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xiangxia.m.yue at gmail.com

2020-Sep-28 03:39 UTC

[PATCH 1/2] virtio-net: don't disable guest csum when disable LRO

From: Tonghao Zhang <xiangxia.m.yue at gmail.com>

Open vSwitch and Linux bridge will disable LRO of the interface
when this interface added to them. Now when disable the LRO, the
virtio-net csum is disable too. That drops the forwarding performance.

Fixes: e59ff2c49ae1 ("virtio-net: disable guest csum during XDP set")
Cc: Michael S. Tsirkin <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: Willem de Bruijn <willemb at google.com>
Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
---
 drivers/net/virtio_net.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 7145c83c6c8c..21b71148c532 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -63,6 +63,11 @@ static const unsigned long guest_offloads[] = {
 	VIRTIO_NET_F_GUEST_CSUM
 };
 
+#define GUEST_OFFLOAD_LRO_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))
+
 struct virtnet_stat_desc {
 	char desc[ETH_GSTRING_LEN];
 	size_t offset;
@@ -2531,7 +2536,8 @@ static int virtnet_set_features(struct net_device *dev,
 		if (features & NETIF_F_LRO)
 			offloads = vi->guest_offloads_capable;
 		else
-			offloads = 0;
+			offloads = vi->guest_offloads_capable &
+				   ~GUEST_OFFLOAD_LRO_MASK;
 
 		err = virtnet_set_guest_offloads(vi, offloads);
 		if (err)
-- 
2.23.0

xiangxia.m.yue at gmail.com

2020-Sep-28 03:39 UTC

head link

[PATCH 2/2] virtio-net: ethtool configurable RXCSUM

From: Tonghao Zhang <xiangxia.m.yue at 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.

Cc: Michael S. Tsirkin <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.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

Willem de Bruijn

2020-Sep-28 08:34 UTC

head link

[PATCH 1/2] virtio-net: don't disable guest csum when disable LRO

On Mon, Sep 28, 2020 at 5:41 AM <xiangxia.m.yue at gmail.com>
wrote:>
> From: Tonghao Zhang <xiangxia.m.yue at gmail.com>
>
> Open vSwitch and Linux bridge will disable LRO of the interface
> when this interface added to them. Now when disable the LRO, the
> virtio-net csum is disable too. That drops the forwarding performance.
>
> Fixes: e59ff2c49ae1 ("virtio-net: disable guest csum during XDP
set")
Patch looks fine to me, but wrong commit here?

That commit disables csum on purpose when enabling xdp with ndp_bpf.

This patch refines disabling LRO with ndo_set_features.

The relevant commit is a02e8964eaf9 ("virtio-net: ethtool configurable
LRO").

If this is a fix, it should target [PATCH net] separately from the
second patch in the patchset, which is a new feature and targets
[PATCH net-next]. They can arguably target net-next together, but then
it should not have a fixes tag.
> Cc: Michael S. Tsirkin <mst at redhat.com>
> Cc: Jason Wang <jasowang at redhat.com>
> Cc: Willem de Bruijn <willemb at google.com>
> Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
> ---
>  drivers/net/virtio_net.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 7145c83c6c8c..21b71148c532 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -63,6 +63,11 @@ static const unsigned long guest_offloads[] = {
>         VIRTIO_NET_F_GUEST_CSUM
>  };
>
> +#define GUEST_OFFLOAD_LRO_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))
> +
>  struct virtnet_stat_desc {
>         char desc[ETH_GSTRING_LEN];
>         size_t offset;
> @@ -2531,7 +2536,8 @@ static int virtnet_set_features(struct net_device
*dev,
>                 if (features & NETIF_F_LRO)
>                         offloads = vi->guest_offloads_capable;
>                 else
> -                       offloads = 0;
> +                       offloads = vi->guest_offloads_capable &
> +                                  ~GUEST_OFFLOAD_LRO_MASK;
>
>                 err = virtnet_set_guest_offloads(vi, offloads);
>                 if (err)
> --
> 2.23.0
>

Willem de Bruijn

2020-Sep-28 08:38 UTC

head link

[PATCH 2/2] virtio-net: ethtool configurable RXCSUM

On Mon, Sep 28, 2020 at 5:42 AM <xiangxia.m.yue at gmail.com>
wrote:>
> From: Tonghao Zhang <xiangxia.m.yue at 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.
>
> Cc: Michael S. Tsirkin <mst at redhat.com>
> Cc: Jason Wang <jasowang at redhat.com>
> Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.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;
>         }
LRO requires receive checksum offload: packets must have their
checksum verified prior to coalescing.

The two features can thus not be configured fully independently.

Tonghao Zhang

2020-Sep-28 09:21 UTC

head link

[PATCH 1/2] virtio-net: don't disable guest csum when disable LRO

On Mon, Sep 28, 2020 at 4:35 PM Willem de Bruijn
<willemdebruijn.kernel at gmail.com> wrote:>
> On Mon, Sep 28, 2020 at 5:41 AM <xiangxia.m.yue at gmail.com> wrote:
> >
> > From: Tonghao Zhang <xiangxia.m.yue at gmail.com>
> >
> > Open vSwitch and Linux bridge will disable LRO of the interface
> > when this interface added to them. Now when disable the LRO, the
> > virtio-net csum is disable too. That drops the forwarding performance.
> >
> > Fixes: e59ff2c49ae1 ("virtio-net: disable guest csum during XDP
set")
>
> Patch looks fine to me, but wrong commit here?
Yes, I will change the tag.> That commit disables csum on purpose when enabling xdp with ndp_bpf.
>
> This patch refines disabling LRO with ndo_set_features.
>
> The relevant commit is a02e8964eaf9 ("virtio-net: ethtool configurable
LRO").
>
> If this is a fix, it should target [PATCH net] separately from the
> second patch in the patchset, which is a new feature and targets
> [PATCH net-next]. They can arguably target net-next together, but then
> it should not have a fixes tag.Thanks, I will send first patch for net, and next one to
net-next.>
> > Cc: Michael S. Tsirkin <mst at redhat.com>
> > Cc: Jason Wang <jasowang at redhat.com>
> > Cc: Willem de Bruijn <willemb at google.com>
> > Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
> > ---
> >  drivers/net/virtio_net.c | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> > index 7145c83c6c8c..21b71148c532 100644
> > --- a/drivers/net/virtio_net.c
> > +++ b/drivers/net/virtio_net.c
> > @@ -63,6 +63,11 @@ static const unsigned long guest_offloads[] = {
> >         VIRTIO_NET_F_GUEST_CSUM
> >  };
> >
> > +#define GUEST_OFFLOAD_LRO_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))
> > +
> >  struct virtnet_stat_desc {
> >         char desc[ETH_GSTRING_LEN];
> >         size_t offset;
> > @@ -2531,7 +2536,8 @@ static int virtnet_set_features(struct
net_device *dev,
> >                 if (features & NETIF_F_LRO)
> >                         offloads = vi->guest_offloads_capable;
> >                 else
> > -                       offloads = 0;
> > +                       offloads = vi->guest_offloads_capable &
> > +                                  ~GUEST_OFFLOAD_LRO_MASK;
> >
> >                 err = virtnet_set_guest_offloads(vi, offloads);
> >                 if (err)
> > --
> > 2.23.0
> >


-- 
Best regards, Tonghao

Michael S. Tsirkin

2020-Sep-28 19:21 UTC

head link

[PATCH 1/2] virtio-net: don't disable guest csum when disable LRO

On Mon, Sep 28, 2020 at 11:39:14AM +0800, xiangxia.m.yue at gmail.com
wrote:> From: Tonghao Zhang <xiangxia.m.yue at gmail.com>
> 
> Open vSwitch and Linux bridge will disable LRO of the interface
> when this interface added to them. Now when disable the LRO, the
> virtio-net csum is disable too. That drops the forwarding performance.
> 
> Fixes: e59ff2c49ae1 ("virtio-net: disable guest csum during XDP
set")
I am a bit confused by this tag. Did this change bring about
disabling checksum when LRO is disabled? I am not sure
I follow how ...
> Cc: Michael S. Tsirkin <mst at redhat.com>
> Cc: Jason Wang <jasowang at redhat.com>
> Cc: Willem de Bruijn <willemb at google.com>
> Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
> ---
>  drivers/net/virtio_net.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 7145c83c6c8c..21b71148c532 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -63,6 +63,11 @@ static const unsigned long guest_offloads[] = {
>  	VIRTIO_NET_F_GUEST_CSUM
>  };
>  
> +#define GUEST_OFFLOAD_LRO_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))
> +
>  struct virtnet_stat_desc {
>  	char desc[ETH_GSTRING_LEN];
>  	size_t offset;
> @@ -2531,7 +2536,8 @@ static int virtnet_set_features(struct net_device
*dev,
>  		if (features & NETIF_F_LRO)
>  			offloads = vi->guest_offloads_capable;
>  		else
> -			offloads = 0;
> +			offloads = vi->guest_offloads_capable &
> +				   ~GUEST_OFFLOAD_LRO_MASK;
>  
>  		err = virtnet_set_guest_offloads(vi, offloads);
>  		if (err)
> -- 
> 2.23.0

Michael S. Tsirkin

2020-Sep-28 19:25 UTC

head link

[PATCH 2/2] virtio-net: ethtool configurable RXCSUM

On Mon, Sep 28, 2020 at 11:39:15AM +0800, xiangxia.m.yue at gmail.com
wrote:> From: Tonghao Zhang <xiangxia.m.yue at 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.
> 
> Cc: Michael S. Tsirkin <mst at redhat.com>
> Cc: Jason Wang <jasowang at redhat.com>
> Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.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;
Hmm, what exactly does this do?
> +
> +	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

Tonghao Zhang

2020-Sep-29 01:40 UTC

head link

[PATCH 1/2] virtio-net: don't disable guest csum when disable LRO

On Tue, Sep 29, 2020 at 3:21 AM Michael S. Tsirkin <mst at redhat.com>
wrote:>
> On Mon, Sep 28, 2020 at 11:39:14AM +0800, xiangxia.m.yue at gmail.com
wrote:
> > From: Tonghao Zhang <xiangxia.m.yue at gmail.com>
> >
> > Open vSwitch and Linux bridge will disable LRO of the interface
> > when this interface added to them. Now when disable the LRO, the
> > virtio-net csum is disable too. That drops the forwarding performance.
> >
> > Fixes: e59ff2c49ae1 ("virtio-net: disable guest csum during XDP
set")
>
> I am a bit confused by this tag. Did this change bring about
> disabling checksum when LRO is disabled? I am not sure
> I follow how ...Hi Michael
It's not right fix tag.
The commit a02e8964eaf9 ("virtio-net: ethtool configurable LRO"),
disable the csum, when we disable the LRO
> > Cc: Michael S. Tsirkin <mst at redhat.com>
> > Cc: Jason Wang <jasowang at redhat.com>
> > Cc: Willem de Bruijn <willemb at google.com>
> > Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
> > ---
> >  drivers/net/virtio_net.c | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> > index 7145c83c6c8c..21b71148c532 100644
> > --- a/drivers/net/virtio_net.c
> > +++ b/drivers/net/virtio_net.c
> > @@ -63,6 +63,11 @@ static const unsigned long guest_offloads[] = {
> >       VIRTIO_NET_F_GUEST_CSUM
> >  };
> >
> > +#define GUEST_OFFLOAD_LRO_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))
> > +
> >  struct virtnet_stat_desc {
> >       char desc[ETH_GSTRING_LEN];
> >       size_t offset;
> > @@ -2531,7 +2536,8 @@ static int virtnet_set_features(struct
net_device *dev,
> >               if (features & NETIF_F_LRO)
> >                       offloads = vi->guest_offloads_capable;
> >               else
> > -                     offloads = 0;
> > +                     offloads = vi->guest_offloads_capable &
> > +                                ~GUEST_OFFLOAD_LRO_MASK;
> >
> >               err = virtnet_set_guest_offloads(vi, offloads);
> >               if (err)
> > --
> > 2.23.0
>

-- 
Best regards, Tonghao

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