Merge branch 'for-linus' of git://linux-nfs.org/~bfields/linux

* 'for-linus' of git://linux-nfs.org/~bfields/linux: (100 commits)
  SUNRPC: RPC program information is stored in unsigned integers
  SUNRPC: Move exported symbol definitions after function declaration part 2
  NLM: tear down RPC clients in nlm_shutdown_hosts
  SUNRPC: spin svc_rqst initialization to its own function
  nfsd: more careful input validation in nfsctl write methods
  lockd: minor log message fix
  knfsd: don't bother mapping putrootfh enoent to eperm
  rdma: makefile
  rdma: ONCRPC RDMA protocol marshalling
  rdma: SVCRDMA sendto
  rdma: SVCRDMA recvfrom
  rdma: SVCRDMA Core Transport Services
  rdma: SVCRDMA Transport Module
  rdma: SVCRMDA Header File
  svc: Add svc_xprt_names service to replace svc_sock_names
  knfsd: Support adding transports by writing portlist file
  svc: Add svc API that queries for a transport instance
  svc: Add /proc/sys/sunrpc/transport files
  svc: Add transport hdr size for defer/revisit
  svc: Move the xprt independent code to the svc_xprt.c file
  ...

6 files changed, 2869 insertions, 0 deletions

diff --git a/net/sunrpc/xprtrdma/Makefile b/net/sunrpc/xprtrdma/Makefile
index 264f0feeb513..5a8f268bdd30 100644
--- a/net/sunrpc/xprtrdma/Makefile
+++ b/net/sunrpc/xprtrdma/Makefile
@@ -1,3 +1,8 @@
 obj-$(CONFIG_SUNRPC_XPRT_RDMA) += xprtrdma.o
 
 xprtrdma-y := transport.o rpc_rdma.o verbs.o
+
+obj-$(CONFIG_SUNRPC_XPRT_RDMA) += svcrdma.o
+
+svcrdma-y := svc_rdma.o svc_rdma_transport.o \
+	svc_rdma_marshal.o svc_rdma_sendto.o svc_rdma_recvfrom.o
diff --git a/net/sunrpc/xprtrdma/svc_rdma.c b/net/sunrpc/xprtrdma/svc_rdma.c
new file mode 100644
index 000000000000..88c0ca20bb1e
--- /dev/null
+++ b/net/sunrpc/xprtrdma/svc_rdma.c
@@ -0,0 +1,266 @@
+/*
+ * Copyright (c) 2005-2006 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/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/sysctl.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/svc_rdma.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+/* RPC/RDMA parameters */
+unsigned int svcrdma_ord = RPCRDMA_ORD;
+static unsigned int min_ord = 1;
+static unsigned int max_ord = 4096;
+unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
+static unsigned int min_max_requests = 4;
+static unsigned int max_max_requests = 16384;
+unsigned int svcrdma_max_req_size = RPCRDMA_MAX_REQ_SIZE;
+static unsigned int min_max_inline = 4096;
+static unsigned int max_max_inline = 65536;
+
+atomic_t rdma_stat_recv;
+atomic_t rdma_stat_read;
+atomic_t rdma_stat_write;
+atomic_t rdma_stat_sq_starve;
+atomic_t rdma_stat_rq_starve;
+atomic_t rdma_stat_rq_poll;
+atomic_t rdma_stat_rq_prod;
+atomic_t rdma_stat_sq_poll;
+atomic_t rdma_stat_sq_prod;
+
+/*
+ * This function implements reading and resetting an atomic_t stat
+ * variable through read/write to a proc file. Any write to the file
+ * resets the associated statistic to zero. Any read returns it's
+ * current value.
+ */
+static int read_reset_stat(ctl_table *table, int write,
+			   struct file *filp, void __user *buffer, size_t *lenp,
+			   loff_t *ppos)
+{
+	atomic_t *stat = (atomic_t *)table->data;
+
+	if (!stat)
+		return -EINVAL;
+
+	if (write)
+		atomic_set(stat, 0);
+	else {
+		char str_buf[32];
+		char *data;
+		int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
+		if (len >= 32)
+			return -EFAULT;
+		len = strlen(str_buf);
+		if (*ppos > len) {
+			*lenp = 0;
+			return 0;
+		}
+		data = &str_buf[*ppos];
+		len -= *ppos;
+		if (len > *lenp)
+			len = *lenp;
+		if (len && copy_to_user(buffer, str_buf, len))
+			return -EFAULT;
+		*lenp = len;
+		*ppos += len;
+	}
+	return 0;
+}
+
+static struct ctl_table_header *svcrdma_table_header;
+static ctl_table svcrdma_parm_table[] = {
+	{
+		.procname	= "max_requests",
+		.data		= &svcrdma_max_requests,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &min_max_requests,
+		.extra2		= &max_max_requests
+	},
+	{
+		.procname	= "max_req_size",
+		.data		= &svcrdma_max_req_size,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &min_max_inline,
+		.extra2		= &max_max_inline
+	},
+	{
+		.procname	= "max_outbound_read_requests",
+		.data		= &svcrdma_ord,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &min_ord,
+		.extra2		= &max_ord,
+	},
+
+	{
+		.procname	= "rdma_stat_read",
+		.data		= &rdma_stat_read,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= &read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_recv",
+		.data		= &rdma_stat_recv,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= &read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_write",
+		.data		= &rdma_stat_write,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= &read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_sq_starve",
+		.data		= &rdma_stat_sq_starve,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= &read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_rq_starve",
+		.data		= &rdma_stat_rq_starve,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= &read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_rq_poll",
+		.data		= &rdma_stat_rq_poll,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= &read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_rq_prod",
+		.data		= &rdma_stat_rq_prod,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= &read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_sq_poll",
+		.data		= &rdma_stat_sq_poll,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= &read_reset_stat,
+	},
+	{
+		.procname	= "rdma_stat_sq_prod",
+		.data		= &rdma_stat_sq_prod,
+		.maxlen		= sizeof(atomic_t),
+		.mode		= 0644,
+		.proc_handler	= &read_reset_stat,
+	},
+	{
+		.ctl_name = 0,
+	},
+};
+
+static ctl_table svcrdma_table[] = {
+	{
+		.procname	= "svc_rdma",
+		.mode		= 0555,
+		.child		= svcrdma_parm_table
+	},
+	{
+		.ctl_name = 0,
+	},
+};
+
+static ctl_table svcrdma_root_table[] = {
+	{
+		.ctl_name	= CTL_SUNRPC,
+		.procname	= "sunrpc",
+		.mode		= 0555,
+		.child		= svcrdma_table
+	},
+	{
+		.ctl_name = 0,
+	},
+};
+
+void svc_rdma_cleanup(void)
+{
+	dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
+	if (svcrdma_table_header) {
+		unregister_sysctl_table(svcrdma_table_header);
+		svcrdma_table_header = NULL;
+	}
+	svc_unreg_xprt_class(&svc_rdma_class);
+}
+
+int svc_rdma_init(void)
+{
+	dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
+	dprintk("\tsvcrdma_ord      : %d\n", svcrdma_ord);
+	dprintk("\tmax_requests     : %d\n", svcrdma_max_requests);
+	dprintk("\tsq_depth         : %d\n",
+		svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT);
+	dprintk("\tmax_inline       : %d\n", svcrdma_max_req_size);
+	if (!svcrdma_table_header)
+		svcrdma_table_header =
+			register_sysctl_table(svcrdma_root_table);
+
+	/* Register RDMA with the SVC transport switch */
+	svc_reg_xprt_class(&svc_rdma_class);
+	return 0;
+}
+MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
+MODULE_DESCRIPTION("SVC RDMA Transport");
+MODULE_LICENSE("Dual BSD/GPL");
+module_init(svc_rdma_init);
+module_exit(svc_rdma_cleanup);
diff --git a/net/sunrpc/xprtrdma/svc_rdma_marshal.c b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
new file mode 100644
index 000000000000..9530ef2d40dc
--- /dev/null
+++ b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
@@ -0,0 +1,412 @@
+/*
+ * Copyright (c) 2005-2006 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/sunrpc/xdr.h>
+#include <linux/sunrpc/debug.h>
+#include <asm/unaligned.h>
+#include <linux/sunrpc/rpc_rdma.h>
+#include <linux/sunrpc/svc_rdma.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+/*
+ * Decodes a read chunk list. The expected format is as follows:
+ *    descrim  : xdr_one
+ *    position : u32 offset into XDR stream
+ *    handle   : u32 RKEY
+ *    . . .
+ *  end-of-list: xdr_zero
+ */
+static u32 *decode_read_list(u32 *va, u32 *vaend)
+{
+	struct rpcrdma_read_chunk *ch = (struct rpcrdma_read_chunk *)va;
+
+	while (ch->rc_discrim != xdr_zero) {
+		u64 ch_offset;
+
+		if (((unsigned long)ch + sizeof(struct rpcrdma_read_chunk)) >
+		    (unsigned long)vaend) {
+			dprintk("svcrdma: vaend=%p, ch=%p\n", vaend, ch);
+			return NULL;
+		}
+
+		ch->rc_discrim = ntohl(ch->rc_discrim);
+		ch->rc_position = ntohl(ch->rc_position);
+		ch->rc_target.rs_handle = ntohl(ch->rc_target.rs_handle);
+		ch->rc_target.rs_length = ntohl(ch->rc_target.rs_length);
+		va = (u32 *)&ch->rc_target.rs_offset;
+		xdr_decode_hyper(va, &ch_offset);
+		put_unaligned(ch_offset, (u64 *)va);
+		ch++;
+	}
+	return (u32 *)&ch->rc_position;
+}
+
+/*
+ * Determine number of chunks and total bytes in chunk list. The chunk
+ * list has already been verified to fit within the RPCRDMA header.
+ */
+void svc_rdma_rcl_chunk_counts(struct rpcrdma_read_chunk *ch,
+			       int *ch_count, int *byte_count)
+{
+	/* compute the number of bytes represented by read chunks */
+	*byte_count = 0;
+	*ch_count = 0;
+	for (; ch->rc_discrim != 0; ch++) {
+		*byte_count = *byte_count + ch->rc_target.rs_length;
+		*ch_count = *ch_count + 1;
+	}
+}
+
+/*
+ * Decodes a write chunk list. The expected format is as follows:
+ *    descrim  : xdr_one
+ *    nchunks  : <count>
+ *       handle   : u32 RKEY              ---+
+ *       length   : u32 <len of segment>     |
+ *       offset   : remove va                + <count>
+ *       . . .                               |
+ *                                        ---+
+ */
+static u32 *decode_write_list(u32 *va, u32 *vaend)
+{
+	int ch_no;
+	struct rpcrdma_write_array *ary =
+		(struct rpcrdma_write_array *)va;
+
+	/* Check for not write-array */
+	if (ary->wc_discrim == xdr_zero)
+		return (u32 *)&ary->wc_nchunks;
+
+	if ((unsigned long)ary + sizeof(struct rpcrdma_write_array) >
+	    (unsigned long)vaend) {
+		dprintk("svcrdma: ary=%p, vaend=%p\n", ary, vaend);
+		return NULL;
+	}
+	ary->wc_discrim = ntohl(ary->wc_discrim);
+	ary->wc_nchunks = ntohl(ary->wc_nchunks);
+	if (((unsigned long)&ary->wc_array[0] +
+	     (sizeof(struct rpcrdma_write_chunk) * ary->wc_nchunks)) >
+	    (unsigned long)vaend) {
+		dprintk("svcrdma: ary=%p, wc_nchunks=%d, vaend=%p\n",
+			ary, ary->wc_nchunks, vaend);
+		return NULL;
+	}
+	for (ch_no = 0; ch_no < ary->wc_nchunks; ch_no++) {
+		u64 ch_offset;
+
+		ary->wc_array[ch_no].wc_target.rs_handle =
+			ntohl(ary->wc_array[ch_no].wc_target.rs_handle);
+		ary->wc_array[ch_no].wc_target.rs_length =
+			ntohl(ary->wc_array[ch_no].wc_target.rs_length);
+		va = (u32 *)&ary->wc_array[ch_no].wc_target.rs_offset;
+		xdr_decode_hyper(va, &ch_offset);
+		put_unaligned(ch_offset, (u64 *)va);
+	}
+
+	/*
+	 * rs_length is the 2nd 4B field in wc_target and taking its
+	 * address skips the list terminator
+	 */
+	return (u32 *)&ary->wc_array[ch_no].wc_target.rs_length;
+}
+
+static u32 *decode_reply_array(u32 *va, u32 *vaend)
+{
+	int ch_no;
+	struct rpcrdma_write_array *ary =
+		(struct rpcrdma_write_array *)va;
+
+	/* Check for no reply-array */
+	if (ary->wc_discrim == xdr_zero)
+		return (u32 *)&ary->wc_nchunks;
+
+	if ((unsigned long)ary + sizeof(struct rpcrdma_write_array) >
+	    (unsigned long)vaend) {
+		dprintk("svcrdma: ary=%p, vaend=%p\n", ary, vaend);
+		return NULL;
+	}
+	ary->wc_discrim = ntohl(ary->wc_discrim);
+	ary->wc_nchunks = ntohl(ary->wc_nchunks);
+	if (((unsigned long)&ary->wc_array[0] +
+	     (sizeof(struct rpcrdma_write_chunk) * ary->wc_nchunks)) >
+	    (unsigned long)vaend) {
+		dprintk("svcrdma: ary=%p, wc_nchunks=%d, vaend=%p\n",
+			ary, ary->wc_nchunks, vaend);
+		return NULL;
+	}
+	for (ch_no = 0; ch_no < ary->wc_nchunks; ch_no++) {
+		u64 ch_offset;
+
+		ary->wc_array[ch_no].wc_target.rs_handle =
+			ntohl(ary->wc_array[ch_no].wc_target.rs_handle);
+		ary->wc_array[ch_no].wc_target.rs_length =
+			ntohl(ary->wc_array[ch_no].wc_target.rs_length);
+		va = (u32 *)&ary->wc_array[ch_no].wc_target.rs_offset;
+		xdr_decode_hyper(va, &ch_offset);
+		put_unaligned(ch_offset, (u64 *)va);
+	}
+
+	return (u32 *)&ary->wc_array[ch_no];
+}
+
+int svc_rdma_xdr_decode_req(struct rpcrdma_msg **rdma_req,
+			    struct svc_rqst *rqstp)
+{
+	struct rpcrdma_msg *rmsgp = NULL;
+	u32 *va;
+	u32 *vaend;
+	u32 hdr_len;
+
+	rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base;
+
+	/* Verify that there's enough bytes for header + something */
+	if (rqstp->rq_arg.len <= RPCRDMA_HDRLEN_MIN) {
+		dprintk("svcrdma: header too short = %d\n",
+			rqstp->rq_arg.len);
+		return -EINVAL;
+	}
+
+	/* Decode the header */
+	rmsgp->rm_xid = ntohl(rmsgp->rm_xid);
+	rmsgp->rm_vers = ntohl(rmsgp->rm_vers);
+	rmsgp->rm_credit = ntohl(rmsgp->rm_credit);
+	rmsgp->rm_type = ntohl(rmsgp->rm_type);
+
+	if (rmsgp->rm_vers != RPCRDMA_VERSION)
+		return -ENOSYS;
+
+	/* Pull in the extra for the padded case and bump our pointer */
+	if (rmsgp->rm_type == RDMA_MSGP) {
+		int hdrlen;
+		rmsgp->rm_body.rm_padded.rm_align =
+			ntohl(rmsgp->rm_body.rm_padded.rm_align);
+		rmsgp->rm_body.rm_padded.rm_thresh =
+			ntohl(rmsgp->rm_body.rm_padded.rm_thresh);
+
+		va = &rmsgp->rm_body.rm_padded.rm_pempty[4];
+		rqstp->rq_arg.head[0].iov_base = va;
+		hdrlen = (u32)((unsigned long)va - (unsigned long)rmsgp);
+		rqstp->rq_arg.head[0].iov_len -= hdrlen;
+		if (hdrlen > rqstp->rq_arg.len)
+			return -EINVAL;
+		return hdrlen;
+	}
+
+	/* The chunk list may contain either a read chunk list or a write
+	 * chunk list and a reply chunk list.
+	 */
+	va = &rmsgp->rm_body.rm_chunks[0];
+	vaend = (u32 *)((unsigned long)rmsgp + rqstp->rq_arg.len);
+	va = decode_read_list(va, vaend);
+	if (!va)
+		return -EINVAL;
+	va = decode_write_list(va, vaend);
+	if (!va)
+		return -EINVAL;
+	va = decode_reply_array(va, vaend);
+	if (!va)
+		return -EINVAL;
+
+	rqstp->rq_arg.head[0].iov_base = va;
+	hdr_len = (unsigned long)va - (unsigned long)rmsgp;
+	rqstp->rq_arg.head[0].iov_len -= hdr_len;
+
+	*rdma_req = rmsgp;
+	return hdr_len;
+}
+
+int svc_rdma_xdr_decode_deferred_req(struct svc_rqst *rqstp)
+{
+	struct rpcrdma_msg *rmsgp = NULL;
+	struct rpcrdma_read_chunk *ch;
+	struct rpcrdma_write_array *ary;
+	u32 *va;
+	u32 hdrlen;
+
+	dprintk("svcrdma: processing deferred RDMA header on rqstp=%p\n",
+		rqstp);
+	rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base;
+
+	/* Pull in the extra for the padded case and bump our pointer */
+	if (rmsgp->rm_type == RDMA_MSGP) {
+		va = &rmsgp->rm_body.rm_padded.rm_pempty[4];
+		rqstp->rq_arg.head[0].iov_base = va;
+		hdrlen = (u32)((unsigned long)va - (unsigned long)rmsgp);
+		rqstp->rq_arg.head[0].iov_len -= hdrlen;
+		return hdrlen;
+	}
+
+	/*
+	 * Skip all chunks to find RPC msg. These were previously processed
+	 */
+	va = &rmsgp->rm_body.rm_chunks[0];
+
+	/* Skip read-list */
+	for (ch = (struct rpcrdma_read_chunk *)va;
+	     ch->rc_discrim != xdr_zero; ch++);
+	va = (u32 *)&ch->rc_position;
+
+	/* Skip write-list */
+	ary = (struct rpcrdma_write_array *)va;
+	if (ary->wc_discrim == xdr_zero)
+		va = (u32 *)&ary->wc_nchunks;
+	else
+		/*
+		 * rs_length is the 2nd 4B field in wc_target and taking its
+		 * address skips the list terminator
+		 */
+		va = (u32 *)&ary->wc_array[ary->wc_nchunks].wc_target.rs_length;
+
+	/* Skip reply-array */
+	ary = (struct rpcrdma_write_array *)va;
+	if (ary->wc_discrim == xdr_zero)
+		va = (u32 *)&ary->wc_nchunks;
+	else
+		va = (u32 *)&ary->wc_array[ary->wc_nchunks];
+
+	rqstp->rq_arg.head[0].iov_base = va;
+	hdrlen = (unsigned long)va - (unsigned long)rmsgp;
+	rqstp->rq_arg.head[0].iov_len -= hdrlen;
+
+	return hdrlen;
+}
+
+int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt,
+			      struct rpcrdma_msg *rmsgp,
+			      enum rpcrdma_errcode err, u32 *va)
+{
+	u32 *startp = va;
+
+	*va++ = htonl(rmsgp->rm_xid);
+	*va++ = htonl(rmsgp->rm_vers);
+	*va++ = htonl(xprt->sc_max_requests);
+	*va++ = htonl(RDMA_ERROR);
+	*va++ = htonl(err);
+	if (err == ERR_VERS) {
+		*va++ = htonl(RPCRDMA_VERSION);
+		*va++ = htonl(RPCRDMA_VERSION);
+	}
+
+	return (int)((unsigned long)va - (unsigned long)startp);
+}
+
+int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *rmsgp)
+{
+	struct rpcrdma_write_array *wr_ary;
+
+	/* There is no read-list in a reply */
+
+	/* skip write list */
+	wr_ary = (struct rpcrdma_write_array *)
+		&rmsgp->rm_body.rm_chunks[1];
+	if (wr_ary->wc_discrim)
+		wr_ary = (struct rpcrdma_write_array *)
+			&wr_ary->wc_array[ntohl(wr_ary->wc_nchunks)].
+			wc_target.rs_length;
+	else
+		wr_ary = (struct rpcrdma_write_array *)
+			&wr_ary->wc_nchunks;
+
+	/* skip reply array */
+	if (wr_ary->wc_discrim)
+		wr_ary = (struct rpcrdma_write_array *)
+			&wr_ary->wc_array[ntohl(wr_ary->wc_nchunks)];
+	else
+		wr_ary = (struct rpcrdma_write_array *)
+			&wr_ary->wc_nchunks;
+
+	return (unsigned long) wr_ary - (unsigned long) rmsgp;
+}
+
+void svc_rdma_xdr_encode_write_list(struct rpcrdma_msg *rmsgp, int chunks)
+{
+	struct rpcrdma_write_array *ary;
+
+	/* no read-list */
+	rmsgp->rm_body.rm_chunks[0] = xdr_zero;
+
+	/* write-array discrim */
+	ary = (struct rpcrdma_write_array *)
+		&rmsgp->rm_body.rm_chunks[1];
+	ary->wc_discrim = xdr_one;
+	ary->wc_nchunks = htonl(chunks);
+
+	/* write-list terminator */
+	ary->wc_array[chunks].wc_target.rs_handle = xdr_zero;
+
+	/* reply-array discriminator */
+	ary->wc_array[chunks].wc_target.rs_length = xdr_zero;
+}
+
+void svc_rdma_xdr_encode_reply_array(struct rpcrdma_write_array *ary,
+				 int chunks)
+{
+	ary->wc_discrim = xdr_one;
+	ary->wc_nchunks = htonl(chunks);
+}
+
+void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *ary,
+				     int chunk_no,
+				     u32 rs_handle, u64 rs_offset,
+				     u32 write_len)
+{
+	struct rpcrdma_segment *seg = &ary->wc_array[chunk_no].wc_target;
+	seg->rs_handle = htonl(rs_handle);
+	seg->rs_length = htonl(write_len);
+	xdr_encode_hyper((u32 *) &seg->rs_offset, rs_offset);
+}
+
+void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *xprt,
+				  struct rpcrdma_msg *rdma_argp,
+				  struct rpcrdma_msg *rdma_resp,
+				  enum rpcrdma_proc rdma_type)
+{
+	rdma_resp->rm_xid = htonl(rdma_argp->rm_xid);
+	rdma_resp->rm_vers = htonl(rdma_argp->rm_vers);
+	rdma_resp->rm_credit = htonl(xprt->sc_max_requests);
+	rdma_resp->rm_type = htonl(rdma_type);
+
+	/* Encode <nul> chunks lists */
+	rdma_resp->rm_body.rm_chunks[0] = xdr_zero;
+	rdma_resp->rm_body.rm_chunks[1] = xdr_zero;
+	rdma_resp->rm_body.rm_chunks[2] = xdr_zero;
+}
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
new file mode 100644
index 000000000000..ab54a736486e
--- /dev/null
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -0,0 +1,586 @@
+/*
+ * Copyright (c) 2005-2006 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/sunrpc/debug.h>
+#include <linux/sunrpc/rpc_rdma.h>
+#include <linux/spinlock.h>
+#include <asm/unaligned.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <linux/sunrpc/svc_rdma.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+/*
+ * Replace the pages in the rq_argpages array with the pages from the SGE in
+ * the RDMA_RECV completion. The SGL should contain full pages up until the
+ * last one.
+ */
+static void rdma_build_arg_xdr(struct svc_rqst *rqstp,
+			       struct svc_rdma_op_ctxt *ctxt,
+			       u32 byte_count)
+{
+	struct page *page;
+	u32 bc;
+	int sge_no;
+
+	/* Swap the page in the SGE with the page in argpages */
+	page = ctxt->pages[0];
+	put_page(rqstp->rq_pages[0]);
+	rqstp->rq_pages[0] = page;
+
+	/* Set up the XDR head */
+	rqstp->rq_arg.head[0].iov_base = page_address(page);
+	rqstp->rq_arg.head[0].iov_len = min(byte_count, ctxt->sge[0].length);
+	rqstp->rq_arg.len = byte_count;
+	rqstp->rq_arg.buflen = byte_count;
+
+	/* Compute bytes past head in the SGL */
+	bc = byte_count - rqstp->rq_arg.head[0].iov_len;
+
+	/* If data remains, store it in the pagelist */
+	rqstp->rq_arg.page_len = bc;
+	rqstp->rq_arg.page_base = 0;
+	rqstp->rq_arg.pages = &rqstp->rq_pages[1];
+	sge_no = 1;
+	while (bc && sge_no < ctxt->count) {
+		page = ctxt->pages[sge_no];
+		put_page(rqstp->rq_pages[sge_no]);
+		rqstp->rq_pages[sge_no] = page;
+		bc -= min(bc, ctxt->sge[sge_no].length);
+		rqstp->rq_arg.buflen += ctxt->sge[sge_no].length;
+		sge_no++;
+	}
+	rqstp->rq_respages = &rqstp->rq_pages[sge_no];
+
+	/* We should never run out of SGE because the limit is defined to
+	 * support the max allowed RPC data length
+	 */
+	BUG_ON(bc && (sge_no == ctxt->count));
+	BUG_ON((rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len)
+	       != byte_count);
+	BUG_ON(rqstp->rq_arg.len != byte_count);
+
+	/* If not all pages were used from the SGL, free the remaining ones */
+	bc = sge_no;
+	while (sge_no < ctxt->count) {
+		page = ctxt->pages[sge_no++];
+		put_page(page);
+	}
+	ctxt->count = bc;
+
+	/* Set up tail */
+	rqstp->rq_arg.tail[0].iov_base = NULL;
+	rqstp->rq_arg.tail[0].iov_len = 0;
+}
+
+struct chunk_sge {
+	int start;		/* sge no for this chunk */
+	int count;		/* sge count for this chunk */
+};
+
+/* Encode a read-chunk-list as an array of IB SGE
+ *
+ * Assumptions:
+ * - chunk[0]->position points to pages[0] at an offset of 0
+ * - pages[] is not physically or virtually contigous and consists of
+ *   PAGE_SIZE elements.
+ *
+ * Output:
+ * - sge array pointing into pages[] array.
+ * - chunk_sge array specifying sge index and count for each
+ *   chunk in the read list
+ *
+ */
+static int rdma_rcl_to_sge(struct svcxprt_rdma *xprt,
+			   struct svc_rqst *rqstp,
+			   struct svc_rdma_op_ctxt *head,
+			   struct rpcrdma_msg *rmsgp,
+			   struct ib_sge *sge,
+			   struct chunk_sge *ch_sge_ary,
+			   int ch_count,
+			   int byte_count)
+{
+	int sge_no;
+	int sge_bytes;
+	int page_off;
+	int page_no;
+	int ch_bytes;
+	int ch_no;
+	struct rpcrdma_read_chunk *ch;
+
+	sge_no = 0;
+	page_no = 0;
+	page_off = 0;
+	ch = (struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
+	ch_no = 0;
+	ch_bytes = ch->rc_target.rs_length;
+	head->arg.head[0] = rqstp->rq_arg.head[0];
+	head->arg.tail[0] = rqstp->rq_arg.tail[0];
+	head->arg.pages = &head->pages[head->count];
+	head->sge[0].length = head->count; /* save count of hdr pages */
+	head->arg.page_base = 0;
+	head->arg.page_len = ch_bytes;
+	head->arg.len = rqstp->rq_arg.len + ch_bytes;
+	head->arg.buflen = rqstp->rq_arg.buflen + ch_bytes;
+	head->count++;
+	ch_sge_ary[0].start = 0;
+	while (byte_count) {
+		sge_bytes = min_t(int, PAGE_SIZE-page_off, ch_bytes);
+		sge[sge_no].addr =
+			ib_dma_map_page(xprt->sc_cm_id->device,
+					rqstp->rq_arg.pages[page_no],
+					page_off, sge_bytes,
+					DMA_FROM_DEVICE);
+		sge[sge_no].length = sge_bytes;
+		sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
+		/*
+		 * Don't bump head->count here because the same page
+		 * may be used by multiple SGE.
+		 */
+		head->arg.pages[page_no] = rqstp->rq_arg.pages[page_no];
+		rqstp->rq_respages = &rqstp->rq_arg.pages[page_no+1];
+
+		byte_count -= sge_bytes;
+		ch_bytes -= sge_bytes;
+		sge_no++;
+		/*
+		 * If all bytes for this chunk have been mapped to an
+		 * SGE, move to the next SGE
+		 */
+		if (ch_bytes == 0) {
+			ch_sge_ary[ch_no].count =
+				sge_no - ch_sge_ary[ch_no].start;
+			ch_no++;
+			ch++;
+			ch_sge_ary[ch_no].start = sge_no;
+			ch_bytes = ch->rc_target.rs_length;
+			/* If bytes remaining account for next chunk */
+			if (byte_count) {
+				head->arg.page_len += ch_bytes;
+				head->arg.len += ch_bytes;
+				head->arg.buflen += ch_bytes;
+			}
+		}
+		/*
+		 * If this SGE consumed all of the page, move to the
+		 * next page
+		 */
+		if ((sge_bytes + page_off) == PAGE_SIZE) {
+			page_no++;
+			page_off = 0;
+			/*
+			 * If there are still bytes left to map, bump
+			 * the page count
+			 */
+			if (byte_count)
+				head->count++;
+		} else
+			page_off += sge_bytes;
+	}
+	BUG_ON(byte_count != 0);
+	return sge_no;
+}
+
+static void rdma_set_ctxt_sge(struct svc_rdma_op_ctxt *ctxt,
+			      struct ib_sge *sge,
+			      u64 *sgl_offset,
+			      int count)
+{
+	int i;
+
+	ctxt->count = count;
+	for (i = 0; i < count; i++) {
+		ctxt->sge[i].addr = sge[i].addr;
+		ctxt->sge[i].length = sge[i].length;
+		*sgl_offset = *sgl_offset + sge[i].length;
+	}
+}
+
+static int rdma_read_max_sge(struct svcxprt_rdma *xprt, int sge_count)
+{
+#ifdef RDMA_TRANSPORT_IWARP
+	if ((RDMA_TRANSPORT_IWARP ==
+	     rdma_node_get_transport(xprt->sc_cm_id->
+				     device->node_type))
+	    && sge_count > 1)
+		return 1;
+	else
+#endif
+		return min_t(int, sge_count, xprt->sc_max_sge);
+}
+
+/*
+ * Use RDMA_READ to read data from the advertised client buffer into the
+ * XDR stream starting at rq_arg.head[0].iov_base.
+ * Each chunk in the array
+ * contains the following fields:
+ * discrim      - '1', This isn't used for data placement
+ * position     - The xdr stream offset (the same for every chunk)
+ * handle       - RMR for client memory region
+ * length       - data transfer length
+ * offset       - 64 bit tagged offset in remote memory region
+ *
+ * On our side, we need to read into a pagelist. The first page immediately
+ * follows the RPC header.
+ *
+ * This function returns 1 to indicate success. The data is not yet in
+ * the pagelist and therefore the RPC request must be deferred. The
+ * I/O completion will enqueue the transport again and
+ * svc_rdma_recvfrom will complete the request.
+ *
+ * NOTE: The ctxt must not be touched after the last WR has been posted
+ * because the I/O completion processing may occur on another
+ * processor and free / modify the context. Ne touche pas!
+ */
+static int rdma_read_xdr(struct svcxprt_rdma *xprt,
+			 struct rpcrdma_msg *rmsgp,
+			 struct svc_rqst *rqstp,
+			 struct svc_rdma_op_ctxt *hdr_ctxt)
+{
+	struct ib_send_wr read_wr;
+	int err = 0;
+	int ch_no;
+	struct ib_sge *sge;
+	int ch_count;
+	int byte_count;
+	int sge_count;
+	u64 sgl_offset;
+	struct rpcrdma_read_chunk *ch;
+	struct svc_rdma_op_ctxt *ctxt = NULL;
+	struct svc_rdma_op_ctxt *head;
+	struct svc_rdma_op_ctxt *tmp_sge_ctxt;
+	struct svc_rdma_op_ctxt *tmp_ch_ctxt;
+	struct chunk_sge *ch_sge_ary;
+
+	/* If no read list is present, return 0 */
+	ch = svc_rdma_get_read_chunk(rmsgp);
+	if (!ch)
+		return 0;
+
+	/* Allocate temporary contexts to keep SGE */
+	BUG_ON(sizeof(struct ib_sge) < sizeof(struct chunk_sge));
+	tmp_sge_ctxt = svc_rdma_get_context(xprt);
+	sge = tmp_sge_ctxt->sge;
+	tmp_ch_ctxt = svc_rdma_get_context(xprt);
+	ch_sge_ary = (struct chunk_sge *)tmp_ch_ctxt->sge;
+
+	svc_rdma_rcl_chunk_counts(ch, &ch_count, &byte_count);
+	sge_count = rdma_rcl_to_sge(xprt, rqstp, hdr_ctxt, rmsgp,
+				    sge, ch_sge_ary,
+				    ch_count, byte_count);
+	head = svc_rdma_get_context(xprt);
+	sgl_offset = 0;
+	ch_no = 0;
+
+	for (ch = (struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
+	     ch->rc_discrim != 0; ch++, ch_no++) {
+next_sge:
+		if (!ctxt)
+			ctxt = head;
+		else {
+			ctxt->next = svc_rdma_get_context(xprt);
+			ctxt = ctxt->next;
+		}
+		ctxt->next = NULL;
+		ctxt->direction = DMA_FROM_DEVICE;
+		clear_bit(RDMACTXT_F_READ_DONE, &ctxt->flags);
+		clear_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
+		if ((ch+1)->rc_discrim == 0) {
+			/*
+			 * Checked in sq_cq_reap to see if we need to
+			 * be enqueued
+			 */
+			set_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
+			ctxt->next = hdr_ctxt;
+			hdr_ctxt->next = head;
+		}
+
+		/* Prepare READ WR */
+		memset(&read_wr, 0, sizeof read_wr);
+		ctxt->wr_op = IB_WR_RDMA_READ;
+		read_wr.wr_id = (unsigned long)ctxt;
+		read_wr.opcode = IB_WR_RDMA_READ;
+		read_wr.send_flags = IB_SEND_SIGNALED;
+		read_wr.wr.rdma.rkey = ch->rc_target.rs_handle;
+		read_wr.wr.rdma.remote_addr =
+			get_unaligned(&(ch->rc_target.rs_offset)) +
+			sgl_offset;
+		read_wr.sg_list = &sge[ch_sge_ary[ch_no].start];
+		read_wr.num_sge =
+			rdma_read_max_sge(xprt, ch_sge_ary[ch_no].count);
+		rdma_set_ctxt_sge(ctxt, &sge[ch_sge_ary[ch_no].start],
+				  &sgl_offset,
+				  read_wr.num_sge);
+
+		/* Post the read */
+		err = svc_rdma_send(xprt, &read_wr);
+		if (err) {
+			printk(KERN_ERR "svcrdma: Error posting send = %d\n",
+			       err);
+			/*
+			 * Break the circular list so free knows when
+			 * to stop if the error happened to occur on
+			 * the last read
+			 */
+			ctxt->next = NULL;
+			goto out;
+		}
+		atomic_inc(&rdma_stat_read);
+
+		if (read_wr.num_sge < ch_sge_ary[ch_no].count) {
+			ch_sge_ary[ch_no].count -= read_wr.num_sge;
+			ch_sge_ary[ch_no].start += read_wr.num_sge;
+			goto next_sge;
+		}
+		sgl_offset = 0;
+		err = 0;
+	}
+
+ out:
+	svc_rdma_put_context(tmp_sge_ctxt, 0);
+	svc_rdma_put_context(tmp_ch_ctxt, 0);
+
+	/* Detach arg pages. svc_recv will replenish them */
+	for (ch_no = 0; &rqstp->rq_pages[ch_no] < rqstp->rq_respages; ch_no++)
+		rqstp->rq_pages[ch_no] = NULL;
+
+	/*
+	 * Detach res pages. svc_release must see a resused count of
+	 * zero or it will attempt to put them.
+	 */
+	while (rqstp->rq_resused)
+		rqstp->rq_respages[--rqstp->rq_resused] = NULL;
+
+	if (err) {
+		printk(KERN_ERR "svcrdma : RDMA_READ error = %d\n", err);
+		set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+		/* Free the linked list of read contexts */
+		while (head != NULL) {
+			ctxt = head->next;
+			svc_rdma_put_context(head, 1);
+			head = ctxt;
+		}
+		return 0;
+	}
+
+	return 1;
+}
+
+static int rdma_read_complete(struct svc_rqst *rqstp,
+			      struct svc_rdma_op_ctxt *data)
+{
+	struct svc_rdma_op_ctxt *head = data->next;
+	int page_no;
+	int ret;
+
+	BUG_ON(!head);
+
+	/* Copy RPC pages */
+	for (page_no = 0; page_no < head->count; page_no++) {
+		put_page(rqstp->rq_pages[page_no]);
+		rqstp->rq_pages[page_no] = head->pages[page_no];
+	}
+	/* Point rq_arg.pages past header */
+	rqstp->rq_arg.pages = &rqstp->rq_pages[head->sge[0].length];
+	rqstp->rq_arg.page_len = head->arg.page_len;
+	rqstp->rq_arg.page_base = head->arg.page_base;
+
+	/* rq_respages starts after the last arg page */
+	rqstp->rq_respages = &rqstp->rq_arg.pages[page_no];
+	rqstp->rq_resused = 0;
+
+	/* Rebuild rq_arg head and tail. */
+	rqstp->rq_arg.head[0] = head->arg.head[0];
+	rqstp->rq_arg.tail[0] = head->arg.tail[0];
+	rqstp->rq_arg.len = head->arg.len;
+	rqstp->rq_arg.buflen = head->arg.buflen;
+
+	/* XXX: What should this be? */
+	rqstp->rq_prot = IPPROTO_MAX;
+
+	/*
+	 * Free the contexts we used to build the RDMA_READ. We have
+	 * to be careful here because the context list uses the same
+	 * next pointer used to chain the contexts associated with the
+	 * RDMA_READ
+	 */
+	data->next = NULL;	/* terminate circular list */
+	do {
+		data = head->next;
+		svc_rdma_put_context(head, 0);
+		head = data;
+	} while (head != NULL);
+
+	ret = rqstp->rq_arg.head[0].iov_len
+		+ rqstp->rq_arg.page_len
+		+ rqstp->rq_arg.tail[0].iov_len;
+	dprintk("svcrdma: deferred read ret=%d, rq_arg.len =%d, "
+		"rq_arg.head[0].iov_base=%p, rq_arg.head[0].iov_len = %zd\n",
+		ret, rqstp->rq_arg.len,	rqstp->rq_arg.head[0].iov_base,
+		rqstp->rq_arg.head[0].iov_len);
+
+	/* Indicate that we've consumed an RQ credit */
+	rqstp->rq_xprt_ctxt = rqstp->rq_xprt;
+	svc_xprt_received(rqstp->rq_xprt);
+	return ret;
+}
+
+/*
+ * Set up the rqstp thread context to point to the RQ buffer. If
+ * necessary, pull additional data from the client with an RDMA_READ
+ * request.
+ */
+int svc_rdma_recvfrom(struct svc_rqst *rqstp)
+{
+	struct svc_xprt *xprt = rqstp->rq_xprt;
+	struct svcxprt_rdma *rdma_xprt =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+	struct svc_rdma_op_ctxt *ctxt = NULL;
+	struct rpcrdma_msg *rmsgp;
+	int ret = 0;
+	int len;
+
+	dprintk("svcrdma: rqstp=%p\n", rqstp);
+
+	/*
+	 * The rq_xprt_ctxt indicates if we've consumed an RQ credit
+	 * or not. It is used in the rdma xpo_release_rqst function to
+	 * determine whether or not to return an RQ WQE to the RQ.
+	 */
+	rqstp->rq_xprt_ctxt = NULL;
+
+	spin_lock_bh(&rdma_xprt->sc_read_complete_lock);
+	if (!list_empty(&rdma_xprt->sc_read_complete_q)) {
+		ctxt = list_entry(rdma_xprt->sc_read_complete_q.next,
+				  struct svc_rdma_op_ctxt,
+				  dto_q);
+		list_del_init(&ctxt->dto_q);
+	}
+	spin_unlock_bh(&rdma_xprt->sc_read_complete_lock);
+	if (ctxt)
+		return rdma_read_complete(rqstp, ctxt);
+
+	spin_lock_bh(&rdma_xprt->sc_rq_dto_lock);
+	if (!list_empty(&rdma_xprt->sc_rq_dto_q)) {
+		ctxt = list_entry(rdma_xprt->sc_rq_dto_q.next,
+				  struct svc_rdma_op_ctxt,
+				  dto_q);
+		list_del_init(&ctxt->dto_q);
+	} else {
+		atomic_inc(&rdma_stat_rq_starve);
+		clear_bit(XPT_DATA, &xprt->xpt_flags);
+		ctxt = NULL;
+	}
+	spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
+	if (!ctxt) {
+		/* This is the EAGAIN path. The svc_recv routine will
+		 * return -EAGAIN, the nfsd thread will go to call into
+		 * svc_recv again and we shouldn't be on the active
+		 * transport list
+		 */
+		if (test_bit(XPT_CLOSE, &xprt->xpt_flags))
+			goto close_out;
+
+		BUG_ON(ret);
+		goto out;
+	}
+	dprintk("svcrdma: processing ctxt=%p on xprt=%p, rqstp=%p, status=%d\n",
+		ctxt, rdma_xprt, rqstp, ctxt->wc_status);
+	BUG_ON(ctxt->wc_status != IB_WC_SUCCESS);
+	atomic_inc(&rdma_stat_recv);
+
+	/* Build up the XDR from the receive buffers. */
+	rdma_build_arg_xdr(rqstp, ctxt, ctxt->byte_len);
+
+	/* Decode the RDMA header. */
+	len = svc_rdma_xdr_decode_req(&rmsgp, rqstp);
+	rqstp->rq_xprt_hlen = len;
+
+	/* If the request is invalid, reply with an error */
+	if (len < 0) {
+		if (len == -ENOSYS)
+			(void)svc_rdma_send_error(rdma_xprt, rmsgp, ERR_VERS);
+		goto close_out;
+	}
+
+	/* Read read-list data. If we would need to wait, defer
+	 * it. Not that in this case, we don't return the RQ credit
+	 * until after the read completes.
+	 */
+	if (rdma_read_xdr(rdma_xprt, rmsgp, rqstp, ctxt)) {
+		svc_xprt_received(xprt);
+		return 0;
+	}
+
+	/* Indicate we've consumed an RQ credit */
+	rqstp->rq_xprt_ctxt = rqstp->rq_xprt;
+
+	ret = rqstp->rq_arg.head[0].iov_len
+		+ rqstp->rq_arg.page_len
+		+ rqstp->rq_arg.tail[0].iov_len;
+	svc_rdma_put_context(ctxt, 0);
+ out:
+	dprintk("svcrdma: ret = %d, rq_arg.len =%d, "
+		"rq_arg.head[0].iov_base=%p, rq_arg.head[0].iov_len = %zd\n",
+		ret, rqstp->rq_arg.len,
+		rqstp->rq_arg.head[0].iov_base,
+		rqstp->rq_arg.head[0].iov_len);
+	rqstp->rq_prot = IPPROTO_MAX;
+	svc_xprt_copy_addrs(rqstp, xprt);
+	svc_xprt_received(xprt);
+	return ret;
+
+ close_out:
+	if (ctxt) {
+		svc_rdma_put_context(ctxt, 1);
+		/* Indicate we've consumed an RQ credit */
+		rqstp->rq_xprt_ctxt = rqstp->rq_xprt;
+	}
+	dprintk("svcrdma: transport %p is closing\n", xprt);
+	/*
+	 * Set the close bit and enqueue it. svc_recv will see the
+	 * close bit and call svc_xprt_delete
+	 */
+	set_bit(XPT_CLOSE, &xprt->xpt_flags);
+	svc_xprt_received(xprt);
+	return 0;
+}
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
new file mode 100644
index 000000000000..3e321949e1dc
--- /dev/null
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -0,0 +1,520 @@
+/*
+ * Copyright (c) 2005-2006 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/sunrpc/debug.h>
+#include <linux/sunrpc/rpc_rdma.h>
+#include <linux/spinlock.h>
+#include <asm/unaligned.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <linux/sunrpc/svc_rdma.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+/* Encode an XDR as an array of IB SGE
+ *
+ * Assumptions:
+ * - head[0] is physically contiguous.
+ * - tail[0] is physically contiguous.
+ * - pages[] is not physically or virtually contigous and consists of
+ *   PAGE_SIZE elements.
+ *
+ * Output:
+ * SGE[0]              reserved for RCPRDMA header
+ * SGE[1]              data from xdr->head[]
+ * SGE[2..sge_count-2] data from xdr->pages[]
+ * SGE[sge_count-1]    data from xdr->tail.
+ *
+ */
+static struct ib_sge *xdr_to_sge(struct svcxprt_rdma *xprt,
+				 struct xdr_buf *xdr,
+				 struct ib_sge *sge,
+				 int *sge_count)
+{
+	/* Max we need is the length of the XDR / pagesize + one for
+	 * head + one for tail + one for RPCRDMA header
+	 */
+	int sge_max = (xdr->len+PAGE_SIZE-1) / PAGE_SIZE + 3;
+	int sge_no;
+	u32 byte_count = xdr->len;
+	u32 sge_bytes;
+	u32 page_bytes;
+	int page_off;
+	int page_no;
+
+	/* Skip the first sge, this is for the RPCRDMA header */
+	sge_no = 1;
+
+	/* Head SGE */
+	sge[sge_no].addr = ib_dma_map_single(xprt->sc_cm_id->device,
+					     xdr->head[0].iov_base,
+					     xdr->head[0].iov_len,
+					     DMA_TO_DEVICE);
+	sge_bytes = min_t(u32, byte_count, xdr->head[0].iov_len);
+	byte_count -= sge_bytes;
+	sge[sge_no].length = sge_bytes;
+	sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
+	sge_no++;
+
+	/* pages SGE */
+	page_no = 0;
+	page_bytes = xdr->page_len;
+	page_off = xdr->page_base;
+	while (byte_count && page_bytes) {
+		sge_bytes = min_t(u32, byte_count, (PAGE_SIZE-page_off));
+		sge[sge_no].addr =
+			ib_dma_map_page(xprt->sc_cm_id->device,
+					xdr->pages[page_no], page_off,
+					sge_bytes, DMA_TO_DEVICE);
+		sge_bytes = min(sge_bytes, page_bytes);
+		byte_count -= sge_bytes;
+		page_bytes -= sge_bytes;
+		sge[sge_no].length = sge_bytes;
+		sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
+
+		sge_no++;
+		page_no++;
+		page_off = 0; /* reset for next time through loop */
+	}
+
+	/* Tail SGE */
+	if (byte_count && xdr->tail[0].iov_len) {
+		sge[sge_no].addr =
+			ib_dma_map_single(xprt->sc_cm_id->device,
+					  xdr->tail[0].iov_base,
+					  xdr->tail[0].iov_len,
+					  DMA_TO_DEVICE);
+		sge_bytes = min_t(u32, byte_count, xdr->tail[0].iov_len);
+		byte_count -= sge_bytes;
+		sge[sge_no].length = sge_bytes;
+		sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
+		sge_no++;
+	}
+
+	BUG_ON(sge_no > sge_max);
+	BUG_ON(byte_count != 0);
+
+	*sge_count = sge_no;
+	return sge;
+}
+
+
+/* Assumptions:
+ * - The specified write_len can be represented in sc_max_sge * PAGE_SIZE
+ */
+static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
+		      u32 rmr, u64 to,
+		      u32 xdr_off, int write_len,
+		      struct ib_sge *xdr_sge, int sge_count)
+{
+	struct svc_rdma_op_ctxt *tmp_sge_ctxt;
+	struct ib_send_wr write_wr;
+	struct ib_sge *sge;
+	int xdr_sge_no;
+	int sge_no;
+	int sge_bytes;
+	int sge_off;
+	int bc;
+	struct svc_rdma_op_ctxt *ctxt;
+	int ret = 0;
+
+	BUG_ON(sge_count >= 32);
+	dprintk("svcrdma: RDMA_WRITE rmr=%x, to=%llx, xdr_off=%d, "
+		"write_len=%d, xdr_sge=%p, sge_count=%d\n",
+		rmr, to, xdr_off, write_len, xdr_sge, sge_count);
+
+	ctxt = svc_rdma_get_context(xprt);
+	ctxt->count = 0;
+	tmp_sge_ctxt = svc_rdma_get_context(xprt);
+	sge = tmp_sge_ctxt->sge;
+
+	/* Find the SGE associated with xdr_off */
+	for (bc = xdr_off, xdr_sge_no = 1; bc && xdr_sge_no < sge_count;
+	     xdr_sge_no++) {
+		if (xdr_sge[xdr_sge_no].length > bc)
+			break;
+		bc -= xdr_sge[xdr_sge_no].length;
+	}
+
+	sge_off = bc;
+	bc = write_len;
+	sge_no = 0;
+
+	/* Copy the remaining SGE */
+	while (bc != 0 && xdr_sge_no < sge_count) {
+		sge[sge_no].addr = xdr_sge[xdr_sge_no].addr + sge_off;
+		sge[sge_no].lkey = xdr_sge[xdr_sge_no].lkey;
+		sge_bytes = min((size_t)bc,
+				(size_t)(xdr_sge[xdr_sge_no].length-sge_off));
+		sge[sge_no].length = sge_bytes;
+
+		sge_off = 0;
+		sge_no++;
+		xdr_sge_no++;
+		bc -= sge_bytes;
+	}
+
+	BUG_ON(bc != 0);
+	BUG_ON(xdr_sge_no > sge_count);
+
+	/* Prepare WRITE WR */
+	memset(&write_wr, 0, sizeof write_wr);
+	ctxt->wr_op = IB_WR_RDMA_WRITE;
+	write_wr.wr_id = (unsigned long)ctxt;
+	write_wr.sg_list = &sge[0];
+	write_wr.num_sge = sge_no;
+	write_wr.opcode = IB_WR_RDMA_WRITE;
+	write_wr.send_flags = IB_SEND_SIGNALED;
+	write_wr.wr.rdma.rkey = rmr;
+	write_wr.wr.rdma.remote_addr = to;
+
+	/* Post It */
+	atomic_inc(&rdma_stat_write);
+	if (svc_rdma_send(xprt, &write_wr)) {
+		svc_rdma_put_context(ctxt, 1);
+		/* Fatal error, close transport */
+		ret = -EIO;
+	}
+	svc_rdma_put_context(tmp_sge_ctxt, 0);
+	return ret;
+}
+
+static int send_write_chunks(struct svcxprt_rdma *xprt,
+			     struct rpcrdma_msg *rdma_argp,
+			     struct rpcrdma_msg *rdma_resp,
+			     struct svc_rqst *rqstp,
+			     struct ib_sge *sge,
+			     int sge_count)
+{
+	u32 xfer_len = rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len;
+	int write_len;
+	int max_write;
+	u32 xdr_off;
+	int chunk_off;
+	int chunk_no;
+	struct rpcrdma_write_array *arg_ary;
+	struct rpcrdma_write_array *res_ary;
+	int ret;
+
+	arg_ary = svc_rdma_get_write_array(rdma_argp);
+	if (!arg_ary)
+		return 0;
+	res_ary = (struct rpcrdma_write_array *)
+		&rdma_resp->rm_body.rm_chunks[1];
+
+	max_write = xprt->sc_max_sge * PAGE_SIZE;
+
+	/* Write chunks start at the pagelist */
+	for (xdr_off = rqstp->rq_res.head[0].iov_len, chunk_no = 0;
+	     xfer_len && chunk_no < arg_ary->wc_nchunks;
+	     chunk_no++) {
+		struct rpcrdma_segment *arg_ch;
+		u64 rs_offset;
+
+		arg_ch = &arg_ary->wc_array[chunk_no].wc_target;
+		write_len = min(xfer_len, arg_ch->rs_length);
+
+		/* Prepare the response chunk given the length actually
+		 * written */
+		rs_offset = get_unaligned(&(arg_ch->rs_offset));
+		svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no,
+					    arg_ch->rs_handle,
+					    rs_offset,
+					    write_len);
+		chunk_off = 0;
+		while (write_len) {
+			int this_write;
+			this_write = min(write_len, max_write);
+			ret = send_write(xprt, rqstp,
+					 arg_ch->rs_handle,
+					 rs_offset + chunk_off,
+					 xdr_off,
+					 this_write,
+					 sge,
+					 sge_count);
+			if (ret) {
+				dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
+					ret);
+				return -EIO;
+			}
+			chunk_off += this_write;
+			xdr_off += this_write;
+			xfer_len -= this_write;
+			write_len -= this_write;
+		}
+	}
+	/* Update the req with the number of chunks actually used */
+	svc_rdma_xdr_encode_write_list(rdma_resp, chunk_no);
+
+	return rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len;
+}
+
+static int send_reply_chunks(struct svcxprt_rdma *xprt,
+			     struct rpcrdma_msg *rdma_argp,
+			     struct rpcrdma_msg *rdma_resp,
+			     struct svc_rqst *rqstp,
+			     struct ib_sge *sge,
+			     int sge_count)
+{
+	u32 xfer_len = rqstp->rq_res.len;
+	int write_len;
+	int max_write;
+	u32 xdr_off;
+	int chunk_no;
+	int chunk_off;
+	struct rpcrdma_segment *ch;
+	struct rpcrdma_write_array *arg_ary;
+	struct rpcrdma_write_array *res_ary;
+	int ret;
+
+	arg_ary = svc_rdma_get_reply_array(rdma_argp);
+	if (!arg_ary)
+		return 0;
+	/* XXX: need to fix when reply lists occur with read-list and or
+	 * write-list */
+	res_ary = (struct rpcrdma_write_array *)
+		&rdma_resp->rm_body.rm_chunks[2];
+
+	max_write = xprt->sc_max_sge * PAGE_SIZE;
+
+	/* xdr offset starts at RPC message */
+	for (xdr_off = 0, chunk_no = 0;
+	     xfer_len && chunk_no < arg_ary->wc_nchunks;
+	     chunk_no++) {
+		u64 rs_offset;
+		ch = &arg_ary->wc_array[chunk_no].wc_target;
+		write_len = min(xfer_len, ch->rs_length);
+
+
+		/* Prepare the reply chunk given the length actually
+		 * written */
+		rs_offset = get_unaligned(&(ch->rs_offset));
+		svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no,
+					    ch->rs_handle, rs_offset,
+					    write_len);
+		chunk_off = 0;
+		while (write_len) {
+			int this_write;
+
+			this_write = min(write_len, max_write);
+			ret = send_write(xprt, rqstp,
+					 ch->rs_handle,
+					 rs_offset + chunk_off,
+					 xdr_off,
+					 this_write,
+					 sge,
+					 sge_count);
+			if (ret) {
+				dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
+					ret);
+				return -EIO;
+			}
+			chunk_off += this_write;
+			xdr_off += this_write;
+			xfer_len -= this_write;
+			write_len -= this_write;
+		}
+	}
+	/* Update the req with the number of chunks actually used */
+	svc_rdma_xdr_encode_reply_array(res_ary, chunk_no);
+
+	return rqstp->rq_res.len;
+}
+
+/* This function prepares the portion of the RPCRDMA message to be
+ * sent in the RDMA_SEND. This function is called after data sent via
+ * RDMA has already been transmitted. There are three cases:
+ * - The RPCRDMA header, RPC header, and payload are all sent in a
+ *   single RDMA_SEND. This is the "inline" case.
+ * - The RPCRDMA header and some portion of the RPC header and data
+ *   are sent via this RDMA_SEND and another portion of the data is
+ *   sent via RDMA.
+ * - The RPCRDMA header [NOMSG] is sent in this RDMA_SEND and the RPC
+ *   header and data are all transmitted via RDMA.
+ * In all three cases, this function prepares the RPCRDMA header in
+ * sge[0], the 'type' parameter indicates the type to place in the
+ * RPCRDMA header, and the 'byte_count' field indicates how much of
+ * the XDR to include in this RDMA_SEND.
+ */
+static int send_reply(struct svcxprt_rdma *rdma,
+		      struct svc_rqst *rqstp,
+		      struct page *page,
+		      struct rpcrdma_msg *rdma_resp,
+		      struct svc_rdma_op_ctxt *ctxt,
+		      int sge_count,
+		      int byte_count)
+{
+	struct ib_send_wr send_wr;
+	int sge_no;
+	int sge_bytes;
+	int page_no;
+	int ret;
+
+	/* Prepare the context */
+	ctxt->pages[0] = page;
+	ctxt->count = 1;
+
+	/* Prepare the SGE for the RPCRDMA Header */
+	ctxt->sge[0].addr =
+		ib_dma_map_page(rdma->sc_cm_id->device,
+				page, 0, PAGE_SIZE, DMA_TO_DEVICE);
+	ctxt->direction = DMA_TO_DEVICE;
+	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
+	ctxt->sge[0].lkey = rdma->sc_phys_mr->lkey;
+
+	/* Determine how many of our SGE are to be transmitted */
+	for (sge_no = 1; byte_count && sge_no < sge_count; sge_no++) {
+		sge_bytes = min((size_t)ctxt->sge[sge_no].length,
+				(size_t)byte_count);
+		byte_count -= sge_bytes;
+	}
+	BUG_ON(byte_count != 0);
+
+	/* Save all respages in the ctxt and remove them from the
+	 * respages array. They are our pages until the I/O
+	 * completes.
+	 */
+	for (page_no = 0; page_no < rqstp->rq_resused; page_no++) {
+		ctxt->pages[page_no+1] = rqstp->rq_respages[page_no];
+		ctxt->count++;
+		rqstp->rq_respages[page_no] = NULL;
+	}
+
+	BUG_ON(sge_no > rdma->sc_max_sge);
+	memset(&send_wr, 0, sizeof send_wr);
+	ctxt->wr_op = IB_WR_SEND;
+	send_wr.wr_id = (unsigned long)ctxt;
+	send_wr.sg_list = ctxt->sge;
+	send_wr.num_sge = sge_no;
+	send_wr.opcode = IB_WR_SEND;
+	send_wr.send_flags =  IB_SEND_SIGNALED;
+
+	ret = svc_rdma_send(rdma, &send_wr);
+	if (ret)
+		svc_rdma_put_context(ctxt, 1);
+
+	return ret;
+}
+
+void svc_rdma_prep_reply_hdr(struct svc_rqst *rqstp)
+{
+}
+
+/*
+ * Return the start of an xdr buffer.
+ */
+static void *xdr_start(struct xdr_buf *xdr)
+{
+	return xdr->head[0].iov_base -
+		(xdr->len -
+		 xdr->page_len -
+		 xdr->tail[0].iov_len -
+		 xdr->head[0].iov_len);
+}
+
+int svc_rdma_sendto(struct svc_rqst *rqstp)
+{
+	struct svc_xprt *xprt = rqstp->rq_xprt;
+	struct svcxprt_rdma *rdma =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+	struct rpcrdma_msg *rdma_argp;
+	struct rpcrdma_msg *rdma_resp;
+	struct rpcrdma_write_array *reply_ary;
+	enum rpcrdma_proc reply_type;
+	int ret;
+	int inline_bytes;
+	struct ib_sge *sge;
+	int sge_count = 0;
+	struct page *res_page;
+	struct svc_rdma_op_ctxt *ctxt;
+
+	dprintk("svcrdma: sending response for rqstp=%p\n", rqstp);
+
+	/* Get the RDMA request header. */
+	rdma_argp = xdr_start(&rqstp->rq_arg);
+
+	/* Build an SGE for the XDR */
+	ctxt = svc_rdma_get_context(rdma);
+	ctxt->direction = DMA_TO_DEVICE;
+	sge = xdr_to_sge(rdma, &rqstp->rq_res, ctxt->sge, &sge_count);
+
+	inline_bytes = rqstp->rq_res.len;
+
+	/* Create the RDMA response header */
+	res_page = svc_rdma_get_page();
+	rdma_resp = page_address(res_page);
+	reply_ary = svc_rdma_get_reply_array(rdma_argp);
+	if (reply_ary)
+		reply_type = RDMA_NOMSG;
+	else
+		reply_type = RDMA_MSG;
+	svc_rdma_xdr_encode_reply_header(rdma, rdma_argp,
+					 rdma_resp, reply_type);
+
+	/* Send any write-chunk data and build resp write-list */
+	ret = send_write_chunks(rdma, rdma_argp, rdma_resp,
+				rqstp, sge, sge_count);
+	if (ret < 0) {
+		printk(KERN_ERR "svcrdma: failed to send write chunks, rc=%d\n",
+		       ret);
+		goto error;
+	}
+	inline_bytes -= ret;
+
+	/* Send any reply-list data and update resp reply-list */
+	ret = send_reply_chunks(rdma, rdma_argp, rdma_resp,
+				rqstp, sge, sge_count);
+	if (ret < 0) {
+		printk(KERN_ERR "svcrdma: failed to send reply chunks, rc=%d\n",
+		       ret);
+		goto error;
+	}
+	inline_bytes -= ret;
+
+	ret = send_reply(rdma, rqstp, res_page, rdma_resp, ctxt, sge_count,
+			 inline_bytes);
+	dprintk("svcrdma: send_reply returns %d\n", ret);
+	return ret;
+ error:
+	svc_rdma_put_context(ctxt, 0);
+	put_page(res_page);
+	return ret;
+}
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
new file mode 100644
index 000000000000..f09444c451bc
--- /dev/null
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -0,0 +1,1080 @@
+/*
+ * 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/sunrpc/svc_xprt.h>
+#include <linux/sunrpc/debug.h>
+#include <linux/sunrpc/rpc_rdma.h>
+#include <linux/spinlock.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <linux/sunrpc/svc_rdma.h>
+
+#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
+
+static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
+					struct sockaddr *sa, int salen,
+					int flags);
+static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt);
+static void svc_rdma_release_rqst(struct svc_rqst *);
+static void rdma_destroy_xprt(struct svcxprt_rdma *xprt);
+static void dto_tasklet_func(unsigned long data);
+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 rq_cq_reap(struct svcxprt_rdma *xprt);
+static void sq_cq_reap(struct svcxprt_rdma *xprt);
+
+DECLARE_TASKLET(dto_tasklet, dto_tasklet_func, 0UL);
+static DEFINE_SPINLOCK(dto_lock);
+static LIST_HEAD(dto_xprt_q);
+
+static struct svc_xprt_ops svc_rdma_ops = {
+	.xpo_create = svc_rdma_create,
+	.xpo_recvfrom = svc_rdma_recvfrom,
+	.xpo_sendto = svc_rdma_sendto,
+	.xpo_release_rqst = svc_rdma_release_rqst,
+	.xpo_detach = svc_rdma_detach,
+	.xpo_free = svc_rdma_free,
+	.xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
+	.xpo_has_wspace = svc_rdma_has_wspace,
+	.xpo_accept = svc_rdma_accept,
+};
+
+struct svc_xprt_class svc_rdma_class = {
+	.xcl_name = "rdma",
+	.xcl_owner = THIS_MODULE,
+	.xcl_ops = &svc_rdma_ops,
+	.xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
+};
+
+static int rdma_bump_context_cache(struct svcxprt_rdma *xprt)
+{
+	int target;
+	int at_least_one = 0;
+	struct svc_rdma_op_ctxt *ctxt;
+
+	target = min(xprt->sc_ctxt_cnt + xprt->sc_ctxt_bump,
+		     xprt->sc_ctxt_max);
+
+	spin_lock_bh(&xprt->sc_ctxt_lock);
+	while (xprt->sc_ctxt_cnt < target) {
+		xprt->sc_ctxt_cnt++;
+		spin_unlock_bh(&xprt->sc_ctxt_lock);
+
+		ctxt = kmalloc(sizeof(*ctxt), GFP_KERNEL);
+
+		spin_lock_bh(&xprt->sc_ctxt_lock);
+		if (ctxt) {
+			at_least_one = 1;
+			ctxt->next = xprt->sc_ctxt_head;
+			xprt->sc_ctxt_head = ctxt;
+		} else {
+			/* kmalloc failed...give up for now */
+			xprt->sc_ctxt_cnt--;
+			break;
+		}
+	}
+	spin_unlock_bh(&xprt->sc_ctxt_lock);
+	dprintk("svcrdma: sc_ctxt_max=%d, sc_ctxt_cnt=%d\n",
+		xprt->sc_ctxt_max, xprt->sc_ctxt_cnt);
+	return at_least_one;
+}
+
+struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
+{
+	struct svc_rdma_op_ctxt *ctxt;
+
+	while (1) {
+		spin_lock_bh(&xprt->sc_ctxt_lock);
+		if (unlikely(xprt->sc_ctxt_head == NULL)) {
+			/* Try to bump my cache. */
+			spin_unlock_bh(&xprt->sc_ctxt_lock);
+
+			if (rdma_bump_context_cache(xprt))
+				continue;
+
+			printk(KERN_INFO "svcrdma: sleeping waiting for "
+			       "context memory on xprt=%p\n",
+			       xprt);
+			schedule_timeout_uninterruptible(msecs_to_jiffies(500));
+			continue;
+		}
+		ctxt = xprt->sc_ctxt_head;
+		xprt->sc_ctxt_head = ctxt->next;
+		spin_unlock_bh(&xprt->sc_ctxt_lock);
+		ctxt->xprt = xprt;
+		INIT_LIST_HEAD(&ctxt->dto_q);
+		ctxt->count = 0;
+		break;
+	}
+	return ctxt;
+}
+
+void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages)
+{
+	struct svcxprt_rdma *xprt;
+	int i;
+
+	BUG_ON(!ctxt);
+	xprt = ctxt->xprt;
+	if (free_pages)
+		for (i = 0; i < ctxt->count; i++)
+			put_page(ctxt->pages[i]);
+
+	for (i = 0; i < ctxt->count; i++)
+		dma_unmap_single(xprt->sc_cm_id->device->dma_device,
+				 ctxt->sge[i].addr,
+				 ctxt->sge[i].length,
+				 ctxt->direction);
+	spin_lock_bh(&xprt->sc_ctxt_lock);
+	ctxt->next = xprt->sc_ctxt_head;
+	xprt->sc_ctxt_head = ctxt;
+	spin_unlock_bh(&xprt->sc_ctxt_lock);
+}
+
+/* ib_cq event handler */
+static void cq_event_handler(struct ib_event *event, void *context)
+{
+	struct svc_xprt *xprt = context;
+	dprintk("svcrdma: received CQ event id=%d, context=%p\n",
+		event->event, context);
+	set_bit(XPT_CLOSE, &xprt->xpt_flags);
+}
+
+/* QP event handler */
+static void qp_event_handler(struct ib_event *event, void *context)
+{
+	struct svc_xprt *xprt = context;
+
+	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:
+		dprintk("svcrdma: QP event %d received for QP=%p\n",
+			event->event, event->element.qp);
+		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:
+		dprintk("svcrdma: QP ERROR event %d received for QP=%p, "
+			"closing transport\n",
+			event->event, event->element.qp);
+		set_bit(XPT_CLOSE, &xprt->xpt_flags);
+		break;
+	}
+}
+
+/*
+ * Data Transfer Operation Tasklet
+ *
+ * Walks a list of transports with I/O pending, removing entries as
+ * they are added to the server's I/O pending list. Two bits indicate
+ * if SQ, RQ, or both have I/O pending. The dto_lock is an irqsave
+ * spinlock that serializes access to the transport list with the RQ
+ * and SQ interrupt handlers.
+ */
+static void dto_tasklet_func(unsigned long data)
+{
+	struct svcxprt_rdma *xprt;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dto_lock, flags);
+	while (!list_empty(&dto_xprt_q)) {
+		xprt = list_entry(dto_xprt_q.next,
+				  struct svcxprt_rdma, sc_dto_q);
+		list_del_init(&xprt->sc_dto_q);
+		spin_unlock_irqrestore(&dto_lock, flags);
+
+		if (test_and_clear_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags)) {
+			ib_req_notify_cq(xprt->sc_rq_cq, IB_CQ_NEXT_COMP);
+			rq_cq_reap(xprt);
+			set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
+			/*
+			 * If data arrived before established event,
+			 * don't enqueue. This defers RPC I/O until the
+			 * RDMA connection is complete.
+			 */
+			if (!test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags))
+				svc_xprt_enqueue(&xprt->sc_xprt);
+		}
+
+		if (test_and_clear_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags)) {
+			ib_req_notify_cq(xprt->sc_sq_cq, IB_CQ_NEXT_COMP);
+			sq_cq_reap(xprt);
+		}
+
+		spin_lock_irqsave(&dto_lock, flags);
+	}
+	spin_unlock_irqrestore(&dto_lock, flags);
+}
+
+/*
+ * Receive Queue Completion Handler
+ *
+ * Since an RQ completion handler is called on interrupt context, we
+ * need to defer the handling of the I/O to a tasklet
+ */
+static void rq_comp_handler(struct ib_cq *cq, void *cq_context)
+{
+	struct svcxprt_rdma *xprt = cq_context;
+	unsigned long flags;
+
+	/*
+	 * Set the bit regardless of whether or not it's on the list
+	 * because it may be on the list already due to an SQ
+	 * completion.
+	*/
+	set_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags);
+
+	/*
+	 * If this transport is not already on the DTO transport queue,
+	 * add it
+	 */
+	spin_lock_irqsave(&dto_lock, flags);
+	if (list_empty(&xprt->sc_dto_q))
+		list_add_tail(&xprt->sc_dto_q, &dto_xprt_q);
+	spin_unlock_irqrestore(&dto_lock, flags);
+
+	/* Tasklet does all the work to avoid irqsave locks. */
+	tasklet_schedule(&dto_tasklet);
+}
+
+/*
+ * rq_cq_reap - Process the RQ CQ.
+ *
+ * Take all completing WC off the CQE and enqueue the associated DTO
+ * context on the dto_q for the transport.
+ */
+static void rq_cq_reap(struct svcxprt_rdma *xprt)
+{
+	int ret;
+	struct ib_wc wc;
+	struct svc_rdma_op_ctxt *ctxt = NULL;
+
+	atomic_inc(&rdma_stat_rq_poll);
+
+	spin_lock_bh(&xprt->sc_rq_dto_lock);
+	while ((ret = ib_poll_cq(xprt->sc_rq_cq, 1, &wc)) > 0) {
+		ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id;
+		ctxt->wc_status = wc.status;
+		ctxt->byte_len = wc.byte_len;
+		if (wc.status != IB_WC_SUCCESS) {
+			/* Close the transport */
+			set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+			svc_rdma_put_context(ctxt, 1);
+			continue;
+		}
+		list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q);
+	}
+	spin_unlock_bh(&xprt->sc_rq_dto_lock);
+
+	if (ctxt)
+		atomic_inc(&rdma_stat_rq_prod);
+}
+
+/*
+ * Send Queue Completion Handler - potentially called on interrupt context.
+ */
+static void sq_cq_reap(struct svcxprt_rdma *xprt)
+{
+	struct svc_rdma_op_ctxt *ctxt = NULL;
+	struct ib_wc wc;
+	struct ib_cq *cq = xprt->sc_sq_cq;
+	int ret;
+
+	atomic_inc(&rdma_stat_sq_poll);
+	while ((ret = ib_poll_cq(cq, 1, &wc)) > 0) {
+		ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id;
+		xprt = ctxt->xprt;
+
+		if (wc.status != IB_WC_SUCCESS)
+			/* Close the transport */
+			set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+
+		/* Decrement used SQ WR count */
+		atomic_dec(&xprt->sc_sq_count);
+		wake_up(&xprt->sc_send_wait);
+
+		switch (ctxt->wr_op) {
+		case IB_WR_SEND:
+		case IB_WR_RDMA_WRITE:
+			svc_rdma_put_context(ctxt, 1);
+			break;
+
+		case IB_WR_RDMA_READ:
+			if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) {
+				set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
+				set_bit(RDMACTXT_F_READ_DONE, &ctxt->flags);
+				spin_lock_bh(&xprt->sc_read_complete_lock);
+				list_add_tail(&ctxt->dto_q,
+					      &xprt->sc_read_complete_q);
+				spin_unlock_bh(&xprt->sc_read_complete_lock);
+				svc_xprt_enqueue(&xprt->sc_xprt);
+			}
+			break;
+
+		default:
+			printk(KERN_ERR "svcrdma: unexpected completion type, "
+			       "opcode=%d, status=%d\n",
+			       wc.opcode, wc.status);
+			break;
+		}
+	}
+
+	if (ctxt)
+		atomic_inc(&rdma_stat_sq_prod);
+}
+
+static void sq_comp_handler(struct ib_cq *cq, void *cq_context)
+{
+	struct svcxprt_rdma *xprt = cq_context;
+	unsigned long flags;
+
+	/*
+	 * Set the bit regardless of whether or not it's on the list
+	 * because it may be on the list already due to an RQ
+	 * completion.
+	*/
+	set_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags);
+
+	/*
+	 * If this transport is not already on the DTO transport queue,
+	 * add it
+	 */
+	spin_lock_irqsave(&dto_lock, flags);
+	if (list_empty(&xprt->sc_dto_q))
+		list_add_tail(&xprt->sc_dto_q, &dto_xprt_q);
+	spin_unlock_irqrestore(&dto_lock, flags);
+
+	/* Tasklet does all the work to avoid irqsave locks. */
+	tasklet_schedule(&dto_tasklet);
+}
+
+static void create_context_cache(struct svcxprt_rdma *xprt,
+				 int ctxt_count, int ctxt_bump, int ctxt_max)
+{
+	struct svc_rdma_op_ctxt *ctxt;
+	int i;
+
+	xprt->sc_ctxt_max = ctxt_max;
+	xprt->sc_ctxt_bump = ctxt_bump;
+	xprt->sc_ctxt_cnt = 0;
+	xprt->sc_ctxt_head = NULL;
+	for (i = 0; i < ctxt_count; i++) {
+		ctxt = kmalloc(sizeof(*ctxt), GFP_KERNEL);
+		if (ctxt) {
+			ctxt->next = xprt->sc_ctxt_head;
+			xprt->sc_ctxt_head = ctxt;
+			xprt->sc_ctxt_cnt++;
+		}
+	}
+}
+
+static void destroy_context_cache(struct svc_rdma_op_ctxt *ctxt)
+{
+	struct svc_rdma_op_ctxt *next;
+	if (!ctxt)
+		return;
+
+	do {
+		next = ctxt->next;
+		kfree(ctxt);
+		ctxt = next;
+	} while (next);
+}
+
+static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
+					     int listener)
+{
+	struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL);
+
+	if (!cma_xprt)
+		return NULL;
+	svc_xprt_init(&svc_rdma_class, &cma_xprt->sc_xprt, serv);
+	INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
+	INIT_LIST_HEAD(&cma_xprt->sc_dto_q);
+	INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);
+	INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q);
+	init_waitqueue_head(&cma_xprt->sc_send_wait);
+
+	spin_lock_init(&cma_xprt->sc_lock);
+	spin_lock_init(&cma_xprt->sc_read_complete_lock);
+	spin_lock_init(&cma_xprt->sc_ctxt_lock);
+	spin_lock_init(&cma_xprt->sc_rq_dto_lock);
+
+	cma_xprt->sc_ord = svcrdma_ord;
+
+	cma_xprt->sc_max_req_size = svcrdma_max_req_size;
+	cma_xprt->sc_max_requests = svcrdma_max_requests;
+	cma_xprt->sc_sq_depth = svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT;
+	atomic_set(&cma_xprt->sc_sq_count, 0);
+
+	if (!listener) {
+		int reqs = cma_xprt->sc_max_requests;
+		create_context_cache(cma_xprt,
+				     reqs << 1, /* starting size */
+				     reqs,	/* bump amount */
+				     reqs +
+				     cma_xprt->sc_sq_depth +
+				     RPCRDMA_MAX_THREADS + 1); /* max */
+		if (!cma_xprt->sc_ctxt_head) {
+			kfree(cma_xprt);
+			return NULL;
+		}
+		clear_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags);
+	} else
+		set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags);
+
+	return cma_xprt;
+}
+
+struct page *svc_rdma_get_page(void)
+{
+	struct page *page;
+
+	while ((page = alloc_page(GFP_KERNEL)) == NULL) {
+		/* If we can't get memory, wait a bit and try again */
+		printk(KERN_INFO "svcrdma: out of memory...retrying in 1000 "
+		       "jiffies.\n");
+		schedule_timeout_uninterruptible(msecs_to_jiffies(1000));
+	}
+	return page;
+}
+
+int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
+{
+	struct ib_recv_wr recv_wr, *bad_recv_wr;
+	struct svc_rdma_op_ctxt *ctxt;
+	struct page *page;
+	unsigned long pa;
+	int sge_no;
+	int buflen;
+	int ret;
+
+	ctxt = svc_rdma_get_context(xprt);
+	buflen = 0;
+	ctxt->direction = DMA_FROM_DEVICE;
+	for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) {
+		BUG_ON(sge_no >= xprt->sc_max_sge);
+		page = svc_rdma_get_page();
+		ctxt->pages[sge_no] = page;
+		pa = ib_dma_map_page(xprt->sc_cm_id->device,
+				     page, 0, PAGE_SIZE,
+				     DMA_FROM_DEVICE);
+		ctxt->sge[sge_no].addr = pa;
+		ctxt->sge[sge_no].length = PAGE_SIZE;
+		ctxt->sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
+		buflen += PAGE_SIZE;
+	}
+	ctxt->count = sge_no;
+	recv_wr.next = NULL;
+	recv_wr.sg_list = &ctxt->sge[0];
+	recv_wr.num_sge = ctxt->count;
+	recv_wr.wr_id = (u64)(unsigned long)ctxt;
+
+	ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr);
+	return ret;
+}
+
+/*
+ * 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 svcxprt_rdma *listen_xprt = new_cma_id->context;
+	struct svcxprt_rdma *newxprt;
+
+	/* Create a new transport */
+	newxprt = rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 0);
+	if (!newxprt) {
+		dprintk("svcrdma: failed to create new transport\n");
+		return;
+	}
+	newxprt->sc_cm_id = new_cma_id;
+	new_cma_id->context = newxprt;
+	dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n",
+		newxprt, newxprt->sc_cm_id, listen_xprt);
+
+	/*
+	 * Enqueue the new transport on the accept queue of the listening
+	 * transport
+	 */
+	spin_lock_bh(&listen_xprt->sc_lock);
+	list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q);
+	spin_unlock_bh(&listen_xprt->sc_lock);
+
+	/*
+	 * Can't use svc_xprt_received here because we are not on a
+	 * rqstp thread
+	*/
+	set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags);
+	svc_xprt_enqueue(&listen_xprt->sc_xprt);
+}
+
+/*
+ * Handles events generated on the listening endpoint. These events will be
+ * either be incoming connect requests or adapter removal  events.
+ */
+static int rdma_listen_handler(struct rdma_cm_id *cma_id,
+			       struct rdma_cm_event *event)
+{
+	struct svcxprt_rdma *xprt = cma_id->context;
+	int ret = 0;
+
+	switch (event->event) {
+	case RDMA_CM_EVENT_CONNECT_REQUEST:
+		dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, "
+			"event=%d\n", cma_id, cma_id->context, event->event);
+		handle_connect_req(cma_id);
+		break;
+
+	case RDMA_CM_EVENT_ESTABLISHED:
+		/* Accept complete */
+		dprintk("svcrdma: Connection completed on LISTEN xprt=%p, "
+			"cm_id=%p\n", xprt, cma_id);
+		break;
+
+	case RDMA_CM_EVENT_DEVICE_REMOVAL:
+		dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n",
+			xprt, cma_id);
+		if (xprt)
+			set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+		break;
+
+	default:
+		dprintk("svcrdma: Unexpected event on listening endpoint %p, "
+			"event=%d\n", cma_id, event->event);
+		break;
+	}
+
+	return ret;
+}
+
+static int rdma_cma_handler(struct rdma_cm_id *cma_id,
+			    struct rdma_cm_event *event)
+{
+	struct svc_xprt *xprt = cma_id->context;
+	struct svcxprt_rdma *rdma =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+	switch (event->event) {
+	case RDMA_CM_EVENT_ESTABLISHED:
+		/* Accept complete */
+		dprintk("svcrdma: Connection completed on DTO xprt=%p, "
+			"cm_id=%p\n", xprt, cma_id);
+		clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags);
+		svc_xprt_enqueue(xprt);
+		break;
+	case RDMA_CM_EVENT_DISCONNECTED:
+		dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n",
+			xprt, cma_id);
+		if (xprt) {
+			set_bit(XPT_CLOSE, &xprt->xpt_flags);
+			svc_xprt_enqueue(xprt);
+		}
+		break;
+	case RDMA_CM_EVENT_DEVICE_REMOVAL:
+		dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, "
+			"event=%d\n", cma_id, xprt, event->event);
+		if (xprt) {
+			set_bit(XPT_CLOSE, &xprt->xpt_flags);
+			svc_xprt_enqueue(xprt);
+		}
+		break;
+	default:
+		dprintk("svcrdma: Unexpected event on DTO endpoint %p, "
+			"event=%d\n", cma_id, event->event);
+		break;
+	}
+	return 0;
+}
+
+/*
+ * Create a listening RDMA service endpoint.
+ */
+static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
+					struct sockaddr *sa, int salen,
+					int flags)
+{
+	struct rdma_cm_id *listen_id;
+	struct svcxprt_rdma *cma_xprt;
+	struct svc_xprt *xprt;
+	int ret;
+
+	dprintk("svcrdma: Creating RDMA socket\n");
+
+	cma_xprt = rdma_create_xprt(serv, 1);
+	if (!cma_xprt)
+		return ERR_PTR(ENOMEM);
+	xprt = &cma_xprt->sc_xprt;
+
+	listen_id = rdma_create_id(rdma_listen_handler, cma_xprt, RDMA_PS_TCP);
+	if (IS_ERR(listen_id)) {
+		rdma_destroy_xprt(cma_xprt);
+		dprintk("svcrdma: rdma_create_id failed = %ld\n",
+			PTR_ERR(listen_id));
+		return (void *)listen_id;
+	}
+	ret = rdma_bind_addr(listen_id, sa);
+	if (ret) {
+		rdma_destroy_xprt(cma_xprt);
+		rdma_destroy_id(listen_id);
+		dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret);
+		return ERR_PTR(ret);
+	}
+	cma_xprt->sc_cm_id = listen_id;
+
+	ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG);
+	if (ret) {
+		rdma_destroy_id(listen_id);
+		rdma_destroy_xprt(cma_xprt);
+		dprintk("svcrdma: rdma_listen failed = %d\n", ret);
+	}
+
+	/*
+	 * 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;
+}
+
+/*
+ * 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 ib_qp_init_attr qp_attr;
+	struct ib_device_attr devattr;
+	struct sockaddr *sa;
+	int ret;
+	int i;
+
+	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_bh(&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_bh(&listen_rdma->sc_lock);
+	if (!newxprt)
+		return NULL;
+
+	dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n",
+		newxprt, newxprt->sc_cm_id);
+
+	ret = ib_query_device(newxprt->sc_cm_id->device, &devattr);
+	if (ret) {
+		dprintk("svcrdma: could not query device attributes on "
+			"device %p, rc=%d\n", newxprt->sc_cm_id->device, ret);
+		goto errout;
+	}
+
+	/* Qualify the transport resource defaults with the
+	 * capabilities of this particular device */
+	newxprt->sc_max_sge = min((size_t)devattr.max_sge,
+				  (size_t)RPCSVC_MAXPAGES);
+	newxprt->sc_max_requests = min((size_t)devattr.max_qp_wr,
+				   (size_t)svcrdma_max_requests);
+	newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_max_requests;
+
+	newxprt->sc_ord =  min((size_t)devattr.max_qp_rd_atom,
+			       (size_t)svcrdma_ord);
+
+	newxprt->sc_pd = ib_alloc_pd(newxprt->sc_cm_id->device);
+	if (IS_ERR(newxprt->sc_pd)) {
+		dprintk("svcrdma: error creating PD for connect request\n");
+		goto errout;
+	}
+	newxprt->sc_sq_cq = ib_create_cq(newxprt->sc_cm_id->device,
+					 sq_comp_handler,
+					 cq_event_handler,
+					 newxprt,
+					 newxprt->sc_sq_depth,
+					 0);
+	if (IS_ERR(newxprt->sc_sq_cq)) {
+		dprintk("svcrdma: error creating SQ CQ for connect request\n");
+		goto errout;
+	}
+	newxprt->sc_rq_cq = ib_create_cq(newxprt->sc_cm_id->device,
+					 rq_comp_handler,
+					 cq_event_handler,
+					 newxprt,
+					 newxprt->sc_max_requests,
+					 0);
+	if (IS_ERR(newxprt->sc_rq_cq)) {
+		dprintk("svcrdma: error creating RQ CQ for connect request\n");
+		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.cap.max_send_wr = newxprt->sc_sq_depth;
+	qp_attr.cap.max_recv_wr = newxprt->sc_max_requests;
+	qp_attr.cap.max_send_sge = newxprt->sc_max_sge;
+	qp_attr.cap.max_recv_sge = newxprt->sc_max_sge;
+	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"
+		"    cm_id->device=%p, sc_pd->device=%p\n"
+		"    cap.max_send_wr = %d\n"
+		"    cap.max_recv_wr = %d\n"
+		"    cap.max_send_sge = %d\n"
+		"    cap.max_recv_sge = %d\n",
+		newxprt->sc_cm_id, newxprt->sc_pd,
+		newxprt->sc_cm_id->device, newxprt->sc_pd->device,
+		qp_attr.cap.max_send_wr,
+		qp_attr.cap.max_recv_wr,
+		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) {
+		/*
+		 * XXX: This is a hack. We need a xx_request_qp interface
+		 * that will adjust the qp_attr's with a best-effort
+		 * number
+		 */
+		qp_attr.cap.max_send_sge -= 2;
+		qp_attr.cap.max_recv_sge -= 2;
+		ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd,
+				     &qp_attr);
+		if (ret) {
+			dprintk("svcrdma: failed to create QP, ret=%d\n", ret);
+			goto errout;
+		}
+		newxprt->sc_max_sge = qp_attr.cap.max_send_sge;
+		newxprt->sc_max_sge = qp_attr.cap.max_recv_sge;
+		newxprt->sc_sq_depth = qp_attr.cap.max_send_wr;
+		newxprt->sc_max_requests = qp_attr.cap.max_recv_wr;
+	}
+	newxprt->sc_qp = newxprt->sc_cm_id->qp;
+
+	/* Register all of physical memory */
+	newxprt->sc_phys_mr = ib_get_dma_mr(newxprt->sc_pd,
+					    IB_ACCESS_LOCAL_WRITE |
+					    IB_ACCESS_REMOTE_WRITE);
+	if (IS_ERR(newxprt->sc_phys_mr)) {
+		dprintk("svcrdma: Failed to create DMA MR ret=%d\n", ret);
+		goto errout;
+	}
+
+	/* Post receive buffers */
+	for (i = 0; i < newxprt->sc_max_requests; i++) {
+		ret = svc_rdma_post_recv(newxprt);
+		if (ret) {
+			dprintk("svcrdma: failure posting receive buffers\n");
+			goto errout;
+		}
+	}
+
+	/* Swap out the handler */
+	newxprt->sc_cm_id->event_handler = rdma_cma_handler;
+
+	/* 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 = newxprt->sc_ord;
+	ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
+	if (ret) {
+		dprintk("svcrdma: failed to accept new connection, ret=%d\n",
+		       ret);
+		goto errout;
+	}
+
+	dprintk("svcrdma: new connection %p accepted with the following "
+		"attributes:\n"
+		"    local_ip        : %d.%d.%d.%d\n"
+		"    local_port	     : %d\n"
+		"    remote_ip       : %d.%d.%d.%d\n"
+		"    remote_port     : %d\n"
+		"    max_sge         : %d\n"
+		"    sq_depth        : %d\n"
+		"    max_requests    : %d\n"
+		"    ord             : %d\n",
+		newxprt,
+		NIPQUAD(((struct sockaddr_in *)&newxprt->sc_cm_id->
+			 route.addr.src_addr)->sin_addr.s_addr),
+		ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
+		       route.addr.src_addr)->sin_port),
+		NIPQUAD(((struct sockaddr_in *)&newxprt->sc_cm_id->
+			 route.addr.dst_addr)->sin_addr.s_addr),
+		ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
+		       route.addr.dst_addr)->sin_port),
+		newxprt->sc_max_sge,
+		newxprt->sc_sq_depth,
+		newxprt->sc_max_requests,
+		newxprt->sc_ord);
+
+	/* Set the local and remote addresses in the transport */
+	sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
+	svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa));
+	sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr;
+	svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa));
+
+	ib_req_notify_cq(newxprt->sc_sq_cq, IB_CQ_NEXT_COMP);
+	ib_req_notify_cq(newxprt->sc_rq_cq, IB_CQ_NEXT_COMP);
+	return &newxprt->sc_xprt;
+
+ errout:
+	dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret);
+	rdma_destroy_id(newxprt->sc_cm_id);
+	rdma_destroy_xprt(newxprt);
+	return NULL;
+}
+
+/*
+ * Post an RQ WQE to the RQ when the rqst is being released. This
+ * effectively returns an RQ credit to the client. The rq_xprt_ctxt
+ * will be null if the request is deferred due to an RDMA_READ or the
+ * transport had no data ready (EAGAIN). Note that an RPC deferred in
+ * svc_process will still return the credit, this is because the data
+ * is copied and no longer consume a WQE/WC.
+ */
+static void svc_rdma_release_rqst(struct svc_rqst *rqstp)
+{
+	int err;
+	struct svcxprt_rdma *rdma =
+		container_of(rqstp->rq_xprt, struct svcxprt_rdma, sc_xprt);
+	if (rqstp->rq_xprt_ctxt) {
+		BUG_ON(rqstp->rq_xprt_ctxt != rdma);
+		err = svc_rdma_post_recv(rdma);
+		if (err)
+			dprintk("svcrdma: failed to post an RQ WQE error=%d\n",
+				err);
+	}
+	rqstp->rq_xprt_ctxt = NULL;
+}
+
+/* Disable data ready events for this connection */
+static void svc_rdma_detach(struct svc_xprt *xprt)
+{
+	struct svcxprt_rdma *rdma =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+	unsigned long flags;
+
+	dprintk("svc: svc_rdma_detach(%p)\n", xprt);
+	/*
+	 * Shutdown the connection. This will ensure we don't get any
+	 * more events from the provider.
+	 */
+	rdma_disconnect(rdma->sc_cm_id);
+	rdma_destroy_id(rdma->sc_cm_id);
+
+	/* We may already be on the DTO list */
+	spin_lock_irqsave(&dto_lock, flags);
+	if (!list_empty(&rdma->sc_dto_q))
+		list_del_init(&rdma->sc_dto_q);
+	spin_unlock_irqrestore(&dto_lock, flags);
+}
+
+static void svc_rdma_free(struct svc_xprt *xprt)
+{
+	struct svcxprt_rdma *rdma = (struct svcxprt_rdma *)xprt;
+	dprintk("svcrdma: svc_rdma_free(%p)\n", rdma);
+	rdma_destroy_xprt(rdma);
+	kfree(rdma);
+}
+
+static void rdma_destroy_xprt(struct svcxprt_rdma *xprt)
+{
+	if (xprt->sc_qp && !IS_ERR(xprt->sc_qp))
+		ib_destroy_qp(xprt->sc_qp);
+
+	if (xprt->sc_sq_cq && !IS_ERR(xprt->sc_sq_cq))
+		ib_destroy_cq(xprt->sc_sq_cq);
+
+	if (xprt->sc_rq_cq && !IS_ERR(xprt->sc_rq_cq))
+		ib_destroy_cq(xprt->sc_rq_cq);
+
+	if (xprt->sc_phys_mr && !IS_ERR(xprt->sc_phys_mr))
+		ib_dereg_mr(xprt->sc_phys_mr);
+
+	if (xprt->sc_pd && !IS_ERR(xprt->sc_pd))
+		ib_dealloc_pd(xprt->sc_pd);
+
+	destroy_context_cache(xprt->sc_ctxt_head);
+}
+
+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 fewer SQ WR available than required to send a
+	 * simple response, return false.
+	 */
+	if ((rdma->sc_sq_depth - atomic_read(&rdma->sc_sq_count) < 3))
+		return 0;
+
+	/*
+	 * ...or there are already waiters on the SQ,
+	 * return false.
+	 */
+	if (waitqueue_active(&rdma->sc_send_wait))
+		return 0;
+
+	/* Otherwise return true. */
+	return 1;
+}
+
+int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr)
+{
+	struct ib_send_wr *bad_wr;
+	int ret;
+
+	if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
+		return 0;
+
+	BUG_ON(wr->send_flags != IB_SEND_SIGNALED);
+	BUG_ON(((struct svc_rdma_op_ctxt *)(unsigned long)wr->wr_id)->wr_op !=
+		wr->opcode);
+	/* If the SQ is full, wait until an SQ entry is available */
+	while (1) {
+		spin_lock_bh(&xprt->sc_lock);
+		if (xprt->sc_sq_depth == atomic_read(&xprt->sc_sq_count)) {
+			spin_unlock_bh(&xprt->sc_lock);
+			atomic_inc(&rdma_stat_sq_starve);
+			/* See if we can reap some SQ WR */
+			sq_cq_reap(xprt);
+
+			/* Wait until SQ WR available if SQ still full */
+			wait_event(xprt->sc_send_wait,
+				   atomic_read(&xprt->sc_sq_count) <
+				   xprt->sc_sq_depth);
+			continue;
+		}
+		/* Bumped used SQ WR count and post */
+		ret = ib_post_send(xprt->sc_qp, wr, &bad_wr);
+		if (!ret)
+			atomic_inc(&xprt->sc_sq_count);
+		else
+			dprintk("svcrdma: failed to post SQ WR rc=%d, "
+			       "sc_sq_count=%d, sc_sq_depth=%d\n",
+			       ret, atomic_read(&xprt->sc_sq_count),
+			       xprt->sc_sq_depth);
+		spin_unlock_bh(&xprt->sc_lock);
+		break;
+	}
+	return ret;
+}
+
+int svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
+			enum rpcrdma_errcode err)
+{
+	struct ib_send_wr err_wr;
+	struct ib_sge sge;
+	struct page *p;
+	struct svc_rdma_op_ctxt *ctxt;
+	u32 *va;
+	int length;
+	int ret;
+
+	p = svc_rdma_get_page();
+	va = page_address(p);
+
+	/* XDR encode error */
+	length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
+
+	/* Prepare SGE for local address */
+	sge.addr = ib_dma_map_page(xprt->sc_cm_id->device,
+				   p, 0, PAGE_SIZE, DMA_FROM_DEVICE);
+	sge.lkey = xprt->sc_phys_mr->lkey;
+	sge.length = length;
+
+	ctxt = svc_rdma_get_context(xprt);
+	ctxt->count = 1;
+	ctxt->pages[0] = p;
+
+	/* Prepare SEND WR */
+	memset(&err_wr, 0, sizeof err_wr);
+	ctxt->wr_op = IB_WR_SEND;
+	err_wr.wr_id = (unsigned long)ctxt;
+	err_wr.sg_list = &sge;
+	err_wr.num_sge = 1;
+	err_wr.opcode = IB_WR_SEND;
+	err_wr.send_flags = IB_SEND_SIGNALED;
+
+	/* Post It */
+	ret = svc_rdma_send(xprt, &err_wr);
+	if (ret) {
+		dprintk("svcrdma: Error posting send = %d\n", ret);
+		svc_rdma_put_context(ctxt, 1);
+	}
+
+	return ret;
+}