kernel/drivers/net/bonding/bond_sysfs_slave.c

   1 /*      Sysfs attributes of bond slaves
   2  *
   3  *      Copyright (c) 2014 Scott Feldman <sfeldma@cumulusnetworks.com>
   4  *
   5  *      This program is free software; you can redistribute it and/or
   6  *      modify it under the terms of the GNU General Public License
   7  *      as published by the Free Software Foundation; either version
   8  *      2 of the License, or (at your option) any later version.
   9  */
  10
  11 #include <linux/capability.h>
  12 #include <linux/kernel.h>
  13 #include <linux/netdevice.h>
  14
  15 #include <net/bonding.h>
  16
  17 struct slave_attribute {
  18         struct attribute attr;
  19         ssize_t (*show)(struct slave *, char *);
  20 };
  21
  22 #define SLAVE_ATTR(_name, _mode, _show)                         \
  23 const struct slave_attribute slave_attr_##_name = {             \
  24         .attr = {.name = __stringify(_name),                    \
  25                  .mode = _mode },                               \
  26         .show   = _show,                                        \
  27 };
  28 #define SLAVE_ATTR_RO(_name) \
  29         SLAVE_ATTR(_name, S_IRUGO, _name##_show)
  30
  31 static ssize_t state_show(struct slave *slave, char *buf)
  32 {
  33         switch (bond_slave_state(slave)) {
  34         case BOND_STATE_ACTIVE:
  35                 return sprintf(buf, "active\n");
  36         case BOND_STATE_BACKUP:
  37                 return sprintf(buf, "backup\n");
  38         default:
  39                 return sprintf(buf, "UNKNOWN\n");
  40         }
  41 }
  42 static SLAVE_ATTR_RO(state);
  43
  44 static ssize_t mii_status_show(struct slave *slave, char *buf)
  45 {
  46         return sprintf(buf, "%s\n", bond_slave_link_status(slave->link));
  47 }
  48 static SLAVE_ATTR_RO(mii_status);
  49
  50 static ssize_t link_failure_count_show(struct slave *slave, char *buf)
  51 {
  52         return sprintf(buf, "%d\n", slave->link_failure_count);
  53 }
  54 static SLAVE_ATTR_RO(link_failure_count);
  55
  56 static ssize_t perm_hwaddr_show(struct slave *slave, char *buf)
  57 {
  58         return sprintf(buf, "%pM\n", slave->perm_hwaddr);
  59 }
  60 static SLAVE_ATTR_RO(perm_hwaddr);
  61
  62 static ssize_t queue_id_show(struct slave *slave, char *buf)
  63 {
  64         return sprintf(buf, "%d\n", slave->queue_id);
  65 }
  66 static SLAVE_ATTR_RO(queue_id);
  67
  68 static ssize_t ad_aggregator_id_show(struct slave *slave, char *buf)
  69 {
  70         const struct aggregator *agg;
  71
  72         if (BOND_MODE(slave->bond) == BOND_MODE_8023AD) {
  73                 agg = SLAVE_AD_INFO(slave)->port.aggregator;
  74                 if (agg)
  75                         return sprintf(buf, "%d\n",
  76                                        agg->aggregator_identifier);
  77         }
  78
  79         return sprintf(buf, "N/A\n");
  80 }
  81 static SLAVE_ATTR_RO(ad_aggregator_id);
  82
  83 static const struct slave_attribute *slave_attrs[] = {
  84         &slave_attr_state,
  85         &slave_attr_mii_status,
  86         &slave_attr_link_failure_count,
  87         &slave_attr_perm_hwaddr,
  88         &slave_attr_queue_id,
  89         &slave_attr_ad_aggregator_id,
  90         NULL
  91 };
  92
  93 #define to_slave_attr(_at) container_of(_at, struct slave_attribute, attr)
  94 #define to_slave(obj)   container_of(obj, struct slave, kobj)
  95
  96 static ssize_t slave_show(struct kobject *kobj,
  97                           struct attribute *attr, char *buf)
  98 {
  99         struct slave_attribute *slave_attr = to_slave_attr(attr);
 100         struct slave *slave = to_slave(kobj);
 101
 102         return slave_attr->show(slave, buf);
 103 }
 104
 105 static const struct sysfs_ops slave_sysfs_ops = {
 106         .show = slave_show,
 107 };
 108
 109 static struct kobj_type slave_ktype = {
 110 #ifdef CONFIG_SYSFS
 111         .sysfs_ops = &slave_sysfs_ops,
 112 #endif
 113 };
 114
 115 int bond_sysfs_slave_add(struct slave *slave)
 116 {
 117         const struct slave_attribute **a;
 118         int err;
 119
 120         err = kobject_init_and_add(&slave->kobj, &slave_ktype,
 121                                    &(slave->dev->dev.kobj), "bonding_slave");
 122         if (err)
 123                 return err;
 124
 125         for (a = slave_attrs; *a; ++a) {
 126                 err = sysfs_create_file(&slave->kobj, &((*a)->attr));
 127                 if (err) {
 128                         kobject_put(&slave->kobj);
 129                         return err;
 130                 }
 131         }
 132
 133         return 0;
 134 }
 135
 136 void bond_sysfs_slave_del(struct slave *slave)
 137 {
 138         const struct slave_attribute **a;
 139
 140         for (a = slave_attrs; *a; ++a)
 141                 sysfs_remove_file(&slave->kobj, &((*a)->attr));
 142
 143         kobject_put(&slave->kobj);
 144 }