> On Mon, Dec 19, 2022 at 7:42 AM Lorenzo Bianconi <lorenzo@xxxxxxxxxx> wrote:
> >
> > From: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>
> >
> > 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@xxxxxxxxxx>
> > Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
> > Co-developed-by: Marek Majtyka <alardam@xxxxxxxxx>
> > Signed-off-by: Marek Majtyka <alardam@xxxxxxxxx>
> > Signed-off-by: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>
> > ---
> > 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()?
Hi Andrii,
AFAIK libbpf supports just NETLINK_ROUTE protocol. In order to connect with the
genl family code shared by Jakub we need to add NETLINK_GENERIC protocol support
to libbf. Is it ok to introduce a libmnl or libnl dependency in libbpf or do you
prefer to add open code to just what we need?
I guess we should have a dedicated API to dump xdp features in this case since
all the other code relies on NETLINK_ROUTE protocol. What do you think?
Regards,
Lorenzo
>
> >
> > /* 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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