netdev - Re: [RFC bpf-next 6/8] libbpf: add API to get XDP/XSK supported features

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Date:   Tue, 20 Dec 2022 16:18:10 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, davem@...emloft.net,
        kuba@...nel.org, hawk@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, toke@...hat.com, memxor@...il.com,
        alardam@...il.com, saeedm@...dia.com, anthony.l.nguyen@...el.com,
        gospo@...adcom.com, vladimir.oltean@....com, nbd@....name,
        john@...ozen.org, leon@...nel.org, simon.horman@...igine.com,
        aelior@...vell.com, christophe.jaillet@...adoo.fr,
        ecree.xilinx@...il.com, grygorii.strashko@...com, mst@...hat.com,
        bjorn@...nel.org, magnus.karlsson@...el.com,
        maciej.fijalkowski@...el.com, intel-wired-lan@...ts.osuosl.org,
        lorenzo.bianconi@...hat.com
Subject: Re: [RFC bpf-next 6/8] libbpf: add API to get XDP/XSK supported features

On Mon, Dec 19, 2022 at 7:42 AM Lorenzo Bianconi <lorenzo@...nel.org> wrote:
>
> From: Kumar Kartikeya Dwivedi <memxor@...il.com>
>
> Add functions to get XDP/XSK supported function of netdev over route
> netlink interface. These functions provide functionalities that are
> going to be used in upcoming change.
>
> The newly added bpf_xdp_query_features takes a fflags_cnt parameter,
> which denotes the number of elements in the output fflags array. This
> must be at least 1 and maybe greater than XDP_FEATURES_WORDS. The
> function only writes to words which is min of fflags_cnt and
> XDP_FEATURES_WORDS.
>
> Co-developed-by: Lorenzo Bianconi <lorenzo@...nel.org>
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> Co-developed-by: Marek Majtyka <alardam@...il.com>
> Signed-off-by: Marek Majtyka <alardam@...il.com>
> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
> ---
>  tools/lib/bpf/libbpf.h   |  1 +
>  tools/lib/bpf/libbpf.map |  1 +
>  tools/lib/bpf/netlink.c  | 62 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 64 insertions(+)
>
> diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> index eee883f007f9..9d102eb5007e 100644
> --- a/tools/lib/bpf/libbpf.h
> +++ b/tools/lib/bpf/libbpf.h
> @@ -967,6 +967,7 @@ LIBBPF_API int bpf_xdp_detach(int ifindex, __u32 flags,
>                               const struct bpf_xdp_attach_opts *opts);
>  LIBBPF_API int bpf_xdp_query(int ifindex, int flags, struct bpf_xdp_query_opts *opts);
>  LIBBPF_API int bpf_xdp_query_id(int ifindex, int flags, __u32 *prog_id);
> +LIBBPF_API int bpf_xdp_query_features(int ifindex, __u32 *fflags, __u32 *fflags_cnt);

no need to add new API, just extend bpf_xdp_query()?

>
>  /* TC related API */
>  enum bpf_tc_attach_point {
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index 71bf5691a689..9c2abb58fa4b 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -362,6 +362,7 @@ LIBBPF_1.0.0 {
>                 bpf_program__set_autoattach;
>                 btf__add_enum64;
>                 btf__add_enum64_value;
> +               bpf_xdp_query_features;
>                 libbpf_bpf_attach_type_str;
>                 libbpf_bpf_link_type_str;
>                 libbpf_bpf_map_type_str;

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