From: Tonghao Zhang <xiangxia.m....@gmail.com> 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. Cc: Michael S. Tsirkin <m...@redhat.com> Cc: Jason Wang <jasow...@redhat.com> Cc: Willem de Bruijn <will...@google.com> Signed-off-by: Tonghao Zhang <xiangxia.m....@gmail.com> Acked-by: Michael S. Tsirkin <m...@redhat.com> --- drivers/net/virtio_net.c | 48 ++++++++++++++++++++++++++++++---------- 1 file 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; -- 2.23.0 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization