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samples/bpf: Add a "force" flag to XDP samples

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Make xdp samples consistent with iproute2 behavior and set the
XDP_FLAGS_UPDATE_IF_NOEXIST by default when setting the xdp program on
interface. Provide an option for user to force the program loading,
which as a result will not include the mentioned flag in
bpf_set_link_xdp_fd call.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Maciej Fijalkowski
2019-02-01 22:42:28 +01:00
committed by Daniel Borkmann
parent 01dde20ce0
commit 743e568c15
10 changed files with 119 additions and 40 deletions
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50
samples/bpf/xdp_router_ipv4_user.c
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@@ -26,8 +26,9 @@
#include "bpf_util.h"
#include "bpf/libbpf.h"
#include <sys/resource.h>
#include <libgen.h>
int sock, sock_arp, flags = 0;
int sock, sock_arp, flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
static int total_ifindex;
int *ifindex_list;
char buf[8192];
@@ -608,33 +609,56 @@ cleanup:
return ret;
}
static void usage(const char *prog)
{
fprintf(stderr,
"%s: %s [OPTS] interface name list\n\n"
"OPTS:\n"
" -S use skb-mode\n"
" -F force loading prog\n",
__func__, prog);
}
int main(int ac, char **argv)
{
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
struct bpf_prog_load_attr prog_load_attr = {
.prog_type = BPF_PROG_TYPE_XDP,
};
const char *optstr = "SF";
struct bpf_object *obj;
char filename[256];
char **ifname_list;
int prog_fd;
int prog_fd, opt;
int i = 1;
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
prog_load_attr.file = filename;
if (ac < 2) {
printf("usage: %s [-S] Interface name list\n", argv[0]);
return 1;
total_ifindex = ac - 1;
ifname_list = (argv + 1);
while ((opt = getopt(ac, argv, optstr)) != -1) {
switch (opt) {
case 'S':
flags |= XDP_FLAGS_SKB_MODE;
total_ifindex--;
ifname_list++;
break;
case 'F':
flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
total_ifindex--;
ifname_list++;
break;
default:
usage(basename(argv[0]));
return 1;
}
}
if (!strcmp(argv[1], "-S")) {
flags = XDP_FLAGS_SKB_MODE;
total_ifindex = ac - 2;
ifname_list = (argv + 2);
} else {
flags = 0;
total_ifindex = ac - 1;
ifname_list = (argv + 1);
if (optind == ac) {
usage(basename(argv[0]));
return 1;
}
if (setrlimit(RLIMIT_MEMLOCK, &r)) {