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/err.h>
  36 #include <linux/seq_file.h>
  37
  38 struct file_operations;
  39
  40 #include <linux/debugfs.h>
  41
  42 #include "ipoib.h"
  43
  44 static struct dentry *ipoib_root;
  45
  46 static void *ipoib_mcg_seq_start(struct seq_file *file, loff_t *pos)
  47 {
  48         struct ipoib_mcast_iter *iter;
  49         loff_t n = *pos;
  50
  51         iter = ipoib_mcast_iter_init(file->private);
  52         if (!iter)
  53                 return NULL;
  54
  55         while (n--) {
  56                 if (ipoib_mcast_iter_next(iter)) {
  57                         ipoib_mcast_iter_free(iter);
  58                         return NULL;
  59                 }
  60         }
  61
  62         return iter;
  63 }
  64
  65 static void *ipoib_mcg_seq_next(struct seq_file *file, void *iter_ptr,
  66                                    loff_t *pos)
  67 {
  68         struct ipoib_mcast_iter *iter = iter_ptr;
  69
  70         (*pos)++;
  71
  72         if (ipoib_mcast_iter_next(iter)) {
  73                 ipoib_mcast_iter_free(iter);
  74                 return NULL;
  75         }
  76
  77         return iter;
  78 }
  79
  80 static void ipoib_mcg_seq_stop(struct seq_file *file, void *iter_ptr)
  81 {
  82         /* nothing for now */
  83 }
  84
  85 static int ipoib_mcg_seq_show(struct seq_file *file, void *iter_ptr)
  86 {
  87         struct ipoib_mcast_iter *iter = iter_ptr;
  88         char gid_buf[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"];
  89         union ib_gid mgid;
  90         int i, n;
  91         unsigned long created;
  92         unsigned int queuelen, complete, send_only;
  93
  94         if (iter) {
  95                 ipoib_mcast_iter_read(iter, &mgid, &created, &queuelen,
  96                                       &complete, &send_only);
  97
  98                 for (n = 0, i = 0; i < sizeof mgid / 2; ++i) {
  99                         n += sprintf(gid_buf + n, "%x",
 100                                      be16_to_cpu(((u16 *)mgid.raw)[i]));
 101                         if (i < sizeof mgid / 2 - 1)
 102                                 gid_buf[n++] = ':';
 103                 }
 104         }
 105
 106         seq_printf(file, "GID: %*s", -(1 + (int) sizeof gid_buf), gid_buf);
 107
 108         seq_printf(file,
 109                    " created: %10ld queuelen: %4d complete: %d send_only: %d\n",
 110                    created, queuelen, complete, send_only);
 111
 112         return 0;
 113 }
 114
 115 static struct seq_operations ipoib_seq_ops = {
 116         .start = ipoib_mcg_seq_start,
 117         .next  = ipoib_mcg_seq_next,
 118         .stop  = ipoib_mcg_seq_stop,
 119         .show  = ipoib_mcg_seq_show,
 120 };
 121
 122 static int ipoib_mcg_open(struct inode *inode, struct file *file)
 123 {
 124         struct seq_file *seq;
 125         int ret;
 126
 127         ret = seq_open(file, &ipoib_seq_ops);
 128         if (ret)
 129                 return ret;
 130
 131         seq = file->private_data;
 132         seq->private = inode->u.generic_ip;
 133
 134         return 0;
 135 }
 136
 137 static struct file_operations ipoib_fops = {
 138         .owner   = THIS_MODULE,
 139         .open    = ipoib_mcg_open,
 140         .read    = seq_read,
 141         .llseek  = seq_lseek,
 142         .release = seq_release
 143 };
 144
 145 int ipoib_create_debug_file(struct net_device *dev)
 146 {
 147         struct ipoib_dev_priv *priv = netdev_priv(dev);
 148         char name[IFNAMSIZ + sizeof "_mcg"];
 149
 150         snprintf(name, sizeof name, "%s_mcg", dev->name);
 151
 152         priv->mcg_dentry = debugfs_create_file(name, S_IFREG | S_IRUGO,
 153                                                ipoib_root, dev, &ipoib_fops);
 154
 155         return priv->mcg_dentry ? 0 : -ENOMEM;
 156 }
 157
 158 void ipoib_delete_debug_file(struct net_device *dev)
 159 {
 160         struct ipoib_dev_priv *priv = netdev_priv(dev);
 161
 162         if (priv->mcg_dentry)
 163                 debugfs_remove(priv->mcg_dentry);
 164 }
 165
 166 int ipoib_register_debugfs(void)
 167 {
 168         ipoib_root = debugfs_create_dir("ipoib", NULL);
 169         return ipoib_root ? 0 : -ENOMEM;
 170 }
 171
 172 void ipoib_unregister_debugfs(void)
 173 {
 174         debugfs_remove(ipoib_root);
 175 }