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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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8
samples/bpf/xdp_adjust_tail_user.c
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@@ -24,7 +24,7 @@
#define STATS_INTERVAL_S 2U
static int ifindex = -1;
static __u32 xdp_flags;
static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
static void int_exit(int sig)
{
@@ -60,6 +60,7 @@ static void usage(const char *cmd)
printf(" -T <stop-after-X-seconds> Default: 0 (forever)\n");
printf(" -S use skb-mode\n");
printf(" -N enforce native mode\n");
printf(" -F force loading prog\n");
printf(" -h Display this help\n");
}
@@ -70,8 +71,8 @@ int main(int argc, char **argv)
.prog_type = BPF_PROG_TYPE_XDP,
};
unsigned char opt_flags[256] = {};
const char *optstr = "i:T:SNFh";
unsigned int kill_after_s = 0;
const char *optstr = "i:T:SNh";
int i, prog_fd, map_fd, opt;
struct bpf_object *obj;
struct bpf_map *map;
@@ -96,6 +97,9 @@ int main(int argc, char **argv)
case 'N':
xdp_flags |= XDP_FLAGS_DRV_MODE;
break;
case 'F':
xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
break;
default:
usage(argv[0]);
return 1;