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Subject[PATCH net 13/14] net: hsr: add debugfs support for display node list
Date
This adds a debugfs interface to allow display the nodes learned
by the hsr master.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
---
net/hsr/Makefile | 1 +
net/hsr/hsr_device.c | 5 ++
net/hsr/hsr_framereg.c | 12 ----
net/hsr/hsr_framereg.h | 12 ++++
net/hsr/hsr_main.h | 17 ++++++
net/hsr/hsr_prp_debugfs.c | 120 ++++++++++++++++++++++++++++++++++++++
6 files changed, 155 insertions(+), 12 deletions(-)
create mode 100644 net/hsr/hsr_prp_debugfs.c

diff --git a/net/hsr/Makefile b/net/hsr/Makefile
index 9ae972a820f4..d74d89d013b0 100644
--- a/net/hsr/Makefile
+++ b/net/hsr/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_HSR) += hsr.o

hsr-y := hsr_main.o hsr_framereg.o hsr_device.o \
hsr_netlink.o hsr_slave.o hsr_forward.o
+hsr-$(CONFIG_DEBUG_FS) += hsr_prp_debugfs.o
diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
index bb7bf2002040..b47a621e3f4e 100644
--- a/net/hsr/hsr_device.c
+++ b/net/hsr/hsr_device.c
@@ -354,6 +354,8 @@ static void hsr_dev_destroy(struct net_device *hsr_dev)

hsr = netdev_priv(hsr_dev);

+ hsr_prp_debugfs_term(hsr);
+
rtnl_lock();
hsr_for_each_port(hsr, port)
hsr_del_port(port);
@@ -483,6 +485,9 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
goto fail;

mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD));
+ res = hsr_prp_debugfs_init(hsr);
+ if (res)
+ goto fail;

return 0;

diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c
index 22203562821f..a3cc30ac8a5a 100644
--- a/net/hsr/hsr_framereg.c
+++ b/net/hsr/hsr_framereg.c
@@ -18,18 +18,6 @@
#include "hsr_framereg.h"
#include "hsr_netlink.h"

-struct hsr_node {
- struct list_head mac_list;
- unsigned char macaddress_A[ETH_ALEN];
- unsigned char macaddress_B[ETH_ALEN];
- /* Local slave through which AddrB frames are received from this node */
- enum hsr_port_type addr_B_port;
- unsigned long time_in[HSR_PT_PORTS];
- bool time_in_stale[HSR_PT_PORTS];
- u16 seq_out[HSR_PT_PORTS];
- struct rcu_head rcu_head;
-};
-
/* TODO: use hash lists for mac addresses (linux/jhash.h)? */

/* seq_nr_after(a, b) - return true if a is after (higher in sequence than) b,
diff --git a/net/hsr/hsr_framereg.h b/net/hsr/hsr_framereg.h
index 5f515d4cd088..a3bdcdab469d 100644
--- a/net/hsr/hsr_framereg.h
+++ b/net/hsr/hsr_framereg.h
@@ -48,4 +48,16 @@ int hsr_get_node_data(struct hsr_priv *hsr,
int *if2_age,
u16 *if2_seq);

+struct hsr_node {
+ struct list_head mac_list;
+ unsigned char macaddress_A[ETH_ALEN];
+ unsigned char macaddress_B[ETH_ALEN];
+ /* Local slave through which AddrB frames are received from this node */
+ enum hsr_port_type addr_B_port;
+ unsigned long time_in[HSR_PT_PORTS];
+ bool time_in_stale[HSR_PT_PORTS];
+ u16 seq_out[HSR_PT_PORTS];
+ struct rcu_head rcu_head;
+};
+
#endif /* __HSR_FRAMEREG_H */
diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h
index 1e49675ca186..778213f07fe0 100644
--- a/net/hsr/hsr_main.h
+++ b/net/hsr/hsr_main.h
@@ -163,6 +163,10 @@ struct hsr_priv {
u8 prot_version; /* Indicate if HSRv0 or HSRv1. */
spinlock_t seqnr_lock; /* locking for sequence_nr */
unsigned char sup_multicast_addr[ETH_ALEN];
+#ifdef CONFIG_DEBUG_FS
+ struct dentry *node_tbl_root;
+ struct dentry *node_tbl_file;
+#endif
};

#define hsr_for_each_port(hsr, port) \
@@ -179,4 +183,17 @@ static inline u16 hsr_get_skb_sequence_nr(struct sk_buff *skb)
return ntohs(hsr_ethhdr->hsr_tag.sequence_nr);
}

+#if IS_ENABLED(CONFIG_DEBUG_FS)
+int hsr_prp_debugfs_init(struct hsr_priv *priv);
+void hsr_prp_debugfs_term(struct hsr_priv *priv);
+#else
+static inline int hsr_prp_debugfs_init(struct hsr_priv *priv)
+{
+ return 0;
+}
+
+static inline void hsr_prp_debugfs_term(struct hsr_priv *priv)
+{}
+#endif
+
#endif /* __HSR_PRIVATE_H */
diff --git a/net/hsr/hsr_prp_debugfs.c b/net/hsr/hsr_prp_debugfs.c
new file mode 100644
index 000000000000..b30e98734c61
--- /dev/null
+++ b/net/hsr/hsr_prp_debugfs.c
@@ -0,0 +1,120 @@
+/*
+ * hsr_prp_debugfs code
+ * Copyright (C) 2017 Texas Instruments Incorporated
+ *
+ * Author(s):
+ * Murali Karicheri <m-karicheri2@ti.com?
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/debugfs.h>
+#include "hsr_main.h"
+#include "hsr_framereg.h"
+
+static void print_mac_address(struct seq_file *sfp, unsigned char *mac)
+{
+ seq_printf(sfp, "%02x:%02x:%02x:%02x:%02x:%02x:",
+ mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+}
+
+/* hsr_prp_node_table_show - Formats and prints node_table entries */
+static int
+hsr_prp_node_table_show(struct seq_file *sfp, void *data)
+{
+ struct hsr_priv *priv = (struct hsr_priv *)sfp->private;
+ struct hsr_node *node;
+
+ seq_puts(sfp, "Node Table entries\n");
+ seq_puts(sfp, "MAC-Address-A, MAC-Address-B, time_in[A], ");
+ seq_puts(sfp, "time_in[B], Address-B port\n");
+ rcu_read_lock();
+ list_for_each_entry_rcu(node, &priv->node_db, mac_list) {
+ /* skip self node */
+ if (hsr_addr_is_self(priv, node->macaddress_A))
+ continue;
+ print_mac_address(sfp, &node->macaddress_A[0]);
+ seq_puts(sfp, " ");
+ print_mac_address(sfp, &node->macaddress_B[0]);
+ seq_printf(sfp, "0x%lx, ", node->time_in[HSR_PT_SLAVE_A]);
+ seq_printf(sfp, "0x%lx ", node->time_in[HSR_PT_SLAVE_B]);
+ seq_printf(sfp, "0x%x\n", node->addr_B_port);
+ }
+ rcu_read_unlock();
+ return 0;
+}
+
+/* hsr_prp_node_table_open - Open the node_table file
+ *
+ * Description:
+ * This routine opens a debugfs file node_table of specific hsr device
+ */
+static int
+hsr_prp_node_table_open(struct inode *inode, struct file *filp)
+{
+ return single_open(filp, hsr_prp_node_table_show, inode->i_private);
+}
+
+static const struct file_operations hsr_prp_fops = {
+ .owner = THIS_MODULE,
+ .open = hsr_prp_node_table_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+/* hsr_prp_debugfs_init - create hsr-prp node_table file for dumping
+ * the node table
+ *
+ * Description:
+ * When debugfs is configured this routine sets up the node_table file per
+ * hsr/prp device for dumping the node_table entries
+ */
+int hsr_prp_debugfs_init(struct hsr_priv *priv)
+{
+ int rc = -1;
+ struct dentry *de = NULL;
+
+ de = debugfs_create_dir("hsr", NULL);
+ if (!de) {
+ pr_err("Cannot create hsr-prp debugfs root\n");
+ return rc;
+ }
+
+ priv->node_tbl_root = de;
+
+ de = debugfs_create_file("node_table", S_IFREG | 0444,
+ priv->node_tbl_root, priv,
+ &hsr_prp_fops);
+ if (!de) {
+ pr_err("Cannot create hsr-prp node_table directory\n");
+ return rc;
+ }
+ priv->node_tbl_file = de;
+ rc = 0;
+
+ return rc;
+}
+
+/* hsr_prp_debugfs_term - Tear down debugfs intrastructure
+ *
+ * Description:
+ * When Debufs is configured this routine removes debugfs file system
+ * elements that are specific to hsr-prp
+ */
+void
+hsr_prp_debugfs_term(struct hsr_priv *priv)
+{
+ debugfs_remove(priv->node_tbl_file);
+ priv->node_tbl_file = NULL;
+ debugfs_remove(priv->node_tbl_root);
+ priv->node_tbl_root = NULL;
+}
--
2.17.0
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