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RDMA/cxgb4: Turn off db coalescing when RDMA QPs are in use.

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Signed-off-by: Vipul Pandya <vipul@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vipul Pandya
2013-03-14 05:08:59 +00:00
committed by David S. Miller
父節點 f079af7a11
當前提交 3cbdb928e2
共有 4 個文件被更改，包括 42 次插入 和 4 次删除
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20
drivers/infiniband/hw/cxgb4/qp.c
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@@ -42,10 +42,17 @@ static int ocqp_support = 1;
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 @@ int c4iw_destroy_qp(struct ib_qp *ib_qp)
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 @@ struct ib_qp *c4iw_create_qp(struct ib_pd *pd, struct ib_qp_init_attr *attrs,
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)