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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_tx_iptunnel_user.c
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@@ -25,7 +25,7 @@
#define STATS_INTERVAL_S 2U
static int ifindex = -1;
static __u32 xdp_flags = 0;
static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
static int rxcnt_map_fd;
static void int_exit(int sig)
@@ -83,6 +83,7 @@ static void usage(const char *cmd)
printf(" -P <IP-Protocol> Default is TCP\n");
printf(" -S use skb-mode\n");
printf(" -N enforce native mode\n");
printf(" -F Force loading the XDP prog\n");
printf(" -h Display this help\n");
}
@@ -145,7 +146,7 @@ int main(int argc, char **argv)
};
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
int min_port = 0, max_port = 0, vip2tnl_map_fd;
const char *optstr = "i:a:p:s:d:m:T:P:SNh";
const char *optstr = "i:a:p:s:d:m:T:P:FSNh";
unsigned char opt_flags[256] = {};
unsigned int kill_after_s = 0;
struct iptnl_info tnl = {};
@@ -217,6 +218,9 @@ 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;