[PATCH bpf-next v3 2/2] samples: bpf: refactor perf_event user program with libbpf bpf_link

["Daniel T. Lee" <danieltimlee@gmail.com>]

The bpf_program__attach of libbpf(using bpf_link) is much more intuitive
than the previous method using ioctl.

bpf_program__attach_perf_event manages the enable of perf_event and
attach of BPF programs to it, so there's no neeed to do this
directly with ioctl.

In addition, bpf_link provides consistency in the use of API because it
allows disable (detach, destroy) for multiple events to be treated as
one bpf_link__destroy. Also, bpf_link__destroy manages the close() of
perf_event fd.

This commit refactors samples that attach the bpf program to perf_event
by using libbbpf instead of ioctl. Also the bpf_load in the samples were
removed and migrated to use libbbpf API.

Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
---
Changes in v2:
 - check memory allocation is successful
 - clean up allocated memory on error

Changes in v3:
 - Improve pointer error check (IS_ERR())
 - change to calloc for easier destroy of bpf_link
 - remove perf_event fd list since bpf_link handles fd
 - use newer bpf_object__{open/load} API instead of bpf_prog_load
 - perf_event for _SC_NPROCESSORS_ONLN instead of _SC_NPROCESSORS_CONF
 - find program with name explicitly instead of bpf_program__next
 - unconditional bpf_link__destroy() on cleanup
 - return error code on int_exit

 samples/bpf/Makefile           |   4 +-
 samples/bpf/sampleip_user.c    | 100 ++++++++++++++++++++++-----------
 samples/bpf/trace_event_user.c |  89 ++++++++++++++++++++---------
 3 files changed, 131 insertions(+), 62 deletions(-)

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index ff0061467dd3..424f6fe7ce38 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -88,8 +88,8 @@ xdp2-objs := xdp1_user.o
 xdp_router_ipv4-objs := xdp_router_ipv4_user.o
 test_current_task_under_cgroup-objs := bpf_load.o $(CGROUP_HELPERS) \
 				       test_current_task_under_cgroup_user.o
-trace_event-objs := bpf_load.o trace_event_user.o $(TRACE_HELPERS)
-sampleip-objs := bpf_load.o sampleip_user.o $(TRACE_HELPERS)
+trace_event-objs := trace_event_user.o $(TRACE_HELPERS)
+sampleip-objs := sampleip_user.o $(TRACE_HELPERS)
 tc_l2_redirect-objs := bpf_load.o tc_l2_redirect_user.o
 lwt_len_hist-objs := bpf_load.o lwt_len_hist_user.o
 xdp_tx_iptunnel-objs := xdp_tx_iptunnel_user.o
diff --git a/samples/bpf/sampleip_user.c b/samples/bpf/sampleip_user.c
index b0f115f938bc..05eca7b00e22 100644
--- a/samples/bpf/sampleip_user.c
+++ b/samples/bpf/sampleip_user.c
@@ -10,21 +10,23 @@
 #include <errno.h>
 #include <signal.h>
 #include <string.h>
-#include <assert.h>
 #include <linux/perf_event.h>
 #include <linux/ptrace.h>
 #include <linux/bpf.h>
-#include <sys/ioctl.h>
+#include <bpf/bpf.h>
 #include <bpf/libbpf.h>
-#include "bpf_load.h"
 #include "perf-sys.h"
 #include "trace_helpers.h"
 
+#define __must_check
+#include <linux/err.h>
+
 #define DEFAULT_FREQ	99
 #define DEFAULT_SECS	5
 #define MAX_IPS		8192
 #define PAGE_OFFSET	0xffff880000000000
 
+static int map_fd;
 static int nr_cpus;
 
 static void usage(void)
@@ -34,9 +36,10 @@ static void usage(void)
 	printf("       duration   # sampling duration (seconds), default 5\n");
 }
 
-static int sampling_start(int *pmu_fd, int freq)
+static int sampling_start(int freq, struct bpf_program *prog,
+			  struct bpf_link *links[])
 {
-	int i;
+	int i, pmu_fd;
 
 	struct perf_event_attr pe_sample_attr = {
 		.type = PERF_TYPE_SOFTWARE,
@@ -47,26 +50,29 @@ static int sampling_start(int *pmu_fd, int freq)
 	};
 
 	for (i = 0; i < nr_cpus; i++) {
-		pmu_fd[i] = sys_perf_event_open(&pe_sample_attr, -1 /* pid */, i,
+		pmu_fd = sys_perf_event_open(&pe_sample_attr, -1 /* pid */, i,
 					    -1 /* group_fd */, 0 /* flags */);
-		if (pmu_fd[i] < 0) {
+		if (pmu_fd < 0) {
 			fprintf(stderr, "ERROR: Initializing perf sampling\n");
 			return 1;
 		}
-		assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF,
-			     prog_fd[0]) == 0);
-		assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE, 0) == 0);
+		links[i] = bpf_program__attach_perf_event(prog, pmu_fd);
+		if (IS_ERR(links[i])) {
+			fprintf(stderr, "ERROR: Attach perf event\n");
+			close(pmu_fd);
+			return 1;
+		}
 	}
 
 	return 0;
 }
 
-static void sampling_end(int *pmu_fd)
+static void sampling_end(struct bpf_link *links[])
 {
 	int i;
 
 	for (i = 0; i < nr_cpus; i++)
-		close(pmu_fd[i]);
+		bpf_link__destroy(links[i]);
 }
 
 struct ipcount {
@@ -128,14 +134,17 @@ static void print_ip_map(int fd)
 static void int_exit(int sig)
 {
 	printf("\n");
-	print_ip_map(map_fd[0]);
+	print_ip_map(map_fd);
 	exit(0);
 }
 
 int main(int argc, char **argv)
 {
+	int opt, freq = DEFAULT_FREQ, secs = DEFAULT_SECS, error = 0;
+	struct bpf_program *prog;
+	struct bpf_object *obj;
+	struct bpf_link **links;
 	char filename[256];
-	int *pmu_fd, opt, freq = DEFAULT_FREQ, secs = DEFAULT_SECS;
 
 	/* process arguments */
 	while ((opt = getopt(argc, argv, "F:h")) != -1) {
@@ -163,38 +172,61 @@ int main(int argc, char **argv)
 	}
 
 	/* create perf FDs for each CPU */
-	nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
-	pmu_fd = malloc(nr_cpus * sizeof(int));
-	if (pmu_fd == NULL) {
-		fprintf(stderr, "ERROR: malloc of pmu_fd\n");
-		return 1;
+	nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+	links = calloc(nr_cpus, sizeof(struct bpf_link *));
+	if (!links) {
+		fprintf(stderr, "ERROR: malloc of links\n");
+		error = 1;
+		goto cleanup;
 	}
 
-	/* load BPF program */
 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
-	if (load_bpf_file(filename)) {
-		fprintf(stderr, "ERROR: loading BPF program (errno %d):\n",
-			errno);
-		if (strcmp(bpf_log_buf, "") == 0)
-			fprintf(stderr, "Try: ulimit -l unlimited\n");
-		else
-			fprintf(stderr, "%s", bpf_log_buf);
-		return 1;
+	obj = bpf_object__open_file(filename, NULL);
+	if (IS_ERR(obj)) {
+		fprintf(stderr, "ERROR: opening BPF object file failed\n");
+		error = 1;
+		goto cleanup;
+	}
+
+	prog = bpf_object__find_program_by_name(obj, "do_sample");
+	if (!prog) {
+		fprintf(stderr, "ERROR: finding a prog in obj file failed\n");
+		error = 1;
+		goto cleanup;
 	}
+
+	/* load BPF program */
+	if (bpf_object__load(obj)) {
+		fprintf(stderr, "ERROR: loading BPF object file failed\n");
+		error = 1;
+		goto cleanup;
+	}
+
+	map_fd = bpf_object__find_map_fd_by_name(obj, "ip_map");
+	if (map_fd < 0) {
+		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
+		error = 1;
+		goto cleanup;
+	}
+
 	signal(SIGINT, int_exit);
 	signal(SIGTERM, int_exit);
 
 	/* do sampling */
 	printf("Sampling at %d Hertz for %d seconds. Ctrl-C also ends.\n",
 	       freq, secs);
-	if (sampling_start(pmu_fd, freq) != 0)
-		return 1;
+	if (sampling_start(freq, prog, links) != 0) {
+		error = 1;
+		goto cleanup;
+	}
 	sleep(secs);
-	sampling_end(pmu_fd);
-	free(pmu_fd);
 
+cleanup:
+	sampling_end(links);
 	/* output sample counts */
-	print_ip_map(map_fd[0]);
+	if (!error)
+		print_ip_map(map_fd);
 
-	return 0;
+	free(links);
+	return error;
 }
diff --git a/samples/bpf/trace_event_user.c b/samples/bpf/trace_event_user.c
index 356171bc392b..5f64ff524cc3 100644
--- a/samples/bpf/trace_event_user.c
+++ b/samples/bpf/trace_event_user.c
@@ -6,22 +6,24 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <string.h>
-#include <fcntl.h>
-#include <poll.h>
-#include <sys/ioctl.h>
 #include <linux/perf_event.h>
 #include <linux/bpf.h>
 #include <signal.h>
-#include <assert.h>
 #include <errno.h>
 #include <sys/resource.h>
+#include <bpf/bpf.h>
 #include <bpf/libbpf.h>
-#include "bpf_load.h"
 #include "perf-sys.h"
 #include "trace_helpers.h"
 
+#define __must_check
+#include <linux/err.h>
+
 #define SAMPLE_FREQ 50
 
+/* counts, stackmap */
+static int map_fd[2];
+struct bpf_program *prog;
 static bool sys_read_seen, sys_write_seen;
 
 static void print_ksym(__u64 addr)
@@ -136,23 +138,34 @@ static inline int generate_load(void)
 
 static void test_perf_event_all_cpu(struct perf_event_attr *attr)
 {
-	int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
-	int *pmu_fd = malloc(nr_cpus * sizeof(int));
-	int i, error = 0;
+	int nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+	struct bpf_link **links = calloc(nr_cpus, sizeof(struct bpf_link *));
+	int i, pmu_fd, error = 0;
+
+	if (!links) {
+		printf("malloc of links failed\n");
+		error = 1;
+		goto err;
+	}
 
 	/* system wide perf event, no need to inherit */
 	attr->inherit = 0;
 
 	/* open perf_event on all cpus */
 	for (i = 0; i < nr_cpus; i++) {
-		pmu_fd[i] = sys_perf_event_open(attr, -1, i, -1, 0);
-		if (pmu_fd[i] < 0) {
+		pmu_fd = sys_perf_event_open(attr, -1, i, -1, 0);
+		if (pmu_fd < 0) {
 			printf("sys_perf_event_open failed\n");
 			error = 1;
 			goto all_cpu_err;
 		}
-		assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
-		assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE) == 0);
+		links[i] = bpf_program__attach_perf_event(prog, pmu_fd);
+		if (IS_ERR(links[i])) {
+			printf("bpf_program__attach_perf_event failed\n");
+			close(pmu_fd);
+			error = 1;
+			goto all_cpu_err;
+		}
 	}
 
 	if (generate_load() < 0) {
@@ -161,18 +174,18 @@ static void test_perf_event_all_cpu(struct perf_event_attr *attr)
 	}
 	print_stacks();
 all_cpu_err:
-	for (i--; i >= 0; i--) {
-		ioctl(pmu_fd[i], PERF_EVENT_IOC_DISABLE);
-		close(pmu_fd[i]);
-	}
-	free(pmu_fd);
+	for (i--; i >= 0; i--)
+		bpf_link__destroy(links[i]);
+err:
+	free(links);
 	if (error)
-		int_exit(0);
+		int_exit(error);
 }
 
 static void test_perf_event_task(struct perf_event_attr *attr)
 {
 	int pmu_fd, error = 0;
+	struct bpf_link *link;
 
 	/* per task perf event, enable inherit so the "dd ..." command can be traced properly.
 	 * Enabling inherit will cause bpf_perf_prog_read_time helper failure.
@@ -185,8 +198,12 @@ static void test_perf_event_task(struct perf_event_attr *attr)
 		printf("sys_perf_event_open failed\n");
 		int_exit(0);
 	}
-	assert(ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
-	assert(ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE) == 0);
+	link = bpf_program__attach_perf_event(prog, pmu_fd);
+	if (IS_ERR(link)) {
+		printf("bpf_program__attach_perf_event failed\n");
+		close(pmu_fd);
+		int_exit(0);
+	}
 
 	if (generate_load() < 0) {
 		error = 1;
@@ -194,10 +211,9 @@ static void test_perf_event_task(struct perf_event_attr *attr)
 	}
 	print_stacks();
 err:
-	ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);
-	close(pmu_fd);
+	bpf_link__destroy(link);
 	if (error)
-		int_exit(0);
+		int_exit(error);
 }
 
 static void test_bpf_perf_event(void)
@@ -282,6 +298,7 @@ static void test_bpf_perf_event(void)
 int main(int argc, char **argv)
 {
 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+	struct bpf_object *obj;
 	char filename[256];
 
 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
@@ -295,9 +312,29 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
-	if (load_bpf_file(filename)) {
-		printf("%s", bpf_log_buf);
-		return 2;
+	obj = bpf_object__open_file(filename, NULL);
+	if (IS_ERR(obj)) {
+		printf("opening BPF object file failed\n");
+		return 1;
+	}
+
+	prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
+	if (!prog) {
+		printf("finding a prog in obj file failed\n");
+		return 1;
+	}
+
+	/* load BPF program */
+	if (bpf_object__load(obj)) {
+		printf("loading BPF object file failed\n");
+		return 1;
+	}
+
+	map_fd[0] = bpf_object__find_map_fd_by_name(obj, "counts");
+	map_fd[1] = bpf_object__find_map_fd_by_name(obj, "stackmap");
+	if (map_fd[0] < 0 || map_fd[1] < 0) {
+		printf("finding a counts/stackmap map in obj file failed\n");
+		return 1;
 	}
 
 	if (fork() == 0) {
-- 
2.25.1