9p: rdma: RDMA Transport Support for 9P (fc79d4b1) · Commits · e / devices / android_kernel_oneplus_sm7250

include/net/9p/client.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -206,6 +206,7 @@ int p9_client_wstat(struct p9_fid fid, struct p9_wstat wst);
		struct p9_req_t p9_tag_lookup(struct p9_client , u16);
		void p9_client_cb(struct p9_client c, struct p9_req_t req);

		int p9_parse_header(struct p9_fcall , int32_t , int8_t , int16_t , int);
		int p9stat_read(char , int, struct p9_wstat , int);
		void p9stat_free(struct p9_wstat *);

net/9p/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -20,6 +20,12 @@ config NET_9P_VIRTIO
		This builds support for a transports between
		guest partitions and a host partition.

		config NET_9P_RDMA
		depends on NET_9P && INFINIBAND && EXPERIMENTAL
		tristate "9P RDMA Transport (Experimental)"
		help
		This builds support for a RDMA transport.

		config NET_9P_DEBUG
		bool "Debug information"
		depends on NET_9P

net/9p/Makefile

+4 −0

Original line number	Diff line number	Diff line
		obj-$(CONFIG_NET_9P) := 9pnet.o
		obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
		obj-$(CONFIG_NET_9P_RDMA) += 9pnet_rdma.o

		9pnet-objs := \
		mod.o \
		@@ -11,3 +12,6 @@ obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o

		9pnet_virtio-objs := \
		trans_virtio.o \

		9pnet_rdma-objs := \
		trans_rdma.o \

net/9p/trans_rdma.c

0 → 100644

+712 −0

Original line number	Diff line number	Diff line
		/*
		* linux/fs/9p/trans_rdma.c
		*
		* RDMA transport layer based on the trans_fd.c implementation.
		*
		* Copyright (C) 2008 by Tom Tucker <tom@opengridcomputing.com>
		* Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
		* Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
		* Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
		* Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2
		* as published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to:
		* Free Software Foundation
		* 51 Franklin Street, Fifth Floor
		* Boston, MA 02111-1301 USA
		*
		*/

		#include <linux/in.h>
		#include <linux/module.h>
		#include <linux/net.h>
		#include <linux/ipv6.h>
		#include <linux/kthread.h>
		#include <linux/errno.h>
		#include <linux/kernel.h>
		#include <linux/un.h>
		#include <linux/uaccess.h>
		#include <linux/inet.h>
		#include <linux/idr.h>
		#include <linux/file.h>
		#include <linux/parser.h>
		#include <linux/semaphore.h>
		#include <net/9p/9p.h>
		#include <net/9p/client.h>
		#include <net/9p/transport.h>
		#include <rdma/ib_verbs.h>
		#include <rdma/rdma_cm.h>
		#include <rdma/ib_verbs.h>

		#define P9_PORT 5640
		#define P9_RDMA_SQ_DEPTH 32
		#define P9_RDMA_RQ_DEPTH 32
		#define P9_RDMA_SEND_SGE 4
		#define P9_RDMA_RECV_SGE 4
		#define P9_RDMA_IRD 0
		#define P9_RDMA_ORD 0
		#define P9_RDMA_TIMEOUT 30000 /* 30 seconds */
		#define P9_RDMA_MAXSIZE (44096) / Min SGE is 4, so we can
		* safely advertise a maxsize
		* of 64k */

		#define P9_RDMA_MAX_SGE (P9_RDMA_MAXSIZE >> PAGE_SHIFT)
		/**
		* struct p9_trans_rdma - RDMA transport instance
		*
		* @state: tracks the transport state machine for connection setup and tear down
		* @cm_id: The RDMA CM ID
		* @pd: Protection Domain pointer
		* @qp: Queue Pair pointer
		* @cq: Completion Queue pointer
		* @lkey: The local access only memory region key
		* @timeout: Number of uSecs to wait for connection management events
		* @sq_depth: The depth of the Send Queue
		* @sq_sem: Semaphore for the SQ
		* @rq_depth: The depth of the Receive Queue.
		* @addr: The remote peer's address
		* @req_lock: Protects the active request list
		* @send_wait: Wait list when the SQ fills up
		* @cm_done: Completion event for connection management tracking
		*/
		struct p9_trans_rdma {
		enum {
		P9_RDMA_INIT,
		P9_RDMA_ADDR_RESOLVED,
		P9_RDMA_ROUTE_RESOLVED,
		P9_RDMA_CONNECTED,
		P9_RDMA_FLUSHING,
		P9_RDMA_CLOSING,
		P9_RDMA_CLOSED,
		} state;
		struct rdma_cm_id *cm_id;
		struct ib_pd *pd;
		struct ib_qp *qp;
		struct ib_cq *cq;
		struct ib_mr *dma_mr;
		u32 lkey;
		long timeout;
		int sq_depth;
		struct semaphore sq_sem;
		int rq_depth;
		atomic_t rq_count;
		struct sockaddr_in addr;
		spinlock_t req_lock;

		struct completion cm_done;
		};

		/**
		* p9_rdma_context - Keeps track of in-process WR
		*
		* @wc_op: The original WR op for when the CQE completes in error.
		* @busa: Bus address to unmap when the WR completes
		* @req: Keeps track of requests (send)
		* @rc: Keepts track of replies (receive)
		*/
		struct p9_rdma_req;
		struct p9_rdma_context {
		enum ib_wc_opcode wc_op;
		dma_addr_t busa;
		union {
		struct p9_req_t *req;
		struct p9_fcall *rc;
		};
		};

		/**
		* p9_rdma_opts - Collection of mount options
		* @port: port of connection
		* @sq_depth: The requested depth of the SQ. This really doesn't need
		* to be any deeper than the number of threads used in the client
		* @rq_depth: The depth of the RQ. Should be greater than or equal to SQ depth
		* @timeout: Time to wait in msecs for CM events
		*/
		struct p9_rdma_opts {
		short port;
		int sq_depth;
		int rq_depth;
		long timeout;
		};

		/*
		* Option Parsing (code inspired by NFS code)
		*/
		enum {
		/* Options that take integer arguments */
		Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout, Opt_err,
		};

		static match_table_t tokens = {
		{Opt_port, "port=%u"},
		{Opt_sq_depth, "sq=%u"},
		{Opt_rq_depth, "rq=%u"},
		{Opt_timeout, "timeout=%u"},
		{Opt_err, NULL},
		};

		/**
		* parse_options - parse mount options into session structure
		* @options: options string passed from mount
		* @opts: transport-specific structure to parse options into
		*
		* Returns 0 upon success, -ERRNO upon failure
		*/
		static int parse_opts(char params, struct p9_rdma_opts opts)
		{
		char *p;
		substring_t args[MAX_OPT_ARGS];
		int option;
		char *options;
		int ret;

		opts->port = P9_PORT;
		opts->sq_depth = P9_RDMA_SQ_DEPTH;
		opts->rq_depth = P9_RDMA_RQ_DEPTH;
		opts->timeout = P9_RDMA_TIMEOUT;

		if (!params)
		return 0;

		options = kstrdup(params, GFP_KERNEL);
		if (!options) {
		P9_DPRINTK(P9_DEBUG_ERROR,
		"failed to allocate copy of option string\n");
		return -ENOMEM;
		}

		while ((p = strsep(&options, ",")) != NULL) {
		int token;
		int r;
		if (!*p)
		continue;
		token = match_token(p, tokens, args);
		r = match_int(&args[0], &option);
		if (r < 0) {
		P9_DPRINTK(P9_DEBUG_ERROR,
		"integer field, but no integer?\n");
		ret = r;
		continue;
		}
		switch (token) {
		case Opt_port:
		opts->port = option;
		break;
		case Opt_sq_depth:
		opts->sq_depth = option;
		break;
		case Opt_rq_depth:
		opts->rq_depth = option;
		break;
		case Opt_timeout:
		opts->timeout = option;
		break;
		default:
		continue;
		}
		}
		/* RQ must be at least as large as the SQ */
		opts->rq_depth = max(opts->rq_depth, opts->sq_depth);
		kfree(options);
		return 0;
		}

		static int
		p9_cm_event_handler(struct rdma_cm_id id, struct rdma_cm_event event)
		{
		struct p9_client *c = id->context;
		struct p9_trans_rdma *rdma = c->trans;
		switch (event->event) {
		case RDMA_CM_EVENT_ADDR_RESOLVED:
		BUG_ON(rdma->state != P9_RDMA_INIT);
		rdma->state = P9_RDMA_ADDR_RESOLVED;
		break;

		case RDMA_CM_EVENT_ROUTE_RESOLVED:
		BUG_ON(rdma->state != P9_RDMA_ADDR_RESOLVED);
		rdma->state = P9_RDMA_ROUTE_RESOLVED;
		break;

		case RDMA_CM_EVENT_ESTABLISHED:
		BUG_ON(rdma->state != P9_RDMA_ROUTE_RESOLVED);
		rdma->state = P9_RDMA_CONNECTED;
		break;

		case RDMA_CM_EVENT_DISCONNECTED:
		if (rdma)
		rdma->state = P9_RDMA_CLOSED;
		if (c)
		c->status = Disconnected;
		break;

		case RDMA_CM_EVENT_TIMEWAIT_EXIT:
		break;

		case RDMA_CM_EVENT_ADDR_CHANGE:
		case RDMA_CM_EVENT_ROUTE_ERROR:
		case RDMA_CM_EVENT_DEVICE_REMOVAL:
		case RDMA_CM_EVENT_MULTICAST_JOIN:
		case RDMA_CM_EVENT_MULTICAST_ERROR:
		case RDMA_CM_EVENT_REJECTED:
		case RDMA_CM_EVENT_CONNECT_REQUEST:
		case RDMA_CM_EVENT_CONNECT_RESPONSE:
		case RDMA_CM_EVENT_CONNECT_ERROR:
		case RDMA_CM_EVENT_ADDR_ERROR:
		case RDMA_CM_EVENT_UNREACHABLE:
		c->status = Disconnected;
		rdma_disconnect(rdma->cm_id);
		break;
		default:
		BUG();
		}
		complete(&rdma->cm_done);
		return 0;
		}

		static void
		handle_recv(struct p9_client client, struct p9_trans_rdma rdma,
		struct p9_rdma_context *c, enum ib_wc_status status, u32 byte_len)
		{
		struct p9_req_t *req;
		int err = 0;
		int16_t tag;

		req = NULL;
		ib_dma_unmap_single(rdma->cm_id->device, c->busa, client->msize,
		DMA_FROM_DEVICE);

		if (status != IB_WC_SUCCESS)
		goto err_out;

		err = p9_parse_header(c->rc, NULL, NULL, &tag, 1);
		if (err)
		goto err_out;

		req = p9_tag_lookup(client, tag);
		if (!req)
		goto err_out;

		req->rc = c->rc;
		p9_client_cb(client, req);

		return;

		err_out:
		P9_DPRINTK(P9_DEBUG_ERROR, "req %p err %d status %d\n",
		req, err, status);
		rdma->state = P9_RDMA_FLUSHING;
		client->status = Disconnected;
		return;
		}

		static void
		handle_send(struct p9_client client, struct p9_trans_rdma rdma,
		struct p9_rdma_context *c, enum ib_wc_status status, u32 byte_len)
		{
		ib_dma_unmap_single(rdma->cm_id->device,
		c->busa, c->req->tc->size,
		DMA_TO_DEVICE);
		}

		static void qp_event_handler(struct ib_event event, void context)
		{
		P9_DPRINTK(P9_DEBUG_ERROR, "QP event %d context %p\n", event->event,
		context);
		}

		static void cq_comp_handler(struct ib_cq cq, void cq_context)
		{
		struct p9_client *client = cq_context;
		struct p9_trans_rdma *rdma = client->trans;
		int ret;
		struct ib_wc wc;

		ib_req_notify_cq(rdma->cq, IB_CQ_NEXT_COMP);
		while ((ret = ib_poll_cq(cq, 1, &wc)) > 0) {
		struct p9_rdma_context c = (void ) (unsigned long) wc.wr_id;

		switch (c->wc_op) {
		case IB_WC_RECV:
		atomic_dec(&rdma->rq_count);
		handle_recv(client, rdma, c, wc.status, wc.byte_len);
		break;

		case IB_WC_SEND:
		handle_send(client, rdma, c, wc.status, wc.byte_len);
		up(&rdma->sq_sem);
		break;

		default:
		printk(KERN_ERR "9prdma: unexpected completion type, "
		"c->wc_op=%d, wc.opcode=%d, status=%d\n",
		c->wc_op, wc.opcode, wc.status);
		break;
		}
		kfree(c);
		}
		}

		static void cq_event_handler(struct ib_event e, void v)
		{
		P9_DPRINTK(P9_DEBUG_ERROR, "CQ event %d context %p\n", e->event, v);
		}

		static void rdma_destroy_trans(struct p9_trans_rdma *rdma)
		{
		if (!rdma)
		return;

		if (rdma->dma_mr && !IS_ERR(rdma->dma_mr))
		ib_dereg_mr(rdma->dma_mr);

		if (rdma->qp && !IS_ERR(rdma->qp))
		ib_destroy_qp(rdma->qp);

		if (rdma->pd && !IS_ERR(rdma->pd))
		ib_dealloc_pd(rdma->pd);

		if (rdma->cq && !IS_ERR(rdma->cq))
		ib_destroy_cq(rdma->cq);

		if (rdma->cm_id && !IS_ERR(rdma->cm_id))
		rdma_destroy_id(rdma->cm_id);

		kfree(rdma);
		}

		static int
		post_recv(struct p9_client client, struct p9_rdma_context c)
		{
		struct p9_trans_rdma *rdma = client->trans;
		struct ib_recv_wr wr, *bad_wr;
		struct ib_sge sge;

		c->busa = ib_dma_map_single(rdma->cm_id->device,
		c->rc->sdata, client->msize,
		DMA_FROM_DEVICE);
		if (ib_dma_mapping_error(rdma->cm_id->device, c->busa))
		goto error;

		sge.addr = c->busa;
		sge.length = client->msize;
		sge.lkey = rdma->lkey;

		wr.next = NULL;
		c->wc_op = IB_WC_RECV;
		wr.wr_id = (unsigned long) c;
		wr.sg_list = &sge;
		wr.num_sge = 1;
		return ib_post_recv(rdma->qp, &wr, &bad_wr);

		error:
		P9_DPRINTK(P9_DEBUG_ERROR, "EIO\n");
		return -EIO;
		}

		static int rdma_request(struct p9_client client, struct p9_req_t req)
		{
		struct p9_trans_rdma *rdma = client->trans;
		struct ib_send_wr wr, *bad_wr;
		struct ib_sge sge;
		int err = 0;
		unsigned long flags;
		struct p9_rdma_context *c = NULL;
		struct p9_rdma_context *rpl_context = NULL;

		/* Allocate an fcall for the reply */
		rpl_context = kmalloc(sizeof *rpl_context, GFP_KERNEL);
		if (!rpl_context)
		goto err_close;

		/*
		* If the request has a buffer, steal it, otherwise
		* allocate a new one. Typically, requests should already
		* have receive buffers allocated and just swap them around
		*/
		if (!req->rc) {
		req->rc = kmalloc(sizeof(struct p9_fcall)+client->msize,
		GFP_KERNEL);
		if (req->rc) {
		req->rc->sdata = (char *) req->rc +
		sizeof(struct p9_fcall);
		req->rc->capacity = client->msize;
		}
		}
		rpl_context->rc = req->rc;
		if (!rpl_context->rc) {
		kfree(rpl_context);
		goto err_close;
		}

		/*
		* Post a receive buffer for this request. We need to ensure
		* there is a reply buffer available for every outstanding
		* request. A flushed request can result in no reply for an
		* outstanding request, so we must keep a count to avoid
		* overflowing the RQ.
		*/
		if (atomic_inc_return(&rdma->rq_count) <= rdma->rq_depth) {
		err = post_recv(client, rpl_context);
		if (err) {
		kfree(rpl_context->rc);
		kfree(rpl_context);
		goto err_close;
		}
		} else
		atomic_dec(&rdma->rq_count);

		/* remove posted receive buffer from request structure */
		req->rc = NULL;

		/* Post the request */
		c = kmalloc(sizeof *c, GFP_KERNEL);
		if (!c)
		goto err_close;
		c->req = req;

		c->busa = ib_dma_map_single(rdma->cm_id->device,
		c->req->tc->sdata, c->req->tc->size,
		DMA_TO_DEVICE);
		if (ib_dma_mapping_error(rdma->cm_id->device, c->busa))
		goto error;

		sge.addr = c->busa;
		sge.length = c->req->tc->size;
		sge.lkey = rdma->lkey;

		wr.next = NULL;
		c->wc_op = IB_WC_SEND;
		wr.wr_id = (unsigned long) c;
		wr.opcode = IB_WR_SEND;
		wr.send_flags = IB_SEND_SIGNALED;
		wr.sg_list = &sge;
		wr.num_sge = 1;

		if (down_interruptible(&rdma->sq_sem))
		goto error;

		return ib_post_send(rdma->qp, &wr, &bad_wr);

		error:
		P9_DPRINTK(P9_DEBUG_ERROR, "EIO\n");
		return -EIO;

		err_close:
		spin_lock_irqsave(&rdma->req_lock, flags);
		if (rdma->state < P9_RDMA_CLOSING) {
		rdma->state = P9_RDMA_CLOSING;
		spin_unlock_irqrestore(&rdma->req_lock, flags);
		rdma_disconnect(rdma->cm_id);
		} else
		spin_unlock_irqrestore(&rdma->req_lock, flags);
		return err;
		}

		static void rdma_close(struct p9_client *client)
		{
		struct p9_trans_rdma *rdma;

		if (!client)
		return;

		rdma = client->trans;
		if (!rdma)
		return;

		client->status = Disconnected;
		rdma_disconnect(rdma->cm_id);
		rdma_destroy_trans(rdma);
		}

		/**
		* alloc_rdma - Allocate and initialize the rdma transport structure
		* @msize: MTU
		* @dotu: Extension attribute
		* @opts: Mount options structure
		*/
		static struct p9_trans_rdma alloc_rdma(struct p9_rdma_opts opts)
		{
		struct p9_trans_rdma *rdma;

		rdma = kzalloc(sizeof(struct p9_trans_rdma), GFP_KERNEL);
		if (!rdma)
		return NULL;

		rdma->sq_depth = opts->sq_depth;
		rdma->rq_depth = opts->rq_depth;
		rdma->timeout = opts->timeout;
		spin_lock_init(&rdma->req_lock);
		init_completion(&rdma->cm_done);
		sema_init(&rdma->sq_sem, rdma->sq_depth);
		atomic_set(&rdma->rq_count, 0);

		return rdma;
		}

		/* its not clear to me we can do anything after send has been posted */
		static int rdma_cancel(struct p9_client client, struct p9_req_t req)
		{
		return 1;
		}

		/**
		* trans_create_rdma - Transport method for creating atransport instance
		* @client: client instance
		* @addr: IP address string
		* @args: Mount options string
		*/
		static int
		rdma_create_trans(struct p9_client client, const char addr, char *args)
		{
		int err;
		struct p9_rdma_opts opts;
		struct p9_trans_rdma *rdma;
		struct rdma_conn_param conn_param;
		struct ib_qp_init_attr qp_attr;
		struct ib_device_attr devattr;

		/* Parse the transport specific mount options */
		err = parse_opts(args, &opts);
		if (err < 0)
		return err;

		/* Create and initialize the RDMA transport structure */
		rdma = alloc_rdma(&opts);
		if (!rdma)
		return -ENOMEM;

		/* Create the RDMA CM ID */
		rdma->cm_id = rdma_create_id(p9_cm_event_handler, client, RDMA_PS_TCP);
		if (IS_ERR(rdma->cm_id))
		goto error;

		/* Resolve the server's address */
		rdma->addr.sin_family = AF_INET;
		rdma->addr.sin_addr.s_addr = in_aton(addr);
		rdma->addr.sin_port = htons(opts.port);
		err = rdma_resolve_addr(rdma->cm_id, NULL,
		(struct sockaddr *)&rdma->addr,
		rdma->timeout);
		if (err)
		goto error;
		err = wait_for_completion_interruptible(&rdma->cm_done);
		if (err \|\| (rdma->state != P9_RDMA_ADDR_RESOLVED))
		goto error;

		/* Resolve the route to the server */
		err = rdma_resolve_route(rdma->cm_id, rdma->timeout);
		if (err)
		goto error;
		err = wait_for_completion_interruptible(&rdma->cm_done);
		if (err \|\| (rdma->state != P9_RDMA_ROUTE_RESOLVED))
		goto error;

		/* Query the device attributes */
		err = ib_query_device(rdma->cm_id->device, &devattr);
		if (err)
		goto error;

		/* Create the Completion Queue */
		rdma->cq = ib_create_cq(rdma->cm_id->device, cq_comp_handler,
		cq_event_handler, client,
		opts.sq_depth + opts.rq_depth + 1, 0);
		if (IS_ERR(rdma->cq))
		goto error;
		ib_req_notify_cq(rdma->cq, IB_CQ_NEXT_COMP);

		/* Create the Protection Domain */
		rdma->pd = ib_alloc_pd(rdma->cm_id->device);
		if (IS_ERR(rdma->pd))
		goto error;

		/* Cache the DMA lkey in the transport */
		rdma->dma_mr = NULL;
		if (devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)
		rdma->lkey = rdma->cm_id->device->local_dma_lkey;
		else {
		rdma->dma_mr = ib_get_dma_mr(rdma->pd, IB_ACCESS_LOCAL_WRITE);
		if (IS_ERR(rdma->dma_mr))
		goto error;
		rdma->lkey = rdma->dma_mr->lkey;
		}

		/* Create the Queue Pair */
		memset(&qp_attr, 0, sizeof qp_attr);
		qp_attr.event_handler = qp_event_handler;
		qp_attr.qp_context = client;
		qp_attr.cap.max_send_wr = opts.sq_depth;
		qp_attr.cap.max_recv_wr = opts.rq_depth;
		qp_attr.cap.max_send_sge = P9_RDMA_SEND_SGE;
		qp_attr.cap.max_recv_sge = P9_RDMA_RECV_SGE;
		qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
		qp_attr.qp_type = IB_QPT_RC;
		qp_attr.send_cq = rdma->cq;
		qp_attr.recv_cq = rdma->cq;
		err = rdma_create_qp(rdma->cm_id, rdma->pd, &qp_attr);
		if (err)
		goto error;
		rdma->qp = rdma->cm_id->qp;

		/* Request a connection */
		memset(&conn_param, 0, sizeof(conn_param));
		conn_param.private_data = NULL;
		conn_param.private_data_len = 0;
		conn_param.responder_resources = P9_RDMA_IRD;
		conn_param.initiator_depth = P9_RDMA_ORD;
		err = rdma_connect(rdma->cm_id, &conn_param);
		if (err)
		goto error;
		err = wait_for_completion_interruptible(&rdma->cm_done);
		if (err \|\| (rdma->state != P9_RDMA_CONNECTED))
		goto error;

		client->trans = rdma;
		client->status = Connected;

		return 0;

		error:
		rdma_destroy_trans(rdma);
		return -ENOTCONN;
		}

		static struct p9_trans_module p9_rdma_trans = {
		.name = "rdma",
		.maxsize = P9_RDMA_MAXSIZE,
		.def = 0,
		.owner = THIS_MODULE,
		.create = rdma_create_trans,
		.close = rdma_close,
		.request = rdma_request,
		.cancel = rdma_cancel,
		};

		/**
		* p9_trans_rdma_init - Register the 9P RDMA transport driver
		*/
		static int __init p9_trans_rdma_init(void)
		{
		v9fs_register_trans(&p9_rdma_trans);
		return 0;
		}

		static void __exit p9_trans_rdma_exit(void)
		{
		v9fs_unregister_trans(&p9_rdma_trans);
		}

		module_init(p9_trans_rdma_init);
		module_exit(p9_trans_rdma_exit);

		MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
		MODULE_DESCRIPTION("RDMA Transport for 9P");
		MODULE_LICENSE("Dual BSD/GPL");

Original line number	Diff line number	Diff line
		@@ -206,6 +206,7 @@ int p9_client_wstat(struct p9_fid fid, struct p9_wstat wst);
		struct p9_req_t p9_tag_lookup(struct p9_client , u16);
		void p9_client_cb(struct p9_client c, struct p9_req_t req);

		int p9_parse_header(struct p9_fcall , int32_t , int8_t , int16_t , int);
		int p9stat_read(char , int, struct p9_wstat , int);
		void p9stat_free(struct p9_wstat *);