user_mad.c

h内核

err_mr:
	ib_dereg_mr(file->mr[agent_id]);

err:
	file->agent[agent_id] = NULL;
	ib_unregister_mad_agent(agent);

out:
	up_write(&file->agent_mutex);
	return ret;
}

static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg)
{
	u32 id;
	int ret = 0;

	down_write(&file->agent_mutex);

	if (get_user(id, (u32 __user *) arg)) {
		ret = -EFAULT;
		goto out;
	}

	if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !file->agent[id]) {
		ret = -EINVAL;
		goto out;
	}

	ib_dereg_mr(file->mr[id]);
	ib_unregister_mad_agent(file->agent[id]);
	file->agent[id] = NULL;

out:
	up_write(&file->agent_mutex);
	return ret;
}

static long ib_umad_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, arg);
	case IB_USER_MAD_UNREGISTER_AGENT:
		return ib_umad_unreg_agent(filp->private_data, arg);
	default:
		return -ENOIOCTLCMD;
	}
}

static int ib_umad_open(struct inode *inode, struct file *filp)
{
	struct ib_umad_port *port =
		container_of(inode->i_cdev, struct ib_umad_port, dev);
	struct ib_umad_file *file;

	file = kmalloc(sizeof *file, GFP_KERNEL);
	if (!file)
		return -ENOMEM;

	memset(file, 0, sizeof *file);

	spin_lock_init(&file->recv_lock);
	init_rwsem(&file->agent_mutex);
	INIT_LIST_HEAD(&file->recv_list);
	init_waitqueue_head(&file->recv_wait);

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

	return 0;
}

static int ib_umad_close(struct inode *inode, struct file *filp)
{
	struct ib_umad_file *file = filp->private_data;
	int i;

	for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
		if (file->agent[i]) {
			ib_dereg_mr(file->mr[i]);
			ib_unregister_mad_agent(file->agent[i]);
		}

	kfree(file);

	return 0;
}

static struct file_operations umad_fops = {
	.owner 	        = THIS_MODULE,
	.read 	        = ib_umad_read,
	.write 	        = ib_umad_write,
	.poll 	        = ib_umad_poll,
	.unlocked_ioctl = ib_umad_ioctl,
	.compat_ioctl   = ib_umad_ioctl,
	.open 	        = ib_umad_open,
	.release        = ib_umad_close
};

static int ib_umad_sm_open(struct inode *inode, struct file *filp)
{
	struct ib_umad_port *port =
		container_of(inode->i_cdev, struct ib_umad_port, sm_dev);
	struct ib_port_modify props = {
		.set_port_cap_mask = IB_PORT_SM
	};
	int ret;

	if (filp->f_flags & O_NONBLOCK) {
		if (down_trylock(&port->sm_sem))
			return -EAGAIN;
	} else {
		if (down_interruptible(&port->sm_sem))
			return -ERESTARTSYS;
	}

	ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
	if (ret) {
		up(&port->sm_sem);
		return ret;
	}

	filp->private_data = port;

	return 0;
}

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
	};
	int ret;

	ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
	up(&port->sm_sem);

	return ret;
}

static struct file_operations umad_sm_fops = {
	.owner 	 = THIS_MODULE,
	.open 	 = ib_umad_sm_open,
	.release = ib_umad_sm_close
};

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

static ssize_t show_dev(struct class_device *class_dev, char *buf)
{
	struct ib_umad_port *port = class_get_devdata(class_dev);

	if (class_dev == &port->class_dev)
		return print_dev_t(buf, port->dev.dev);
	else
		return print_dev_t(buf, port->sm_dev.dev);
}
static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL);

static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
{
	struct ib_umad_port *port = class_get_devdata(class_dev);

	return sprintf(buf, "%s\n", port->ib_dev->name);
}
static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);

static ssize_t show_port(struct class_device *class_dev, char *buf)
{
	struct ib_umad_port *port = class_get_devdata(class_dev);

	return sprintf(buf, "%d\n", port->port_num);
}
static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);

static void ib_umad_release_dev(struct kref *ref)
{
	struct ib_umad_device *dev =
		container_of(ref, struct ib_umad_device, ref);

	kfree(dev);
}

static void ib_umad_release_port(struct class_device *class_dev)
{
	struct ib_umad_port *port = class_get_devdata(class_dev);

	if (class_dev == &port->class_dev) {
		cdev_del(&port->dev);
		clear_bit(port->devnum, dev_map);
	} else {
		cdev_del(&port->sm_dev);
		clear_bit(port->sm_devnum, dev_map);
	}

	kref_put(&port->umad_dev->ref, ib_umad_release_dev);
}

static struct class umad_class = {
	.name    = "infiniband_mad",
	.release = ib_umad_release_port
};

static ssize_t show_abi_version(struct class *class, char *buf)
{
	return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
}
static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);

static int ib_umad_init_port(struct ib_device *device, int port_num,
			     struct ib_umad_port *port)
{
	spin_lock(&map_lock);
	port->devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
	if (port->devnum >= IB_UMAD_MAX_PORTS) {
		spin_unlock(&map_lock);
		return -1;
	}
	port->sm_devnum = find_next_zero_bit(dev_map, IB_UMAD_MAX_PORTS * 2, IB_UMAD_MAX_PORTS);
	if (port->sm_devnum >= IB_UMAD_MAX_PORTS * 2) {
		spin_unlock(&map_lock);
		return -1;
	}
	set_bit(port->devnum, dev_map);
	set_bit(port->sm_devnum, dev_map);
	spin_unlock(&map_lock);

	port->ib_dev   = device;
	port->port_num = port_num;
	init_MUTEX(&port->sm_sem);

	cdev_init(&port->dev, &umad_fops);
	port->dev.owner = THIS_MODULE;
	kobject_set_name(&port->dev.kobj, "umad%d", port->devnum);
	if (cdev_add(&port->dev, base_dev + port->devnum, 1))
		return -1;

	port->class_dev.class = &umad_class;
	port->class_dev.dev   = device->dma_device;

	snprintf(port->class_dev.class_id, BUS_ID_SIZE, "umad%d", port->devnum);

	if (class_device_register(&port->class_dev))
		goto err_cdev;

	class_set_devdata(&port->class_dev, port);
	kref_get(&port->umad_dev->ref);

	if (class_device_create_file(&port->class_dev, &class_device_attr_dev))
		goto err_class;
	if (class_device_create_file(&port->class_dev, &class_device_attr_ibdev))
		goto err_class;
	if (class_device_create_file(&port->class_dev, &class_device_attr_port))
		goto err_class;

	cdev_init(&port->sm_dev, &umad_sm_fops);
	port->sm_dev.owner = THIS_MODULE;
	kobject_set_name(&port->dev.kobj, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS);
	if (cdev_add(&port->sm_dev, base_dev + port->sm_devnum, 1))
		return -1;

	port->sm_class_dev.class = &umad_class;
	port->sm_class_dev.dev   = device->dma_device;

	snprintf(port->sm_class_dev.class_id, BUS_ID_SIZE, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS);

	if (class_device_register(&port->sm_class_dev))
		goto err_sm_cdev;

	class_set_devdata(&port->sm_class_dev, port);
	kref_get(&port->umad_dev->ref);

	if (class_device_create_file(&port->sm_class_dev, &class_device_attr_dev))
		goto err_sm_class;
	if (class_device_create_file(&port->sm_class_dev, &class_device_attr_ibdev))
		goto err_sm_class;
	if (class_device_create_file(&port->sm_class_dev, &class_device_attr_port))
		goto err_sm_class;

	return 0;

err_sm_class:
	class_device_unregister(&port->sm_class_dev);

err_sm_cdev:
	cdev_del(&port->sm_dev);

err_class:
	class_device_unregister(&port->class_dev);

err_cdev:
	cdev_del(&port->dev);
	clear_bit(port->devnum, dev_map);

	return -1;
}

static void ib_umad_add_one(struct ib_device *device)
{
	struct ib_umad_device *umad_dev;
	int s, e, i;

	if (device->node_type == IB_NODE_SWITCH)
		s = e = 0;
	else {
		s = 1;
		e = device->phys_port_cnt;
	}

	umad_dev = kmalloc(sizeof *umad_dev +
			   (e - s + 1) * sizeof (struct ib_umad_port),
			   GFP_KERNEL);
	if (!umad_dev)
		return;

	memset(umad_dev, 0, sizeof *umad_dev +
	       (e - s + 1) * sizeof (struct ib_umad_port));

	kref_init(&umad_dev->ref);

	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;

		if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
			goto err;
	}

	ib_set_client_data(device, &umad_client, umad_dev);

	return;

err:
	while (--i >= s) {
		class_device_unregister(&umad_dev->port[i - s].class_dev);
		class_device_unregister(&umad_dev->port[i - s].sm_class_dev);
	}

	kref_put(&umad_dev->ref, ib_umad_release_dev);
}

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;

	for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) {
		class_device_unregister(&umad_dev->port[i].class_dev);
		class_device_unregister(&umad_dev->port[i].sm_class_dev);
	}

	kref_put(&umad_dev->ref, ib_umad_release_dev);
}

static int __init ib_umad_init(void)
{
	int ret;

	spin_lock_init(&map_lock);

	ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
				     "infiniband_mad");
	if (ret) {
		printk(KERN_ERR "user_mad: couldn't register device number\n");
		goto out;
	}

	ret = class_register(&umad_class);
	if (ret) {
		printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
		goto out_chrdev;
	}

	ret = class_create_file(&umad_class, &class_attr_abi_version);
	if (ret) {
		printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
		goto out_class;
	}

	ret = ib_register_client(&umad_client);
	if (ret) {
		printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
		goto out_class;
	}

	return 0;

out_class:
	class_unregister(&umad_class);

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);
	class_unregister(&umad_class);
	unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
}

module_init(ib_umad_init);
module_exit(ib_umad_cleanup);