diff options
author | Tonghao Zhang <xiangxia.m.yue@gmail.com> | 2020-10-12 09:58:20 +0800 |
---|---|---|
committer | Jakub Kicinski <kuba@kernel.org> | 2020-10-13 17:27:05 -0700 |
commit | 3618ad2a7c0e78e4258386394d5d5f92a3dbccf8 (patch) | |
tree | 9828906ad4223fea7b342f9566be7572ad80958e /drivers/net | |
parent | c9bf52a173c73be41742c768728e239ffbb63a71 (diff) | |
download | linux-3618ad2a7c0e78e4258386394d5d5f92a3dbccf8.tar.bz2 |
virtio-net: ethtool configurable RXCSUM
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>
Diffstat (limited to 'drivers/net')
-rw-r--r-- | drivers/net/virtio_net.c | 48 |
1 files changed, 36 insertions, 12 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 21b71148c532..d2d2c4a53cf2 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -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; - if ((dev->features ^ features) & NETIF_F_LRO) { - if (vi->xdp_queue_pairs) - return -EBUSY; + /* Don't allow configuration while XDP is active. */ + if (vi->xdp_queue_pairs) + return -EBUSY; + if ((dev->features ^ features) & NETIF_F_LRO) { 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; + offloads &= ~GUEST_OFFLOAD_LRO_MASK; + } - err = virtnet_set_guest_offloads(vi, offloads); - if (err) - return err; - vi->guest_offloads = offloads; + 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; |