RDMA/cxgb4: Turn off db coalescing when RDMA QPs are in use.
Signed-off-by: Vipul Pandya <vipul@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c
index c460244..da4869f 100644
--- a/drivers/infiniband/hw/cxgb4/qp.c
+++ b/drivers/infiniband/hw/cxgb4/qp.c
@@ -42,10 +42,17 @@
module_param(ocqp_support, int, 0644);
MODULE_PARM_DESC(ocqp_support, "Support on-chip SQs (default=1)");
-int db_fc_threshold = 2000;
+int db_fc_threshold = 1000;
module_param(db_fc_threshold, int, 0644);
-MODULE_PARM_DESC(db_fc_threshold, "QP count/threshold that triggers automatic "
- "db flow control mode (default = 2000)");
+MODULE_PARM_DESC(db_fc_threshold,
+ "QP count/threshold that triggers"
+ " automatic db flow control mode (default = 1000)");
+
+int db_coalescing_threshold;
+module_param(db_coalescing_threshold, int, 0644);
+MODULE_PARM_DESC(db_coalescing_threshold,
+ "QP count/threshold that triggers"
+ " disabling db coalescing (default = 0)");
static void set_state(struct c4iw_qp *qhp, enum c4iw_qp_state state)
{
@@ -1448,6 +1455,8 @@
rhp->db_state = NORMAL;
idr_for_each(&rhp->qpidr, enable_qp_db, NULL);
}
+ if (rhp->qpcnt <= db_coalescing_threshold)
+ cxgb4_enable_db_coalescing(rhp->rdev.lldi.ports[0]);
spin_unlock_irq(&rhp->lock);
atomic_dec(&qhp->refcnt);
wait_event(qhp->wait, !atomic_read(&qhp->refcnt));
@@ -1559,11 +1568,14 @@
spin_lock_irq(&rhp->lock);
if (rhp->db_state != NORMAL)
t4_disable_wq_db(&qhp->wq);
- if (++rhp->qpcnt > db_fc_threshold && rhp->db_state == NORMAL) {
+ rhp->qpcnt++;
+ if (rhp->qpcnt > db_fc_threshold && rhp->db_state == NORMAL) {
rhp->rdev.stats.db_state_transitions++;
rhp->db_state = FLOW_CONTROL;
idr_for_each(&rhp->qpidr, disable_qp_db, NULL);
}
+ if (rhp->qpcnt > db_coalescing_threshold)
+ cxgb4_disable_db_coalescing(rhp->rdev.lldi.ports[0]);
ret = insert_handle_nolock(rhp, &rhp->qpidr, qhp, qhp->wq.sq.qid);
spin_unlock_irq(&rhp->lock);
if (ret)