Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 614 insertions, 0 deletions

diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
new file mode 100644
index 000000000..5f7e3d125
--- /dev/null
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -0,0 +1,614 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Copyright (c) 2015-2018 Oracle. All rights reserved.
+ * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
+ * Copyright (c) 2005-2007 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.
+ *
+ * Author: Tom Tucker <tom@opengridcomputing.com>
+ */
+
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/export.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <rdma/rw.h>
+
+#include <linux/sunrpc/addr.h>
+#include <linux/sunrpc/debug.h>
+#include <linux/sunrpc/svc_xprt.h>
+#include <linux/sunrpc/svc_rdma.h>
+
+#include "xprt_rdma.h"
+#include <trace/events/rpcrdma.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv,
+						 struct net *net);
+static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
+					struct net *net,
+					struct sockaddr *sa, int salen,
+					int flags);
+static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt);
+static void svc_rdma_detach(struct svc_xprt *xprt);
+static void svc_rdma_free(struct svc_xprt *xprt);
+static int svc_rdma_has_wspace(struct svc_xprt *xprt);
+static void svc_rdma_secure_port(struct svc_rqst *);
+static void svc_rdma_kill_temp_xprt(struct svc_xprt *);
+
+static const struct svc_xprt_ops svc_rdma_ops = {
+	.xpo_create = svc_rdma_create,
+	.xpo_recvfrom = svc_rdma_recvfrom,
+	.xpo_sendto = svc_rdma_sendto,
+	.xpo_read_payload = svc_rdma_read_payload,
+	.xpo_release_rqst = svc_rdma_release_rqst,
+	.xpo_detach = svc_rdma_detach,
+	.xpo_free = svc_rdma_free,
+	.xpo_has_wspace = svc_rdma_has_wspace,
+	.xpo_accept = svc_rdma_accept,
+	.xpo_secure_port = svc_rdma_secure_port,
+	.xpo_kill_temp_xprt = svc_rdma_kill_temp_xprt,
+};
+
+struct svc_xprt_class svc_rdma_class = {
+	.xcl_name = "rdma",
+	.xcl_owner = THIS_MODULE,
+	.xcl_ops = &svc_rdma_ops,
+	.xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA,
+	.xcl_ident = XPRT_TRANSPORT_RDMA,
+};
+
+/* QP event handler */
+static void qp_event_handler(struct ib_event *event, void *context)
+{
+	struct svc_xprt *xprt = context;
+
+	trace_svcrdma_qp_error(event, (struct sockaddr *)&xprt->xpt_remote);
+	switch (event->event) {
+	/* These are considered benign events */
+	case IB_EVENT_PATH_MIG:
+	case IB_EVENT_COMM_EST:
+	case IB_EVENT_SQ_DRAINED:
+	case IB_EVENT_QP_LAST_WQE_REACHED:
+		break;
+
+	/* These are considered fatal events */
+	case IB_EVENT_PATH_MIG_ERR:
+	case IB_EVENT_QP_FATAL:
+	case IB_EVENT_QP_REQ_ERR:
+	case IB_EVENT_QP_ACCESS_ERR:
+	case IB_EVENT_DEVICE_FATAL:
+	default:
+		set_bit(XPT_CLOSE, &xprt->xpt_flags);
+		svc_xprt_enqueue(xprt);
+		break;
+	}
+}
+
+static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv,
+						 struct net *net)
+{
+	struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL);
+
+	if (!cma_xprt) {
+		dprintk("svcrdma: failed to create new transport\n");
+		return NULL;
+	}
+	svc_xprt_init(net, &svc_rdma_class, &cma_xprt->sc_xprt, serv);
+	INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
+	INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);
+	INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q);
+	INIT_LIST_HEAD(&cma_xprt->sc_send_ctxts);
+	init_llist_head(&cma_xprt->sc_recv_ctxts);
+	INIT_LIST_HEAD(&cma_xprt->sc_rw_ctxts);
+	init_waitqueue_head(&cma_xprt->sc_send_wait);
+
+	spin_lock_init(&cma_xprt->sc_lock);
+	spin_lock_init(&cma_xprt->sc_rq_dto_lock);
+	spin_lock_init(&cma_xprt->sc_send_lock);
+	spin_lock_init(&cma_xprt->sc_rw_ctxt_lock);
+
+	/*
+	 * Note that this implies that the underlying transport support
+	 * has some form of congestion control (see RFC 7530 section 3.1
+	 * paragraph 2). For now, we assume that all supported RDMA
+	 * transports are suitable here.
+	 */
+	set_bit(XPT_CONG_CTRL, &cma_xprt->sc_xprt.xpt_flags);
+
+	return cma_xprt;
+}
+
+static void
+svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt,
+			       struct rdma_conn_param *param)
+{
+	const struct rpcrdma_connect_private *pmsg = param->private_data;
+
+	if (pmsg &&
+	    pmsg->cp_magic == rpcrdma_cmp_magic &&
+	    pmsg->cp_version == RPCRDMA_CMP_VERSION) {
+		newxprt->sc_snd_w_inv = pmsg->cp_flags &
+					RPCRDMA_CMP_F_SND_W_INV_OK;
+
+		dprintk("svcrdma: client send_size %u, recv_size %u "
+			"remote inv %ssupported\n",
+			rpcrdma_decode_buffer_size(pmsg->cp_send_size),
+			rpcrdma_decode_buffer_size(pmsg->cp_recv_size),
+			newxprt->sc_snd_w_inv ? "" : "un");
+	}
+}
+
+/*
+ * This function handles the CONNECT_REQUEST event on a listening
+ * endpoint. It is passed the cma_id for the _new_ connection. The context in
+ * this cma_id is inherited from the listening cma_id and is the svc_xprt
+ * structure for the listening endpoint.
+ *
+ * This function creates a new xprt for the new connection and enqueues it on
+ * the accept queue for the listent xprt. When the listen thread is kicked, it
+ * will call the recvfrom method on the listen xprt which will accept the new
+ * connection.
+ */
+static void handle_connect_req(struct rdma_cm_id *new_cma_id,
+			       struct rdma_conn_param *param)
+{
+	struct svcxprt_rdma *listen_xprt = new_cma_id->context;
+	struct svcxprt_rdma *newxprt;
+	struct sockaddr *sa;
+
+	/* Create a new transport */
+	newxprt = svc_rdma_create_xprt(listen_xprt->sc_xprt.xpt_server,
+				       listen_xprt->sc_xprt.xpt_net);
+	if (!newxprt)
+		return;
+	newxprt->sc_cm_id = new_cma_id;
+	new_cma_id->context = newxprt;
+	svc_rdma_parse_connect_private(newxprt, param);
+
+	/* Save client advertised inbound read limit for use later in accept. */
+	newxprt->sc_ord = param->initiator_depth;
+
+	sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
+	newxprt->sc_xprt.xpt_remotelen = svc_addr_len(sa);
+	memcpy(&newxprt->sc_xprt.xpt_remote, sa,
+	       newxprt->sc_xprt.xpt_remotelen);
+	snprintf(newxprt->sc_xprt.xpt_remotebuf,
+		 sizeof(newxprt->sc_xprt.xpt_remotebuf) - 1, "%pISc", sa);
+
+	/* The remote port is arbitrary and not under the control of the
+	 * client ULP. Set it to a fixed value so that the DRC continues
+	 * to be effective after a reconnect.
+	 */
+	rpc_set_port((struct sockaddr *)&newxprt->sc_xprt.xpt_remote, 0);
+
+	sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr;
+	svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa));
+
+	/*
+	 * Enqueue the new transport on the accept queue of the listening
+	 * transport
+	 */
+	spin_lock(&listen_xprt->sc_lock);
+	list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q);
+	spin_unlock(&listen_xprt->sc_lock);
+
+	set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags);
+	svc_xprt_enqueue(&listen_xprt->sc_xprt);
+}
+
+/**
+ * svc_rdma_listen_handler - Handle CM events generated on a listening endpoint
+ * @cma_id: the server's listener rdma_cm_id
+ * @event: details of the event
+ *
+ * Return values:
+ *     %0: Do not destroy @cma_id
+ *     %1: Destroy @cma_id (never returned here)
+ *
+ * NB: There is never a DEVICE_REMOVAL event for INADDR_ANY listeners.
+ */
+static int svc_rdma_listen_handler(struct rdma_cm_id *cma_id,
+				   struct rdma_cm_event *event)
+{
+	switch (event->event) {
+	case RDMA_CM_EVENT_CONNECT_REQUEST:
+		handle_connect_req(cma_id, &event->param.conn);
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
+/**
+ * svc_rdma_cma_handler - Handle CM events on client connections
+ * @cma_id: the server's listener rdma_cm_id
+ * @event: details of the event
+ *
+ * Return values:
+ *     %0: Do not destroy @cma_id
+ *     %1: Destroy @cma_id (never returned here)
+ */
+static int svc_rdma_cma_handler(struct rdma_cm_id *cma_id,
+				struct rdma_cm_event *event)
+{
+	struct svcxprt_rdma *rdma = cma_id->context;
+	struct svc_xprt *xprt = &rdma->sc_xprt;
+
+	switch (event->event) {
+	case RDMA_CM_EVENT_ESTABLISHED:
+		clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags);
+		svc_xprt_enqueue(xprt);
+		break;
+	case RDMA_CM_EVENT_DISCONNECTED:
+	case RDMA_CM_EVENT_DEVICE_REMOVAL:
+		set_bit(XPT_CLOSE, &xprt->xpt_flags);
+		svc_xprt_enqueue(xprt);
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
+/*
+ * Create a listening RDMA service endpoint.
+ */
+static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
+					struct net *net,
+					struct sockaddr *sa, int salen,
+					int flags)
+{
+	struct rdma_cm_id *listen_id;
+	struct svcxprt_rdma *cma_xprt;
+	int ret;
+
+	if (sa->sa_family != AF_INET && sa->sa_family != AF_INET6)
+		return ERR_PTR(-EAFNOSUPPORT);
+	cma_xprt = svc_rdma_create_xprt(serv, net);
+	if (!cma_xprt)
+		return ERR_PTR(-ENOMEM);
+	set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags);
+	strcpy(cma_xprt->sc_xprt.xpt_remotebuf, "listener");
+
+	listen_id = rdma_create_id(net, svc_rdma_listen_handler, cma_xprt,
+				   RDMA_PS_TCP, IB_QPT_RC);
+	if (IS_ERR(listen_id)) {
+		ret = PTR_ERR(listen_id);
+		goto err0;
+	}
+
+	/* Allow both IPv4 and IPv6 sockets to bind a single port
+	 * at the same time.
+	 */
+#if IS_ENABLED(CONFIG_IPV6)
+	ret = rdma_set_afonly(listen_id, 1);
+	if (ret)
+		goto err1;
+#endif
+	ret = rdma_bind_addr(listen_id, sa);
+	if (ret)
+		goto err1;
+	cma_xprt->sc_cm_id = listen_id;
+
+	ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG);
+	if (ret)
+		goto err1;
+
+	/*
+	 * We need to use the address from the cm_id in case the
+	 * caller specified 0 for the port number.
+	 */
+	sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr;
+	svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen);
+
+	return &cma_xprt->sc_xprt;
+
+ err1:
+	rdma_destroy_id(listen_id);
+ err0:
+	kfree(cma_xprt);
+	return ERR_PTR(ret);
+}
+
+/*
+ * This is the xpo_recvfrom function for listening endpoints. Its
+ * purpose is to accept incoming connections. The CMA callback handler
+ * has already created a new transport and attached it to the new CMA
+ * ID.
+ *
+ * There is a queue of pending connections hung on the listening
+ * transport. This queue contains the new svc_xprt structure. This
+ * function takes svc_xprt structures off the accept_q and completes
+ * the connection.
+ */
+static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
+{
+	struct svcxprt_rdma *listen_rdma;
+	struct svcxprt_rdma *newxprt = NULL;
+	struct rdma_conn_param conn_param;
+	struct rpcrdma_connect_private pmsg;
+	struct ib_qp_init_attr qp_attr;
+	unsigned int ctxts, rq_depth;
+	struct ib_device *dev;
+	int ret = 0;
+	RPC_IFDEBUG(struct sockaddr *sap);
+
+	listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt);
+	clear_bit(XPT_CONN, &xprt->xpt_flags);
+	/* Get the next entry off the accept list */
+	spin_lock(&listen_rdma->sc_lock);
+	if (!list_empty(&listen_rdma->sc_accept_q)) {
+		newxprt = list_entry(listen_rdma->sc_accept_q.next,
+				     struct svcxprt_rdma, sc_accept_q);
+		list_del_init(&newxprt->sc_accept_q);
+	}
+	if (!list_empty(&listen_rdma->sc_accept_q))
+		set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags);
+	spin_unlock(&listen_rdma->sc_lock);
+	if (!newxprt)
+		return NULL;
+
+	dev = newxprt->sc_cm_id->device;
+	newxprt->sc_port_num = newxprt->sc_cm_id->port_num;
+
+	/* Qualify the transport resource defaults with the
+	 * capabilities of this particular device */
+	/* Transport header, head iovec, tail iovec */
+	newxprt->sc_max_send_sges = 3;
+	/* Add one SGE per page list entry */
+	newxprt->sc_max_send_sges += (svcrdma_max_req_size / PAGE_SIZE) + 1;
+	if (newxprt->sc_max_send_sges > dev->attrs.max_send_sge)
+		newxprt->sc_max_send_sges = dev->attrs.max_send_sge;
+	newxprt->sc_max_req_size = svcrdma_max_req_size;
+	newxprt->sc_max_requests = svcrdma_max_requests;
+	newxprt->sc_max_bc_requests = svcrdma_max_bc_requests;
+	rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests;
+	if (rq_depth > dev->attrs.max_qp_wr) {
+		pr_warn("svcrdma: reducing receive depth to %d\n",
+			dev->attrs.max_qp_wr);
+		rq_depth = dev->attrs.max_qp_wr;
+		newxprt->sc_max_requests = rq_depth - 2;
+		newxprt->sc_max_bc_requests = 2;
+	}
+	newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests);
+	ctxts = rdma_rw_mr_factor(dev, newxprt->sc_port_num, RPCSVC_MAXPAGES);
+	ctxts *= newxprt->sc_max_requests;
+	newxprt->sc_sq_depth = rq_depth + ctxts;
+	if (newxprt->sc_sq_depth > dev->attrs.max_qp_wr) {
+		pr_warn("svcrdma: reducing send depth to %d\n",
+			dev->attrs.max_qp_wr);
+		newxprt->sc_sq_depth = dev->attrs.max_qp_wr;
+	}
+	atomic_set(&newxprt->sc_sq_avail, newxprt->sc_sq_depth);
+
+	newxprt->sc_pd = ib_alloc_pd(dev, 0);
+	if (IS_ERR(newxprt->sc_pd)) {
+		trace_svcrdma_pd_err(newxprt, PTR_ERR(newxprt->sc_pd));
+		goto errout;
+	}
+	newxprt->sc_sq_cq = ib_alloc_cq_any(dev, newxprt, newxprt->sc_sq_depth,
+					    IB_POLL_WORKQUEUE);
+	if (IS_ERR(newxprt->sc_sq_cq))
+		goto errout;
+	newxprt->sc_rq_cq =
+		ib_alloc_cq_any(dev, newxprt, rq_depth, IB_POLL_WORKQUEUE);
+	if (IS_ERR(newxprt->sc_rq_cq))
+		goto errout;
+
+	memset(&qp_attr, 0, sizeof qp_attr);
+	qp_attr.event_handler = qp_event_handler;
+	qp_attr.qp_context = &newxprt->sc_xprt;
+	qp_attr.port_num = newxprt->sc_port_num;
+	qp_attr.cap.max_rdma_ctxs = ctxts;
+	qp_attr.cap.max_send_wr = newxprt->sc_sq_depth - ctxts;
+	qp_attr.cap.max_recv_wr = rq_depth;
+	qp_attr.cap.max_send_sge = newxprt->sc_max_send_sges;
+	qp_attr.cap.max_recv_sge = 1;
+	qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+	qp_attr.qp_type = IB_QPT_RC;
+	qp_attr.send_cq = newxprt->sc_sq_cq;
+	qp_attr.recv_cq = newxprt->sc_rq_cq;
+	dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n",
+		newxprt->sc_cm_id, newxprt->sc_pd);
+	dprintk("    cap.max_send_wr = %d, cap.max_recv_wr = %d\n",
+		qp_attr.cap.max_send_wr, qp_attr.cap.max_recv_wr);
+	dprintk("    cap.max_send_sge = %d, cap.max_recv_sge = %d\n",
+		qp_attr.cap.max_send_sge, qp_attr.cap.max_recv_sge);
+
+	ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr);
+	if (ret) {
+		trace_svcrdma_qp_err(newxprt, ret);
+		goto errout;
+	}
+	newxprt->sc_qp = newxprt->sc_cm_id->qp;
+
+	if (!(dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
+		newxprt->sc_snd_w_inv = false;
+	if (!rdma_protocol_iwarp(dev, newxprt->sc_port_num) &&
+	    !rdma_ib_or_roce(dev, newxprt->sc_port_num)) {
+		trace_svcrdma_fabric_err(newxprt, -EINVAL);
+		goto errout;
+	}
+
+	if (!svc_rdma_post_recvs(newxprt))
+		goto errout;
+
+	/* Construct RDMA-CM private message */
+	pmsg.cp_magic = rpcrdma_cmp_magic;
+	pmsg.cp_version = RPCRDMA_CMP_VERSION;
+	pmsg.cp_flags = 0;
+	pmsg.cp_send_size = pmsg.cp_recv_size =
+		rpcrdma_encode_buffer_size(newxprt->sc_max_req_size);
+
+	/* Accept Connection */
+	set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags);
+	memset(&conn_param, 0, sizeof conn_param);
+	conn_param.responder_resources = 0;
+	conn_param.initiator_depth = min_t(int, newxprt->sc_ord,
+					   dev->attrs.max_qp_init_rd_atom);
+	if (!conn_param.initiator_depth) {
+		ret = -EINVAL;
+		trace_svcrdma_initdepth_err(newxprt, ret);
+		goto errout;
+	}
+	conn_param.private_data = &pmsg;
+	conn_param.private_data_len = sizeof(pmsg);
+	rdma_lock_handler(newxprt->sc_cm_id);
+	newxprt->sc_cm_id->event_handler = svc_rdma_cma_handler;
+	ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
+	rdma_unlock_handler(newxprt->sc_cm_id);
+	if (ret) {
+		trace_svcrdma_accept_err(newxprt, ret);
+		goto errout;
+	}
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	dprintk("svcrdma: new connection %p accepted:\n", newxprt);
+	sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr;
+	dprintk("    local address   : %pIS:%u\n", sap, rpc_get_port(sap));
+	sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
+	dprintk("    remote address  : %pIS:%u\n", sap, rpc_get_port(sap));
+	dprintk("    max_sge         : %d\n", newxprt->sc_max_send_sges);
+	dprintk("    sq_depth        : %d\n", newxprt->sc_sq_depth);
+	dprintk("    rdma_rw_ctxs    : %d\n", ctxts);
+	dprintk("    max_requests    : %d\n", newxprt->sc_max_requests);
+	dprintk("    ord             : %d\n", conn_param.initiator_depth);
+#endif
+
+	return &newxprt->sc_xprt;
+
+ errout:
+	/* Take a reference in case the DTO handler runs */
+	svc_xprt_get(&newxprt->sc_xprt);
+	if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp))
+		ib_destroy_qp(newxprt->sc_qp);
+	rdma_destroy_id(newxprt->sc_cm_id);
+	/* This call to put will destroy the transport */
+	svc_xprt_put(&newxprt->sc_xprt);
+	return NULL;
+}
+
+static void svc_rdma_detach(struct svc_xprt *xprt)
+{
+	struct svcxprt_rdma *rdma =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+
+	rdma_disconnect(rdma->sc_cm_id);
+}
+
+static void __svc_rdma_free(struct work_struct *work)
+{
+	struct svcxprt_rdma *rdma =
+		container_of(work, struct svcxprt_rdma, sc_work);
+	struct svc_xprt *xprt = &rdma->sc_xprt;
+
+	/* This blocks until the Completion Queues are empty */
+	if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
+		ib_drain_qp(rdma->sc_qp);
+
+	svc_rdma_flush_recv_queues(rdma);
+
+	/* Final put of backchannel client transport */
+	if (xprt->xpt_bc_xprt) {
+		xprt_put(xprt->xpt_bc_xprt);
+		xprt->xpt_bc_xprt = NULL;
+	}
+
+	svc_rdma_destroy_rw_ctxts(rdma);
+	svc_rdma_send_ctxts_destroy(rdma);
+	svc_rdma_recv_ctxts_destroy(rdma);
+
+	/* Destroy the QP if present (not a listener) */
+	if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
+		ib_destroy_qp(rdma->sc_qp);
+
+	if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq))
+		ib_free_cq(rdma->sc_sq_cq);
+
+	if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq))
+		ib_free_cq(rdma->sc_rq_cq);
+
+	if (rdma->sc_pd && !IS_ERR(rdma->sc_pd))
+		ib_dealloc_pd(rdma->sc_pd);
+
+	/* Destroy the CM ID */
+	rdma_destroy_id(rdma->sc_cm_id);
+
+	kfree(rdma);
+}
+
+static void svc_rdma_free(struct svc_xprt *xprt)
+{
+	struct svcxprt_rdma *rdma =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+
+	INIT_WORK(&rdma->sc_work, __svc_rdma_free);
+	schedule_work(&rdma->sc_work);
+}
+
+static int svc_rdma_has_wspace(struct svc_xprt *xprt)
+{
+	struct svcxprt_rdma *rdma =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+
+	/*
+	 * If there are already waiters on the SQ,
+	 * return false.
+	 */
+	if (waitqueue_active(&rdma->sc_send_wait))
+		return 0;
+
+	/* Otherwise return true. */
+	return 1;
+}
+
+static void svc_rdma_secure_port(struct svc_rqst *rqstp)
+{
+	set_bit(RQ_SECURE, &rqstp->rq_flags);
+}
+
+static void svc_rdma_kill_temp_xprt(struct svc_xprt *xprt)
+{
+}