/drivers/infiniband/ulp/ipoib/ipoib_fs.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: ipoib_fs.c 1389 2004-12-27 22:56:47Z roland $
 33 */
 34
 35#include <linux/pagemap.h>
 36#include <linux/seq_file.h>
 37
 38#include "ipoib.h"
 39
 40enum {
 41	IPOIB_MAGIC = 0x49504942 /* "IPIB" */
 42};
 43
 44static DECLARE_MUTEX(ipoib_fs_mutex);
 45static struct dentry *ipoib_root;
 46static struct super_block *ipoib_sb;
 47static LIST_HEAD(ipoib_device_list);
 48
 49static void *ipoib_mcg_seq_start(struct seq_file *file, loff_t *pos)
 50{
 51	struct ipoib_mcast_iter *iter;
 52	loff_t n = *pos;
 53
 54	iter = ipoib_mcast_iter_init(file->private);
 55	if (!iter)
 56		return NULL;
 57
 58	while (n--) {
 59		if (ipoib_mcast_iter_next(iter)) {
 60			ipoib_mcast_iter_free(iter);
 61			return NULL;
 62		}
 63	}
 64
 65	return iter;
 66}
 67
 68static void *ipoib_mcg_seq_next(struct seq_file *file, void *iter_ptr,
 69				   loff_t *pos)
 70{
 71	struct ipoib_mcast_iter *iter = iter_ptr;
 72
 73	(*pos)++;
 74
 75	if (ipoib_mcast_iter_next(iter)) {
 76		ipoib_mcast_iter_free(iter);
 77		return NULL;
 78	}
 79
 80	return iter;
 81}
 82
 83static void ipoib_mcg_seq_stop(struct seq_file *file, void *iter_ptr)
 84{
 85	/* nothing for now */
 86}
 87
 88static int ipoib_mcg_seq_show(struct seq_file *file, void *iter_ptr)
 89{
 90	struct ipoib_mcast_iter *iter = iter_ptr;
 91	char gid_buf[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"];
 92	union ib_gid mgid;
 93	int i, n;
 94	unsigned long created;
 95	unsigned int queuelen, complete, send_only;
 96
 97	if (iter) {
 98		ipoib_mcast_iter_read(iter, &mgid, &created, &queuelen,
 99				      &complete, &send_only);
100
101		for (n = 0, i = 0; i < sizeof mgid / 2; ++i) {
102			n += sprintf(gid_buf + n, "%x",
103				     be16_to_cpu(((u16 *)mgid.raw)[i]));
104			if (i < sizeof mgid / 2 - 1)
105				gid_buf[n++] = ':';
106		}
107	}
108
109	seq_printf(file, "GID: %*s", -(1 + (int) sizeof gid_buf), gid_buf);
110
111	seq_printf(file,
112		   " created: %10ld queuelen: %4d complete: %d send_only: %d\n",
113		   created, queuelen, complete, send_only);
114
115	return 0;
116}
117
118static struct seq_operations ipoib_seq_ops = {
119	.start = ipoib_mcg_seq_start,
120	.next  = ipoib_mcg_seq_next,
121	.stop  = ipoib_mcg_seq_stop,
122	.show  = ipoib_mcg_seq_show,
123};
124
125static int ipoib_mcg_open(struct inode *inode, struct file *file)
126{
127	struct seq_file *seq;
128	int ret;
129
130	ret = seq_open(file, &ipoib_seq_ops);
131	if (ret)
132		return ret;
133
134	seq = file->private_data;
135	seq->private = inode->u.generic_ip;
136
137	return 0;
138}
139
140static struct file_operations ipoib_fops = {
141	.owner   = THIS_MODULE,
142	.open    = ipoib_mcg_open,
143	.read    = seq_read,
144	.llseek  = seq_lseek,
145	.release = seq_release
146};
147
148static struct inode *ipoib_get_inode(void)
149{
150	struct inode *inode = new_inode(ipoib_sb);
151
152	if (inode) {
153		inode->i_mode 	 = S_IFREG | S_IRUGO;
154		inode->i_uid 	 = 0;
155		inode->i_gid 	 = 0;
156		inode->i_blksize = PAGE_CACHE_SIZE;
157		inode->i_blocks  = 0;
158		inode->i_atime 	 = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
159		inode->i_fop     = &ipoib_fops;
160	}
161
162	return inode;
163}
164
165static int __ipoib_create_debug_file(struct net_device *dev)
166{
167	struct ipoib_dev_priv *priv = netdev_priv(dev);
168	struct dentry *dentry;
169	struct inode *inode;
170	char name[IFNAMSIZ + sizeof "_mcg"];
171
172	snprintf(name, sizeof name, "%s_mcg", dev->name);
173
174	dentry = d_alloc_name(ipoib_root, name);
175	if (!dentry)
176		return -ENOMEM;
177
178	inode = ipoib_get_inode();
179	if (!inode) {
180		dput(dentry);
181		return -ENOMEM;
182	}
183
184	inode->u.generic_ip = dev;
185	priv->mcg_dentry = dentry;
186
187	d_add(dentry, inode);
188
189	return 0;
190}
191
192int ipoib_create_debug_file(struct net_device *dev)
193{
194	struct ipoib_dev_priv *priv = netdev_priv(dev);
195
196	down(&ipoib_fs_mutex);
197
198	list_add_tail(&priv->fs_list, &ipoib_device_list);
199
200	if (!ipoib_sb) {
201		up(&ipoib_fs_mutex);
202		return 0;
203	}
204
205	up(&ipoib_fs_mutex);
206
207	return __ipoib_create_debug_file(dev);
208}
209
210void ipoib_delete_debug_file(struct net_device *dev)
211{
212	struct ipoib_dev_priv *priv = netdev_priv(dev);
213
214	down(&ipoib_fs_mutex);
215	list_del(&priv->fs_list);
216	if (!ipoib_sb) {
217		up(&ipoib_fs_mutex);
218		return;
219	}
220	up(&ipoib_fs_mutex);
221
222	if (priv->mcg_dentry) {
223		d_drop(priv->mcg_dentry);
224		simple_unlink(ipoib_root->d_inode, priv->mcg_dentry);
225	}
226}
227
228static int ipoib_fill_super(struct super_block *sb, void *data, int silent)
229{
230	static struct tree_descr ipoib_files[] = {
231		{ "" }
232	};
233	struct ipoib_dev_priv *priv;
234	int ret;
235
236	ret = simple_fill_super(sb, IPOIB_MAGIC, ipoib_files);
237	if (ret)
238		return ret;
239
240	ipoib_root = sb->s_root;
241
242	down(&ipoib_fs_mutex);
243
244	ipoib_sb = sb;
245
246	list_for_each_entry(priv, &ipoib_device_list, fs_list) {
247		ret = __ipoib_create_debug_file(priv->dev);
248		if (ret)
249			break;
250	}
251
252	up(&ipoib_fs_mutex);
253
254	return ret;
255}
256
257static struct super_block *ipoib_get_sb(struct file_system_type *fs_type,
258	int flags, const char *dev_name, void *data)
259{
260	return get_sb_single(fs_type, flags, data, ipoib_fill_super);
261}
262
263static void ipoib_kill_sb(struct super_block *sb)
264{
265	down(&ipoib_fs_mutex);
266	ipoib_sb = NULL;
267	up(&ipoib_fs_mutex);
268
269	kill_litter_super(sb);
270}
271
272static struct file_system_type ipoib_fs_type = {
273	.owner		= THIS_MODULE,
274	.name		= "ipoib_debugfs",
275	.get_sb		= ipoib_get_sb,
276	.kill_sb	= ipoib_kill_sb,
277};
278
279int ipoib_register_debugfs(void)
280{
281	return register_filesystem(&ipoib_fs_type);
282}
283
284void ipoib_unregister_debugfs(void)
285{
286	unregister_filesystem(&ipoib_fs_type);
287}