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net/virtio: use any layout for version 1.0

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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>
This commit is contained in:
Pierre Pfister 2016-11-30 09:18:42 +00:00 committed by Yuanhan Liu
parent 8c33fc10f6
commit 9edfedf5e4
1 changed files with 2 additions and 1 deletions
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3
drivers/net/virtio/virtio_rxtx.c
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@ -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 &&