[PATCH bpf-next 4/4] samples: bpf: convert xdpsock_user.c to libbpf

[Jakub Kicinski]

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

Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
Reviewed-by: Quentin Monnet <quentin.mon...@netronome.com>
---
CC: Magnus Karlsson <magnus.karls...@intel.com>
CC: Björn Töpel <bjorn.to...@intel.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