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virtio-net: ethtool configurable RXCSUM

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Allow user configuring RXCSUM separately with ethtool -K,
reusing the existing virtnet_set_guest_offloads helper
that configures RXCSUM for XDP. This is conditional on
VIRTIO_NET_F_CTRL_GUEST_OFFLOADS.

If Rx checksum is disabled, LRO should also be disabled.

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20201012015820.62042-1-xiangxia.m.yue@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Tonghao Zhang 2020-10-12 09:58:20 +08:00 committed by Jakub Kicinski
parent c9bf52a173
commit 3618ad2a7c
1 changed files with 37 additions and 13 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

50
drivers/net/virtio_net.c
View file

@ -68,6 +68,8 @@ static const unsigned long guest_offloads[] = {
(1ULL << VIRTIO_NET_F_GUEST_ECN) | \
(1ULL << VIRTIO_NET_F_GUEST_UFO))
#define GUEST_OFFLOAD_CSUM_MASK (1ULL << VIRTIO_NET_F_GUEST_CSUM)
struct virtnet_stat_desc {
char desc[ETH_GSTRING_LEN];
size_t offset;
@ -2522,29 +2524,48 @@ static int virtnet_get_phys_port_name(struct net_device *dev, char *buf,
return 0;
}
static netdev_features_t virtnet_fix_features(struct net_device *netdev,
netdev_features_t features)
{
/* If Rx checksum is disabled, LRO should also be disabled. */
if (!(features & NETIF_F_RXCSUM))
features &= ~NETIF_F_LRO;
return features;
}
static int virtnet_set_features(struct net_device *dev,
netdev_features_t features)
{
struct virtnet_info *vi = netdev_priv(dev);
u64 offloads;
u64 offloads = vi->guest_offloads;
int err;
/* Don't allow configuration while XDP is active. */
if (vi->xdp_queue_pairs)
return -EBUSY;
if ((dev->features ^ features) & NETIF_F_LRO) {
if (vi->xdp_queue_pairs)
return -EBUSY;
if (features & NETIF_F_LRO)
offloads = vi->guest_offloads_capable;
offloads |= GUEST_OFFLOAD_LRO_MASK &
vi->guest_offloads_capable;
else
offloads = vi->guest_offloads_capable &
~GUEST_OFFLOAD_LRO_MASK;
err = virtnet_set_guest_offloads(vi, offloads);
if (err)
return err;
vi->guest_offloads = offloads;
offloads &= ~GUEST_OFFLOAD_LRO_MASK;
}
if ((dev->features ^ features) & NETIF_F_RXCSUM) {
if (features & NETIF_F_RXCSUM)
offloads |= GUEST_OFFLOAD_CSUM_MASK &
vi->guest_offloads_capable;
else
offloads &= ~GUEST_OFFLOAD_CSUM_MASK;
}
err = virtnet_set_guest_offloads(vi, offloads);
if (err)
return err;
vi->guest_offloads = offloads;
return 0;
}
@ -2563,6 +2584,7 @@ static const struct net_device_ops virtnet_netdev = {
.ndo_features_check = passthru_features_check,
.ndo_get_phys_port_name = virtnet_get_phys_port_name,
.ndo_set_features = virtnet_set_features,
.ndo_fix_features = virtnet_fix_features,
};
static void virtnet_config_changed_work(struct work_struct *work)
@ -3013,8 +3035,10 @@ static int virtnet_probe(struct virtio_device *vdev)
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))
if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
dev->hw_features |= NETIF_F_RXCSUM;
dev->hw_features |= NETIF_F_LRO;
}
dev->vlan_features = dev->features;