xprtrdma: Add "reset MRs" memreg op

This method is invoked when a transport instance is about to be
reconnected. Each Memory Region object is reset to its initial
state.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Tested-by: Devesh Sharma <Devesh.Sharma@Emulex.Com>
Tested-by: Meghana Cheripady <Meghana.Cheripady@Emulex.Com>
Tested-by: Veeresh U. Kokatnur <veereshuk@chelsio.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/xprtrdma/fmr_ops.c

@@ -146,10 +146,33 @@ fmr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
 	return nsegs;
 }
 
+/* After a disconnect, unmap all FMRs.
+ *
+ * This is invoked only in the transport connect worker in order
+ * to serialize with rpcrdma_register_fmr_external().
+ */
+static void
+fmr_op_reset(struct rpcrdma_xprt *r_xprt)
+{
+	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
+	struct rpcrdma_mw *r;
+	LIST_HEAD(list);
+	int rc;
+
+	list_for_each_entry(r, &buf->rb_all, mw_all)
+		list_add(&r->r.fmr->list, &list);
+
+	rc = ib_unmap_fmr(&list);
+	if (rc)
+		dprintk("RPC:       %s: ib_unmap_fmr failed %i\n",
+			__func__, rc);
+}
+
 const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops = {
 	.ro_map				= fmr_op_map,
 	.ro_unmap			= fmr_op_unmap,
 	.ro_maxpages			= fmr_op_maxpages,
 	.ro_init			= fmr_op_init,
+	.ro_reset			= fmr_op_reset,
 	.ro_displayname			= "fmr",
 };

net/sunrpc/xprtrdma/frwr_ops.c

@@ -46,6 +46,18 @@ __frwr_init(struct rpcrdma_mw *r, struct ib_pd *pd, struct ib_device *device,
 	return rc;
 }
 
+static void
+__frwr_release(struct rpcrdma_mw *r)
+{
+	int rc;
+
+	rc = ib_dereg_mr(r->r.frmr.fr_mr);
+	if (rc)
+		dprintk("RPC:       %s: ib_dereg_mr status %i\n",
+			__func__, rc);
+	ib_free_fast_reg_page_list(r->r.frmr.fr_pgl);
+}
+
 /* FRWR mode conveys a list of pages per chunk segment. The
  * maximum length of that list is the FRWR page list depth.
  */
@@ -210,10 +222,49 @@ frwr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
 	return nsegs;
 }
 
+/* After a disconnect, a flushed FAST_REG_MR can leave an FRMR in
+ * an unusable state. Find FRMRs in this state and dereg / reg
+ * each.  FRMRs that are VALID and attached to an rpcrdma_req are
+ * also torn down.
+ *
+ * This gives all in-use FRMRs a fresh rkey and leaves them INVALID.
+ *
+ * This is invoked only in the transport connect worker in order
+ * to serialize with rpcrdma_register_frmr_external().
+ */
+static void
+frwr_op_reset(struct rpcrdma_xprt *r_xprt)
+{
+	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
+	struct ib_device *device = r_xprt->rx_ia.ri_id->device;
+	unsigned int depth = r_xprt->rx_ia.ri_max_frmr_depth;
+	struct ib_pd *pd = r_xprt->rx_ia.ri_pd;
+	struct rpcrdma_mw *r;
+	int rc;
+
+	list_for_each_entry(r, &buf->rb_all, mw_all) {
+		if (r->r.frmr.fr_state == FRMR_IS_INVALID)
+			continue;
+
+		__frwr_release(r);
+		rc = __frwr_init(r, pd, device, depth);
+		if (rc) {
+			dprintk("RPC:       %s: mw %p left %s\n",
+				__func__, r,
+				(r->r.frmr.fr_state == FRMR_IS_STALE ?
+					"stale" : "valid"));
+			continue;
+		}
+
+		r->r.frmr.fr_state = FRMR_IS_INVALID;
+	}
+}
+
 const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops = {
 	.ro_map				= frwr_op_map,
 	.ro_unmap			= frwr_op_unmap,
 	.ro_maxpages			= frwr_op_maxpages,
 	.ro_init			= frwr_op_init,
+	.ro_reset			= frwr_op_reset,
 	.ro_displayname			= "frwr",
 };

net/sunrpc/xprtrdma/physical_ops.c

@@ -59,10 +59,16 @@ physical_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
 	return 1;
 }
 
+static void
+physical_op_reset(struct rpcrdma_xprt *r_xprt)
+{
+}
+
 const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops = {
 	.ro_map				= physical_op_map,
 	.ro_unmap			= physical_op_unmap,
 	.ro_maxpages			= physical_op_maxpages,
 	.ro_init			= physical_op_init,
+	.ro_reset			= physical_op_reset,
 	.ro_displayname			= "physical",
 };

net/sunrpc/xprtrdma/verbs.c

@@ -63,9 +63,6 @@
 # define RPCDBG_FACILITY	RPCDBG_TRANS
 #endif
 
-static void rpcrdma_reset_frmrs(struct rpcrdma_ia *);
-static void rpcrdma_reset_fmrs(struct rpcrdma_ia *);
-
 /*
  * internal functions
  */
@@ -945,21 +942,9 @@ rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
 		rpcrdma_ep_disconnect(ep, ia);
 		rpcrdma_flush_cqs(ep);
 
-		switch (ia->ri_memreg_strategy) {
-		case RPCRDMA_FRMR:
-			rpcrdma_reset_frmrs(ia);
-			break;
-		case RPCRDMA_MTHCAFMR:
-			rpcrdma_reset_fmrs(ia);
-			break;
-		case RPCRDMA_ALLPHYSICAL:
-			break;
-		default:
-			rc = -EIO;
-			goto out;
-		}
-
 		xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
+		ia->ri_ops->ro_reset(xprt);
+
 		id = rpcrdma_create_id(xprt, ia,
 				(struct sockaddr *)&xprt->rx_data.addr);
 		if (IS_ERR(id)) {
@@ -1289,90 +1274,6 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
 	kfree(buf->rb_pool);
 }
 
-/* After a disconnect, unmap all FMRs.
- *
- * This is invoked only in the transport connect worker in order
- * to serialize with rpcrdma_register_fmr_external().
- */
-static void
-rpcrdma_reset_fmrs(struct rpcrdma_ia *ia)
-{
-	struct rpcrdma_xprt *r_xprt =
-				container_of(ia, struct rpcrdma_xprt, rx_ia);
-	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
-	struct list_head *pos;
-	struct rpcrdma_mw *r;
-	LIST_HEAD(l);
-	int rc;
-
-	list_for_each(pos, &buf->rb_all) {
-		r = list_entry(pos, struct rpcrdma_mw, mw_all);
-
-		INIT_LIST_HEAD(&l);
-		list_add(&r->r.fmr->list, &l);
-		rc = ib_unmap_fmr(&l);
-		if (rc)
-			dprintk("RPC:       %s: ib_unmap_fmr failed %i\n",
-				__func__, rc);
-	}
-}
-
-/* After a disconnect, a flushed FAST_REG_MR can leave an FRMR in
- * an unusable state. Find FRMRs in this state and dereg / reg
- * each.  FRMRs that are VALID and attached to an rpcrdma_req are
- * also torn down.
- *
- * This gives all in-use FRMRs a fresh rkey and leaves them INVALID.
- *
- * This is invoked only in the transport connect worker in order
- * to serialize with rpcrdma_register_frmr_external().
- */
-static void
-rpcrdma_reset_frmrs(struct rpcrdma_ia *ia)
-{
-	struct rpcrdma_xprt *r_xprt =
-				container_of(ia, struct rpcrdma_xprt, rx_ia);
-	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
-	struct list_head *pos;
-	struct rpcrdma_mw *r;
-	int rc;
-
-	list_for_each(pos, &buf->rb_all) {
-		r = list_entry(pos, struct rpcrdma_mw, mw_all);
-
-		if (r->r.frmr.fr_state == FRMR_IS_INVALID)
-			continue;
-
-		rc = ib_dereg_mr(r->r.frmr.fr_mr);
-		if (rc)
-			dprintk("RPC:       %s: ib_dereg_mr failed %i\n",
-				__func__, rc);
-		ib_free_fast_reg_page_list(r->r.frmr.fr_pgl);
-
-		r->r.frmr.fr_mr = ib_alloc_fast_reg_mr(ia->ri_pd,
-					ia->ri_max_frmr_depth);
-		if (IS_ERR(r->r.frmr.fr_mr)) {
-			rc = PTR_ERR(r->r.frmr.fr_mr);
-			dprintk("RPC:       %s: ib_alloc_fast_reg_mr"
-				" failed %i\n", __func__, rc);
-			continue;
-		}
-		r->r.frmr.fr_pgl = ib_alloc_fast_reg_page_list(
-					ia->ri_id->device,
-					ia->ri_max_frmr_depth);
-		if (IS_ERR(r->r.frmr.fr_pgl)) {
-			rc = PTR_ERR(r->r.frmr.fr_pgl);
-			dprintk("RPC:       %s: "
-				"ib_alloc_fast_reg_page_list "
-				"failed %i\n", __func__, rc);
-
-			ib_dereg_mr(r->r.frmr.fr_mr);
-			continue;
-		}
-		r->r.frmr.fr_state = FRMR_IS_INVALID;
-	}
-}
-
 /* "*mw" can be NULL when rpcrdma_buffer_get_mrs() fails, leaving
  * some req segments uninitialized.
  */

net/sunrpc/xprtrdma/xprt_rdma.h

@@ -342,6 +342,7 @@ struct rpcrdma_memreg_ops {
 				    struct rpcrdma_mr_seg *);
 	size_t		(*ro_maxpages)(struct rpcrdma_xprt *);
 	int		(*ro_init)(struct rpcrdma_xprt *);
+	void		(*ro_reset)(struct rpcrdma_xprt *);
 	const char	*ro_displayname;
 };