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authorChuck Lever <chuck.lever@oracle.com>2015-03-30 21:34:21 +0300
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2015-03-31 16:52:52 +0300
commita0ce85f595c22d28bf03c3fae8545b3077b7be1b (patch)
tree0b814731f9c21bbb38013c1c0ce48acf4fab1d7f
parent41f97028969e4c88efa5fcf58bc6125210413a6d (diff)
downloadlinux-a0ce85f595c22d28bf03c3fae8545b3077b7be1b.tar.xz
xprtrdma: Add vector of ops for each memory registration strategy
Instead of employing switch() statements, let's use the typical Linux kernel idiom for handling behavioral variation: virtual functions. Start by defining a vector of operations for each supported memory registration mode, and by adding a source file for each mode. 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>
-rw-r--r--net/sunrpc/xprtrdma/Makefile3
-rw-r--r--net/sunrpc/xprtrdma/fmr_ops.c22
-rw-r--r--net/sunrpc/xprtrdma/frwr_ops.c22
-rw-r--r--net/sunrpc/xprtrdma/physical_ops.c24
-rw-r--r--net/sunrpc/xprtrdma/verbs.c11
-rw-r--r--net/sunrpc/xprtrdma/xprt_rdma.h12
6 files changed, 89 insertions, 5 deletions
diff --git a/net/sunrpc/xprtrdma/Makefile b/net/sunrpc/xprtrdma/Makefile
index da5136fd5694..579f72bbcf4b 100644
--- a/net/sunrpc/xprtrdma/Makefile
+++ b/net/sunrpc/xprtrdma/Makefile
@@ -1,6 +1,7 @@
obj-$(CONFIG_SUNRPC_XPRT_RDMA_CLIENT) += xprtrdma.o
-xprtrdma-y := transport.o rpc_rdma.o verbs.o
+xprtrdma-y := transport.o rpc_rdma.o verbs.o \
+ fmr_ops.o frwr_ops.o physical_ops.o
obj-$(CONFIG_SUNRPC_XPRT_RDMA_SERVER) += svcrdma.o
diff --git a/net/sunrpc/xprtrdma/fmr_ops.c b/net/sunrpc/xprtrdma/fmr_ops.c
new file mode 100644
index 000000000000..ffb7d9358480
--- /dev/null
+++ b/net/sunrpc/xprtrdma/fmr_ops.c
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2015 Oracle. All rights reserved.
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ */
+
+/* Lightweight memory registration using Fast Memory Regions (FMR).
+ * Referred to sometimes as MTHCAFMR mode.
+ *
+ * FMR uses synchronous memory registration and deregistration.
+ * FMR registration is known to be fast, but FMR deregistration
+ * can take tens of usecs to complete.
+ */
+
+#include "xprt_rdma.h"
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY RPCDBG_TRANS
+#endif
+
+const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops = {
+ .ro_displayname = "fmr",
+};
diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
new file mode 100644
index 000000000000..79173f98e09a
--- /dev/null
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2015 Oracle. All rights reserved.
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ */
+
+/* Lightweight memory registration using Fast Registration Work
+ * Requests (FRWR). Also referred to sometimes as FRMR mode.
+ *
+ * FRWR features ordered asynchronous registration and deregistration
+ * of arbitrarily sized memory regions. This is the fastest and safest
+ * but most complex memory registration mode.
+ */
+
+#include "xprt_rdma.h"
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY RPCDBG_TRANS
+#endif
+
+const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops = {
+ .ro_displayname = "frwr",
+};
diff --git a/net/sunrpc/xprtrdma/physical_ops.c b/net/sunrpc/xprtrdma/physical_ops.c
new file mode 100644
index 000000000000..b0922accabcf
--- /dev/null
+++ b/net/sunrpc/xprtrdma/physical_ops.c
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2015 Oracle. All rights reserved.
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ */
+
+/* No-op chunk preparation. All client memory is pre-registered.
+ * Sometimes referred to as ALLPHYSICAL mode.
+ *
+ * Physical registration is simple because all client memory is
+ * pre-registered and never deregistered. This mode is good for
+ * adapter bring up, but is considered not safe: the server is
+ * trusted not to abuse its access to client memory not involved
+ * in RDMA I/O.
+ */
+
+#include "xprt_rdma.h"
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY RPCDBG_TRANS
+#endif
+
+const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops = {
+ .ro_displayname = "physical",
+};
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 99752b5b7354..c3319e12551c 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -492,10 +492,10 @@ connected:
int ird = attr->max_dest_rd_atomic;
int tird = ep->rep_remote_cma.responder_resources;
- pr_info("rpcrdma: connection to %pIS:%u on %s, memreg %d slots %d ird %d%s\n",
+ pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n",
sap, rpc_get_port(sap),
ia->ri_id->device->name,
- ia->ri_memreg_strategy,
+ ia->ri_ops->ro_displayname,
xprt->rx_buf.rb_max_requests,
ird, ird < 4 && ird < tird / 2 ? " (low!)" : "");
} else if (connstate < 0) {
@@ -650,13 +650,16 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
*/
switch (memreg) {
case RPCRDMA_FRMR:
+ ia->ri_ops = &rpcrdma_frwr_memreg_ops;
break;
case RPCRDMA_ALLPHYSICAL:
+ ia->ri_ops = &rpcrdma_physical_memreg_ops;
mem_priv = IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_WRITE |
IB_ACCESS_REMOTE_READ;
goto register_setup;
case RPCRDMA_MTHCAFMR:
+ ia->ri_ops = &rpcrdma_fmr_memreg_ops;
if (ia->ri_have_dma_lkey)
break;
mem_priv = IB_ACCESS_LOCAL_WRITE;
@@ -676,8 +679,8 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
rc = -ENOMEM;
goto out3;
}
- dprintk("RPC: %s: memory registration strategy is %d\n",
- __func__, memreg);
+ dprintk("RPC: %s: memory registration strategy is '%s'\n",
+ __func__, ia->ri_ops->ro_displayname);
/* Else will do memory reg/dereg for each chunk */
ia->ri_memreg_strategy = memreg;
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index c8afd83e8b75..ef3cf4aeecd6 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -60,6 +60,7 @@
* Interface Adapter -- one per transport instance
*/
struct rpcrdma_ia {
+ const struct rpcrdma_memreg_ops *ri_ops;
rwlock_t ri_qplock;
struct rdma_cm_id *ri_id;
struct ib_pd *ri_pd;
@@ -331,6 +332,17 @@ struct rpcrdma_stats {
};
/*
+ * Per-registration mode operations
+ */
+struct rpcrdma_memreg_ops {
+ const char *ro_displayname;
+};
+
+extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops;
+extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops;
+extern const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops;
+
+/*
* RPCRDMA transport -- encapsulates the structures above for
* integration with RPC.
*