[PATCH] virtio_net: enable big packets for large MTU values

[Michael S. Tsirkin]

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 <m...@redhat.com>
---
 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 e0fb3707..9dc31dc 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2428,6 +2428,10 @@ 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)
-- 
MST