[PATCH rdma-next V2 23/27] RDMA/netlink: Advertise IB subnet prefix

[Leon Romanovsky]

From: Leon Romanovsky <leo...@mellanox.com>

Add IB subnet prefix to the port properties exported
by RDMA netlink.

Signed-off-by: Leon Romanovsky <leo...@mellanox.com>
---
 drivers/infiniband/core/nldev.c  | 5 +++++
 include/uapi/rdma/rdma_netlink.h | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index fde0138fff5f..c4884841e2fe 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -44,6 +44,7 @@ static const struct nla_policy 
nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
                                            .len = IB_FW_VERSION_NAME_MAX - 1},
        [RDMA_NLDEV_ATTR_NODE_GUID]     = { .type = NLA_U64 },
        [RDMA_NLDEV_ATTR_SYS_IMAGE_GUID] = { .type = NLA_U64 },
+       [RDMA_NLDEV_ATTR_SUBNET_PREFIX] = { .type = NLA_U64 },
 };
 
 static int fill_dev_info(struct sk_buff *msg, struct ib_device *device)
@@ -97,6 +98,10 @@ static int fill_port_info(struct sk_buff *msg,
        if (nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_CAP_FLAGS,
                              (u64)attr.port_cap_flags, 0))
                return -EMSGSIZE;
+       if (rdma_protocol_ib(device, port) &&
+           nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_SUBNET_PREFIX,
+                             attr.subnet_prefix, 0))
+               return -EMSGSIZE;
 
        return 0;
 }
diff --git a/include/uapi/rdma/rdma_netlink.h b/include/uapi/rdma/rdma_netlink.h
index b34f7745daf0..24712d810dca 100644
--- a/include/uapi/rdma/rdma_netlink.h
+++ b/include/uapi/rdma/rdma_netlink.h
@@ -279,6 +279,11 @@ enum rdma_nldev_attr {
         */
        RDMA_NLDEV_ATTR_SYS_IMAGE_GUID,         /* u64 */
 
+       /*
+        * Subnet prefix (in host byte order)
+        */
+       RDMA_NLDEV_ATTR_SUBNET_PREFIX,          /* u64 */
+
        RDMA_NLDEV_ATTR_MAX
 };
 #endif /* _UAPI_RDMA_NETLINK_H */
-- 
2.13.2