LXR linux/drivers/infiniband/hw/usnic/usnic

   1/*
   2 * Copyright (c) 2013, Cisco Systems, Inc. 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 * 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
  34#include <linux/debugfs.h>
  35#include <linux/module.h>
  36
  37#include "usnic.h"
  38#include "usnic_log.h"
  39#include "usnic_debugfs.h"
  40#include "usnic_ib_qp_grp.h"
  41#include "usnic_transport.h"
  42
  43static struct dentry *debugfs_root;
  44static struct dentry *flows_dentry;
  45
  46static ssize_t usnic_debugfs_buildinfo_read(struct file *f, char __user *data,
  47                                                size_t count, loff_t *ppos)
  48{
  49        char buf[500];
  50        int res;
  51
  52        if (*ppos > 0)
  53                return 0;
  54
  55        res = scnprintf(buf, sizeof(buf),
  56                        "version:       %s\n"
  57                        "build date:    %s\n",
  58                        DRV_VERSION, DRV_RELDATE);
  59
  60        return simple_read_from_buffer(data, count, ppos, buf, res);
  61}
  62
  63static const struct file_operations usnic_debugfs_buildinfo_ops = {
  64        .owner = THIS_MODULE,
  65        .open = simple_open,
  66        .read = usnic_debugfs_buildinfo_read
  67};
  68
  69static ssize_t flowinfo_read(struct file *f, char __user *data,
  70                                size_t count, loff_t *ppos)
  71{
  72        struct usnic_ib_qp_grp_flow *qp_flow;
  73        int n;
  74        int left;
  75        char *ptr;
  76        char buf[512];
  77
  78        qp_flow = f->private_data;
  79        ptr = buf;
  80        left = count;
  81
  82        if (*ppos > 0)
  83                return 0;
  84
  85        spin_lock(&qp_flow->qp_grp->lock);
  86        n = scnprintf(ptr, left,
  87                        "QP Grp ID: %d Transport: %s ",
  88                        qp_flow->qp_grp->grp_id,
  89                        usnic_transport_to_str(qp_flow->trans_type));
  90        UPDATE_PTR_LEFT(n, ptr, left);
  91        if (qp_flow->trans_type == USNIC_TRANSPORT_ROCE_CUSTOM) {
  92                n = scnprintf(ptr, left, "Port_Num:%hu\n",
  93                                        qp_flow->usnic_roce.port_num);
  94                UPDATE_PTR_LEFT(n, ptr, left);
  95        } else if (qp_flow->trans_type == USNIC_TRANSPORT_IPV4_UDP) {
  96                n = usnic_transport_sock_to_str(ptr, left,
  97                                qp_flow->udp.sock);
  98                UPDATE_PTR_LEFT(n, ptr, left);
  99                n = scnprintf(ptr, left, "\n");
 100                UPDATE_PTR_LEFT(n, ptr, left);
 101        }
 102        spin_unlock(&qp_flow->qp_grp->lock);
 103
 104        return simple_read_from_buffer(data, count, ppos, buf, ptr - buf);
 105}
 106
 107static const struct file_operations flowinfo_ops = {
 108        .owner = THIS_MODULE,
 109        .open = simple_open,
 110        .read = flowinfo_read,
 111};
 112
 113void usnic_debugfs_init(void)
 114{
 115        debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
 116        if (IS_ERR(debugfs_root)) {
 117                usnic_err("Failed to create debugfs root dir, check if debugfs is enabled in kernel configuration\n");
 118                goto out_clear_root;
 119        }
 120
 121        flows_dentry = debugfs_create_dir("flows", debugfs_root);
 122        if (IS_ERR_OR_NULL(flows_dentry)) {
 123                usnic_err("Failed to create debugfs flow dir with err %ld\n",
 124                                PTR_ERR(flows_dentry));
 125                goto out_free_root;
 126        }
 127
 128        debugfs_create_file("build-info", S_IRUGO, debugfs_root,
 129                                NULL, &usnic_debugfs_buildinfo_ops);
 130        return;
 131
 132out_free_root:
 133        debugfs_remove_recursive(debugfs_root);
 134out_clear_root:
 135        debugfs_root = NULL;
 136}
 137
 138void usnic_debugfs_exit(void)
 139{
 140        if (!debugfs_root)
 141                return;
 142
 143        debugfs_remove_recursive(debugfs_root);
 144        debugfs_root = NULL;
 145}
 146
 147void usnic_debugfs_flow_add(struct usnic_ib_qp_grp_flow *qp_flow)
 148{
 149        if (IS_ERR_OR_NULL(flows_dentry))
 150                return;
 151
 152        scnprintf(qp_flow->dentry_name, sizeof(qp_flow->dentry_name),
 153                        "%u", qp_flow->flow->flow_id);
 154        qp_flow->dbgfs_dentry = debugfs_create_file(qp_flow->dentry_name,
 155                                                        S_IRUGO,
 156                                                        flows_dentry,
 157                                                        qp_flow,
 158                                                        &flowinfo_ops);
 159        if (IS_ERR_OR_NULL(qp_flow->dbgfs_dentry)) {
 160                usnic_err("Failed to create dbg fs entry for flow %u with error %ld\n",
 161                                qp_flow->flow->flow_id,
 162                                PTR_ERR(qp_flow->dbgfs_dentry));
 163        }
 164}
 165
 166void usnic_debugfs_flow_remove(struct usnic_ib_qp_grp_flow *qp_flow)
 167{
 168        if (!IS_ERR_OR_NULL(qp_flow->dbgfs_dentry))
 169                debugfs_remove(qp_flow->dbgfs_dentry);
 170}
 171