IB/cm: Do not automatically disconnect XRC TGT QPs

Because an XRC TGT QP can end up being shared among multiple
processes, don't have the ib_cm automatically send a DREQ when the
userspace process that owns the ib_cm_id exits.  Disconnect can be
initiated by the user directly; otherwise, the owner of the XRC INI QP
controls the connection.

Note that as a result of the process exiting, the ib_cm will stop
tracking the XRC connection on the target side.  For the purposes of
disconnecting, this isn't a big deal.  The ib_cm will respond to the
DREQ appropriately.  For other messages, mainly LAP, the CM will
reject the request, since there's no one available to route the
request to.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 42a7a9bae44e..4104ea2427c2 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -889,6 +889,8 @@ retest:
                 break;
         case IB_CM_ESTABLISHED:
                 spin_unlock_irq(&cm_id_priv->lock);
+                if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
+                        break;
                 ib_send_cm_dreq(cm_id, NULL, 0);
                 goto retest;
         case IB_CM_DREQ_SENT: