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| author | Hou Tao <houtao1@huawei.com> | 2021-10-25 09:40:24 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-11-02 00:10:00 +0300 |
| commit | c196906d50e360d82ed9aa5596a9d0ce89b7ab78 (patch) | |
| tree | af835ec8e400eed208337390b5c5d1ef2681b955 /net/bpf/Makefile | |
| parent | 35346ab64132d0f5919b06932d708c0d10360553 (diff) | |
| download | linux-c196906d50e360d82ed9aa5596a9d0ce89b7ab78.tar.xz | |
bpf: Add dummy BPF STRUCT_OPS for test purpose
Currently the test of BPF STRUCT_OPS depends on the specific bpf
implementation of tcp_congestion_ops, but it can not cover all
basic functionalities (e.g, return value handling), so introduce
a dummy BPF STRUCT_OPS for test purpose.
Loading a bpf_dummy_ops implementation from userspace is prohibited,
and its only purpose is to run BPF_PROG_TYPE_STRUCT_OPS program
through bpf(BPF_PROG_TEST_RUN). Now programs for test_1() & test_2()
are supported. The following three cases are exercised in
bpf_dummy_struct_ops_test_run():
(1) test and check the value returned from state arg in test_1(state)
The content of state is copied from userspace pointer and copied back
after calling test_1(state). The user pointer is saved in an u64 array
and the array address is passed through ctx_in.
(2) test and check the return value of test_1(NULL)
Just simulate the case in which an invalid input argument is passed in.
(3) test multiple arguments passing in test_2(state, ...)
5 arguments are passed through ctx_in in form of u64 array. The first
element of array is userspace pointer of state and others 4 arguments
follow.
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20211025064025.2567443-4-houtao1@huawei.com
Diffstat (limited to 'net/bpf/Makefile')
| -rw-r--r-- | net/bpf/Makefile | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/bpf/Makefile b/net/bpf/Makefile index 1c0a98d8c28f..1ebe270bde23 100644 --- a/net/bpf/Makefile +++ b/net/bpf/Makefile @@ -1,2 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_BPF_SYSCALL) := test_run.o +ifeq ($(CONFIG_BPF_JIT),y) +obj-$(CONFIG_BPF_SYSCALL) += bpf_dummy_struct_ops.o +endif |