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         if (qeth_card_hw_is_reachable(card) &&
  27                                         card->options.sbp.supported_funcs)
  28                 rc = qeth_bridgeport_query_ports(card,
  29                         &card->options.sbp.role, &state);
  30         if (!rc) {
  31                 if (show_state)
  32                         switch (state) {
  33                         case QETH_SBP_STATE_INACTIVE:
  34                                 word = "inactive"; break;
  35                         case QETH_SBP_STATE_STANDBY:
  36                                 word = "standby"; break;
  37                         case QETH_SBP_STATE_ACTIVE:
  38                                 word = "active"; break;
  39                         default:
  40                                 rc = -EIO;
  41                         }
  42                 else
  43                         switch (card->options.sbp.role) {
  44                         case QETH_SBP_ROLE_NONE:
  45                                 word = "none"; break;
  46                         case QETH_SBP_ROLE_PRIMARY:
  47                                 word = "primary"; break;
  48                         case QETH_SBP_ROLE_SECONDARY:
  49                                 word = "secondary"; break;
  50                         default:
  51                                 rc = -EIO;
  52                         }
  53                 if (rc)
  54                         QETH_CARD_TEXT_(card, 2, "SBP%02x:%02x",
  55                                 card->options.sbp.role, state);
  56                 else
  57                         rc = sprintf(buf, "%s\n", word);
  58         }
  59
  60         return rc;
  61 }
  62
  63 static ssize_t qeth_bridge_port_role_show(struct device *dev,
  64                                 struct device_attribute *attr, char *buf)
  65 {
  66         return qeth_bridge_port_role_state_show(dev, attr, buf, 0);
  67 }
  68
  69 static ssize_t qeth_bridge_port_role_store(struct device *dev,
  70                 struct device_attribute *attr, const char *buf, size_t count)
  71 {
  72         struct qeth_card *card = dev_get_drvdata(dev);
  73         int rc = 0;
  74         enum qeth_sbp_roles role;
  75
  76         if (!card)
  77                 return -EINVAL;
  78         if (sysfs_streq(buf, "primary"))
  79                 role = QETH_SBP_ROLE_PRIMARY;
  80         else if (sysfs_streq(buf, "secondary"))
  81                 role = QETH_SBP_ROLE_SECONDARY;
  82         else if (sysfs_streq(buf, "none"))
  83                 role = QETH_SBP_ROLE_NONE;
  84         else
  85                 return -EINVAL;
  86
  87         mutex_lock(&card->conf_mutex);
  88
  89         if (card->options.sbp.reflect_promisc) /* Forbid direct manipulation */
  90                 rc = -EPERM;
  91         else if (qeth_card_hw_is_reachable(card)) {
  92                 rc = qeth_bridgeport_setrole(card, role);
  93                 if (!rc)
  94                         card->options.sbp.role = role;
  95         } else
  96                 card->options.sbp.role = role;
  97
  98         mutex_unlock(&card->conf_mutex);
  99
 100         return rc ? rc : count;
 101 }
 102
 103 static DEVICE_ATTR(bridge_role, 0644, qeth_bridge_port_role_show,
 104                    qeth_bridge_port_role_store);
 105
 106 static ssize_t qeth_bridge_port_state_show(struct device *dev,
 107                                 struct device_attribute *attr, char *buf)
 108 {
 109         return qeth_bridge_port_role_state_show(dev, attr, buf, 1);
 110 }
 111
 112 static DEVICE_ATTR(bridge_state, 0644, qeth_bridge_port_state_show,
 113                    NULL);
 114
 115 static ssize_t qeth_bridgeport_hostnotification_show(struct device *dev,
 116                                 struct device_attribute *attr, char *buf)
 117 {
 118         struct qeth_card *card = dev_get_drvdata(dev);
 119         int enabled;
 120
 121         if (!card)
 122                 return -EINVAL;
 123
 124         enabled = card->options.sbp.hostnotification;
 125
 126         return sprintf(buf, "%d\n", enabled);
 127 }
 128
 129 static ssize_t qeth_bridgeport_hostnotification_store(struct device *dev,
 130                 struct device_attribute *attr, const char *buf, size_t count)
 131 {
 132         struct qeth_card *card = dev_get_drvdata(dev);
 133         int rc = 0;
 134         int enable;
 135
 136         if (!card)
 137                 return -EINVAL;
 138
 139         if (sysfs_streq(buf, "0"))
 140                 enable = 0;
 141         else if (sysfs_streq(buf, "1"))
 142                 enable = 1;
 143         else
 144                 return -EINVAL;
 145
 146         mutex_lock(&card->conf_mutex);
 147
 148         if (qeth_card_hw_is_reachable(card)) {
 149                 rc = qeth_bridgeport_an_set(card, enable);
 150                 if (!rc)
 151                         card->options.sbp.hostnotification = enable;
 152         } else
 153                 card->options.sbp.hostnotification = enable;
 154
 155         mutex_unlock(&card->conf_mutex);
 156
 157         return rc ? rc : count;
 158 }
 159
 160 static DEVICE_ATTR(bridge_hostnotify, 0644,
 161                         qeth_bridgeport_hostnotification_show,
 162                         qeth_bridgeport_hostnotification_store);
 163
 164 static ssize_t qeth_bridgeport_reflect_show(struct device *dev,
 165                                 struct device_attribute *attr, char *buf)
 166 {
 167         struct qeth_card *card = dev_get_drvdata(dev);
 168         char *state;
 169
 170         if (!card)
 171                 return -EINVAL;
 172
 173         if (card->options.sbp.reflect_promisc) {
 174                 if (card->options.sbp.reflect_promisc_primary)
 175                         state = "primary";
 176                 else
 177                         state = "secondary";
 178         } else
 179                 state = "none";
 180
 181         return sprintf(buf, "%s\n", state);
 182 }
 183
 184 static ssize_t qeth_bridgeport_reflect_store(struct device *dev,
 185                 struct device_attribute *attr, const char *buf, size_t count)
 186 {
 187         struct qeth_card *card = dev_get_drvdata(dev);
 188         int enable, primary;
 189         int rc = 0;
 190
 191         if (!card)
 192                 return -EINVAL;
 193
 194         if (sysfs_streq(buf, "none")) {
 195                 enable = 0;
 196                 primary = 0;
 197         } else if (sysfs_streq(buf, "primary")) {
 198                 enable = 1;
 199                 primary = 1;
 200         } else if (sysfs_streq(buf, "secondary")) {
 201                 enable = 1;
 202                 primary = 0;
 203         } else
 204                 return -EINVAL;
 205
 206         mutex_lock(&card->conf_mutex);
 207
 208         if (card->options.sbp.role != QETH_SBP_ROLE_NONE)
 209                 rc = -EPERM;
 210         else {
 211                 card->options.sbp.reflect_promisc = enable;
 212                 card->options.sbp.reflect_promisc_primary = primary;
 213                 rc = 0;
 214         }
 215
 216         mutex_unlock(&card->conf_mutex);
 217
 218         return rc ? rc : count;
 219 }
 220
 221 static DEVICE_ATTR(bridge_reflect_promisc, 0644,
 222                         qeth_bridgeport_reflect_show,
 223                         qeth_bridgeport_reflect_store);
 224
 225 static struct attribute *qeth_l2_bridgeport_attrs[] = {
 226         &dev_attr_bridge_role.attr,
 227         &dev_attr_bridge_state.attr,
 228         &dev_attr_bridge_hostnotify.attr,
 229         &dev_attr_bridge_reflect_promisc.attr,
 230         NULL,
 231 };
 232
 233 static struct attribute_group qeth_l2_bridgeport_attr_group = {
 234         .attrs = qeth_l2_bridgeport_attrs,
 235 };
 236
 237 int qeth_l2_create_device_attributes(struct device *dev)
 238 {
 239         return sysfs_create_group(&dev->kobj, &qeth_l2_bridgeport_attr_group);
 240 }
 241
 242 void qeth_l2_remove_device_attributes(struct device *dev)
 243 {
 244         sysfs_remove_group(&dev->kobj, &qeth_l2_bridgeport_attr_group);
 245 }
 246
 247 /**
 248  * qeth_l2_setup_bridgeport_attrs() - set/restore attrs when turning online.
 249  * @card:                             qeth_card structure pointer
 250  *
 251  * Note: this function is called with conf_mutex held by the caller
 252  */
 253 void qeth_l2_setup_bridgeport_attrs(struct qeth_card *card)
 254 {
 255         int rc;
 256
 257         if (!card)
 258                 return;
 259         if (!card->options.sbp.supported_funcs)
 260                 return;
 261         if (card->options.sbp.role != QETH_SBP_ROLE_NONE) {
 262                 /* Conditional to avoid spurious error messages */
 263                 qeth_bridgeport_setrole(card, card->options.sbp.role);
 264                 /* Let the callback function refresh the stored role value. */
 265                 qeth_bridgeport_query_ports(card,
 266                         &card->options.sbp.role, NULL);
 267         }
 268         if (card->options.sbp.hostnotification) {
 269                 rc = qeth_bridgeport_an_set(card, 1);
 270                 if (rc)
 271                         card->options.sbp.hostnotification = 0;
 272         } else
 273                 qeth_bridgeport_an_set(card, 0);
 274 }