RDMA/cxgb3: Add support for protocol statistics

- Add a new rdma ctl command called RDMA_GET_MIB to the cxgb3 low
  level driver to obtain the protocol mib from the rnic hardware.

- Add new iw_cxgb3 provider method to get the MIB from the low level
  driver.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/net/cxgb3/cxgb3_offload.c b/drivers/net/cxgb3/cxgb3_offload.c
index ff9c013..cf26968 100644
--- a/drivers/net/cxgb3/cxgb3_offload.c
+++ b/drivers/net/cxgb3/cxgb3_offload.c
@@ -303,6 +303,12 @@
 		spin_unlock_irq(&adapter->sge.reg_lock);
 		break;
 	}
+	case RDMA_GET_MIB: {
+		spin_lock(&adapter->stats_lock);
+		t3_tp_get_mib_stats(adapter, (struct tp_mib_stats *)data);
+		spin_unlock(&adapter->stats_lock);
+		break;
+	}
 	default:
 		ret = -EOPNOTSUPP;
 	}
@@ -381,6 +387,7 @@
 	case RDMA_CQ_DISABLE:
 	case RDMA_CTRL_QP_SETUP:
 	case RDMA_GET_MEM:
+	case RDMA_GET_MIB:
 		if (!offload_running(adapter))
 			return -EAGAIN;
 		return cxgb_rdma_ctl(adapter, req, data);