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Date:   Sat, 12 Feb 2022 12:03:49 +0100
From:   Lorenzo Bianconi <>
To:     Jakub Kicinski <>
Subject: Re: [PATCH bpf-next 2/3] veth: rework veth_xdp_rcv_skb in order to
 accept non-linear skb

On Feb 11, Jakub Kicinski wrote:
> On Fri, 11 Feb 2022 02:20:31 +0100 Lorenzo Bianconi wrote:
> > +	if (skb_shared(skb) || skb_head_is_locked(skb)) {
> Is this sufficient to guarantee that the frags can be written?
> skb_cow_data() tells a different story.

Do you mean to consider paged part of the skb always not writable, right?
In other words, we should check something like:

	if (skb_shared(skb) || skb_head_is_locked(skb) ||
	    skb_shinfo(skb)->nr_frags) {


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