netdev - Re: [PATCH bpf-next v2 2/2] selftests/bpf: expand test_tc

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Date:   Tue, 23 Apr 2019 21:10:03 +0000
From:   Yonghong Song <yhs@...com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "alan.maguire@...cle.com" <alan.maguire@...cle.com>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH bpf-next v2 2/2] selftests/bpf: expand test_tc_tunnel with
 SIT encap



On 4/23/19 11:43 AM, Willem de Bruijn wrote:
> From: Willem de Bruijn <willemb@...gle.com>
> 
> So far, all BPF tc tunnel testcases encapsulate in the same network
> protocol. Add an encap testcase that requires updating skb->protocol.
> 
> The 6in4 tunnel encapsulates an IPv6 packet inside an IPv4 tunnel.
> Verify that bpf_skb_net_grow correctly updates skb->protocol to
> select the right protocol handler in __netif_receive_skb_core.
> 
> The BPF program should also manually update the link layer header to
> encode the right network protocol.
> 
> Changes v1->v2
>    - improve documentation of non-obvious logic
> 
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>
> Tested-by: Alan Maguire <alan.maguire@...cle.com>

Acked-by: Yonghong Song <yhs@...com>