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| author | Daniel Xu <dxu@dxuuu.xyz> | 2024-01-29 02:24:08 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2024-02-01 05:40:56 +0100 |
| commit | 6f3189f38a3e995232e028a4c341164c4aca1b20 (patch) | |
| tree | fd932c0339367596adb67fd652849506971fda3f /net/xfrm | |
| parent | bpf: btf: Add BTF_KFUNCS_START/END macro pair (diff) | |
| download | linux-6f3189f38a3e995232e028a4c341164c4aca1b20.tar.xz linux-6f3189f38a3e995232e028a4c341164c4aca1b20.zip | |
bpf: treewide: Annotate BPF kfuncs in BTF
This commit marks kfuncs as such inside the .BTF_ids section. The upshot
of these annotations is that we'll be able to automatically generate
kfunc prototypes for downstream users. The process is as follows:
1. In source, use BTF_KFUNCS_START/END macro pair to mark kfuncs
2. During build, pahole injects into BTF a "bpf_kfunc" BTF_DECL_TAG for
each function inside BTF_KFUNCS sets
3. At runtime, vmlinux or module BTF is made available in sysfs
4. At runtime, bpftool (or similar) can look at provided BTF and
generate appropriate prototypes for functions with "bpf_kfunc" tag
To ensure future kfunc are similarly tagged, we now also return error
inside kfunc registration for untagged kfuncs. For vmlinux kfuncs,
we also WARN(), as initcall machinery does not handle errors.
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Acked-by: Benjamin Tissoires <bentiss@kernel.org>
Link: https://lore.kernel.org/r/e55150ceecbf0a5d961e608941165c0bee7bc943.1706491398.git.dxu@dxuuu.xyz
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net/xfrm')
| -rw-r--r-- | net/xfrm/xfrm_interface_bpf.c | 4 | ||||
| -rw-r--r-- | net/xfrm/xfrm_state_bpf.c | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/net/xfrm/xfrm_interface_bpf.c b/net/xfrm/xfrm_interface_bpf.c index 7d5e920141e9..5ea15037ebd1 100644 --- a/net/xfrm/xfrm_interface_bpf.c +++ b/net/xfrm/xfrm_interface_bpf.c @@ -93,10 +93,10 @@ __bpf_kfunc int bpf_skb_set_xfrm_info(struct __sk_buff *skb_ctx, const struct bp __bpf_kfunc_end_defs(); -BTF_SET8_START(xfrm_ifc_kfunc_set) +BTF_KFUNCS_START(xfrm_ifc_kfunc_set) BTF_ID_FLAGS(func, bpf_skb_get_xfrm_info) BTF_ID_FLAGS(func, bpf_skb_set_xfrm_info) -BTF_SET8_END(xfrm_ifc_kfunc_set) +BTF_KFUNCS_END(xfrm_ifc_kfunc_set) static const struct btf_kfunc_id_set xfrm_interface_kfunc_set = { .owner = THIS_MODULE, diff --git a/net/xfrm/xfrm_state_bpf.c b/net/xfrm/xfrm_state_bpf.c index 9e20d4a377f7..2248eda741f8 100644 --- a/net/xfrm/xfrm_state_bpf.c +++ b/net/xfrm/xfrm_state_bpf.c @@ -117,10 +117,10 @@ __bpf_kfunc void bpf_xdp_xfrm_state_release(struct xfrm_state *x) __bpf_kfunc_end_defs(); -BTF_SET8_START(xfrm_state_kfunc_set) +BTF_KFUNCS_START(xfrm_state_kfunc_set) BTF_ID_FLAGS(func, bpf_xdp_get_xfrm_state, KF_RET_NULL | KF_ACQUIRE) BTF_ID_FLAGS(func, bpf_xdp_xfrm_state_release, KF_RELEASE) -BTF_SET8_END(xfrm_state_kfunc_set) +BTF_KFUNCS_END(xfrm_state_kfunc_set) static const struct btf_kfunc_id_set xfrm_state_xdp_kfunc_set = { .owner = THIS_MODULE, |