9  * General Public License (GPL) Version 2, available from the file
70  * device special file is opened, we take a reference on the
145 static int hdr_size(struct ib_umad_file *file)  in hdr_size()  argument
147 	return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :  in hdr_size()
151 /* caller must hold file->mutex */
152 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)  in __get_agent()  argument
154 	return file->agents_dead ? NULL : file->agent[id];  in __get_agent()
157 static int queue_packet(struct ib_umad_file *file,  in queue_packet()  argument
163 	mutex_lock(&file->mutex);  in queue_packet()
168 		if (agent == __get_agent(file, packet->mad.hdr.id)) {  in queue_packet()
169 			list_add_tail(&packet->list, &file->recv_list);  in queue_packet()
170 			wake_up_interruptible(&file->recv_wait);  in queue_packet()
175 	mutex_unlock(&file->mutex);  in queue_packet()
180 static void dequeue_send(struct ib_umad_file *file,  in dequeue_send()  argument
183 	spin_lock_irq(&file->send_lock);  in dequeue_send()
185 	spin_unlock_irq(&file->send_lock);  in dequeue_send()
191 	struct ib_umad_file *file = agent->context;  in send_handler()  local
194 	dequeue_send(file, packet);  in send_handler()
201 		if (!queue_packet(file, agent, packet))  in send_handler()
210 	struct ib_umad_file *file = agent->context;  in recv_handler()  local
224 	packet->mad.hdr.length	   = hdr_size(file) + mad_recv_wc->mad_len;  in recv_handler()
245 	if (queue_packet(file, agent, packet))  in recv_handler()
255 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,  in copy_recv_mad()  argument
264 	     count < hdr_size(file) + packet->length) ||  in copy_recv_mad()
266 	     count < hdr_size(file) + sizeof (*recv_buf->mad)))  in copy_recv_mad()
269 	if (copy_to_user(buf, &packet->mad, hdr_size(file)))  in copy_recv_mad()
272 	buf += hdr_size(file);  in copy_recv_mad()
282 		if (count < hdr_size(file) + packet->length) {  in copy_recv_mad()
302 	return hdr_size(file) + packet->length;  in copy_recv_mad()
305 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,  in copy_send_mad()  argument
308 	ssize_t size = hdr_size(file) + packet->length;  in copy_send_mad()
313 	if (copy_to_user(buf, &packet->mad, hdr_size(file)))  in copy_send_mad()
316 	buf += hdr_size(file);  in copy_send_mad()
324 static ssize_t ib_umad_read(struct file *filp, char __user *buf,  in ib_umad_read()
327 	struct ib_umad_file *file = filp->private_data;  in ib_umad_read()  local
331 	if (count < hdr_size(file))  in ib_umad_read()
334 	mutex_lock(&file->mutex);  in ib_umad_read()
336 	while (list_empty(&file->recv_list)) {  in ib_umad_read()
337 		mutex_unlock(&file->mutex);  in ib_umad_read()
342 		if (wait_event_interruptible(file->recv_wait,  in ib_umad_read()
343 					     !list_empty(&file->recv_list)))  in ib_umad_read()
346 		mutex_lock(&file->mutex);  in ib_umad_read()
349 	packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);  in ib_umad_read()
352 	mutex_unlock(&file->mutex);  in ib_umad_read()
355 		ret = copy_recv_mad(file, buf, packet, count);  in ib_umad_read()
357 		ret = copy_send_mad(file, buf, packet, count);  in ib_umad_read()
361 		mutex_lock(&file->mutex);  in ib_umad_read()
362 		list_add(&packet->list, &file->recv_list);  in ib_umad_read()
363 		mutex_unlock(&file->mutex);  in ib_umad_read()
404 static int is_duplicate(struct ib_umad_file *file,  in is_duplicate()  argument
411 	list_for_each_entry(sent_packet, &file->send_list, list) {  in is_duplicate()
437 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,  in ib_umad_write()
440 	struct ib_umad_file *file = filp->private_data;  in ib_umad_write()  local
449 	if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)  in ib_umad_write()
456 	if (copy_from_user(&packet->mad, buf, hdr_size(file))) {  in ib_umad_write()
466 	buf += hdr_size(file);  in ib_umad_write()
473 	mutex_lock(&file->mutex);  in ib_umad_write()
475 	agent = __get_agent(file, packet->mad.hdr.id);  in ib_umad_write()
485 	ah_attr.port_num      = file->port->port_num;  in ib_umad_write()
512 	data_len = count - hdr_size(file) - hdr_len;  in ib_umad_write()
555 	spin_lock_irq(&file->send_lock);  in ib_umad_write()
556 	ret = is_duplicate(file, packet);  in ib_umad_write()
558 		list_add_tail(&packet->list, &file->send_list);  in ib_umad_write()
559 	spin_unlock_irq(&file->send_lock);  in ib_umad_write()
569 	mutex_unlock(&file->mutex);  in ib_umad_write()
573 	dequeue_send(file, packet);  in ib_umad_write()
579 	mutex_unlock(&file->mutex);  in ib_umad_write()
585 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)  in ib_umad_poll()
587 	struct ib_umad_file *file = filp->private_data;  in ib_umad_poll()  local
592 	poll_wait(filp, &file->recv_wait, wait);  in ib_umad_poll()
594 	if (!list_empty(&file->recv_list))  in ib_umad_poll()
600 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,  in ib_umad_reg_agent()  argument
609 	mutex_lock(&file->port->file_mutex);  in ib_umad_reg_agent()
610 	mutex_lock(&file->mutex);  in ib_umad_reg_agent()
612 	if (!file->port->ib_dev) {  in ib_umad_reg_agent()
628 		if (!__get_agent(file, agent_id))  in ib_umad_reg_agent()
652 	agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,  in ib_umad_reg_agent()
656 				      send_handler, recv_handler, file);  in ib_umad_reg_agent()
669 	if (!file->already_used) {  in ib_umad_reg_agent()
670 		file->already_used = 1;  in ib_umad_reg_agent()
671 		if (!file->use_pkey_index) {  in ib_umad_reg_agent()
679 	file->agent[agent_id] = agent;  in ib_umad_reg_agent()
683 	mutex_unlock(&file->mutex);  in ib_umad_reg_agent()
688 	mutex_unlock(&file->port->file_mutex);  in ib_umad_reg_agent()
693 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)  in ib_umad_unreg_agent()  argument
702 	mutex_lock(&file->port->file_mutex);  in ib_umad_unreg_agent()
703 	mutex_lock(&file->mutex);  in ib_umad_unreg_agent()
705 	if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {  in ib_umad_unreg_agent()
710 	agent = file->agent[id];  in ib_umad_unreg_agent()
711 	file->agent[id] = NULL;  in ib_umad_unreg_agent()
714 	mutex_unlock(&file->mutex);  in ib_umad_unreg_agent()
719 	mutex_unlock(&file->port->file_mutex);  in ib_umad_unreg_agent()
724 static long ib_umad_enable_pkey(struct ib_umad_file *file)  in ib_umad_enable_pkey()  argument
728 	mutex_lock(&file->mutex);  in ib_umad_enable_pkey()
729 	if (file->already_used)  in ib_umad_enable_pkey()
732 		file->use_pkey_index = 1;  in ib_umad_enable_pkey()
733 	mutex_unlock(&file->mutex);  in ib_umad_enable_pkey()
738 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,  in ib_umad_ioctl()
754 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,  in ib_umad_compat_ioctl()
774  *    everything else is purely local to the file being created, so
777  *    file structure being operated on;
779 static int ib_umad_open(struct inode *inode, struct file *filp)  in ib_umad_open()
782 	struct ib_umad_file *file;  in ib_umad_open()  local
798 	file = kzalloc(sizeof *file, GFP_KERNEL);  in ib_umad_open()
799 	if (!file) {  in ib_umad_open()
805 	mutex_init(&file->mutex);  in ib_umad_open()
806 	spin_lock_init(&file->send_lock);  in ib_umad_open()
807 	INIT_LIST_HEAD(&file->recv_list);  in ib_umad_open()
808 	INIT_LIST_HEAD(&file->send_list);  in ib_umad_open()
809 	init_waitqueue_head(&file->recv_wait);  in ib_umad_open()
811 	file->port = port;  in ib_umad_open()
812 	filp->private_data = file;  in ib_umad_open()
814 	list_add_tail(&file->port_list, &port->file_list);  in ib_umad_open()
823 static int ib_umad_close(struct inode *inode, struct file *filp)  in ib_umad_close()
825 	struct ib_umad_file *file = filp->private_data;  in ib_umad_close()  local
826 	struct ib_umad_device *dev = file->port->umad_dev;  in ib_umad_close()
831 	mutex_lock(&file->port->file_mutex);  in ib_umad_close()
832 	mutex_lock(&file->mutex);  in ib_umad_close()
834 	already_dead = file->agents_dead;  in ib_umad_close()
835 	file->agents_dead = 1;  in ib_umad_close()
837 	list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {  in ib_umad_close()
843 	list_del(&file->port_list);  in ib_umad_close()
845 	mutex_unlock(&file->mutex);  in ib_umad_close()
849 			if (file->agent[i])  in ib_umad_close()
850 				ib_unregister_mad_agent(file->agent[i]);  in ib_umad_close()
852 	mutex_unlock(&file->port->file_mutex);  in ib_umad_close()
854 	kfree(file);  in ib_umad_close()
874 static int ib_umad_sm_open(struct inode *inode, struct file *filp)  in ib_umad_sm_open()
915 static int ib_umad_sm_close(struct inode *inode, struct file *filp)  in ib_umad_sm_close()
1086 	struct ib_umad_file *file;  in ib_umad_kill_port()  local
1102 	list_for_each_entry(file, &port->file_list, port_list) {  in ib_umad_kill_port()
1103 		mutex_lock(&file->mutex);  in ib_umad_kill_port()
1104 		file->agents_dead = 1;  in ib_umad_kill_port()
1105 		mutex_unlock(&file->mutex);  in ib_umad_kill_port()
1108 			if (file->agent[id])  in ib_umad_kill_port()
1109 				ib_unregister_mad_agent(file->agent[id]);  in ib_umad_kill_port()