@@ -161,6 +161,19 @@
*/
/*
+ * "xdp-headroom" is used to request that extra space is added
+ * for XDP processing. The value is measured in bytes and passed by
+ * the frontend to be consistent between both ends.
+ * If the value is greater than zero that means that
+ * an RX response is going to be passed to an XDP program for processing.
+ * XEN_NETIF_MAX_XDP_HEADROOM defines the maximum headroom offset in bytes
+ *
+ * "feature-xdp-headroom" is set to "1" by the netback side like other features
+ * so a guest can check if an XDP program can be processed.
+ */
+#define XEN_NETIF_MAX_XDP_HEADROOM 0x7FFF
+
+/*
* Control ring
* ============
*
@@ -846,7 +859,8 @@ struct xen_netif_tx_request {
#define XEN_NETIF_EXTRA_TYPE_MCAST_ADD (2) /* u.mcast */
#define XEN_NETIF_EXTRA_TYPE_MCAST_DEL (3) /* u.mcast */
#define XEN_NETIF_EXTRA_TYPE_HASH (4) /* u.hash */
-#define XEN_NETIF_EXTRA_TYPE_MAX (5)
+#define XEN_NETIF_EXTRA_TYPE_XDP (5) /* u.xdp */
+#define XEN_NETIF_EXTRA_TYPE_MAX (6)
/* xen_netif_extra_info_t flags. */
#define _XEN_NETIF_EXTRA_FLAG_MORE (0)
@@ -879,6 +893,10 @@ struct xen_netif_extra_info {
uint8_t algorithm;
uint8_t value[4];
} hash;
+ struct {
+ uint16_t headroom;
+ uint16_t pad[2];
+ } xdp;
uint16_t pad[3];
} u;
};
The patch adds a new extra type to be able to diffirentiate between RX responses on xen-netfront side with the adjusted offset required for XDP processing. The offset value from a guest is passed via xenstore. Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org> --- include/xen/interface/io/netif.h | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-)