0ac01febd4
Provide a count of class types for a summary of MAD packets. The example shows one way to filter the trace data based on management class. Signed-off-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
145 lines
3.2 KiB
C
145 lines
3.2 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_helpers.h"
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struct bpf_map_def SEC("maps") read_count = {
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.type = BPF_MAP_TYPE_ARRAY,
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.key_size = sizeof(u32), /* class; u32 required */
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.value_size = sizeof(u64), /* count of mads read */
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.max_entries = 256, /* Room for all Classes */
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};
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struct bpf_map_def SEC("maps") write_count = {
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.type = BPF_MAP_TYPE_ARRAY,
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.key_size = sizeof(u32), /* class; u32 required */
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.value_size = sizeof(u64), /* count of mads written */
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.max_entries = 256, /* Room for all Classes */
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};
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#undef DEBUG
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#ifdef DEBUG
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#define bpf_debug(fmt, ...) \
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({ \
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char ____fmt[] = fmt; \
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bpf_trace_printk(____fmt, sizeof(____fmt), \
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##__VA_ARGS__); \
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})
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#else
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#define bpf_debug(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/debug/tracing/events/ib_umad/ib_umad_read/format
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* /sys/kernel/debug/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_debug("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_debug("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_debug("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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