samples/bpf: Add support for SKB_MODE to xdp1 and xdp_tx_iptunnel
Add option to xdp1 and xdp_tx_iptunnel to insert xdp program in
SKB_MODE:
- update set_link_xdp_fd to take a flags argument that is added to the
RTM_SETLINK message
- Add -S option to xdp1 and xdp_tx_iptunnel user code. When passed in
XDP_FLAGS_SKB_MODE is set in the flags arg passed to set_link_xdp_fd
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/samples/bpf/xdp1_user.c b/samples/bpf/xdp1_user.c
index d2be65d..deb05e6 100644
--- a/samples/bpf/xdp1_user.c
+++ b/samples/bpf/xdp1_user.c
@@ -5,6 +5,7 @@
* License as published by the Free Software Foundation.
*/
#include <linux/bpf.h>
+#include <linux/if_link.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
@@ -12,16 +13,18 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+#include <libgen.h>
#include "bpf_load.h"
#include "bpf_util.h"
#include "libbpf.h"
static int ifindex;
+static int flags;
static void int_exit(int sig)
{
- set_link_xdp_fd(ifindex, -1);
+ set_link_xdp_fd(ifindex, -1, flags);
exit(0);
}
@@ -54,18 +57,39 @@
}
}
-int main(int ac, char **argv)
+static void usage(const char *prog)
{
+ fprintf(stderr,
+ "usage: %s [OPTS] IFINDEX\n\n"
+ "OPTS:\n"
+ " -S use skb-mode\n",
+ prog);
+}
+
+int main(int argc, char **argv)
+{
+ const char *optstr = "S";
char filename[256];
+ int opt;
- snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
-
- if (ac != 2) {
- printf("usage: %s IFINDEX\n", argv[0]);
- return 1;
+ while ((opt = getopt(argc, argv, optstr)) != -1) {
+ switch (opt) {
+ case 'S':
+ flags |= XDP_FLAGS_SKB_MODE;
+ break;
+ default:
+ usage(basename(argv[0]));
+ return 1;
+ }
}
- ifindex = strtoul(argv[1], NULL, 0);
+ if (optind == argc) {
+ usage(basename(argv[0]));
+ return 1;
+ }
+ ifindex = strtoul(argv[optind], NULL, 0);
+
+ snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
if (load_bpf_file(filename)) {
printf("%s", bpf_log_buf);
@@ -79,7 +103,7 @@
signal(SIGINT, int_exit);
- if (set_link_xdp_fd(ifindex, prog_fd[0]) < 0) {
+ if (set_link_xdp_fd(ifindex, prog_fd[0], flags) < 0) {
printf("link set xdp fd failed\n");
return 1;
}