netdev - RE: [PATCH v19 bpf-next 18/23] libbpf: Add SEC name for xdp

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Date:   Mon, 06 Dec 2021 09:47:20 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>, bpf@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     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 v19 bpf-next 18/23] libbpf: Add SEC name for xdp_mb
 programs

Lorenzo Bianconi wrote:
> Introduce support for the following SEC entries for XDP multi-buff
> property:
> - SEC("xdp_mb/")
> - SEC("xdp_devmap_mb/")
> - SEC("xdp_cpumap_mb/")
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  tools/lib/bpf/libbpf.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index b59fede08ba7..ddad9eb2826a 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -265,6 +265,8 @@ enum sec_def_flags {
>  	SEC_SLEEPABLE = 8,
>  	/* allow non-strict prefix matching */
>  	SEC_SLOPPY_PFX = 16,
> +	/* BPF program support XDP multi-buff */
> +	SEC_XDP_MB = 32,
>  };
>  
>  struct bpf_sec_def {
> @@ -6505,6 +6507,9 @@ 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 && (def & SEC_XDP_MB))
> +		opts->prog_flags |= BPF_F_XDP_MB;
> +
>  	if ((prog->type == BPF_PROG_TYPE_TRACING ||
>  	     prog->type == BPF_PROG_TYPE_LSM ||
>  	     prog->type == BPF_PROG_TYPE_EXT) && !prog->attach_btf_id) {
> @@ -8468,8 +8473,11 @@ 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_devmap_mb/",	XDP, BPF_XDP_DEVMAP, SEC_ATTACHABLE | SEC_XDP_MB),
>  	SEC_DEF("xdp_devmap/",		XDP, BPF_XDP_DEVMAP, SEC_ATTACHABLE),
> +	SEC_DEF("xdp_cpumap_mb/",	XDP, BPF_XDP_CPUMAP, SEC_ATTACHABLE | SEC_XDP_MB),
>  	SEC_DEF("xdp_cpumap/",		XDP, BPF_XDP_CPUMAP, SEC_ATTACHABLE),
> +	SEC_DEF("xdp_mb/",		XDP, BPF_XDP, SEC_ATTACHABLE_OPT | SEC_SLOPPY_PFX | SEC_XDP_MB),
>  	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),
> -- 
> 2.31.1
> 

LGTM. Nice to see this got to a good solution.

Acked-by: John Fastabend <john.fastabend@...il.com>