dpdk/dpdk-16.11_patches/0001-virtio-tx-with-can_push-when-VERSION_1-is-set.patch

   1 From b002b56c0c8a1790549c23d93f3d57ffc212c6da Mon Sep 17 00:00:00 2001
   2 From: Pierre Pfister <ppfister@cisco.com>
   3 Date: Tue, 8 Nov 2016 10:24:48 +0100
   4 Subject: [PATCH] virtio: tx with can_push when VERSION_1 is set
   5
   6 Current virtio driver advertises VERSION_1 support,
   7 but does not handle device's VERSION_1 support when
   8 sending packets (it looks for ANY_LAYOUT feature,
   9 which is absent).
  10
  11 This patch enables 'can_push' in tx path when VERSION_1
  12 is advertised by the device.
  13
  14 This significantly improves small packets forwarding rate
  15 towards devices advertising VERSION_1 feature.
  16
  17 Signed-off-by: Pierre Pfister <ppfister@cisco.com>
  18 ---
  19  drivers/net/virtio/virtio_rxtx.c | 3 ++-
  20  1 file changed, 2 insertions(+), 1 deletion(-)
  21
  22 diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
  23 index 22d97a4..1e5a6b9 100644
  24 --- a/drivers/net/virtio/virtio_rxtx.c
  25 +++ b/drivers/net/virtio/virtio_rxtx.c
  26 @@ -1015,7 +1015,8 @@ virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
  27                 }
  28
  29                 /* optimize ring usage */
  30 -               if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
  31 +               if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
  32 +                     vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
  33                     rte_mbuf_refcnt_read(txm) == 1 &&
  34                     RTE_MBUF_DIRECT(txm) &&
  35                     txm->nb_segs == 1 &&
  36 --
  37 2.7.4 (Apple Git-66)
  38