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[virtio] Use host-specified MTU when available

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2017-01-23 16:32:54 +00:00
parent de85336abb
commit 4e85b2708f
2 changed files with 37 additions and 13 deletions
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10
src/drivers/net/virtio-net.h
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@@ -4,6 +4,7 @@
/* The feature bitmap for virtio net */
#define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
#define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
#define VIRTIO_NET_F_MTU 3 /* Initial MTU advice */
#define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
#define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
#define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
@@ -25,6 +26,15 @@ struct virtio_net_config
{
/* The config defining mac address (if VIRTIO_NET_F_MAC) */
u8 mac[6];
/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
u16 status;
/* Maximum number of each of transmit and receive queues;
* see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
* Legal values are between 1 and 0x8000
*/
u16 max_virtqueue_pairs;
/* Default maximum transmit unit advice */
u16 mtu;
} __attribute__((packed));
/* This is the first element of the scatter-gather list. If you don't