[PATCH] IB: Add kernel portion of user CM implementation

Add kernel portion of user CM implementation

Signed-off-by: Libor Michalek <libor@topspin.com>
Signed-off-by: Hal Rosenstock <halr@voltaire.com>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1396 insertions, 0 deletions

diff --git a/drivers/infiniband/core/ucm.c b/drivers/infiniband/core/ucm.c
new file mode 100644
index 000000000000..4b4808a0be43
--- /dev/null
+++ b/drivers/infiniband/core/ucm.c
@@ -0,0 +1,1396 @@
+/*
+ * Copyright (c) 2005 Topspin Communications.  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.
+ *
+ * $Id: ucm.c 2594 2005-06-13 19:46:02Z libor $
+ */
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/poll.h>
+#include <linux/file.h>
+#include <linux/mount.h>
+#include <linux/cdev.h>
+
+#include <asm/uaccess.h>
+
+#include "ucm.h"
+
+MODULE_AUTHOR("Libor Michalek");
+MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
+MODULE_LICENSE("Dual BSD/GPL");
+
+enum {
+	IB_UCM_MAJOR = 231,
+	IB_UCM_MINOR = 255
+};
+
+#define IB_UCM_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_MINOR)
+
+static struct semaphore ctx_id_mutex;
+static struct idr       ctx_id_table;
+static int              ctx_id_rover = 0;
+
+static struct ib_ucm_context *ib_ucm_ctx_get(int id)
+{
+	struct ib_ucm_context *ctx;
+
+	down(&ctx_id_mutex);
+	ctx = idr_find(&ctx_id_table, id);
+	if (ctx)
+		ctx->ref++;
+	up(&ctx_id_mutex);
+
+	return ctx;
+}
+
+static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
+{
+	struct ib_ucm_event *uevent;
+
+	down(&ctx_id_mutex);
+
+	ctx->ref--;
+	if (!ctx->ref)
+		idr_remove(&ctx_id_table, ctx->id);
+
+	up(&ctx_id_mutex);
+
+	if (ctx->ref)
+		return;
+
+	down(&ctx->file->mutex);
+
+	list_del(&ctx->file_list);
+	while (!list_empty(&ctx->events)) {
+
+		uevent = list_entry(ctx->events.next,
+				    struct ib_ucm_event, ctx_list);
+		list_del(&uevent->file_list);
+		list_del(&uevent->ctx_list);
+
+		/* clear incoming connections. */
+		if (uevent->cm_id)
+			ib_destroy_cm_id(uevent->cm_id);
+
+		kfree(uevent);
+	}
+
+	up(&ctx->file->mutex);
+
+	printk(KERN_ERR "UCM: Destroyed CM ID <%d>\n", ctx->id);
+
+	ib_destroy_cm_id(ctx->cm_id);
+	kfree(ctx);
+}
+
+static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
+{
+	struct ib_ucm_context *ctx;
+	int result;
+
+	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return NULL;
+
+	ctx->ref  = 1; /* user reference */
+	ctx->file = file;
+
+	INIT_LIST_HEAD(&ctx->events);
+	init_MUTEX(&ctx->mutex);
+
+	list_add_tail(&ctx->file_list, &file->ctxs);
+
+	ctx_id_rover = (ctx_id_rover + 1) & INT_MAX;
+retry:
+	result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
+	if (!result)
+		goto error;
+
+	down(&ctx_id_mutex);
+	result = idr_get_new_above(&ctx_id_table, ctx, ctx_id_rover, &ctx->id);
+	up(&ctx_id_mutex);
+
+	if (result == -EAGAIN)
+		goto retry;
+	if (result)
+		goto error;
+
+	printk(KERN_ERR "UCM: Allocated CM ID <%d>\n", ctx->id);
+
+	return ctx;
+error:
+	list_del(&ctx->file_list);
+	kfree(ctx);
+
+	return NULL;
+}
+/*
+ * Event portion of the API, handle CM events
+ * and allow event polling.
+ */
+static void ib_ucm_event_path_get(struct ib_ucm_path_rec *upath,
+				  struct ib_sa_path_rec	 *kpath)
+{
+	if (!kpath || !upath)
+		return;
+
+	memcpy(upath->dgid, kpath->dgid.raw, sizeof(union ib_gid));
+	memcpy(upath->sgid, kpath->sgid.raw, sizeof(union ib_gid));
+
+	upath->dlid             = kpath->dlid;
+	upath->slid             = kpath->slid;
+	upath->raw_traffic      = kpath->raw_traffic;
+	upath->flow_label       = kpath->flow_label;
+	upath->hop_limit        = kpath->hop_limit;
+	upath->traffic_class    = kpath->traffic_class;
+	upath->reversible       = kpath->reversible;
+	upath->numb_path        = kpath->numb_path;
+	upath->pkey             = kpath->pkey;
+	upath->sl	        = kpath->sl;
+	upath->mtu_selector     = kpath->mtu_selector;
+	upath->mtu              = kpath->mtu;
+	upath->rate_selector    = kpath->rate_selector;
+	upath->rate             = kpath->rate;
+	upath->packet_life_time = kpath->packet_life_time;
+	upath->preference       = kpath->preference;
+
+	upath->packet_life_time_selector =
+		kpath->packet_life_time_selector;
+}
+
+static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
+				 struct ib_cm_req_event_param *kreq)
+{
+	ureq->listen_id = (long)kreq->listen_id->context;
+
+	ureq->remote_ca_guid             = kreq->remote_ca_guid;
+	ureq->remote_qkey                = kreq->remote_qkey;
+	ureq->remote_qpn                 = kreq->remote_qpn;
+	ureq->qp_type                    = kreq->qp_type;
+	ureq->starting_psn               = kreq->starting_psn;
+	ureq->responder_resources        = kreq->responder_resources;
+	ureq->initiator_depth            = kreq->initiator_depth;
+	ureq->local_cm_response_timeout  = kreq->local_cm_response_timeout;
+	ureq->flow_control               = kreq->flow_control;
+	ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
+	ureq->retry_count                = kreq->retry_count;
+	ureq->rnr_retry_count            = kreq->rnr_retry_count;
+	ureq->srq                        = kreq->srq;
+
+	ib_ucm_event_path_get(&ureq->primary_path, kreq->primary_path);
+	ib_ucm_event_path_get(&ureq->alternate_path, kreq->alternate_path);
+}
+
+static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
+				 struct ib_cm_rep_event_param *krep)
+{
+	urep->remote_ca_guid      = krep->remote_ca_guid;
+	urep->remote_qkey         = krep->remote_qkey;
+	urep->remote_qpn          = krep->remote_qpn;
+	urep->starting_psn        = krep->starting_psn;
+	urep->responder_resources = krep->responder_resources;
+	urep->initiator_depth     = krep->initiator_depth;
+	urep->target_ack_delay    = krep->target_ack_delay;
+	urep->failover_accepted   = krep->failover_accepted;
+	urep->flow_control        = krep->flow_control;
+	urep->rnr_retry_count     = krep->rnr_retry_count;
+	urep->srq                 = krep->srq;
+}
+
+static void ib_ucm_event_rej_get(struct ib_ucm_rej_event_resp *urej,
+				 struct ib_cm_rej_event_param *krej)
+{
+	urej->reason = krej->reason;
+}
+
+static void ib_ucm_event_mra_get(struct ib_ucm_mra_event_resp *umra,
+				 struct ib_cm_mra_event_param *kmra)
+{
+	umra->timeout = kmra->service_timeout;
+}
+
+static void ib_ucm_event_lap_get(struct ib_ucm_lap_event_resp *ulap,
+				 struct ib_cm_lap_event_param *klap)
+{
+	ib_ucm_event_path_get(&ulap->path, klap->alternate_path);
+}
+
+static void ib_ucm_event_apr_get(struct ib_ucm_apr_event_resp *uapr,
+				 struct ib_cm_apr_event_param *kapr)
+{
+	uapr->status = kapr->ap_status;
+}
+
+static void ib_ucm_event_sidr_req_get(struct ib_ucm_sidr_req_event_resp *ureq,
+				      struct ib_cm_sidr_req_event_param *kreq)
+{
+	ureq->listen_id = (long)kreq->listen_id->context;
+	ureq->pkey      = kreq->pkey;
+}
+
+static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
+				      struct ib_cm_sidr_rep_event_param *krep)
+{
+	urep->status = krep->status;
+	urep->qkey   = krep->qkey;
+	urep->qpn    = krep->qpn;
+};
+
+static int ib_ucm_event_process(struct ib_cm_event *evt,
+				struct ib_ucm_event *uvt)
+{
+	void *info = NULL;
+	int result;
+
+	switch (evt->event) {
+	case IB_CM_REQ_RECEIVED:
+		ib_ucm_event_req_get(&uvt->resp.u.req_resp,
+				     &evt->param.req_rcvd);
+		uvt->data_len      = IB_CM_REQ_PRIVATE_DATA_SIZE;
+		uvt->resp.present |= (evt->param.req_rcvd.primary_path ?
+				      IB_UCM_PRES_PRIMARY : 0);
+		uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
+				      IB_UCM_PRES_ALTERNATE : 0);
+		break;
+	case IB_CM_REP_RECEIVED:
+		ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
+				     &evt->param.rep_rcvd);
+		uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
+
+		break;
+	case IB_CM_RTU_RECEIVED:
+		uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
+		uvt->resp.u.send_status = evt->param.send_status;
+
+		break;
+	case IB_CM_DREQ_RECEIVED:
+		uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
+		uvt->resp.u.send_status = evt->param.send_status;
+
+		break;
+	case IB_CM_DREP_RECEIVED:
+		uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
+		uvt->resp.u.send_status = evt->param.send_status;
+
+		break;
+	case IB_CM_MRA_RECEIVED:
+		ib_ucm_event_mra_get(&uvt->resp.u.mra_resp,
+				     &evt->param.mra_rcvd);
+		uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
+
+		break;
+	case IB_CM_REJ_RECEIVED:
+		ib_ucm_event_rej_get(&uvt->resp.u.rej_resp,
+				     &evt->param.rej_rcvd);
+		uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
+		uvt->info_len = evt->param.rej_rcvd.ari_length;
+		info	      = evt->param.rej_rcvd.ari;
+
+		break;
+	case IB_CM_LAP_RECEIVED:
+		ib_ucm_event_lap_get(&uvt->resp.u.lap_resp,
+				     &evt->param.lap_rcvd);
+		uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
+		uvt->resp.present |= (evt->param.lap_rcvd.alternate_path ?
+				      IB_UCM_PRES_ALTERNATE : 0);
+		break;
+	case IB_CM_APR_RECEIVED:
+		ib_ucm_event_apr_get(&uvt->resp.u.apr_resp,
+				     &evt->param.apr_rcvd);
+		uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
+		uvt->info_len = evt->param.apr_rcvd.info_len;
+		info	      = evt->param.apr_rcvd.apr_info;
+
+		break;
+	case IB_CM_SIDR_REQ_RECEIVED:
+		ib_ucm_event_sidr_req_get(&uvt->resp.u.sidr_req_resp,
+					  &evt->param.sidr_req_rcvd);
+		uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
+
+		break;
+	case IB_CM_SIDR_REP_RECEIVED:
+		ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
+					  &evt->param.sidr_rep_rcvd);
+		uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
+		uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
+		info	      = evt->param.sidr_rep_rcvd.info;
+
+		break;
+	default:
+		uvt->resp.u.send_status = evt->param.send_status;
+
+		break;
+	}
+
+	if (uvt->data_len && evt->private_data) {
+
+		uvt->data = kmalloc(uvt->data_len, GFP_KERNEL);
+		if (!uvt->data) {
+			result = -ENOMEM;
+			goto error;
+		}
+
+		memcpy(uvt->data, evt->private_data, uvt->data_len);
+		uvt->resp.present |= IB_UCM_PRES_DATA;
+	}
+
+	if (uvt->info_len && info) {
+
+		uvt->info = kmalloc(uvt->info_len, GFP_KERNEL);
+		if (!uvt->info) {
+			result = -ENOMEM;
+			goto error;
+		}
+
+		memcpy(uvt->info, info, uvt->info_len);
+		uvt->resp.present |= IB_UCM_PRES_INFO;
+	}
+
+	return 0;
+error:
+	if (uvt->info)
+		kfree(uvt->info);
+	if (uvt->data)
+		kfree(uvt->data);
+	return result;
+}
+
+static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
+				struct ib_cm_event *event)
+{
+	struct ib_ucm_event *uevent;
+	struct ib_ucm_context *ctx;
+	int result = 0;
+	int id;
+	/*
+	 * lookup correct context based on event type.
+	 */
+	switch (event->event) {
+	case IB_CM_REQ_RECEIVED:
+		id = (long)event->param.req_rcvd.listen_id->context;
+		break;
+	case IB_CM_SIDR_REQ_RECEIVED:
+		id = (long)event->param.sidr_req_rcvd.listen_id->context;
+		break;
+	default:
+		id = (long)cm_id->context;
+		break;
+	}
+
+	printk(KERN_ERR "UCM: Event. CM ID <%d> event <%d>\n",
+	       id, event->event);
+
+	ctx = ib_ucm_ctx_get(id);
+	if (!ctx)
+		return -ENOENT;
+
+	if (event->event == IB_CM_REQ_RECEIVED ||
+	    event->event == IB_CM_SIDR_REQ_RECEIVED)
+		id = IB_UCM_CM_ID_INVALID;
+
+	uevent = kmalloc(sizeof(*uevent), GFP_KERNEL);
+	if (!uevent) {
+		result = -ENOMEM;
+		goto done;
+	}
+
+	memset(uevent, 0, sizeof(*uevent));
+
+	uevent->resp.id    = id;
+	uevent->resp.event = event->event;
+
+	result = ib_ucm_event_process(event, uevent);
+	if (result)
+		goto done;
+
+	uevent->ctx   = ctx;
+	uevent->cm_id = ((event->event == IB_CM_REQ_RECEIVED ||
+			  event->event == IB_CM_SIDR_REQ_RECEIVED ) ?
+			 cm_id : NULL);
+
+	down(&ctx->file->mutex);
+
+	list_add_tail(&uevent->file_list, &ctx->file->events);
+	list_add_tail(&uevent->ctx_list, &ctx->events);
+
+	wake_up_interruptible(&ctx->file->poll_wait);
+
+	up(&ctx->file->mutex);
+done:
+	ctx->error = result;
+	ib_ucm_ctx_put(ctx); /* func reference */
+	return result;
+}
+
+static ssize_t ib_ucm_event(struct ib_ucm_file *file,
+			    const char __user *inbuf,
+			    int in_len, int out_len)
+{
+	struct ib_ucm_context *ctx;
+	struct ib_ucm_event_get cmd;
+	struct ib_ucm_event *uevent = NULL;
+	int result = 0;
+	DEFINE_WAIT(wait);
+
+	if (out_len < sizeof(struct ib_ucm_event_resp))
+		return -ENOSPC;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+	/*
+	 * wait
+	 */
+	down(&file->mutex);
+
+	while (list_empty(&file->events)) {
+
+		if (file->filp->f_flags & O_NONBLOCK) {
+			result = -EAGAIN;
+			break;
+		}
+
+		if (signal_pending(current)) {
+			result = -ERESTARTSYS;
+			break;
+		}
+
+		prepare_to_wait(&file->poll_wait, &wait, TASK_INTERRUPTIBLE);
+
+		up(&file->mutex);
+		schedule();
+		down(&file->mutex);
+
+		finish_wait(&file->poll_wait, &wait);
+	}
+
+	if (result)
+		goto done;
+
+	uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
+
+	if (!uevent->cm_id)
+		goto user;
+
+	ctx = ib_ucm_ctx_alloc(file);
+	if (!ctx) {
+		result = -ENOMEM;
+		goto done;
+	}
+
+	ctx->cm_id             = uevent->cm_id;
+	ctx->cm_id->cm_handler = ib_ucm_event_handler;
+	ctx->cm_id->context    = (void *)(unsigned long)ctx->id;
+
+	uevent->resp.id = ctx->id;
+
+user:
+	if (copy_to_user((void __user *)(unsigned long)cmd.response,
+			 &uevent->resp, sizeof(uevent->resp))) {
+		result = -EFAULT;
+		goto done;
+	}
+
+	if (uevent->data) {
+
+		if (cmd.data_len < uevent->data_len) {
+			result = -ENOMEM;
+			goto done;
+		}
+
+		if (copy_to_user((void __user *)(unsigned long)cmd.data,
+				 uevent->data, uevent->data_len)) {
+			result = -EFAULT;
+			goto done;
+		}
+	}
+
+	if (uevent->info) {
+
+		if (cmd.info_len < uevent->info_len) {
+			result = -ENOMEM;
+			goto done;
+		}
+
+		if (copy_to_user((void __user *)(unsigned long)cmd.info,
+				 uevent->info, uevent->info_len)) {
+			result = -EFAULT;
+			goto done;
+		}
+	}
+
+	list_del(&uevent->file_list);
+	list_del(&uevent->ctx_list);
+
+	if (uevent->data)
+		kfree(uevent->data);
+	if (uevent->info)
+		kfree(uevent->info);
+	kfree(uevent);
+done:
+	up(&file->mutex);
+	return result;
+}
+
+
+static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
+				const char __user *inbuf,
+				int in_len, int out_len)
+{
+	struct ib_ucm_create_id cmd;
+	struct ib_ucm_create_id_resp resp;
+	struct ib_ucm_context *ctx;
+	int result;
+
+	if (out_len < sizeof(resp))
+		return -ENOSPC;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	ctx = ib_ucm_ctx_alloc(file);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->cm_id = ib_create_cm_id(ib_ucm_event_handler,
+				     (void *)(unsigned long)ctx->id);
+	if (!ctx->cm_id) {
+		result = -ENOMEM;
+		goto err_cm;
+	}
+
+	resp.id = ctx->id;
+	if (copy_to_user((void __user *)(unsigned long)cmd.response,
+			 &resp, sizeof(resp))) {
+		result = -EFAULT;
+		goto err_ret;
+	}
+
+	return 0;
+err_ret:
+	ib_destroy_cm_id(ctx->cm_id);
+err_cm:
+	ib_ucm_ctx_put(ctx); /* user reference */
+
+	return result;
+}
+
+static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
+				 const char __user *inbuf,
+				 int in_len, int out_len)
+{
+	struct ib_ucm_destroy_id cmd;
+	struct ib_ucm_context *ctx;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	ctx = ib_ucm_ctx_get(cmd.id);
+	if (!ctx)
+		return -ENOENT;
+
+	ib_ucm_ctx_put(ctx); /* user reference */
+	ib_ucm_ctx_put(ctx); /* func reference */
+
+	return 0;
+}
+
+static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
+			      const char __user *inbuf,
+			      int in_len, int out_len)
+{
+	struct ib_ucm_attr_id_resp resp;
+	struct ib_ucm_attr_id cmd;
+	struct ib_ucm_context *ctx;
+	int result = 0;
+
+	if (out_len < sizeof(resp))
+		return -ENOSPC;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	ctx = ib_ucm_ctx_get(cmd.id);
+	if (!ctx)
+		return -ENOENT;
+
+ 	down(&ctx->file->mutex);
+	if (ctx->file != file) {
+		result = -EINVAL;
+		goto done;
+	}
+
+	resp.service_id   = ctx->cm_id->service_id;
+	resp.service_mask = ctx->cm_id->service_mask;
+	resp.local_id     = ctx->cm_id->local_id;
+	resp.remote_id    = ctx->cm_id->remote_id;
+
+	if (copy_to_user((void __user *)(unsigned long)cmd.response,
+			 &resp, sizeof(resp)))
+		result = -EFAULT;
+
+done:
+	up(&ctx->file->mutex);
+	ib_ucm_ctx_put(ctx); /* func reference */
+	return result;
+}
+
+static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
+			     const char __user *inbuf,
+			     int in_len, int out_len)
+{
+	struct ib_ucm_listen cmd;
+	struct ib_ucm_context *ctx;
+	int result;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	ctx = ib_ucm_ctx_get(cmd.id);
+	if (!ctx)
+		return -ENOENT;
+
+ 	down(&ctx->file->mutex);
+	if (ctx->file != file)
+		result = -EINVAL;
+	else
+		result = ib_cm_listen(ctx->cm_id, cmd.service_id,
+				      cmd.service_mask);
+
+	up(&ctx->file->mutex);
+	ib_ucm_ctx_put(ctx); /* func reference */
+	return result;
+}
+
+static ssize_t ib_ucm_establish(struct ib_ucm_file *file,
+				const char __user *inbuf,
+				int in_len, int out_len)
+{
+	struct ib_ucm_establish cmd;
+	struct ib_ucm_context *ctx;
+	int result;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	ctx = ib_ucm_ctx_get(cmd.id);
+	if (!ctx)
+		return -ENOENT;
+
+ 	down(&ctx->file->mutex);
+	if (ctx->file != file)
+		result = -EINVAL;
+	else
+		result = ib_cm_establish(ctx->cm_id);
+
+	up(&ctx->file->mutex);
+	ib_ucm_ctx_put(ctx); /* func reference */
+	return result;
+}
+
+static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
+{
+	void *data;
+
+	*dest = NULL;
+
+	if (!len)
+		return 0;
+
+	data = kmalloc(len, GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	if (copy_from_user(data, (void __user *)(unsigned long)src, len)) {
+		kfree(data);
+		return -EFAULT;
+	}
+
+	*dest = data;
+	return 0;
+}
+
+static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
+{
+	struct ib_ucm_path_rec ucm_path;
+	struct ib_sa_path_rec  *sa_path;
+
+	*path = NULL;
+
+	if (!src)
+		return 0;
+
+	sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
+	if (!sa_path)
+		return -ENOMEM;
+
+	if (copy_from_user(&ucm_path, (void __user *)(unsigned long)src,
+			   sizeof(ucm_path))) {
+
+		kfree(sa_path);
+		return -EFAULT;
+	}
+
+	memcpy(sa_path->dgid.raw, ucm_path.dgid, sizeof(union ib_gid));
+	memcpy(sa_path->sgid.raw, ucm_path.sgid, sizeof(union ib_gid));
+
+	sa_path->dlid	          = ucm_path.dlid;
+	sa_path->slid	          = ucm_path.slid;
+	sa_path->raw_traffic      = ucm_path.raw_traffic;
+	sa_path->flow_label       = ucm_path.flow_label;
+	sa_path->hop_limit        = ucm_path.hop_limit;
+	sa_path->traffic_class    = ucm_path.traffic_class;
+	sa_path->reversible       = ucm_path.reversible;
+	sa_path->numb_path        = ucm_path.numb_path;
+	sa_path->pkey             = ucm_path.pkey;
+	sa_path->sl               = ucm_path.sl;
+	sa_path->mtu_selector     = ucm_path.mtu_selector;
+	sa_path->mtu              = ucm_path.mtu;
+	sa_path->rate_selector    = ucm_path.rate_selector;
+	sa_path->rate             = ucm_path.rate;
+	sa_path->packet_life_time = ucm_path.packet_life_time;
+	sa_path->preference       = ucm_path.preference;
+
+	sa_path->packet_life_time_selector =
+		ucm_path.packet_life_time_selector;
+
+	*path = sa_path;
+	return 0;
+}
+
+static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
+			       const char __user *inbuf,
+			       int in_len, int out_len)
+{
+	struct ib_cm_req_param param;
+	struct ib_ucm_context *ctx;
+	struct ib_ucm_req cmd;
+	int result;
+
+	param.private_data   = NULL;
+	param.primary_path   = NULL;
+	param.alternate_path = NULL;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
+	if (result)
+		goto done;
+
+	result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
+	if (result)
+		goto done;
+
+	result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
+	if (result)
+		goto done;
+
+	param.private_data_len           = cmd.len;
+	param.service_id                 = cmd.sid;
+	param.qp_num                     = cmd.qpn;
+	param.qp_type                    = cmd.qp_type;
+	param.starting_psn               = cmd.psn;
+	param.peer_to_peer               = cmd.peer_to_peer;
+	param.responder_resources        = cmd.responder_resources;
+	param.initiator_depth            = cmd.initiator_depth;
+	param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
+	param.flow_control               = cmd.flow_control;
+	param.local_cm_response_timeout  = cmd.local_cm_response_timeout;
+	param.retry_count                = cmd.retry_count;
+	param.rnr_retry_count            = cmd.rnr_retry_count;
+	param.max_cm_retries             = cmd.max_cm_retries;
+	param.srq                        = cmd.srq;
+
+	ctx = ib_ucm_ctx_get(cmd.id);
+	if (!ctx) {
+		result = -ENOENT;
+		goto done;
+	}
+
+ 	down(&ctx->file->mutex);
+	if (ctx->file != file)
+		result = -EINVAL;
+	else
+		result = ib_send_cm_req(ctx->cm_id, &param);
+
+	up(&ctx->file->mutex);
+	ib_ucm_ctx_put(ctx); /* func reference */
+done:
+	if (param.private_data)
+		kfree(param.private_data);
+	if (param.primary_path)
+		kfree(param.primary_path);
+	if (param.alternate_path)
+		kfree(param.alternate_path);
+
+	return result;
+}
+
+static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
+			       const char __user *inbuf,
+			       int in_len, int out_len)
+{
+	struct ib_cm_rep_param param;
+	struct ib_ucm_context *ctx;
+	struct ib_ucm_rep cmd;
+	int result;
+
+	param.private_data = NULL;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
+	if (result)
+		return result;
+
+	param.qp_num              = cmd.qpn;
+	param.starting_psn        = cmd.psn;
+	param.private_data_len    = cmd.len;
+	param.responder_resources = cmd.responder_resources;
+	param.initiator_depth     = cmd.initiator_depth;
+	param.target_ack_delay    = cmd.target_ack_delay;
+	param.failover_accepted   = cmd.failover_accepted;
+	param.flow_control        = cmd.flow_control;
+	param.rnr_retry_count     = cmd.rnr_retry_count;
+	param.srq                 = cmd.srq;
+
+	ctx = ib_ucm_ctx_get(cmd.id);
+	if (!ctx) {
+		result = -ENOENT;
+		goto done;
+	}
+
+ 	down(&ctx->file->mutex);
+	if (ctx->file != file)
+		result = -EINVAL;
+	else
+		result = ib_send_cm_rep(ctx->cm_id, &param);
+
+	up(&ctx->file->mutex);
+	ib_ucm_ctx_put(ctx); /* func reference */
+done:
+	if (param.private_data)
+		kfree(param.private_data);
+
+	return result;
+}
+
+static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
+					const char __user *inbuf, int in_len,
+					int (*func)(struct ib_cm_id *cm_id,
+						    const void *private_data,
+						    u8 private_data_len))
+{
+	struct ib_ucm_private_data cmd;
+	struct ib_ucm_context *ctx;
+	const void *private_data = NULL;
+	int result;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
+	if (result)
+		return result;
+
+	ctx = ib_ucm_ctx_get(cmd.id);
+	if (!ctx) {
+		result = -ENOENT;
+		goto done;
+	}
+
+ 	down(&ctx->file->mutex);
+	if (ctx->file != file)
+		result = -EINVAL;
+	else
+		result = func(ctx->cm_id, private_data, cmd.len);
+
+	up(&ctx->file->mutex);
+	ib_ucm_ctx_put(ctx); /* func reference */
+done:
+	if (private_data)
+		kfree(private_data);
+
+	return result;
+}
+
+static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
+			       const char __user *inbuf,
+			       int in_len, int out_len)
+{
+	return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
+}
+
+static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
+				const char __user *inbuf,
+				int in_len, int out_len)
+{
+	return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
+}
+
+static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
+				const char __user *inbuf,
+				int in_len, int out_len)
+{
+	return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
+}
+
+static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
+				const char __user *inbuf, int in_len,
+				int (*func)(struct ib_cm_id *cm_id,
+					    int status,
+					    const void *info,
+					    u8 info_len,
+					    const void *data,
+					    u8 data_len))
+{
+	struct ib_ucm_context *ctx;
+	struct ib_ucm_info cmd;
+	const void *data = NULL;
+	const void *info = NULL;
+	int result;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
+	if (result)
+		goto done;
+
+	result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
+	if (result)
+		goto done;
+
+	ctx = ib_ucm_ctx_get(cmd.id);
+	if (!ctx) {
+		result = -ENOENT;
+		goto done;
+	}
+
+ 	down(&ctx->file->mutex);
+	if (ctx->file != file)
+		result = -EINVAL;
+	else
+		result = func(ctx->cm_id, cmd.status,
+			      info, cmd.info_len,
+			      data, cmd.data_len);
+
+	up(&ctx->file->mutex);
+	ib_ucm_ctx_put(ctx); /* func reference */
+done:
+	if (data)
+		kfree(data);
+	if (info)
+		kfree(info);
+
+	return result;
+}
+
+static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
+			       const char __user *inbuf,
+			       int in_len, int out_len)
+{
+	return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
+}
+
+static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
+			       const char __user *inbuf,
+			       int in_len, int out_len)
+{
+	return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
+}
+
+static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
+			       const char __user *inbuf,
+			       int in_len, int out_len)
+{
+	struct ib_ucm_context *ctx;
+	struct ib_ucm_mra cmd;
+	const void *data = NULL;
+	int result;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
+	if (result)
+		return result;
+
+	ctx = ib_ucm_ctx_get(cmd.id);
+	if (!ctx) {
+		result = -ENOENT;
+		goto done;
+	}
+
+ 	down(&ctx->file->mutex);
+	if (ctx->file != file)
+		result = -EINVAL;
+	else
+		result = ib_send_cm_mra(ctx->cm_id, cmd.timeout,
+					data, cmd.len);
+
+	up(&ctx->file->mutex);
+	ib_ucm_ctx_put(ctx); /* func reference */
+done:
+	if (data)
+		kfree(data);
+
+	return result;
+}
+
+static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
+			       const char __user *inbuf,
+			       int in_len, int out_len)
+{
+	struct ib_ucm_context *ctx;
+	struct ib_sa_path_rec *path = NULL;
+	struct ib_ucm_lap cmd;
+	const void *data = NULL;
+	int result;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
+	if (result)
+		goto done;
+
+	result = ib_ucm_path_get(&path, cmd.path);
+	if (result)
+		goto done;
+
+	ctx = ib_ucm_ctx_get(cmd.id);
+	if (!ctx) {
+		result = -ENOENT;
+		goto done;
+	}
+
+ 	down(&ctx->file->mutex);
+	if (ctx->file != file)
+		result = -EINVAL;
+	else
+		result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
+
+	up(&ctx->file->mutex);
+	ib_ucm_ctx_put(ctx); /* func reference */
+done:
+	if (data)
+		kfree(data);
+	if (path)
+		kfree(path);
+
+	return result;
+}
+
+static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
+				    const char __user *inbuf,
+				    int in_len, int out_len)
+{
+	struct ib_cm_sidr_req_param param;
+	struct ib_ucm_context *ctx;
+	struct ib_ucm_sidr_req cmd;
+	int result;
+
+	param.private_data = NULL;
+	param.path = NULL;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
+	if (result)
+		goto done;
+
+	result = ib_ucm_path_get(&param.path, cmd.path);
+	if (result)
+		goto done;
+
+	param.private_data_len = cmd.len;
+	param.service_id       = cmd.sid;
+	param.timeout_ms       = cmd.timeout;
+	param.max_cm_retries   = cmd.max_cm_retries;
+	param.pkey             = cmd.pkey;
+
+	ctx = ib_ucm_ctx_get(cmd.id);
+	if (!ctx) {
+		result = -ENOENT;
+		goto done;
+	}
+
+ 	down(&ctx->file->mutex);
+	if (ctx->file != file)
+		result = -EINVAL;
+	else
+		result = ib_send_cm_sidr_req(ctx->cm_id, &param);
+
+	up(&ctx->file->mutex);
+	ib_ucm_ctx_put(ctx); /* func reference */
+done:
+	if (param.private_data)
+		kfree(param.private_data);
+	if (param.path)
+		kfree(param.path);
+
+	return result;
+}
+
+static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
+				    const char __user *inbuf,
+				    int in_len, int out_len)
+{
+	struct ib_cm_sidr_rep_param param;
+	struct ib_ucm_sidr_rep cmd;
+	struct ib_ucm_context *ctx;
+	int result;
+
+	param.info = NULL;
+
+	if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+		return -EFAULT;
+
+	result = ib_ucm_alloc_data(&param.private_data,
+				   cmd.data, cmd.data_len);
+	if (result)
+		goto done;
+
+	result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
+	if (result)
+		goto done;
+
+	param.qp_num	   = cmd.qpn;
+	param.qkey	     = cmd.qkey;
+	param.status	   = cmd.status;
+	param.info_length      = cmd.info_len;
+	param.private_data_len = cmd.data_len;
+
+	ctx = ib_ucm_ctx_get(cmd.id);
+	if (!ctx) {
+		result = -ENOENT;
+		goto done;
+	}
+
+ 	down(&ctx->file->mutex);
+	if (ctx->file != file)
+		result = -EINVAL;
+	else
+		result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
+
+	up(&ctx->file->mutex);
+	ib_ucm_ctx_put(ctx); /* func reference */
+done:
+	if (param.private_data)
+		kfree(param.private_data);
+	if (param.info)
+		kfree(param.info);
+
+	return result;
+}
+
+static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
+				  const char __user *inbuf,
+				  int in_len, int out_len) = {
+	[IB_USER_CM_CMD_CREATE_ID]     = ib_ucm_create_id,
+	[IB_USER_CM_CMD_DESTROY_ID]    = ib_ucm_destroy_id,
+	[IB_USER_CM_CMD_ATTR_ID]       = ib_ucm_attr_id,
+	[IB_USER_CM_CMD_LISTEN]        = ib_ucm_listen,
+	[IB_USER_CM_CMD_ESTABLISH]     = ib_ucm_establish,
+	[IB_USER_CM_CMD_SEND_REQ]      = ib_ucm_send_req,
+	[IB_USER_CM_CMD_SEND_REP]      = ib_ucm_send_rep,
+	[IB_USER_CM_CMD_SEND_RTU]      = ib_ucm_send_rtu,
+	[IB_USER_CM_CMD_SEND_DREQ]     = ib_ucm_send_dreq,
+	[IB_USER_CM_CMD_SEND_DREP]     = ib_ucm_send_drep,
+	[IB_USER_CM_CMD_SEND_REJ]      = ib_ucm_send_rej,
+	[IB_USER_CM_CMD_SEND_MRA]      = ib_ucm_send_mra,
+	[IB_USER_CM_CMD_SEND_LAP]      = ib_ucm_send_lap,
+	[IB_USER_CM_CMD_SEND_APR]      = ib_ucm_send_apr,
+	[IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
+	[IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
+	[IB_USER_CM_CMD_EVENT]	       = ib_ucm_event,
+};
+
+static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
+			    size_t len, loff_t *pos)
+{
+	struct ib_ucm_file *file = filp->private_data;
+	struct ib_ucm_cmd_hdr hdr;
+	ssize_t result;
+
+	if (len < sizeof(hdr))
+		return -EINVAL;
+
+	if (copy_from_user(&hdr, buf, sizeof(hdr)))
+		return -EFAULT;
+
+	printk(KERN_ERR "UCM: Write. cmd <%d> in <%d> out <%d> len <%Zu>\n",
+	       hdr.cmd, hdr.in, hdr.out, len);
+
+	if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
+		return -EINVAL;
+
+	if (hdr.in + sizeof(hdr) > len)
+		return -EINVAL;
+
+	result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
+					hdr.in, hdr.out);
+	if (!result)
+		result = len;
+
+	return result;
+}
+
+static unsigned int ib_ucm_poll(struct file *filp,
+				struct poll_table_struct *wait)
+{
+	struct ib_ucm_file *file = filp->private_data;
+	unsigned int mask = 0;
+
+	poll_wait(filp, &file->poll_wait, wait);
+
+	if (!list_empty(&file->events))
+		mask = POLLIN | POLLRDNORM;
+
+	return mask;
+}
+
+static int ib_ucm_open(struct inode *inode, struct file *filp)
+{
+	struct ib_ucm_file *file;
+
+	file = kmalloc(sizeof(*file), GFP_KERNEL);
+	if (!file)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&file->events);
+	INIT_LIST_HEAD(&file->ctxs);
+	init_waitqueue_head(&file->poll_wait);
+
+	init_MUTEX(&file->mutex);
+
+	filp->private_data = file;
+	file->filp = filp;
+
+	printk(KERN_ERR "UCM: Created struct\n");
+
+	return 0;
+}
+
+static int ib_ucm_close(struct inode *inode, struct file *filp)
+{
+	struct ib_ucm_file *file = filp->private_data;
+	struct ib_ucm_context *ctx;
+
+	down(&file->mutex);
+
+	while (!list_empty(&file->ctxs)) {
+
+		ctx = list_entry(file->ctxs.next,
+				 struct ib_ucm_context, file_list);
+
+		up(&ctx->file->mutex);
+		ib_ucm_ctx_put(ctx); /* user reference */
+		down(&file->mutex);
+	}
+
+	up(&file->mutex);
+
+	kfree(file);
+
+	printk(KERN_ERR "UCM: Deleted struct\n");
+	return 0;
+}
+
+static struct file_operations ib_ucm_fops = {
+	.owner 	 = THIS_MODULE,
+	.open 	 = ib_ucm_open,
+	.release = ib_ucm_close,
+	.write 	 = ib_ucm_write,
+	.poll    = ib_ucm_poll,
+};
+
+
+static struct class_simple *ib_ucm_class;
+static struct cdev	  ib_ucm_cdev;
+
+static int __init ib_ucm_init(void)
+{
+	int result;
+
+	result = register_chrdev_region(IB_UCM_DEV, 1, "infiniband_cm");
+	if (result) {
+		printk(KERN_ERR "UCM: Error <%d> registering dev\n", result);
+		goto err_chr;
+	}
+
+	cdev_init(&ib_ucm_cdev, &ib_ucm_fops);
+
+	result = cdev_add(&ib_ucm_cdev, IB_UCM_DEV, 1);
+	if (result) {
+		printk(KERN_ERR "UCM: Error <%d> adding cdev\n", result);
+		goto err_cdev;
+	}
+
+	ib_ucm_class = class_simple_create(THIS_MODULE, "infiniband_cm");
+	if (IS_ERR(ib_ucm_class)) {
+		result = PTR_ERR(ib_ucm_class);
+		printk(KERN_ERR "UCM: Error <%d> creating class\n", result);
+		goto err_class;
+	}
+
+	class_simple_device_add(ib_ucm_class,
+				IB_UCM_DEV,
+				NULL,
+				"ucm");
+
+	idr_init(&ctx_id_table);
+	init_MUTEX(&ctx_id_mutex);
+
+	return 0;
+err_class:
+	cdev_del(&ib_ucm_cdev);
+err_cdev:
+	unregister_chrdev_region(IB_UCM_DEV, 1);
+err_chr:
+	return result;
+}
+
+static void __exit ib_ucm_cleanup(void)
+{
+	class_simple_device_remove(IB_UCM_DEV);
+	class_simple_destroy(ib_ucm_class);
+	cdev_del(&ib_ucm_cdev);
+	unregister_chrdev_region(IB_UCM_DEV, 1);
+}
+
+module_init(ib_ucm_init);
+module_exit(ib_ucm_cleanup);