1 // SPDX-License-Identifier: GPL-2.0
2 #ifndef _XDP_SAMPLE_BPF_H
3 #define _XDP_SAMPLE_BPF_H
4
5 #include "vmlinux.h"
6 #include <bpf/bpf_tracing.h>
7 #include <bpf/bpf_core_read.h>
8 #include <bpf/bpf_helpers.h>
9
10 #include "net_shared.h"
11 #include "xdp_sample_shared.h"
12
13 #define EINVAL 22
14 #define ENETDOWN 100
15 #define EMSGSIZE 90
16 #define EOPNOTSUPP 95
17 #define ENOSPC 28
18
19 typedef struct {
20 __uint(type, BPF_MAP_TYPE_ARRAY);
21 __uint(map_flags, BPF_F_MMAPABLE);
22 __type(key, unsigned int);
23 __type(value, struct datarec);
24 } array_map;
25
26 extern array_map rx_cnt;
27 extern const volatile int nr_cpus;
28
29 enum {
30 XDP_REDIRECT_SUCCESS = 0,
31 XDP_REDIRECT_ERROR = 1
32 };
33
34 static __always_inline void swap_src_dst_mac(void *data)
35 {
36 unsigned short *p = data;
37 unsigned short dst[3];
38
39 dst[0] = p[0];
40 dst[1] = p[1];
41 dst[2] = p[2];
42 p[0] = p[3];
43 p[1] = p[4];
44 p[2] = p[5];
45 p[3] = dst[0];
46 p[4] = dst[1];
47 p[5] = dst[2];
48 }
49
50 /*
51 * Note: including linux/compiler.h or linux/kernel.h for the macros below
52 * conflicts with vmlinux.h include in BPF files, so we define them here.
53 *
54 * Following functions are taken from kernel sources and
55 * break aliasing rules in their original form.
56 *
57 * While kernel is compiled with -fno-strict-aliasing,
58 * perf uses -Wstrict-aliasing=3 which makes build fail
59 * under gcc 4.4.
60 *
61 * Using extra __may_alias__ type to allow aliasing
62 * in this case.
63 */
64 typedef __u8 __attribute__((__may_alias__)) __u8_alias_t;
65 typedef __u16 __attribute__((__may_alias__)) __u16_alias_t;
66 typedef __u32 __attribute__((__may_alias__)) __u32_alias_t;
67 typedef __u64 __attribute__((__may_alias__)) __u64_alias_t;
68
69 static __always_inline void __read_once_size(const volatile void *p, void *res, int size)
70 {
71 switch (size) {
72 case 1: *(__u8_alias_t *) res = *(volatile __u8_alias_t *) p; break;
73 case 2: *(__u16_alias_t *) res = *(volatile __u16_alias_t *) p; break;
74 case 4: *(__u32_alias_t *) res = *(volatile __u32_alias_t *) p; break;
75 case 8: *(__u64_alias_t *) res = *(volatile __u64_alias_t *) p; break;
76 default:
77 asm volatile ("" : : : "memory");
78 __builtin_memcpy((void *)res, (const void *)p, size);
79 asm volatile ("" : : : "memory");
80 }
81 }
82
83 static __always_inline void __write_once_size(volatile void *p, void *res, int size)
84 {
85 switch (size) {
86 case 1: *(volatile __u8_alias_t *) p = *(__u8_alias_t *) res; break;
87 case 2: *(volatile __u16_alias_t *) p = *(__u16_alias_t *) res; break;
88 case 4: *(volatile __u32_alias_t *) p = *(__u32_alias_t *) res; break;
89 case 8: *(volatile __u64_alias_t *) p = *(__u64_alias_t *) res; break;
90 default:
91 asm volatile ("" : : : "memory");
92 __builtin_memcpy((void *)p, (const void *)res, size);
93 asm volatile ("" : : : "memory");
94 }
95 }
96
97 #define READ_ONCE(x) \
98 ({ \
99 union { typeof(x) __val; char __c[1]; } __u = \
100 { .__c = { 0 } }; \
101 __read_once_size(&(x), __u.__c, sizeof(x)); \
102 __u.__val; \
103 })
104
105 #define WRITE_ONCE(x, val) \
106 ({ \
107 union { typeof(x) __val; char __c[1]; } __u = \
108 { .__val = (val) }; \
109 __write_once_size(&(x), __u.__c, sizeof(x)); \
110 __u.__val; \
111 })
112
113 /* Add a value using relaxed read and relaxed write. Less expensive than
114 * fetch_add when there is no write concurrency.
115 */
116 #define NO_TEAR_ADD(x, val) WRITE_ONCE((x), READ_ONCE(x) + (val))
117 #define NO_TEAR_INC(x) NO_TEAR_ADD((x), 1)
118
119 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
120
121 #endif
122
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