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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>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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. | ||
| */ | ||
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| #include <linux/capability.h> | ||
| #include <linux/kernel.h> | ||
| #include <linux/netdevice.h> | ||
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| #include "bonding.h" | ||
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| struct slave_attribute { | ||
| struct attribute attr; | ||
| ssize_t (*show)(struct slave *, char *); | ||
| }; | ||
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| #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) | ||
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| 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); | ||
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| 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); | ||
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| 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); | ||
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| 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); | ||
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| 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); | ||
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| static ssize_t ad_aggregator_id_show(struct slave *slave, char *buf) | ||
| { | ||
| const struct aggregator *agg; | ||
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| 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); | ||
| } | ||
|
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| return sprintf(buf, "N/A\n"); | ||
| } | ||
| static SLAVE_ATTR_RO(ad_aggregator_id); | ||
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| 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 | ||
| }; | ||
|
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| #define to_slave_attr(_at) container_of(_at, struct slave_attribute, attr) | ||
| #define to_slave(obj) container_of(obj, struct slave, kobj) | ||
|
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| 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); | ||
|
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| return slave_attr->show(slave, buf); | ||
| } | ||
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| const struct sysfs_ops slave_sysfs_ops = { | ||
| .show = slave_show, | ||
| }; | ||
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| static struct kobj_type slave_ktype = { | ||
| #ifdef CONFIG_SYSFS | ||
| .sysfs_ops = &slave_sysfs_ops, | ||
| #endif | ||
| }; | ||
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| int bond_sysfs_slave_add(struct slave *slave) | ||
| { | ||
| const struct slave_attribute **a; | ||
| int err; | ||
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| err = kobject_init_and_add(&slave->kobj, &slave_ktype, | ||
| &(slave->dev->dev.kobj), "slave"); | ||
| if (err) | ||
| return err; | ||
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| for (a = slave_attrs; *a; ++a) { | ||
| err = sysfs_create_file(&slave->kobj, &((*a)->attr)); | ||
| if (err) { | ||
| kobject_del(&slave->kobj); | ||
| return err; | ||
| } | ||
| } | ||
|
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| return 0; | ||
| } | ||
|
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| void bond_sysfs_slave_del(struct slave *slave) | ||
| { | ||
| const struct slave_attribute **a; | ||
|
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| for (a = slave_attrs; *a; ++a) | ||
| sysfs_remove_file(&slave->kobj, &((*a)->attr)); | ||
|
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| kobject_del(&slave->kobj); | ||
| } |
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