kernel/drivers/s390/net/qeth_l2_sys.c

   1 /*
   2  *    Copyright IBM Corp. 2013
   3  *    Author(s): Eugene Crosser <eugene.crosser@ru.ibm.com>
   4  */
   5
   6 #include <linux/slab.h>
   7 #include <asm/ebcdic.h>
   8 #include "qeth_core.h"
   9 #include "qeth_l2.h"
  10
  11 #define QETH_DEVICE_ATTR(_id, _name, _mode, _show, _store) \
  12 struct device_attribute dev_attr_##_id = __ATTR(_name, _mode, _show, _store)
  13
  14 static ssize_t qeth_bridge_port_role_state_show(struct device *dev,
  15                                 struct device_attribute *attr, char *buf,
  16                                 int show_state)
  17 {
  18         struct qeth_card *card = dev_get_drvdata(dev);
  19         enum qeth_sbp_states state = QETH_SBP_STATE_INACTIVE;
  20         int rc = 0;
  21         char *word;
  22
  23         if (!card)
  24                 return -EINVAL;
  25
  26         mutex_lock(&card->conf_mutex);
  27
  28         if (qeth_card_hw_is_reachable(card) &&
  29                                         card->options.sbp.supported_funcs)
  30                 rc = qeth_bridgeport_query_ports(card,
  31                         &card->options.sbp.role, &state);
  32         if (!rc) {
  33                 if (show_state)
  34                         switch (state) {
  35                         case QETH_SBP_STATE_INACTIVE:
  36                                 word = "inactive"; break;
  37                         case QETH_SBP_STATE_STANDBY:
  38                                 word = "standby"; break;
  39                         case QETH_SBP_STATE_ACTIVE:
  40                                 word = "active"; break;
  41                         default:
  42                                 rc = -EIO;
  43                         }
  44                 else
  45                         switch (card->options.sbp.role) {
  46                         case QETH_SBP_ROLE_NONE:
  47                                 word = "none"; break;
  48                         case QETH_SBP_ROLE_PRIMARY:
  49                                 word = "primary"; break;
  50                         case QETH_SBP_ROLE_SECONDARY:
  51                                 word = "secondary"; break;
  52                         default:
  53                                 rc = -EIO;
  54                         }
  55                 if (rc)
  56                         QETH_CARD_TEXT_(card, 2, "SBP%02x:%02x",
  57                                 card->options.sbp.role, state);
  58                 else
  59                         rc = sprintf(buf, "%s\n", word);
  60         }
  61
  62         mutex_unlock(&card->conf_mutex);
  63
  64         return rc;
  65 }
  66
  67 static ssize_t qeth_bridge_port_role_show(struct device *dev,
  68                                 struct device_attribute *attr, char *buf)
  69 {
  70         return qeth_bridge_port_role_state_show(dev, attr, buf, 0);
  71 }
  72
  73 static ssize_t qeth_bridge_port_role_store(struct device *dev,
  74                 struct device_attribute *attr, const char *buf, size_t count)
  75 {
  76         struct qeth_card *card = dev_get_drvdata(dev);
  77         int rc = 0;
  78         enum qeth_sbp_roles role;
  79
  80         if (!card)
  81                 return -EINVAL;
  82         if (sysfs_streq(buf, "primary"))
  83                 role = QETH_SBP_ROLE_PRIMARY;
  84         else if (sysfs_streq(buf, "secondary"))
  85                 role = QETH_SBP_ROLE_SECONDARY;
  86         else if (sysfs_streq(buf, "none"))
  87                 role = QETH_SBP_ROLE_NONE;
  88         else
  89                 return -EINVAL;
  90
  91         mutex_lock(&card->conf_mutex);
  92
  93         if (qeth_card_hw_is_reachable(card)) {
  94                 rc = qeth_bridgeport_setrole(card, role);
  95                 if (!rc)
  96                         card->options.sbp.role = role;
  97         } else
  98                 card->options.sbp.role = role;
  99
 100         mutex_unlock(&card->conf_mutex);
 101
 102         return rc ? rc : count;
 103 }
 104
 105 static DEVICE_ATTR(bridge_role, 0644, qeth_bridge_port_role_show,
 106                    qeth_bridge_port_role_store);
 107
 108 static ssize_t qeth_bridge_port_state_show(struct device *dev,
 109                                 struct device_attribute *attr, char *buf)
 110 {
 111         return qeth_bridge_port_role_state_show(dev, attr, buf, 1);
 112 }
 113
 114 static DEVICE_ATTR(bridge_state, 0644, qeth_bridge_port_state_show,
 115                    NULL);
 116
 117 static ssize_t qeth_bridgeport_hostnotification_show(struct device *dev,
 118                                 struct device_attribute *attr, char *buf)
 119 {
 120         struct qeth_card *card = dev_get_drvdata(dev);
 121         int enabled;
 122
 123         if (!card)
 124                 return -EINVAL;
 125
 126         mutex_lock(&card->conf_mutex);
 127
 128         enabled = card->options.sbp.hostnotification;
 129
 130         mutex_unlock(&card->conf_mutex);
 131
 132         return sprintf(buf, "%d\n", enabled);
 133 }
 134
 135 static ssize_t qeth_bridgeport_hostnotification_store(struct device *dev,
 136                 struct device_attribute *attr, const char *buf, size_t count)
 137 {
 138         struct qeth_card *card = dev_get_drvdata(dev);
 139         int rc = 0;
 140         int enable;
 141
 142         if (!card)
 143                 return -EINVAL;
 144
 145         if (sysfs_streq(buf, "0"))
 146                 enable = 0;
 147         else if (sysfs_streq(buf, "1"))
 148                 enable = 1;
 149         else
 150                 return -EINVAL;
 151
 152         mutex_lock(&card->conf_mutex);
 153
 154         if (qeth_card_hw_is_reachable(card)) {
 155                 rc = qeth_bridgeport_an_set(card, enable);
 156                 if (!rc)
 157                         card->options.sbp.hostnotification = enable;
 158         } else
 159                 card->options.sbp.hostnotification = enable;
 160
 161         mutex_unlock(&card->conf_mutex);
 162
 163         return rc ? rc : count;
 164 }
 165
 166 static DEVICE_ATTR(bridge_hostnotify, 0644,
 167                         qeth_bridgeport_hostnotification_show,
 168                         qeth_bridgeport_hostnotification_store);
 169
 170 static struct attribute *qeth_l2_bridgeport_attrs[] = {
 171         &dev_attr_bridge_role.attr,
 172         &dev_attr_bridge_state.attr,
 173         &dev_attr_bridge_hostnotify.attr,
 174         NULL,
 175 };
 176
 177 static struct attribute_group qeth_l2_bridgeport_attr_group = {
 178         .attrs = qeth_l2_bridgeport_attrs,
 179 };
 180
 181 int qeth_l2_create_device_attributes(struct device *dev)
 182 {
 183         return sysfs_create_group(&dev->kobj, &qeth_l2_bridgeport_attr_group);
 184 }
 185
 186 void qeth_l2_remove_device_attributes(struct device *dev)
 187 {
 188         sysfs_remove_group(&dev->kobj, &qeth_l2_bridgeport_attr_group);
 189 }
 190
 191 /**
 192  * qeth_l2_setup_bridgeport_attrs() - set/restore attrs when turning online.
 193  * @card:                             qeth_card structure pointer
 194  *
 195  * Note: this function is called with conf_mutex held by the caller
 196  */
 197 void qeth_l2_setup_bridgeport_attrs(struct qeth_card *card)
 198 {
 199         int rc;
 200
 201         if (!card)
 202                 return;
 203         if (!card->options.sbp.supported_funcs)
 204                 return;
 205         if (card->options.sbp.role != QETH_SBP_ROLE_NONE) {
 206                 /* Conditional to avoid spurious error messages */
 207                 qeth_bridgeport_setrole(card, card->options.sbp.role);
 208                 /* Let the callback function refresh the stored role value. */
 209                 qeth_bridgeport_query_ports(card,
 210                         &card->options.sbp.role, NULL);
 211         }
 212         if (card->options.sbp.hostnotification) {
 213                 rc = qeth_bridgeport_an_set(card, 1);
 214                 if (rc)
 215                         card->options.sbp.hostnotification = 0;
 216         } else
 217                 qeth_bridgeport_an_set(card, 0);
 218 }