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selftests/bpf: switch test_tcpnotify to perf_buffer API 

Switch test_tcpnotify test to use libbpf's perf_buffer API instead of
re-implementing portion of it.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2019-07-23 14:34:42 -07:00 committed by Alexei Starovoitov
parent 58b8081536
commit 898ca681cd
1 changed files with 39 additions and 57 deletions
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96
tools/testing/selftests/bpf/test_tcpnotify_user.c
View File

@ -17,6 +17,7 @@
#include <linux/rtnetlink.h>
#include <signal.h>
#include <linux/perf_event.h>
#include <linux/err.h>
#include "bpf_rlimit.h"
#include "bpf_util.h"
@ -30,28 +31,34 @@
pthread_t tid;
int rx_callbacks;
static int dummyfn(void *data, int size)
static void dummyfn(void *ctx, int cpu, void *data, __u32 size)
{
struct tcp_notifier *t = data;
if (t->type != 0xde || t->subtype != 0xad ||
t->source != 0xbe || t->hash != 0xef)
return 1;
return;
rx_callbacks++;
return 0;
}
void tcp_notifier_poller(int fd)
void tcp_notifier_poller(struct perf_buffer *pb)
{
while (1)
perf_event_poller(fd, dummyfn);
int err;
while (1) {
err = perf_buffer__poll(pb, 100);
if (err < 0 && err != -EINTR) {
printf("failed perf_buffer__poll: %d\n", err);
return;
}
}
}
static void *poller_thread(void *arg)
{
int fd = *(int *)arg;
struct perf_buffer *pb = arg;
tcp_notifier_poller(fd);
tcp_notifier_poller(pb);
return arg;
}
@ -60,52 +67,20 @@ int verify_result(const struct tcpnotify_globals *result)
return (result->ncalls > 0 && result->ncalls == rx_callbacks ? 0 : 1);
}
static int bpf_find_map(const char *test, struct bpf_object *obj,
const char *name)
{
struct bpf_map *map;
map = bpf_object__find_map_by_name(obj, name);
if (!map) {
printf("%s:FAIL:map '%s' not found\n", test, name);
return -1;
}
return bpf_map__fd(map);
}
static int setup_bpf_perf_event(int mapfd)
{
struct perf_event_attr attr = {
.sample_type = PERF_SAMPLE_RAW,
.type = PERF_TYPE_SOFTWARE,
.config = PERF_COUNT_SW_BPF_OUTPUT,
};
int key = 0;
int pmu_fd;
pmu_fd = syscall(__NR_perf_event_open, &attr, -1, 0, -1, 0);
if (pmu_fd < 0)
return pmu_fd;
bpf_map_update_elem(mapfd, &key, &pmu_fd, BPF_ANY);
ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
return pmu_fd;
}
int main(int argc, char **argv)
{
const char *file = "test_tcpnotify_kern.o";
int prog_fd, map_fd, perf_event_fd;
struct bpf_map *perf_map, *global_map;
struct perf_buffer_opts pb_opts = {};
struct tcpnotify_globals g = {0};
struct perf_buffer *pb = NULL;
const char *cg_path = "/foo";
int prog_fd, rv, cg_fd = -1;
int error = EXIT_FAILURE;
struct bpf_object *obj;
int cg_fd = -1;
__u32 key = 0;
int rv;
char test_script[80];
int pmu_fd;
cpu_set_t cpuset;
__u32 key = 0;
CPU_ZERO(&cpuset);
CPU_SET(0, &cpuset);
@ -133,19 +108,24 @@ int main(int argc, char **argv)
goto err;
}
perf_event_fd = bpf_find_map(__func__, obj, "perf_event_map");
if (perf_event_fd < 0)
perf_map = bpf_object__find_map_by_name(obj, "perf_event_map");
if (!perf_map) {
printf("FAIL:map '%s' not found\n", "perf_event_map");
goto err;
}
global_map = bpf_object__find_map_by_name(obj, "global_map");
if (!global_map) {
printf("FAIL:map '%s' not found\n", "global_map");
return -1;
}
pb_opts.sample_cb = dummyfn;
pb = perf_buffer__new(bpf_map__fd(perf_map), 8, &pb_opts);
if (IS_ERR(pb))
goto err;
map_fd = bpf_find_map(__func__, obj, "global_map");
if (map_fd < 0)
goto err;
pmu_fd = setup_bpf_perf_event(perf_event_fd);
if (pmu_fd < 0 || perf_event_mmap(pmu_fd) < 0)
goto err;
pthread_create(&tid, NULL, poller_thread, (void *)&pmu_fd);
pthread_create(&tid, NULL, poller_thread, pb);
sprintf(test_script,
"iptables -A INPUT -p tcp --dport %d -j DROP",
@ -162,7 +142,7 @@ int main(int argc, char **argv)
TESTPORT);
system(test_script);
rv = bpf_map_lookup_elem(map_fd, &key, &g);
rv = bpf_map_lookup_elem(bpf_map__fd(global_map), &key, &g);
if (rv != 0) {
printf("FAILED: bpf_map_lookup_elem returns %d\n", rv);
goto err;
@ -182,5 +162,7 @@ int main(int argc, char **argv)
bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
close(cg_fd);
cleanup_cgroup_environment();
if (!IS_ERR_OR_NULL(pb))
perf_buffer__free(pb);
return error;
}