[PATCH for-next 15/16] IB/core: Map iWarp AH type to undefined in rdma_ah_find_type

[Dennis Dalessandro <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

From: Don Hiatt <don.hiatt-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

iWarp devices do not support the creation of address handles
so return AH_ATTR_TYPE_UNDEFINED for all iWarp devices.

While we are here reduce the size of port_num to u8 and add
a comment.

Fixes: 44c58487d51a ("IB/core: Define 'ib' and 'roce' rdma_ah_attr types")
Reported-by: Parav Pandit <parav-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
CC: Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Reviewed-by: Ira Weiny <ira.weiny-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Don Hiatt <don.hiatt-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
 include/rdma/ib_verbs.h |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index f25c036..7d2a7ea 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -881,6 +881,7 @@ enum rdma_ah_attr_type {
 	RDMA_AH_ATTR_TYPE_IB,
 	RDMA_AH_ATTR_TYPE_ROCE,
 	RDMA_AH_ATTR_TYPE_OPA,
+	RDMA_AH_ATTR_TYPE_UNDEFINED,
 };
 
 struct ib_ah_attr {
@@ -3789,13 +3790,19 @@ static inline void rdma_ah_set_grh(struct rdma_ah_attr *attr,
 	grh->traffic_class = traffic_class;
 }
 
-/*Get AH type */
+/**
+ * rdma_ah_find_type - Return address handle type.
+ *
+ * @dev: Device to be checked
+ * @port_num: Port number
+ */
 static inline enum rdma_ah_attr_type rdma_ah_find_type(struct ib_device *dev,
-						       u32 port_num)
+						       u8 port_num)
 {
-	if ((rdma_protocol_roce(dev, port_num)) ||
-	    (rdma_protocol_iwarp(dev, port_num)))
+	if (rdma_protocol_roce(dev, port_num))
 		return RDMA_AH_ATTR_TYPE_ROCE;
+	else if (rdma_protocol_iwarp(dev, port_num))
+		return RDMA_AH_ATTR_TYPE_UNDEFINED;
 	else if ((rdma_protocol_ib(dev, port_num)) &&
 		 (rdma_cap_opa_ah(dev, port_num)))
 		return RDMA_AH_ATTR_TYPE_OPA;

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