RDMA/ocrdma: Support user AH creation for RoCE-v2

This patch adds support to create RoCE-v2 compatible AH. It uses ahid
field to tell network-header-type to user space library. The library
has to decode network-header-type from ahid field.

Signed-off-by: Somnath Kotur <somnath.kotur@avagotech.com>
Signed-off-by: Devesh Sharma <devesh.sharma@avagotech.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/ocrdma/ocrdma_ah.c

@@ -218,6 +218,11 @@ struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct ib_ah_attr *attr)
 		ahid_addr = pd->uctx->ah_tbl.va + attr->dlid;
 		*ahid_addr = 0;
 		*ahid_addr |= ah->id & OCRDMA_AH_ID_MASK;
+		if (ocrdma_is_udp_encap_supported(dev)) {
+			*ahid_addr |= ((u32)ah->hdr_type &
+				       OCRDMA_AH_L3_TYPE_MASK) <<
+				       OCRDMA_AH_L3_TYPE_SHIFT;
+		}
 		if (isvlan)
 			*ahid_addr |= (OCRDMA_AH_VLAN_VALID_MASK <<
 				       OCRDMA_AH_VLAN_VALID_SHIFT);

drivers/infiniband/hw/ocrdma/ocrdma_ah.h

@@ -46,9 +46,10 @@
 enum {
 	OCRDMA_AH_ID_MASK		= 0x3FF,
 	OCRDMA_AH_VLAN_VALID_MASK	= 0x01,
-	OCRDMA_AH_VLAN_VALID_SHIFT	= 0x1F
+	OCRDMA_AH_VLAN_VALID_SHIFT	= 0x1F,
+	OCRDMA_AH_L3_TYPE_MASK		= 0x03,
+	OCRDMA_AH_L3_TYPE_SHIFT		= 0x1D /* 29 bits */
 };
-
 struct ib_ah *ocrdma_create_ah(struct ib_pd *, struct ib_ah_attr *);
 int ocrdma_destroy_ah(struct ib_ah *);
 int ocrdma_query_ah(struct ib_ah *, struct ib_ah_attr *);