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e69fe84595
Currently, many programs under sample/bpf often include individual macros by directly including the header under "linux/" rather than using the "vmlinux.h" header. However, there are some problems with migrating to "vmlinux.h" because there is no definition for utility functions such as endianness conversion (ntohs/htons). Fortunately, the xdp_sample program already has a function that can be replaced to solve this problem. Therefore, this commit attempts to separate these functions into a file called net_shared.h to make them universally available. Additionally, this file includes network-related macros that are not defined in "vmlinux.h". (inspired by 'selftests' bpf_tracing_net.h) Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Link: https://lore.kernel.org/r/20230115071613.125791-8-danieltimlee@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef _XDP_SAMPLE_BPF_H
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#define _XDP_SAMPLE_BPF_H
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#include "vmlinux.h"
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#include <bpf/bpf_tracing.h>
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#include <bpf/bpf_core_read.h>
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#include <bpf/bpf_helpers.h>
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#include "net_shared.h"
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#include "xdp_sample_shared.h"
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#define EINVAL 22
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#define ENETDOWN 100
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#define EMSGSIZE 90
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#define EOPNOTSUPP 95
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#define ENOSPC 28
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typedef struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(map_flags, BPF_F_MMAPABLE);
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__type(key, unsigned int);
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__type(value, struct datarec);
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} array_map;
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extern array_map rx_cnt;
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extern const volatile int nr_cpus;
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enum {
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XDP_REDIRECT_SUCCESS = 0,
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XDP_REDIRECT_ERROR = 1
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};
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static __always_inline void swap_src_dst_mac(void *data)
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{
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unsigned short *p = data;
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unsigned short dst[3];
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dst[0] = p[0];
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dst[1] = p[1];
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dst[2] = p[2];
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p[0] = p[3];
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p[1] = p[4];
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p[2] = p[5];
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p[3] = dst[0];
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p[4] = dst[1];
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p[5] = dst[2];
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}
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/*
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* Note: including linux/compiler.h or linux/kernel.h for the macros below
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* conflicts with vmlinux.h include in BPF files, so we define them here.
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*
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* Following functions are taken from kernel sources and
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* break aliasing rules in their original form.
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*
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* While kernel is compiled with -fno-strict-aliasing,
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* perf uses -Wstrict-aliasing=3 which makes build fail
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* under gcc 4.4.
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*
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* Using extra __may_alias__ type to allow aliasing
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* in this case.
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*/
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typedef __u8 __attribute__((__may_alias__)) __u8_alias_t;
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typedef __u16 __attribute__((__may_alias__)) __u16_alias_t;
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typedef __u32 __attribute__((__may_alias__)) __u32_alias_t;
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typedef __u64 __attribute__((__may_alias__)) __u64_alias_t;
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static __always_inline void __read_once_size(const volatile void *p, void *res, int size)
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{
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switch (size) {
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case 1: *(__u8_alias_t *) res = *(volatile __u8_alias_t *) p; break;
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case 2: *(__u16_alias_t *) res = *(volatile __u16_alias_t *) p; break;
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case 4: *(__u32_alias_t *) res = *(volatile __u32_alias_t *) p; break;
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case 8: *(__u64_alias_t *) res = *(volatile __u64_alias_t *) p; break;
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default:
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asm volatile ("" : : : "memory");
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__builtin_memcpy((void *)res, (const void *)p, size);
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asm volatile ("" : : : "memory");
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}
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}
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static __always_inline void __write_once_size(volatile void *p, void *res, int size)
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{
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switch (size) {
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case 1: *(volatile __u8_alias_t *) p = *(__u8_alias_t *) res; break;
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case 2: *(volatile __u16_alias_t *) p = *(__u16_alias_t *) res; break;
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case 4: *(volatile __u32_alias_t *) p = *(__u32_alias_t *) res; break;
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case 8: *(volatile __u64_alias_t *) p = *(__u64_alias_t *) res; break;
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default:
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asm volatile ("" : : : "memory");
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__builtin_memcpy((void *)p, (const void *)res, size);
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asm volatile ("" : : : "memory");
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}
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}
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#define READ_ONCE(x) \
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({ \
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union { typeof(x) __val; char __c[1]; } __u = \
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{ .__c = { 0 } }; \
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__read_once_size(&(x), __u.__c, sizeof(x)); \
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__u.__val; \
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})
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#define WRITE_ONCE(x, val) \
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({ \
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union { typeof(x) __val; char __c[1]; } __u = \
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{ .__val = (val) }; \
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__write_once_size(&(x), __u.__c, sizeof(x)); \
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__u.__val; \
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})
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/* Add a value using relaxed read and relaxed write. Less expensive than
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* fetch_add when there is no write concurrency.
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*/
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#define NO_TEAR_ADD(x, val) WRITE_ONCE((x), READ_ONCE(x) + (val))
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#define NO_TEAR_INC(x) NO_TEAR_ADD((x), 1)
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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#endif
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