xref: /openbmc/linux/samples/bpf/xdp_sample_user.h (revision 61afd3da)
1 // SPDX-License-Identifier: GPL-2.0-only
2 #ifndef XDP_SAMPLE_USER_H
3 #define XDP_SAMPLE_USER_H
4 
5 #include <bpf/libbpf.h>
6 #include <linux/compiler.h>
7 
8 #include "xdp_sample_shared.h"
9 
10 enum stats_mask {
11 	_SAMPLE_REDIRECT_MAP         = 1U << 0,
12 	SAMPLE_RX_CNT                = 1U << 1,
13 	SAMPLE_REDIRECT_ERR_CNT      = 1U << 2,
14 	SAMPLE_CPUMAP_ENQUEUE_CNT    = 1U << 3,
15 	SAMPLE_CPUMAP_KTHREAD_CNT    = 1U << 4,
16 	SAMPLE_EXCEPTION_CNT         = 1U << 5,
17 	SAMPLE_DEVMAP_XMIT_CNT       = 1U << 6,
18 	SAMPLE_REDIRECT_CNT          = 1U << 7,
19 	SAMPLE_REDIRECT_MAP_CNT      = SAMPLE_REDIRECT_CNT | _SAMPLE_REDIRECT_MAP,
20 	SAMPLE_REDIRECT_ERR_MAP_CNT  = SAMPLE_REDIRECT_ERR_CNT | _SAMPLE_REDIRECT_MAP,
21 	SAMPLE_DEVMAP_XMIT_CNT_MULTI = 1U << 8,
22 	SAMPLE_SKIP_HEADING	     = 1U << 9,
23 };
24 
25 /* Exit return codes */
26 #define EXIT_OK			0
27 #define EXIT_FAIL		1
28 #define EXIT_FAIL_OPTION	2
29 #define EXIT_FAIL_XDP		3
30 #define EXIT_FAIL_BPF		4
31 #define EXIT_FAIL_MEM		5
32 
33 int sample_setup_maps(struct bpf_map **maps);
34 int __sample_init(int mask);
35 void sample_exit(int status);
36 int sample_run(int interval, void (*post_cb)(void *), void *ctx);
37 
38 void sample_switch_mode(void);
39 int sample_install_xdp(struct bpf_program *xdp_prog, int ifindex, bool generic,
40 		       bool force);
41 void sample_usage(char *argv[], const struct option *long_options,
42 		  const char *doc, int mask, bool error);
43 
44 const char *get_driver_name(int ifindex);
45 int get_mac_addr(int ifindex, void *mac_addr);
46 
47 #pragma GCC diagnostic push
48 #ifndef __clang__
49 #pragma GCC diagnostic ignored "-Wstringop-truncation"
50 #endif
51 __attribute__((unused))
safe_strncpy(char * dst,const char * src,size_t size)52 static inline char *safe_strncpy(char *dst, const char *src, size_t size)
53 {
54 	if (!size)
55 		return dst;
56 	strncpy(dst, src, size - 1);
57 	dst[size - 1] = '\0';
58 	return dst;
59 }
60 #pragma GCC diagnostic pop
61 
62 #define __attach_tp(name)                                                      \
63 	({                                                                     \
64 		if (bpf_program__type(skel->progs.name) != BPF_PROG_TYPE_TRACING)\
65 			return -EINVAL;                                        \
66 		skel->links.name = bpf_program__attach(skel->progs.name);      \
67 		if (!skel->links.name)                                         \
68 			return -errno;                                         \
69 	})
70 
71 #define sample_init_pre_load(skel)                                             \
72 	({                                                                     \
73 		skel->rodata->nr_cpus = libbpf_num_possible_cpus();            \
74 		sample_setup_maps((struct bpf_map *[]){                        \
75 			skel->maps.rx_cnt, skel->maps.redir_err_cnt,           \
76 			skel->maps.cpumap_enqueue_cnt,                         \
77 			skel->maps.cpumap_kthread_cnt,                         \
78 			skel->maps.exception_cnt, skel->maps.devmap_xmit_cnt,  \
79 			skel->maps.devmap_xmit_cnt_multi });                   \
80 	})
81 
82 #define DEFINE_SAMPLE_INIT(name)                                               \
83 	static int sample_init(struct name *skel, int mask)                    \
84 	{                                                                      \
85 		int ret;                                                       \
86 		ret = __sample_init(mask);                                     \
87 		if (ret < 0)                                                   \
88 			return ret;                                            \
89 		if (mask & SAMPLE_REDIRECT_MAP_CNT)                            \
90 			__attach_tp(tp_xdp_redirect_map);                      \
91 		if (mask & SAMPLE_REDIRECT_CNT)                                \
92 			__attach_tp(tp_xdp_redirect);                          \
93 		if (mask & SAMPLE_REDIRECT_ERR_MAP_CNT)                        \
94 			__attach_tp(tp_xdp_redirect_map_err);                  \
95 		if (mask & SAMPLE_REDIRECT_ERR_CNT)                            \
96 			__attach_tp(tp_xdp_redirect_err);                      \
97 		if (mask & SAMPLE_CPUMAP_ENQUEUE_CNT)                          \
98 			__attach_tp(tp_xdp_cpumap_enqueue);                    \
99 		if (mask & SAMPLE_CPUMAP_KTHREAD_CNT)                          \
100 			__attach_tp(tp_xdp_cpumap_kthread);                    \
101 		if (mask & SAMPLE_EXCEPTION_CNT)                               \
102 			__attach_tp(tp_xdp_exception);                         \
103 		if (mask & SAMPLE_DEVMAP_XMIT_CNT)                             \
104 			__attach_tp(tp_xdp_devmap_xmit);                       \
105 		if (mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI)                       \
106 			__attach_tp(tp_xdp_devmap_xmit_multi);                 \
107 		return 0;                                                      \
108 	}
109 
110 #endif
111