+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0
- * Copyright(c) 2017-2018 Jesper Dangaard Brouer, Red Hat Inc.
- *
- * XDP monitor tool, based on tracepoints
- */
-#include <uapi/linux/bpf.h>
-#include <bpf/bpf_helpers.h>
-
-struct {
- __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
- __type(key, u32);
- __type(value, u64);
- __uint(max_entries, 2);
- /* TODO: have entries for all possible errno's */
-} redirect_err_cnt SEC(".maps");
-
-#define XDP_UNKNOWN XDP_REDIRECT + 1
-struct {
- __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
- __type(key, u32);
- __type(value, u64);
- __uint(max_entries, XDP_UNKNOWN + 1);
-} exception_cnt SEC(".maps");
-
-/* Tracepoint format: /sys/kernel/debug/tracing/events/xdp/xdp_redirect/format
- * Code in: kernel/include/trace/events/xdp.h
- */
-struct xdp_redirect_ctx {
- u64 __pad; // First 8 bytes are not accessible by bpf code
- int prog_id; // offset:8; size:4; signed:1;
- u32 act; // offset:12 size:4; signed:0;
- int ifindex; // offset:16 size:4; signed:1;
- int err; // offset:20 size:4; signed:1;
- int to_ifindex; // offset:24 size:4; signed:1;
- u32 map_id; // offset:28 size:4; signed:0;
- int map_index; // offset:32 size:4; signed:1;
-}; // offset:36
-
-enum {
- XDP_REDIRECT_SUCCESS = 0,
- XDP_REDIRECT_ERROR = 1
-};
-
-static __always_inline
-int xdp_redirect_collect_stat(struct xdp_redirect_ctx *ctx)
-{
- u32 key = XDP_REDIRECT_ERROR;
- int err = ctx->err;
- u64 *cnt;
-
- if (!err)
- key = XDP_REDIRECT_SUCCESS;
-
- cnt = bpf_map_lookup_elem(&redirect_err_cnt, &key);
- if (!cnt)
- return 1;
- *cnt += 1;
-
- return 0; /* Indicate event was filtered (no further processing)*/
- /*
- * Returning 1 here would allow e.g. a perf-record tracepoint
- * to see and record these events, but it doesn't work well
- * in-practice as stopping perf-record also unload this
- * bpf_prog. Plus, there is additional overhead of doing so.
- */
-}
-
-SEC("tracepoint/xdp/xdp_redirect_err")
-int trace_xdp_redirect_err(struct xdp_redirect_ctx *ctx)
-{
- return xdp_redirect_collect_stat(ctx);
-}
-
-
-SEC("tracepoint/xdp/xdp_redirect_map_err")
-int trace_xdp_redirect_map_err(struct xdp_redirect_ctx *ctx)
-{
- return xdp_redirect_collect_stat(ctx);
-}
-
-/* Likely unloaded when prog starts */
-SEC("tracepoint/xdp/xdp_redirect")
-int trace_xdp_redirect(struct xdp_redirect_ctx *ctx)
-{
- return xdp_redirect_collect_stat(ctx);
-}
-
-/* Likely unloaded when prog starts */
-SEC("tracepoint/xdp/xdp_redirect_map")
-int trace_xdp_redirect_map(struct xdp_redirect_ctx *ctx)
-{
- return xdp_redirect_collect_stat(ctx);
-}
-
-/* Tracepoint format: /sys/kernel/debug/tracing/events/xdp/xdp_exception/format
- * Code in: kernel/include/trace/events/xdp.h
- */
-struct xdp_exception_ctx {
- u64 __pad; // First 8 bytes are not accessible by bpf code
- int prog_id; // offset:8; size:4; signed:1;
- u32 act; // offset:12; size:4; signed:0;
- int ifindex; // offset:16; size:4; signed:1;
-};
-
-SEC("tracepoint/xdp/xdp_exception")
-int trace_xdp_exception(struct xdp_exception_ctx *ctx)
-{
- u64 *cnt;
- u32 key;
-
- key = ctx->act;
- if (key > XDP_REDIRECT)
- key = XDP_UNKNOWN;
-
- cnt = bpf_map_lookup_elem(&exception_cnt, &key);
- if (!cnt)
- return 1;
- *cnt += 1;
-
- return 0;
-}
-
-/* Common stats data record shared with _user.c */
-struct datarec {
- u64 processed;
- u64 dropped;
- u64 info;
- u64 err;
-};
-#define MAX_CPUS 64
-
-struct {
- __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
- __type(key, u32);
- __type(value, struct datarec);
- __uint(max_entries, MAX_CPUS);
-} cpumap_enqueue_cnt SEC(".maps");
-
-struct {
- __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
- __type(key, u32);
- __type(value, struct datarec);
- __uint(max_entries, 1);
-} cpumap_kthread_cnt SEC(".maps");
-
-/* Tracepoint: /sys/kernel/debug/tracing/events/xdp/xdp_cpumap_enqueue/format
- * Code in: kernel/include/trace/events/xdp.h
- */
-struct cpumap_enqueue_ctx {
- u64 __pad; // First 8 bytes are not accessible by bpf code
- int map_id; // offset:8; size:4; signed:1;
- u32 act; // offset:12; size:4; signed:0;
- int cpu; // offset:16; size:4; signed:1;
- unsigned int drops; // offset:20; size:4; signed:0;
- unsigned int processed; // offset:24; size:4; signed:0;
- int to_cpu; // offset:28; size:4; signed:1;
-};
-
-SEC("tracepoint/xdp/xdp_cpumap_enqueue")
-int trace_xdp_cpumap_enqueue(struct cpumap_enqueue_ctx *ctx)
-{
- u32 to_cpu = ctx->to_cpu;
- struct datarec *rec;
-
- if (to_cpu >= MAX_CPUS)
- return 1;
-
- rec = bpf_map_lookup_elem(&cpumap_enqueue_cnt, &to_cpu);
- if (!rec)
- return 0;
- rec->processed += ctx->processed;
- rec->dropped += ctx->drops;
-
- /* Record bulk events, then userspace can calc average bulk size */
- if (ctx->processed > 0)
- rec->info += 1;
-
- return 0;
-}
-
-/* Tracepoint: /sys/kernel/debug/tracing/events/xdp/xdp_cpumap_kthread/format
- * Code in: kernel/include/trace/events/xdp.h
- */
-struct cpumap_kthread_ctx {
- u64 __pad; // First 8 bytes are not accessible by bpf code
- int map_id; // offset:8; size:4; signed:1;
- u32 act; // offset:12; size:4; signed:0;
- int cpu; // offset:16; size:4; signed:1;
- unsigned int drops; // offset:20; size:4; signed:0;
- unsigned int processed; // offset:24; size:4; signed:0;
- int sched; // offset:28; size:4; signed:1;
-};
-
-SEC("tracepoint/xdp/xdp_cpumap_kthread")
-int trace_xdp_cpumap_kthread(struct cpumap_kthread_ctx *ctx)
-{
- struct datarec *rec;
- u32 key = 0;
-
- rec = bpf_map_lookup_elem(&cpumap_kthread_cnt, &key);
- if (!rec)
- return 0;
- rec->processed += ctx->processed;
- rec->dropped += ctx->drops;
-
- /* Count times kthread yielded CPU via schedule call */
- if (ctx->sched)
- rec->info++;
-
- return 0;
-}
-
-struct {
- __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
- __type(key, u32);
- __type(value, struct datarec);
- __uint(max_entries, 1);
-} devmap_xmit_cnt SEC(".maps");
-
-/* Tracepoint: /sys/kernel/debug/tracing/events/xdp/xdp_devmap_xmit/format
- * Code in: kernel/include/trace/events/xdp.h
- */
-struct devmap_xmit_ctx {
- u64 __pad; // First 8 bytes are not accessible by bpf code
- int from_ifindex; // offset:8; size:4; signed:1;
- u32 act; // offset:12; size:4; signed:0;
- int to_ifindex; // offset:16; size:4; signed:1;
- int drops; // offset:20; size:4; signed:1;
- int sent; // offset:24; size:4; signed:1;
- int err; // offset:28; size:4; signed:1;
-};
-
-SEC("tracepoint/xdp/xdp_devmap_xmit")
-int trace_xdp_devmap_xmit(struct devmap_xmit_ctx *ctx)
-{
- struct datarec *rec;
- u32 key = 0;
-
- rec = bpf_map_lookup_elem(&devmap_xmit_cnt, &key);
- if (!rec)
- return 0;
- rec->processed += ctx->sent;
- rec->dropped += ctx->drops;
-
- /* Record bulk events, then userspace can calc average bulk size */
- rec->info += 1;
-
- /* Record error cases, where no frame were sent */
- if (ctx->err)
- rec->err++;
-
- /* Catch API error of drv ndo_xdp_xmit sent more than count */
- if (ctx->drops < 0)
- rec->err++;
-
- return 1;
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff