Daniel Xu 6f3189f38a 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>		2024-01-31 20:40:56 -08:00
..
libbpf	documentation/bpf: Document cgroup unix socket address hooks	2023-10-11 17:27:55 -07:00
standardization	docs/bpf: Improve documentation of 64-bit immediate instructions	2024-01-29 16:54:33 +01:00
bpf_design_QA.rst	docs/bpf: Add documentation for new instructions	2023-07-27 18:54:17 -07:00
bpf_devel_QA.rst	bpf: Replace deprecated -target with --target= for Clang	2023-06-29 15:46:17 +02:00
bpf_iterators.rst	bpf, docs: BPF Iterator Document	2023-06-22 19:44:22 +02:00
bpf_licensing.rst	bpf: Document BPF licensing.	2021-09-22 23:13:13 +02:00
bpf_prog_run.rst	Documentation/bpf: Add documentation for BPF_PROG_RUN	2022-03-09 14:19:22 -08:00
btf.rst	docs: automarkup: linkify git revs	2023-11-17 13:13:24 -07:00
clang-notes.rst	bpf, docs: Explain helper functions	2023-03-10 13:02:00 -08:00
classic_vs_extended.rst	bpf, docs: Split the comparism to classic BPF from instruction-set.rst	2021-12-30 16:31:44 -08:00
cpumasks.rst	bpf: Add bpf_cpumask_weight() kfunc	2023-12-09 21:37:33 -08:00
drgn.rst	bpf: Document bpf_inspect drgn tool	2020-03-26 00:08:36 +01:00
faq.rst	bpf, docs: Fix ordering of bpf documentation	2021-11-17 23:24:01 +01:00
fs_kfuncs.rst	Documentation/bpf: Add documentation for filesystem kfuncs	2023-12-01 16:21:03 -08:00
graph_ds_impl.rst	Documentation: Fix typos	2023-08-18 11:29:03 -06:00
helpers.rst	bpf, docs: Fix ordering of bpf documentation	2021-11-17 23:24:01 +01:00
index.rst	Documentation/bpf: Add documentation for filesystem kfuncs	2023-12-01 16:21:03 -08:00
kfuncs.rst	bpf: treewide: Annotate BPF kfuncs in BTF	2024-01-31 20:40:56 -08:00
linux-notes.rst	bpf, docs: Move linux-notes.rst to root bpf docs tree	2023-08-30 16:35:44 +02:00
llvm_reloc.rst	docs/bpf: Fix "file doesn't exist" warnings in {llvm_reloc,btf}.rst	2023-09-01 15:56:48 +02:00
map_array.rst	docs/bpf: Fix sphinx warnings in BPF map docs	2022-11-24 01:05:04 +01:00
map_bloom_filter.rst	docs/bpf: Document BPF_MAP_TYPE_BLOOM_FILTER	2022-11-23 22:47:32 +01:00
map_cgroup_storage.rst	Remove duplicate words inside documentation	2022-09-27 13:21:43 -06:00
map_cgrp_storage.rst	docs/bpf: Add documentation for new cgroup local storage	2022-10-25 23:19:20 -07:00
map_cpumap.rst	docs/bpf: Fix sphinx warnings for cpumap	2022-11-23 22:38:53 +01:00
map_devmap.rst	docs/bpf: Fix sphinx warnings for devmap	2022-11-23 22:40:27 +01:00
map_hash.rst	docs/bpf: Add LRU internals description and graph	2023-04-27 14:20:44 +02:00
map_lpm_trie.rst	docs/bpf: Fix sphinx warnings in BPF map docs	2022-11-24 01:05:04 +01:00
map_lru_hash_update.dot	docs/bpf: Add LRU internals description and graph	2023-04-27 14:20:44 +02:00
map_of_maps.rst	docs/bpf: Fix sphinx warnings in BPF map docs	2022-11-24 01:05:04 +01:00
map_queue_stack.rst	docs/bpf: Fix sphinx warnings in BPF map docs	2022-11-24 01:05:04 +01:00
map_sk_storage.rst	docs/bpf: Reword docs for BPF_MAP_TYPE_SK_STORAGE	2022-12-14 18:35:41 +01:00
map_sockmap.rst	sock: Remove ->sendpage*() in favour of sendmsg(MSG_SPLICE_PAGES)	2023-06-24 15:50:13 -07:00
map_xskmap.rst	Documentation: bpf: correct spelling	2023-01-28 12:22:20 -08:00
maps.rst	bpf, docs: Fix final bpf docs build failure	2023-03-02 22:36:10 -08:00
other.rst	bpf, documentation: Add graph documentation for non-owning refs	2023-02-13 19:40:53 -08:00
prog_cgroup_sockopt.rst	bpf: Document EFAULT changes for sockopt	2023-05-13 16:55:46 -07:00
prog_cgroup_sysctl.rst	bpf: Document BPF_PROG_TYPE_CGROUP_SYSCTL	2019-04-18 16:05:36 -07:00
prog_flow_dissector.rst	docs/bpf: update out-of-date doc in BPF flow dissector	2023-09-13 14:22:57 -07:00
prog_lsm.rst	lsm: move hook comments docs to security/security.c	2023-04-28 11:58:34 -04:00
prog_sk_lookup.rst	bpf: sk_lookup: Add user documentation	2020-08-24 14:46:50 -07:00
programs.rst	docs/bpf: Add table of BPF program types to libbpf docs	2022-11-23 13:31:20 -08:00
redirect.rst	bpf, docs: DEVMAPs and XDP_REDIRECT	2022-11-18 23:16:31 +01:00
ringbuf.rst	Documentation: bpf: correct spelling	2023-01-28 12:22:20 -08:00
s390.rst	bpf: Add s390 testing documentation	2019-10-30 16:25:31 +01:00
syscall_api.rst	bpf, docs: Fix ordering of bpf documentation	2021-11-17 23:24:01 +01:00
test_debug.rst	bpf, docs: Fix ordering of bpf documentation	2021-11-17 23:24:01 +01:00
verifier.rst	docs/bpf: Fix an incorrect statement in verifier.rst	2024-01-23 14:40:23 -08:00