xdp: add HW offload mode flag for installing programs

Add an installation-time flag for requesting that the program
be installed only if it can be offloaded to HW.

Internally new command for ndo_xdp is added, this way we avoid
putting checks into drivers since they all return -EINVAL on
an unknown command.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 6 insertions, 2 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index b194817631de..a838591aad28 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -807,6 +807,7 @@ enum xdp_netdev_command {
          * when it is no longer used.
          */
         XDP_SETUP_PROG,
+        XDP_SETUP_PROG_HW,
         /* Check if a bpf program is set on the device.  The callee should
          * return true if a program is currently attached and running.
          */
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index dd88375a6580..ce777ec88e1e 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -891,9 +891,12 @@ enum {
 #define XDP_FLAGS_UPDATE_IF_NOEXIST     (1U << 0)
 #define XDP_FLAGS_SKB_MODE              (1U << 1)
 #define XDP_FLAGS_DRV_MODE              (1U << 2)
+#define XDP_FLAGS_HW_MODE               (1U << 3)
+#define XDP_FLAGS_MODES                 (XDP_FLAGS_SKB_MODE | \
+                                         XDP_FLAGS_DRV_MODE | \
+                                         XDP_FLAGS_HW_MODE)
 #define XDP_FLAGS_MASK                  (XDP_FLAGS_UPDATE_IF_NOEXIST | \
-                                         XDP_FLAGS_SKB_MODE | \
-                                         XDP_FLAGS_DRV_MODE)
+                                         XDP_FLAGS_MODES)
 
 /* These are stored into IFLA_XDP_ATTACHED on dump. */
 enum {