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ipoib_fs.c

/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: ipoib_fs.c 1389 2004-12-27 22:56:47Z roland $
 */

#include <linux/err.h>
#include <linux/seq_file.h>

struct file_operations;

#include <linux/debugfs.h>

#include "ipoib.h"

static struct dentry *ipoib_root;

static void format_gid(union ib_gid *gid, char *buf)
{
      int i, n;

      for (n = 0, i = 0; i < 8; ++i) {
            n += sprintf(buf + n, "%x",
                       be16_to_cpu(((__be16 *) gid->raw)[i]));
            if (i < 7)
                  buf[n++] = ':';
      }
}

static void *ipoib_mcg_seq_start(struct seq_file *file, loff_t *pos)
{
      struct ipoib_mcast_iter *iter;
      loff_t n = *pos;

      iter = ipoib_mcast_iter_init(file->private);
      if (!iter)
            return NULL;

      while (n--) {
            if (ipoib_mcast_iter_next(iter)) {
                  kfree(iter);
                  return NULL;
            }
      }

      return iter;
}

static void *ipoib_mcg_seq_next(struct seq_file *file, void *iter_ptr,
                           loff_t *pos)
{
      struct ipoib_mcast_iter *iter = iter_ptr;

      (*pos)++;

      if (ipoib_mcast_iter_next(iter)) {
            kfree(iter);
            return NULL;
      }

      return iter;
}

static void ipoib_mcg_seq_stop(struct seq_file *file, void *iter_ptr)
{
      /* nothing for now */
}

static int ipoib_mcg_seq_show(struct seq_file *file, void *iter_ptr)
{
      struct ipoib_mcast_iter *iter = iter_ptr;
      char gid_buf[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"];
      union ib_gid mgid;
      unsigned long created;
      unsigned int queuelen, complete, send_only;

      if (!iter)
            return 0;

      ipoib_mcast_iter_read(iter, &mgid, &created, &queuelen,
                        &complete, &send_only);

      format_gid(&mgid, gid_buf);

      seq_printf(file,
               "GID: %s\n"
               "  created: %10ld\n"
               "  queuelen: %9d\n"
               "  complete: %9s\n"
               "  send_only: %8s\n"
               "\n",
               gid_buf, created, queuelen,
               complete ? "yes" : "no",
               send_only ? "yes" : "no");

      return 0;
}

static struct seq_operations ipoib_mcg_seq_ops = {
      .start = ipoib_mcg_seq_start,
      .next  = ipoib_mcg_seq_next,
      .stop  = ipoib_mcg_seq_stop,
      .show  = ipoib_mcg_seq_show,
};

static int ipoib_mcg_open(struct inode *inode, struct file *file)
{
      struct seq_file *seq;
      int ret;

      ret = seq_open(file, &ipoib_mcg_seq_ops);
      if (ret)
            return ret;

      seq = file->private_data;
      seq->private = inode->i_private;

      return 0;
}

static const struct file_operations ipoib_mcg_fops = {
      .owner   = THIS_MODULE,
      .open    = ipoib_mcg_open,
      .read    = seq_read,
      .llseek  = seq_lseek,
      .release = seq_release
};

static void *ipoib_path_seq_start(struct seq_file *file, loff_t *pos)
{
      struct ipoib_path_iter *iter;
      loff_t n = *pos;

      iter = ipoib_path_iter_init(file->private);
      if (!iter)
            return NULL;

      while (n--) {
            if (ipoib_path_iter_next(iter)) {
                  kfree(iter);
                  return NULL;
            }
      }

      return iter;
}

static void *ipoib_path_seq_next(struct seq_file *file, void *iter_ptr,
                           loff_t *pos)
{
      struct ipoib_path_iter *iter = iter_ptr;

      (*pos)++;

      if (ipoib_path_iter_next(iter)) {
            kfree(iter);
            return NULL;
      }

      return iter;
}

static void ipoib_path_seq_stop(struct seq_file *file, void *iter_ptr)
{
      /* nothing for now */
}

static int ipoib_path_seq_show(struct seq_file *file, void *iter_ptr)
{
      struct ipoib_path_iter *iter = iter_ptr;
      char gid_buf[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"];
      struct ipoib_path path;
      int rate;

      if (!iter)
            return 0;

      ipoib_path_iter_read(iter, &path);

      format_gid(&path.pathrec.dgid, gid_buf);

      seq_printf(file,
               "GID: %s\n"
               "  complete: %6s\n",
               gid_buf, path.pathrec.dlid ? "yes" : "no");

      if (path.pathrec.dlid) {
            rate = ib_rate_to_mult(path.pathrec.rate) * 25;

            seq_printf(file,
                     "  DLID:     0x%04x\n"
                     "  SL: %12d\n"
                     "  rate: %*d%s Gb/sec\n",
                     be16_to_cpu(path.pathrec.dlid),
                     path.pathrec.sl,
                     10 - ((rate % 10) ? 2 : 0),
                     rate / 10, rate % 10 ? ".5" : "");
      }

      seq_putc(file, '\n');

      return 0;
}

static struct seq_operations ipoib_path_seq_ops = {
      .start = ipoib_path_seq_start,
      .next  = ipoib_path_seq_next,
      .stop  = ipoib_path_seq_stop,
      .show  = ipoib_path_seq_show,
};

static int ipoib_path_open(struct inode *inode, struct file *file)
{
      struct seq_file *seq;
      int ret;

      ret = seq_open(file, &ipoib_path_seq_ops);
      if (ret)
            return ret;

      seq = file->private_data;
      seq->private = inode->i_private;

      return 0;
}

static const struct file_operations ipoib_path_fops = {
      .owner   = THIS_MODULE,
      .open    = ipoib_path_open,
      .read    = seq_read,
      .llseek  = seq_lseek,
      .release = seq_release
};

void ipoib_create_debug_files(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      char name[IFNAMSIZ + sizeof "_path"];

      snprintf(name, sizeof name, "%s_mcg", dev->name);
      priv->mcg_dentry = debugfs_create_file(name, S_IFREG | S_IRUGO,
                                     ipoib_root, dev, &ipoib_mcg_fops);
      if (!priv->mcg_dentry)
            ipoib_warn(priv, "failed to create mcg debug file\n");

      snprintf(name, sizeof name, "%s_path", dev->name);
      priv->path_dentry = debugfs_create_file(name, S_IFREG | S_IRUGO,
                                    ipoib_root, dev, &ipoib_path_fops);
      if (!priv->path_dentry)
            ipoib_warn(priv, "failed to create path debug file\n");
}

void ipoib_delete_debug_files(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);

      if (priv->mcg_dentry)
            debugfs_remove(priv->mcg_dentry);
      if (priv->path_dentry)
            debugfs_remove(priv->path_dentry);
}

int ipoib_register_debugfs(void)
{
      ipoib_root = debugfs_create_dir("ipoib", NULL);
      return ipoib_root ? 0 : -ENOMEM;
}

void ipoib_unregister_debugfs(void)
{
      debugfs_remove(ipoib_root);
}

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