net/virtio: use any layout for version 1.0

Current virtio driver advertises VERSION_1 support,
but does not handle device's VERSION_1 support when
sending packets (it looks for ANY_LAYOUT feature,
which is absent).

This patch enables 'can_push' in tx path when VERSION_1
is advertised by the device.

This significantly improves small packets forwarding rate
towards devices advertising VERSION_1 feature.

Signed-off-by: Pierre Pfister <ppfister@cisco.com>
Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>

diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index 22d97a4..1e5a6b9 100644 (file)
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -1015,7 +1015,8 @@ virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
                }
 
                /* optimize ring usage */
-               if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
+               if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
+                     vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
                    rte_mbuf_refcnt_read(txm) == 1 &&
                    RTE_MBUF_DIRECT(txm) &&
                    txm->nb_segs == 1 &&