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Linux/net/hsr/hsr_debugfs.c

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  1 /*
  2  * hsr_debugfs code
  3  * Copyright (C) 2019 Texas Instruments Incorporated
  4  *
  5  * Author(s):
  6  *      Murali Karicheri <m-karicheri2@ti.com>
  7  *
  8  * This program is free software; you can redistribute it and/or
  9  * modify it under the terms of the GNU General Public License as
 10  * published by the Free Software Foundation version 2.
 11  *
 12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 13  * kind, whether express or implied; without even the implied warranty
 14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  */
 17 #include <linux/module.h>
 18 #include <linux/errno.h>
 19 #include <linux/debugfs.h>
 20 #include "hsr_main.h"
 21 #include "hsr_framereg.h"
 22 
 23 static void print_mac_address(struct seq_file *sfp, unsigned char *mac)
 24 {
 25         seq_printf(sfp, "%02x:%02x:%02x:%02x:%02x:%02x:",
 26                    mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
 27 }
 28 
 29 /* hsr_node_table_show - Formats and prints node_table entries */
 30 static int
 31 hsr_node_table_show(struct seq_file *sfp, void *data)
 32 {
 33         struct hsr_priv *priv = (struct hsr_priv *)sfp->private;
 34         struct hsr_node *node;
 35 
 36         seq_puts(sfp, "Node Table entries\n");
 37         seq_puts(sfp, "MAC-Address-A,   MAC-Address-B, time_in[A], ");
 38         seq_puts(sfp, "time_in[B], Address-B port\n");
 39         rcu_read_lock();
 40         list_for_each_entry_rcu(node, &priv->node_db, mac_list) {
 41                 /* skip self node */
 42                 if (hsr_addr_is_self(priv, node->macaddress_A))
 43                         continue;
 44                 print_mac_address(sfp, &node->macaddress_A[0]);
 45                 seq_puts(sfp, " ");
 46                 print_mac_address(sfp, &node->macaddress_B[0]);
 47                 seq_printf(sfp, "0x%lx, ", node->time_in[HSR_PT_SLAVE_A]);
 48                 seq_printf(sfp, "0x%lx ", node->time_in[HSR_PT_SLAVE_B]);
 49                 seq_printf(sfp, "0x%x\n", node->addr_B_port);
 50         }
 51         rcu_read_unlock();
 52         return 0;
 53 }
 54 
 55 /* hsr_node_table_open - Open the node_table file
 56  *
 57  * Description:
 58  * This routine opens a debugfs file node_table of specific hsr device
 59  */
 60 static int
 61 hsr_node_table_open(struct inode *inode, struct file *filp)
 62 {
 63         return single_open(filp, hsr_node_table_show, inode->i_private);
 64 }
 65 
 66 static const struct file_operations hsr_fops = {
 67         .owner  = THIS_MODULE,
 68         .open   = hsr_node_table_open,
 69         .read   = seq_read,
 70         .llseek = seq_lseek,
 71         .release = single_release,
 72 };
 73 
 74 /* hsr_debugfs_init - create hsr node_table file for dumping
 75  * the node table
 76  *
 77  * Description:
 78  * When debugfs is configured this routine sets up the node_table file per
 79  * hsr device for dumping the node_table entries
 80  */
 81 int hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev)
 82 {
 83         int rc = -1;
 84         struct dentry *de = NULL;
 85 
 86         de = debugfs_create_dir(hsr_dev->name, NULL);
 87         if (!de) {
 88                 pr_err("Cannot create hsr debugfs root\n");
 89                 return rc;
 90         }
 91 
 92         priv->node_tbl_root = de;
 93 
 94         de = debugfs_create_file("node_table", S_IFREG | 0444,
 95                                  priv->node_tbl_root, priv,
 96                                  &hsr_fops);
 97         if (!de) {
 98                 pr_err("Cannot create hsr node_table directory\n");
 99                 return rc;
100         }
101         priv->node_tbl_file = de;
102 
103         return 0;
104 }
105 
106 /* hsr_debugfs_term - Tear down debugfs intrastructure
107  *
108  * Description:
109  * When Debufs is configured this routine removes debugfs file system
110  * elements that are specific to hsr
111  */
112 void
113 hsr_debugfs_term(struct hsr_priv *priv)
114 {
115         debugfs_remove(priv->node_tbl_file);
116         priv->node_tbl_file = NULL;
117         debugfs_remove(priv->node_tbl_root);
118         priv->node_tbl_root = NULL;
119 }
120 

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