Commit 0489df9a authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

xdp: add flag to enforce driver mode 



After commit b5cdae32 ("net: Generic XDP") we automatically fall
back to a generic XDP variant if the driver does not support native
XDP. Allow for an option where the user can specify that always the
native XDP variant should be selected and in case it's not supported
by a driver, just bail out.

Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0a5539f6

include/uapi/linux/if_link.h

+4 −2
Original line number Diff line number Diff line
@@ -888,9 +888,11 @@ enum { 
/* XDP section */



#define XDP_FLAGS_UPDATE_IF_NOEXIST	(1U << 0)

#define XDP_FLAGS_SKB_MODE		(2U << 0)

#define XDP_FLAGS_SKB_MODE		(1U << 1)

#define XDP_FLAGS_DRV_MODE		(1U << 2)

#define XDP_FLAGS_MASK			(XDP_FLAGS_UPDATE_IF_NOEXIST | \

					 XDP_FLAGS_SKB_MODE)

					 XDP_FLAGS_SKB_MODE | \

					 XDP_FLAGS_DRV_MODE)



enum {

	IFLA_XDP_UNSPEC,

net/core/dev.c

+2 −0
Original line number Diff line number Diff line
@@ -6873,6 +6873,8 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, 
	ASSERT_RTNL();



	xdp_op = ops->ndo_xdp;

	if (!xdp_op && (flags & XDP_FLAGS_DRV_MODE))

		return -EOPNOTSUPP;

	if (!xdp_op || (flags & XDP_FLAGS_SKB_MODE))

		xdp_op = generic_xdp_install;

net/core/rtnetlink.c

+5 −0
Original line number Diff line number Diff line
@@ -2199,6 +2199,11 @@ static int do_setlink(const struct sk_buff *skb, 
				err = -EINVAL;

				goto errout;

			}

			if ((xdp_flags & XDP_FLAGS_SKB_MODE) &&

			    (xdp_flags & XDP_FLAGS_DRV_MODE)) {

				err = -EINVAL;

				goto errout;

			}

		}



		if (xdp[IFLA_XDP_FD]) {

samples/bpf/xdp1_user.c

+6 −2
Original line number Diff line number Diff line
@@ -62,13 +62,14 @@ static void usage(const char *prog) 
	fprintf(stderr,

		"usage: %s [OPTS] IFINDEX\n\n"

		"OPTS:\n"

		"    -S    use skb-mode\n",

		"    -S    use skb-mode\n"

		"    -N    enforce native mode\n",

		prog);

}



int main(int argc, char **argv)

{

	const char *optstr = "S";

	const char *optstr = "SN";

	char filename[256];

	int opt;
@@ -77,6 +78,9 @@ int main(int argc, char **argv) 
		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;

samples/bpf/xdp_tx_iptunnel_user.c

+6 −1
Original line number Diff line number Diff line
@@ -79,6 +79,8 @@ static void usage(const char *cmd) 
	printf("    -m <dest-MAC> Used in sending the IP Tunneled pkt\n");

	printf("    -T <stop-after-X-seconds> Default: 0 (forever)\n");

	printf("    -P <IP-Protocol> Default is TCP\n");

	printf("    -S use skb-mode\n");

	printf("    -N enforce native mode\n");

	printf("    -h Display this help\n");

}
@@ -138,7 +140,7 @@ int main(int argc, char **argv) 
{

	unsigned char opt_flags[256] = {};

	unsigned int kill_after_s = 0;

	const char *optstr = "i:a:p:s:d:m:T:P:Sh";

	const char *optstr = "i:a:p:s:d:m:T:P:SNh";

	int min_port = 0, max_port = 0;

	struct iptnl_info tnl = {};

	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
@@ -206,6 +208,9 @@ int main(int argc, char **argv) 
		case 'S':

			xdp_flags |= XDP_FLAGS_SKB_MODE;

			break;

		case 'N':

			xdp_flags |= XDP_FLAGS_DRV_MODE;

			break;

		default:

			usage(argv[0]);

			return 1;

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