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dpdk patch: virtio: tx with can_push when VERSION_1 is set

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This patch for dpdk 16.11 enables the use of shallow
virtio descriptors when VERSION_1 is set.

More info on DPDK patchwork:
  http://dpdk.org/dev/patchwork/patch/17340/

Change-Id: I28cde77ed5a3588921d00da50678debfe0338b08
Signed-off-by: Pierre Pfister <ppfister@cisco.com>
This commit is contained in:
Pierre Pfister
2016-11-30 09:21:05 +00:00
committed by Damjan Marion
parent 6929ea9225
commit 865d6ba8a3
1 changed files with 38 additions and 0 deletions
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38
dpdk/dpdk-16.11_patches/0001-virtio-tx-with-can_push-when-VERSION_1-is-set.patch Normal file
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@ -0,0 +1,38 @@
From b002b56c0c8a1790549c23d93f3d57ffc212c6da Mon Sep 17 00:00:00 2001
From: Pierre Pfister <ppfister@cisco.com>
Date: Tue, 8 Nov 2016 10:24:48 +0100
Subject: [PATCH] virtio: tx with can_push when VERSION_1 is set
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>
---
drivers/net/virtio/virtio_rxtx.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index 22d97a4..1e5a6b9 100644
--- 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 &&
--
2.7.4 (Apple Git-66)