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iser-target: Rework connection termination 

When we receive an event that triggers connection termination,
we have a a couple of things we may want to do:
1. In case we are already terminating, bailout early
2. In case we are connected but not bound, disconnect and schedule
   a connection cleanup silently (don't reinstate)
3. In case we are connected and bound, disconnect and reinstate the connection

This rework fixes a bug that was detected against a mis-behaved
initiator which rejected our rdma_cm accept, in this stage the
isert_conn is no bound and reinstate caused a bogus dereference.

What's great about this is that we don't need the
post_recv_buf_count anymore, so get rid of it.

Signed-off-by: Jenny Derzhavetz <jennyf@mellanox.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:
Jenny Derzhavetz 2016-02-24 19:24:01 +02:00 committed by Nicholas Bellinger
parent f81bf45820
commit 6d1fba0c2c
2 changed files with 52 additions and 56 deletions
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107
drivers/infiniband/ulp/isert/ib_isert.c
View File

@ -65,6 +65,7 @@ isert_rdma_accept(struct isert_conn *isert_conn);
struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
static void isert_release_work(struct work_struct *work);
static void isert_wait4flush(struct isert_conn *isert_conn);
static inline bool
isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
@ -820,6 +821,25 @@ isert_put_conn(struct isert_conn *isert_conn)
kref_put(&isert_conn->kref, isert_release_kref);
}
static void
isert_handle_unbound_conn(struct isert_conn *isert_conn)
{
struct isert_np *isert_np = isert_conn->cm_id->context;
mutex_lock(&isert_np->mutex);
if (!list_empty(&isert_conn->node)) {
/*
* This means iscsi doesn't know this connection
* so schedule a cleanup ourselves
*/
list_del_init(&isert_conn->node);
isert_put_conn(isert_conn);
complete(&isert_conn->wait);
queue_work(isert_release_wq, &isert_conn->release_work);
}
mutex_unlock(&isert_np->mutex);
}
/**
* isert_conn_terminate() - Initiate connection termination
* @isert_conn: isert connection struct
@ -837,24 +857,19 @@ isert_conn_terminate(struct isert_conn *isert_conn)
{
int err;
switch (isert_conn->state) {
case ISER_CONN_TERMINATING:
break;
case ISER_CONN_UP:
case ISER_CONN_BOUND:
case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
isert_info("Terminating conn %p state %d\n",
isert_conn, isert_conn->state);
isert_conn->state = ISER_CONN_TERMINATING;
err = rdma_disconnect(isert_conn->cm_id);
if (err)
isert_warn("Failed rdma_disconnect isert_conn %p\n",
isert_conn);
break;
default:
isert_warn("conn %p teminating in state %d\n",
isert_conn, isert_conn->state);
}
if (isert_conn->state >= ISER_CONN_TERMINATING)
return;
isert_info("Terminating conn %p state %d\n",
isert_conn, isert_conn->state);
isert_conn->state = ISER_CONN_TERMINATING;
err = rdma_disconnect(isert_conn->cm_id);
if (err)
isert_warn("Failed rdma_disconnect isert_conn %p\n",
isert_conn);
isert_info("conn %p completing wait\n", isert_conn);
complete(&isert_conn->wait);
}
static int
@ -888,30 +903,27 @@ static int
isert_disconnected_handler(struct rdma_cm_id *cma_id,
enum rdma_cm_event_type event)
{
struct isert_np *isert_np = cma_id->context;
struct isert_conn *isert_conn = cma_id->qp->qp_context;
bool terminating = false;
mutex_lock(&isert_conn->mutex);
terminating = (isert_conn->state == ISER_CONN_TERMINATING);
isert_conn_terminate(isert_conn);
switch (isert_conn->state) {
case ISER_CONN_TERMINATING:
break;
case ISER_CONN_UP:
isert_conn_terminate(isert_conn);
isert_wait4flush(isert_conn);
isert_handle_unbound_conn(isert_conn);
break;
case ISER_CONN_BOUND:
case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
break;
default:
isert_warn("conn %p teminating in state %d\n",
isert_conn, isert_conn->state);
}
mutex_unlock(&isert_conn->mutex);
isert_info("conn %p completing wait\n", isert_conn);
complete(&isert_conn->wait);
if (terminating)
goto out;
mutex_lock(&isert_np->mutex);
if (!list_empty(&isert_conn->node)) {
list_del_init(&isert_conn->node);
isert_put_conn(isert_conn);
queue_work(isert_release_wq, &isert_conn->release_work);
}
mutex_unlock(&isert_np->mutex);
out:
return 0;
}
@ -985,13 +997,10 @@ isert_post_recvm(struct isert_conn *isert_conn, u32 count)
rx_wr--;
rx_wr->next = NULL; /* mark end of work requests list */
isert_conn->post_recv_buf_count += count;
ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
&rx_wr_failed);
if (ret) {
if (ret)
isert_err("ib_post_recv() failed with ret: %d\n", ret);
isert_conn->post_recv_buf_count -= count;
}
return ret;
}
@ -1007,12 +1016,9 @@ isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
rx_wr.num_sge = 1;
rx_wr.next = NULL;
isert_conn->post_recv_buf_count++;
ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
if (ret) {
if (ret)
isert_err("ib_post_recv() failed with ret: %d\n", ret);
isert_conn->post_recv_buf_count--;
}
return ret;
}
@ -1132,12 +1138,9 @@ isert_rdma_post_recvl(struct isert_conn *isert_conn)
rx_wr.sg_list = &sge;
rx_wr.num_sge = 1;
isert_conn->post_recv_buf_count++;
ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
if (ret) {
if (ret)
isert_err("ib_post_recv() failed: %d\n", ret);
isert_conn->post_recv_buf_count--;
}
return ret;
}
@ -1633,7 +1636,6 @@ isert_rcv_completion(struct iser_rx_desc *desc,
ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
DMA_FROM_DEVICE);
isert_conn->post_recv_buf_count--;
}
static int
@ -2073,11 +2075,6 @@ isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc)
isert_unmap_tx_desc(desc, ib_dev);
else
isert_completion_put(desc, isert_cmd, ib_dev, true);
} else {
isert_conn->post_recv_buf_count--;
if (!isert_conn->post_recv_buf_count &&
isert_conn->state >= ISER_CONN_BOUND)
iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
}
}

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

@ -180,7 +180,6 @@ struct isert_device;
struct isert_conn {
enum iser_conn_state state;
int post_recv_buf_count;
u32 responder_resources;
u32 initiator_depth;
bool pi_support;