IB/core: Add link layer property to ports

This patch allows ports to have different link layers:
IB_LINK_LAYER_INFINIBAND or IB_LINK_LAYER_ETHERNET.  This is required
for adding IBoE (InfiniBand-over-Ethernet, aka RoCE) support.  For
devices that do not provide an implementation for querying the link
layer property of a port, we return a default value based on the
transport: RMA_TRANSPORT_IB nodes will return IB_LINK_LAYER_INFINIBAND
and RDMA_TRANSPORT_IWARP nodes will return IB_LINK_LAYER_ETHERNET.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 857b3b9cf120..e04c4888d1fd 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -75,6 +75,12 @@ enum rdma_transport_type {
 enum rdma_transport_type
 rdma_node_get_transport(enum rdma_node_type node_type) __attribute_const__;
 
+enum rdma_link_layer {
+        IB_LINK_LAYER_UNSPECIFIED,
+        IB_LINK_LAYER_INFINIBAND,
+        IB_LINK_LAYER_ETHERNET,
+};
+
 enum ib_device_cap_flags {
         IB_DEVICE_RESIZE_MAX_WR         = 1,
         IB_DEVICE_BAD_PKEY_CNTR         = (1<<1),
@@ -1010,6 +1016,8 @@ struct ib_device {
         int                        (*query_port)(struct ib_device *device,
                                                  u8 port_num,
                                                  struct ib_port_attr *port_attr);
+        enum rdma_link_layer       (*get_link_layer)(struct ib_device *device,
+                                                     u8 port_num);
         int                        (*query_gid)(struct ib_device *device,
                                                 u8 port_num, int index,
                                                 union ib_gid *gid);
@@ -1222,6 +1230,9 @@ int ib_query_device(struct ib_device *device,
 int ib_query_port(struct ib_device *device,
                   u8 port_num, struct ib_port_attr *port_attr);
 
+enum rdma_link_layer rdma_port_get_link_layer(struct ib_device *device,
+                                               u8 port_num);
+
 int ib_query_gid(struct ib_device *device,
                  u8 port_num, int index, union ib_gid *gid);