bonding: add sysfs /slave dir for bond slave devices.
Add sub-directory under /sys/class/net/<interface>/slave with
read-only attributes for slave. Directory only appears when
<interface> is a slave.
$ tree /sys/class/net/eth2/slave/
/sys/class/net/eth2/slave/
├── ad_aggregator_id
├── link_failure_count
├── mii_status
├── perm_hwaddr
├── queue_id
└── state
$ cat /sys/class/net/eth2/slave/*
2
0
up
40:02:10:ef:06:01
0
active
Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bond_sysfs_slave.c b/drivers/net/bonding/bond_sysfs_slave.c
new file mode 100644
index 0000000..7cb97de
--- /dev/null
+++ b/drivers/net/bonding/bond_sysfs_slave.c
@@ -0,0 +1,144 @@
+/* Sysfs attributes of bond slaves
+ *
+ * Copyright (c) 2014 Scott Feldman <sfeldma@cumulusnetworks.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; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/capability.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+
+#include "bonding.h"
+
+struct slave_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct slave *, char *);
+};
+
+#define SLAVE_ATTR(_name, _mode, _show) \
+const struct slave_attribute slave_attr_##_name = { \
+ .attr = {.name = __stringify(_name), \
+ .mode = _mode }, \
+ .show = _show, \
+};
+#define SLAVE_ATTR_RO(_name) \
+ SLAVE_ATTR(_name, S_IRUGO, _name##_show)
+
+static ssize_t state_show(struct slave *slave, char *buf)
+{
+ switch (bond_slave_state(slave)) {
+ case BOND_STATE_ACTIVE:
+ return sprintf(buf, "active\n");
+ case BOND_STATE_BACKUP:
+ return sprintf(buf, "backup\n");
+ default:
+ return sprintf(buf, "UNKONWN\n");
+ }
+}
+static SLAVE_ATTR_RO(state);
+
+static ssize_t mii_status_show(struct slave *slave, char *buf)
+{
+ return sprintf(buf, "%s\n", bond_slave_link_status(slave->link));
+}
+static SLAVE_ATTR_RO(mii_status);
+
+static ssize_t link_failure_count_show(struct slave *slave, char *buf)
+{
+ return sprintf(buf, "%d\n", slave->link_failure_count);
+}
+static SLAVE_ATTR_RO(link_failure_count);
+
+static ssize_t perm_hwaddr_show(struct slave *slave, char *buf)
+{
+ return sprintf(buf, "%pM\n", slave->perm_hwaddr);
+}
+static SLAVE_ATTR_RO(perm_hwaddr);
+
+static ssize_t queue_id_show(struct slave *slave, char *buf)
+{
+ return sprintf(buf, "%d\n", slave->queue_id);
+}
+static SLAVE_ATTR_RO(queue_id);
+
+static ssize_t ad_aggregator_id_show(struct slave *slave, char *buf)
+{
+ const struct aggregator *agg;
+
+ if (slave->bond->params.mode == BOND_MODE_8023AD) {
+ agg = SLAVE_AD_INFO(slave).port.aggregator;
+ if (agg)
+ return sprintf(buf, "%d\n",
+ agg->aggregator_identifier);
+ }
+
+ return sprintf(buf, "N/A\n");
+}
+static SLAVE_ATTR_RO(ad_aggregator_id);
+
+static const struct slave_attribute *slave_attrs[] = {
+ &slave_attr_state,
+ &slave_attr_mii_status,
+ &slave_attr_link_failure_count,
+ &slave_attr_perm_hwaddr,
+ &slave_attr_queue_id,
+ &slave_attr_ad_aggregator_id,
+ NULL
+};
+
+#define to_slave_attr(_at) container_of(_at, struct slave_attribute, attr)
+#define to_slave(obj) container_of(obj, struct slave, kobj)
+
+static ssize_t slave_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ struct slave_attribute *slave_attr = to_slave_attr(attr);
+ struct slave *slave = to_slave(kobj);
+
+ return slave_attr->show(slave, buf);
+}
+
+const struct sysfs_ops slave_sysfs_ops = {
+ .show = slave_show,
+};
+
+static struct kobj_type slave_ktype = {
+#ifdef CONFIG_SYSFS
+ .sysfs_ops = &slave_sysfs_ops,
+#endif
+};
+
+int bond_sysfs_slave_add(struct slave *slave)
+{
+ const struct slave_attribute **a;
+ int err;
+
+ err = kobject_init_and_add(&slave->kobj, &slave_ktype,
+ &(slave->dev->dev.kobj), "slave");
+ if (err)
+ return err;
+
+ for (a = slave_attrs; *a; ++a) {
+ err = sysfs_create_file(&slave->kobj, &((*a)->attr));
+ if (err) {
+ kobject_del(&slave->kobj);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+void bond_sysfs_slave_del(struct slave *slave)
+{
+ const struct slave_attribute **a;
+
+ for (a = slave_attrs; *a; ++a)
+ sysfs_remove_file(&slave->kobj, &((*a)->attr));
+
+ kobject_del(&slave->kobj);
+}