netdev - Re: [PATCH bpf-next v2] bpf: allow BPF read access to qdisc pkt

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Date:   Mon, 3 Dec 2018 21:44:16 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        netdev@...r.kernel.org
Cc:     ast@...nel.org, peterpenkov96@...il.com, vladum@...gle.com,
        liu.song.a23@...il.com, Petar Penkov <ppenkov@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH bpf-next v2] bpf: allow BPF read access to qdisc pkt_len

On 12/03/2018 02:18 AM, Willem de Bruijn wrote:
> From: Petar Penkov <ppenkov@...gle.com>
> 
> The pkt_len field in qdisc_skb_cb stores the skb length as it will
> appear on the wire after segmentation. For byte accounting, this value
> is more accurate than skb->len. It is computed on entry to the TC
> layer, so only valid there.
> 
> Allow read access to this field from BPF tc classifier and action
> programs. The implementation is analogous to tc_classid, aside from
> restricting to read access.
> 
> To distinguish it from skb->len and self-describe export as wire_len.
> 
> Changes v1->v2
>   - Rename pkt_len to wire_len
> 
> Signed-off-by: Petar Penkov <ppenkov@...gle.com>
> Signed-off-by: Vlad Dumitrescu <vladum@...gle.com>
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Applied to bpf-next, thanks!