/drivers/infiniband/core/user_mad.c

  1/*
  2 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
  3 *
  4 * This software is available to you under a choice of one of two
  5 * licenses.  You may choose to be licensed under the terms of the GNU
  6 * General Public License (GPL) Version 2, available from the file
  7 * COPYING in the main directory of this source tree, or the
  8 * OpenIB.org BSD license below:
  9 *
 10 *     Redistribution and use in source and binary forms, with or
 11 *     without modification, are permitted provided that the following
 12 *     conditions are met:
 13 *
 14 *      - Redistributions of source code must retain the above
 15 *        copyright notice, this list of conditions and the following
 16 *        disclaimer.
 17 *
 18 *      - Redistributions in binary form must reproduce the above
 19 *        copyright notice, this list of conditions and the following
 20 *        disclaimer in the documentation and/or other materials
 21 *        provided with the distribution.
 22 *
 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 30 * SOFTWARE.
 31 *
 32 * $Id: user_mad.c 1389 2004-12-27 22:56:47Z roland $
 33 */
 34
 35#include <linux/module.h>
 36#include <linux/init.h>
 37#include <linux/device.h>
 38#include <linux/err.h>
 39#include <linux/fs.h>
 40#include <linux/cdev.h>
 41#include <linux/pci.h>
 42#include <linux/dma-mapping.h>
 43#include <linux/poll.h>
 44#include <linux/rwsem.h>
 45#include <linux/kref.h>
 46
 47#include <asm/uaccess.h>
 48#include <asm/semaphore.h>
 49
 50#include <ib_mad.h>
 51#include <ib_user_mad.h>
 52
 53MODULE_AUTHOR("Roland Dreier");
 54MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
 55MODULE_LICENSE("Dual BSD/GPL");
 56
 57enum {
 58	IB_UMAD_MAX_PORTS  = 64,
 59	IB_UMAD_MAX_AGENTS = 32,
 60
 61	IB_UMAD_MAJOR      = 231,
 62	IB_UMAD_MINOR_BASE = 0
 63};
 64
 65struct ib_umad_port {
 66	int                    devnum;
 67	struct cdev            dev;
 68	struct class_device    class_dev;
 69
 70	int                    sm_devnum;
 71	struct cdev            sm_dev;
 72	struct class_device    sm_class_dev;
 73	struct semaphore       sm_sem;
 74
 75	struct ib_device      *ib_dev;
 76	struct ib_umad_device *umad_dev;
 77	u8                     port_num;
 78};
 79
 80struct ib_umad_device {
 81	int                  start_port, end_port;
 82	struct kref          ref;
 83	struct ib_umad_port  port[0];
 84};
 85
 86struct ib_umad_file {
 87	struct ib_umad_port *port;
 88	spinlock_t           recv_lock;
 89	struct list_head     recv_list;
 90	wait_queue_head_t    recv_wait;
 91	struct rw_semaphore  agent_mutex;
 92	struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
 93	struct ib_mr        *mr[IB_UMAD_MAX_AGENTS];
 94};
 95
 96struct ib_umad_packet {
 97	struct ib_user_mad mad;
 98	struct ib_ah      *ah;
 99	struct list_head   list;
100	DECLARE_PCI_UNMAP_ADDR(mapping)
101};
102
103static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
104static spinlock_t map_lock;
105static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS * 2);
106
107static void ib_umad_add_one(struct ib_device *device);
108static void ib_umad_remove_one(struct ib_device *device);
109
110static int queue_packet(struct ib_umad_file *file,
111			struct ib_mad_agent *agent,
112			struct ib_umad_packet *packet)
113{
114	int ret = 1;
115
116	down_read(&file->agent_mutex);
117	for (packet->mad.id = 0;
118	     packet->mad.id < IB_UMAD_MAX_AGENTS;
119	     packet->mad.id++)
120		if (agent == file->agent[packet->mad.id]) {
121			spin_lock_irq(&file->recv_lock);
122			list_add_tail(&packet->list, &file->recv_list);
123			spin_unlock_irq(&file->recv_lock);
124			wake_up_interruptible(&file->recv_wait);
125			ret = 0;
126			break;
127		}
128
129	up_read(&file->agent_mutex);
130
131	return ret;
132}
133
134static void send_handler(struct ib_mad_agent *agent,
135			 struct ib_mad_send_wc *send_wc)
136{
137	struct ib_umad_file *file = agent->context;
138	struct ib_umad_packet *packet =
139		(void *) (unsigned long) send_wc->wr_id;
140
141	dma_unmap_single(agent->device->dma_device,
142			 pci_unmap_addr(packet, mapping),
143			 sizeof packet->mad.data,
144			 DMA_TO_DEVICE);
145	ib_destroy_ah(packet->ah);
146
147	if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
148		packet->mad.status = ETIMEDOUT;
149
150		if (!queue_packet(file, agent, packet))
151			return;
152	}
153
154	kfree(packet);
155}
156
157static void recv_handler(struct ib_mad_agent *agent,
158			 struct ib_mad_recv_wc *mad_recv_wc)
159{
160	struct ib_umad_file *file = agent->context;
161	struct ib_umad_packet *packet;
162
163	if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
164		goto out;
165
166	packet = kmalloc(sizeof *packet, GFP_KERNEL);
167	if (!packet)
168		goto out;
169
170	memset(packet, 0, sizeof *packet);
171
172	memcpy(packet->mad.data, mad_recv_wc->recv_buf.mad, sizeof packet->mad.data);
173	packet->mad.status        = 0;
174	packet->mad.qpn 	  = cpu_to_be32(mad_recv_wc->wc->src_qp);
175	packet->mad.lid 	  = cpu_to_be16(mad_recv_wc->wc->slid);
176	packet->mad.sl  	  = mad_recv_wc->wc->sl;
177	packet->mad.path_bits 	  = mad_recv_wc->wc->dlid_path_bits;
178	packet->mad.grh_present   = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
179	if (packet->mad.grh_present) {
180		/* XXX parse GRH */
181		packet->mad.gid_index 	  = 0;
182		packet->mad.hop_limit 	  = 0;
183		packet->mad.traffic_class = 0;
184		memset(packet->mad.gid, 0, 16);
185		packet->mad.flow_label 	  = 0;
186	}
187
188	if (queue_packet(file, agent, packet))
189		kfree(packet);
190
191out:
192	ib_free_recv_mad(mad_recv_wc);
193}
194
195static ssize_t ib_umad_read(struct file *filp, char __user *buf,
196			    size_t count, loff_t *pos)
197{
198	struct ib_umad_file *file = filp->private_data;
199	struct ib_umad_packet *packet;
200	ssize_t ret;
201
202	if (count < sizeof (struct ib_user_mad))
203		return -EINVAL;
204
205	spin_lock_irq(&file->recv_lock);
206
207	while (list_empty(&file->recv_list)) {
208		spin_unlock_irq(&file->recv_lock);
209
210		if (filp->f_flags & O_NONBLOCK)
211			return -EAGAIN;
212
213		if (wait_event_interruptible(file->recv_wait,
214					     !list_empty(&file->recv_list)))
215			return -ERESTARTSYS;
216
217		spin_lock_irq(&file->recv_lock);
218	}
219
220	packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
221	list_del(&packet->list);
222
223	spin_unlock_irq(&file->recv_lock);
224
225	if (copy_to_user(buf, &packet->mad, sizeof packet->mad))
226		ret = -EFAULT;
227	else
228		ret = sizeof packet->mad;
229
230	kfree(packet);
231	return ret;
232}
233
234static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
235			     size_t count, loff_t *pos)
236{
237	struct ib_umad_file *file = filp->private_data;
238	struct ib_umad_packet *packet;
239	struct ib_mad_agent *agent;
240	struct ib_ah_attr ah_attr;
241	struct ib_sge      gather_list;
242	struct ib_send_wr *bad_wr, wr = {
243		.opcode      = IB_WR_SEND,
244		.sg_list     = &gather_list,
245		.num_sge     = 1,
246		.send_flags  = IB_SEND_SIGNALED,
247	};
248	u8 method;
249	u64 *tid;
250	int ret;
251
252	if (count < sizeof (struct ib_user_mad))
253		return -EINVAL;
254
255	packet = kmalloc(sizeof *packet, GFP_KERNEL);
256	if (!packet)
257		return -ENOMEM;
258
259	if (copy_from_user(&packet->mad, buf, sizeof packet->mad)) {
260		kfree(packet);
261		return -EFAULT;
262	}
263
264	if (packet->mad.id < 0 || packet->mad.id >= IB_UMAD_MAX_AGENTS) {
265		ret = -EINVAL;
266		goto err;
267	}
268
269	down_read(&file->agent_mutex);
270
271	agent = file->agent[packet->mad.id];
272	if (!agent) {
273		ret = -EINVAL;
274		goto err_up;
275	}
276
277	/*
278	 * If userspace is generating a request that will generate a
279	 * response, we need to make sure the high-order part of the
280	 * transaction ID matches the agent being used to send the
281	 * MAD.
282	 */
283	method = ((struct ib_mad_hdr *) packet->mad.data)->method;
284
285	if (!(method & IB_MGMT_METHOD_RESP)       &&
286	    method != IB_MGMT_METHOD_TRAP_REPRESS &&
287	    method != IB_MGMT_METHOD_SEND) {
288		tid = &((struct ib_mad_hdr *) packet->mad.data)->tid;
289		*tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
290				   (be64_to_cpup(tid) & 0xffffffff));
291	}
292
293	memset(&ah_attr, 0, sizeof ah_attr);
294	ah_attr.dlid          = be16_to_cpu(packet->mad.lid);
295	ah_attr.sl            = packet->mad.sl;
296	ah_attr.src_path_bits = packet->mad.path_bits;
297	ah_attr.port_num      = file->port->port_num;
298	if (packet->mad.grh_present) {
299		ah_attr.ah_flags = IB_AH_GRH;
300		memcpy(ah_attr.grh.dgid.raw, packet->mad.gid, 16);
301		ah_attr.grh.flow_label 	   = packet->mad.flow_label;
302		ah_attr.grh.hop_limit  	   = packet->mad.hop_limit;
303		ah_attr.grh.traffic_class  = packet->mad.traffic_class;
304	}
305
306	packet->ah = ib_create_ah(agent->qp->pd, &ah_attr);
307	if (IS_ERR(packet->ah)) {
308		ret = PTR_ERR(packet->ah);
309		goto err_up;
310	}
311
312	gather_list.addr = dma_map_single(agent->device->dma_device,
313					  packet->mad.data,
314					  sizeof packet->mad.data,
315					  DMA_TO_DEVICE);
316	gather_list.length = sizeof packet->mad.data;
317	gather_list.lkey   = file->mr[packet->mad.id]->lkey;
318	pci_unmap_addr_set(packet, mapping, gather_list.addr);
319
320	wr.wr.ud.mad_hdr     = (struct ib_mad_hdr *) packet->mad.data;
321	wr.wr.ud.ah          = packet->ah;
322	wr.wr.ud.remote_qpn  = be32_to_cpu(packet->mad.qpn);
323	wr.wr.ud.remote_qkey = be32_to_cpu(packet->mad.qkey);
324	wr.wr.ud.timeout_ms  = packet->mad.timeout_ms;
325
326	wr.wr_id            = (unsigned long) packet;
327
328	ret = ib_post_send_mad(agent, &wr, &bad_wr);
329	if (ret) {
330		dma_unmap_single(agent->device->dma_device,
331				 pci_unmap_addr(packet, mapping),
332				 sizeof packet->mad.data,
333				 DMA_TO_DEVICE);
334		goto err_up;
335	}
336
337	up_read(&file->agent_mutex);
338
339	return sizeof packet->mad;
340
341err_up:
342	up_read(&file->agent_mutex);
343
344err:
345	kfree(packet);
346	return ret;
347}
348
349static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
350{
351	struct ib_umad_file *file = filp->private_data;
352
353	/* we will always be able to post a MAD send */
354	unsigned int mask = POLLOUT | POLLWRNORM;
355
356	poll_wait(filp, &file->recv_wait, wait);
357
358	if (!list_empty(&file->recv_list))
359		mask |= POLLIN | POLLRDNORM;
360
361	return mask;
362}
363
364static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg)
365{
366	struct ib_user_mad_reg_req ureq;
367	struct ib_mad_reg_req req;
368	struct ib_mad_agent *agent;
369	int agent_id;
370	int ret;
371
372	down_write(&file->agent_mutex);
373
374	if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) {
375		ret = -EFAULT;
376		goto out;
377	}
378
379	if (ureq.qpn != 0 && ureq.qpn != 1) {
380		ret = -EINVAL;
381		goto out;
382	}
383
384	for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
385		if (!file->agent[agent_id])
386			goto found;
387
388	ret = -ENOMEM;
389	goto out;
390
391found:
392	req.mgmt_class         = ureq.mgmt_class;
393	req.mgmt_class_version = ureq.mgmt_class_version;
394	memcpy(req.method_mask, ureq.method_mask, sizeof req.method_mask);
395	memcpy(req.oui,         ureq.oui,         sizeof req.oui);
396
397	agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
398				      ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
399				      &req, 0, send_handler, recv_handler,
400				      file);
401	if (IS_ERR(agent)) {
402		ret = PTR_ERR(agent);
403		goto out;
404	}
405
406	file->agent[agent_id] = agent;
407
408	file->mr[agent_id] = ib_get_dma_mr(agent->qp->pd, IB_ACCESS_LOCAL_WRITE);
409	if (IS_ERR(file->mr[agent_id])) {
410		ret = -ENOMEM;
411		goto err;
412	}
413
414	if (put_user(agent_id,
415		     (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
416		ret = -EFAULT;
417		goto err_mr;
418	}
419
420	ret = 0;
421	goto out;
422
423err_mr:
424	ib_dereg_mr(file->mr[agent_id]);
425
426err:
427	file->agent[agent_id] = NULL;
428	ib_unregister_mad_agent(agent);
429
430out:
431	up_write(&file->agent_mutex);
432	return ret;
433}
434
435static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg)
436{
437	u32 id;
438	int ret = 0;
439
440	down_write(&file->agent_mutex);
441
442	if (get_user(id, (u32 __user *) arg)) {
443		ret = -EFAULT;
444		goto out;
445	}
446
447	if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !file->agent[id]) {
448		ret = -EINVAL;
449		goto out;
450	}
451
452	ib_dereg_mr(file->mr[id]);
453	ib_unregister_mad_agent(file->agent[id]);
454	file->agent[id] = NULL;
455
456out:
457	up_write(&file->agent_mutex);
458	return ret;
459}
460
461static long ib_umad_ioctl(struct file *filp,
462			 unsigned int cmd, unsigned long arg)
463{
464	switch (cmd) {
465	case IB_USER_MAD_REGISTER_AGENT:
466		return ib_umad_reg_agent(filp->private_data, arg);
467	case IB_USER_MAD_UNREGISTER_AGENT:
468		return ib_umad_unreg_agent(filp->private_data, arg);
469	default:
470		return -ENOIOCTLCMD;
471	}
472}
473
474static int ib_umad_open(struct inode *inode, struct file *filp)
475{
476	struct ib_umad_port *port =
477		container_of(inode->i_cdev, struct ib_umad_port, dev);
478	struct ib_umad_file *file;
479
480	file = kmalloc(sizeof *file, GFP_KERNEL);
481	if (!file)
482		return -ENOMEM;
483
484	memset(file, 0, sizeof *file);
485
486	spin_lock_init(&file->recv_lock);
487	init_rwsem(&file->agent_mutex);
488	INIT_LIST_HEAD(&file->recv_list);
489	init_waitqueue_head(&file->recv_wait);
490
491	file->port = port;
492	filp->private_data = file;
493
494	return 0;
495}
496
497static int ib_umad_close(struct inode *inode, struct file *filp)
498{
499	struct ib_umad_file *file = filp->private_data;
500	int i;
501
502	for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
503		if (file->agent[i]) {
504			ib_dereg_mr(file->mr[i]);
505			ib_unregister_mad_agent(file->agent[i]);
506		}
507
508	kfree(file);
509
510	return 0;
511}
512
513static struct file_operations umad_fops = {
514	.owner 	        = THIS_MODULE,
515	.read 	        = ib_umad_read,
516	.write 	        = ib_umad_write,
517	.poll 	        = ib_umad_poll,
518	.unlocked_ioctl = ib_umad_ioctl,
519	.compat_ioctl   = ib_umad_ioctl,
520	.open 	        = ib_umad_open,
521	.release        = ib_umad_close
522};
523
524static int ib_umad_sm_open(struct inode *inode, struct file *filp)
525{
526	struct ib_umad_port *port =
527		container_of(inode->i_cdev, struct ib_umad_port, sm_dev);
528	struct ib_port_modify props = {
529		.set_port_cap_mask = IB_PORT_SM
530	};
531	int ret;
532
533	if (filp->f_flags & O_NONBLOCK) {
534		if (down_trylock(&port->sm_sem))
535			return -EAGAIN;
536	} else {
537		if (down_interruptible(&port->sm_sem))
538			return -ERESTARTSYS;
539	}
540
541	ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
542	if (ret) {
543		up(&port->sm_sem);
544		return ret;
545	}
546
547	filp->private_data = port;
548
549	return 0;
550}
551
552static int ib_umad_sm_close(struct inode *inode, struct file *filp)
553{
554	struct ib_umad_port *port = filp->private_data;
555	struct ib_port_modify props = {
556		.clr_port_cap_mask = IB_PORT_SM
557	};
558	int ret;
559
560	ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
561	up(&port->sm_sem);
562
563	return ret;
564}
565
566static struct file_operations umad_sm_fops = {
567	.owner 	 = THIS_MODULE,
568	.open 	 = ib_umad_sm_open,
569	.release = ib_umad_sm_close
570};
571
572static struct ib_client umad_client = {
573	.name   = "umad",
574	.add    = ib_umad_add_one,
575	.remove = ib_umad_remove_one
576};
577
578static ssize_t show_dev(struct class_device *class_dev, char *buf)
579{
580	struct ib_umad_port *port = class_get_devdata(class_dev);
581
582	if (class_dev == &port->class_dev)
583		return print_dev_t(buf, port->dev.dev);
584	else
585		return print_dev_t(buf, port->sm_dev.dev);
586}
587static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL);
588
589static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
590{
591	struct ib_umad_port *port = class_get_devdata(class_dev);
592
593	return sprintf(buf, "%s\n", port->ib_dev->name);
594}
595static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
596
597static ssize_t show_port(struct class_device *class_dev, char *buf)
598{
599	struct ib_umad_port *port = class_get_devdata(class_dev);
600
601	return sprintf(buf, "%d\n", port->port_num);
602}
603static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
604
605static void ib_umad_release_dev(struct kref *ref)
606{
607	struct ib_umad_device *dev =
608		container_of(ref, struct ib_umad_device, ref);
609
610	kfree(dev);
611}
612
613static void ib_umad_release_port(struct class_device *class_dev)
614{
615	struct ib_umad_port *port = class_get_devdata(class_dev);
616
617	if (class_dev == &port->class_dev) {
618		cdev_del(&port->dev);
619		clear_bit(port->devnum, dev_map);
620	} else {
621		cdev_del(&port->sm_dev);
622		clear_bit(port->sm_devnum, dev_map);
623	}
624
625	kref_put(&port->umad_dev->ref, ib_umad_release_dev);
626}
627
628static struct class umad_class = {
629	.name    = "infiniband_mad",
630	.release = ib_umad_release_port
631};
632
633static ssize_t show_abi_version(struct class *class, char *buf)
634{
635	return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
636}
637static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
638
639static int ib_umad_init_port(struct ib_device *device, int port_num,
640			     struct ib_umad_port *port)
641{
642	spin_lock(&map_lock);
643	port->devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
644	if (port->devnum >= IB_UMAD_MAX_PORTS) {
645		spin_unlock(&map_lock);
646		return -1;
647	}
648	port->sm_devnum = find_next_zero_bit(dev_map, IB_UMAD_MAX_PORTS * 2, IB_UMAD_MAX_PORTS);
649	if (port->sm_devnum >= IB_UMAD_MAX_PORTS * 2) {
650		spin_unlock(&map_lock);
651		return -1;
652	}
653	set_bit(port->devnum, dev_map);
654	set_bit(port->sm_devnum, dev_map);
655	spin_unlock(&map_lock);
656
657	port->ib_dev   = device;
658	port->port_num = port_num;
659	init_MUTEX(&port->sm_sem);
660
661	cdev_init(&port->dev, &umad_fops);
662	port->dev.owner = THIS_MODULE;
663	kobject_set_name(&port->dev.kobj, "umad%d", port->devnum);
664	if (cdev_add(&port->dev, base_dev + port->devnum, 1))
665		return -1;
666
667	port->class_dev.class = &umad_class;
668	port->class_dev.dev   = device->dma_device;
669
670	snprintf(port->class_dev.class_id, BUS_ID_SIZE, "umad%d", port->devnum);
671
672	if (class_device_register(&port->class_dev))
673		goto err_cdev;
674
675	class_set_devdata(&port->class_dev, port);
676	kref_get(&port->umad_dev->ref);
677
678	if (class_device_create_file(&port->class_dev, &class_device_attr_dev))
679		goto err_class;
680	if (class_device_create_file(&port->class_dev, &class_device_attr_ibdev))
681		goto err_class;
682	if (class_device_create_file(&port->class_dev, &class_device_attr_port))
683		goto err_class;
684
685	cdev_init(&port->sm_dev, &umad_sm_fops);
686	port->sm_dev.owner = THIS_MODULE;
687	kobject_set_name(&port->dev.kobj, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS);
688	if (cdev_add(&port->sm_dev, base_dev + port->sm_devnum, 1))
689		return -1;
690
691	port->sm_class_dev.class = &umad_class;
692	port->sm_class_dev.dev   = device->dma_device;
693
694	snprintf(port->sm_class_dev.class_id, BUS_ID_SIZE, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS);
695
696	if (class_device_register(&port->sm_class_dev))
697		goto err_sm_cdev;
698
699	class_set_devdata(&port->sm_class_dev, port);
700	kref_get(&port->umad_dev->ref);
701
702	if (class_device_create_file(&port->sm_class_dev, &class_device_attr_dev))
703		goto err_sm_class;
704	if (class_device_create_file(&port->sm_class_dev, &class_device_attr_ibdev))
705		goto err_sm_class;
706	if (class_device_create_file(&port->sm_class_dev, &class_device_attr_port))
707		goto err_sm_class;
708
709	return 0;
710
711err_sm_class:
712	class_device_unregister(&port->sm_class_dev);
713
714err_sm_cdev:
715	cdev_del(&port->sm_dev);
716
717err_class:
718	class_device_unregister(&port->class_dev);
719
720err_cdev:
721	cdev_del(&port->dev);
722	clear_bit(port->devnum, dev_map);
723
724	return -1;
725}
726
727static void ib_umad_add_one(struct ib_device *device)
728{
729	struct ib_umad_device *umad_dev;
730	int s, e, i;
731
732	if (device->node_type == IB_NODE_SWITCH)
733		s = e = 0;
734	else {
735		s = 1;
736		e = device->phys_port_cnt;
737	}
738
739	umad_dev = kmalloc(sizeof *umad_dev +
740			   (e - s + 1) * sizeof (struct ib_umad_port),
741			   GFP_KERNEL);
742	if (!umad_dev)
743		return;
744
745	memset(umad_dev, 0, sizeof *umad_dev +
746	       (e - s + 1) * sizeof (struct ib_umad_port));
747
748	kref_init(&umad_dev->ref);
749
750	umad_dev->start_port = s;
751	umad_dev->end_port   = e;
752
753	for (i = s; i <= e; ++i) {
754		umad_dev->port[i - s].umad_dev = umad_dev;
755
756		if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
757			goto err;
758	}
759
760	ib_set_client_data(device, &umad_client, umad_dev);
761
762	return;
763
764err:
765	while (--i >= s) {
766		class_device_unregister(&umad_dev->port[i - s].class_dev);
767		class_device_unregister(&umad_dev->port[i - s].sm_class_dev);
768	}
769
770	kref_put(&umad_dev->ref, ib_umad_release_dev);
771}
772
773static void ib_umad_remove_one(struct ib_device *device)
774{
775	struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
776	int i;
777
778	if (!umad_dev)
779		return;
780
781	for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) {
782		class_device_unregister(&umad_dev->port[i].class_dev);
783		class_device_unregister(&umad_dev->port[i].sm_class_dev);
784	}
785
786	kref_put(&umad_dev->ref, ib_umad_release_dev);
787}
788
789static int __init ib_umad_init(void)
790{
791	int ret;
792
793	spin_lock_init(&map_lock);
794
795	ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
796				     "infiniband_mad");
797	if (ret) {
798		printk(KERN_ERR "user_mad: couldn't register device number\n");
799		goto out;
800	}
801
802	ret = class_register(&umad_class);
803	if (ret) {
804		printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
805		goto out_chrdev;
806	}
807
808	ret = class_create_file(&umad_class, &class_attr_abi_version);
809	if (ret) {
810		printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
811		goto out_class;
812	}
813
814	ret = ib_register_client(&umad_client);
815	if (ret) {
816		printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
817		goto out_class;
818	}
819
820	return 0;
821
822out_class:
823	class_unregister(&umad_class);
824
825out_chrdev:
826	unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
827
828out:
829	return ret;
830}
831
832static void __exit ib_umad_cleanup(void)
833{
834	ib_unregister_client(&umad_client);
835	class_unregister(&umad_class);
836	unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
837}
838
839module_init(ib_umad_init);
840module_exit(ib_umad_cleanup);