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
19struct {
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
26struct {
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 */
45struct 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
77SEC("tracepoint/ib_umad/ib_umad_read_recv")
78int 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}
97SEC("tracepoint/ib_umad/ib_umad_read_send")
98int 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}
117SEC("tracepoint/ib_umad/ib_umad_write")
118int 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
138char _license[] SEC("license") = "GPL";
139