netdev - Re: [PATCH iproute2 -next 2/2] tc: add eBPF support to f

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Date:	Mon, 16 Mar 2015 10:45:35 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Daniel Borkmann <daniel@...earbox.net>, stephen@...workplumber.org
CC:	jhs@...atatu.com, jiri@...nulli.us, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 -next 2/2] tc: add eBPF support to f_bpf

On 3/16/15 10:10 AM, Daniel Borkmann wrote:

> +
> +/* ELF section names, etc (ABI) */
> +#define ELF_SECTION_LICENSE	"license"
> +#define ELF_SECTION_MAPS	"maps"
> +#define ELF_SECTION_CLASSIFIER	"classifier"
> +#define ELF_SECTION_ACTION	"action"
> +
> +#define ELF_MAX_MAPS		64
> +#define ELF_MAX_LICENSE_LEN	128
> +
> +/* ELF map definition (ABI) */
> +struct bpf_elf_map {
> +	__u32 type;
> +	__u32 size_key;
> +	__u32 size_value;
> +	__u32 max_elem;
> +};

I think people might freak out that the above section names and
the struct are a kernel ABI. It's obviously not.
Would be good to say that this is a present convention between
C program that describes tc classifier and tc elf reader
and it can change in the future.

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