No need to allocate these at connection establishment since
it is not guaranteed that all the IOs on that connection will
be to a PI formatted device.
We can do it in a lazy fashion so the initial burst will have a
transient slow down, but very fast all IOs will allocate a PI
context.
This makes the very annoying t10-pi tpgt attribute a noop
attribute.
Cc: <stable@xxxxxxxxxxxxxxx> # 3.15+
Signed-off-by: Sagi Grimberg <sagig@xxxxxxxxxxxx>
---
drivers/infiniband/ulp/isert/ib_isert.c | 49 ++++++++++++-------------------
1 files changed, 19 insertions(+), 30 deletions(-)
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 870c735..d79af10 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -96,8 +96,7 @@ isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
}
static int
-isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
- u8 protection)
+isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
{
struct isert_device *device = isert_conn->conn_device;
struct ib_qp_init_attr attr;
@@ -132,7 +131,7 @@ isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
attr.cap.max_recv_sge = 1;
attr.sq_sig_type = IB_SIGNAL_REQ_WR;
attr.qp_type = IB_QPT_RC;
- if (protection)
+ if (device->pi_capable)
attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
@@ -503,7 +502,7 @@ err_pi_ctx:
static int
isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
- struct fast_reg_descriptor *fr_desc, u8 protection)
+ struct fast_reg_descriptor *fr_desc)
{
int ret;
@@ -524,18 +523,10 @@ isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
}
fr_desc->ind |= ISERT_DATA_KEY_VALID;
- if (protection) {
- ret = isert_create_pi_ctx(fr_desc, ib_device, pd);
- if (ret)
- goto err_data_mr;
- }
-
pr_debug("Created fr_desc %p\n", fr_desc);
return 0;
-err_data_mr:
- ib_dereg_mr(fr_desc->data_mr);
err_data_frpl:
ib_free_fast_reg_page_list(fr_desc->data_frpl);
@@ -543,7 +534,7 @@ err_data_frpl:
}
static int
-isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
+isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
{
struct fast_reg_descriptor *fr_desc;
struct isert_device *device = isert_conn->conn_device;
@@ -567,8 +558,7 @@ isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
}
ret = isert_create_fr_desc(device->ib_device,
- isert_conn->conn_pd, fr_desc,
- pi_support);
+ isert_conn->conn_pd, fr_desc);
if (ret) {
pr_err("Failed to create fastreg descriptor err=%d\n",
ret);
@@ -599,7 +589,6 @@ isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
struct isert_device *device;
struct ib_device *ib_dev = cma_id->device;
int ret = 0;
- u8 pi_support;
spin_lock_bh(&np->np_thread_lock);
if (!np->enabled) {
@@ -699,15 +688,7 @@ isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
goto out_mr;
}
- pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
- if (pi_support && !device->pi_capable) {
- pr_err("Protection information requested but not supported, "
- "rejecting connect request\n");
- ret = rdma_reject(cma_id, NULL, 0);
- goto out_mr;
- }
-
- ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
+ ret = isert_conn_setup_qp(isert_conn, cma_id);
if (ret)
goto out_conn_dev;
@@ -1169,11 +1150,7 @@ isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
if (login->login_complete) {
if (!conn->sess->sess_ops->SessionType &&
isert_conn->conn_device->use_fastreg) {
- /* Normal Session and fastreg is used */
- u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
-
- ret = isert_conn_create_fastreg_pool(isert_conn,
- pi_support);
+ ret = isert_conn_create_fastreg_pool(isert_conn);
if (ret) {
pr_err("Conn: %p failed to create"
" fastreg pool\n", isert_conn);
@@ -2865,9 +2842,21 @@ isert_handle_prot_cmd(struct isert_conn *isert_conn,
struct isert_cmd *isert_cmd,
struct isert_rdma_wr *wr)
{
+ struct isert_device *device = isert_conn->conn_device;
struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
int ret;
+ if (!wr->fr_desc->pi_ctx) {
+ ret = isert_create_pi_ctx(wr->fr_desc,
+ device->ib_device,
+ isert_conn->conn_pd);
+ if (ret) {
+ pr_err("conn %p failed to allocate pi_ctx\n",
+ isert_conn);
+ return ret;
+ }
+ }
+
if (se_cmd->t_prot_sg) {
ret = isert_map_data_buf(isert_conn, isert_cmd,
se_cmd->t_prot_sg,
--
1.7.1
--
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