Commit c1931c97 authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Alexei Starovoitov

bpf: Implement BPF XDP link-specific introspection APIs

Implement XDP link-specific show_fdinfo and link_info to emit ifindex.
Signed-off-by: default avatarAndrii Nakryiko <andriin@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200722064603.3350758-7-andriin@fb.com
parent 026a4c28
......@@ -4069,6 +4069,9 @@ struct bpf_link_info {
__u32 netns_ino;
__u32 attach_type;
} netns;
struct {
__u32 ifindex;
} xdp;
};
} __attribute__((aligned(8)));
......
......@@ -8996,6 +8996,35 @@ static void bpf_xdp_link_dealloc(struct bpf_link *link)
kfree(xdp_link);
}
static void bpf_xdp_link_show_fdinfo(const struct bpf_link *link,
struct seq_file *seq)
{
struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
u32 ifindex = 0;
rtnl_lock();
if (xdp_link->dev)
ifindex = xdp_link->dev->ifindex;
rtnl_unlock();
seq_printf(seq, "ifindex:\t%u\n", ifindex);
}
static int bpf_xdp_link_fill_link_info(const struct bpf_link *link,
struct bpf_link_info *info)
{
struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
u32 ifindex = 0;
rtnl_lock();
if (xdp_link->dev)
ifindex = xdp_link->dev->ifindex;
rtnl_unlock();
info->xdp.ifindex = ifindex;
return 0;
}
static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog,
struct bpf_prog *old_prog)
{
......@@ -9041,6 +9070,8 @@ static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog,
static const struct bpf_link_ops bpf_xdp_link_lops = {
.release = bpf_xdp_link_release,
.dealloc = bpf_xdp_link_dealloc,
.show_fdinfo = bpf_xdp_link_show_fdinfo,
.fill_link_info = bpf_xdp_link_fill_link_info,
.update_prog = bpf_xdp_link_update,
};
......
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