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The canonical location for the tracefs filesystem is at /sys/kernel/tracing. But, from Documentation/trace/ftrace.rst: Before 4.1, all ftrace tracing control files were within the debugfs file system, which is typically located at /sys/kernel/debug/tracing. For backward compatibility, when mounting the debugfs file system, the tracefs file system will be automatically mounted at: /sys/kernel/debug/tracing Many comments and samples in the bpf code still refer to this older debugfs path, so let's update them to avoid confusion. There are a few spots where the bpf code explicitly checks both tracefs and debugfs (tools/bpf/bpftool/tracelog.c and tools/lib/api/fs/fs.c) and I've left those alone so that the tools can continue to work with both paths. Signed-off-by: Ross Zwisler <zwisler@google.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Link: https://lore.kernel.org/r/20230313205628.1058720-2-zwisler@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>
139 lines
2.9 KiB
C
139 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
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/*
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* ibumad BPF sample kernel side
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* Copyright(c) 2018 Ira Weiny, Intel Corporation
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*/
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#define KBUILD_MODNAME "ibumad_count_pkts_by_class"
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#include <uapi/linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__type(key, u32); /* class; u32 required */
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__type(value, u64); /* count of mads read */
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__uint(max_entries, 256); /* Room for all Classes */
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} read_count SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__type(key, u32); /* class; u32 required */
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__type(value, u64); /* count of mads written */
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__uint(max_entries, 256); /* Room for all Classes */
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} write_count SEC(".maps");
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#undef DEBUG
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#ifndef DEBUG
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#undef bpf_printk
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#define bpf_printk(fmt, ...)
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#endif
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/* Taken from the current format defined in
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* include/trace/events/ib_umad.h
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* and
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* /sys/kernel/tracing/events/ib_umad/ib_umad_read/format
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* /sys/kernel/tracing/events/ib_umad/ib_umad_write/format
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*/
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struct ib_umad_rw_args {
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u64 pad;
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u8 port_num;
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u8 sl;
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u8 path_bits;
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u8 grh_present;
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u32 id;
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u32 status;
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u32 timeout_ms;
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u32 retires;
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u32 length;
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u32 qpn;
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u32 qkey;
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u8 gid_index;
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u8 hop_limit;
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u16 lid;
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u16 attr_id;
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u16 pkey_index;
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u8 base_version;
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u8 mgmt_class;
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u8 class_version;
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u8 method;
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u32 flow_label;
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u16 mad_status;
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u16 class_specific;
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u32 attr_mod;
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u64 tid;
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u8 gid[16];
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u32 dev_index;
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u8 traffic_class;
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};
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SEC("tracepoint/ib_umad/ib_umad_read_recv")
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int on_ib_umad_read_recv(struct ib_umad_rw_args *ctx)
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{
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u64 zero = 0, *val;
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u8 class = ctx->mgmt_class;
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bpf_printk("ib_umad read recv : class 0x%x\n", class);
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val = bpf_map_lookup_elem(&read_count, &class);
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if (!val) {
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bpf_map_update_elem(&read_count, &class, &zero, BPF_NOEXIST);
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val = bpf_map_lookup_elem(&read_count, &class);
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if (!val)
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return 0;
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}
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(*val) += 1;
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return 0;
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}
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SEC("tracepoint/ib_umad/ib_umad_read_send")
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int on_ib_umad_read_send(struct ib_umad_rw_args *ctx)
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{
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u64 zero = 0, *val;
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u8 class = ctx->mgmt_class;
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bpf_printk("ib_umad read send : class 0x%x\n", class);
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val = bpf_map_lookup_elem(&read_count, &class);
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if (!val) {
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bpf_map_update_elem(&read_count, &class, &zero, BPF_NOEXIST);
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val = bpf_map_lookup_elem(&read_count, &class);
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if (!val)
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return 0;
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}
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(*val) += 1;
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return 0;
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}
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SEC("tracepoint/ib_umad/ib_umad_write")
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int on_ib_umad_write(struct ib_umad_rw_args *ctx)
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{
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u64 zero = 0, *val;
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u8 class = ctx->mgmt_class;
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bpf_printk("ib_umad write : class 0x%x\n", class);
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val = bpf_map_lookup_elem(&write_count, &class);
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if (!val) {
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bpf_map_update_elem(&write_count, &class, &zero, BPF_NOEXIST);
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val = bpf_map_lookup_elem(&write_count, &class);
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if (!val)
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return 0;
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}
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(*val) += 1;
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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