1	/*
2	* Copyright (c) 2004 Topspin Communications. All rights reserved.
3	* Copyright (c) 2005 Voltaire, Inc. All rights reserved.
4	* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
5	* Copyright (c) 2008 Cisco. All rights reserved.
6	*
7	* This software is available to you under a choice of one of two
8	* licenses. You may choose to be licensed under the terms of the GNU
9	* General Public License (GPL) Version 2, available from the file
10	* COPYING in the main directory of this source tree, or the
11	* OpenIB.org BSD license below:
12	*
13	* Redistribution and use in source and binary forms, with or
14	* without modification, are permitted provided that the following
15	* conditions are met:
16	*
17	* - Redistributions of source code must retain the above
18	* copyright notice, this list of conditions and the following
19	* disclaimer.
20	*
21	* - Redistributions in binary form must reproduce the above
22	* copyright notice, this list of conditions and the following
23	* disclaimer in the documentation and/or other materials
24	* provided with the distribution.
25	*
26	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33	* SOFTWARE.
34	*/
35
36	#define pr_fmt(fmt) "user_mad: " fmt
37
38	#include <linux/module.h>
39	#include <linux/init.h>
40	#include <linux/device.h>
41	#include <linux/err.h>
42	#include <linux/fs.h>
43	#include <linux/cdev.h>
44	#include <linux/dma-mapping.h>
45	#include <linux/poll.h>
46	#include <linux/mutex.h>
47	#include <linux/kref.h>
48	#include <linux/compat.h>
49	#include <linux/sched.h>
50	#include <linux/semaphore.h>
51	#include <linux/slab.h>
52	#include <linux/nospec.h>
53
54	#include <linux/uaccess.h>
55
56	#include <rdma/ib_mad.h>
57	#include <rdma/ib_user_mad.h>
58	#include <rdma/rdma_netlink.h>
59
60	#include "core_priv.h"
61
62	MODULE_AUTHOR("Roland Dreier");
63	MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
64	MODULE_LICENSE("Dual BSD/GPL");
65
66	enum {
67	IB_UMAD_MAX_PORTS = RDMA_MAX_PORTS,
68	IB_UMAD_MAX_AGENTS = 32,
69
70	IB_UMAD_MAJOR = 231,
71	IB_UMAD_MINOR_BASE = 0,
72	IB_UMAD_NUM_FIXED_MINOR = 64,
73	IB_UMAD_NUM_DYNAMIC_MINOR = IB_UMAD_MAX_PORTS - IB_UMAD_NUM_FIXED_MINOR,
74	IB_ISSM_MINOR_BASE = IB_UMAD_NUM_FIXED_MINOR,
75	};
76
77	/*
78	* Our lifetime rules for these structs are the following:
79	* device special file is opened, we take a reference on the
80	* ib_umad_port's struct ib_umad_device. We drop these
81	* references in the corresponding close().
82	*
83	* In addition to references coming from open character devices, there
84	* is one more reference to each ib_umad_device representing the
85	* module's reference taken when allocating the ib_umad_device in
86	* ib_umad_add_one().
87	*
88	* When destroying an ib_umad_device, we drop the module's reference.
89	*/
90
91	struct ib_umad_port {
92	struct cdev cdev;
93	struct device dev;
94	struct cdev sm_cdev;
95	struct device sm_dev;
96	struct semaphore sm_sem;
97
98	struct mutex file_mutex;
99	struct list_head file_list;
100
101	struct ib_device *ib_dev;
102	struct ib_umad_device *umad_dev;
103	int dev_num;
104	u32 port_num;
105	};
106
107	struct ib_umad_device {
108	struct kref kref;
109	struct ib_umad_port ports[];
110	};
111
112	struct ib_umad_file {
113	struct mutex mutex;
114	struct ib_umad_port *port;
115	struct list_head recv_list;
116	struct list_head send_list;
117	struct list_head port_list;
118	spinlock_t send_lock;
119	wait_queue_head_t recv_wait;
120	struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
121	int agents_dead;
122	u8 use_pkey_index;
123	u8 already_used;
124	};
125
126	struct ib_umad_packet {
127	struct ib_mad_send_buf *msg;
128	struct ib_mad_recv_wc *recv_wc;
129	struct list_head list;
130	int length;
131	struct ib_user_mad mad;
132	};
133
134	struct ib_rmpp_mad_hdr {
135	struct ib_mad_hdr mad_hdr;
136	struct ib_rmpp_hdr rmpp_hdr;
137	} __packed;
138
139	#define CREATE_TRACE_POINTS
140	#include <trace/events/ib_umad.h>
141
142	static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
143	static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) +
144	IB_UMAD_NUM_FIXED_MINOR;
145	static dev_t dynamic_umad_dev;
146	static dev_t dynamic_issm_dev;
147
148	static DEFINE_IDA(umad_ida);
149
150	static int ib_umad_add_one(struct ib_device *device);
151	static void ib_umad_remove_one(struct ib_device *device, void *client_data);
152
153	static void ib_umad_dev_free(struct kref *kref)
154	{
155	struct ib_umad_device *dev =
156	container_of(kref, struct ib_umad_device, kref);
157
158	kfree(objp: dev);
159	}
160
161	static void ib_umad_dev_get(struct ib_umad_device *dev)
162	{
163	kref_get(kref: &dev->kref);
164	}
165
166	static void ib_umad_dev_put(struct ib_umad_device *dev)
167	{
168	kref_put(kref: &dev->kref, release: ib_umad_dev_free);
169	}
170
171	static int hdr_size(struct ib_umad_file *file)
172	{
173	return file->use_pkey_index ? sizeof(struct ib_user_mad_hdr) :
174	sizeof(struct ib_user_mad_hdr_old);
175	}
176
177	/* caller must hold file->mutex */
178	static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
179	{
180	return file->agents_dead ? NULL : file->agent[id];
181	}
182
183	static int queue_packet(struct ib_umad_file *file,
184	struct ib_mad_agent *agent,
185	struct ib_umad_packet *packet)
186	{
187	int ret = 1;
188
189	mutex_lock(&file->mutex);
190
191	for (packet->mad.hdr.id = 0;
192	packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
193	packet->mad.hdr.id++)
194	if (agent == __get_agent(file, id: packet->mad.hdr.id)) {
195	list_add_tail(new: &packet->list, head: &file->recv_list);
196	wake_up_interruptible(&file->recv_wait);
197	ret = 0;
198	break;
199	}
200
201	mutex_unlock(lock: &file->mutex);
202
203	return ret;
204	}
205
206	static void dequeue_send(struct ib_umad_file *file,
207	struct ib_umad_packet *packet)
208	{
209	spin_lock_irq(lock: &file->send_lock);
210	list_del(entry: &packet->list);
211	spin_unlock_irq(lock: &file->send_lock);
212	}
213
214	static void send_handler(struct ib_mad_agent *agent,
215	struct ib_mad_send_wc *send_wc)
216	{
217	struct ib_umad_file *file = agent->context;
218	struct ib_umad_packet *packet = send_wc->send_buf->context[0];
219
220	dequeue_send(file, packet);
221	rdma_destroy_ah(ah: packet->msg->ah, flags: RDMA_DESTROY_AH_SLEEPABLE);
222	ib_free_send_mad(send_buf: packet->msg);
223
224	if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
225	packet->length = IB_MGMT_MAD_HDR;
226	packet->mad.hdr.status = ETIMEDOUT;
227	if (!queue_packet(file, agent, packet))
228	return;
229	}
230	kfree(objp: packet);
231	}
232
233	static void recv_handler(struct ib_mad_agent *agent,
234	struct ib_mad_send_buf *send_buf,
235	struct ib_mad_recv_wc *mad_recv_wc)
236	{
237	struct ib_umad_file *file = agent->context;
238	struct ib_umad_packet *packet;
239
240	if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
241	goto err1;
242
243	packet = kzalloc(size: sizeof *packet, GFP_KERNEL);
244	if (!packet)
245	goto err1;
246
247	packet->length = mad_recv_wc->mad_len;
248	packet->recv_wc = mad_recv_wc;
249
250	packet->mad.hdr.status = 0;
251	packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
252	packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
253	/*
254	* On OPA devices it is okay to lose the upper 16 bits of LID as this
255	* information is obtained elsewhere. Mask off the upper 16 bits.
256	*/
257	if (rdma_cap_opa_mad(device: agent->device, port_num: agent->port_num))
258	packet->mad.hdr.lid = ib_lid_be16(lid: 0xFFFF &
259	mad_recv_wc->wc->slid);
260	else
261	packet->mad.hdr.lid = ib_lid_be16(lid: mad_recv_wc->wc->slid);
262	packet->mad.hdr.sl = mad_recv_wc->wc->sl;
263	packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
264	packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
265	packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
266	if (packet->mad.hdr.grh_present) {
267	struct rdma_ah_attr ah_attr;
268	const struct ib_global_route *grh;
269	int ret;
270
271	ret = ib_init_ah_attr_from_wc(device: agent->device, port_num: agent->port_num,
272	wc: mad_recv_wc->wc,
273	grh: mad_recv_wc->recv_buf.grh,
274	ah_attr: &ah_attr);
275	if (ret)
276	goto err2;
277
278	grh = rdma_ah_read_grh(attr: &ah_attr);
279	packet->mad.hdr.gid_index = grh->sgid_index;
280	packet->mad.hdr.hop_limit = grh->hop_limit;
281	packet->mad.hdr.traffic_class = grh->traffic_class;
282	memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
283	packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
284	rdma_destroy_ah_attr(ah_attr: &ah_attr);
285	}
286
287	if (queue_packet(file, agent, packet))
288	goto err2;
289	return;
290
291	err2:
292	kfree(objp: packet);
293	err1:
294	ib_free_recv_mad(mad_recv_wc);
295	}
296
297	static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
298	struct ib_umad_packet *packet, size_t count)
299	{
300	struct ib_mad_recv_buf *recv_buf;
301	int left, seg_payload, offset, max_seg_payload;
302	size_t seg_size;
303
304	recv_buf = &packet->recv_wc->recv_buf;
305	seg_size = packet->recv_wc->mad_seg_size;
306
307	/* We need enough room to copy the first (or only) MAD segment. */
308	if ((packet->length <= seg_size &&
309	count < hdr_size(file) + packet->length) ||
310	(packet->length > seg_size &&
311	count < hdr_size(file) + seg_size))
312	return -EINVAL;
313
314	if (copy_to_user(to: buf, from: &packet->mad, n: hdr_size(file)))
315	return -EFAULT;
316
317	buf += hdr_size(file);
318	seg_payload = min_t(int, packet->length, seg_size);
319	if (copy_to_user(to: buf, from: recv_buf->mad, n: seg_payload))
320	return -EFAULT;
321
322	if (seg_payload < packet->length) {
323	/*
324	* Multipacket RMPP MAD message. Copy remainder of message.
325	* Note that last segment may have a shorter payload.
326	*/
327	if (count < hdr_size(file) + packet->length) {
328	/*
329	* The buffer is too small, return the first RMPP segment,
330	* which includes the RMPP message length.
331	*/
332	return -ENOSPC;
333	}
334	offset = ib_get_mad_data_offset(mgmt_class: recv_buf->mad->mad_hdr.mgmt_class);
335	max_seg_payload = seg_size - offset;
336
337	for (left = packet->length - seg_payload, buf += seg_payload;
338	left; left -= seg_payload, buf += seg_payload) {
339	recv_buf = container_of(recv_buf->list.next,
340	struct ib_mad_recv_buf, list);
341	seg_payload = min(left, max_seg_payload);
342	if (copy_to_user(to: buf, from: ((void *) recv_buf->mad) + offset,
343	n: seg_payload))
344	return -EFAULT;
345	}
346	}
347
348	trace_ib_umad_read_recv(file, umad_hdr: &packet->mad.hdr, mad_hdr: &recv_buf->mad->mad_hdr);
349
350	return hdr_size(file) + packet->length;
351	}
352
353	static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
354	struct ib_umad_packet *packet, size_t count)
355	{
356	ssize_t size = hdr_size(file) + packet->length;
357
358	if (count < size)
359	return -EINVAL;
360
361	if (copy_to_user(to: buf, from: &packet->mad, n: hdr_size(file)))
362	return -EFAULT;
363
364	buf += hdr_size(file);
365
366	if (copy_to_user(to: buf, from: packet->mad.data, n: packet->length))
367	return -EFAULT;
368
369	trace_ib_umad_read_send(file, umad_hdr: &packet->mad.hdr,
370	mad_hdr: (struct ib_mad_hdr *)&packet->mad.data);
371
372	return size;
373	}
374
375	static ssize_t ib_umad_read(struct file *filp, char __user *buf,
376	size_t count, loff_t *pos)
377	{
378	struct ib_umad_file *file = filp->private_data;
379	struct ib_umad_packet *packet;
380	ssize_t ret;
381
382	if (count < hdr_size(file))
383	return -EINVAL;
384
385	mutex_lock(&file->mutex);
386
387	if (file->agents_dead) {
388	mutex_unlock(lock: &file->mutex);
389	return -EIO;
390	}
391
392	while (list_empty(head: &file->recv_list)) {
393	mutex_unlock(lock: &file->mutex);
394
395	if (filp->f_flags & O_NONBLOCK)
396	return -EAGAIN;
397
398	if (wait_event_interruptible(file->recv_wait,
399	!list_empty(&file->recv_list)))
400	return -ERESTARTSYS;
401
402	mutex_lock(&file->mutex);
403	}
404
405	if (file->agents_dead) {
406	mutex_unlock(lock: &file->mutex);
407	return -EIO;
408	}
409
410	packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
411	list_del(entry: &packet->list);
412
413	mutex_unlock(lock: &file->mutex);
414
415	if (packet->recv_wc)
416	ret = copy_recv_mad(file, buf, packet, count);
417	else
418	ret = copy_send_mad(file, buf, packet, count);
419
420	if (ret < 0) {
421	/* Requeue packet */
422	mutex_lock(&file->mutex);
423	list_add(new: &packet->list, head: &file->recv_list);
424	mutex_unlock(lock: &file->mutex);
425	} else {
426	if (packet->recv_wc)
427	ib_free_recv_mad(mad_recv_wc: packet->recv_wc);
428	kfree(objp: packet);
429	}
430	return ret;
431	}
432
433	static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
434	{
435	int left, seg;
436
437	/* Copy class specific header */
438	if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
439	copy_from_user(to: msg->mad + IB_MGMT_RMPP_HDR, from: buf + IB_MGMT_RMPP_HDR,
440	n: msg->hdr_len - IB_MGMT_RMPP_HDR))
441	return -EFAULT;
442
443	/* All headers are in place. Copy data segments. */
444	for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
445	seg++, left -= msg->seg_size, buf += msg->seg_size) {
446	if (copy_from_user(to: ib_get_rmpp_segment(send_buf: msg, seg_num: seg), from: buf,
447	min(left, msg->seg_size)))
448	return -EFAULT;
449	}
450	return 0;
451	}
452
453	static int same_destination(struct ib_user_mad_hdr *hdr1,
454	struct ib_user_mad_hdr *hdr2)
455	{
456	if (!hdr1->grh_present && !hdr2->grh_present)
457	return (hdr1->lid == hdr2->lid);
458
459	if (hdr1->grh_present && hdr2->grh_present)
460	return !memcmp(p: hdr1->gid, q: hdr2->gid, size: 16);
461
462	return 0;
463	}
464
465	static int is_duplicate(struct ib_umad_file *file,
466	struct ib_umad_packet *packet)
467	{
468	struct ib_umad_packet *sent_packet;
469	struct ib_mad_hdr *sent_hdr, *hdr;
470
471	hdr = (struct ib_mad_hdr *) packet->mad.data;
472	list_for_each_entry(sent_packet, &file->send_list, list) {
473	sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
474
475	if ((hdr->tid != sent_hdr->tid) ||
476	(hdr->mgmt_class != sent_hdr->mgmt_class))
477	continue;
478
479	/*
480	* No need to be overly clever here. If two new operations have
481	* the same TID, reject the second as a duplicate. This is more
482	* restrictive than required by the spec.
483	*/
484	if (!ib_response_mad(hdr)) {
485	if (!ib_response_mad(hdr: sent_hdr))
486	return 1;
487	continue;
488	} else if (!ib_response_mad(hdr: sent_hdr))
489	continue;
490
491	if (same_destination(hdr1: &packet->mad.hdr, hdr2: &sent_packet->mad.hdr))
492	return 1;
493	}
494
495	return 0;
496	}
497
498	static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
499	size_t count, loff_t *pos)
500	{
501	struct ib_umad_file *file = filp->private_data;
502	struct ib_rmpp_mad_hdr *rmpp_mad_hdr;
503	struct ib_umad_packet *packet;
504	struct ib_mad_agent *agent;
505	struct rdma_ah_attr ah_attr;
506	struct ib_ah *ah;
507	__be64 *tid;
508	int ret, data_len, hdr_len, copy_offset, rmpp_active;
509	u8 base_version;
510
511	if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
512	return -EINVAL;
513
514	packet = kzalloc(size: sizeof(*packet) + IB_MGMT_RMPP_HDR, GFP_KERNEL);
515	if (!packet)
516	return -ENOMEM;
517
518	if (copy_from_user(to: &packet->mad, from: buf, n: hdr_size(file))) {
519	ret = -EFAULT;
520	goto err;
521	}
522
523	if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
524	ret = -EINVAL;
525	goto err;
526	}
527
528	buf += hdr_size(file);
529
530	if (copy_from_user(to: packet->mad.data, from: buf, n: IB_MGMT_RMPP_HDR)) {
531	ret = -EFAULT;
532	goto err;
533	}
534
535	mutex_lock(&file->mutex);
536
537	trace_ib_umad_write(file, umad_hdr: &packet->mad.hdr,
538	mad_hdr: (struct ib_mad_hdr *)&packet->mad.data);
539
540	agent = __get_agent(file, id: packet->mad.hdr.id);
541	if (!agent) {
542	ret = -EIO;
543	goto err_up;
544	}
545
546	memset(&ah_attr, 0, sizeof ah_attr);
547	ah_attr.type = rdma_ah_find_type(dev: agent->device,
548	port_num: file->port->port_num);
549	rdma_ah_set_dlid(attr: &ah_attr, be16_to_cpu(packet->mad.hdr.lid));
550	rdma_ah_set_sl(attr: &ah_attr, sl: packet->mad.hdr.sl);
551	rdma_ah_set_path_bits(attr: &ah_attr, src_path_bits: packet->mad.hdr.path_bits);
552	rdma_ah_set_port_num(attr: &ah_attr, port_num: file->port->port_num);
553	if (packet->mad.hdr.grh_present) {
554	rdma_ah_set_grh(attr: &ah_attr, NULL,
555	be32_to_cpu(packet->mad.hdr.flow_label),
556	sgid_index: packet->mad.hdr.gid_index,
557	hop_limit: packet->mad.hdr.hop_limit,
558	traffic_class: packet->mad.hdr.traffic_class);
559	rdma_ah_set_dgid_raw(attr: &ah_attr, dgid: packet->mad.hdr.gid);
560	}
561
562	ah = rdma_create_user_ah(pd: agent->qp->pd, ah_attr: &ah_attr, NULL);
563	if (IS_ERR(ptr: ah)) {
564	ret = PTR_ERR(ptr: ah);
565	goto err_up;
566	}
567
568	rmpp_mad_hdr = (struct ib_rmpp_mad_hdr *)packet->mad.data;
569	hdr_len = ib_get_mad_data_offset(mgmt_class: rmpp_mad_hdr->mad_hdr.mgmt_class);
570
571	if (ib_is_mad_class_rmpp(mgmt_class: rmpp_mad_hdr->mad_hdr.mgmt_class)
572	&& ib_mad_kernel_rmpp_agent(agent)) {
573	copy_offset = IB_MGMT_RMPP_HDR;
574	rmpp_active = ib_get_rmpp_flags(rmpp_hdr: &rmpp_mad_hdr->rmpp_hdr) &
575	IB_MGMT_RMPP_FLAG_ACTIVE;
576	} else {
577	copy_offset = IB_MGMT_MAD_HDR;
578	rmpp_active = 0;
579	}
580
581	base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
582	data_len = count - hdr_size(file) - hdr_len;
583	packet->msg = ib_create_send_mad(mad_agent: agent,
584	be32_to_cpu(packet->mad.hdr.qpn),
585	pkey_index: packet->mad.hdr.pkey_index, rmpp_active,
586	hdr_len, data_len, GFP_KERNEL,
587	base_version);
588	if (IS_ERR(ptr: packet->msg)) {
589	ret = PTR_ERR(ptr: packet->msg);
590	goto err_ah;
591	}
592
593	packet->msg->ah = ah;
594	packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
595	packet->msg->retries = packet->mad.hdr.retries;
596	packet->msg->context[0] = packet;
597
598	/* Copy MAD header. Any RMPP header is already in place. */
599	memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
600
601	if (!rmpp_active) {
602	if (copy_from_user(to: packet->msg->mad + copy_offset,
603	from: buf + copy_offset,
604	n: hdr_len + data_len - copy_offset)) {
605	ret = -EFAULT;
606	goto err_msg;
607	}
608	} else {
609	ret = copy_rmpp_mad(msg: packet->msg, buf);
610	if (ret)
611	goto err_msg;
612	}
613
614	/*
615	* Set the high-order part of the transaction ID to make MADs from
616	* different agents unique, and allow routing responses back to the
617	* original requestor.
618	*/
619	if (!ib_response_mad(hdr: packet->msg->mad)) {
620	tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
621	*tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
622	(be64_to_cpup(tid) & 0xffffffff));
623	rmpp_mad_hdr->mad_hdr.tid = *tid;
624	}
625
626	if (!ib_mad_kernel_rmpp_agent(agent)
627	&& ib_is_mad_class_rmpp(mgmt_class: rmpp_mad_hdr->mad_hdr.mgmt_class)
628	&& (ib_get_rmpp_flags(rmpp_hdr: &rmpp_mad_hdr->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
629	spin_lock_irq(lock: &file->send_lock);
630	list_add_tail(new: &packet->list, head: &file->send_list);
631	spin_unlock_irq(lock: &file->send_lock);
632	} else {
633	spin_lock_irq(lock: &file->send_lock);
634	ret = is_duplicate(file, packet);
635	if (!ret)
636	list_add_tail(new: &packet->list, head: &file->send_list);
637	spin_unlock_irq(lock: &file->send_lock);
638	if (ret) {
639	ret = -EINVAL;
640	goto err_msg;
641	}
642	}
643
644	ret = ib_post_send_mad(send_buf: packet->msg, NULL);
645	if (ret)
646	goto err_send;
647
648	mutex_unlock(lock: &file->mutex);
649	return count;
650
651	err_send:
652	dequeue_send(file, packet);
653	err_msg:
654	ib_free_send_mad(send_buf: packet->msg);
655	err_ah:
656	rdma_destroy_ah(ah, flags: RDMA_DESTROY_AH_SLEEPABLE);
657	err_up:
658	mutex_unlock(lock: &file->mutex);
659	err:
660	kfree(objp: packet);
661	return ret;
662	}
663
664	static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
665	{
666	struct ib_umad_file *file = filp->private_data;
667
668	/* we will always be able to post a MAD send */
669	__poll_t mask = EPOLLOUT | EPOLLWRNORM;
670
671	mutex_lock(&file->mutex);
672	poll_wait(filp, wait_address: &file->recv_wait, p: wait);
673
674	if (!list_empty(head: &file->recv_list))
675	mask |= EPOLLIN | EPOLLRDNORM;
676	if (file->agents_dead)
677	mask = EPOLLERR;
678	mutex_unlock(lock: &file->mutex);
679
680	return mask;
681	}
682
683	static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
684	int compat_method_mask)
685	{
686	struct ib_user_mad_reg_req ureq;
687	struct ib_mad_reg_req req;
688	struct ib_mad_agent *agent = NULL;
689	int agent_id;
690	int ret;
691
692	mutex_lock(&file->port->file_mutex);
693	mutex_lock(&file->mutex);
694
695	if (!file->port->ib_dev) {
696	dev_notice(&file->port->dev, "%s: invalid device\n", __func__);
697	ret = -EPIPE;
698	goto out;
699	}
700
701	if (copy_from_user(to: &ureq, from: arg, n: sizeof ureq)) {
702	ret = -EFAULT;
703	goto out;
704	}
705
706	if (ureq.qpn != 0 && ureq.qpn != 1) {
707	dev_notice(&file->port->dev,
708	"%s: invalid QPN %u specified\n", __func__,
709	ureq.qpn);
710	ret = -EINVAL;
711	goto out;
712	}
713
714	for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
715	if (!__get_agent(file, id: agent_id))
716	goto found;
717
718	dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__,
719	IB_UMAD_MAX_AGENTS);
720
721	ret = -ENOMEM;
722	goto out;
723
724	found:
725	if (ureq.mgmt_class) {
726	memset(&req, 0, sizeof(req));
727	req.mgmt_class = ureq.mgmt_class;
728	req.mgmt_class_version = ureq.mgmt_class_version;
729	memcpy(req.oui, ureq.oui, sizeof req.oui);
730
731	if (compat_method_mask) {
732	u32 *umm = (u32 *) ureq.method_mask;
733	int i;
734
735	for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
736	req.method_mask[i] =
737	umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
738	} else
739	memcpy(req.method_mask, ureq.method_mask,
740	sizeof req.method_mask);
741	}
742
743	agent = ib_register_mad_agent(device: file->port->ib_dev, port_num: file->port->port_num,
744	qp_type: ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
745	mad_reg_req: ureq.mgmt_class ? &req : NULL,
746	rmpp_version: ureq.rmpp_version,
747	send_handler, recv_handler, context: file, registration_flags: 0);
748	if (IS_ERR(ptr: agent)) {
749	ret = PTR_ERR(ptr: agent);
750	agent = NULL;
751	goto out;
752	}
753
754	if (put_user(agent_id,
755	(u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
756	ret = -EFAULT;
757	goto out;
758	}
759
760	if (!file->already_used) {
761	file->already_used = 1;
762	if (!file->use_pkey_index) {
763	dev_warn(&file->port->dev,
764	"process %s did not enable P_Key index support.\n",
765	current->comm);
766	dev_warn(&file->port->dev,
767	" Documentation/infiniband/user_mad.rst has info on the new ABI.\n");
768	}
769	}
770
771	file->agent[agent_id] = agent;
772	ret = 0;
773
774	out:
775	mutex_unlock(lock: &file->mutex);
776
777	if (ret && agent)
778	ib_unregister_mad_agent(mad_agent: agent);
779
780	mutex_unlock(lock: &file->port->file_mutex);
781
782	return ret;
783	}
784
785	static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
786	{
787	struct ib_user_mad_reg_req2 ureq;
788	struct ib_mad_reg_req req;
789	struct ib_mad_agent *agent = NULL;
790	int agent_id;
791	int ret;
792
793	mutex_lock(&file->port->file_mutex);
794	mutex_lock(&file->mutex);
795
796	if (!file->port->ib_dev) {
797	dev_notice(&file->port->dev, "%s: invalid device\n", __func__);
798	ret = -EPIPE;
799	goto out;
800	}
801
802	if (copy_from_user(to: &ureq, from: arg, n: sizeof(ureq))) {
803	ret = -EFAULT;
804	goto out;
805	}
806
807	if (ureq.qpn != 0 && ureq.qpn != 1) {
808	dev_notice(&file->port->dev, "%s: invalid QPN %u specified\n",
809	__func__, ureq.qpn);
810	ret = -EINVAL;
811	goto out;
812	}
813
814	if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
815	dev_notice(&file->port->dev,
816	"%s failed: invalid registration flags specified 0x%x; supported 0x%x\n",
817	__func__, ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
818	ret = -EINVAL;
819
820	if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
821	(u32 __user *) (arg + offsetof(struct
822	ib_user_mad_reg_req2, flags))))
823	ret = -EFAULT;
824
825	goto out;
826	}
827
828	for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
829	if (!__get_agent(file, id: agent_id))
830	goto found;
831
832	dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__,
833	IB_UMAD_MAX_AGENTS);
834	ret = -ENOMEM;
835	goto out;
836
837	found:
838	if (ureq.mgmt_class) {
839	memset(&req, 0, sizeof(req));
840	req.mgmt_class = ureq.mgmt_class;
841	req.mgmt_class_version = ureq.mgmt_class_version;
842	if (ureq.oui & 0xff000000) {
843	dev_notice(&file->port->dev,
844	"%s failed: oui invalid 0x%08x\n", __func__,
845	ureq.oui);
846	ret = -EINVAL;
847	goto out;
848	}
849	req.oui[2] = ureq.oui & 0x0000ff;
850	req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
851	req.oui[0] = (ureq.oui & 0xff0000) >> 16;
852	memcpy(req.method_mask, ureq.method_mask,
853	sizeof(req.method_mask));
854	}
855
856	agent = ib_register_mad_agent(device: file->port->ib_dev, port_num: file->port->port_num,
857	qp_type: ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
858	mad_reg_req: ureq.mgmt_class ? &req : NULL,
859	rmpp_version: ureq.rmpp_version,
860	send_handler, recv_handler, context: file,
861	registration_flags: ureq.flags);
862	if (IS_ERR(ptr: agent)) {
863	ret = PTR_ERR(ptr: agent);
864	agent = NULL;
865	goto out;
866	}
867
868	if (put_user(agent_id,
869	(u32 __user *)(arg +
870	offsetof(struct ib_user_mad_reg_req2, id)))) {
871	ret = -EFAULT;
872	goto out;
873	}
874
875	if (!file->already_used) {
876	file->already_used = 1;
877	file->use_pkey_index = 1;
878	}
879
880	file->agent[agent_id] = agent;
881	ret = 0;
882
883	out:
884	mutex_unlock(lock: &file->mutex);
885
886	if (ret && agent)
887	ib_unregister_mad_agent(mad_agent: agent);
888
889	mutex_unlock(lock: &file->port->file_mutex);
890
891	return ret;
892	}
893
894
895	static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
896	{
897	struct ib_mad_agent *agent = NULL;
898	u32 id;
899	int ret = 0;
900
901	if (get_user(id, arg))
902	return -EFAULT;
903	if (id >= IB_UMAD_MAX_AGENTS)
904	return -EINVAL;
905
906	mutex_lock(&file->port->file_mutex);
907	mutex_lock(&file->mutex);
908
909	id = array_index_nospec(id, IB_UMAD_MAX_AGENTS);
910	if (!__get_agent(file, id)) {
911	ret = -EINVAL;
912	goto out;
913	}
914
915	agent = file->agent[id];
916	file->agent[id] = NULL;
917
918	out:
919	mutex_unlock(lock: &file->mutex);
920
921	if (agent)
922	ib_unregister_mad_agent(mad_agent: agent);
923
924	mutex_unlock(lock: &file->port->file_mutex);
925
926	return ret;
927	}
928
929	static long ib_umad_enable_pkey(struct ib_umad_file *file)
930	{
931	int ret = 0;
932
933	mutex_lock(&file->mutex);
934	if (file->already_used)
935	ret = -EINVAL;
936	else
937	file->use_pkey_index = 1;
938	mutex_unlock(lock: &file->mutex);
939
940	return ret;
941	}
942
943	static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
944	unsigned long arg)
945	{
946	switch (cmd) {
947	case IB_USER_MAD_REGISTER_AGENT:
948	return ib_umad_reg_agent(file: filp->private_data, arg: (void __user *) arg, compat_method_mask: 0);
949	case IB_USER_MAD_UNREGISTER_AGENT:
950	return ib_umad_unreg_agent(file: filp->private_data, arg: (__u32 __user *) arg);
951	case IB_USER_MAD_ENABLE_PKEY:
952	return ib_umad_enable_pkey(file: filp->private_data);
953	case IB_USER_MAD_REGISTER_AGENT2:
954	return ib_umad_reg_agent2(file: filp->private_data, arg: (void __user *) arg);
955	default:
956	return -ENOIOCTLCMD;
957	}
958	}
959
960	#ifdef CONFIG_COMPAT
961	static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
962	unsigned long arg)
963	{
964	switch (cmd) {
965	case IB_USER_MAD_REGISTER_AGENT:
966	return ib_umad_reg_agent(file: filp->private_data, arg: compat_ptr(uptr: arg), compat_method_mask: 1);
967	case IB_USER_MAD_UNREGISTER_AGENT:
968	return ib_umad_unreg_agent(file: filp->private_data, arg: compat_ptr(uptr: arg));
969	case IB_USER_MAD_ENABLE_PKEY:
970	return ib_umad_enable_pkey(file: filp->private_data);
971	case IB_USER_MAD_REGISTER_AGENT2:
972	return ib_umad_reg_agent2(file: filp->private_data, arg: compat_ptr(uptr: arg));
973	default:
974	return -ENOIOCTLCMD;
975	}
976	}
977	#endif
978
979	/*
980	* ib_umad_open() does not need the BKL:
981	*
982	* - the ib_umad_port structures are properly reference counted, and
983	* everything else is purely local to the file being created, so
984	* races against other open calls are not a problem;
985	* - the ioctl method does not affect any global state outside of the
986	* file structure being operated on;
987	*/
988	static int ib_umad_open(struct inode *inode, struct file *filp)
989	{
990	struct ib_umad_port *port;
991	struct ib_umad_file *file;
992	int ret = 0;
993
994	port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
995
996	mutex_lock(&port->file_mutex);
997
998	if (!port->ib_dev) {
999	ret = -ENXIO;
1000	goto out;
1001	}
1002
1003	if (!rdma_dev_access_netns(device: port->ib_dev, current->nsproxy->net_ns)) {
1004	ret = -EPERM;
1005	goto out;
1006	}
1007
1008	file = kzalloc(size: sizeof(*file), GFP_KERNEL);
1009	if (!file) {
1010	ret = -ENOMEM;
1011	goto out;
1012	}
1013
1014	mutex_init(&file->mutex);
1015	spin_lock_init(&file->send_lock);
1016	INIT_LIST_HEAD(list: &file->recv_list);
1017	INIT_LIST_HEAD(list: &file->send_list);
1018	init_waitqueue_head(&file->recv_wait);
1019
1020	file->port = port;
1021	filp->private_data = file;
1022
1023	list_add_tail(new: &file->port_list, head: &port->file_list);
1024
1025	stream_open(inode, filp);
1026	out:
1027	mutex_unlock(lock: &port->file_mutex);
1028	return ret;
1029	}
1030
1031	static int ib_umad_close(struct inode *inode, struct file *filp)
1032	{
1033	struct ib_umad_file *file = filp->private_data;
1034	struct ib_umad_packet *packet, *tmp;
1035	int already_dead;
1036	int i;
1037
1038	mutex_lock(&file->port->file_mutex);
1039	mutex_lock(&file->mutex);
1040
1041	already_dead = file->agents_dead;
1042	file->agents_dead = 1;
1043
1044	list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
1045	if (packet->recv_wc)
1046	ib_free_recv_mad(mad_recv_wc: packet->recv_wc);
1047	kfree(objp: packet);
1048	}
1049
1050	list_del(entry: &file->port_list);
1051
1052	mutex_unlock(lock: &file->mutex);
1053
1054	if (!already_dead)
1055	for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1056	if (file->agent[i])
1057	ib_unregister_mad_agent(mad_agent: file->agent[i]);
1058
1059	mutex_unlock(lock: &file->port->file_mutex);
1060	mutex_destroy(lock: &file->mutex);
1061	kfree(objp: file);
1062	return 0;
1063	}
1064
1065	static const struct file_operations umad_fops = {
1066	.owner = THIS_MODULE,
1067	.read = ib_umad_read,
1068	.write = ib_umad_write,
1069	.poll = ib_umad_poll,
1070	.unlocked_ioctl = ib_umad_ioctl,
1071	#ifdef CONFIG_COMPAT
1072	.compat_ioctl = ib_umad_compat_ioctl,
1073	#endif
1074	.open = ib_umad_open,
1075	.release = ib_umad_close,
1076	.llseek = no_llseek,
1077	};
1078
1079	static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1080	{
1081	struct ib_umad_port *port;
1082	struct ib_port_modify props = {
1083	.set_port_cap_mask = IB_PORT_SM
1084	};
1085	int ret;
1086
1087	port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1088
1089	if (filp->f_flags & O_NONBLOCK) {
1090	if (down_trylock(sem: &port->sm_sem)) {
1091	ret = -EAGAIN;
1092	goto fail;
1093	}
1094	} else {
1095	if (down_interruptible(sem: &port->sm_sem)) {
1096	ret = -ERESTARTSYS;
1097	goto fail;
1098	}
1099	}
1100
1101	if (!rdma_dev_access_netns(device: port->ib_dev, current->nsproxy->net_ns)) {
1102	ret = -EPERM;
1103	goto err_up_sem;
1104	}
1105
1106	ret = ib_modify_port(device: port->ib_dev, port_num: port->port_num, port_modify_mask: 0, port_modify: &props);
1107	if (ret)
1108	goto err_up_sem;
1109
1110	filp->private_data = port;
1111
1112	nonseekable_open(inode, filp);
1113	return 0;
1114
1115	err_up_sem:
1116	up(sem: &port->sm_sem);
1117
1118	fail:
1119	return ret;
1120	}
1121
1122	static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1123	{
1124	struct ib_umad_port *port = filp->private_data;
1125	struct ib_port_modify props = {
1126	.clr_port_cap_mask = IB_PORT_SM
1127	};
1128	int ret = 0;
1129
1130	mutex_lock(&port->file_mutex);
1131	if (port->ib_dev)
1132	ret = ib_modify_port(device: port->ib_dev, port_num: port->port_num, port_modify_mask: 0, port_modify: &props);
1133	mutex_unlock(lock: &port->file_mutex);
1134
1135	up(sem: &port->sm_sem);
1136
1137	return ret;
1138	}
1139
1140	static const struct file_operations umad_sm_fops = {
1141	.owner = THIS_MODULE,
1142	.open = ib_umad_sm_open,
1143	.release = ib_umad_sm_close,
1144	.llseek = no_llseek,
1145	};
1146
1147	static struct ib_umad_port *get_port(struct ib_device *ibdev,
1148	struct ib_umad_device *umad_dev,
1149	u32 port)
1150	{
1151	if (!umad_dev)
1152	return ERR_PTR(error: -EOPNOTSUPP);
1153	if (!rdma_is_port_valid(device: ibdev, port))
1154	return ERR_PTR(error: -EINVAL);
1155	if (!rdma_cap_ib_mad(device: ibdev, port_num: port))
1156	return ERR_PTR(error: -EOPNOTSUPP);
1157
1158	return &umad_dev->ports[port - rdma_start_port(device: ibdev)];
1159	}
1160
1161	static int ib_umad_get_nl_info(struct ib_device *ibdev, void *client_data,
1162	struct ib_client_nl_info *res)
1163	{
1164	struct ib_umad_port *port = get_port(ibdev, umad_dev: client_data, port: res->port);
1165
1166	if (IS_ERR(ptr: port))
1167	return PTR_ERR(ptr: port);
1168
1169	res->abi = IB_USER_MAD_ABI_VERSION;
1170	res->cdev = &port->dev;
1171	return 0;
1172	}
1173
1174	static struct ib_client umad_client = {
1175	.name = "umad",
1176	.add = ib_umad_add_one,
1177	.remove = ib_umad_remove_one,
1178	.get_nl_info = ib_umad_get_nl_info,
1179	};
1180	MODULE_ALIAS_RDMA_CLIENT("umad");
1181
1182	static int ib_issm_get_nl_info(struct ib_device *ibdev, void *client_data,
1183	struct ib_client_nl_info *res)
1184	{
1185	struct ib_umad_port *port = get_port(ibdev, umad_dev: client_data, port: res->port);
1186
1187	if (IS_ERR(ptr: port))
1188	return PTR_ERR(ptr: port);
1189
1190	res->abi = IB_USER_MAD_ABI_VERSION;
1191	res->cdev = &port->sm_dev;
1192	return 0;
1193	}
1194
1195	static struct ib_client issm_client = {
1196	.name = "issm",
1197	.get_nl_info = ib_issm_get_nl_info,
1198	};
1199	MODULE_ALIAS_RDMA_CLIENT("issm");
1200
1201	static ssize_t ibdev_show(struct device *dev, struct device_attribute *attr,
1202	char *buf)
1203	{
1204	struct ib_umad_port *port = dev_get_drvdata(dev);
1205
1206	if (!port)
1207	return -ENODEV;
1208
1209	return sysfs_emit(buf, fmt: "%s\n", dev_name(dev: &port->ib_dev->dev));
1210	}
1211	static DEVICE_ATTR_RO(ibdev);
1212
1213	static ssize_t port_show(struct device *dev, struct device_attribute *attr,
1214	char *buf)
1215	{
1216	struct ib_umad_port *port = dev_get_drvdata(dev);
1217
1218	if (!port)
1219	return -ENODEV;
1220
1221	return sysfs_emit(buf, fmt: "%d\n", port->port_num);
1222	}
1223	static DEVICE_ATTR_RO(port);
1224
1225	static struct attribute *umad_class_dev_attrs[] = {
1226	&dev_attr_ibdev.attr,
1227	&dev_attr_port.attr,
1228	NULL,
1229	};
1230	ATTRIBUTE_GROUPS(umad_class_dev);
1231
1232	static char *umad_devnode(const struct device *dev, umode_t *mode)
1233	{
1234	return kasprintf(GFP_KERNEL, fmt: "infiniband/%s", dev_name(dev));
1235	}
1236
1237	static ssize_t abi_version_show(const struct class *class,
1238	const struct class_attribute *attr, char *buf)
1239	{
1240	return sysfs_emit(buf, fmt: "%d\n", IB_USER_MAD_ABI_VERSION);
1241	}
1242	static CLASS_ATTR_RO(abi_version);
1243
1244	static struct attribute *umad_class_attrs[] = {
1245	&class_attr_abi_version.attr,
1246	NULL,
1247	};
1248	ATTRIBUTE_GROUPS(umad_class);
1249
1250	static struct class umad_class = {
1251	.name = "infiniband_mad",
1252	.devnode = umad_devnode,
1253	.class_groups = umad_class_groups,
1254	.dev_groups = umad_class_dev_groups,
1255	};
1256
1257	static void ib_umad_release_port(struct device *device)
1258	{
1259	struct ib_umad_port *port = dev_get_drvdata(dev: device);
1260	struct ib_umad_device *umad_dev = port->umad_dev;
1261
1262	ib_umad_dev_put(dev: umad_dev);
1263	}
1264
1265	static void ib_umad_init_port_dev(struct device *dev,
1266	struct ib_umad_port *port,
1267	const struct ib_device *device)
1268	{
1269	device_initialize(dev);
1270	ib_umad_dev_get(dev: port->umad_dev);
1271	dev->class = &umad_class;
1272	dev->parent = device->dev.parent;
1273	dev_set_drvdata(dev, data: port);
1274	dev->release = ib_umad_release_port;
1275	}
1276
1277	static int ib_umad_init_port(struct ib_device *device, int port_num,
1278	struct ib_umad_device *umad_dev,
1279	struct ib_umad_port *port)
1280	{
1281	int devnum;
1282	dev_t base_umad;
1283	dev_t base_issm;
1284	int ret;
1285
1286	devnum = ida_alloc_max(ida: &umad_ida, max: IB_UMAD_MAX_PORTS - 1, GFP_KERNEL);
1287	if (devnum < 0)
1288	return -1;
1289	port->dev_num = devnum;
1290	if (devnum >= IB_UMAD_NUM_FIXED_MINOR) {
1291	base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1292	base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1293	} else {
1294	base_umad = devnum + base_umad_dev;
1295	base_issm = devnum + base_issm_dev;
1296	}
1297
1298	port->ib_dev = device;
1299	port->umad_dev = umad_dev;
1300	port->port_num = port_num;
1301	sema_init(sem: &port->sm_sem, val: 1);
1302	mutex_init(&port->file_mutex);
1303	INIT_LIST_HEAD(list: &port->file_list);
1304
1305	ib_umad_init_port_dev(dev: &port->dev, port, device);
1306	port->dev.devt = base_umad;
1307	dev_set_name(dev: &port->dev, name: "umad%d", port->dev_num);
1308	cdev_init(&port->cdev, &umad_fops);
1309	port->cdev.owner = THIS_MODULE;
1310
1311	ret = cdev_device_add(cdev: &port->cdev, dev: &port->dev);
1312	if (ret)
1313	goto err_cdev;
1314
1315	ib_umad_init_port_dev(dev: &port->sm_dev, port, device);
1316	port->sm_dev.devt = base_issm;
1317	dev_set_name(dev: &port->sm_dev, name: "issm%d", port->dev_num);
1318	cdev_init(&port->sm_cdev, &umad_sm_fops);
1319	port->sm_cdev.owner = THIS_MODULE;
1320
1321	ret = cdev_device_add(cdev: &port->sm_cdev, dev: &port->sm_dev);
1322	if (ret)
1323	goto err_dev;
1324
1325	return 0;
1326
1327	err_dev:
1328	put_device(dev: &port->sm_dev);
1329	cdev_device_del(cdev: &port->cdev, dev: &port->dev);
1330	err_cdev:
1331	put_device(dev: &port->dev);
1332	ida_free(&umad_ida, id: devnum);
1333	return ret;
1334	}
1335
1336	static void ib_umad_kill_port(struct ib_umad_port *port)
1337	{
1338	struct ib_umad_file *file;
1339	int id;
1340
1341	cdev_device_del(cdev: &port->sm_cdev, dev: &port->sm_dev);
1342	cdev_device_del(cdev: &port->cdev, dev: &port->dev);
1343
1344	mutex_lock(&port->file_mutex);
1345
1346	/* Mark ib_dev NULL and block ioctl or other file ops to progress
1347	* further.
1348	*/
1349	port->ib_dev = NULL;
1350
1351	list_for_each_entry(file, &port->file_list, port_list) {
1352	mutex_lock(&file->mutex);
1353	file->agents_dead = 1;
1354	wake_up_interruptible(&file->recv_wait);
1355	mutex_unlock(lock: &file->mutex);
1356
1357	for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1358	if (file->agent[id])
1359	ib_unregister_mad_agent(mad_agent: file->agent[id]);
1360	}
1361
1362	mutex_unlock(lock: &port->file_mutex);
1363
1364	ida_free(&umad_ida, id: port->dev_num);
1365
1366	/* balances device_initialize() */
1367	put_device(dev: &port->sm_dev);
1368	put_device(dev: &port->dev);
1369	}
1370
1371	static int ib_umad_add_one(struct ib_device *device)
1372	{
1373	struct ib_umad_device *umad_dev;
1374	int s, e, i;
1375	int count = 0;
1376	int ret;
1377
1378	s = rdma_start_port(device);
1379	e = rdma_end_port(device);
1380
1381	umad_dev = kzalloc(struct_size(umad_dev, ports,
1382	size_add(size_sub(e, s), 1)),
1383	GFP_KERNEL);
1384	if (!umad_dev)
1385	return -ENOMEM;
1386
1387	kref_init(kref: &umad_dev->kref);
1388	for (i = s; i <= e; ++i) {
1389	if (!rdma_cap_ib_mad(device, port_num: i))
1390	continue;
1391
1392	ret = ib_umad_init_port(device, port_num: i, umad_dev,
1393	port: &umad_dev->ports[i - s]);
1394	if (ret)
1395	goto err;
1396
1397	count++;
1398	}
1399
1400	if (!count) {
1401	ret = -EOPNOTSUPP;
1402	goto free;
1403	}
1404
1405	ib_set_client_data(device, client: &umad_client, data: umad_dev);
1406
1407	return 0;
1408
1409	err:
1410	while (--i >= s) {
1411	if (!rdma_cap_ib_mad(device, port_num: i))
1412	continue;
1413
1414	ib_umad_kill_port(port: &umad_dev->ports[i - s]);
1415	}
1416	free:
1417	/* balances kref_init */
1418	ib_umad_dev_put(dev: umad_dev);
1419	return ret;
1420	}
1421
1422	static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1423	{
1424	struct ib_umad_device *umad_dev = client_data;
1425	unsigned int i;
1426
1427	rdma_for_each_port (device, i) {
1428	if (rdma_cap_ib_mad(device, port_num: i))
1429	ib_umad_kill_port(
1430	port: &umad_dev->ports[i - rdma_start_port(device)]);
1431	}
1432	/* balances kref_init() */
1433	ib_umad_dev_put(dev: umad_dev);
1434	}
1435
1436	static int __init ib_umad_init(void)
1437	{
1438	int ret;
1439
1440	ret = register_chrdev_region(base_umad_dev,
1441	IB_UMAD_NUM_FIXED_MINOR * 2,
1442	umad_class.name);
1443	if (ret) {
1444	pr_err("couldn't register device number\n");
1445	goto out;
1446	}
1447
1448	ret = alloc_chrdev_region(&dynamic_umad_dev, 0,
1449	IB_UMAD_NUM_DYNAMIC_MINOR * 2,
1450	umad_class.name);
1451	if (ret) {
1452	pr_err("couldn't register dynamic device number\n");
1453	goto out_alloc;
1454	}
1455	dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR;
1456
1457	ret = class_register(class: &umad_class);
1458	if (ret) {
1459	pr_err("couldn't create class infiniband_mad\n");
1460	goto out_chrdev;
1461	}
1462
1463	ret = ib_register_client(client: &umad_client);
1464	if (ret)
1465	goto out_class;
1466
1467	ret = ib_register_client(client: &issm_client);
1468	if (ret)
1469	goto out_client;
1470
1471	return 0;
1472
1473	out_client:
1474	ib_unregister_client(client: &umad_client);
1475	out_class:
1476	class_unregister(class: &umad_class);
1477
1478	out_chrdev:
1479	unregister_chrdev_region(dynamic_umad_dev,
1480	IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1481
1482	out_alloc:
1483	unregister_chrdev_region(base_umad_dev,
1484	IB_UMAD_NUM_FIXED_MINOR * 2);
1485
1486	out:
1487	return ret;
1488	}
1489
1490	static void __exit ib_umad_cleanup(void)
1491	{
1492	ib_unregister_client(client: &issm_client);
1493	ib_unregister_client(client: &umad_client);
1494	class_unregister(class: &umad_class);
1495	unregister_chrdev_region(base_umad_dev,
1496	IB_UMAD_NUM_FIXED_MINOR * 2);
1497	unregister_chrdev_region(dynamic_umad_dev,
1498	IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1499	}
1500
1501	module_init(ib_umad_init);
1502	module_exit(ib_umad_cleanup);
1503