From 2e123b44a3c19de75f40ee0081d6d4fc04adfdc7 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Wed, 8 Mar 2017 02:14:25 +0200 Subject: [PATCH 1/1] virtio_net: enable big packets for large MTU values 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 --- drivers/net/virtio_net.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index ea9890d61967..006f1a603102 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -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) -- 2.39.5