258 lines
6.6 KiB
C
258 lines
6.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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* Copyright(c) 2017-2018 Jesper Dangaard Brouer, Red Hat Inc.
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*
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* XDP monitor tool, based on tracepoints
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*/
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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_PERCPU_ARRAY);
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__type(key, u32);
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__type(value, u64);
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__uint(max_entries, 2);
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/* TODO: have entries for all possible errno's */
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} redirect_err_cnt SEC(".maps");
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#define XDP_UNKNOWN XDP_REDIRECT + 1
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__type(key, u32);
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__type(value, u64);
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__uint(max_entries, XDP_UNKNOWN + 1);
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} exception_cnt SEC(".maps");
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/* Tracepoint format: /sys/kernel/debug/tracing/events/xdp/xdp_redirect/format
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* Code in: kernel/include/trace/events/xdp.h
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*/
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struct xdp_redirect_ctx {
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u64 __pad; // First 8 bytes are not accessible by bpf code
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int prog_id; // offset:8; size:4; signed:1;
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u32 act; // offset:12 size:4; signed:0;
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int ifindex; // offset:16 size:4; signed:1;
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int err; // offset:20 size:4; signed:1;
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int to_ifindex; // offset:24 size:4; signed:1;
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u32 map_id; // offset:28 size:4; signed:0;
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int map_index; // offset:32 size:4; signed:1;
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}; // offset:36
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enum {
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XDP_REDIRECT_SUCCESS = 0,
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XDP_REDIRECT_ERROR = 1
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};
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static __always_inline
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int xdp_redirect_collect_stat(struct xdp_redirect_ctx *ctx)
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{
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u32 key = XDP_REDIRECT_ERROR;
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int err = ctx->err;
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u64 *cnt;
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if (!err)
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key = XDP_REDIRECT_SUCCESS;
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cnt = bpf_map_lookup_elem(&redirect_err_cnt, &key);
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if (!cnt)
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return 1;
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*cnt += 1;
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return 0; /* Indicate event was filtered (no further processing)*/
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/*
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* Returning 1 here would allow e.g. a perf-record tracepoint
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* to see and record these events, but it doesn't work well
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* in-practice as stopping perf-record also unload this
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* bpf_prog. Plus, there is additional overhead of doing so.
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*/
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}
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SEC("tracepoint/xdp/xdp_redirect_err")
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int trace_xdp_redirect_err(struct xdp_redirect_ctx *ctx)
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{
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return xdp_redirect_collect_stat(ctx);
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}
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SEC("tracepoint/xdp/xdp_redirect_map_err")
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int trace_xdp_redirect_map_err(struct xdp_redirect_ctx *ctx)
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{
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return xdp_redirect_collect_stat(ctx);
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}
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/* Likely unloaded when prog starts */
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SEC("tracepoint/xdp/xdp_redirect")
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int trace_xdp_redirect(struct xdp_redirect_ctx *ctx)
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{
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return xdp_redirect_collect_stat(ctx);
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}
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/* Likely unloaded when prog starts */
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SEC("tracepoint/xdp/xdp_redirect_map")
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int trace_xdp_redirect_map(struct xdp_redirect_ctx *ctx)
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{
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return xdp_redirect_collect_stat(ctx);
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}
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/* Tracepoint format: /sys/kernel/debug/tracing/events/xdp/xdp_exception/format
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* Code in: kernel/include/trace/events/xdp.h
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*/
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struct xdp_exception_ctx {
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u64 __pad; // First 8 bytes are not accessible by bpf code
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int prog_id; // offset:8; size:4; signed:1;
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u32 act; // offset:12; size:4; signed:0;
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int ifindex; // offset:16; size:4; signed:1;
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};
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SEC("tracepoint/xdp/xdp_exception")
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int trace_xdp_exception(struct xdp_exception_ctx *ctx)
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{
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u64 *cnt;
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u32 key;
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key = ctx->act;
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if (key > XDP_REDIRECT)
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key = XDP_UNKNOWN;
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cnt = bpf_map_lookup_elem(&exception_cnt, &key);
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if (!cnt)
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return 1;
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*cnt += 1;
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return 0;
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}
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/* Common stats data record shared with _user.c */
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struct datarec {
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u64 processed;
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u64 dropped;
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u64 info;
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u64 err;
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};
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#define MAX_CPUS 64
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__type(key, u32);
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__type(value, struct datarec);
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__uint(max_entries, MAX_CPUS);
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} cpumap_enqueue_cnt SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__type(key, u32);
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__type(value, struct datarec);
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__uint(max_entries, 1);
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} cpumap_kthread_cnt SEC(".maps");
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/* Tracepoint: /sys/kernel/debug/tracing/events/xdp/xdp_cpumap_enqueue/format
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* Code in: kernel/include/trace/events/xdp.h
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*/
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struct cpumap_enqueue_ctx {
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u64 __pad; // First 8 bytes are not accessible by bpf code
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int map_id; // offset:8; size:4; signed:1;
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u32 act; // offset:12; size:4; signed:0;
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int cpu; // offset:16; size:4; signed:1;
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unsigned int drops; // offset:20; size:4; signed:0;
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unsigned int processed; // offset:24; size:4; signed:0;
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int to_cpu; // offset:28; size:4; signed:1;
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};
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SEC("tracepoint/xdp/xdp_cpumap_enqueue")
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int trace_xdp_cpumap_enqueue(struct cpumap_enqueue_ctx *ctx)
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{
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u32 to_cpu = ctx->to_cpu;
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struct datarec *rec;
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if (to_cpu >= MAX_CPUS)
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return 1;
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rec = bpf_map_lookup_elem(&cpumap_enqueue_cnt, &to_cpu);
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if (!rec)
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return 0;
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rec->processed += ctx->processed;
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rec->dropped += ctx->drops;
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/* Record bulk events, then userspace can calc average bulk size */
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if (ctx->processed > 0)
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rec->info += 1;
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return 0;
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}
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/* Tracepoint: /sys/kernel/debug/tracing/events/xdp/xdp_cpumap_kthread/format
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* Code in: kernel/include/trace/events/xdp.h
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*/
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struct cpumap_kthread_ctx {
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u64 __pad; // First 8 bytes are not accessible by bpf code
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int map_id; // offset:8; size:4; signed:1;
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u32 act; // offset:12; size:4; signed:0;
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int cpu; // offset:16; size:4; signed:1;
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unsigned int drops; // offset:20; size:4; signed:0;
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unsigned int processed; // offset:24; size:4; signed:0;
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int sched; // offset:28; size:4; signed:1;
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};
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SEC("tracepoint/xdp/xdp_cpumap_kthread")
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int trace_xdp_cpumap_kthread(struct cpumap_kthread_ctx *ctx)
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{
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struct datarec *rec;
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u32 key = 0;
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rec = bpf_map_lookup_elem(&cpumap_kthread_cnt, &key);
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if (!rec)
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return 0;
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rec->processed += ctx->processed;
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rec->dropped += ctx->drops;
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/* Count times kthread yielded CPU via schedule call */
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if (ctx->sched)
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rec->info++;
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return 0;
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}
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__type(key, u32);
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__type(value, struct datarec);
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__uint(max_entries, 1);
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} devmap_xmit_cnt SEC(".maps");
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/* Tracepoint: /sys/kernel/debug/tracing/events/xdp/xdp_devmap_xmit/format
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* Code in: kernel/include/trace/events/xdp.h
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*/
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struct devmap_xmit_ctx {
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u64 __pad; // First 8 bytes are not accessible by bpf code
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int from_ifindex; // offset:8; size:4; signed:1;
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u32 act; // offset:12; size:4; signed:0;
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int to_ifindex; // offset:16; size:4; signed:1;
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int drops; // offset:20; size:4; signed:1;
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int sent; // offset:24; size:4; signed:1;
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int err; // offset:28; size:4; signed:1;
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};
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SEC("tracepoint/xdp/xdp_devmap_xmit")
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int trace_xdp_devmap_xmit(struct devmap_xmit_ctx *ctx)
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{
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struct datarec *rec;
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u32 key = 0;
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rec = bpf_map_lookup_elem(&devmap_xmit_cnt, &key);
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if (!rec)
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return 0;
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rec->processed += ctx->sent;
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rec->dropped += ctx->drops;
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/* Record bulk events, then userspace can calc average bulk size */
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rec->info += 1;
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/* Record error cases, where no frame were sent */
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if (ctx->err)
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rec->err++;
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/* Catch API error of drv ndo_xdp_xmit sent more than count */
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if (ctx->drops < 0)
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rec->err++;
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return 1;
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}
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