xdp: add flag to enforce driver mode

After commit b5cdae3291f7 ("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: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 8e56ac70e0d1..549ac8a98b44 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -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,