Commit 68545fb6 authored by Jesper Dangaard Brouer's avatar Jesper Dangaard Brouer Committed by Alexei Starovoitov
Browse files

selftests/bpf: Adjust BPF selftest for xdp_adjust_tail 



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: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/158945350058.97035.17280775016196207372.stgit@firesoul
parent bc56c919

tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c

+7 −2
Original line number Diff line number Diff line
@@ -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();

}

tools/testing/selftests/bpf/progs/test_adjust_tail.c→tools/testing/selftests/bpf/progs/test_xdp_adjust_tail_shrink.c

+6 −6
Original line number Diff line number Diff line 
/* 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))