Re: [RFC PATCH 5/5] drivers/net/virtio_net.c: Added USO support.

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在 2022/1/25 下午4:47, Andrew Melnychenko 写道:
Now, it possible to enable GSO_UDP_L4("tx-udp-segmentation") for VirtioNet.

Signed-off-by: Andrew Melnychenko <andrew@xxxxxxxxxx>
---
  drivers/net/virtio_net.c | 22 ++++++++++++++++++----
  1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index a801ea40908f..a45eee022be4 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -60,13 +60,17 @@ static const unsigned long guest_offloads[] = {
  	VIRTIO_NET_F_GUEST_TSO6,
  	VIRTIO_NET_F_GUEST_ECN,
  	VIRTIO_NET_F_GUEST_UFO,
-	VIRTIO_NET_F_GUEST_CSUM
+	VIRTIO_NET_F_GUEST_CSUM,
+	VIRTIO_NET_F_GUEST_USO4,
+	VIRTIO_NET_F_GUEST_USO6
  };
#define GUEST_OFFLOAD_GRO_HW_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
  				(1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
  				(1ULL << VIRTIO_NET_F_GUEST_ECN)  | \
-				(1ULL << VIRTIO_NET_F_GUEST_UFO))
+				(1ULL << VIRTIO_NET_F_GUEST_UFO)  | \
+				(1ULL << VIRTIO_NET_F_GUEST_USO4) | \
+				(1ULL << VIRTIO_NET_F_GUEST_USO6))
struct virtnet_stat_desc {
  	char desc[ETH_GSTRING_LEN];
@@ -2530,7 +2534,9 @@ static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
  	        virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
  	        virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
  		virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) ||
-		virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))) {
+		virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM) ||
+		virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) ||
+		virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6))) {
  		NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM first");
  		return -EOPNOTSUPP;
  	}
@@ -3155,6 +3161,8 @@ static int virtnet_probe(struct virtio_device *vdev)
  			dev->hw_features |= NETIF_F_TSO6;
  		if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
  			dev->hw_features |= NETIF_F_TSO_ECN;
+		if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_USO))
+			dev->hw_features |= NETIF_F_GSO_UDP_L4;
dev->features |= NETIF_F_GSO_ROBUST; @@ -3169,6 +3177,9 @@ static int virtnet_probe(struct virtio_device *vdev)
  		dev->features |= NETIF_F_GRO_HW;
  	if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS))
  		dev->hw_features |= NETIF_F_GRO_HW;
+	if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_USO4) ||
+	    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_USO6))
+		dev->hw_features |= NETIF_F_LRO;


I think we need to use GRO_HW, see dbcf24d153884 ("virtio-net: use NETIF_F_GRO_HW instead of NETIF_F_LRO"

Thanks


dev->vlan_features = dev->features; @@ -3200,7 +3211,9 @@ 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) ||
  	    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
-	    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
+	    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO) ||
+	    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_USO4) ||
+	    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_USO6))
  		vi->big_packets = true;
if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
@@ -3400,6 +3413,7 @@ static struct virtio_device_id id_table[] = {
  	VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
  	VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
  	VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
+	VIRTIO_NET_F_HOST_USO, VIRTIO_NET_F_GUEST_USO4, VIRTIO_NET_F_GUEST_USO6, \
  	VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
  	VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
  	VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \

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