path: root/tools/bpf/bpftool/link.c

// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2020 Facebook */

#include <errno.h>
#include <linux/err.h>
#include <linux/netfilter.h>
#include <linux/netfilter_arp.h>
#include <linux/perf_event.h>
#include <net/if.h>
#include <stdio.h>
#include <unistd.h>

#include <bpf/bpf.h>
#include <bpf/hashmap.h>

#include "json_writer.h"
#include "main.h"
#include "xlated_dumper.h"

#define PERF_HW_CACHE_LEN 128

static struct hashmap *link_table;
static struct dump_data dd;

static const char *perf_type_name[PERF_TYPE_MAX] = {
	[PERF_TYPE_HARDWARE]			= "hardware",
	[PERF_TYPE_SOFTWARE]			= "software",
	[PERF_TYPE_TRACEPOINT]			= "tracepoint",
	[PERF_TYPE_HW_CACHE]			= "hw-cache",
	[PERF_TYPE_RAW]				= "raw",
	[PERF_TYPE_BREAKPOINT]			= "breakpoint",
};

const char *event_symbols_hw[PERF_COUNT_HW_MAX] = {
	[PERF_COUNT_HW_CPU_CYCLES]		= "cpu-cycles",
	[PERF_COUNT_HW_INSTRUCTIONS]		= "instructions",
	[PERF_COUNT_HW_CACHE_REFERENCES]	= "cache-references",
	[PERF_COUNT_HW_CACHE_MISSES]		= "cache-misses",
	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS]	= "branch-instructions",
	[PERF_COUNT_HW_BRANCH_MISSES]		= "branch-misses",
	[PERF_COUNT_HW_BUS_CYCLES]		= "bus-cycles",
	[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND]	= "stalled-cycles-frontend",
	[PERF_COUNT_HW_STALLED_CYCLES_BACKEND]	= "stalled-cycles-backend",
	[PERF_COUNT_HW_REF_CPU_CYCLES]		= "ref-cycles",
};

const char *event_symbols_sw[PERF_COUNT_SW_MAX] = {
	[PERF_COUNT_SW_CPU_CLOCK]		= "cpu-clock",
	[PERF_COUNT_SW_TASK_CLOCK]		= "task-clock",
	[PERF_COUNT_SW_PAGE_FAULTS]		= "page-faults",
	[PERF_COUNT_SW_CONTEXT_SWITCHES]	= "context-switches",
	[PERF_COUNT_SW_CPU_MIGRATIONS]		= "cpu-migrations",
	[PERF_COUNT_SW_PAGE_FAULTS_MIN]		= "minor-faults",
	[PERF_COUNT_SW_PAGE_FAULTS_MAJ]		= "major-faults",
	[PERF_COUNT_SW_ALIGNMENT_FAULTS]	= "alignment-faults",
	[PERF_COUNT_SW_EMULATION_FAULTS]	= "emulation-faults",
	[PERF_COUNT_SW_DUMMY]			= "dummy",
	[PERF_COUNT_SW_BPF_OUTPUT]		= "bpf-output",
	[PERF_COUNT_SW_CGROUP_SWITCHES]		= "cgroup-switches",
};

const char *evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX] = {
	[PERF_COUNT_HW_CACHE_L1D]		= "L1-dcache",
	[PERF_COUNT_HW_CACHE_L1I]		= "L1-icache",
	[PERF_COUNT_HW_CACHE_LL]		= "LLC",
	[PERF_COUNT_HW_CACHE_DTLB]		= "dTLB",
	[PERF_COUNT_HW_CACHE_ITLB]		= "iTLB",
	[PERF_COUNT_HW_CACHE_BPU]		= "branch",
	[PERF_COUNT_HW_CACHE_NODE]		= "node",
};

const char *evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX] = {
	[PERF_COUNT_HW_CACHE_OP_READ]		= "load",
	[PERF_COUNT_HW_CACHE_OP_WRITE]		= "store",
	[PERF_COUNT_HW_CACHE_OP_PREFETCH]	= "prefetch",
};

const char *evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX] = {
	[PERF_COUNT_HW_CACHE_RESULT_ACCESS]	= "refs",
	[PERF_COUNT_HW_CACHE_RESULT_MISS]	= "misses",
};

#define perf_event_name(array, id) ({			\
	const char *event_str = NULL;			\
							\
	if ((id) < ARRAY_SIZE(array))			\
		event_str = array[id];			\
	event_str;					\
})

static int link_parse_fd(int *argc, char ***argv)
{
	int fd;

	if (is_prefix(**argv, "id")) {
		unsigned int id;
		char *endptr;

		NEXT_ARGP();

		id = strtoul(**argv, &endptr, 0);
		if (*endptr) {
			p_err("can't parse %s as ID", **argv);
			return -1;
		}
		NEXT_ARGP();

		fd = bpf_link_get_fd_by_id(id);
		if (fd < 0)
			p_err("failed to get link with ID %d: %s", id, strerror(errno));
		return fd;
	} else if (is_prefix(**argv, "pinned")) {
		char *path;

		NEXT_ARGP();

		path = **argv;
		NEXT_ARGP();

		return open_obj_pinned_any(path, BPF_OBJ_LINK);
	}

	p_err("expected 'id' or 'pinned', got: '%s'?", **argv);
	return -1;
}

static void
show_link_header_json(struct bpf_link_info *info, json_writer_t *wtr)
{
	const char *link_type_str;

	jsonw_uint_field(wtr, "id", info->id);
	link_type_str = libbpf_bpf_link_type_str(info->type);
	if (link_type_str)
		jsonw_string_field(wtr, "type", link_type_str);
	else
		jsonw_uint_field(wtr, "type", info->type);

	jsonw_uint_field(json_wtr, "prog_id", info->prog_id);
}

static void show_link_attach_type_json(__u32 attach_type, json_writer_t *wtr)
{
	const char *attach_type_str;

	attach_type_str = libbpf_bpf_attach_type_str(attach_type);
	if (attach_type_str)
		jsonw_string_field(wtr, "attach_type", attach_type_str);
	else
		jsonw_uint_field(wtr, "attach_type", attach_type);
}

static void show_link_ifindex_json(__u32 ifindex, json_writer_t *wtr)
{
	char devname[IF_NAMESIZE] = "(unknown)";

	if (ifindex)
		if_indextoname(ifindex, devname)