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Add ethtool -g support to virtio_net 

Add support for reporting ring sizes via ethtool -g to the virtio_net
driver.

Signed-off-by: Rick Jones <rick.jones2@hp.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rick Jones 2011-10-19 08:10:59 +00:00 committed by David S. Miller
parent ca35a0ef85
commit 8f9f4668b3
3 changed files with 28 additions and 0 deletions
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13
drivers/net/virtio_net.c
View File

@ -877,8 +877,21 @@ static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
}
static void virtnet_get_ringparam(struct net_device *dev,
struct ethtool_ringparam *ring)
{
struct virtnet_info *vi = netdev_priv(dev);
ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq);
ring->tx_max_pending = virtqueue_get_vring_size(vi->svq);
ring->rx_pending = ring->rx_max_pending;
ring->tx_pending = ring->tx_max_pending;
}
static const struct ethtool_ops virtnet_ethtool_ops = {
.get_link = ethtool_op_get_link,
.get_ringparam = virtnet_get_ringparam,
};
#define MIN_MTU 68

10
drivers/virtio/virtio_ring.c
View File

@ -529,4 +529,14 @@ void vring_transport_features(struct virtio_device *vdev)
}
EXPORT_SYMBOL_GPL(vring_transport_features);
/* return the size of the vring within the virtqueue */
unsigned int virtqueue_get_vring_size(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
return vq->vring.num;
}
EXPORT_SYMBOL_GPL(virtqueue_get_vring_size);
MODULE_LICENSE("GPL");

5
include/linux/virtio.h
View File

@ -61,6 +61,9 @@ struct virtqueue {
* virtqueue_detach_unused_buf: detach first unused buffer
* vq: the struct virtqueue we're talking about.
* Returns NULL or the "data" token handed to add_buf
* virtqueue_get_vring_size: return the size of the virtqueue's vring
* vq: the struct virtqueue containing the vring of interest.
* Returns the size of the vring.
*
* Locking rules are straightforward: the driver is responsible for
* locking. No two operations may be invoked simultaneously, with the exception
@ -97,6 +100,8 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
void *virtqueue_detach_unused_buf(struct virtqueue *vq);
unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
/**
* virtio_device - representation of a device using virtio
* @index: unique position on the virtio bus