[PATCH bpf-next] bpf: Document PROG_TEST_RUN limitations

[Joe Stringer <joe@cilium.io>]

Per net/bpf/test_run.c, particular prog types have additional
restrictions around the parameters that can be provided, so document
these in the header.

I didn't bother documenting the limitation on duration for raw
tracepoints since that's an output parameter anyway.

Tested with ./tools/testing/selftests/bpf/test_doc_build.sh.

Suggested-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Joe Stringer <joe@cilium.io>
---
CC: Lorenz Bauer <lmb@cloudflare.com>
CC: Song Liu <songliubraving@fb.com>
CC: Stanislav Fomichev <sdf@google.com>
---
 include/uapi/linux/bpf.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 49371eba98ba..e1ee1be7e49b 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -312,6 +312,27 @@ union bpf_iter_link_info {
  *		*ctx_out*, *data_out* (for example, packet data), result of the
  *		execution *retval*, and *duration* of the test run.
  *
+ *		The sizes of the buffers provided as input and output
+ *		parameters *ctx_in*, *ctx_out*, *data_in*, and *data_out* must
+ *		be provided in the corresponding variables *ctx_size_in*,
+ *		*ctx_size_out*, *data_size_in*, and/or *data_size_out*. If any
+ *		of these parameters are not provided (ie set to NULL), the
+ *		corresponding size field must be zero.
+ *
+ *		Some program types have particular requirements:
+ *
+ *		**BPF_PROG_TYPE_SK_LOOKUP**
+ *			*data_in* and *data_out* must be NULL.
+ *
+ *		**BPF_PROG_TYPE_XDP**
+ *			*ctx_in* and *ctx_out* must be NULL.
+ *
+ *		**BPF_PROG_TYPE_RAW_TRACEPOINT**,
+ *		**BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE**
+ *
+ *			*ctx_out*, *data_in* and *data_out* must be NULL.
+ *			*repeat* must be zero.
+ *
  *	Return
  *		Returns zero on success. On error, -1 is returned and *errno*
  *		is set appropriately.
-- 
2.27.0