netdev - [PATCH bpf-next 06/17] bpf: Document BPF_PROG_TEST

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Message-Id: <20210217010821.1810741-7-joe@wand.net.nz>
Date:   Tue, 16 Feb 2021 17:08:10 -0800
From:   Joe Stringer <joe@...d.net.nz>
To:     bpf@...r.kernel.org
Cc:     Joe Stringer <joe@...ium.io>, netdev@...r.kernel.org,
        daniel@...earbox.net, ast@...nel.org, mtk.manpages@...il.com,
        Quentin Monnet <quentin@...valent.com>
Subject: [PATCH bpf-next 06/17] bpf: Document BPF_PROG_TEST_RUN syscall command

From: Joe Stringer <joe@...ium.io>

Based on a brief read of the corresponding source code.

Reviewed-by: Quentin Monnet <quentin@...valent.com>
Signed-off-by: Joe Stringer <joe@...ium.io>
---
 include/uapi/linux/bpf.h | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 603605c5ca03..86fe0445c395 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -303,14 +303,22 @@ union bpf_iter_link_info {
  *
  * BPF_PROG_TEST_RUN
  *	Description
- *		Run an eBPF program a number of times against a provided
- *		program context and return the modified program context and
- *		duration of the test run.
+ *		Run the eBPF program associated with the *prog_fd* a *repeat*
+ *		number of times against a provided program context *ctx_in* and
+ *		data *data_in*, and return the modified program context
+ *		*ctx_out*, *data_out* (for example, packet data), result of the
+ *		execution *retval*, and *duration* of the test run.
  *
  *	Return
  *		Returns zero on success. On error, -1 is returned and *errno*
  *		is set appropriately.
  *
+ *		**ENOSPC**
+ *			Either *data_size_out* or *ctx_size_out* is too small.
+ *		**ENOTSUPP**
+ *			This command is not supported by the program type of
+ *			the program referred to by *prog_fd*.
+ *
  * BPF_PROG_GET_NEXT_ID
  *	Description
  *		Fetch the next eBPF program currently loaded into the kernel.
-- 
2.27.0