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selftests/bpf: Fix bind program for big endian systems

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Without this fix, the bind4 and bind6 programs will reject bind attempts
on big endian systems. This patch ensures that CI tests pass for the
s390x architecture.

Signed-off-by: Jordan Rife <jrife@google.com>
Link: https://lore.kernel.org/r/20240429214529.2644801-2-jrife@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Jordan Rife
2024-04-29 16:45:18 -05:00
committed by Martin KaFai Lau
parent 08e90da687
commit 8e667a065d
3 changed files with 39 additions and 16 deletions
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19
tools/testing/selftests/bpf/progs/bind_prog.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __BIND_PROG_H__
#define __BIND_PROG_H__
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define load_byte(src, b, s) \
(((volatile __u8 *)&(src))[b] << 8 * b)
#define load_word(src, w, s) \
(((volatile __u16 *)&(src))[w] << 16 * w)
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define load_byte(src, b, s) \
(((volatile __u8 *)&(src))[(b) + (sizeof(src) - (s))] << 8 * ((s) - (b) - 1))
#define load_word(src, w, s) \
(((volatile __u16 *)&(src))[w] << 16 * (((s) / 2) - (w) - 1))
#else
# error "Fix your compiler's __BYTE_ORDER__?!"
#endif
#endif