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 
33 #include <linux/err.h>
34 #include <linux/seq_file.h>
35 #include <linux/slab.h>
36 
37 struct file_operations;
38 
39 #include <linux/debugfs.h>
40 #include <linux/export.h>
41 
42 #include "ipoib.h"
43 
44 static struct dentry *ipoib_root;
45 
46 static void format_gid(union ib_gid *gid, char *buf)
47 {
48 	int i, n;
49 
50 	for (n = 0, i = 0; i < 8; ++i) {
51 		n += sprintf(buf + n, "%x",
52 			     be16_to_cpu(((__be16 *) gid->raw)[i]));
53 		if (i < 7)
54 			buf[n++] = ':';
55 	}
56 }
57 
58 static void *ipoib_mcg_seq_start(struct seq_file *file, loff_t *pos)
59 {
60 	struct ipoib_mcast_iter *iter;
61 	loff_t n = *pos;
62 
63 	iter = ipoib_mcast_iter_init(file->private);
64 	if (!iter)
65 		return NULL;
66 
67 	while (n--) {
68 		if (ipoib_mcast_iter_next(iter)) {
69 			kfree(iter);
70 			return NULL;
71 		}
72 	}
73 
74 	return iter;
75 }
76 
77 static void *ipoib_mcg_seq_next(struct seq_file *file, void *iter_ptr,
78 				   loff_t *pos)
79 {
80 	struct ipoib_mcast_iter *iter = iter_ptr;
81 
82 	(*pos)++;
83 
84 	if (ipoib_mcast_iter_next(iter)) {
85 		kfree(iter);
86 		return NULL;
87 	}
88 
89 	return iter;
90 }
91 
92 static void ipoib_mcg_seq_stop(struct seq_file *file, void *iter_ptr)
93 {
94 	/* nothing for now */
95 }
96 
97 static int ipoib_mcg_seq_show(struct seq_file *file, void *iter_ptr)
98 {
99 	struct ipoib_mcast_iter *iter = iter_ptr;
100 	char gid_buf[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"];
101 	union ib_gid mgid;
102 	unsigned long created;
103 	unsigned int queuelen, complete, send_only;
104 
105 	if (!iter)
106 		return 0;
107 
108 	ipoib_mcast_iter_read(iter, &mgid, &created, &queuelen,
109 			      &complete, &send_only);
110 
111 	format_gid(&mgid, gid_buf);
112 
113 	seq_printf(file,
114 		   "GID: %s\n"
115 		   "  created: %10ld\n"
116 		   "  queuelen: %9d\n"
117 		   "  complete: %9s\n"
118 		   "  send_only: %8s\n"
119 		   "\n",
120 		   gid_buf, created, queuelen,
121 		   complete ? "yes" : "no",
122 		   send_only ? "yes" : "no");
123 
124 	return 0;
125 }
126 
127 static const struct seq_operations ipoib_mcg_seq_ops = {
128 	.start = ipoib_mcg_seq_start,
129 	.next  = ipoib_mcg_seq_next,
130 	.stop  = ipoib_mcg_seq_stop,
131 	.show  = ipoib_mcg_seq_show,
132 };
133 
134 static int ipoib_mcg_open(struct inode *inode, struct file *file)
135 {
136 	struct seq_file *seq;
137 	int ret;
138 
139 	ret = seq_open(file, &ipoib_mcg_seq_ops);
140 	if (ret)
141 		return ret;
142 
143 	seq = file->private_data;
144 	seq->private = inode->i_private;
145 
146 	return 0;
147 }
148 
149 static const struct file_operations ipoib_mcg_fops = {
150 	.owner   = THIS_MODULE,
151 	.open    = ipoib_mcg_open,
152 	.read    = seq_read,
153 	.llseek  = seq_lseek,
154 	.release = seq_release
155 };
156 
157 static void *ipoib_path_seq_start(struct seq_file *file, loff_t *pos)
158 {
159 	struct ipoib_path_iter *iter;
160 	loff_t n = *pos;
161 
162 	iter = ipoib_path_iter_init(file->private);
163 	if (!iter)
164 		return NULL;
165 
166 	while (n--) {
167 		if (ipoib_path_iter_next(iter)) {
168 			kfree(iter);
169 			return NULL;
170 		}
171 	}
172 
173 	return iter;
174 }
175 
176 static void *ipoib_path_seq_next(struct seq_file *file, void *iter_ptr,
177 				   loff_t *pos)
178 {
179 	struct ipoib_path_iter *iter = iter_ptr;
180 
181 	(*pos)++;
182 
183 	if (ipoib_path_iter_next(iter)) {
184 		kfree(iter);
185 		return NULL;
186 	}
187 
188 	return iter;
189 }
190 
191 static void ipoib_path_seq_stop(struct seq_file *file, void *iter_ptr)
192 {
193 	/* nothing for now */
194 }
195 
196 static int ipoib_path_seq_show(struct seq_file *file, void *iter_ptr)
197 {
198 	struct ipoib_path_iter *iter = iter_ptr;
199 	char gid_buf[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"];
200 	struct ipoib_path path;
201 	int rate;
202 
203 	if (!iter)
204 		return 0;
205 
206 	ipoib_path_iter_read(iter, &path);
207 
208 	format_gid(&path.pathrec.dgid, gid_buf);
209 
210 	seq_printf(file,
211 		   "GID: %s\n"
212 		   "  complete: %6s\n",
213 		   gid_buf, sa_path_get_dlid(&path.pathrec) ? "yes" : "no");
214 
215 	if (sa_path_get_dlid(&path.pathrec)) {
216 		rate = ib_rate_to_mbps(path.pathrec.rate);
217 
218 		seq_printf(file,
219 			   "  DLID:     0x%04x\n"
220 			   "  SL: %12d\n"
221 			   "  rate: %8d.%d Gb/sec\n",
222 			   be32_to_cpu(sa_path_get_dlid(&path.pathrec)),
223 			   path.pathrec.sl,
224 			   rate / 1000, rate % 1000);
225 	}
226 
227 	seq_putc(file, '\n');
228 
229 	return 0;
230 }
231 
232 static const struct seq_operations ipoib_path_seq_ops = {
233 	.start = ipoib_path_seq_start,
234 	.next  = ipoib_path_seq_next,
235 	.stop  = ipoib_path_seq_stop,
236 	.show  = ipoib_path_seq_show,
237 };
238 
239 static int ipoib_path_open(struct inode *inode, struct file *file)
240 {
241 	struct seq_file *seq;
242 	int ret;
243 
244 	ret = seq_open(file, &ipoib_path_seq_ops);
245 	if (ret)
246 		return ret;
247 
248 	seq = file->private_data;
249 	seq->private = inode->i_private;
250 
251 	return 0;
252 }
253 
254 static const struct file_operations ipoib_path_fops = {
255 	.owner   = THIS_MODULE,
256 	.open    = ipoib_path_open,
257 	.read    = seq_read,
258 	.llseek  = seq_lseek,
259 	.release = seq_release
260 };
261 
262 void ipoib_create_debug_files(struct net_device *dev)
263 {
264 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
265 	char name[IFNAMSIZ + sizeof "_path"];
266 
267 	snprintf(name, sizeof name, "%s_mcg", dev->name);
268 	priv->mcg_dentry = debugfs_create_file(name, S_IFREG | S_IRUGO,
269 					       ipoib_root, dev, &ipoib_mcg_fops);
270 	if (!priv->mcg_dentry)
271 		ipoib_warn(priv, "failed to create mcg debug file\n");
272 
273 	snprintf(name, sizeof name, "%s_path", dev->name);
274 	priv->path_dentry = debugfs_create_file(name, S_IFREG | S_IRUGO,
275 						ipoib_root, dev, &ipoib_path_fops);
276 	if (!priv->path_dentry)
277 		ipoib_warn(priv, "failed to create path debug file\n");
278 }
279 
280 void ipoib_delete_debug_files(struct net_device *dev)
281 {
282 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
283 
284 	WARN_ONCE(!priv->mcg_dentry, "null mcg debug file\n");
285 	WARN_ONCE(!priv->path_dentry, "null path debug file\n");
286 	debugfs_remove(priv->mcg_dentry);
287 	debugfs_remove(priv->path_dentry);
288 	priv->mcg_dentry = priv->path_dentry = NULL;
289 }
290 
291 int ipoib_register_debugfs(void)
292 {
293 	ipoib_root = debugfs_create_dir("ipoib", NULL);
294 	return ipoib_root ? 0 : -ENOMEM;
295 }
296 
297 void ipoib_unregister_debugfs(void)
298 {
299 	debugfs_remove(ipoib_root);
300 }
301