netdev - Re: [bpf-next v2 8/9] bpf: Provide helper to do forwarding lookups in kernel FIB table

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Date:   Mon, 7 May 2018 15:35:52 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org, borkmann@...earbox.net, ast@...nel.org,
        davem@...emloft.net, shm@...ulusnetworks.com,
        roopa@...ulusnetworks.com, toke@...e.dk, john.fastabend@...il.com,
        brouer@...hat.com
Subject: Re: [bpf-next v2 8/9] bpf: Provide helper to do forwarding lookups
 in kernel FIB table


On Thu,  3 May 2018 19:54:31 -0700 David Ahern <dsahern@...il.com> wrote:

> diff --git a/net/core/filter.c b/net/core/filter.c
> index 6877426c23a6..cf0d27acf1d1 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
[...]
> +static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = {
> +	.func		= bpf_xdp_fib_lookup,
> +	.gpl_only	= true,

Is it a deliberate choice to require BPF-progs using this helper to be
GPL licensed?

Asking as this seems to be the first network related helper with this
requirement, while this is typical for tracing related helpers.


> +	.ret_type	= RET_INTEGER,
> +	.arg1_type      = ARG_PTR_TO_CTX,
> +	.arg2_type      = ARG_PTR_TO_MEM,
> +	.arg3_type      = ARG_CONST_SIZE,
> +	.arg4_type	= ARG_ANYTHING,
> +};

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer