ISCSI_ITT_MASK; /* mask out cid and age bits */
|
||||
if (!(itt < session->cmds_max))
|
||||
iser_err("itt can't be matched to task!!!"
|
||||
"conn %p opcode %d cmds_max %d itt %d\n",
|
||||
conn->iscsi_conn,opcode,session->cmds_max,itt);
|
||||
/* use the mapping given with the cmds array indexed by itt */
|
||||
ctask = (struct iscsi_cmd_task *)session->cmds[itt];
|
||||
iser_ctask = ctask->dd_data;
|
||||
iser_dbg("itt %d ctask %p\n",itt,ctask);
|
||||
iser_ctask->status = ISER_TASK_STATUS_COMPLETED;
|
||||
iser_ctask_rdma_finalize(iser_ctask);
|
||||
}
|
||||
|
||||
iser_dto_buffs_release(dto);
|
||||
|
||||
iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len);
|
||||
|
||||
kfree(rx_desc->data);
|
||||
kmem_cache_free(ig.desc_cache, rx_desc);
|
||||
|
||||
/* 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 */
|
||||
atomic_dec(&conn->ib_conn->post_recv_buf_count);
|
||||
}
|
||||
|
||||
void iser_snd_completion(struct iser_desc *tx_desc)
|
||||
{
|
||||
struct iser_dto *dto = &tx_desc->dto;
|
||||
struct iscsi_iser_conn *iser_conn = dto->conn;
|
||||
struct iscsi_conn *conn = iser_conn->iscsi_conn;
|
||||
struct iscsi_mgmt_task *mtask;
|
||||
|
||||
iser_dbg("Initiator, Data sent dto=0x%p\n", dto);
|
||||
|
||||
iser_dto_buffs_release(dto);
|
||||
|
||||
if (tx_desc->type == ISCSI_TX_DATAOUT)
|
||||
kmem_cache_free(ig.desc_cache, tx_desc);
|
||||
|
||||
atomic_dec(&iser_conn->ib_conn->post_send_buf_count);
|
||||
|
||||
write_lock(conn->recv_lock);
|
||||
if (conn->suspend_tx) {
|
||||
iser_dbg("%ld resuming tx\n",jiffies);
|
||||
clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
||||
scsi_queue_work(conn->session->host, &conn->xmitwork);
|
||||
}
|
||||
write_unlock(conn->recv_lock);
|
||||
|
||||
if (tx_desc->type == ISCSI_TX_CONTROL) {
|
||||
/* this arithmetic is legal by libiscsi dd_data allocation */
|
||||
mtask = (void *) ((long)(void *)tx_desc -
|
||||
sizeof(struct iscsi_mgmt_task));
|
||||
if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
|
||||
struct iscsi_session *session = conn->session;
|
||||
|
||||
spin_lock(&conn->session->lock);
|
||||
list_del(&mtask->running);
|
||||
__kfifo_put(session->mgmtpool.queue, (void*)&mtask,
|
||||
sizeof(void*));
|
||||
spin_unlock(&session->lock);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *iser_ctask)
|
||||
|
||||
{
|
||||
iser_ctask->status = ISER_TASK_STATUS_INIT;
|
||||
|
||||
iser_ctask->dir[ISER_DIR_IN] = 0;
|
||||
iser_ctask->dir[ISER_DIR_OUT] = 0;
|
||||
|
||||
iser_ctask->data[ISER_DIR_IN].data_len = 0;
|
||||
iser_ctask->data[ISER_DIR_OUT].data_len = 0;
|
||||
|
||||
memset(&iser_ctask->rdma_regd[ISER_DIR_IN], 0,
|
||||
sizeof(struct iser_regd_buf));
|
||||
memset(&iser_ctask->rdma_regd[ISER_DIR_OUT], 0,
|
||||
sizeof(struct iser_regd_buf));
|
||||
}
|
||||
|
||||
void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *iser_ctask)
|
||||
{
|
||||
int deferred;
|
||||
|
||||
/* if we were reading, copy back to unaligned sglist,
|
||||
* anyway dma_unmap and free the copy
|
||||
*/
|
||||
if (iser_ctask->data_copy[ISER_DIR_IN].copy_buf != NULL)
|
||||
iser_finalize_rdma_unaligned_sg(iser_ctask, ISER_DIR_IN);
|
||||
if (iser_ctask->data_copy[ISER_DIR_OUT].copy_buf != NULL)
|
||||
iser_finalize_rdma_unaligned_sg(iser_ctask, ISER_DIR_OUT);
|
||||
|
||||
if (iser_ctask->dir[ISER_DIR_IN]) {
|
||||
deferred = iser_regd_buff_release
|
||||
(&iser_ctask->rdma_regd[ISER_DIR_IN]);
|
||||
if (deferred) {
|
||||
iser_err("References remain for BUF-IN rdma reg\n");
|
||||
BUG();
|
||||
}
|
||||
}
|
||||
|
||||
if (iser_ctask->dir[ISER_DIR_OUT]) {
|
||||
deferred = iser_regd_buff_release
|
||||
(&iser_ctask->rdma_regd[ISER_DIR_OUT]);
|
||||
if (deferred) {
|
||||
iser_err("References remain for BUF-OUT rdma reg\n");
|
||||
BUG();
|
||||
}
|
||||
}
|
||||
|
||||
iser_dma_unmap_task_data(iser_ctask);
|
||||
}
|
||||
|
||||
void iser_dto_buffs_release(struct iser_dto *dto)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < dto->regd_vector_len; i++)
|
||||
iser_regd_buff_release(dto->regd[i]);
|
||||
}
|
||||
|
||||
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