iser-target: generalize rdma memory registration and cleanup
Current driver uses global dma key to register the memory pointed
by sg list provided by the target core.
This is the preparation step for adding more methods like fast
path memory registration, make the reg/unreg calls be function
pointers.
Signed-off-by: Vu Pham <vu@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 14fd0f4..4c3d660 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -41,6 +41,12 @@
static struct workqueue_struct *isert_comp_wq;
static void
+isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
+static int
+isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
+ struct isert_rdma_wr *wr);
+
+static void
isert_qp_event_callback(struct ib_event *e, void *context)
{
struct isert_conn *isert_conn = (struct isert_conn *)context;
@@ -211,6 +217,10 @@
struct isert_cq_desc *cq_desc;
int ret = 0, i, j;
+ /* asign function handlers */
+ device->reg_rdma_mem = isert_map_rdma;
+ device->unreg_rdma_mem = isert_unmap_cmd;
+
device->cqs_used = min_t(int, num_online_cpus(),
device->ib_device->num_comp_vectors);
device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
@@ -1261,6 +1271,7 @@
struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
struct isert_conn *isert_conn = isert_cmd->conn;
struct iscsi_conn *conn = isert_conn->conn;
+ struct isert_device *device = isert_conn->conn_device;
pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
@@ -1274,7 +1285,7 @@
if (cmd->data_direction == DMA_TO_DEVICE)
iscsit_stop_dataout_timer(cmd);
- isert_unmap_cmd(isert_cmd, isert_conn);
+ device->unreg_rdma_mem(isert_cmd, isert_conn);
transport_generic_free_cmd(&cmd->se_cmd, 0);
break;
case ISCSI_OP_SCSI_TMFUNC:
@@ -1348,9 +1359,10 @@
struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
struct se_cmd *se_cmd = &cmd->se_cmd;
struct isert_conn *isert_conn = isert_cmd->conn;
+ struct isert_device *device = isert_conn->conn_device;
iscsit_stop_dataout_timer(cmd);
- isert_unmap_cmd(isert_cmd, isert_conn);
+ device->unreg_rdma_mem(isert_cmd, isert_conn);
cmd->write_data_done = wr->cur_rdma_length;
pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
@@ -1936,13 +1948,14 @@
struct isert_cmd, iscsi_cmd);
struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+ struct isert_device *device = isert_conn->conn_device;
struct ib_send_wr *wr_failed;
int rc;
pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
isert_cmd, se_cmd->data_length);
wr->iser_ib_op = ISER_IB_RDMA_WRITE;
- rc = isert_map_rdma(conn, cmd, wr);
+ rc = device->reg_rdma_mem(conn, cmd, wr);
if (rc) {
pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
return rc;
@@ -1977,13 +1990,14 @@
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+ struct isert_device *device = isert_conn->conn_device;
struct ib_send_wr *wr_failed;
int rc;
pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
isert_cmd, se_cmd->data_length, cmd->write_data_done);
wr->iser_ib_op = ISER_IB_RDMA_READ;
- rc = isert_map_rdma(conn, cmd, wr);
+ rc = device->reg_rdma_mem(conn, cmd, wr);
if (rc) {
pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
return rc;
diff --git a/drivers/infiniband/ulp/isert/ib_isert.h b/drivers/infiniband/ulp/isert/ib_isert.h
index 21ffd4e..7656503 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.h
+++ b/drivers/infiniband/ulp/isert/ib_isert.h
@@ -128,6 +128,11 @@
struct ib_cq *dev_tx_cq[ISERT_MAX_CQ];
struct isert_cq_desc *cq_desc;
struct list_head dev_node;
+ int (*reg_rdma_mem)(struct iscsi_conn *conn,
+ struct iscsi_cmd *cmd,
+ struct isert_rdma_wr *wr);
+ void (*unreg_rdma_mem)(struct isert_cmd *isert_cmd,
+ struct isert_conn *isert_conn);
};
struct isert_np {