netdev - Re: [PATCH net-next v6 09/10] virtio_net: xsk: rx: support recv merge mode

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Date: Thu, 20 Jun 2024 18:57:05 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Paolo Abeni <pabeni@...hat.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>,
 Jason Wang <jasowang@...hat.com>,
 Eugenio Pérez <eperezma@...hat.com>,
 "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>,
 Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 John Fastabend <john.fastabend@...il.com>,
 virtualization@...ts.linux.dev,
 bpf@...r.kernel.org,
 netdev@...r.kernel.org
Subject: Re: [PATCH net-next v6 09/10] virtio_net: xsk: rx: support recv merge mode

On Thu, 20 Jun 2024 12:37:43 +0200, Paolo Abeni <pabeni@...hat.com> wrote:
> On Tue, 2024-06-18 at 15:56 +0800, Xuan Zhuo wrote:
> > Support AF-XDP for merge mode.
> >
> > Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> > ---
> >  drivers/net/virtio_net.c | 139 +++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 139 insertions(+)
> >
> > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> > index 06608d696e2e..cfa106aa8039 100644
> > --- a/drivers/net/virtio_net.c
> > +++ b/drivers/net/virtio_net.c
> > @@ -504,6 +504,10 @@ static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
> >  			       struct net_device *dev,
> >  			       unsigned int *xdp_xmit,
> >  			       struct virtnet_rq_stats *stats);
> > +static struct sk_buff *virtnet_skb_append_frag(struct sk_buff *head_skb,
> > +					       struct sk_buff *curr_skb,
> > +					       struct page *page, void *buf,
> > +					       int len, int truesize);
> >
> >  static bool is_xdp_frame(void *ptr)
> >  {
> > @@ -1128,6 +1132,139 @@ static struct sk_buff *virtnet_receive_xsk_small(struct net_device *dev, struct
> >  	}
> >  }
> >
> > +static void xsk_drop_follow_bufs(struct net_device *dev,
> > +				 struct receive_queue *rq,
> > +				 u32 num_buf,
> > +				 struct virtnet_rq_stats *stats)
> > +{
> > +	struct xdp_buff *xdp;
> > +	u32 len;
> > +
> > +	while (num_buf-- > 1) {
>
> Why do you skip the last buffer? I thought it should be dropped, too?!?

Here, we just need to drop the follow bufs (num_buf - 1). The first one have be
dropped.

Thanks.

>
> Thanks!
>
> Paolo
>