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samples: bpf: convert xdp_fwd_user.c to libbpf 

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

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2018-07-26 14:32:20 -07:00 committed by Daniel Borkmann
parent 6d4b198b0b
commit e1a40ef418
2 changed files with 24 additions and 12 deletions
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2
samples/bpf/Makefile
View File

@ -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)

34
samples/bpf/xdp_fwd_user.c
View File

@ -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;
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;
}
if (!prog_fd[prog_id]) {
printf("load_bpf_file: %s\n", strerror(errno));
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;
}