netdev - RE: [PATCH v4 bpf-next 1/3] net: veth: account total xdp_frame len running ndo_xdp

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Message-ID: <62302509c2ca6_1301920891@john.notmuch>
Date:   Mon, 14 Mar 2022 22:32:57 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>, bpf@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, 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 v4 bpf-next 1/3] net: veth: account total xdp_frame len
 running ndo_xdp_xmit

Lorenzo Bianconi wrote:
> Even if this is a theoretical issue since it is not possible to perform
> XDP_REDIRECT on a non-linear xdp_frame, veth driver does not account
> paged area in ndo_xdp_xmit function pointer.
> Introduce xdp_get_frame_len utility routine to get the xdp_frame full
> length and account total frame size running XDP_REDIRECT of a
> non-linear xdp frame into a veth device.
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---

Acked-by: John Fastabend <john.fastabend@...il.com>