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fm10k: reschedule service event if we stall the PF<->SM mailbox 

When we are handling PF<->VF mailbox messages, it is possible that the
VF will send us so many messages that the PF<->SM FIFO will fill up. In
this case, we stop the loop and wait until the service event is
rescheduled.

Normally this should happen due to an interrupt. But it is possible that
we don't get another interrupt for a while and it isn't until the
service timer actually reschedules us. Instead, simply reschedule
immediately which will cause the service event to be run again as soon
as we exit.

This ensures that we promptly handle all of the PF<->VF messages with
minimal delay, while still giving time for the SM mailbox to drain.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jacob Keller 2017-03-08 15:55:43 -08:00 committed by Jeff Kirsher
parent 17a9180994
commit b52b7f7059
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/intel/fm10k/fm10k_iov.c
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@ -143,6 +143,10 @@ s32 fm10k_iov_mbx(struct fm10k_intfc *interface)
if (!hw->mbx.ops.tx_ready(&hw->mbx, FM10K_VFMBX_MSG_MTU)) { if (!hw->mbx.ops.tx_ready(&hw->mbx, FM10K_VFMBX_MSG_MTU)) {
/* keep track of how many times this occurs */ /* keep track of how many times this occurs */
interface->hw_sm_mbx_full++; interface->hw_sm_mbx_full++;
/* make sure we try again momentarily */
fm10k_service_event_schedule(interface);
break; break;
} }