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Commit 75216638 authored by Sean Hefty's avatar Sean Hefty Committed by Roland Dreier
Browse files

RDMA/cma: Export rdma cm interface to userspace 



Export the rdma cm interfaces to userspace via a misc device.

Signed-off-by: default avatarSean Hefty <sean.hefty@intel.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 628e5f6d

drivers/infiniband/core/Makefile

+5 −1
Original line number Diff line number Diff line 
infiniband-$(CONFIG_INFINIBAND_ADDR_TRANS)	:= ib_addr.o rdma_cm.o

user_access-$(CONFIG_INFINIBAND_ADDR_TRANS)	:= rdma_ucm.o



obj-$(CONFIG_INFINIBAND) +=		ib_core.o ib_mad.o ib_sa.o \

					ib_cm.o iw_cm.o $(infiniband-y)

obj-$(CONFIG_INFINIBAND_USER_MAD) +=	ib_umad.o

obj-$(CONFIG_INFINIBAND_USER_ACCESS) +=	ib_uverbs.o ib_ucm.o

obj-$(CONFIG_INFINIBAND_USER_ACCESS) +=	ib_uverbs.o ib_ucm.o \

					$(user_access-y)



ib_core-y :=			packer.o ud_header.o verbs.o sysfs.o \

				device.o fmr_pool.o cache.o
@@ -18,6 +20,8 @@ iw_cm-y := iwcm.o 


rdma_cm-y :=			cma.o



rdma_ucm-y :=			ucma.o



ib_addr-y :=			addr.o



ib_umad-y :=			user_mad.o

drivers/infiniband/core/ucma.c

0 → 100644
+874 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2005-2006 Intel Corporation.  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

 * OpenIB.org BSD 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.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

 * SOFTWARE.

 */



#include <linux/completion.h>

#include <linux/mutex.h>

#include <linux/poll.h>

#include <linux/idr.h>

#include <linux/in.h>

#include <linux/in6.h>

#include <linux/miscdevice.h>



#include <rdma/rdma_user_cm.h>

#include <rdma/ib_marshall.h>

#include <rdma/rdma_cm.h>



MODULE_AUTHOR("Sean Hefty");

MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");

MODULE_LICENSE("Dual BSD/GPL");



enum {

	UCMA_MAX_BACKLOG	= 128

};



struct ucma_file {

	struct mutex		mut;

	struct file		*filp;

	struct list_head	ctx_list;

	struct list_head	event_list;

	wait_queue_head_t	poll_wait;

};



struct ucma_context {

	int			id;

	struct completion	comp;

	atomic_t		ref;

	int			events_reported;

	int			backlog;



	struct ucma_file	*file;

	struct rdma_cm_id	*cm_id;

	u64			uid;



	struct list_head	list;

};



struct ucma_event {

	struct ucma_context	*ctx;

	struct list_head	list;

	struct rdma_cm_id	*cm_id;

	struct rdma_ucm_event_resp resp;

};



static DEFINE_MUTEX(mut);

static DEFINE_IDR(ctx_idr);



static inline struct ucma_context *_ucma_find_context(int id,

						      struct ucma_file *file)

{

	struct ucma_context *ctx;



	ctx = idr_find(&ctx_idr, id);

	if (!ctx)

		ctx = ERR_PTR(-ENOENT);

	else if (ctx->file != file)

		ctx = ERR_PTR(-EINVAL);

	return ctx;

}



static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)

{

	struct ucma_context *ctx;



	mutex_lock(&mut);

	ctx = _ucma_find_context(id, file);

	if (!IS_ERR(ctx))

		atomic_inc(&ctx->ref);

	mutex_unlock(&mut);

	return ctx;

}



static void ucma_put_ctx(struct ucma_context *ctx)

{

	if (atomic_dec_and_test(&ctx->ref))

		complete(&ctx->comp);

}



static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)

{

	struct ucma_context *ctx;

	int ret;



	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);

	if (!ctx)

		return NULL;



	atomic_set(&ctx->ref, 1);

	init_completion(&ctx->comp);

	ctx->file = file;



	do {

		ret = idr_pre_get(&ctx_idr, GFP_KERNEL);

		if (!ret)

			goto error;



		mutex_lock(&mut);

		ret = idr_get_new(&ctx_idr, ctx, &ctx->id);

		mutex_unlock(&mut);

	} while (ret == -EAGAIN);



	if (ret)

		goto error;



	list_add_tail(&ctx->list, &file->ctx_list);

	return ctx;



error:

	kfree(ctx);

	return NULL;

}



static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,

				 struct rdma_conn_param *src)

{

	if (src->private_data_len)

		memcpy(dst->private_data, src->private_data,

		       src->private_data_len);

	dst->private_data_len = src->private_data_len;

	dst->responder_resources =src->responder_resources;

	dst->initiator_depth = src->initiator_depth;

	dst->flow_control = src->flow_control;

	dst->retry_count = src->retry_count;

	dst->rnr_retry_count = src->rnr_retry_count;

	dst->srq = src->srq;

	dst->qp_num = src->qp_num;

}



static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,

			       struct rdma_ud_param *src)

{

	if (src->private_data_len)

		memcpy(dst->private_data, src->private_data,

		       src->private_data_len);

	dst->private_data_len = src->private_data_len;

	ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);

	dst->qp_num = src->qp_num;

	dst->qkey = src->qkey;

}



static void ucma_set_event_context(struct ucma_context *ctx,

				   struct rdma_cm_event *event,

				   struct ucma_event *uevent)

{

	uevent->ctx = ctx;

	uevent->resp.uid = ctx->uid;

	uevent->resp.id = ctx->id;

}



static int ucma_event_handler(struct rdma_cm_id *cm_id,

			      struct rdma_cm_event *event)

{

	struct ucma_event *uevent;

	struct ucma_context *ctx = cm_id->context;

	int ret = 0;



	uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);

	if (!uevent)

		return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;



	uevent->cm_id = cm_id;

	ucma_set_event_context(ctx, event, uevent);

	uevent->resp.event = event->event;

	uevent->resp.status = event->status;

	if (cm_id->ps == RDMA_PS_UDP)

		ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);

	else

		ucma_copy_conn_event(&uevent->resp.param.conn,

				     &event->param.conn);



	mutex_lock(&ctx->file->mut);

	if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {

		if (!ctx->backlog) {

			ret = -EDQUOT;

			goto out;

		}

		ctx->backlog--;

	}

	list_add_tail(&uevent->list, &ctx->file->event_list);

	wake_up_interruptible(&ctx->file->poll_wait);

out:

	mutex_unlock(&ctx->file->mut);

	return ret;

}



static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,

			      int in_len, int out_len)

{

	struct ucma_context *ctx;

	struct rdma_ucm_get_event cmd;

	struct ucma_event *uevent;

	int ret = 0;

	DEFINE_WAIT(wait);



	if (out_len < sizeof uevent->resp)

		return -ENOSPC;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	mutex_lock(&file->mut);

	while (list_empty(&file->event_list)) {

		if (file->filp->f_flags & O_NONBLOCK) {

			ret = -EAGAIN;

			break;

		}



		if (signal_pending(current)) {

			ret = -ERESTARTSYS;

			break;

		}



		prepare_to_wait(&file->poll_wait, &wait, TASK_INTERRUPTIBLE);

		mutex_unlock(&file->mut);

		schedule();

		mutex_lock(&file->mut);

		finish_wait(&file->poll_wait, &wait);

	}



	if (ret)

		goto done;



	uevent = list_entry(file->event_list.next, struct ucma_event, list);



	if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {

		ctx = ucma_alloc_ctx(file);

		if (!ctx) {

			ret = -ENOMEM;

			goto done;

		}

		uevent->ctx->backlog++;

		ctx->cm_id = uevent->cm_id;

		ctx->cm_id->context = ctx;

		uevent->resp.id = ctx->id;

	}



	if (copy_to_user((void __user *)(unsigned long)cmd.response,

			 &uevent->resp, sizeof uevent->resp)) {

		ret = -EFAULT;

		goto done;

	}



	list_del(&uevent->list);

	uevent->ctx->events_reported++;

	kfree(uevent);

done:

	mutex_unlock(&file->mut);

	return ret;

}



static ssize_t ucma_create_id(struct ucma_file *file,

				const char __user *inbuf,

				int in_len, int out_len)

{

	struct rdma_ucm_create_id cmd;

	struct rdma_ucm_create_id_resp resp;

	struct ucma_context *ctx;

	int ret;



	if (out_len < sizeof(resp))

		return -ENOSPC;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	mutex_lock(&file->mut);

	ctx = ucma_alloc_ctx(file);

	mutex_unlock(&file->mut);

	if (!ctx)

		return -ENOMEM;



	ctx->uid = cmd.uid;

	ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps);

	if (IS_ERR(ctx->cm_id)) {

		ret = PTR_ERR(ctx->cm_id);

		goto err1;

	}



	resp.id = ctx->id;

	if (copy_to_user((void __user *)(unsigned long)cmd.response,

			 &resp, sizeof(resp))) {

		ret = -EFAULT;

		goto err2;

	}

	return 0;



err2:

	rdma_destroy_id(ctx->cm_id);

err1:

	mutex_lock(&mut);

	idr_remove(&ctx_idr, ctx->id);

	mutex_unlock(&mut);

	kfree(ctx);

	return ret;

}



static void ucma_cleanup_events(struct ucma_context *ctx)

{

	struct ucma_event *uevent, *tmp;



	list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {

		if (uevent->ctx != ctx)

			continue;



		list_del(&uevent->list);



		/* clear incoming connections. */

		if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)

			rdma_destroy_id(uevent->cm_id);



		kfree(uevent);

	}

}



static int ucma_free_ctx(struct ucma_context *ctx)

{

	int events_reported;



	/* No new events will be generated after destroying the id. */

	rdma_destroy_id(ctx->cm_id);



	/* Cleanup events not yet reported to the user. */

	mutex_lock(&ctx->file->mut);

	ucma_cleanup_events(ctx);

	list_del(&ctx->list);

	mutex_unlock(&ctx->file->mut);



	events_reported = ctx->events_reported;

	kfree(ctx);

	return events_reported;

}



static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,

			       int in_len, int out_len)

{

	struct rdma_ucm_destroy_id cmd;

	struct rdma_ucm_destroy_id_resp resp;

	struct ucma_context *ctx;

	int ret = 0;



	if (out_len < sizeof(resp))

		return -ENOSPC;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	mutex_lock(&mut);

	ctx = _ucma_find_context(cmd.id, file);

	if (!IS_ERR(ctx))

		idr_remove(&ctx_idr, ctx->id);

	mutex_unlock(&mut);



	if (IS_ERR(ctx))

		return PTR_ERR(ctx);



	ucma_put_ctx(ctx);

	wait_for_completion(&ctx->comp);

	resp.events_reported = ucma_free_ctx(ctx);



	if (copy_to_user((void __user *)(unsigned long)cmd.response,

			 &resp, sizeof(resp)))

		ret = -EFAULT;



	return ret;

}



static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,

			      int in_len, int out_len)

{

	struct rdma_ucm_bind_addr cmd;

	struct ucma_context *ctx;

	int ret;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	ctx = ucma_get_ctx(file, cmd.id);

	if (IS_ERR(ctx))

		return PTR_ERR(ctx);



	ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);

	ucma_put_ctx(ctx);

	return ret;

}



static ssize_t ucma_resolve_addr(struct ucma_file *file,

				 const char __user *inbuf,

				 int in_len, int out_len)

{

	struct rdma_ucm_resolve_addr cmd;

	struct ucma_context *ctx;

	int ret;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	ctx = ucma_get_ctx(file, cmd.id);

	if (IS_ERR(ctx))

		return PTR_ERR(ctx);



	ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,

				(struct sockaddr *) &cmd.dst_addr,

				cmd.timeout_ms);

	ucma_put_ctx(ctx);

	return ret;

}



static ssize_t ucma_resolve_route(struct ucma_file *file,

				  const char __user *inbuf,

				  int in_len, int out_len)

{

	struct rdma_ucm_resolve_route cmd;

	struct ucma_context *ctx;

	int ret;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	ctx = ucma_get_ctx(file, cmd.id);

	if (IS_ERR(ctx))

		return PTR_ERR(ctx);



	ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);

	ucma_put_ctx(ctx);

	return ret;

}



static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,

			       struct rdma_route *route)

{

	struct rdma_dev_addr *dev_addr;



	resp->num_paths = route->num_paths;

	switch (route->num_paths) {

	case 0:

		dev_addr = &route->addr.dev_addr;

		ib_addr_get_dgid(dev_addr,

				 (union ib_gid *) &resp->ib_route[0].dgid);

		ib_addr_get_sgid(dev_addr,

				 (union ib_gid *) &resp->ib_route[0].sgid);

		resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));

		break;

	case 2:

		ib_copy_path_rec_to_user(&resp->ib_route[1],

					 &route->path_rec[1]);

		/* fall through */

	case 1:

		ib_copy_path_rec_to_user(&resp->ib_route[0],

					 &route->path_rec[0]);

		break;

	default:

		break;

	}

}



static ssize_t ucma_query_route(struct ucma_file *file,

				const char __user *inbuf,

				int in_len, int out_len)

{

	struct rdma_ucm_query_route cmd;

	struct rdma_ucm_query_route_resp resp;

	struct ucma_context *ctx;

	struct sockaddr *addr;

	int ret = 0;



	if (out_len < sizeof(resp))

		return -ENOSPC;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	ctx = ucma_get_ctx(file, cmd.id);

	if (IS_ERR(ctx))

		return PTR_ERR(ctx);



	memset(&resp, 0, sizeof resp);

	addr = &ctx->cm_id->route.addr.src_addr;

	memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?

				     sizeof(struct sockaddr_in) :

				     sizeof(struct sockaddr_in6));

	addr = &ctx->cm_id->route.addr.dst_addr;

	memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?

				     sizeof(struct sockaddr_in) :

				     sizeof(struct sockaddr_in6));

	if (!ctx->cm_id->device)

		goto out;



	resp.node_guid = ctx->cm_id->device->node_guid;

	resp.port_num = ctx->cm_id->port_num;

	switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {

	case RDMA_TRANSPORT_IB:

		ucma_copy_ib_route(&resp, &ctx->cm_id->route);

		break;

	default:

		break;

	}



out:

	if (copy_to_user((void __user *)(unsigned long)cmd.response,

			 &resp, sizeof(resp)))

		ret = -EFAULT;



	ucma_put_ctx(ctx);

	return ret;

}



static void ucma_copy_conn_param(struct rdma_conn_param *dst,

				 struct rdma_ucm_conn_param *src)

{

	dst->private_data = src->private_data;

	dst->private_data_len = src->private_data_len;

	dst->responder_resources =src->responder_resources;

	dst->initiator_depth = src->initiator_depth;

	dst->flow_control = src->flow_control;

	dst->retry_count = src->retry_count;

	dst->rnr_retry_count = src->rnr_retry_count;

	dst->srq = src->srq;

	dst->qp_num = src->qp_num;

}



static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,

			    int in_len, int out_len)

{

	struct rdma_ucm_connect cmd;

	struct rdma_conn_param conn_param;

	struct ucma_context *ctx;

	int ret;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	if (!cmd.conn_param.valid)

		return -EINVAL;



	ctx = ucma_get_ctx(file, cmd.id);

	if (IS_ERR(ctx))

		return PTR_ERR(ctx);



	ucma_copy_conn_param(&conn_param, &cmd.conn_param);

	ret = rdma_connect(ctx->cm_id, &conn_param);

	ucma_put_ctx(ctx);

	return ret;

}



static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,

			   int in_len, int out_len)

{

	struct rdma_ucm_listen cmd;

	struct ucma_context *ctx;

	int ret;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	ctx = ucma_get_ctx(file, cmd.id);

	if (IS_ERR(ctx))

		return PTR_ERR(ctx);



	ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ?

		       cmd.backlog : UCMA_MAX_BACKLOG;

	ret = rdma_listen(ctx->cm_id, ctx->backlog);

	ucma_put_ctx(ctx);

	return ret;

}



static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,

			   int in_len, int out_len)

{

	struct rdma_ucm_accept cmd;

	struct rdma_conn_param conn_param;

	struct ucma_context *ctx;

	int ret;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	ctx = ucma_get_ctx(file, cmd.id);

	if (IS_ERR(ctx))

		return PTR_ERR(ctx);



	if (cmd.conn_param.valid) {

		ctx->uid = cmd.uid;

		ucma_copy_conn_param(&conn_param, &cmd.conn_param);

		ret = rdma_accept(ctx->cm_id, &conn_param);

	} else

		ret = rdma_accept(ctx->cm_id, NULL);



	ucma_put_ctx(ctx);

	return ret;

}



static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,

			   int in_len, int out_len)

{

	struct rdma_ucm_reject cmd;

	struct ucma_context *ctx;

	int ret;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	ctx = ucma_get_ctx(file, cmd.id);

	if (IS_ERR(ctx))

		return PTR_ERR(ctx);



	ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);

	ucma_put_ctx(ctx);

	return ret;

}



static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,

			       int in_len, int out_len)

{

	struct rdma_ucm_disconnect cmd;

	struct ucma_context *ctx;

	int ret;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	ctx = ucma_get_ctx(file, cmd.id);

	if (IS_ERR(ctx))

		return PTR_ERR(ctx);



	ret = rdma_disconnect(ctx->cm_id);

	ucma_put_ctx(ctx);

	return ret;

}



static ssize_t ucma_init_qp_attr(struct ucma_file *file,

				 const char __user *inbuf,

				 int in_len, int out_len)

{

	struct rdma_ucm_init_qp_attr cmd;

	struct ib_uverbs_qp_attr resp;

	struct ucma_context *ctx;

	struct ib_qp_attr qp_attr;

	int ret;



	if (out_len < sizeof(resp))

		return -ENOSPC;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	ctx = ucma_get_ctx(file, cmd.id);

	if (IS_ERR(ctx))

		return PTR_ERR(ctx);



	resp.qp_attr_mask = 0;

	memset(&qp_attr, 0, sizeof qp_attr);

	qp_attr.qp_state = cmd.qp_state;

	ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);

	if (ret)

		goto out;



	ib_copy_qp_attr_to_user(&resp, &qp_attr);

	if (copy_to_user((void __user *)(unsigned long)cmd.response,

			 &resp, sizeof(resp)))

		ret = -EFAULT;



out:

	ucma_put_ctx(ctx);

	return ret;

}



static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,

			   int in_len, int out_len)

{

	struct rdma_ucm_notify cmd;

	struct ucma_context *ctx;

	int ret;



	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))

		return -EFAULT;



	ctx = ucma_get_ctx(file, cmd.id);

	if (IS_ERR(ctx))

		return PTR_ERR(ctx);



	ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);

	ucma_put_ctx(ctx);

	return ret;

}



static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,

				   const char __user *inbuf,

				   int in_len, int out_len) = {

	[RDMA_USER_CM_CMD_CREATE_ID]	= ucma_create_id,

	[RDMA_USER_CM_CMD_DESTROY_ID]	= ucma_destroy_id,

	[RDMA_USER_CM_CMD_BIND_ADDR]	= ucma_bind_addr,

	[RDMA_USER_CM_CMD_RESOLVE_ADDR]	= ucma_resolve_addr,

	[RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,

	[RDMA_USER_CM_CMD_QUERY_ROUTE]	= ucma_query_route,

	[RDMA_USER_CM_CMD_CONNECT]	= ucma_connect,

	[RDMA_USER_CM_CMD_LISTEN]	= ucma_listen,

	[RDMA_USER_CM_CMD_ACCEPT]	= ucma_accept,

	[RDMA_USER_CM_CMD_REJECT]	= ucma_reject,

	[RDMA_USER_CM_CMD_DISCONNECT]	= ucma_disconnect,

	[RDMA_USER_CM_CMD_INIT_QP_ATTR]	= ucma_init_qp_attr,

	[RDMA_USER_CM_CMD_GET_EVENT]	= ucma_get_event,

	[RDMA_USER_CM_CMD_GET_OPTION]	= NULL,

	[RDMA_USER_CM_CMD_SET_OPTION]	= NULL,

	[RDMA_USER_CM_CMD_NOTIFY]	= ucma_notify,

};



static ssize_t ucma_write(struct file *filp, const char __user *buf,

			  size_t len, loff_t *pos)

{

	struct ucma_file *file = filp->private_data;

	struct rdma_ucm_cmd_hdr hdr;

	ssize_t ret;



	if (len < sizeof(hdr))

		return -EINVAL;



	if (copy_from_user(&hdr, buf, sizeof(hdr)))

		return -EFAULT;



	if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))

		return -EINVAL;



	if (hdr.in + sizeof(hdr) > len)

		return -EINVAL;



	if (!ucma_cmd_table[hdr.cmd])

		return -ENOSYS;



	ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);

	if (!ret)

		ret = len;



	return ret;

}



static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)

{

	struct ucma_file *file = filp->private_data;

	unsigned int mask = 0;



	poll_wait(filp, &file->poll_wait, wait);



	if (!list_empty(&file->event_list))

		mask = POLLIN | POLLRDNORM;



	return mask;

}



static int ucma_open(struct inode *inode, struct file *filp)

{

	struct ucma_file *file;



	file = kmalloc(sizeof *file, GFP_KERNEL);

	if (!file)

		return -ENOMEM;



	INIT_LIST_HEAD(&file->event_list);

	INIT_LIST_HEAD(&file->ctx_list);

	init_waitqueue_head(&file->poll_wait);

	mutex_init(&file->mut);



	filp->private_data = file;

	file->filp = filp;

	return 0;

}



static int ucma_close(struct inode *inode, struct file *filp)

{

	struct ucma_file *file = filp->private_data;

	struct ucma_context *ctx, *tmp;



	mutex_lock(&file->mut);

	list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {

		mutex_unlock(&file->mut);



		mutex_lock(&mut);

		idr_remove(&ctx_idr, ctx->id);

		mutex_unlock(&mut);



		ucma_free_ctx(ctx);

		mutex_lock(&file->mut);

	}

	mutex_unlock(&file->mut);

	kfree(file);

	return 0;

}



static struct file_operations ucma_fops = {

	.owner 	 = THIS_MODULE,

	.open 	 = ucma_open,

	.release = ucma_close,

	.write	 = ucma_write,

	.poll    = ucma_poll,

};



static struct miscdevice ucma_misc = {

	.minor	= MISC_DYNAMIC_MINOR,

	.name	= "rdma_cm",

	.fops	= &ucma_fops,

};



static ssize_t show_abi_version(struct device *dev,

				struct device_attribute *attr,

				char *buf)

{

	return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);

}

static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);



static int __init ucma_init(void)

{

	int ret;



	ret = misc_register(&ucma_misc);

	if (ret)

		return ret;



	ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);

	if (ret) {

		printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");

		goto err;

	}

	return 0;

err:

	misc_deregister(&ucma_misc);

	return ret;

}



static void __exit ucma_cleanup(void)

{

	device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);

	misc_deregister(&ucma_misc);

	idr_destroy(&ctx_idr);

}



module_init(ucma_init);

module_exit(ucma_cleanup);

drivers/infiniband/core/uverbs_marshall.c

+3 −2
Original line number Diff line number Diff line
@@ -32,7 +32,7 @@ 


#include <rdma/ib_marshall.h>



static void ib_copy_ah_attr_to_user(struct ib_uverbs_ah_attr *dst,

void ib_copy_ah_attr_to_user(struct ib_uverbs_ah_attr *dst,

			     struct ib_ah_attr *src)

{

	memcpy(dst->grh.dgid, src->grh.dgid.raw, sizeof src->grh.dgid);
@@ -47,6 +47,7 @@ static void ib_copy_ah_attr_to_user(struct ib_uverbs_ah_attr *dst, 
	dst->is_global             = src->ah_flags & IB_AH_GRH ? 1 : 0;

	dst->port_num 	    	   = src->port_num;

}

EXPORT_SYMBOL(ib_copy_ah_attr_to_user);



void ib_copy_qp_attr_to_user(struct ib_uverbs_qp_attr *dst,

			     struct ib_qp_attr *src)

include/rdma/ib_marshall.h

+4 −1
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2005 Intel Corporation.  All rights reserved.

 * Copyright (c) 2005-2006 Intel Corporation.  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
@@ -41,6 +41,9 @@ 
void ib_copy_qp_attr_to_user(struct ib_uverbs_qp_attr *dst,

			     struct ib_qp_attr *src);



void ib_copy_ah_attr_to_user(struct ib_uverbs_ah_attr *dst,

			     struct ib_ah_attr *src);



void ib_copy_path_rec_to_user(struct ib_user_path_rec *dst,

			      struct ib_sa_path_rec *src);