user_mad.c 33.2 KB
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/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
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 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
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 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
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 * Copyright (c) 2008 Cisco. All rights reserved.
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 *
 * 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.
 */

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#define pr_fmt(fmt) "user_mad: " fmt

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#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/dma-mapping.h>
#include <linux/poll.h>
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#include <linux/mutex.h>
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#include <linux/kref.h>
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#include <linux/compat.h>
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#include <linux/sched.h>
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#include <linux/semaphore.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>

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#include <rdma/ib_mad.h>
#include <rdma/ib_user_mad.h>
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MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
MODULE_LICENSE("Dual BSD/GPL");

enum {
	IB_UMAD_MAX_PORTS  = 64,
	IB_UMAD_MAX_AGENTS = 32,

	IB_UMAD_MAJOR      = 231,
	IB_UMAD_MINOR_BASE = 0
};

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/*
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 * Our lifetime rules for these structs are the following:
 * device special file is opened, we take a reference on the
 * ib_umad_port's struct ib_umad_device. We drop these
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 * references in the corresponding close().
 *
 * In addition to references coming from open character devices, there
 * is one more reference to each ib_umad_device representing the
 * module's reference taken when allocating the ib_umad_device in
 * ib_umad_add_one().
 *
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 * When destroying an ib_umad_device, we drop the module's reference.
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 */

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struct ib_umad_port {
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	struct cdev           cdev;
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	struct device	      *dev;
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	struct cdev           sm_cdev;
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	struct device	      *sm_dev;
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	struct semaphore       sm_sem;

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	struct mutex	       file_mutex;
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	struct list_head       file_list;

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	struct ib_device      *ib_dev;
	struct ib_umad_device *umad_dev;
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	int                    dev_num;
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	u8                     port_num;
};

struct ib_umad_device {
	int                  start_port, end_port;
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	struct kobject       kobj;
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	struct ib_umad_port  port[0];
};

struct ib_umad_file {
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	struct mutex		mutex;
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	struct ib_umad_port    *port;
	struct list_head	recv_list;
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	struct list_head	send_list;
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	struct list_head	port_list;
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	spinlock_t		send_lock;
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	wait_queue_head_t	recv_wait;
	struct ib_mad_agent    *agent[IB_UMAD_MAX_AGENTS];
	int			agents_dead;
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	u8			use_pkey_index;
	u8			already_used;
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};

struct ib_umad_packet {
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	struct ib_mad_send_buf *msg;
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	struct ib_mad_recv_wc  *recv_wc;
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	struct list_head   list;
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	int		   length;
	struct ib_user_mad mad;
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};

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static struct class *umad_class;

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static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
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static DEFINE_SPINLOCK(port_lock);
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static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
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static void ib_umad_add_one(struct ib_device *device);
static void ib_umad_remove_one(struct ib_device *device);

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static void ib_umad_release_dev(struct kobject *kobj)
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{
	struct ib_umad_device *dev =
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		container_of(kobj, struct ib_umad_device, kobj);
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	kfree(dev);
}

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static struct kobj_type ib_umad_dev_ktype = {
	.release = ib_umad_release_dev,
};

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static int hdr_size(struct ib_umad_file *file)
{
	return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
		sizeof (struct ib_user_mad_hdr_old);
}

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/* caller must hold file->mutex */
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static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
{
	return file->agents_dead ? NULL : file->agent[id];
}

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static int queue_packet(struct ib_umad_file *file,
			struct ib_mad_agent *agent,
			struct ib_umad_packet *packet)
{
	int ret = 1;

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	mutex_lock(&file->mutex);
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	for (packet->mad.hdr.id = 0;
	     packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
	     packet->mad.hdr.id++)
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		if (agent == __get_agent(file, packet->mad.hdr.id)) {
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			list_add_tail(&packet->list, &file->recv_list);
			wake_up_interruptible(&file->recv_wait);
			ret = 0;
			break;
		}

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	mutex_unlock(&file->mutex);
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	return ret;
}

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static void dequeue_send(struct ib_umad_file *file,
			 struct ib_umad_packet *packet)
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{
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	spin_lock_irq(&file->send_lock);
	list_del(&packet->list);
	spin_unlock_irq(&file->send_lock);
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}
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static void send_handler(struct ib_mad_agent *agent,
			 struct ib_mad_send_wc *send_wc)
{
	struct ib_umad_file *file = agent->context;
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	struct ib_umad_packet *packet = send_wc->send_buf->context[0];
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	dequeue_send(file, packet);
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	ib_destroy_ah(packet->msg->ah);
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	ib_free_send_mad(packet->msg);
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	if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
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		packet->length = IB_MGMT_MAD_HDR;
		packet->mad.hdr.status = ETIMEDOUT;
		if (!queue_packet(file, agent, packet))
			return;
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	}
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	kfree(packet);
}

static void recv_handler(struct ib_mad_agent *agent,
			 struct ib_mad_recv_wc *mad_recv_wc)
{
	struct ib_umad_file *file = agent->context;
	struct ib_umad_packet *packet;

	if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
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		goto err1;
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	packet = kzalloc(sizeof *packet, GFP_KERNEL);
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	if (!packet)
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		goto err1;
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	packet->length = mad_recv_wc->mad_len;
	packet->recv_wc = mad_recv_wc;
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	packet->mad.hdr.status	   = 0;
	packet->mad.hdr.length	   = hdr_size(file) + mad_recv_wc->mad_len;
	packet->mad.hdr.qpn	   = cpu_to_be32(mad_recv_wc->wc->src_qp);
	packet->mad.hdr.lid	   = cpu_to_be16(mad_recv_wc->wc->slid);
	packet->mad.hdr.sl	   = mad_recv_wc->wc->sl;
	packet->mad.hdr.path_bits  = mad_recv_wc->wc->dlid_path_bits;
	packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
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	packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
	if (packet->mad.hdr.grh_present) {
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		struct ib_ah_attr ah_attr;

		ib_init_ah_from_wc(agent->device, agent->port_num,
				   mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
				   &ah_attr);

		packet->mad.hdr.gid_index = ah_attr.grh.sgid_index;
		packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit;
		packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class;
		memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16);
		packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label);
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	}

	if (queue_packet(file, agent, packet))
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		goto err2;
	return;
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err2:
	kfree(packet);
err1:
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	ib_free_recv_mad(mad_recv_wc);
}

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static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
			     struct ib_umad_packet *packet, size_t count)
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{
	struct ib_mad_recv_buf *recv_buf;
	int left, seg_payload, offset, max_seg_payload;

	/* We need enough room to copy the first (or only) MAD segment. */
	recv_buf = &packet->recv_wc->recv_buf;
	if ((packet->length <= sizeof (*recv_buf->mad) &&
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	     count < hdr_size(file) + packet->length) ||
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	    (packet->length > sizeof (*recv_buf->mad) &&
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	     count < hdr_size(file) + sizeof (*recv_buf->mad)))
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		return -EINVAL;

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	if (copy_to_user(buf, &packet->mad, hdr_size(file)))
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		return -EFAULT;

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	buf += hdr_size(file);
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	seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad));
	if (copy_to_user(buf, recv_buf->mad, seg_payload))
		return -EFAULT;

	if (seg_payload < packet->length) {
		/*
		 * Multipacket RMPP MAD message. Copy remainder of message.
		 * Note that last segment may have a shorter payload.
		 */
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		if (count < hdr_size(file) + packet->length) {
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			/*
			 * The buffer is too small, return the first RMPP segment,
			 * which includes the RMPP message length.
			 */
			return -ENOSPC;
		}
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		offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
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		max_seg_payload = sizeof (struct ib_mad) - offset;

		for (left = packet->length - seg_payload, buf += seg_payload;
		     left; left -= seg_payload, buf += seg_payload) {
			recv_buf = container_of(recv_buf->list.next,
						struct ib_mad_recv_buf, list);
			seg_payload = min(left, max_seg_payload);
			if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
					 seg_payload))
				return -EFAULT;
		}
	}
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	return hdr_size(file) + packet->length;
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}

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static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
			     struct ib_umad_packet *packet, size_t count)
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{
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	ssize_t size = hdr_size(file) + packet->length;
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	if (count < size)
		return -EINVAL;

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	if (copy_to_user(buf, &packet->mad, hdr_size(file)))
		return -EFAULT;

	buf += hdr_size(file);

	if (copy_to_user(buf, packet->mad.data, packet->length))
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		return -EFAULT;

	return size;
}

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static ssize_t ib_umad_read(struct file *filp, char __user *buf,
			    size_t count, loff_t *pos)
{
	struct ib_umad_file *file = filp->private_data;
	struct ib_umad_packet *packet;
	ssize_t ret;

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	if (count < hdr_size(file))
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		return -EINVAL;

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	mutex_lock(&file->mutex);
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	while (list_empty(&file->recv_list)) {
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		mutex_unlock(&file->mutex);
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		if (filp->f_flags & O_NONBLOCK)
			return -EAGAIN;

		if (wait_event_interruptible(file->recv_wait,
					     !list_empty(&file->recv_list)))
			return -ERESTARTSYS;

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		mutex_lock(&file->mutex);
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	}

	packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
	list_del(&packet->list);

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	mutex_unlock(&file->mutex);
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	if (packet->recv_wc)
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		ret = copy_recv_mad(file, buf, packet, count);
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	else
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		ret = copy_send_mad(file, buf, packet, count);
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	if (ret < 0) {
		/* Requeue packet */
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		mutex_lock(&file->mutex);
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		list_add(&packet->list, &file->recv_list);
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		mutex_unlock(&file->mutex);
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	} else {
		if (packet->recv_wc)
			ib_free_recv_mad(packet->recv_wc);
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		kfree(packet);
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	}
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	return ret;
}

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static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
{
	int left, seg;

	/* Copy class specific header */
	if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
	    copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
			   msg->hdr_len - IB_MGMT_RMPP_HDR))
		return -EFAULT;

	/* All headers are in place.  Copy data segments. */
	for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
	     seg++, left -= msg->seg_size, buf += msg->seg_size) {
		if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
				   min(left, msg->seg_size)))
			return -EFAULT;
	}
	return 0;
}

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static int same_destination(struct ib_user_mad_hdr *hdr1,
			    struct ib_user_mad_hdr *hdr2)
{
	if (!hdr1->grh_present && !hdr2->grh_present)
	   return (hdr1->lid == hdr2->lid);

	if (hdr1->grh_present && hdr2->grh_present)
	   return !memcmp(hdr1->gid, hdr2->gid, 16);

	return 0;
}

static int is_duplicate(struct ib_umad_file *file,
			struct ib_umad_packet *packet)
{
	struct ib_umad_packet *sent_packet;
	struct ib_mad_hdr *sent_hdr, *hdr;

	hdr = (struct ib_mad_hdr *) packet->mad.data;
	list_for_each_entry(sent_packet, &file->send_list, list) {
		sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;

		if ((hdr->tid != sent_hdr->tid) ||
		    (hdr->mgmt_class != sent_hdr->mgmt_class))
			continue;

		/*
		 * No need to be overly clever here.  If two new operations have
		 * the same TID, reject the second as a duplicate.  This is more
		 * restrictive than required by the spec.
		 */
		if (!ib_response_mad((struct ib_mad *) hdr)) {
			if (!ib_response_mad((struct ib_mad *) sent_hdr))
				return 1;
			continue;
		} else if (!ib_response_mad((struct ib_mad *) sent_hdr))
			continue;

		if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
			return 1;
	}

	return 0;
}

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static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
			     size_t count, loff_t *pos)
{
	struct ib_umad_file *file = filp->private_data;
	struct ib_umad_packet *packet;
	struct ib_mad_agent *agent;
	struct ib_ah_attr ah_attr;
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	struct ib_ah *ah;
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	struct ib_rmpp_mad *rmpp_mad;
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	__be64 *tid;
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	int ret, data_len, hdr_len, copy_offset, rmpp_active;
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	if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
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		return -EINVAL;

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	packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
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	if (!packet)
		return -ENOMEM;

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	if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
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		ret = -EFAULT;
		goto err;
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	}

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	if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
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		ret = -EINVAL;
		goto err;
	}

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	buf += hdr_size(file);

	if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
		ret = -EFAULT;
		goto err;
	}

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	mutex_lock(&file->mutex);
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	agent = __get_agent(file, packet->mad.hdr.id);
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	if (!agent) {
		ret = -EINVAL;
		goto err_up;
	}

	memset(&ah_attr, 0, sizeof ah_attr);
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	ah_attr.dlid          = be16_to_cpu(packet->mad.hdr.lid);
	ah_attr.sl            = packet->mad.hdr.sl;
	ah_attr.src_path_bits = packet->mad.hdr.path_bits;
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	ah_attr.port_num      = file->port->port_num;
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	if (packet->mad.hdr.grh_present) {
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		ah_attr.ah_flags = IB_AH_GRH;
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		memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
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		ah_attr.grh.sgid_index	   = packet->mad.hdr.gid_index;
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		ah_attr.grh.flow_label	   = be32_to_cpu(packet->mad.hdr.flow_label);
		ah_attr.grh.hop_limit	   = packet->mad.hdr.hop_limit;
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		ah_attr.grh.traffic_class  = packet->mad.hdr.traffic_class;
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	}

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	ah = ib_create_ah(agent->qp->pd, &ah_attr);
	if (IS_ERR(ah)) {
		ret = PTR_ERR(ah);
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		goto err_up;
	}

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	rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
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	hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
	if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) {
		copy_offset = IB_MGMT_MAD_HDR;
		rmpp_active = 0;
	} else {
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		copy_offset = IB_MGMT_RMPP_HDR;
		rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
			      IB_MGMT_RMPP_FLAG_ACTIVE;
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	}

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	data_len = count - hdr_size(file) - hdr_len;
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	packet->msg = ib_create_send_mad(agent,
					 be32_to_cpu(packet->mad.hdr.qpn),
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					 packet->mad.hdr.pkey_index, rmpp_active,
					 hdr_len, data_len, GFP_KERNEL);
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	if (IS_ERR(packet->msg)) {
		ret = PTR_ERR(packet->msg);
		goto err_ah;
	}
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	packet->msg->ah		= ah;
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	packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
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	packet->msg->retries	= packet->mad.hdr.retries;
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	packet->msg->context[0] = packet;
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533
	/* Copy MAD header.  Any RMPP header is already in place. */
S
Sean Hefty 已提交
534
	memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
535 536 537 538 539 540 541 542 543 544 545 546

	if (!rmpp_active) {
		if (copy_from_user(packet->msg->mad + copy_offset,
				   buf + copy_offset,
				   hdr_len + data_len - copy_offset)) {
			ret = -EFAULT;
			goto err_msg;
		}
	} else {
		ret = copy_rmpp_mad(packet->msg, buf);
		if (ret)
			goto err_msg;
547 548 549
	}

	/*
550 551 552
	 * Set the high-order part of the transaction ID to make MADs from
	 * different agents unique, and allow routing responses back to the
	 * original requestor.
553
	 */
554
	if (!ib_response_mad(packet->msg->mad)) {
555
		tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
556 557
		*tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
				   (be64_to_cpup(tid) & 0xffffffff));
558 559 560 561 562 563 564 565 566 567 568
		rmpp_mad->mad_hdr.tid = *tid;
	}

	spin_lock_irq(&file->send_lock);
	ret = is_duplicate(file, packet);
	if (!ret)
		list_add_tail(&packet->list, &file->send_list);
	spin_unlock_irq(&file->send_lock);
	if (ret) {
		ret = -EINVAL;
		goto err_msg;
L
Linus Torvalds 已提交
569 570
	}

571
	ret = ib_post_send_mad(packet->msg, NULL);
572
	if (ret)
573
		goto err_send;
574

575
	mutex_unlock(&file->mutex);
S
Sean Hefty 已提交
576
	return count;
577

578 579
err_send:
	dequeue_send(file, packet);
580 581 582
err_msg:
	ib_free_send_mad(packet->msg);
err_ah:
583
	ib_destroy_ah(ah);
L
Linus Torvalds 已提交
584
err_up:
585
	mutex_unlock(&file->mutex);
L
Linus Torvalds 已提交
586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605
err:
	kfree(packet);
	return ret;
}

static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
{
	struct ib_umad_file *file = filp->private_data;

	/* we will always be able to post a MAD send */
	unsigned int mask = POLLOUT | POLLWRNORM;

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

	if (!list_empty(&file->recv_list))
		mask |= POLLIN | POLLRDNORM;

	return mask;
}

606 607
static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
			     int compat_method_mask)
L
Linus Torvalds 已提交
608 609 610
{
	struct ib_user_mad_reg_req ureq;
	struct ib_mad_reg_req req;
611
	struct ib_mad_agent *agent = NULL;
L
Linus Torvalds 已提交
612 613 614
	int agent_id;
	int ret;

615 616
	mutex_lock(&file->port->file_mutex);
	mutex_lock(&file->mutex);
617 618

	if (!file->port->ib_dev) {
619 620
		dev_notice(file->port->dev,
			   "ib_umad_reg_agent: invalid device\n");
621 622 623
		ret = -EPIPE;
		goto out;
	}
L
Linus Torvalds 已提交
624

625
	if (copy_from_user(&ureq, arg, sizeof ureq)) {
L
Linus Torvalds 已提交
626 627 628 629 630
		ret = -EFAULT;
		goto out;
	}

	if (ureq.qpn != 0 && ureq.qpn != 1) {
631 632 633
		dev_notice(file->port->dev,
			   "ib_umad_reg_agent: invalid QPN %d specified\n",
			   ureq.qpn);
L
Linus Torvalds 已提交
634 635 636 637 638
		ret = -EINVAL;
		goto out;
	}

	for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
639
		if (!__get_agent(file, agent_id))
L
Linus Torvalds 已提交
640 641
			goto found;

642 643 644
	dev_notice(file->port->dev,
		   "ib_umad_reg_agent: Max Agents (%u) reached\n",
		   IB_UMAD_MAX_AGENTS);
L
Linus Torvalds 已提交
645 646 647 648
	ret = -ENOMEM;
	goto out;

found:
649
	if (ureq.mgmt_class) {
650
		memset(&req, 0, sizeof(req));
651 652
		req.mgmt_class         = ureq.mgmt_class;
		req.mgmt_class_version = ureq.mgmt_class_version;
653 654 655 656 657 658 659 660 661 662 663 664
		memcpy(req.oui, ureq.oui, sizeof req.oui);

		if (compat_method_mask) {
			u32 *umm = (u32 *) ureq.method_mask;
			int i;

			for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
				req.method_mask[i] =
					umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
		} else
			memcpy(req.method_mask, ureq.method_mask,
			       sizeof req.method_mask);
665
	}
L
Linus Torvalds 已提交
666 667 668

	agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
				      ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
669
				      ureq.mgmt_class ? &req : NULL,
670
				      ureq.rmpp_version,
671
				      send_handler, recv_handler, file, 0);
L
Linus Torvalds 已提交
672 673
	if (IS_ERR(agent)) {
		ret = PTR_ERR(agent);
674
		agent = NULL;
L
Linus Torvalds 已提交
675 676 677 678 679 680
		goto out;
	}

	if (put_user(agent_id,
		     (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
		ret = -EFAULT;
681
		goto out;
L
Linus Torvalds 已提交
682 683
	}

R
Roland Dreier 已提交
684 685 686
	if (!file->already_used) {
		file->already_used = 1;
		if (!file->use_pkey_index) {
687 688 689 690 691
			dev_warn(file->port->dev,
				"process %s did not enable P_Key index support.\n",
				current->comm);
			dev_warn(file->port->dev,
				"   Documentation/infiniband/user_mad.txt has info on the new ABI.\n");
R
Roland Dreier 已提交
692 693 694
		}
	}

695
	file->agent[agent_id] = agent;
L
Linus Torvalds 已提交
696
	ret = 0;
697

L
Linus Torvalds 已提交
698
out:
699 700 701 702 703 704 705
	mutex_unlock(&file->mutex);

	if (ret && agent)
		ib_unregister_mad_agent(agent);

	mutex_unlock(&file->port->file_mutex);

L
Linus Torvalds 已提交
706 707 708
	return ret;
}

709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821
static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
{
	struct ib_user_mad_reg_req2 ureq;
	struct ib_mad_reg_req req;
	struct ib_mad_agent *agent = NULL;
	int agent_id;
	int ret;

	mutex_lock(&file->port->file_mutex);
	mutex_lock(&file->mutex);

	if (!file->port->ib_dev) {
		dev_notice(file->port->dev,
			   "ib_umad_reg_agent2: invalid device\n");
		ret = -EPIPE;
		goto out;
	}

	if (copy_from_user(&ureq, arg, sizeof(ureq))) {
		ret = -EFAULT;
		goto out;
	}

	if (ureq.qpn != 0 && ureq.qpn != 1) {
		dev_notice(file->port->dev,
			   "ib_umad_reg_agent2: invalid QPN %d specified\n",
			   ureq.qpn);
		ret = -EINVAL;
		goto out;
	}

	if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
		dev_notice(file->port->dev,
			   "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n",
			   ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
		ret = -EINVAL;

		if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
				(u32 __user *) (arg + offsetof(struct
				ib_user_mad_reg_req2, flags))))
			ret = -EFAULT;

		goto out;
	}

	for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
		if (!__get_agent(file, agent_id))
			goto found;

	dev_notice(file->port->dev,
		   "ib_umad_reg_agent2: Max Agents (%u) reached\n",
		   IB_UMAD_MAX_AGENTS);
	ret = -ENOMEM;
	goto out;

found:
	if (ureq.mgmt_class) {
		memset(&req, 0, sizeof(req));
		req.mgmt_class         = ureq.mgmt_class;
		req.mgmt_class_version = ureq.mgmt_class_version;
		if (ureq.oui & 0xff000000) {
			dev_notice(file->port->dev,
				   "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n",
				   ureq.oui);
			ret = -EINVAL;
			goto out;
		}
		req.oui[2] =  ureq.oui & 0x0000ff;
		req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
		req.oui[0] = (ureq.oui & 0xff0000) >> 16;
		memcpy(req.method_mask, ureq.method_mask,
			sizeof(req.method_mask));
	}

	agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
				      ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
				      ureq.mgmt_class ? &req : NULL,
				      ureq.rmpp_version,
				      send_handler, recv_handler, file,
				      ureq.flags);
	if (IS_ERR(agent)) {
		ret = PTR_ERR(agent);
		agent = NULL;
		goto out;
	}

	if (put_user(agent_id,
		     (u32 __user *)(arg +
				offsetof(struct ib_user_mad_reg_req2, id)))) {
		ret = -EFAULT;
		goto out;
	}

	if (!file->already_used) {
		file->already_used = 1;
		file->use_pkey_index = 1;
	}

	file->agent[agent_id] = agent;
	ret = 0;

out:
	mutex_unlock(&file->mutex);

	if (ret && agent)
		ib_unregister_mad_agent(agent);

	mutex_unlock(&file->port->file_mutex);

	return ret;
}


822
static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
L
Linus Torvalds 已提交
823
{
824
	struct ib_mad_agent *agent = NULL;
L
Linus Torvalds 已提交
825 826 827
	u32 id;
	int ret = 0;

828
	if (get_user(id, arg))
829
		return -EFAULT;
L
Linus Torvalds 已提交
830

831 832
	mutex_lock(&file->port->file_mutex);
	mutex_lock(&file->mutex);
L
Linus Torvalds 已提交
833

834
	if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
L
Linus Torvalds 已提交
835 836 837 838
		ret = -EINVAL;
		goto out;
	}

839
	agent = file->agent[id];
L
Linus Torvalds 已提交
840 841 842
	file->agent[id] = NULL;

out:
843
	mutex_unlock(&file->mutex);
844

845
	if (agent)
846 847
		ib_unregister_mad_agent(agent);

848 849
	mutex_unlock(&file->port->file_mutex);

L
Linus Torvalds 已提交
850 851 852
	return ret;
}

R
Roland Dreier 已提交
853 854 855 856
static long ib_umad_enable_pkey(struct ib_umad_file *file)
{
	int ret = 0;

857
	mutex_lock(&file->mutex);
R
Roland Dreier 已提交
858 859 860 861
	if (file->already_used)
		ret = -EINVAL;
	else
		file->use_pkey_index = 1;
862
	mutex_unlock(&file->mutex);
R
Roland Dreier 已提交
863 864 865 866

	return ret;
}

867 868
static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
			  unsigned long arg)
L
Linus Torvalds 已提交
869 870 871
{
	switch (cmd) {
	case IB_USER_MAD_REGISTER_AGENT:
872
		return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
L
Linus Torvalds 已提交
873
	case IB_USER_MAD_UNREGISTER_AGENT:
874
		return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
R
Roland Dreier 已提交
875 876
	case IB_USER_MAD_ENABLE_PKEY:
		return ib_umad_enable_pkey(filp->private_data);
877 878
	case IB_USER_MAD_REGISTER_AGENT2:
		return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
L
Linus Torvalds 已提交
879 880 881 882 883
	default:
		return -ENOIOCTLCMD;
	}
}

884 885 886 887 888 889 890 891 892 893 894
#ifdef CONFIG_COMPAT
static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
				 unsigned long arg)
{
	switch (cmd) {
	case IB_USER_MAD_REGISTER_AGENT:
		return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
	case IB_USER_MAD_UNREGISTER_AGENT:
		return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
	case IB_USER_MAD_ENABLE_PKEY:
		return ib_umad_enable_pkey(filp->private_data);
895 896
	case IB_USER_MAD_REGISTER_AGENT2:
		return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
897 898 899 900 901 902
	default:
		return -ENOIOCTLCMD;
	}
}
#endif

903 904 905
/*
 * ib_umad_open() does not need the BKL:
 *
A
Alexander Chiang 已提交
906
 *  - the ib_umad_port structures are properly reference counted, and
907 908 909 910 911
 *    everything else is purely local to the file being created, so
 *    races against other open calls are not a problem;
 *  - the ioctl method does not affect any global state outside of the
 *    file structure being operated on;
 */
L
Linus Torvalds 已提交
912 913
static int ib_umad_open(struct inode *inode, struct file *filp)
{
914
	struct ib_umad_port *port;
L
Linus Torvalds 已提交
915
	struct ib_umad_file *file;
B
Bart Van Assche 已提交
916
	int ret = -ENXIO;
L
Linus Torvalds 已提交
917

A
Alexander Chiang 已提交
918
	port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
919

920
	mutex_lock(&port->file_mutex);
921

B
Bart Van Assche 已提交
922
	if (!port->ib_dev)
923 924
		goto out;

B
Bart Van Assche 已提交
925
	ret = -ENOMEM;
S
Sean Hefty 已提交
926
	file = kzalloc(sizeof *file, GFP_KERNEL);
B
Bart Van Assche 已提交
927
	if (!file)
928
		goto out;
L
Linus Torvalds 已提交
929

930
	mutex_init(&file->mutex);
931
	spin_lock_init(&file->send_lock);
L
Linus Torvalds 已提交
932
	INIT_LIST_HEAD(&file->recv_list);
933
	INIT_LIST_HEAD(&file->send_list);
L
Linus Torvalds 已提交
934 935 936 937 938
	init_waitqueue_head(&file->recv_wait);

	file->port = port;
	filp->private_data = file;

939 940
	list_add_tail(&file->port_list, &port->file_list);

941
	ret = nonseekable_open(inode, filp);
B
Bart Van Assche 已提交
942 943 944 945 946 947
	if (ret) {
		list_del(&file->port_list);
		kfree(file);
		goto out;
	}

948
	kobject_get(&port->umad_dev->kobj);
949

950
out:
951
	mutex_unlock(&port->file_mutex);
952
	return ret;
L
Linus Torvalds 已提交
953 954 955 956 957
}

static int ib_umad_close(struct inode *inode, struct file *filp)
{
	struct ib_umad_file *file = filp->private_data;
958
	struct ib_umad_device *dev = file->port->umad_dev;
959
	struct ib_umad_packet *packet, *tmp;
960
	int already_dead;
L
Linus Torvalds 已提交
961 962
	int i;

963 964
	mutex_lock(&file->port->file_mutex);
	mutex_lock(&file->mutex);
965 966 967

	already_dead = file->agents_dead;
	file->agents_dead = 1;
L
Linus Torvalds 已提交
968

969 970 971
	list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
		if (packet->recv_wc)
			ib_free_recv_mad(packet->recv_wc);
972
		kfree(packet);
973
	}
974

975 976
	list_del(&file->port_list);

977
	mutex_unlock(&file->mutex);
978 979 980 981 982

	if (!already_dead)
		for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
			if (file->agent[i])
				ib_unregister_mad_agent(file->agent[i]);
L
Linus Torvalds 已提交
983

984
	mutex_unlock(&file->port->file_mutex);
985 986

	kfree(file);
987
	kobject_put(&dev->kobj);
988

L
Linus Torvalds 已提交
989 990 991
	return 0;
}

992
static const struct file_operations umad_fops = {
A
Alexander Chiang 已提交
993 994 995 996
	.owner		= THIS_MODULE,
	.read		= ib_umad_read,
	.write		= ib_umad_write,
	.poll		= ib_umad_poll,
L
Linus Torvalds 已提交
997
	.unlocked_ioctl = ib_umad_ioctl,
998
#ifdef CONFIG_COMPAT
A
Alexander Chiang 已提交
999
	.compat_ioctl	= ib_umad_compat_ioctl,
1000
#endif
A
Alexander Chiang 已提交
1001
	.open		= ib_umad_open,
1002 1003
	.release	= ib_umad_close,
	.llseek		= no_llseek,
L
Linus Torvalds 已提交
1004 1005 1006 1007
};

static int ib_umad_sm_open(struct inode *inode, struct file *filp)
{
1008
	struct ib_umad_port *port;
L
Linus Torvalds 已提交
1009 1010 1011 1012 1013
	struct ib_port_modify props = {
		.set_port_cap_mask = IB_PORT_SM
	};
	int ret;

A
Alexander Chiang 已提交
1014
	port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1015

L
Linus Torvalds 已提交
1016
	if (filp->f_flags & O_NONBLOCK) {
1017 1018 1019 1020
		if (down_trylock(&port->sm_sem)) {
			ret = -EAGAIN;
			goto fail;
		}
L
Linus Torvalds 已提交
1021
	} else {
1022 1023 1024 1025
		if (down_interruptible(&port->sm_sem)) {
			ret = -ERESTARTSYS;
			goto fail;
		}
L
Linus Torvalds 已提交
1026 1027 1028
	}

	ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
B
Bart Van Assche 已提交
1029 1030
	if (ret)
		goto err_up_sem;
L
Linus Torvalds 已提交
1031 1032 1033

	filp->private_data = port;

B
Bart Van Assche 已提交
1034 1035 1036 1037
	ret = nonseekable_open(inode, filp);
	if (ret)
		goto err_clr_sm_cap;

1038
	kobject_get(&port->umad_dev->kobj);
B
Bart Van Assche 已提交
1039 1040 1041 1042 1043 1044 1045 1046 1047

	return 0;

err_clr_sm_cap:
	swap(props.set_port_cap_mask, props.clr_port_cap_mask);
	ib_modify_port(port->ib_dev, port->port_num, 0, &props);

err_up_sem:
	up(&port->sm_sem);
1048 1049 1050

fail:
	return ret;
L
Linus Torvalds 已提交
1051 1052 1053 1054 1055 1056 1057 1058
}

static int ib_umad_sm_close(struct inode *inode, struct file *filp)
{
	struct ib_umad_port *port = filp->private_data;
	struct ib_port_modify props = {
		.clr_port_cap_mask = IB_PORT_SM
	};
1059 1060
	int ret = 0;

1061
	mutex_lock(&port->file_mutex);
1062 1063
	if (port->ib_dev)
		ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1064
	mutex_unlock(&port->file_mutex);
L
Linus Torvalds 已提交
1065 1066 1067

	up(&port->sm_sem);

1068
	kobject_put(&port->umad_dev->kobj);
1069

L
Linus Torvalds 已提交
1070 1071 1072
	return ret;
}

1073
static const struct file_operations umad_sm_fops = {
A
Alexander Chiang 已提交
1074 1075
	.owner	 = THIS_MODULE,
	.open	 = ib_umad_sm_open,
1076 1077
	.release = ib_umad_sm_close,
	.llseek	 = no_llseek,
L
Linus Torvalds 已提交
1078 1079 1080 1081 1082 1083 1084 1085
};

static struct ib_client umad_client = {
	.name   = "umad",
	.add    = ib_umad_add_one,
	.remove = ib_umad_remove_one
};

1086 1087
static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
			  char *buf)
L
Linus Torvalds 已提交
1088
{
1089
	struct ib_umad_port *port = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
1090

1091 1092 1093
	if (!port)
		return -ENODEV;

L
Linus Torvalds 已提交
1094 1095
	return sprintf(buf, "%s\n", port->ib_dev->name);
}
1096
static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
L
Linus Torvalds 已提交
1097

1098 1099
static ssize_t show_port(struct device *dev, struct device_attribute *attr,
			 char *buf)
L
Linus Torvalds 已提交
1100
{
1101
	struct ib_umad_port *port = dev_get_drvdata(dev);
L
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1102

1103 1104 1105
	if (!port)
		return -ENODEV;

L
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1106 1107
	return sprintf(buf, "%d\n", port->port_num);
}
1108
static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
L
Linus Torvalds 已提交
1109

1110 1111
static CLASS_ATTR_STRING(abi_version, S_IRUGO,
			 __stringify(IB_USER_MAD_ABI_VERSION));
L
Linus Torvalds 已提交
1112

1113 1114
static dev_t overflow_maj;
static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS);
1115
static int find_overflow_devnum(struct ib_device *device)
1116 1117 1118 1119 1120 1121 1122
{
	int ret;

	if (!overflow_maj) {
		ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2,
					  "infiniband_mad");
		if (ret) {
1123 1124
			dev_err(&device->dev,
				"couldn't register dynamic device number\n");
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135
			return ret;
		}
	}

	ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS);
	if (ret >= IB_UMAD_MAX_PORTS)
		return -1;

	return ret;
}

L
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1136
static int ib_umad_init_port(struct ib_device *device, int port_num,
1137
			     struct ib_umad_device *umad_dev,
L
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1138 1139
			     struct ib_umad_port *port)
{
1140
	int devnum;
1141
	dev_t base;
1142

1143
	spin_lock(&port_lock);
1144 1145
	devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
	if (devnum >= IB_UMAD_MAX_PORTS) {
1146
		spin_unlock(&port_lock);
1147
		devnum = find_overflow_devnum(device);
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
		if (devnum < 0)
			return -1;

		spin_lock(&port_lock);
		port->dev_num = devnum + IB_UMAD_MAX_PORTS;
		base = devnum + overflow_maj;
		set_bit(devnum, overflow_map);
	} else {
		port->dev_num = devnum;
		base = devnum + base_dev;
		set_bit(devnum, dev_map);
L
Linus Torvalds 已提交
1159
	}
1160
	spin_unlock(&port_lock);
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1161 1162 1163

	port->ib_dev   = device;
	port->port_num = port_num;
1164
	sema_init(&port->sm_sem, 1);
1165
	mutex_init(&port->file_mutex);
1166
	INIT_LIST_HEAD(&port->file_list);
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1167

1168 1169
	cdev_init(&port->cdev, &umad_fops);
	port->cdev.owner = THIS_MODULE;
1170
	port->cdev.kobj.parent = &umad_dev->kobj;
1171
	kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
1172
	if (cdev_add(&port->cdev, base, 1))
L
Linus Torvalds 已提交
1173 1174
		goto err_cdev;

1175
	port->dev = device_create(umad_class, device->dma_device,
1176
				  port->cdev.dev, port,
1177
				  "umad%d", port->dev_num);
1178
	if (IS_ERR(port->dev))
1179
		goto err_cdev;
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Linus Torvalds 已提交
1180

1181 1182 1183 1184 1185
	if (device_create_file(port->dev, &dev_attr_ibdev))
		goto err_dev;
	if (device_create_file(port->dev, &dev_attr_port))
		goto err_dev;

1186
	base += IB_UMAD_MAX_PORTS;
1187 1188
	cdev_init(&port->sm_cdev, &umad_sm_fops);
	port->sm_cdev.owner = THIS_MODULE;
1189
	port->sm_cdev.kobj.parent = &umad_dev->kobj;
1190
	kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
1191
	if (cdev_add(&port->sm_cdev, base, 1))
1192
		goto err_sm_cdev;
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1193

1194
	port->sm_dev = device_create(umad_class, device->dma_device,
1195
				     port->sm_cdev.dev, port,
1196
				     "issm%d", port->dev_num);
1197
	if (IS_ERR(port->sm_dev))
L
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1198 1199
		goto err_sm_cdev;

1200 1201 1202 1203
	if (device_create_file(port->sm_dev, &dev_attr_ibdev))
		goto err_sm_dev;
	if (device_create_file(port->sm_dev, &dev_attr_port))
		goto err_sm_dev;
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1204 1205 1206

	return 0;

1207
err_sm_dev:
1208
	device_destroy(umad_class, port->sm_cdev.dev);
L
Linus Torvalds 已提交
1209 1210

err_sm_cdev:
1211
	cdev_del(&port->sm_cdev);
L
Linus Torvalds 已提交
1212

1213
err_dev:
1214
	device_destroy(umad_class, port->cdev.dev);
L
Linus Torvalds 已提交
1215 1216

err_cdev:
1217
	cdev_del(&port->cdev);
1218 1219 1220 1221
	if (port->dev_num < IB_UMAD_MAX_PORTS)
		clear_bit(devnum, dev_map);
	else
		clear_bit(devnum, overflow_map);
L
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1222 1223 1224 1225

	return -1;
}

1226 1227
static void ib_umad_kill_port(struct ib_umad_port *port)
{
1228 1229 1230
	struct ib_umad_file *file;
	int id;

1231 1232
	dev_set_drvdata(port->dev,    NULL);
	dev_set_drvdata(port->sm_dev, NULL);
1233

1234 1235
	device_destroy(umad_class, port->cdev.dev);
	device_destroy(umad_class, port->sm_cdev.dev);
1236

1237 1238
	cdev_del(&port->cdev);
	cdev_del(&port->sm_cdev);
1239

1240
	mutex_lock(&port->file_mutex);
1241 1242 1243

	port->ib_dev = NULL;

1244 1245
	list_for_each_entry(file, &port->file_list, port_list) {
		mutex_lock(&file->mutex);
1246
		file->agents_dead = 1;
1247
		mutex_unlock(&file->mutex);
1248 1249 1250 1251 1252

		for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
			if (file->agent[id])
				ib_unregister_mad_agent(file->agent[id]);
	}
1253

1254
	mutex_unlock(&port->file_mutex);
1255

1256 1257 1258 1259
	if (port->dev_num < IB_UMAD_MAX_PORTS)
		clear_bit(port->dev_num, dev_map);
	else
		clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map);
1260 1261
}

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1262 1263 1264 1265 1266
static void ib_umad_add_one(struct ib_device *device)
{
	struct ib_umad_device *umad_dev;
	int s, e, i;

T
Tom Tucker 已提交
1267 1268 1269 1270
	if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
		return;

	if (device->node_type == RDMA_NODE_IB_SWITCH)
L
Linus Torvalds 已提交
1271 1272 1273 1274 1275 1276
		s = e = 0;
	else {
		s = 1;
		e = device->phys_port_cnt;
	}

S
Sean Hefty 已提交
1277
	umad_dev = kzalloc(sizeof *umad_dev +
L
Linus Torvalds 已提交
1278 1279 1280 1281 1282
			   (e - s + 1) * sizeof (struct ib_umad_port),
			   GFP_KERNEL);
	if (!umad_dev)
		return;

1283
	kobject_init(&umad_dev->kobj, &ib_umad_dev_ktype);
L
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1284 1285 1286 1287 1288 1289 1290

	umad_dev->start_port = s;
	umad_dev->end_port   = e;

	for (i = s; i <= e; ++i) {
		umad_dev->port[i - s].umad_dev = umad_dev;

1291 1292
		if (ib_umad_init_port(device, i, umad_dev,
				      &umad_dev->port[i - s]))
L
Linus Torvalds 已提交
1293 1294 1295 1296 1297 1298 1299 1300
			goto err;
	}

	ib_set_client_data(device, &umad_client, umad_dev);

	return;

err:
1301
	while (--i >= s)
M
Michael S. Tsirkin 已提交
1302
		ib_umad_kill_port(&umad_dev->port[i - s]);
L
Linus Torvalds 已提交
1303

1304
	kobject_put(&umad_dev->kobj);
L
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1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
}

static void ib_umad_remove_one(struct ib_device *device)
{
	struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
	int i;

	if (!umad_dev)
		return;

1315 1316
	for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i)
		ib_umad_kill_port(&umad_dev->port[i]);
L
Linus Torvalds 已提交
1317

1318
	kobject_put(&umad_dev->kobj);
L
Linus Torvalds 已提交
1319 1320
}

1321
static char *umad_devnode(struct device *dev, umode_t *mode)
1322 1323 1324 1325
{
	return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
}

L
Linus Torvalds 已提交
1326 1327 1328 1329 1330 1331 1332
static int __init ib_umad_init(void)
{
	int ret;

	ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
				     "infiniband_mad");
	if (ret) {
1333
		pr_err("couldn't register device number\n");
L
Linus Torvalds 已提交
1334 1335 1336
		goto out;
	}

1337 1338 1339
	umad_class = class_create(THIS_MODULE, "infiniband_mad");
	if (IS_ERR(umad_class)) {
		ret = PTR_ERR(umad_class);
1340
		pr_err("couldn't create class infiniband_mad\n");
L
Linus Torvalds 已提交
1341 1342 1343
		goto out_chrdev;
	}

1344 1345
	umad_class->devnode = umad_devnode;

1346
	ret = class_create_file(umad_class, &class_attr_abi_version.attr);
L
Linus Torvalds 已提交
1347
	if (ret) {
1348
		pr_err("couldn't create abi_version attribute\n");
L
Linus Torvalds 已提交
1349 1350 1351 1352 1353
		goto out_class;
	}

	ret = ib_register_client(&umad_client);
	if (ret) {
1354
		pr_err("couldn't register ib_umad client\n");
L
Linus Torvalds 已提交
1355 1356 1357 1358 1359 1360
		goto out_class;
	}

	return 0;

out_class:
1361
	class_destroy(umad_class);
L
Linus Torvalds 已提交
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372

out_chrdev:
	unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);

out:
	return ret;
}

static void __exit ib_umad_cleanup(void)
{
	ib_unregister_client(&umad_client);
1373
	class_destroy(umad_class);
L
Linus Torvalds 已提交
1374
	unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1375 1376
	if (overflow_maj)
		unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2);
L
Linus Torvalds 已提交
1377 1378 1379 1380
}

module_init(ib_umad_init);
module_exit(ib_umad_cleanup);