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authorBart Van Assche <bvanassche@acm.org>2019-09-30 16:17:04 -0700
committerJason Gunthorpe <jgg@mellanox.com>2019-10-04 15:35:07 -0300
commit6eaed91c673ad5baa0af8a05dc756f3a457468f3 (patch)
tree03f286eb04539cb46f8a8a0627870574972b0e7c /drivers/infiniband/ulp
parentRDMA/srpt: Improve a debug message (diff)
downloadlinux-dev-6eaed91c673ad5baa0af8a05dc756f3a457468f3.tar.xz
linux-dev-6eaed91c673ad5baa0af8a05dc756f3a457468f3.zip
RDMA/srpt: Rework the approach for closing an RDMA channel
Instead of relying on a waitqueue, report when the identity of an RDMA channel can be reused through a completion. Link: https://lore.kernel.org/r/20190930231707.48259-13-bvanassche@acm.org Cc: Honggang LI <honli@redhat.com> Cc: Laurence Oberman <loberman@redhat.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers/infiniband/ulp')
-rw-r--r--drivers/infiniband/ulp/srpt/ib_srpt.c30
-rw-r--r--drivers/infiniband/ulp/srpt/ib_srpt.h3
2 files changed, 10 insertions, 23 deletions
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index dabaea301328..88e11a250c96 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -1928,41 +1928,22 @@ static int srpt_disconnect_ch(struct srpt_rdma_ch *ch)
return ret;
}
-static bool srpt_ch_closed(struct srpt_port *sport, struct srpt_rdma_ch *ch)
-{
- struct srpt_nexus *nexus;
- struct srpt_rdma_ch *ch2;
- bool res = true;
-
- rcu_read_lock();
- list_for_each_entry(nexus, &sport->nexus_list, entry) {
- list_for_each_entry(ch2, &nexus->ch_list, list) {
- if (ch2 == ch) {
- res = false;
- goto done;
- }
- }
- }
-done:
- rcu_read_unlock();
-
- return res;
-}
-
/* Send DREQ and wait for DREP. */
static void srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch)
{
+ DECLARE_COMPLETION_ONSTACK(closed);
struct srpt_port *sport = ch->sport;
pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num,
ch->state);
+ ch->closed = &closed;
+
mutex_lock(&sport->mutex);
srpt_disconnect_ch(ch);
mutex_unlock(&sport->mutex);
- while (wait_event_timeout(sport->ch_releaseQ, srpt_ch_closed(sport, ch),
- 5 * HZ) == 0)
+ while (wait_for_completion_timeout(&closed, 5 * HZ) == 0)
pr_info("%s(%s-%d state %d): still waiting ...\n", __func__,
ch->sess_name, ch->qp->qp_num, ch->state);
@@ -2089,6 +2070,9 @@ static void srpt_release_channel_work(struct work_struct *w)
list_del_rcu(&ch->list);
mutex_unlock(&sport->mutex);
+ if (ch->closed)
+ complete(ch->closed);
+
srpt_destroy_ch_ib(ch);
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.h b/drivers/infiniband/ulp/srpt/ib_srpt.h
index ee9f20e9177a..d0955bc0343d 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.h
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.h
@@ -264,6 +264,8 @@ enum rdma_ch_state {
* @zw_cqe: Zero-length write CQE.
* @rcu: RCU head.
* @kref: kref for this channel.
+ * @closed: Completion object that will be signaled as soon as a new
+ * channel object with the same identity can be created.
* @rq_size: IB receive queue size.
* @max_rsp_size: Maximum size of an RSP response message in bytes.
* @sq_wr_avail: number of work requests available in the send queue.
@@ -306,6 +308,7 @@ struct srpt_rdma_ch {
struct ib_cqe zw_cqe;
struct rcu_head rcu;
struct kref kref;
+ struct completion *closed;
int rq_size;
u32 max_rsp_size;
atomic_t sq_wr_avail;