linux-kernel - Re: [PATCH net-next] net/packet: Improve the comment about LL header visibility criteria

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Message-ID: <CA+FuTScLTZqZhNU7bWEw4OMTQzcKV106iRLwA--La0uH+JrTtg@mail.gmail.com>
Date:   Fri, 5 Feb 2021 21:51:36 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Xie He <xie.he.0141@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        John Ogness <john.ogness@...utronix.de>,
        Tanner Love <tannerlove@...gle.com>,
        Eyal Birger <eyal.birger@...il.com>,
        Network Development <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net/packet: Improve the comment about LL header
 visibility criteria

On Fri, Feb 5, 2021 at 5:42 PM Xie He <xie.he.0141@...il.com> wrote:
>
> The "dev_has_header" function, recently added in
> commit d549699048b4 ("net/packet: fix packet receive on L3 devices
> without visible hard header"),
> is more accurate as criteria for determining whether a device exposes
> the LL header to upper layers, because in addition to dev->header_ops,
> it also checks for dev->header_ops->create.
>
> When transmitting an skb on a device, dev_hard_header can be called to
> generate an LL header. dev_hard_header will only generate a header if
> dev->header_ops->create is present.
>
> Signed-off-by: Xie He <xie.he.0141@...il.com>

Acked-by: Willem de Bruijn <willemb@...gle.com>

Indeed, existence of dev->header_ops->create is the deciding factor. Thanks Xie.