Return-Path: Received: from mail-ie0-f171.google.com ([209.85.223.171]:35911 "EHLO mail-ie0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751754AbbCXUb1 (ORCPT ); Tue, 24 Mar 2015 16:31:27 -0400 Subject: [PATCH v2 06/15] xprtrdma: Add vector of ops for each memory registration strategy From: Chuck Lever To: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Tue, 24 Mar 2015 16:31:24 -0400 Message-ID: <20150324203124.2311.39720.stgit@manet.1015granger.net> In-Reply-To: <20150324201849.2311.53599.stgit@manet.1015granger.net> References: <20150324201849.2311.53599.stgit@manet.1015granger.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: 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 Reviewed-by: Sagi Grimberg --- net/sunrpc/xprtrdma/Makefile | 3 ++- net/sunrpc/xprtrdma/fmr_ops.c | 22 ++++++++++++++++++++++ net/sunrpc/xprtrdma/frwr_ops.c | 22 ++++++++++++++++++++++ net/sunrpc/xprtrdma/physical_ops.c | 24 ++++++++++++++++++++++++ net/sunrpc/xprtrdma/verbs.c | 11 +++++++---- net/sunrpc/xprtrdma/xprt_rdma.h | 12 ++++++++++++ 6 files changed, 89 insertions(+), 5 deletions(-) create mode 100644 net/sunrpc/xprtrdma/fmr_ops.c create mode 100644 net/sunrpc/xprtrdma/frwr_ops.c create mode 100644 net/sunrpc/xprtrdma/physical_ops.c diff --git a/net/sunrpc/xprtrdma/Makefile b/net/sunrpc/xprtrdma/Makefile index da5136f..579f72b 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 0000000..ffb7d93 --- /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 0000000..79173f9 --- /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 0000000..b0922ac --- /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 99752b5..c3319e1 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 c8afd83..ef3cf4a 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. *