thr3ads.net - Linux Virtualization - [PATCH 2/2] virtio-net: ethtool configurable RXCSUM [Sep 2020]

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Michael S. Tsirkin

2020-Sep-28 19:25 UTC

[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 01:45 UTC

head link

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

On Tue, Sep 29, 2020 at 3:25 AM Michael S. Tsirkin <mst at redhat.com>
wrote:>
> 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?If the features(lro, rxcsum) we supported, are not changed, it is not
necessary to invoke virtnet_set_guest_offloads.> > +
> > +     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
>

-- 
Best regards, Tonghao

Michael S. Tsirkin

2020-Sep-29 05:55 UTC

head link

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

On Tue, Sep 29, 2020 at 09:45:24AM +0800, Tonghao Zhang
wrote:> On Tue, Sep 29, 2020 at 3:25 AM Michael S. Tsirkin <mst at
redhat.com> wrote:
> >
> > 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?
> If the features(lro, rxcsum) we supported, are not changed, it is not
> necessary to invoke virtnet_set_guest_offloads.
okay, could you describe the cases where this triggers in a bit more
detail pls?
> > > +
> > > +     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
> >
> 
> 
> -- 
> Best regards, Tonghao

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