xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

bpf: Add support for BPF_OBJ_GET_INFO_BY_FD for bpf_link

Browse Source 
Add ability to fetch bpf_link details through BPF_OBJ_GET_INFO_BY_FD command.
Also enhance show_fdinfo to potentially include bpf_link type-specific
information (similarly to obj_info).

Also introduce enum bpf_link_type stored in bpf_link itself and expose it in
UAPI. bpf_link_tracing also now will store and return bpf_attach_type.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200429001614.1544-5-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2020-04-28 17:16:08 -07:00
committed by Alexei Starovoitov
parent 2d602c8cf4
commit f2e10bff16
9 changed files with 253 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
kernel/bpf/cgroup.c
View File

@@ -833,10 +833,48 @@ static void bpf_cgroup_link_dealloc(struct bpf_link *link)
kfree(cg_link);
}
const struct bpf_link_ops bpf_cgroup_link_lops = {
static void bpf_cgroup_link_show_fdinfo(const struct bpf_link *link,
struct seq_file *seq)
{
struct bpf_cgroup_link *cg_link =
container_of(link, struct bpf_cgroup_link, link);
u64 cg_id = 0;
mutex_lock(&cgroup_mutex);
if (cg_link->cgroup)
cg_id = cgroup_id(cg_link->cgroup);
mutex_unlock(&cgroup_mutex);
seq_printf(seq,
"cgroup_id:\t%llu\n"
"attach_type:\t%d\n",
cg_id,
cg_link->type);
}
static int bpf_cgroup_link_fill_link_info(const struct bpf_link *link,
struct bpf_link_info *info)
{
struct bpf_cgroup_link *cg_link =
container_of(link, struct bpf_cgroup_link, link);
u64 cg_id = 0;
mutex_lock(&cgroup_mutex);
if (cg_link->cgroup)
cg_id = cgroup_id(cg_link->cgroup);
mutex_unlock(&cgroup_mutex);
info->cgroup.cgroup_id = cg_id;
info->cgroup.attach_type = cg_link->type;
return 0;
}
static const struct bpf_link_ops bpf_cgroup_link_lops = {
.release = bpf_cgroup_link_release,
.dealloc = bpf_cgroup_link_dealloc,
.update_prog = cgroup_bpf_replace,
.show_fdinfo = bpf_cgroup_link_show_fdinfo,
.fill_link_info = bpf_cgroup_link_fill_link_info,
};
int cgroup_bpf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
@@ -858,7 +896,8 @@ int cgroup_bpf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
err = -ENOMEM;
goto out_put_cgroup;
}
bpf_link_init(&link->link, &bpf_cgroup_link_lops, prog);
bpf_link_init(&link->link, BPF_LINK_TYPE_CGROUP, &bpf_cgroup_link_lops,
prog);
link->cgroup = cgrp;
link->type = attr->link_create.attach_type;