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authorMaciej Fijalkowski <maciejromanfijalkowski@gmail.com>2019-02-01 22:42:28 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2019-02-01 23:37:51 +0100
commit743e568c15860d4061202f73214c106a5bb0890b (patch)
treef9970c7cb340abbc687848b8e5cfeb7db8da22bf /samples/bpf/xdp_adjust_tail_user.c
parent01dde20ce04b3a18f1e91d6d1ee0ef484d20bbf2 (diff)
downloadlinux-stericsson-743e568c15860d4061202f73214c106a5bb0890b.tar.gz
samples/bpf: Add a "force" flag to XDP samples
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>
Diffstat (limited to 'samples/bpf/xdp_adjust_tail_user.c')
-rw-r--r--samples/bpf/xdp_adjust_tail_user.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/samples/bpf/xdp_adjust_tail_user.c b/samples/bpf/xdp_adjust_tail_user.c
index 3042ce37dae8..049bddf7778b 100644
--- a/samples/bpf/xdp_adjust_tail_user.c
+++ b/samples/bpf/xdp_adjust_tail_user.c
@@ -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;