Merge similar fixes from 223198 from igb to ixgbe:

- Use a dedicated task to handle deferred transmits from the if_transmit
  method instead of reusing the existing per-queue interrupt task.
  Reusing the per-queue interrupt task could result in both an interrupt
  thread and the taskqueue thread trying to handle received packets on a
  single queue resulting in out-of-order packet processing and lock
  contention.
- Don't define ixgbe_start() at all where if_transmit is used.

Tested by:	Vijay Singh
Reviewed by:	jfv
MFC after:	2 weeks

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/dev/ixgbe/ixgbe.h b/sys/dev/ixgbe/ixgbe.h
index d167306..f2b40df 100644
--- a/sys/dev/ixgbe/ixgbe.h
+++ b/sys/dev/ixgbe/ixgbe.h
@@ -314,6 +314,7 @@ struct tx_ring {
 	char			mtx_name[16];
 #if __FreeBSD_version >= 800000
 	struct buf_ring		*br;
+	struct task		txq_task;
 #endif
 #ifdef IXGBE_FDIR
 	u16			atr_sample;