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bpf: Document BPF_PROG_TEST_RUN syscall command 

Based on a brief read of the corresponding source code.

Signed-off-by: Joe Stringer <joe@cilium.io>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210302171947.2268128-7-joe@cilium.io
This commit is contained in:
Joe Stringer 2021-03-02 09:19:38 -08:00 committed by Alexei Starovoitov
parent 32e76b187a
commit 2a3fdca4e3
1 changed files with 11 additions and 3 deletions
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14
include/uapi/linux/bpf.h
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@ -306,14 +306,22 @@ 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.