netdev - Re: [PATCH v22 bpf-next 18/23] libbpf: Add SEC name for xdp multi-frags programs

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Message-ID: <20220118201449.sjqzif5qkpbu5tqx@ast-mbp.dhcp.thefacebook.com>
Date:   Tue, 18 Jan 2022 12:14:49 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        lorenzo.bianconi@...hat.com, davem@...emloft.net, kuba@...nel.org,
        ast@...nel.org, daniel@...earbox.net, shayagr@...zon.com,
        john.fastabend@...il.com, dsahern@...nel.org, brouer@...hat.com,
        echaudro@...hat.com, jasowang@...hat.com,
        alexander.duyck@...il.com, saeed@...nel.org,
        maciej.fijalkowski@...el.com, magnus.karlsson@...el.com,
        tirthendu.sarkar@...el.com, toke@...hat.com
Subject: Re: [PATCH v22 bpf-next 18/23] libbpf: Add SEC name for xdp
 multi-frags programs

On Mon, Jan 17, 2022 at 06:28:30PM +0100, Lorenzo Bianconi wrote:
> Introduce support for the following SEC entries for XDP multi-frags
> property:
> - SEC("xdp.frags")
> - SEC("xdp.frags/devmap")
> - SEC("xdp.frags/cpumap")
> 
> Acked-by: Toke Hoiland-Jorgensen <toke@...hat.com>
> Acked-by: John Fastabend <john.fastabend@...il.com>
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  tools/lib/bpf/libbpf.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index fdb3536afa7d..611e81357fb6 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -6562,6 +6562,9 @@ static int libbpf_preload_prog(struct bpf_program *prog,
>  	if (def & SEC_SLEEPABLE)
>  		opts->prog_flags |= BPF_F_SLEEPABLE;
>  
> +	if (prog->type == BPF_PROG_TYPE_XDP && strstr(prog->sec_name, ".frags"))
> +		opts->prog_flags |= BPF_F_XDP_HAS_FRAGS;

That's a bit sloppy.
Could you handle it similar to SEC_SLEEPABLE?

> +
>  	if ((prog->type == BPF_PROG_TYPE_TRACING ||
>  	     prog->type == BPF_PROG_TYPE_LSM ||
>  	     prog->type == BPF_PROG_TYPE_EXT) && !prog->attach_btf_id) {
> @@ -8600,8 +8603,11 @@ static const struct bpf_sec_def section_defs[] = {
>  	SEC_DEF("lsm.s/",		LSM, BPF_LSM_MAC, SEC_ATTACH_BTF | SEC_SLEEPABLE, attach_lsm),
>  	SEC_DEF("iter/",		TRACING, BPF_TRACE_ITER, SEC_ATTACH_BTF, attach_iter),
>  	SEC_DEF("syscall",		SYSCALL, 0, SEC_SLEEPABLE),
> +	SEC_DEF("xdp.frags/devmap",	XDP, BPF_XDP_DEVMAP, SEC_NONE),
>  	SEC_DEF("xdp_devmap/",		XDP, BPF_XDP_DEVMAP, SEC_ATTACHABLE),
> +	SEC_DEF("xdp.frags/cpumap",	XDP, BPF_XDP_CPUMAP, SEC_NONE),
>  	SEC_DEF("xdp_cpumap/",		XDP, BPF_XDP_CPUMAP, SEC_ATTACHABLE),
> +	SEC_DEF("xdp.frags",		XDP, BPF_XDP, SEC_NONE),

It would be SEC_FRAGS here instead of SEC_NONE.

>  	SEC_DEF("xdp",			XDP, BPF_XDP, SEC_ATTACHABLE_OPT | SEC_SLOPPY_PFX),
>  	SEC_DEF("perf_event",		PERF_EVENT, 0, SEC_NONE | SEC_SLOPPY_PFX),
>  	SEC_DEF("lwt_in",		LWT_IN, 0, SEC_NONE | SEC_SLOPPY_PFX),
> -- 
> 2.34.1
> 

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