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virtio-net: ethtool configurable LRO

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Virtio-net devices negotiate LRO support with the host.
Display the initially negotiated state with ethtool -k.

Also allow configuring it with ethtool -K, reusing the existing
virtnet_set_guest_offloads helper that configures LRO for XDP.
This is conditional on VIRTIO_NET_F_CTRL_GUEST_OFFLOADS.

Virtio-net negotiates TSO4 and TSO6 separately, but ethtool does not
distinguish between the two. Display LRO as on only if any offload
is active.

RTNL is held while calling virtnet_set_features, same as on the path
from virtnet_xdp_set.

Changes v1 -> v2
  - allow ethtool config (-K) only if VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
  - show LRO as enabled if any LRO variant is enabled
  - do not allow configuration while XDP is active
  - differentiate current features from the capable set, to restore
    on XDP down only those features that were active on XDP up
  - move test out of VIRTIO_NET_F_CSUM/TSO branch, which is tx only

Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2018-12-20 17:14:54 -05:00 committed by David S. Miller
parent c3e5336925
commit a02e8964ea
1 changed files with 33 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

33
drivers/net/virtio_net.c
View file

@ -236,6 +236,7 @@ struct virtnet_info {
u32 speed;
unsigned long guest_offloads;
unsigned long guest_offloads_capable;
/* failover when STANDBY feature enabled */
struct failover *failover;
@ -2479,6 +2480,31 @@ static int virtnet_get_phys_port_name(struct net_device *dev, char *buf,
return 0;
}
static int virtnet_set_features(struct net_device *dev,
netdev_features_t features)
{
struct virtnet_info *vi = netdev_priv(dev);
u64 offloads;
int err;
if ((dev->features ^ features) & NETIF_F_LRO) {
if (vi->xdp_queue_pairs)
return -EBUSY;
if (features & NETIF_F_LRO)
offloads = vi->guest_offloads_capable;
else
offloads = 0;
err = virtnet_set_guest_offloads(vi, offloads);
if (err)
return err;
vi->guest_offloads = offloads;
}
return 0;
}
static const struct net_device_ops virtnet_netdev = {
.ndo_open = virtnet_open,
.ndo_stop = virtnet_close,
@ -2493,6 +2519,7 @@ static const struct net_device_ops virtnet_netdev = {
.ndo_xdp_xmit = virtnet_xdp_xmit,
.ndo_features_check = passthru_features_check,
.ndo_get_phys_port_name = virtnet_get_phys_port_name,
.ndo_set_features = virtnet_set_features,
};
static void virtnet_config_changed_work(struct work_struct *work)
@ -2951,6 +2978,11 @@ static int virtnet_probe(struct virtio_device *vdev)
}
if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
dev->features |= NETIF_F_RXCSUM;
if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6))
dev->features |= NETIF_F_LRO;
if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS))
dev->hw_features |= NETIF_F_LRO;
dev->vlan_features = dev->features;
@ -3080,6 +3112,7 @@ static int virtnet_probe(struct virtio_device *vdev)
for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
if (virtio_has_feature(vi->vdev, guest_offloads[i]))
set_bit(guest_offloads[i], &vi->guest_offloads);
vi->guest_offloads_capable = vi->guest_offloads;
pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
dev->name, max_queue_pairs);