netdev - Re: [PATCH bpf-next 5/6] libbpf: Add bpf_get_link_xdp_info() function to get more XDP information

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Message-ID: <3C1D7121-8D90-4F30-964D-D684CAC3FFEA@fb.com>
Date:   Fri, 8 Nov 2019 19:52:35 +0000
From:   Song Liu <songliubraving@...com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
CC:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>, Martin Lau <kafai@...com>,
        Yonghong Song <yhs@...com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next 5/6] libbpf: Add bpf_get_link_xdp_info() function
 to get more XDP information



> On Nov 7, 2019, at 8:52 AM, Toke Høiland-Jørgensen <toke@...hat.com> wrote:
> 
> From: Toke Høiland-Jørgensen <toke@...hat.com>
> 
> Currently, libbpf only provides a function to get a single ID for the XDP
> program attached to the interface. However, it can be useful to get the
> full set of program IDs attached, along with the attachment mode, in one
> go. Add a new getter function to support this, using an extendible
> structure to carry the information. Express the old bpf_get_link_id()
> function in terms of the new function.
> 
> Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
> ---
> tools/lib/bpf/libbpf.h   |   10 ++++++
> tools/lib/bpf/libbpf.map |    1 +
> tools/lib/bpf/netlink.c  |   78 ++++++++++++++++++++++++++++++----------------
> 3 files changed, 62 insertions(+), 27 deletions(-)
> 
> diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> index 6ddc0419337b..f0947cc949d2 100644
> --- a/tools/lib/bpf/libbpf.h
> +++ b/tools/lib/bpf/libbpf.h
> @@ -427,8 +427,18 @@ LIBBPF_API int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
> LIBBPF_API int bpf_prog_load(const char *file, enum bpf_prog_type type,
> 			     struct bpf_object **pobj, int *prog_fd);
> 
> +struct xdp_link_info {
> +	__u32 prog_id;
> +	__u32 drv_prog_id;
> +	__u32 hw_prog_id;
> +	__u32 skb_prog_id;
> +	__u8 attach_mode;
> +};
> +
> LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
> LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags);
> +LIBBPF_API int bpf_get_link_xdp_info(int ifindex, struct xdp_link_info *info,
> +				     size_t info_size, __u32 flags);
> 
> struct perf_buffer;
> 
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index 86173cbb159d..45f229af2766 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -202,4 +202,5 @@ LIBBPF_0.0.6 {
> 		bpf_program__get_type;
> 		bpf_program__is_tracing;
> 		bpf_program__set_tracing;
> +		bpf_get_link_xdp_info;

Please keep these entries in alphabetic order. 

Just found I added most out-of-order entries. :(

Other than this

Acked-by: Song Liu <songliubraving@...com>