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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Isovalent */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
char _license[] SEC("license") = "GPL";
struct {
__uint(type, BPF_MAP_TYPE_HASH);
} hash_map_bench SEC(".maps");
/* The number of slots to store times */
#define NR_SLOTS 32
#define NR_CPUS 256
#define CPU_MASK (NR_CPUS-1)
/* Configured by userspace */
u64 nr_entries;
u64 nr_loops;
u32 __attribute__((__aligned__(8))) key[NR_CPUS];
/* Filled by us */
u64 __attribute__((__aligned__(256))) percpu_times_index[NR_CPUS];
u64 __attribute__((__aligned__(256))) percpu_times[NR_CPUS][NR_SLOTS];
static inline void patch_key(u32 i)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
key[0] = i + 1;
#else
key[0] = __builtin_bswap32(i + 1);
#endif
/* the rest of key is random and is configured by userspace */
}
static int lookup_callback(__u32 index, u32 *unused)
{
patch_key(index);
return bpf_map_lookup_elem(&hash_map_bench, key) ? 0 : 1;
}
static int loop_lookup_callback(__u32 index, u32 *unused)
{
return bpf_loop(nr_entries, lookup_callback, NULL, 0) ? 0 : 1;
}
SEC("fentry/" SYS_PREFIX "sys_getpgid")
int benchmark(void *ctx)
{
u32 cpu = bpf_get_smp_processor_id();
u32 times_index;
u64 start_time;
times_index = percpu_times_index[cpu & CPU_MASK] % NR_SLOTS;
start_time = bpf_ktime_get_ns();
bpf_loop(nr_loops, loop_lookup_callback, NULL, 0);
percpu_times[cpu & CPU_MASK][times_index] = bpf_ktime_get_ns() - start_time;
percpu_times_index[cpu & CPU_MASK] += 1;
return 0;
}
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