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samples/bpf: add option for native and skb mode for redirect apps
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When testing with a driver that has both native and generic redirect support:

$ sudo ./samples/bpf/xdp_redirect -N 5 6
input: 5 output: 6
ifindex 6:    4961879 pkt/s
ifindex 6:    6391319 pkt/s
ifindex 6:    6419468 pkt/s

$ sudo ./samples/bpf/xdp_redirect -S 5 6
input: 5 output: 6
ifindex 6:    1845435 pkt/s
ifindex 6:    3882850 pkt/s
ifindex 6:    3893974 pkt/s

$ sudo ./samples/bpf/xdp_redirect_map -N 5 6
input: 5 output: 6
map[0] (vports) = 4, map[1] (map) = 5, map[2] (count) = 0
ifindex 6:    2207374 pkt/s
ifindex 6:    6212869 pkt/s
ifindex 6:    6286515 pkt/s

$ sudo ./samples/bpf/xdp_redirect_map -S 5 6
input: 5 output: 6
map[0] (vports) = 4, map[1] (map) = 5, map[2] (count) = 0
ifindex 6:    5052528 pkt/s
ifindex 6:    5736631 pkt/s
ifindex 6:    5739962 pkt/s

Signed-off-by: Andy Gospodarek <andy@greyhouse.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Andy Gospodarek authored and David S. Miller committed Jul 17, 2017
1 parent 7924a42 commit 24251c2
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Showing 2 changed files with 82 additions and 18 deletions.
50 changes: 41 additions & 9 deletions samples/bpf/xdp_redirect_map_user.c
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Original file line number Diff line number Diff line change
Expand Up @@ -10,13 +10,15 @@
* General Public License for more details.
*/
#include <linux/bpf.h>
#include <linux/if_link.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libgen.h>

#include "bpf_load.h"
#include "bpf_util.h"
Expand All @@ -25,9 +27,11 @@
static int ifindex_in;
static int ifindex_out;

static __u32 xdp_flags;

static void int_exit(int sig)
{
set_link_xdp_fd(ifindex_in, -1, 0);
set_link_xdp_fd(ifindex_in, -1, xdp_flags);
exit(0);
}

Expand Down Expand Up @@ -56,20 +60,47 @@ static void poll_stats(int interval, int ifindex)
}
}

int main(int ac, char **argv)
static void usage(const char *prog)
{
char filename[256];
int ret, key = 0;
fprintf(stderr,
"usage: %s [OPTS] IFINDEX_IN IFINDEX_OUT\n\n"
"OPTS:\n"
" -S use skb-mode\n"
" -N enforce native mode\n",
prog);
}

snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);

if (ac != 3) {
int main(int argc, char **argv)
{
const char *optstr = "SN";
char filename[256];
int ret, opt, key = 0;

while ((opt = getopt(argc, argv, optstr)) != -1) {
switch (opt) {
case 'S':
xdp_flags |= XDP_FLAGS_SKB_MODE;
break;
case 'N':
xdp_flags |= XDP_FLAGS_DRV_MODE;
break;
default:
usage(basename(argv[0]));
return 1;
}
}

if (optind == argc) {
printf("usage: %s IFINDEX_IN IFINDEX_OUT\n", argv[0]);
return 1;
}

ifindex_in = strtoul(argv[1], NULL, 0);
ifindex_out = strtoul(argv[2], NULL, 0);
ifindex_in = strtoul(argv[optind], NULL, 0);
ifindex_out = strtoul(argv[optind + 1], NULL, 0);
printf("input: %d output: %d\n", ifindex_in, ifindex_out);

snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);

if (load_bpf_file(filename)) {
printf("%s", bpf_log_buf);
Expand All @@ -82,8 +113,9 @@ int main(int ac, char **argv)
}

signal(SIGINT, int_exit);
signal(SIGTERM, int_exit);

if (set_link_xdp_fd(ifindex_in, prog_fd[0], 0) < 0) {
if (set_link_xdp_fd(ifindex_in, prog_fd[0], xdp_flags) < 0) {
printf("link set xdp fd failed\n");
return 1;
}
Expand Down
50 changes: 41 additions & 9 deletions samples/bpf/xdp_redirect_user.c
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Original file line number Diff line number Diff line change
Expand Up @@ -10,13 +10,15 @@
* General Public License for more details.
*/
#include <linux/bpf.h>
#include <linux/if_link.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libgen.h>

#include "bpf_load.h"
#include "bpf_util.h"
Expand All @@ -25,9 +27,11 @@
static int ifindex_in;
static int ifindex_out;

static __u32 xdp_flags;

static void int_exit(int sig)
{
set_link_xdp_fd(ifindex_in, -1, 0);
set_link_xdp_fd(ifindex_in, -1, xdp_flags);
exit(0);
}

Expand Down Expand Up @@ -56,20 +60,47 @@ static void poll_stats(int interval, int ifindex)
}
}

int main(int ac, char **argv)
static void usage(const char *prog)
{
char filename[256];
int ret, key = 0;
fprintf(stderr,
"usage: %s [OPTS] IFINDEX_IN IFINDEX_OUT\n\n"
"OPTS:\n"
" -S use skb-mode\n"
" -N enforce native mode\n",
prog);
}

snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);

if (ac != 3) {
int main(int argc, char **argv)
{
const char *optstr = "SN";
char filename[256];
int ret, opt, key = 0;

while ((opt = getopt(argc, argv, optstr)) != -1) {
switch (opt) {
case 'S':
xdp_flags |= XDP_FLAGS_SKB_MODE;
break;
case 'N':
xdp_flags |= XDP_FLAGS_DRV_MODE;
break;
default:
usage(basename(argv[0]));
return 1;
}
}

if (optind == argc) {
printf("usage: %s IFINDEX_IN IFINDEX_OUT\n", argv[0]);
return 1;
}

ifindex_in = strtoul(argv[1], NULL, 0);
ifindex_out = strtoul(argv[2], NULL, 0);
ifindex_in = strtoul(argv[optind], NULL, 0);
ifindex_out = strtoul(argv[optind + 1], NULL, 0);
printf("input: %d output: %d\n", ifindex_in, ifindex_out);

snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);

if (load_bpf_file(filename)) {
printf("%s", bpf_log_buf);
Expand All @@ -82,8 +113,9 @@ int main(int ac, char **argv)
}

signal(SIGINT, int_exit);
signal(SIGTERM, int_exit);

if (set_link_xdp_fd(ifindex_in, prog_fd[0], 0) < 0) {
if (set_link_xdp_fd(ifindex_in, prog_fd[0], xdp_flags) < 0) {
printf("link set xdp fd failed\n");
return 1;
}
Expand Down

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