[PATCH bpf-next 3/4] samples: bpf: convert xdp_fwd_user.c to libbpf

[Jakub Kicinski]

Convert xdp_fwd_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: dsah...@gmail.com

 samples/bpf/Makefile       |  2 +-
 samples/bpf/xdp_fwd_user.c | 34 +++++++++++++++++++++++-----------
 2 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 9ea2f7b64869..405fa6c880bb 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -106,7 +106,7 @@ 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
-xdp_fwd-objs := bpf_load.o xdp_fwd_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/xdp_fwd_user.c b/samples/bpf/xdp_fwd_user.c
index a87a2048ed32..f88e1d7093d6 100644
--- a/samples/bpf/xdp_fwd_user.c
+++ b/samples/bpf/xdp_fwd_user.c
@@ -24,8 +24,7 @@
 #include <fcntl.h>
 #include <libgen.h>
 
-#include "bpf_load.h"
-#include "bpf_util.h"
+#include "bpf/libbpf.h"
 #include <bpf/bpf.h>
 
 
@@ -63,9 +62,15 @@ static void usage(const char *prog)
 
 int main(int argc, char **argv)
 {
+       struct bpf_prog_load_attr prog_load_attr = {
+               .prog_type      = BPF_PROG_TYPE_XDP,
+       };
+       const char *prog_name = "xdp_fwd";
+       struct bpf_program *prog;
        char filename[PATH_MAX];
+       struct bpf_object *obj;
        int opt, i, idx, err;
-       int prog_id = 0;
+       int prog_fd, map_fd;
        int attach = 1;
        int ret = 0;
 
@@ -75,7 +80,7 @@ int main(int argc, char **argv)
                        attach = 0;
                        break;
                case 'D':
-                       prog_id = 1;
+                       prog_name = "xdp_fwd_direct";
                        break;
                default:
                        usage(basename(argv[0]));
@@ -90,6 +95,7 @@ int main(int argc, char **argv)
 
        if (attach) {
                snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+               prog_load_attr.file = filename;
 
                if (access(filename, O_RDONLY) < 0) {
                        printf("error accessing file %s: %s\n",
@@ -97,19 +103,25 @@ int main(int argc, char **argv)
                        return 1;
                }
 
-               if (load_bpf_file(filename)) {
-                       printf("%s", bpf_log_buf);
+               if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
                        return 1;
-               }
 
-               if (!prog_fd[prog_id]) {
-                       printf("load_bpf_file: %s\n", strerror(errno));
+               prog = bpf_object__find_program_by_title(obj, prog_name);
+               prog_fd = bpf_program__fd(prog);
+               if (prog_fd < 0) {
+                       printf("program not found: %s\n", strerror(prog_fd));
+                       return 1;
+               }
+               map_fd = bpf_map__fd(bpf_object__find_map_by_name(obj,
+                                                                 "tx_port"));
+               if (map_fd < 0) {
+                       printf("map not found: %s\n", strerror(map_fd));
                        return 1;
                }
        }
        if (attach) {
                for (i = 1; i < 64; ++i)
-                       bpf_map_update_elem(map_fd[0], &i, &i, 0);
+                       bpf_map_update_elem(map_fd, &i, &i, 0);
        }
 
        for (i = optind; i < argc; ++i) {
@@ -126,7 +138,7 @@ int main(int argc, char **argv)
                        if (err)
                                ret = err;
                } else {
-                       err = do_attach(idx, prog_fd[prog_id], argv[i]);
+                       err = do_attach(idx, prog_fd, argv[i]);
                        if (err)
                                ret = err;
                }
-- 
2.17.1