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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/net/sunrpc/xprtrdma/transport.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/net/sunrpc/xprtrdma/transport.c')
-rw-r--r--kernel/net/sunrpc/xprtrdma/transport.c758
1 files changed, 758 insertions, 0 deletions
diff --git a/kernel/net/sunrpc/xprtrdma/transport.c b/kernel/net/sunrpc/xprtrdma/transport.c
new file mode 100644
index 000000000..54f23b1be
--- /dev/null
+++ b/kernel/net/sunrpc/xprtrdma/transport.c
@@ -0,0 +1,758 @@
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * Neither the name of the Network Appliance, Inc. nor the names of
+ * its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * transport.c
+ *
+ * This file contains the top-level implementation of an RPC RDMA
+ * transport.
+ *
+ * Naming convention: functions beginning with xprt_ are part of the
+ * transport switch. All others are RPC RDMA internal.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/sunrpc/addr.h>
+
+#include "xprt_rdma.h"
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY RPCDBG_TRANS
+#endif
+
+MODULE_LICENSE("Dual BSD/GPL");
+
+MODULE_DESCRIPTION("RPC/RDMA Transport for Linux kernel NFS");
+MODULE_AUTHOR("Network Appliance, Inc.");
+
+/*
+ * tunables
+ */
+
+static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE;
+static unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE;
+static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
+static unsigned int xprt_rdma_inline_write_padding;
+static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR;
+ int xprt_rdma_pad_optimize = 1;
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+
+static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE;
+static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE;
+static unsigned int zero;
+static unsigned int max_padding = PAGE_SIZE;
+static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS;
+static unsigned int max_memreg = RPCRDMA_LAST - 1;
+
+static struct ctl_table_header *sunrpc_table_header;
+
+static struct ctl_table xr_tunables_table[] = {
+ {
+ .procname = "rdma_slot_table_entries",
+ .data = &xprt_rdma_slot_table_entries,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_slot_table_size,
+ .extra2 = &max_slot_table_size
+ },
+ {
+ .procname = "rdma_max_inline_read",
+ .data = &xprt_rdma_max_inline_read,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "rdma_max_inline_write",
+ .data = &xprt_rdma_max_inline_write,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "rdma_inline_write_padding",
+ .data = &xprt_rdma_inline_write_padding,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &max_padding,
+ },
+ {
+ .procname = "rdma_memreg_strategy",
+ .data = &xprt_rdma_memreg_strategy,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_memreg,
+ .extra2 = &max_memreg,
+ },
+ {
+ .procname = "rdma_pad_optimize",
+ .data = &xprt_rdma_pad_optimize,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ { },
+};
+
+static struct ctl_table sunrpc_table[] = {
+ {
+ .procname = "sunrpc",
+ .mode = 0555,
+ .child = xr_tunables_table
+ },
+ { },
+};
+
+#endif
+
+#define RPCRDMA_BIND_TO (60U * HZ)
+#define RPCRDMA_INIT_REEST_TO (5U * HZ)
+#define RPCRDMA_MAX_REEST_TO (30U * HZ)
+#define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ)
+
+static struct rpc_xprt_ops xprt_rdma_procs; /* forward reference */
+
+static void
+xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap)
+{
+ struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+ char buf[20];
+
+ snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
+ xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
+
+ xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA;
+}
+
+static void
+xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap)
+{
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+ char buf[40];
+
+ snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
+ xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
+
+ xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6;
+}
+
+static void
+xprt_rdma_format_addresses(struct rpc_xprt *xprt)
+{
+ struct sockaddr *sap = (struct sockaddr *)
+ &rpcx_to_rdmad(xprt).addr;
+ char buf[128];
+
+ switch (sap->sa_family) {
+ case AF_INET:
+ xprt_rdma_format_addresses4(xprt, sap);
+ break;
+ case AF_INET6:
+ xprt_rdma_format_addresses6(xprt, sap);
+ break;
+ default:
+ pr_err("rpcrdma: Unrecognized address family\n");
+ return;
+ }
+
+ (void)rpc_ntop(sap, buf, sizeof(buf));
+ xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
+
+ snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
+ xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
+
+ snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
+ xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
+
+ xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma";
+}
+
+static void
+xprt_rdma_free_addresses(struct rpc_xprt *xprt)
+{
+ unsigned int i;
+
+ for (i = 0; i < RPC_DISPLAY_MAX; i++)
+ switch (i) {
+ case RPC_DISPLAY_PROTO:
+ case RPC_DISPLAY_NETID:
+ continue;
+ default:
+ kfree(xprt->address_strings[i]);
+ }
+}
+
+static void
+xprt_rdma_connect_worker(struct work_struct *work)
+{
+ struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt,
+ rx_connect_worker.work);
+ struct rpc_xprt *xprt = &r_xprt->rx_xprt;
+ int rc = 0;
+
+ xprt_clear_connected(xprt);
+
+ dprintk("RPC: %s: %sconnect\n", __func__,
+ r_xprt->rx_ep.rep_connected != 0 ? "re" : "");
+ rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia);
+ if (rc)
+ xprt_wake_pending_tasks(xprt, rc);
+
+ dprintk("RPC: %s: exit\n", __func__);
+ xprt_clear_connecting(xprt);
+}
+
+/*
+ * xprt_rdma_destroy
+ *
+ * Destroy the xprt.
+ * Free all memory associated with the object, including its own.
+ * NOTE: none of the *destroy methods free memory for their top-level
+ * objects, even though they may have allocated it (they do free
+ * private memory). It's up to the caller to handle it. In this
+ * case (RDMA transport), all structure memory is inlined with the
+ * struct rpcrdma_xprt.
+ */
+static void
+xprt_rdma_destroy(struct rpc_xprt *xprt)
+{
+ struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+
+ dprintk("RPC: %s: called\n", __func__);
+
+ cancel_delayed_work_sync(&r_xprt->rx_connect_worker);
+
+ xprt_clear_connected(xprt);
+
+ rpcrdma_buffer_destroy(&r_xprt->rx_buf);
+ rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia);
+ rpcrdma_ia_close(&r_xprt->rx_ia);
+
+ xprt_rdma_free_addresses(xprt);
+
+ xprt_free(xprt);
+
+ dprintk("RPC: %s: returning\n", __func__);
+
+ module_put(THIS_MODULE);
+}
+
+static const struct rpc_timeout xprt_rdma_default_timeout = {
+ .to_initval = 60 * HZ,
+ .to_maxval = 60 * HZ,
+};
+
+/**
+ * xprt_setup_rdma - Set up transport to use RDMA
+ *
+ * @args: rpc transport arguments
+ */
+static struct rpc_xprt *
+xprt_setup_rdma(struct xprt_create *args)
+{
+ struct rpcrdma_create_data_internal cdata;
+ struct rpc_xprt *xprt;
+ struct rpcrdma_xprt *new_xprt;
+ struct rpcrdma_ep *new_ep;
+ struct sockaddr_in *sin;
+ int rc;
+
+ if (args->addrlen > sizeof(xprt->addr)) {
+ dprintk("RPC: %s: address too large\n", __func__);
+ return ERR_PTR(-EBADF);
+ }
+
+ xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt),
+ xprt_rdma_slot_table_entries,
+ xprt_rdma_slot_table_entries);
+ if (xprt == NULL) {
+ dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n",
+ __func__);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ /* 60 second timeout, no retries */
+ xprt->timeout = &xprt_rdma_default_timeout;
+ xprt->bind_timeout = RPCRDMA_BIND_TO;
+ xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
+ xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
+
+ xprt->resvport = 0; /* privileged port not needed */
+ xprt->tsh_size = 0; /* RPC-RDMA handles framing */
+ xprt->ops = &xprt_rdma_procs;
+
+ /*
+ * Set up RDMA-specific connect data.
+ */
+
+ /* Put server RDMA address in local cdata */
+ memcpy(&cdata.addr, args->dstaddr, args->addrlen);
+
+ /* Ensure xprt->addr holds valid server TCP (not RDMA)
+ * address, for any side protocols which peek at it */
+ xprt->prot = IPPROTO_TCP;
+ xprt->addrlen = args->addrlen;
+ memcpy(&xprt->addr, &cdata.addr, xprt->addrlen);
+
+ sin = (struct sockaddr_in *)&cdata.addr;
+ if (ntohs(sin->sin_port) != 0)
+ xprt_set_bound(xprt);
+
+ dprintk("RPC: %s: %pI4:%u\n",
+ __func__, &sin->sin_addr.s_addr, ntohs(sin->sin_port));
+
+ /* Set max requests */
+ cdata.max_requests = xprt->max_reqs;
+
+ /* Set some length limits */
+ cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
+ cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
+
+ cdata.inline_wsize = xprt_rdma_max_inline_write;
+ if (cdata.inline_wsize > cdata.wsize)
+ cdata.inline_wsize = cdata.wsize;
+
+ cdata.inline_rsize = xprt_rdma_max_inline_read;
+ if (cdata.inline_rsize > cdata.rsize)
+ cdata.inline_rsize = cdata.rsize;
+
+ cdata.padding = xprt_rdma_inline_write_padding;
+
+ /*
+ * Create new transport instance, which includes initialized
+ * o ia
+ * o endpoint
+ * o buffers
+ */
+
+ new_xprt = rpcx_to_rdmax(xprt);
+
+ rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr,
+ xprt_rdma_memreg_strategy);
+ if (rc)
+ goto out1;
+
+ /*
+ * initialize and create ep
+ */
+ new_xprt->rx_data = cdata;
+ new_ep = &new_xprt->rx_ep;
+ new_ep->rep_remote_addr = cdata.addr;
+
+ rc = rpcrdma_ep_create(&new_xprt->rx_ep,
+ &new_xprt->rx_ia, &new_xprt->rx_data);
+ if (rc)
+ goto out2;
+
+ /*
+ * Allocate pre-registered send and receive buffers for headers and
+ * any inline data. Also specify any padding which will be provided
+ * from a preregistered zero buffer.
+ */
+ rc = rpcrdma_buffer_create(new_xprt);
+ if (rc)
+ goto out3;
+
+ /*
+ * Register a callback for connection events. This is necessary because
+ * connection loss notification is async. We also catch connection loss
+ * when reaping receives.
+ */
+ INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
+ xprt_rdma_connect_worker);
+
+ xprt_rdma_format_addresses(xprt);
+ xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt);
+ if (xprt->max_payload == 0)
+ goto out4;
+ xprt->max_payload <<= PAGE_SHIFT;
+ dprintk("RPC: %s: transport data payload maximum: %zu bytes\n",
+ __func__, xprt->max_payload);
+
+ if (!try_module_get(THIS_MODULE))
+ goto out4;
+
+ return xprt;
+
+out4:
+ xprt_rdma_free_addresses(xprt);
+ rc = -EINVAL;
+out3:
+ rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
+out2:
+ rpcrdma_ia_close(&new_xprt->rx_ia);
+out1:
+ xprt_free(xprt);
+ return ERR_PTR(rc);
+}
+
+/*
+ * Close a connection, during shutdown or timeout/reconnect
+ */
+static void
+xprt_rdma_close(struct rpc_xprt *xprt)
+{
+ struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+
+ dprintk("RPC: %s: closing\n", __func__);
+ if (r_xprt->rx_ep.rep_connected > 0)
+ xprt->reestablish_timeout = 0;
+ xprt_disconnect_done(xprt);
+ rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia);
+}
+
+static void
+xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
+{
+ struct sockaddr_in *sap;
+
+ sap = (struct sockaddr_in *)&xprt->addr;
+ sap->sin_port = htons(port);
+ sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr;
+ sap->sin_port = htons(port);
+ dprintk("RPC: %s: %u\n", __func__, port);
+}
+
+static void
+xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+ struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+
+ if (r_xprt->rx_ep.rep_connected != 0) {
+ /* Reconnect */
+ schedule_delayed_work(&r_xprt->rx_connect_worker,
+ xprt->reestablish_timeout);
+ xprt->reestablish_timeout <<= 1;
+ if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO)
+ xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO;
+ else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO)
+ xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
+ } else {
+ schedule_delayed_work(&r_xprt->rx_connect_worker, 0);
+ if (!RPC_IS_ASYNC(task))
+ flush_delayed_work(&r_xprt->rx_connect_worker);
+ }
+}
+
+/*
+ * The RDMA allocate/free functions need the task structure as a place
+ * to hide the struct rpcrdma_req, which is necessary for the actual send/recv
+ * sequence.
+ *
+ * The RPC layer allocates both send and receive buffers in the same call
+ * (rq_send_buf and rq_rcv_buf are both part of a single contiguous buffer).
+ * We may register rq_rcv_buf when using reply chunks.
+ */
+static void *
+xprt_rdma_allocate(struct rpc_task *task, size_t size)
+{
+ struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
+ struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+ struct rpcrdma_regbuf *rb;
+ struct rpcrdma_req *req;
+ size_t min_size;
+ gfp_t flags;
+
+ req = rpcrdma_buffer_get(&r_xprt->rx_buf);
+ if (req == NULL)
+ return NULL;
+
+ flags = GFP_NOIO | __GFP_NOWARN;
+ if (RPC_IS_SWAPPER(task))
+ flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
+
+ if (req->rl_rdmabuf == NULL)
+ goto out_rdmabuf;
+ if (req->rl_sendbuf == NULL)
+ goto out_sendbuf;
+ if (size > req->rl_sendbuf->rg_size)
+ goto out_sendbuf;
+
+out:
+ dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req);
+ req->rl_connect_cookie = 0; /* our reserved value */
+ return req->rl_sendbuf->rg_base;
+
+out_rdmabuf:
+ min_size = RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp);
+ rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, min_size, flags);
+ if (IS_ERR(rb))
+ goto out_fail;
+ req->rl_rdmabuf = rb;
+
+out_sendbuf:
+ /* XDR encoding and RPC/RDMA marshaling of this request has not
+ * yet occurred. Thus a lower bound is needed to prevent buffer
+ * overrun during marshaling.
+ *
+ * RPC/RDMA marshaling may choose to send payload bearing ops
+ * inline, if the result is smaller than the inline threshold.
+ * The value of the "size" argument accounts for header
+ * requirements but not for the payload in these cases.
+ *
+ * Likewise, allocate enough space to receive a reply up to the
+ * size of the inline threshold.
+ *
+ * It's unlikely that both the send header and the received
+ * reply will be large, but slush is provided here to allow
+ * flexibility when marshaling.
+ */
+ min_size = RPCRDMA_INLINE_READ_THRESHOLD(task->tk_rqstp);
+ min_size += RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp);
+ if (size < min_size)
+ size = min_size;
+
+ rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, size, flags);
+ if (IS_ERR(rb))
+ goto out_fail;
+ rb->rg_owner = req;
+
+ r_xprt->rx_stats.hardway_register_count += size;
+ rpcrdma_free_regbuf(&r_xprt->rx_ia, req->rl_sendbuf);
+ req->rl_sendbuf = rb;
+ goto out;
+
+out_fail:
+ rpcrdma_buffer_put(req);
+ r_xprt->rx_stats.failed_marshal_count++;
+ return NULL;
+}
+
+/*
+ * This function returns all RDMA resources to the pool.
+ */
+static void
+xprt_rdma_free(void *buffer)
+{
+ struct rpcrdma_req *req;
+ struct rpcrdma_xprt *r_xprt;
+ struct rpcrdma_regbuf *rb;
+ int i;
+
+ if (buffer == NULL)
+ return;
+
+ rb = container_of(buffer, struct rpcrdma_regbuf, rg_base[0]);
+ req = rb->rg_owner;
+ r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf);
+
+ dprintk("RPC: %s: called on 0x%p\n", __func__, req->rl_reply);
+
+ for (i = 0; req->rl_nchunks;) {
+ --req->rl_nchunks;
+ i += r_xprt->rx_ia.ri_ops->ro_unmap(r_xprt,
+ &req->rl_segments[i]);
+ }
+
+ rpcrdma_buffer_put(req);
+}
+
+/*
+ * send_request invokes the meat of RPC RDMA. It must do the following:
+ * 1. Marshal the RPC request into an RPC RDMA request, which means
+ * putting a header in front of data, and creating IOVs for RDMA
+ * from those in the request.
+ * 2. In marshaling, detect opportunities for RDMA, and use them.
+ * 3. Post a recv message to set up asynch completion, then send
+ * the request (rpcrdma_ep_post).
+ * 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP).
+ */
+
+static int
+xprt_rdma_send_request(struct rpc_task *task)
+{
+ struct rpc_rqst *rqst = task->tk_rqstp;
+ struct rpc_xprt *xprt = rqst->rq_xprt;
+ struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
+ struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+ int rc = 0;
+
+ rc = rpcrdma_marshal_req(rqst);
+ if (rc < 0)
+ goto failed_marshal;
+
+ if (req->rl_reply == NULL) /* e.g. reconnection */
+ rpcrdma_recv_buffer_get(req);
+
+ if (req->rl_reply) {
+ req->rl_reply->rr_func = rpcrdma_reply_handler;
+ /* this need only be done once, but... */
+ req->rl_reply->rr_xprt = xprt;
+ }
+
+ /* Must suppress retransmit to maintain credits */
+ if (req->rl_connect_cookie == xprt->connect_cookie)
+ goto drop_connection;
+ req->rl_connect_cookie = xprt->connect_cookie;
+
+ if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
+ goto drop_connection;
+
+ rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
+ rqst->rq_bytes_sent = 0;
+ return 0;
+
+failed_marshal:
+ r_xprt->rx_stats.failed_marshal_count++;
+ dprintk("RPC: %s: rpcrdma_marshal_req failed, status %i\n",
+ __func__, rc);
+ if (rc == -EIO)
+ return -EIO;
+drop_connection:
+ xprt_disconnect_done(xprt);
+ return -ENOTCONN; /* implies disconnect */
+}
+
+static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
+{
+ struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
+ long idle_time = 0;
+
+ if (xprt_connected(xprt))
+ idle_time = (long)(jiffies - xprt->last_used) / HZ;
+
+ seq_printf(seq,
+ "\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu "
+ "%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n",
+
+ 0, /* need a local port? */
+ xprt->stat.bind_count,
+ xprt->stat.connect_count,
+ xprt->stat.connect_time,
+ idle_time,
+ xprt->stat.sends,
+ xprt->stat.recvs,
+ xprt->stat.bad_xids,
+ xprt->stat.req_u,
+ xprt->stat.bklog_u,
+
+ r_xprt->rx_stats.read_chunk_count,
+ r_xprt->rx_stats.write_chunk_count,
+ r_xprt->rx_stats.reply_chunk_count,
+ r_xprt->rx_stats.total_rdma_request,
+ r_xprt->rx_stats.total_rdma_reply,
+ r_xprt->rx_stats.pullup_copy_count,
+ r_xprt->rx_stats.fixup_copy_count,
+ r_xprt->rx_stats.hardway_register_count,
+ r_xprt->rx_stats.failed_marshal_count,
+ r_xprt->rx_stats.bad_reply_count);
+}
+
+/*
+ * Plumbing for rpc transport switch and kernel module
+ */
+
+static struct rpc_xprt_ops xprt_rdma_procs = {
+ .reserve_xprt = xprt_reserve_xprt_cong,
+ .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */
+ .alloc_slot = xprt_alloc_slot,
+ .release_request = xprt_release_rqst_cong, /* ditto */
+ .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */
+ .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */
+ .set_port = xprt_rdma_set_port,
+ .connect = xprt_rdma_connect,
+ .buf_alloc = xprt_rdma_allocate,
+ .buf_free = xprt_rdma_free,
+ .send_request = xprt_rdma_send_request,
+ .close = xprt_rdma_close,
+ .destroy = xprt_rdma_destroy,
+ .print_stats = xprt_rdma_print_stats
+};
+
+static struct xprt_class xprt_rdma = {
+ .list = LIST_HEAD_INIT(xprt_rdma.list),
+ .name = "rdma",
+ .owner = THIS_MODULE,
+ .ident = XPRT_TRANSPORT_RDMA,
+ .setup = xprt_setup_rdma,
+};
+
+static void __exit xprt_rdma_cleanup(void)
+{
+ int rc;
+
+ dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n");
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+ if (sunrpc_table_header) {
+ unregister_sysctl_table(sunrpc_table_header);
+ sunrpc_table_header = NULL;
+ }
+#endif
+ rc = xprt_unregister_transport(&xprt_rdma);
+ if (rc)
+ dprintk("RPC: %s: xprt_unregister returned %i\n",
+ __func__, rc);
+}
+
+static int __init xprt_rdma_init(void)
+{
+ int rc;
+
+ rc = xprt_register_transport(&xprt_rdma);
+
+ if (rc)
+ return rc;
+
+ dprintk("RPCRDMA Module Init, register RPC RDMA transport\n");
+
+ dprintk("Defaults:\n");
+ dprintk("\tSlots %d\n"
+ "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n",
+ xprt_rdma_slot_table_entries,
+ xprt_rdma_max_inline_read, xprt_rdma_max_inline_write);
+ dprintk("\tPadding %d\n\tMemreg %d\n",
+ xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy);
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+ if (!sunrpc_table_header)
+ sunrpc_table_header = register_sysctl_table(sunrpc_table);
+#endif
+ return 0;
+}
+
+module_init(xprt_rdma_init);
+module_exit(xprt_rdma_cleanup);