RDMA/cxgb3: Set active_mtu in ib_port_attr

When running ibv_devinfo, the active_mtu returned is garbage.  This is
due to the field not being populated in the query_port function in the
driver.  The patch below populates the active_mtu field with a MTU of
2k.  It also zeros the struct, so that any new additions to it will
return 0.

Signed-off-by: Jon Mason <jon@opengridcomputing.com>
Acked-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/cxgb3/iwch_provider.c

@@ -1155,13 +1155,11 @@ static int iwch_query_port(struct ib_device *ibdev,
 			   u8 port, struct ib_port_attr *props)
 {
 	PDBG("%s ibdev %p\n", __func__, ibdev);
+
+	memset(props, 0, sizeof(struct ib_port_attr));
 	props->max_mtu = IB_MTU_4096;
-	props->lid = 0;
-	props->lmc = 0;
-	props->sm_lid = 0;
-	props->sm_sl = 0;
+	props->active_mtu = IB_MTU_2048;
 	props->state = IB_PORT_ACTIVE;
-	props->phys_state = 0;
 	props->port_cap_flags =
 	    IB_PORT_CM_SUP |
 	    IB_PORT_SNMP_TUNNEL_SUP |
@@ -1170,7 +1168,6 @@ static int iwch_query_port(struct ib_device *ibdev,
 	    IB_PORT_VENDOR_CLASS_SUP | IB_PORT_BOOT_MGMT_SUP;
 	props->gid_tbl_len = 1;
 	props->pkey_tbl_len = 1;
-	props->qkey_viol_cntr = 0;
 	props->active_width = 2;
 	props->active_speed = 2;
 	props->max_msg_sz = -1;