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Diffstat (limited to 'Documentation/bpf/kfuncs.rst')
| -rw-r--r-- | Documentation/bpf/kfuncs.rst | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/bpf/kfuncs.rst b/Documentation/bpf/kfuncs.rst index a8f5782bd833..ae468b781d31 100644 --- a/Documentation/bpf/kfuncs.rst +++ b/Documentation/bpf/kfuncs.rst @@ -160,6 +160,23 @@ Or:: ... } +2.2.6 __prog Annotation +--------------------------- +This annotation is used to indicate that the argument needs to be fixed up to +the bpf_prog_aux of the caller BPF program. Any value passed into this argument +is ignored, and rewritten by the verifier. + +An example is given below:: + + __bpf_kfunc int bpf_wq_set_callback_impl(struct bpf_wq *wq, + int (callback_fn)(void *map, int *key, void *value), + unsigned int flags, + void *aux__prog) + { + struct bpf_prog_aux *aux = aux__prog; + ... + } + .. _BPF_kfunc_nodef: 2.3 Using an existing kernel function |