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virtio-net: add linkspeed and duplex settings to virtio-net

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Although linkspeed and duplex can be set in a linux guest via 'ethtool -s',
this requires custom ethtool commands for virtio-net by default.

Introduce a new feature flag, VIRTIO_NET_F_SPEED_DUPLEX, which allows
the hypervisor to export a linkspeed and duplex setting. The user can
subsequently overwrite it later if desired via: 'ethtool -s'.

Linkspeed and duplex settings can be set as:
'-device virtio-net,speed=10000,duplex=full'

where speed is [0...INT_MAX], and duplex is ["half"|"full"].

Signed-off-by: Jason Baron <jbaron@akamai.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: virtio-dev@lists.oasis-open.org
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Baron 2018-03-07 22:25:41 -05:00 • committed by Michael S. Tsirkin
parent 127833eeea
commit 9473939ed7
2 changed files with 29 additions and 0 deletions
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3
include/hw/virtio/virtio-net.h
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@ -38,6 +38,9 @@ typedef struct virtio_net_conf
uint16_t rx_queue_size;
uint16_t tx_queue_size;
uint16_t mtu;
int32_t speed;
char *duplex_str;
uint8_t duplex;
} virtio_net_conf;
/* Maximum packet size we can receive from tap device: header + 64k */