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Date: Mon, 28 Sep 2020 11:39:15 +0800 From: xiangxia.m.yue@...il.com To: jasowang@...hat.com, mst@...hat.com Cc: virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org, Tonghao Zhang <xiangxia.m.yue@...il.com> Subject: [PATCH 2/2] virtio-net: ethtool configurable RXCSUM From: Tonghao Zhang <xiangxia.m.yue@...il.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. Cc: Michael S. Tsirkin <mst@...hat.com> Cc: Jason Wang <jasowang@...hat.com> Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com> --- drivers/net/virtio_net.c | 40 ++++++++++++++++++++++++++++------------ 1 file changed, 28 insertions(+), 12 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 21b71148c532..2e3af0b2c281 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; @@ -2526,25 +2528,37 @@ 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 & + vi->guest_offloads_capable; 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; 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; + else + offloads &= ~GUEST_OFFLOAD_CSUM_MASK; } + if (offloads == (vi->guest_offloads & + vi->guest_offloads_capable)) + return 0; + + err = virtnet_set_guest_offloads(vi, offloads); + if (err) + return err; + + vi->guest_offloads = offloads; return 0; } @@ -3013,8 +3027,10 @@ 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
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