netdev - Re: [PATCH RFC bpf-next 1/2] bpf_redirect_neigh: Support supplying the nexthop as a helper parameter

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Date:   Mon, 19 Oct 2020 15:28:51 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Daniel Borkmann <daniel@...earbox.net>,
        David Ahern <dsahern@...il.com>
Cc:     David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH RFC bpf-next 1/2] bpf_redirect_neigh: Support supplying
 the nexthop as a helper parameter

Daniel Borkmann <daniel@...earbox.net> writes:

> On 10/15/20 9:34 PM, Toke Høiland-Jørgensen wrote:
>> David Ahern <dsahern@...il.com> writes:
>>> On 10/15/20 9:46 AM, Toke Høiland-Jørgensen wrote:
>>>> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
>>>> index bf5a99d803e4..980cc1363be8 100644
>>>> --- a/include/uapi/linux/bpf.h
>>>> +++ b/include/uapi/linux/bpf.h
>>>> @@ -3677,15 +3677,19 @@ union bpf_attr {
>>>>    * 	Return
>>>>    * 		The id is returned or 0 in case the id could not be retrieved.
>>>>    *
>>>> - * long bpf_redirect_neigh(u32 ifindex, u64 flags)
>>>> + * long bpf_redirect_neigh(u32 ifindex, struct bpf_redir_neigh *params, int plen, u64 flags)
>>>
>>> why not fold ifindex into params? with params and plen this should be
>>> extensible later if needed.
>> 
>> Figured this way would make it easier to run *without* the params (like
>> in the existing examples). But don't feel strongly about it, let's see
>> what Daniel thinks.
>
> My preference is what Toke has here, this simplifies use by just being able to
> call bpf_redirect_neigh(ifindex, NULL, 0, 0) when just single external facing
> device is used.
>
>>> A couple of nits below that caught me eye.
>> 
>> Thanks, will fix; the kernel bot also found a sparse warning, so I guess
>> I need to respin anyway (but waiting for Daniel's comments and/or
>> instructions on what tree to properly submit this to).
>
> Given API change, lets do bpf. (Will review the rest later today.)

Right, ACK. I'll wait for your review, then resubmit against the bpf
tree :)

-Toke