mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
a570e48fee
Update xdp_monitor to use the recently added err code introduced in tracepoint xdp:xdp_devmap_xmit, to show if the drop count is caused by some driver general delivery problem. Other kind of drops will likely just be more normal TX space issues. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
260 lines
6.7 KiB
C
260 lines
6.7 KiB
C
/* 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_helpers.h"
|
|
|
|
struct bpf_map_def SEC("maps") redirect_err_cnt = {
|
|
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
|
|
.key_size = sizeof(u32),
|
|
.value_size = sizeof(u64),
|
|
.max_entries = 2,
|
|
/* TODO: have entries for all possible errno's */
|
|
};
|
|
|
|
#define XDP_UNKNOWN XDP_REDIRECT + 1
|
|
struct bpf_map_def SEC("maps") exception_cnt = {
|
|
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
|
|
.key_size = sizeof(u32),
|
|
.value_size = sizeof(u64),
|
|
.max_entries = XDP_UNKNOWN + 1,
|
|
};
|
|
|
|
/* 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 bpf_map_def SEC("maps") cpumap_enqueue_cnt = {
|
|
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
|
|
.key_size = sizeof(u32),
|
|
.value_size = sizeof(struct datarec),
|
|
.max_entries = MAX_CPUS,
|
|
};
|
|
|
|
struct bpf_map_def SEC("maps") cpumap_kthread_cnt = {
|
|
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
|
|
.key_size = sizeof(u32),
|
|
.value_size = sizeof(struct datarec),
|
|
.max_entries = 1,
|
|
};
|
|
|
|
/* 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 bpf_map_def SEC("maps") devmap_xmit_cnt = {
|
|
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
|
|
.key_size = sizeof(u32),
|
|
.value_size = sizeof(struct datarec),
|
|
.max_entries = 1,
|
|
};
|
|
|
|
/* 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 map_id; // offset:8; size:4; signed:1;
|
|
u32 act; // offset:12; size:4; signed:0;
|
|
u32 map_index; // offset:16; size:4; signed:0;
|
|
int drops; // offset:20; size:4; signed:1;
|
|
int sent; // offset:24; size:4; signed:1;
|
|
int from_ifindex; // offset:28; size:4; signed:1;
|
|
int to_ifindex; // offset:32; size:4; signed:1;
|
|
int err; // offset:36; 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;
|
|
}
|