drivers/infiniband/hw/usnic/usnic_debugfs.c

   1 /*
   2  * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
   3  *
   4  * This program is free software; you may redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15  * SOFTWARE.
  16  *
  17  */
  18
  19 #include <linux/debugfs.h>
  20 #include <linux/module.h>
  21
  22 #include "usnic.h"
  23 #include "usnic_log.h"
  24 #include "usnic_debugfs.h"
  25 #include "usnic_ib_qp_grp.h"
  26 #include "usnic_transport.h"
  27
  28 static struct dentry *debugfs_root;
  29 static struct dentry *flows_dentry;
  30
  31 static ssize_t usnic_debugfs_buildinfo_read(struct file *f, char __user *data,
  32                                                 size_t count, loff_t *ppos)
  33 {
  34         char buf[500];
  35         int res;
  36
  37         if (*ppos > 0)
  38                 return 0;
  39
  40         res = scnprintf(buf, sizeof(buf),
  41                         "version:       %s\n"
  42                         "build date:    %s\n",
  43                         DRV_VERSION, DRV_RELDATE);
  44
  45         return simple_read_from_buffer(data, count, ppos, buf, res);
  46 }
  47
  48 static const struct file_operations usnic_debugfs_buildinfo_ops = {
  49         .owner = THIS_MODULE,
  50         .open = simple_open,
  51         .read = usnic_debugfs_buildinfo_read
  52 };
  53
  54 static ssize_t flowinfo_read(struct file *f, char __user *data,
  55                                 size_t count, loff_t *ppos)
  56 {
  57         struct usnic_ib_qp_grp_flow *qp_flow;
  58         int n;
  59         int left;
  60         char *ptr;
  61         char buf[512];
  62
  63         qp_flow = f->private_data;
  64         ptr = buf;
  65         left = count;
  66
  67         if (*ppos > 0)
  68                 return 0;
  69
  70         spin_lock(&qp_flow->qp_grp->lock);
  71         n = scnprintf(ptr, left,
  72                         "QP Grp ID: %d Transport: %s ",
  73                         qp_flow->qp_grp->grp_id,
  74                         usnic_transport_to_str(qp_flow->trans_type));
  75         UPDATE_PTR_LEFT(n, ptr, left);
  76         if (qp_flow->trans_type == USNIC_TRANSPORT_ROCE_CUSTOM) {
  77                 n = scnprintf(ptr, left, "Port_Num:%hu\n",
  78                                         qp_flow->usnic_roce.port_num);
  79                 UPDATE_PTR_LEFT(n, ptr, left);
  80         } else if (qp_flow->trans_type == USNIC_TRANSPORT_IPV4_UDP) {
  81                 n = usnic_transport_sock_to_str(ptr, left,
  82                                 qp_flow->udp.sock);
  83                 UPDATE_PTR_LEFT(n, ptr, left);
  84                 n = scnprintf(ptr, left, "\n");
  85                 UPDATE_PTR_LEFT(n, ptr, left);
  86         }
  87         spin_unlock(&qp_flow->qp_grp->lock);
  88
  89         return simple_read_from_buffer(data, count, ppos, buf, ptr - buf);
  90 }
  91
  92 static const struct file_operations flowinfo_ops = {
  93         .owner = THIS_MODULE,
  94         .open = simple_open,
  95         .read = flowinfo_read,
  96 };
  97
  98 void usnic_debugfs_init(void)
  99 {
 100         debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
 101         if (IS_ERR(debugfs_root)) {
 102                 usnic_err("Failed to create debugfs root dir, check if debugfs is enabled in kernel configuration\n");
 103                 goto out_clear_root;
 104         }
 105
 106         flows_dentry = debugfs_create_dir("flows", debugfs_root);
 107         if (IS_ERR_OR_NULL(flows_dentry)) {
 108                 usnic_err("Failed to create debugfs flow dir with err %ld\n",
 109                                 PTR_ERR(flows_dentry));
 110                 goto out_free_root;
 111         }
 112
 113         debugfs_create_file("build-info", S_IRUGO, debugfs_root,
 114                                 NULL, &usnic_debugfs_buildinfo_ops);
 115         return;
 116
 117 out_free_root:
 118         debugfs_remove_recursive(debugfs_root);
 119 out_clear_root:
 120         debugfs_root = NULL;
 121 }
 122
 123 void usnic_debugfs_exit(void)
 124 {
 125         if (!debugfs_root)
 126                 return;
 127
 128         debugfs_remove_recursive(debugfs_root);
 129         debugfs_root = NULL;
 130 }
 131
 132 void usnic_debugfs_flow_add(struct usnic_ib_qp_grp_flow *qp_flow)
 133 {
 134         if (IS_ERR_OR_NULL(flows_dentry))
 135                 return;
 136
 137         scnprintf(qp_flow->dentry_name, sizeof(qp_flow->dentry_name),
 138                         "%u", qp_flow->flow->flow_id);
 139         qp_flow->dbgfs_dentry = debugfs_create_file(qp_flow->dentry_name,
 140                                                         S_IRUGO,
 141                                                         flows_dentry,
 142                                                         qp_flow,
 143                                                         &flowinfo_ops);
 144         if (IS_ERR_OR_NULL(qp_flow->dbgfs_dentry)) {
 145                 usnic_err("Failed to create dbg fs entry for flow %u\n",
 146                                 qp_flow->flow->flow_id);
 147         }
 148 }
 149
 150 void usnic_debugfs_flow_remove(struct usnic_ib_qp_grp_flow *qp_flow)
 151 {
 152         if (!IS_ERR_OR_NULL(qp_flow->dbgfs_dentry))
 153                 debugfs_remove(qp_flow->dbgfs_dentry);
 154 }