net/hsr/hsr_debugfs.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * debugfs code for HSR & PRP
0004  * Copyright (C) 2019 Texas Instruments Incorporated
0005  *
0006  * Author(s):
0007  *  Murali Karicheri <m-karicheri2@ti.com>
0008  */
0009 #include <linux/module.h>
0010 #include <linux/errno.h>
0011 #include <linux/debugfs.h>
0012 #include <linux/jhash.h>
0013 #include "hsr_main.h"
0014 #include "hsr_framereg.h"
0015
0016 static struct dentry *hsr_debugfs_root_dir;
0017
0018 /* hsr_node_table_show - Formats and prints node_table entries */
0019 static int
0020 hsr_node_table_show(struct seq_file *sfp, void *data)
0021 {
0022     struct hsr_priv *priv = (struct hsr_priv *)sfp->private;
0023     struct hsr_node *node;
0024     int i;
0025
0026     seq_printf(sfp, "Node Table entries for (%s) device\n",
0027            (priv->prot_version == PRP_V1 ? "PRP" : "HSR"));
0028     seq_puts(sfp, "MAC-Address-A,    MAC-Address-B,    time_in[A], ");
0029     seq_puts(sfp, "time_in[B], Address-B port, ");
0030     if (priv->prot_version == PRP_V1)
0031         seq_puts(sfp, "SAN-A, SAN-B, DAN-P\n");
0032     else
0033         seq_puts(sfp, "DAN-H\n");
0034
0035     rcu_read_lock();
0036
0037     for (i = 0 ; i < priv->hash_buckets; i++) {
0038         hlist_for_each_entry_rcu(node, &priv->node_db[i], mac_list) {
0039             /* skip self node */
0040             if (hsr_addr_is_self(priv, node->macaddress_A))
0041                 continue;
0042             seq_printf(sfp, "%pM ", &node->macaddress_A[0]);
0043             seq_printf(sfp, "%pM ", &node->macaddress_B[0]);
0044             seq_printf(sfp, "%10lx, ",
0045                    node->time_in[HSR_PT_SLAVE_A]);
0046             seq_printf(sfp, "%10lx, ",
0047                    node->time_in[HSR_PT_SLAVE_B]);
0048             seq_printf(sfp, "%14x, ", node->addr_B_port);
0049
0050             if (priv->prot_version == PRP_V1)
0051                 seq_printf(sfp, "%5x, %5x, %5x\n",
0052                        node->san_a, node->san_b,
0053                        (node->san_a == 0 &&
0054                         node->san_b == 0));
0055             else
0056                 seq_printf(sfp, "%5x\n", 1);
0057         }
0058     }
0059     rcu_read_unlock();
0060     return 0;
0061 }
0062
0063 DEFINE_SHOW_ATTRIBUTE(hsr_node_table);
0064
0065 void hsr_debugfs_rename(struct net_device *dev)
0066 {
0067     struct hsr_priv *priv = netdev_priv(dev);
0068     struct dentry *d;
0069
0070     d = debugfs_rename(hsr_debugfs_root_dir, priv->node_tbl_root,
0071                hsr_debugfs_root_dir, dev->name);
0072     if (IS_ERR(d))
0073         netdev_warn(dev, "failed to rename\n");
0074     else
0075         priv->node_tbl_root = d;
0076 }
0077
0078 /* hsr_debugfs_init - create hsr node_table file for dumping
0079  * the node table
0080  *
0081  * Description:
0082  * When debugfs is configured this routine sets up the node_table file per
0083  * hsr device for dumping the node_table entries
0084  */
0085 void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev)
0086 {
0087     struct dentry *de = NULL;
0088
0089     de = debugfs_create_dir(hsr_dev->name, hsr_debugfs_root_dir);
0090     if (IS_ERR(de)) {
0091         pr_err("Cannot create hsr debugfs directory\n");
0092         return;
0093     }
0094
0095     priv->node_tbl_root = de;
0096
0097     de = debugfs_create_file("node_table", S_IFREG | 0444,
0098                  priv->node_tbl_root, priv,
0099                  &hsr_node_table_fops);
0100     if (IS_ERR(de)) {
0101         pr_err("Cannot create hsr node_table file\n");
0102         debugfs_remove(priv->node_tbl_root);
0103         priv->node_tbl_root = NULL;
0104         return;
0105     }
0106 }
0107
0108 /* hsr_debugfs_term - Tear down debugfs intrastructure
0109  *
0110  * Description:
0111  * When Debugfs is configured this routine removes debugfs file system
0112  * elements that are specific to hsr
0113  */
0114 void
0115 hsr_debugfs_term(struct hsr_priv *priv)
0116 {
0117     debugfs_remove_recursive(priv->node_tbl_root);
0118     priv->node_tbl_root = NULL;
0119 }
0120
0121 void hsr_debugfs_create_root(void)
0122 {
0123     hsr_debugfs_root_dir = debugfs_create_dir("hsr", NULL);
0124     if (IS_ERR(hsr_debugfs_root_dir)) {
0125         pr_err("Cannot create hsr debugfs root directory\n");
0126         hsr_debugfs_root_dir = NULL;
0127     }
0128 }
0129
0130 void hsr_debugfs_remove_root(void)
0131 {
0132     /* debugfs_remove() internally checks NULL and ERROR */
0133     debugfs_remove(hsr_debugfs_root_dir);
0134 }