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>

2 files changed, 8 insertions, 2 deletions

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_ah.c b/drivers/infiniband/hw/ocrdma/ocrdma_ah.c
index 4aed1dbb0b97..e3c4f1784ce8 100644
--- a/drivers/infiniband/hw/ocrdma/ocrdma_ah.c
+++ b/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);
diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_ah.h b/drivers/infiniband/hw/ocrdma/ocrdma_ah.h
index 04a30ae67473..3856dd4c7e3d 100644
--- a/drivers/infiniband/hw/ocrdma/ocrdma_ah.h
+++ b/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 *);