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 
41 #include "ipoib.h"
42 
43 static struct dentry *ipoib_root;
44 
45 static void format_gid(union ib_gid *gid, char *buf)
46 {
47 	int i, n;
48 
49 	for (n = 0, i = 0; i < 8; ++i) {
50 		n += sprintf(buf + n, "%x",
51 			     be16_to_cpu(((__be16 *) gid->raw)[i]));
52 		if (i < 7)
53 			buf[n++] = ':';
54 	}
55 }
56 
57 static void *ipoib_mcg_seq_start(struct seq_file *file, loff_t *pos)
58 {
59 	struct ipoib_mcast_iter *iter;
60 	loff_t n = *pos;
61 
62 	iter = ipoib_mcast_iter_init(file->private);
63 	if (!iter)
64 		return NULL;
65 
66 	while (n--) {
67 		if (ipoib_mcast_iter_next(iter)) {
68 			kfree(iter);
69 			return NULL;
70 		}
71 	}
72 
73 	return iter;
74 }
75 
76 static void *ipoib_mcg_seq_next(struct seq_file *file, void *iter_ptr,
77 				   loff_t *pos)
78 {
79 	struct ipoib_mcast_iter *iter = iter_ptr;
80 
81 	(*pos)++;
82 
83 	if (ipoib_mcast_iter_next(iter)) {
84 		kfree(iter);
85 		return NULL;
86 	}
87 
88 	return iter;
89 }
90 
91 static void ipoib_mcg_seq_stop(struct seq_file *file, void *iter_ptr)
92 {
93 	/* nothing for now */
94 }
95 
96 static int ipoib_mcg_seq_show(struct seq_file *file, void *iter_ptr)
97 {
98 	struct ipoib_mcast_iter *iter = iter_ptr;
99 	char gid_buf[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"];
100 	union ib_gid mgid;
101 	unsigned long created;
102 	unsigned int queuelen, complete, send_only;
103 
104 	if (!iter)
105 		return 0;
106 
107 	ipoib_mcast_iter_read(iter, &mgid, &created, &queuelen,
108 			      &complete, &send_only);
109 
110 	format_gid(&mgid, gid_buf);
111 
112 	seq_printf(file,
113 		   "GID: %s\n"
114 		   "  created: %10ld\n"
115 		   "  queuelen: %9d\n"
116 		   "  complete: %9s\n"
117 		   "  send_only: %8s\n"
118 		   "\n",
119 		   gid_buf, created, queuelen,
120 		   complete ? "yes" : "no",
121 		   send_only ? "yes" : "no");
122 
123 	return 0;
124 }
125 
126 static const struct seq_operations ipoib_mcg_seq_ops = {
127 	.start = ipoib_mcg_seq_start,
128 	.next  = ipoib_mcg_seq_next,
129 	.stop  = ipoib_mcg_seq_stop,
130 	.show  = ipoib_mcg_seq_show,
131 };
132 
133 static int ipoib_mcg_open(struct inode *inode, struct file *file)
134 {
135 	struct seq_file *seq;
136 	int ret;
137 
138 	ret = seq_open(file, &ipoib_mcg_seq_ops);
139 	if (ret)
140 		return ret;
141 
142 	seq = file->private_data;
143 	seq->private = inode->i_private;
144 
145 	return 0;
146 }
147 
148 static const struct file_operations ipoib_mcg_fops = {
149 	.owner   = THIS_MODULE,
150 	.open    = ipoib_mcg_open,
151 	.read    = seq_read,
152 	.llseek  = seq_lseek,
153 	.release = seq_release
154 };
155 
156 static void *ipoib_path_seq_start(struct seq_file *file, loff_t *pos)
157 {
158 	struct ipoib_path_iter *iter;
159 	loff_t n = *pos;
160 
161 	iter = ipoib_path_iter_init(file->private);
162 	if (!iter)
163 		return NULL;
164 
165 	while (n--) {
166 		if (ipoib_path_iter_next(iter)) {
167 			kfree(iter);
168 			return NULL;
169 		}
170 	}
171 
172 	return iter;
173 }
174 
175 static void *ipoib_path_seq_next(struct seq_file *file, void *iter_ptr,
176 				   loff_t *pos)
177 {
178 	struct ipoib_path_iter *iter = iter_ptr;
179 
180 	(*pos)++;
181 
182 	if (ipoib_path_iter_next(iter)) {
183 		kfree(iter);
184 		return NULL;
185 	}
186 
187 	return iter;
188 }
189 
190 static void ipoib_path_seq_stop(struct seq_file *file, void *iter_ptr)
191 {
192 	/* nothing for now */
193 }
194 
195 static int ipoib_path_seq_show(struct seq_file *file, void *iter_ptr)
196 {
197 	struct ipoib_path_iter *iter = iter_ptr;
198 	char gid_buf[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"];
199 	struct ipoib_path path;
200 	int rate;
201 
202 	if (!iter)
203 		return 0;
204 
205 	ipoib_path_iter_read(iter, &path);
206 
207 	format_gid(&path.pathrec.dgid, gid_buf);
208 
209 	seq_printf(file,
210 		   "GID: %s\n"
211 		   "  complete: %6s\n",
212 		   gid_buf, path.pathrec.dlid ? "yes" : "no");
213 
214 	if (path.pathrec.dlid) {
215 		rate = ib_rate_to_mult(path.pathrec.rate) * 25;
216 
217 		seq_printf(file,
218 			   "  DLID:     0x%04x\n"
219 			   "  SL: %12d\n"
220 			   "  rate: %*d%s Gb/sec\n",
221 			   be16_to_cpu(path.pathrec.dlid),
222 			   path.pathrec.sl,
223 			   10 - ((rate % 10) ? 2 : 0),
224 			   rate / 10, rate % 10 ? ".5" : "");
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 = netdev_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 = netdev_priv(dev);
283 
284 	if (priv->mcg_dentry)
285 		debugfs_remove(priv->mcg_dentry);
286 	if (priv->path_dentry)
287 		debugfs_remove(priv->path_dentry);
288 }
289 
290 int ipoib_register_debugfs(void)
291 {
292 	ipoib_root = debugfs_create_dir("ipoib", NULL);
293 	return ipoib_root ? 0 : -ENOMEM;
294 }
295 
296 void ipoib_unregister_debugfs(void)
297 {
298 	debugfs_remove(ipoib_root);
299 }
300