netdev - Re: [PATCH bpf-next 2/3] veth: rework veth_xdp_rcv

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Message-ID: <20220211170414.7223ff09@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 11 Feb 2022 17:04:14 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, davem@...emloft.net,
        ast@...nel.org, daniel@...earbox.net, brouer@...hat.com,
        toke@...hat.com, pabeni@...hat.com, echaudro@...hat.com,
        lorenzo.bianconi@...hat.com, toshiaki.makita1@...il.com,
        andrii@...nel.org
Subject: Re: [PATCH bpf-next 2/3] veth: rework veth_xdp_rcv_skb in order to
 accept non-linear skb

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.