/*-
 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
 *
 * 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.
 */

#include <sys/cdefs.h>
#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 const 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 const 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(if_t dev)
{
        struct ipoib_dev_priv *priv = dev->if_softc;
        char name[IFNAMSIZ + sizeof "_path"];

        snprintf(name, sizeof name, "%s_mcg", if_name(dev));
        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", if_name(dev));
        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(if_t dev)
{
        struct ipoib_dev_priv *priv = dev->if_softc;

        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);
}