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selftests/bpf: Adjust BPF selftest for xdp_adjust_tail

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Current selftest for BPF-helper xdp_adjust_tail only shrink tail.
Make it more clear that this is a shrink test case.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/158945350058.97035.17280775016196207372.stgit@firesoul
This commit is contained in:
Jesper Dangaard Brouer 2020-05-14 12:51:40 +02:00 committed by Alexei Starovoitov
parent bc56c919fc
commit 68545fb6f2
2 changed files with 13 additions and 8 deletions
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9
tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c
View File

@ -2,9 +2,9 @@
#include <test_progs.h>
#include <network_helpers.h>
void test_xdp_adjust_tail(void)
void test_xdp_adjust_tail_shrink(void)
{
const char *file = "./test_adjust_tail.o";
const char *file = "./test_xdp_adjust_tail_shrink.o";
struct bpf_object *obj;
char buf[128];
__u32 duration, retval, size;
@ -28,3 +28,8 @@ void test_xdp_adjust_tail(void)
err, errno, retval, size);
bpf_object__close(obj);
}
void test_xdp_adjust_tail(void)
{
test_xdp_adjust_tail_shrink();
}

12
tools/testing/selftests/bpf/progs/test_adjust_tail.c → tools/testing/selftests/bpf/progs/test_xdp_adjust_tail_shrink.c
View File

@ -1,5 +1,5 @@
/* SPDX-License-Identifier: GPL-2.0
* Copyright (c) 2018 Facebook
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018 Facebook
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
@ -11,15 +11,15 @@
int _version SEC("version") = 1;
SEC("xdp_adjust_tail")
int _xdp_adjust_tail(struct xdp_md *xdp)
SEC("xdp_adjust_tail_shrink")
int _xdp_adjust_tail_shrink(struct xdp_md *xdp)
{
void *data_end = (void *)(long)xdp->data_end;
void *data = (void *)(long)xdp->data;
int offset = 0;
if (data_end - data == 54)
offset = 256;
if (data_end - data == 54) /* sizeof(pkt_v4) */
offset = 256; /* shrink too much */
else
offset = 20;
if (bpf_xdp_adjust_tail(xdp, 0 - offset))