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Subject[PATCH net-next 07/11] net: dsa: debugfs: add port fdb
Date
Add a debug filesystem "fdb" entry to query a port's hardware FDB
entries through the .port_fdb_dump switch operation.

This is really convenient to query directly the hardware or inspect DSA
or CPU links, since these ports are not exposed to userspace.

# cat port1/fdb
vid 0 12:34:56:78:90:ab static unicast

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
---
net/dsa/debugfs.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)

diff --git a/net/dsa/debugfs.c b/net/dsa/debugfs.c
index 012fcf466cc1..8204c62dc9c1 100644
--- a/net/dsa/debugfs.c
+++ b/net/dsa/debugfs.c
@@ -10,6 +10,7 @@
*/

#include <linux/debugfs.h>
+#include <linux/etherdevice.h>
#include <linux/seq_file.h>

#include "dsa_priv.h"
@@ -109,6 +110,36 @@ static int dsa_debugfs_create_file(struct dsa_switch *ds, struct dentry *dir,
return 0;
}

+static int dsa_debugfs_fdb_dump_cb(const unsigned char *addr, u16 vid,
+ bool is_static, void *data)
+{
+ struct seq_file *seq = data;
+ int i;
+
+ seq_printf(seq, "vid %d", vid);
+ for (i = 0; i < ETH_ALEN; i++)
+ seq_printf(seq, "%s%02x", i ? ":" : " ", addr[i]);
+ seq_printf(seq, " %s", is_static ? "static" : "dynamic");
+ seq_printf(seq, " %s", is_unicast_ether_addr(addr) ?
+ "unicast" : "multicast");
+ seq_puts(seq, "\n");
+
+ return 0;
+}
+
+static int dsa_debugfs_fdb_read(struct dsa_switch *ds, int id,
+ struct seq_file *seq)
+{
+ if (!ds->ops->port_fdb_dump)
+ return -EOPNOTSUPP;
+
+ return ds->ops->port_fdb_dump(ds, id, dsa_debugfs_fdb_dump_cb, seq);
+}
+
+static const struct dsa_debugfs_ops dsa_debugfs_fdb_ops = {
+ .read = dsa_debugfs_fdb_read,
+};
+
static void dsa_debugfs_regs_read_count(struct dsa_switch *ds, int id,
struct seq_file *seq, int count)
{
@@ -253,6 +284,11 @@ static int dsa_debugfs_create_port(struct dsa_switch *ds, int port)
if (IS_ERR_OR_NULL(dir))
return -EFAULT;

+ err = dsa_debugfs_create_file(ds, dir, "fdb", port,
+ &dsa_debugfs_fdb_ops);
+ if (err)
+ return err;
+
err = dsa_debugfs_create_file(ds, dir, "regs", port,
&dsa_debugfs_regs_ops);
if (err)
--
2.14.0
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