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virtio_net: enable big packets for large MTU values

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If one enables e.g. jumbo frames without mergeable
buffers, packets won't fit in 1500 byte buffers
we use. Switch to big packet mode instead.
TODO: make sizing more exact, possibly extend small
packet mode to use larger pages.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2017-03-08 02:14:25 +02:00
parent a71c9a1c77
commit 2e123b44a3
1 changed files with 4 additions and 0 deletions
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4
drivers/net/virtio_net.c
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@ -2367,6 +2367,10 @@ static int virtnet_probe(struct virtio_device *vdev)
dev->mtu = mtu;
dev->max_mtu = mtu;
}
/* TODO: size buffers correctly in this case. */
if (dev->mtu > ETH_DATA_LEN)
vi->big_packets = true;
}
if (vi->any_header_sg)