1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2
3 /*
4 * ibumad BPF sample kernel side
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * Copyright(c) 2018 Ira Weiny, Intel Corporation
11 */
12
13 #define KBUILD_MODNAME "ibumad_count_pkts_by_class"
14 #include <uapi/linux/bpf.h>
15
16 #include <bpf/bpf_helpers.h>
17
18
19 struct {
20 __uint(type, BPF_MAP_TYPE_ARRAY);
21 __type(key, u32); /* class; u32 required */
22 __type(value, u64); /* count of mads read */
23 __uint(max_entries, 256); /* Room for all Classes */
24 } read_count SEC(".maps");
25
26 struct {
27 __uint(type, BPF_MAP_TYPE_ARRAY);
28 __type(key, u32); /* class; u32 required */
29 __type(value, u64); /* count of mads written */
30 __uint(max_entries, 256); /* Room for all Classes */
31 } write_count SEC(".maps");
32
33 #undef DEBUG
34 #ifndef DEBUG
35 #undef bpf_printk
36 #define bpf_printk(fmt, ...)
37 #endif
38
39 /* Taken from the current format defined in
40 * include/trace/events/ib_umad.h
41 * and
42 * /sys/kernel/tracing/events/ib_umad/ib_umad_read/format
43 * /sys/kernel/tracing/events/ib_umad/ib_umad_write/format
44 */
45 struct ib_umad_rw_args {
46 u64 pad;
47 u8 port_num;
48 u8 sl;
49 u8 path_bits;
50 u8 grh_present;
51 u32 id;
52 u32 status;
53 u32 timeout_ms;
54 u32 retires;
55 u32 length;
56 u32 qpn;
57 u32 qkey;
58 u8 gid_index;
59 u8 hop_limit;
60 u16 lid;
61 u16 attr_id;
62 u16 pkey_index;
63 u8 base_version;
64 u8 mgmt_class;
65 u8 class_version;
66 u8 method;
67 u32 flow_label;
68 u16 mad_status;
69 u16 class_specific;
70 u32 attr_mod;
71 u64 tid;
72 u8 gid[16];
73 u32 dev_index;
74 u8 traffic_class;
75 };
76
77 SEC("tracepoint/ib_umad/ib_umad_read_recv")
78 int on_ib_umad_read_recv(struct ib_umad_rw_args *ctx)
79 {
80 u64 zero = 0, *val;
81 u8 class = ctx->mgmt_class;
82
83 bpf_printk("ib_umad read recv : class 0x%x\n", class);
84
85 val = bpf_map_lookup_elem(&read_count, &class);
86 if (!val) {
87 bpf_map_update_elem(&read_count, &class, &zero, BPF_NOEXIST);
88 val = bpf_map_lookup_elem(&read_count, &class);
89 if (!val)
90 return 0;
91 }
92
93 (*val) += 1;
94
95 return 0;
96 }
97 SEC("tracepoint/ib_umad/ib_umad_read_send")
98 int on_ib_umad_read_send(struct ib_umad_rw_args *ctx)
99 {
100 u64 zero = 0, *val;
101 u8 class = ctx->mgmt_class;
102
103 bpf_printk("ib_umad read send : class 0x%x\n", class);
104
105 val = bpf_map_lookup_elem(&read_count, &class);
106 if (!val) {
107 bpf_map_update_elem(&read_count, &class, &zero, BPF_NOEXIST);
108 val = bpf_map_lookup_elem(&read_count, &class);
109 if (!val)
110 return 0;
111 }
112
113 (*val) += 1;
114
115 return 0;
116 }
117 SEC("tracepoint/ib_umad/ib_umad_write")
118 int on_ib_umad_write(struct ib_umad_rw_args *ctx)
119 {
120 u64 zero = 0, *val;
121 u8 class = ctx->mgmt_class;
122
123 bpf_printk("ib_umad write : class 0x%x\n", class);
124
125 val = bpf_map_lookup_elem(&write_count, &class);
126 if (!val) {
127 bpf_map_update_elem(&write_count, &class, &zero, BPF_NOEXIST);
128 val = bpf_map_lookup_elem(&write_count, &class);
129 if (!val)
130 return 0;
131 }
132
133 (*val) += 1;
134
135 return 0;
136 }
137
138 char _license[] SEC("license") = "GPL";
139
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