IB/core: rename pd->local_mr to pd->__internal_mr

This has two reasons: a) to clearly mark that drivers don't have any
business using it, and b) because we're going to use it for the
(dangerous) global rkey soon, so that drivers don't create on themselves.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/uverbs_cmd.c

@@ -571,7 +571,7 @@ ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
 
 	pd->device  = ib_dev;
 	pd->uobject = uobj;
-	pd->local_mr = NULL;
+	pd->__internal_mr = NULL;
 	atomic_set(&pd->usecnt, 0);
 
 	uobj->object = pd;

drivers/infiniband/core/verbs.c

@@ -237,7 +237,7 @@ struct ib_pd *ib_alloc_pd(struct ib_device *device)
 
 	pd->device = device;
 	pd->uobject = NULL;
-	pd->local_mr = NULL;
+	pd->__internal_mr = NULL;
 	atomic_set(&pd->usecnt, 0);
 
 	if (device->attrs.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)
@@ -251,8 +251,8 @@ struct ib_pd *ib_alloc_pd(struct ib_device *device)
 			return (struct ib_pd *)mr;
 		}
 
-		pd->local_mr = mr;
-		pd->local_dma_lkey = pd->local_mr->lkey;
+		pd->__internal_mr = mr;
+		pd->local_dma_lkey = pd->__internal_mr->lkey;
 	}
 	return pd;
 }
@@ -270,10 +270,10 @@ void ib_dealloc_pd(struct ib_pd *pd)
 {
 	int ret;
 
-	if (pd->local_mr) {
-		ret = ib_dereg_mr(pd->local_mr);
+	if (pd->__internal_mr) {
+		ret = ib_dereg_mr(pd->__internal_mr);
 		WARN_ON(ret);
-		pd->local_mr = NULL;
+		pd->__internal_mr = NULL;
 	}
 
 	/* uverbs manipulates usecnt with proper locking, while the kabi

include/rdma/ib_verbs.h

@@ -1373,7 +1373,11 @@ struct ib_pd {
 	struct ib_device       *device;
 	struct ib_uobject      *uobject;
 	atomic_t          	usecnt; /* count all resources */
-	struct ib_mr	       *local_mr;
+
+	/*
+	 * Implementation details of the RDMA core, don't use in drivers:
+	 */
+	struct ib_mr	       *__internal_mr;
 };
 
 struct ib_xrcd {