IB/hfi1: Increase packet egress timeout

The current value of 500us for the packet egress timeout is too small
which causes the host to declare failure on draining packets too early
and unnecessarily bounces the link. Increase this to 50ms taking into
account the switch packet discard timer default and the worst case
per-VL package drainage rate.

Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/hfi1/pio.c b/drivers/infiniband/hw/hfi1/pio.c
index e0e1ff2a0c72a37928a13df636da93efc0d6d15a..d4022450b73f7a9c6d8d528fbe44b3dd2fa0e00a 100644 (file)
--- a/drivers/infiniband/hw/hfi1/pio.c
+++ b/drivers/infiniband/hw/hfi1/pio.c
@@ -995,7 +995,7 @@ static void sc_wait_for_packet_egress(struct send_context *sc, int pause)
                /* counter is reset if occupancy count changes */
                if (reg != reg_prev)
                        loop = 0;
-               if (loop > 500) {
+               if (loop > 50000) {
                        /* timed out - bounce the link */
                        dd_dev_err(dd,
                                   "%s: context %u(%u) timeout waiting for packets to egress, remaining count %u, bouncing link\n",