[PATCH 3.13.y-ckt 119/139] iscsi, iser-target: Initiate termination only once
Kamal Mostafa
kamal at canonical.com
Wed Jan 28 22:21:02 UTC 2015
3.13.11-ckt15 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Sagi Grimberg <sagig at mellanox.com>
commit 954f23722b5753305be490330cf2680b7a25f4a3 upstream.
Since commit 0fc4ea701fcf ("Target/iser: Don't put isert_conn inside
disconnected handler") we put the conn kref in isert_wait_conn, so we
need .wait_conn to be invoked also in the error path.
Introduce call to isert_conn_terminate (called under lock)
which transitions the connection state to TERMINATING and calls
rdma_disconnect. If the state is already teminating, just bail
out back (temination started).
Also, make sure to destroy the connection when getting a connect
error event if didn't get to connected (state UP). Same for the
handling of REJECTED and UNREACHABLE cma events.
Squashed:
iscsi-target: Add call to wait_conn in establishment error flow
Reported-by: Slava Shwartsman <valyushash at gmail.com>
Signed-off-by: Sagi Grimberg <sagig at mellanox.com>
Signed-off-by: Nicholas Bellinger <nab at linux-iscsi.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
drivers/infiniband/ulp/isert/ib_isert.c | 84 +++++++++++++++++++------------
drivers/infiniband/ulp/isert/ib_isert.h | 1 -
drivers/target/iscsi/iscsi_target_login.c | 3 ++
3 files changed, 54 insertions(+), 34 deletions(-)
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 5502c7f..4dbf5e0 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -671,6 +671,33 @@ isert_put_conn(struct isert_conn *isert_conn)
kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
}
+/**
+ * isert_conn_terminate() - Initiate connection termination
+ * @isert_conn: isert connection struct
+ *
+ * Notes:
+ * In case the connection state is UP, move state
+ * to TEMINATING and start teardown sequence (rdma_disconnect).
+ *
+ * This routine must be called with conn_mutex held. Thus it is
+ * safe to call multiple times.
+ */
+static void
+isert_conn_terminate(struct isert_conn *isert_conn)
+{
+ int err;
+
+ if (isert_conn->state == ISER_CONN_UP) {
+ isert_conn->state = ISER_CONN_TERMINATING;
+ pr_info("Terminating conn %p state %d\n",
+ isert_conn, isert_conn->state);
+ err = rdma_disconnect(isert_conn->conn_cm_id);
+ if (err)
+ pr_warn("Failed rdma_disconnect isert_conn %p\n",
+ isert_conn);
+ }
+}
+
static void
isert_disconnect_work(struct work_struct *work)
{
@@ -679,33 +706,15 @@ isert_disconnect_work(struct work_struct *work)
pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
mutex_lock(&isert_conn->conn_mutex);
- if (isert_conn->state == ISER_CONN_UP)
- isert_conn->state = ISER_CONN_TERMINATING;
-
- if (isert_conn->post_recv_buf_count == 0 &&
- atomic_read(&isert_conn->post_send_buf_count) == 0) {
- mutex_unlock(&isert_conn->conn_mutex);
- goto wake_up;
- }
- if (!isert_conn->conn_cm_id) {
- mutex_unlock(&isert_conn->conn_mutex);
- isert_put_conn(isert_conn);
- return;
- }
-
- if (isert_conn->disconnect) {
- /* Send DREQ/DREP towards our initiator */
- rdma_disconnect(isert_conn->conn_cm_id);
- }
-
+ isert_conn_terminate(isert_conn);
mutex_unlock(&isert_conn->conn_mutex);
-wake_up:
+ pr_info("conn %p completing conn_wait\n", isert_conn);
complete(&isert_conn->conn_wait);
}
static int
-isert_disconnected_handler(struct rdma_cm_id *cma_id, bool disconnect)
+isert_disconnected_handler(struct rdma_cm_id *cma_id)
{
struct isert_conn *isert_conn;
@@ -718,18 +727,24 @@ isert_disconnected_handler(struct rdma_cm_id *cma_id, bool disconnect)
isert_conn = (struct isert_conn *)cma_id->context;
- isert_conn->disconnect = disconnect;
INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
schedule_work(&isert_conn->conn_logout_work);
return 0;
}
+static void
+isert_connect_error(struct rdma_cm_id *cma_id)
+{
+ struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
+
+ isert_put_conn(isert_conn);
+}
+
static int
isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
{
int ret = 0;
- bool disconnect = false;
pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
event->event, event->status, cma_id->context, cma_id);
@@ -747,11 +762,14 @@ isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
- disconnect = true;
case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
- ret = isert_disconnected_handler(cma_id, disconnect);
+ ret = isert_disconnected_handler(cma_id);
break;
+ case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
+ case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
case RDMA_CM_EVENT_CONNECT_ERROR:
+ isert_connect_error(cma_id);
+ break;
default:
pr_err("Unhandled RDMA CMA event: %d\n", event->event);
break;
@@ -1770,7 +1788,7 @@ isert_cq_rx_comp_err(struct isert_conn *isert_conn)
msleep(3000);
mutex_lock(&isert_conn->conn_mutex);
- isert_conn->state = ISER_CONN_DOWN;
+ isert_conn_terminate(isert_conn);
mutex_unlock(&isert_conn->conn_mutex);
iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
@@ -2773,10 +2791,6 @@ static void isert_wait_conn(struct iscsi_conn *conn)
pr_debug("isert_wait_conn: Starting \n");
mutex_lock(&isert_conn->conn_mutex);
- if (isert_conn->conn_cm_id) {
- pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
- rdma_disconnect(isert_conn->conn_cm_id);
- }
/*
* Only wait for conn_wait_comp_err if the isert_conn made it
* into full feature phase..
@@ -2785,13 +2799,17 @@ static void isert_wait_conn(struct iscsi_conn *conn)
mutex_unlock(&isert_conn->conn_mutex);
return;
}
- if (isert_conn->state == ISER_CONN_UP)
- isert_conn->state = ISER_CONN_TERMINATING;
+ isert_conn_terminate(isert_conn);
mutex_unlock(&isert_conn->conn_mutex);
wait_for_completion(&isert_conn->conn_wait_comp_err);
-
wait_for_completion(&isert_conn->conn_wait);
+
+ mutex_lock(&isert_conn->conn_mutex);
+ isert_conn->state = ISER_CONN_DOWN;
+ mutex_unlock(&isert_conn->conn_mutex);
+
+ pr_info("Destroying conn %p\n", isert_conn);
isert_put_conn(isert_conn);
}
diff --git a/drivers/infiniband/ulp/isert/ib_isert.h b/drivers/infiniband/ulp/isert/ib_isert.h
index 2b126e0..abbc331 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.h
+++ b/drivers/infiniband/ulp/isert/ib_isert.h
@@ -127,7 +127,6 @@ struct isert_conn {
#define ISERT_COMP_BATCH_COUNT 8
int conn_comp_batch;
struct llist_head conn_comp_llist;
- bool disconnect;
};
#define ISERT_MAX_CQ 64
diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index 1b2db7a..439c534 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -1185,6 +1185,9 @@ old_sess_out:
conn->sock = NULL;
}
+ if (conn->conn_transport->iscsit_wait_conn)
+ conn->conn_transport->iscsit_wait_conn(conn);
+
if (conn->conn_transport->iscsit_free_conn)
conn->conn_transport->iscsit_free_conn(conn);
--
1.9.1
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