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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_rxq_info_user.c
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@@ -30,7 +30,7 @@ static int ifindex = -1;
static char ifname_buf[IF_NAMESIZE];
static char *ifname;
static __u32 xdp_flags;
static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
static struct bpf_map *stats_global_map;
static struct bpf_map *rx_queue_index_map;
@@ -52,6 +52,7 @@ static const struct option long_options[] = {
{"action", required_argument, NULL, 'a' },
{"readmem", no_argument, NULL, 'r' },
{"swapmac", no_argument, NULL, 'm' },
{"force", no_argument, NULL, 'F' },
{0, 0, NULL, 0 }
};
@@ -487,7 +488,7 @@ int main(int argc, char **argv)
}
/* Parse commands line args */
while ((opt = getopt_long(argc, argv, "hSd:",
while ((opt = getopt_long(argc, argv, "FhSrmzd:s:a:",
long_options, &longindex)) != -1) {
switch (opt) {
case 'd':
@@ -524,6 +525,9 @@ int main(int argc, char **argv)
case 'm':
cfg_options |= SWAP_MAC;
break;
case 'F':
xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
break;
case 'h':
error:
default: