netdev - [PATCH bpf-next 4/4] samples: bpf: convert xdpsock

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Date:   Thu, 26 Jul 2018 14:32:21 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     alexei.starovoitov@...il.com, daniel@...earbox.net
Cc:     oss-drivers@...ronome.com, netdev@...r.kernel.org,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Björn Töpel <bjorn.topel@...el.com>
Subject: [PATCH bpf-next 4/4] samples: bpf: convert xdpsock_user.c to libbpf

Convert xdpsock_user.c to use libbpf instead of bpf_load.o.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>
---
CC: Magnus Karlsson <magnus.karlsson@...el.com>
CC: Björn Töpel <bjorn.topel@...el.com>

 samples/bpf/Makefile       |  2 +-
 samples/bpf/xdpsock_user.c | 38 +++++++++++++++++++++++++++++---------
 2 files changed, 30 insertions(+), 10 deletions(-)

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 405fa6c880bb..6bfa250fc76e 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -105,7 +105,7 @@ xdp_rxq_info-objs := xdp_rxq_info_user.o
 syscall_tp-objs := bpf_load.o syscall_tp_user.o
 cpustat-objs := bpf_load.o cpustat_user.o
 xdp_adjust_tail-objs := xdp_adjust_tail_user.o
-xdpsock-objs := bpf_load.o xdpsock_user.o
+xdpsock-objs := xdpsock_user.o
 xdp_fwd-objs := xdp_fwd_user.o
 task_fd_query-objs := bpf_load.o task_fd_query_user.o $(TRACE_HELPERS)
 xdp_sample_pkts-objs := xdp_sample_pkts_user.o $(TRACE_HELPERS)
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index 5904b1543831..5c1fcb1a84f1 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -26,7 +26,7 @@
 #include <sys/types.h>
 #include <poll.h>
 
-#include "bpf_load.h"
+#include "bpf/libbpf.h"
 #include "bpf_util.h"
 #include <bpf/bpf.h>
 
@@ -886,7 +886,13 @@ static void l2fwd(struct xdpsock *xsk)
 int main(int argc, char **argv)
 {
 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+	struct bpf_prog_load_attr prog_load_attr = {
+		.prog_type	= BPF_PROG_TYPE_XDP,
+	};
+	int prog_fd, qidconf_map, xsks_map;
+	struct bpf_object *obj;
 	char xdp_filename[256];
+	struct bpf_map *map;
 	int i, ret, key = 0;
 	pthread_t pt;
 
@@ -899,24 +905,38 @@ int main(int argc, char **argv)
 	}
 
 	snprintf(xdp_filename, sizeof(xdp_filename), "%s_kern.o", argv[0]);
+	prog_load_attr.file = xdp_filename;
 
-	if (load_bpf_file(xdp_filename)) {
-		fprintf(stderr, "ERROR: load_bpf_file %s\n", bpf_log_buf);
+	if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
+		exit(EXIT_FAILURE);
+	if (prog_fd < 0) {
+		fprintf(stderr, "ERROR: no program found: %s\n",
+			strerror(prog_fd));
 		exit(EXIT_FAILURE);
 	}
 
-	if (!prog_fd[0]) {
-		fprintf(stderr, "ERROR: load_bpf_file: \"%s\"\n",
-			strerror(errno));
+	map = bpf_object__find_map_by_name(obj, "qidconf_map");
+	qidconf_map = bpf_map__fd(map);
+	if (qidconf_map < 0) {
+		fprintf(stderr, "ERROR: no qidconf map found: %s\n",
+			strerror(qidconf_map));
+		exit(EXIT_FAILURE);
+	}
+
+	map = bpf_object__find_map_by_name(obj, "xsks_map");
+	xsks_map = bpf_map__fd(map);
+	if (xsks_map < 0) {
+		fprintf(stderr, "ERROR: no xsks map found: %s\n",
+			strerror(xsks_map));
 		exit(EXIT_FAILURE);
 	}
 
-	if (bpf_set_link_xdp_fd(opt_ifindex, prog_fd[0], opt_xdp_flags) < 0) {
+	if (bpf_set_link_xdp_fd(opt_ifindex, prog_fd, opt_xdp_flags) < 0) {
 		fprintf(stderr, "ERROR: link set xdp fd failed\n");
 		exit(EXIT_FAILURE);
 	}
 
-	ret = bpf_map_update_elem(map_fd[0], &key, &opt_queue, 0);
+	ret = bpf_map_update_elem(qidconf_map, &key, &opt_queue, 0);
 	if (ret) {
 		fprintf(stderr, "ERROR: bpf_map_update_elem qidconf\n");
 		exit(EXIT_FAILURE);
@@ -933,7 +953,7 @@ int main(int argc, char **argv)
 	/* ...and insert them into the map. */
 	for (i = 0; i < num_socks; i++) {
 		key = i;
-		ret = bpf_map_update_elem(map_fd[1], &key, &xsks[i]->sfd, 0);
+		ret = bpf_map_update_elem(xsks_map, &key, &xsks[i]->sfd, 0);
 		if (ret) {
 			fprintf(stderr, "ERROR: bpf_map_update_elem %d\n", i);
 			exit(EXIT_FAILURE);
-- 
2.17.1