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iscsi,iser-target: Initiate termination only once

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Since commit 0fc4ea701f ("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@gmail.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Cc: <stable@vger.kernel.org> # v3.10+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Sagi Grimberg 2014-12-02 16:57:17 +02:00 committed by Nicholas Bellinger
parent 13ba564c95
commit 954f23722b
3 changed files with 54 additions and 34 deletions
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84
drivers/infiniband/ulp/isert/ib_isert.c
View File

@ -777,6 +777,33 @@ 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)
{
@ -785,33 +812,15 @@ 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;
@ -824,18 +833,24 @@ 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);
@ -853,11 +868,14 @@ 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;
@ -2046,7 +2064,7 @@ 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);
@ -3219,10 +3237,6 @@ 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 && !isert_conn->disconnect) {
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..
@ -3231,13 +3245,17 @@ 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);
}

1
drivers/infiniband/ulp/isert/ib_isert.h
View File

@ -150,7 +150,6 @@ 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

3
drivers/target/iscsi/iscsi_target_login.c
View File

@ -1204,6 +1204,9 @@ 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);