drivers/infiniband/hw/usnic/usnic_debugfs.c

   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
  43 static struct dentry *debugfs_root;
  44 static struct dentry *flows_dentry;
  45
  46 static 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
  63 static const struct file_operations usnic_debugfs_buildinfo_ops = {
  64         .owner = THIS_MODULE,
  65         .open = simple_open,
  66         .read = usnic_debugfs_buildinfo_read
  67 };
  68
  69 static 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
 107 static const struct file_operations flowinfo_ops = {
 108         .owner = THIS_MODULE,
 109         .open = simple_open,
 110         .read = flowinfo_read,
 111 };
 112
 113 void 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
 132 out_free_root:
 133         debugfs_remove_recursive(debugfs_root);
 134 out_clear_root:
 135         debugfs_root = NULL;
 136 }
 137
 138 void usnic_debugfs_exit(void)
 139 {
 140         if (!debugfs_root)
 141                 return;
 142
 143         debugfs_remove_recursive(debugfs_root);
 144         debugfs_root = NULL;
 145 }
 146
 147 void 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
 166 void 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 }