svn commit: r295918 - head/sys/dev/hyperv/netvsc

[Sepherosa Ziehau]

Author: sephe
Date: Tue Feb 23 09:25:20 2016
New Revision: 295918
URL: https://svnweb.freebsd.org/changeset/base/295918

Log:
  hyperv/hn: Use IFQ_DRV_PREPEND instead of IF_PREPEND
  
  IF_PREPEND promises out-of-order packet sending when the TX desc list
  is depleted. It was overlooked and copied blindly when the transmission
  path was partially rewritten.
  
  MFC after:	1 week
  Sponsored by:	Microsoft OSTC
  Differential Revision:	https://reviews.freebsd.org/D5386

Modified:
  head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c

Modified: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
==============================================================================
--- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c	Tue Feb 23 09:22:00 2016	(r295917)
+++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c	Tue Feb 23 09:25:20 2016	(r295918)
@@ -998,14 +998,14 @@ hn_start_locked(struct hn_tx_ring *txr, 
 			 * dispatch this packet sending (and sending of any
 			 * following up packets) to tx taskqueue.
 			 */
-			IF_PREPEND(&ifp->if_snd, m_head);
+			IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
 			return 1;
 		}
 
 		txd = hn_txdesc_get(txr);
 		if (txd == NULL) {
 			txr->hn_no_txdescs++;
-			IF_PREPEND(&ifp->if_snd, m_head);
+			IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
 			atomic_set_int(&ifp->if_drv_flags, IFF_DRV_OACTIVE);
 			break;
 		}
@@ -1019,7 +1019,7 @@ hn_start_locked(struct hn_tx_ring *txr, 
 		error = hn_send_pkt(ifp, device_ctx, txr, txd);
 		if (__predict_false(error)) {
 			/* txd is freed, but m_head is not */
-			IF_PREPEND(&ifp->if_snd, m_head);
+			IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
 			atomic_set_int(&ifp->if_drv_flags, IFF_DRV_OACTIVE);
 			break;
 		}