netdev - Re: [PATCH net-next 2/2] samples/bpf: add gre sequence number test.

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Date:   Thu, 1 Mar 2018 09:19:38 -0800
From:   William Tu <u9012063@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH net-next 2/2] samples/bpf: add gre sequence number test.

On Thu, Mar 1, 2018 at 2:30 AM, Daniel Borkmann <daniel@...earbox.net> wrote:
> On 03/01/2018 01:11 AM, William Tu wrote:
>> The patch adds tests for GRE sequence number
>> support for metadata mode tunnel.
>>
>> Signed-off-by: William Tu <u9012063@...il.com>
>> ---
>>  samples/bpf/tcbpf2_kern.c      | 6 ++++--
>>  samples/bpf/test_tunnel_bpf.sh | 4 ++--
>>  2 files changed, 6 insertions(+), 4 deletions(-)
>>
>> diff --git a/samples/bpf/tcbpf2_kern.c b/samples/bpf/tcbpf2_kern.c
>> index efdc16d195ff..f9d0db2be21b 100644
>> --- a/samples/bpf/tcbpf2_kern.c
>> +++ b/samples/bpf/tcbpf2_kern.c
>> @@ -52,7 +52,8 @@ int _gre_set_tunnel(struct __sk_buff *skb)
>>       key.tunnel_tos = 0;
>>       key.tunnel_ttl = 64;
>>
>> -     ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX);
>> +     ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
>> +                                  BPF_F_ZERO_CSUM_TX | BPF_F_GRE_SEQ);
>>       if (ret < 0) {
>>               ERROR(ret);
>>               return TC_ACT_SHOT;
>> @@ -92,7 +93,8 @@ int _ip6gretap_set_tunnel(struct __sk_buff *skb)
>>       key.tunnel_label = 0xabcde;
>>
>>       ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
>> -                                  BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX);
>> +                                  BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
>> +                                  BPF_F_GRE_SEQ);
>>       if (ret < 0) {
>>               ERROR(ret);
>>               return TC_ACT_SHOT;
>> diff --git a/samples/bpf/test_tunnel_bpf.sh b/samples/bpf/test_tunnel_bpf.sh
>> index 43ce049996ee..01a07fb9efa9 100755
>> --- a/samples/bpf/test_tunnel_bpf.sh
>> +++ b/samples/bpf/test_tunnel_bpf.sh
>
> Can be as follow-up, but if you have a chance of moving this into BPF kselftests,
> this would be really great. Otherwise this will get little actual test coverage.
>
> Thanks,
> Daniel
>

Yes, this tunnel test is getting bigger and bigger, and it's better to
move to ksefltests.
I will work on it this month.
Thanks!
William