--- /dev/null
+/*
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/kfifo.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+
+#include "iscsi_iser.h"
+
+/* Register user buffer memory and initialize passive rdma
+ * dto descriptor. Data size is stored in
+ * task->data[ISER_DIR_IN].data_len, Protection size
+ * os stored in task->prot[ISER_DIR_IN].data_len
+ */
+static int iser_prepare_read_cmd(struct iscsi_task *task)
+
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_device *device = iser_task->iser_conn->ib_conn.device;
+ struct iser_mem_reg *mem_reg;
+ int err;
+ struct iser_hdr *hdr = &iser_task->desc.iser_header;
+ struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN];
+
+ err = iser_dma_map_task_data(iser_task,
+ buf_in,
+ ISER_DIR_IN,
+ DMA_FROM_DEVICE);
+ if (err)
+ return err;
+
+ if (scsi_prot_sg_count(iser_task->sc)) {
+ struct iser_data_buf *pbuf_in = &iser_task->prot[ISER_DIR_IN];
+
+ err = iser_dma_map_task_data(iser_task,
+ pbuf_in,
+ ISER_DIR_IN,
+ DMA_FROM_DEVICE);
+ if (err)
+ return err;
+ }
+
+ err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_IN);
+ if (err) {
+ iser_err("Failed to set up Data-IN RDMA\n");
+ return err;
+ }
+ mem_reg = &iser_task->rdma_reg[ISER_DIR_IN];
+
+ hdr->flags |= ISER_RSV;
+ hdr->read_stag = cpu_to_be32(mem_reg->rkey);
+ hdr->read_va = cpu_to_be64(mem_reg->sge.addr);
+
+ iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
+ task->itt, mem_reg->rkey,
+ (unsigned long long)mem_reg->sge.addr);
+
+ return 0;
+}
+
+/* Register user buffer memory and initialize passive rdma
+ * dto descriptor. Data size is stored in
+ * task->data[ISER_DIR_OUT].data_len, Protection size
+ * is stored at task->prot[ISER_DIR_OUT].data_len
+ */
+static int
+iser_prepare_write_cmd(struct iscsi_task *task,
+ unsigned int imm_sz,
+ unsigned int unsol_sz,
+ unsigned int edtl)
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_device *device = iser_task->iser_conn->ib_conn.device;
+ struct iser_mem_reg *mem_reg;
+ int err;
+ struct iser_hdr *hdr = &iser_task->desc.iser_header;
+ struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
+ struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
+
+ err = iser_dma_map_task_data(iser_task,
+ buf_out,
+ ISER_DIR_OUT,
+ DMA_TO_DEVICE);
+ if (err)
+ return err;
+
+ if (scsi_prot_sg_count(iser_task->sc)) {
+ struct iser_data_buf *pbuf_out = &iser_task->prot[ISER_DIR_OUT];
+
+ err = iser_dma_map_task_data(iser_task,
+ pbuf_out,
+ ISER_DIR_OUT,
+ DMA_TO_DEVICE);
+ if (err)
+ return err;
+ }
+
+ err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_OUT);
+ if (err != 0) {
+ iser_err("Failed to register write cmd RDMA mem\n");
+ return err;
+ }
+
+ mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
+
+ if (unsol_sz < edtl) {
+ hdr->flags |= ISER_WSV;
+ hdr->write_stag = cpu_to_be32(mem_reg->rkey);
+ hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz);
+
+ iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X "
+ "VA:%#llX + unsol:%d\n",
+ task->itt, mem_reg->rkey,
+ (unsigned long long)mem_reg->sge.addr, unsol_sz);
+ }
+
+ if (imm_sz > 0) {
+ iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
+ task->itt, imm_sz);
+ tx_dsg->addr = mem_reg->sge.addr;
+ tx_dsg->length = imm_sz;
+ tx_dsg->lkey = mem_reg->sge.lkey;
+ iser_task->desc.num_sge = 2;
+ }
+
+ return 0;
+}
+
+/* creates a new tx descriptor and adds header regd buffer */
+static void iser_create_send_desc(struct iser_conn *iser_conn,
+ struct iser_tx_desc *tx_desc)
+{
+ struct iser_device *device = iser_conn->ib_conn.device;
+
+ ib_dma_sync_single_for_cpu(device->ib_device,
+ tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
+
+ memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
+ tx_desc->iser_header.flags = ISER_VER;
+
+ tx_desc->num_sge = 1;
+
+ if (tx_desc->tx_sg[0].lkey != device->mr->lkey) {
+ tx_desc->tx_sg[0].lkey = device->mr->lkey;
+ iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc);
+ }
+}
+
+static void iser_free_login_buf(struct iser_conn *iser_conn)
+{
+ struct iser_device *device = iser_conn->ib_conn.device;
+
+ if (!iser_conn->login_buf)
+ return;
+
+ if (iser_conn->login_req_dma)
+ ib_dma_unmap_single(device->ib_device,
+ iser_conn->login_req_dma,
+ ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
+
+ if (iser_conn->login_resp_dma)
+ ib_dma_unmap_single(device->ib_device,
+ iser_conn->login_resp_dma,
+ ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
+
+ kfree(iser_conn->login_buf);
+
+ /* make sure we never redo any unmapping */
+ iser_conn->login_req_dma = 0;
+ iser_conn->login_resp_dma = 0;
+ iser_conn->login_buf = NULL;
+}
+
+static int iser_alloc_login_buf(struct iser_conn *iser_conn)
+{
+ struct iser_device *device = iser_conn->ib_conn.device;
+ int req_err, resp_err;
+
+ BUG_ON(device == NULL);
+
+ iser_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
+ ISER_RX_LOGIN_SIZE, GFP_KERNEL);
+ if (!iser_conn->login_buf)
+ goto out_err;
+
+ iser_conn->login_req_buf = iser_conn->login_buf;
+ iser_conn->login_resp_buf = iser_conn->login_buf +
+ ISCSI_DEF_MAX_RECV_SEG_LEN;
+
+ iser_conn->login_req_dma = ib_dma_map_single(device->ib_device,
+ iser_conn->login_req_buf,
+ ISCSI_DEF_MAX_RECV_SEG_LEN,
+ DMA_TO_DEVICE);
+
+ iser_conn->login_resp_dma = ib_dma_map_single(device->ib_device,
+ iser_conn->login_resp_buf,
+ ISER_RX_LOGIN_SIZE,
+ DMA_FROM_DEVICE);
+
+ req_err = ib_dma_mapping_error(device->ib_device,
+ iser_conn->login_req_dma);
+ resp_err = ib_dma_mapping_error(device->ib_device,
+ iser_conn->login_resp_dma);
+
+ if (req_err || resp_err) {
+ if (req_err)
+ iser_conn->login_req_dma = 0;
+ if (resp_err)
+ iser_conn->login_resp_dma = 0;
+ goto free_login_buf;
+ }
+ return 0;
+
+free_login_buf:
+ iser_free_login_buf(iser_conn);
+
+out_err:
+ iser_err("unable to alloc or map login buf\n");
+ return -ENOMEM;
+}
+
+int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
+ struct iscsi_session *session)
+{
+ int i, j;
+ u64 dma_addr;
+ struct iser_rx_desc *rx_desc;
+ struct ib_sge *rx_sg;
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+
+ iser_conn->qp_max_recv_dtos = session->cmds_max;
+ iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */
+ iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2;
+
+ if (device->iser_alloc_rdma_reg_res(ib_conn, session->scsi_cmds_max))
+ goto create_rdma_reg_res_failed;
+
+ if (iser_alloc_login_buf(iser_conn))
+ goto alloc_login_buf_fail;
+
+ iser_conn->num_rx_descs = session->cmds_max;
+ iser_conn->rx_descs = kmalloc(iser_conn->num_rx_descs *
+ sizeof(struct iser_rx_desc), GFP_KERNEL);
+ if (!iser_conn->rx_descs)
+ goto rx_desc_alloc_fail;
+
+ rx_desc = iser_conn->rx_descs;
+
+ for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) {
+ dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ if (ib_dma_mapping_error(device->ib_device, dma_addr))
+ goto rx_desc_dma_map_failed;
+
+ rx_desc->dma_addr = dma_addr;
+
+ rx_sg = &rx_desc->rx_sg;
+ rx_sg->addr = rx_desc->dma_addr;
+ rx_sg->length = ISER_RX_PAYLOAD_SIZE;
+ rx_sg->lkey = device->mr->lkey;
+ }
+
+ iser_conn->rx_desc_head = 0;
+ return 0;
+
+rx_desc_dma_map_failed:
+ rx_desc = iser_conn->rx_descs;
+ for (j = 0; j < i; j++, rx_desc++)
+ ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ kfree(iser_conn->rx_descs);
+ iser_conn->rx_descs = NULL;
+rx_desc_alloc_fail:
+ iser_free_login_buf(iser_conn);
+alloc_login_buf_fail:
+ device->iser_free_rdma_reg_res(ib_conn);
+create_rdma_reg_res_failed:
+ iser_err("failed allocating rx descriptors / data buffers\n");
+ return -ENOMEM;
+}
+
+void iser_free_rx_descriptors(struct iser_conn *iser_conn)
+{
+ int i;
+ struct iser_rx_desc *rx_desc;
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+
+ if (device->iser_free_rdma_reg_res)
+ device->iser_free_rdma_reg_res(ib_conn);
+
+ rx_desc = iser_conn->rx_descs;
+ for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)
+ ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ kfree(iser_conn->rx_descs);
+ /* make sure we never redo any unmapping */
+ iser_conn->rx_descs = NULL;
+
+ iser_free_login_buf(iser_conn);
+}
+
+static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
+{
+ struct iser_conn *iser_conn = conn->dd_data;
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct iscsi_session *session = conn->session;
+
+ iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
+ /* check if this is the last login - going to full feature phase */
+ if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
+ return 0;
+
+ /*
+ * Check that there is one posted recv buffer
+ * (for the last login response).
+ */
+ WARN_ON(ib_conn->post_recv_buf_count != 1);
+
+ if (session->discovery_sess) {
+ iser_info("Discovery session, re-using login RX buffer\n");
+ return 0;
+ } else
+ iser_info("Normal session, posting batch of RX %d buffers\n",
+ iser_conn->min_posted_rx);
+
+ /* Initial post receive buffers */
+ if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static inline bool iser_signal_comp(u8 sig_count)
+{
+ return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0);
+}
+
+/**
+ * iser_send_command - send command PDU
+ */
+int iser_send_command(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;
+ unsigned long edtl;
+ int err;
+ struct iser_data_buf *data_buf, *prot_buf;
+ struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
+ struct scsi_cmnd *sc = task->sc;
+ struct iser_tx_desc *tx_desc = &iser_task->desc;
+ u8 sig_count = ++iser_conn->ib_conn.sig_count;
+
+ edtl = ntohl(hdr->data_length);
+
+ /* build the tx desc regd header and add it to the tx desc dto */
+ tx_desc->type = ISCSI_TX_SCSI_COMMAND;
+ iser_create_send_desc(iser_conn, tx_desc);
+
+ if (hdr->flags & ISCSI_FLAG_CMD_READ) {
+ data_buf = &iser_task->data[ISER_DIR_IN];
+ prot_buf = &iser_task->prot[ISER_DIR_IN];
+ } else {
+ data_buf = &iser_task->data[ISER_DIR_OUT];
+ prot_buf = &iser_task->prot[ISER_DIR_OUT];
+ }
+
+ if (scsi_sg_count(sc)) { /* using a scatter list */
+ data_buf->sg = scsi_sglist(sc);
+ data_buf->size = scsi_sg_count(sc);
+ }
+ data_buf->data_len = scsi_bufflen(sc);
+
+ if (scsi_prot_sg_count(sc)) {
+ prot_buf->sg = scsi_prot_sglist(sc);
+ prot_buf->size = scsi_prot_sg_count(sc);
+ prot_buf->data_len = (data_buf->data_len >>
+ ilog2(sc->device->sector_size)) * 8;
+ }
+
+ if (hdr->flags & ISCSI_FLAG_CMD_READ) {
+ err = iser_prepare_read_cmd(task);
+ if (err)
+ goto send_command_error;
+ }
+ if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
+ err = iser_prepare_write_cmd(task,
+ task->imm_count,
+ task->imm_count +
+ task->unsol_r2t.data_length,
+ edtl);
+ if (err)
+ goto send_command_error;
+ }
+
+ iser_task->status = ISER_TASK_STATUS_STARTED;
+
+ err = iser_post_send(&iser_conn->ib_conn, tx_desc,
+ iser_signal_comp(sig_count));
+ if (!err)
+ return 0;
+
+send_command_error:
+ iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
+ return err;
+}
+
+/**
+ * iser_send_data_out - send data out PDU
+ */
+int iser_send_data_out(struct iscsi_conn *conn,
+ struct iscsi_task *task,
+ struct iscsi_data *hdr)
+{
+ struct iser_conn *iser_conn = conn->dd_data;
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_tx_desc *tx_desc = NULL;
+ struct iser_mem_reg *mem_reg;
+ unsigned long buf_offset;
+ unsigned long data_seg_len;
+ uint32_t itt;
+ int err = 0;
+ struct ib_sge *tx_dsg;
+
+ 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);
+
+ mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
+ tx_dsg = &tx_desc->tx_sg[1];
+ tx_dsg->addr = mem_reg->sge.addr + buf_offset;
+ tx_dsg->length = data_seg_len;
+ tx_dsg->lkey = mem_reg->sge.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, true);
+ 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, true);
+ 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;
+ }
+
+ 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_reg[ISER_DIR_IN], 0,
+ sizeof(struct iser_mem_reg));
+ memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,
+ sizeof(struct iser_mem_reg));
+}
+
+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[ISER_DIR_IN].orig_sg) {
+ is_rdma_data_aligned = 0;
+ iser_finalize_rdma_unaligned_sg(iser_task,
+ &iser_task->data[ISER_DIR_IN],
+ ISER_DIR_IN);
+ }
+
+ if (iser_task->data[ISER_DIR_OUT].orig_sg) {
+ is_rdma_data_aligned = 0;
+ iser_finalize_rdma_unaligned_sg(iser_task,
+ &iser_task->data[ISER_DIR_OUT],
+ ISER_DIR_OUT);
+ }
+
+ if (iser_task->prot[ISER_DIR_IN].orig_sg) {
+ is_rdma_prot_aligned = 0;
+ iser_finalize_rdma_unaligned_sg(iser_task,
+ &iser_task->prot[ISER_DIR_IN],
+ ISER_DIR_IN);
+ }
+
+ if (iser_task->prot[ISER_DIR_OUT].orig_sg) {
+ is_rdma_prot_aligned = 0;
+ iser_finalize_rdma_unaligned_sg(iser_task,
+ &iser_task->prot[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],
+ DMA_FROM_DEVICE);
+ if (prot_count && is_rdma_prot_aligned)
+ iser_dma_unmap_task_data(iser_task,
+ &iser_task->prot[ISER_DIR_IN],
+ DMA_FROM_DEVICE);
+ }
+
+ 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],
+ DMA_TO_DEVICE);
+ if (prot_count && is_rdma_prot_aligned)
+ iser_dma_unmap_task_data(iser_task,
+ &iser_task->prot[ISER_DIR_OUT],
+ DMA_TO_DEVICE);
+ }
+}
Code Review / kvmfornfv.git / blobdiff