drivers/net/wireless/marvell/libertas/cmdresp.c

   1 /*
   2  * This file contains the handling of command
   3  * responses as well as events generated by firmware.
   4  */
   5
   6 #include <linux/hardirq.h>
   7 #include <linux/slab.h>
   8 #include <linux/delay.h>
   9 #include <linux/sched.h>
  10 #include <asm/unaligned.h>
  11 #include <net/cfg80211.h>
  12
  13 #include "cfg.h"
  14 #include "cmd.h"
  15
  16 /**
  17  * lbs_mac_event_disconnected - handles disconnect event. It
  18  * reports disconnect to upper layer, clean tx/rx packets,
  19  * reset link state etc.
  20  *
  21  * @priv:       A pointer to struct lbs_private structure
  22  * @locally_generated: indicates disconnect was requested locally
  23  *              (usually by userspace)
  24  *
  25  * returns:     n/a
  26  */
  27 void lbs_mac_event_disconnected(struct lbs_private *priv,
  28                                 bool locally_generated)
  29 {
  30         unsigned long flags;
  31
  32         if (priv->connect_status != LBS_CONNECTED)
  33                 return;
  34
  35         lbs_deb_enter(LBS_DEB_ASSOC);
  36
  37         /*
  38          * Cisco AP sends EAP failure and de-auth in less than 0.5 ms.
  39          * It causes problem in the Supplicant
  40          */
  41         msleep_interruptible(1000);
  42
  43         if (priv->wdev->iftype == NL80211_IFTYPE_STATION)
  44                 lbs_send_disconnect_notification(priv, locally_generated);
  45
  46         /* report disconnect to upper layer */
  47         netif_stop_queue(priv->dev);
  48         netif_carrier_off(priv->dev);
  49
  50         /* Free Tx and Rx packets */
  51         spin_lock_irqsave(&priv->driver_lock, flags);
  52         kfree_skb(priv->currenttxskb);
  53         priv->currenttxskb = NULL;
  54         priv->tx_pending_len = 0;
  55         spin_unlock_irqrestore(&priv->driver_lock, flags);
  56
  57         priv->connect_status = LBS_DISCONNECTED;
  58
  59         if (priv->psstate != PS_STATE_FULL_POWER) {
  60                 /* make firmware to exit PS mode */
  61                 lbs_deb_cmd("disconnected, so exit PS mode\n");
  62                 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
  63         }
  64         lbs_deb_leave(LBS_DEB_ASSOC);
  65 }
  66
  67 int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
  68 {
  69         uint16_t respcmd, curcmd;
  70         struct cmd_header *resp;
  71         int ret = 0;
  72         unsigned long flags;
  73         uint16_t result;
  74
  75         lbs_deb_enter(LBS_DEB_HOST);
  76
  77         mutex_lock(&priv->lock);
  78         spin_lock_irqsave(&priv->driver_lock, flags);
  79
  80         if (!priv->cur_cmd) {
  81                 lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
  82                 ret = -1;
  83                 spin_unlock_irqrestore(&priv->driver_lock, flags);
  84                 goto done;
  85         }
  86
  87         resp = (void *)data;
  88         curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
  89         respcmd = le16_to_cpu(resp->command);
  90         result = le16_to_cpu(resp->result);
  91
  92         lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
  93                      respcmd, le16_to_cpu(resp->seqnum), len);
  94         lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);
  95
  96         if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
  97                 netdev_info(priv->dev,
  98                             "Received CMD_RESP with invalid sequence %d (expected %d)\n",
  99                             le16_to_cpu(resp->seqnum),
 100                             le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
 101                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 102                 ret = -1;
 103                 goto done;
 104         }
 105         if (respcmd != CMD_RET(curcmd) &&
 106             respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
 107                 netdev_info(priv->dev, "Invalid CMD_RESP %x to command %x!\n",
 108                             respcmd, curcmd);
 109                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 110                 ret = -1;
 111                 goto done;
 112         }
 113
 114         if (resp->result == cpu_to_le16(0x0004)) {
 115                 /* 0x0004 means -EAGAIN. Drop the response, let it time out
 116                    and be resubmitted */
 117                 netdev_info(priv->dev,
 118                             "Firmware returns DEFER to command %x. Will let it time out...\n",
 119                             le16_to_cpu(resp->command));
 120                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 121                 ret = -1;
 122                 goto done;
 123         }
 124
 125         /* Now we got response from FW, cancel the command timer */
 126         del_timer(&priv->command_timer);
 127         priv->cmd_timed_out = 0;
 128
 129         if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
 130                 /* struct cmd_ds_802_11_ps_mode also contains
 131                  * the header
 132                  */
 133                 struct cmd_ds_802_11_ps_mode *psmode = (void *)resp;
 134                 u16 action = le16_to_cpu(psmode->action);
 135
 136                 lbs_deb_host(
 137                        "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
 138                        result, action);
 139
 140                 if (result) {
 141                         lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
 142                                     result);
 143                         /*
 144                          * We should not re-try enter-ps command in
 145                          * ad-hoc mode. It takes place in
 146                          * lbs_execute_next_command().
 147                          */
 148                         if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR &&
 149                             action == PS_MODE_ACTION_ENTER_PS)
 150                                 priv->psmode = LBS802_11POWERMODECAM;
 151                 } else if (action == PS_MODE_ACTION_ENTER_PS) {
 152                         priv->needtowakeup = 0;
 153                         priv->psstate = PS_STATE_AWAKE;
 154
 155                         lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
 156                         if (priv->connect_status != LBS_CONNECTED) {
 157                                 /*
 158                                  * When Deauth Event received before Enter_PS command
 159                                  * response, We need to wake up the firmware.
 160                                  */
 161                                 lbs_deb_host(
 162                                        "disconnected, invoking lbs_ps_wakeup\n");
 163
 164                                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 165                                 mutex_unlock(&priv->lock);
 166                                 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS,
 167                                                 false);
 168                                 mutex_lock(&priv->lock);
 169                                 spin_lock_irqsave(&priv->driver_lock, flags);
 170                         }
 171                 } else if (action == PS_MODE_ACTION_EXIT_PS) {
 172                         priv->needtowakeup = 0;
 173                         priv->psstate = PS_STATE_FULL_POWER;
 174                         lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
 175                 } else {
 176                         lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
 177                 }
 178
 179                 __lbs_complete_command(priv, priv->cur_cmd, result);
 180                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 181
 182                 ret = 0;
 183                 goto done;
 184         }
 185
 186         /* If the command is not successful, cleanup and return failure */
 187         if ((result != 0 || !(respcmd & 0x8000))) {
 188                 lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
 189                        result, respcmd);
 190                 /*
 191                  * Handling errors here
 192                  */
 193                 switch (respcmd) {
 194                 case CMD_RET(CMD_GET_HW_SPEC):
 195                 case CMD_RET(CMD_802_11_RESET):
 196                         lbs_deb_host("CMD_RESP: reset failed\n");
 197                         break;
 198
 199                 }
 200                 __lbs_complete_command(priv, priv->cur_cmd, result);
 201                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 202
 203                 ret = -1;
 204                 goto done;
 205         }
 206
 207         spin_unlock_irqrestore(&priv->driver_lock, flags);
 208
 209         if (priv->cur_cmd && priv->cur_cmd->callback) {
 210                 ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
 211                                 resp);
 212         }
 213
 214         spin_lock_irqsave(&priv->driver_lock, flags);
 215
 216         if (priv->cur_cmd) {
 217                 /* Clean up and Put current command back to cmdfreeq */
 218                 __lbs_complete_command(priv, priv->cur_cmd, result);
 219         }
 220         spin_unlock_irqrestore(&priv->driver_lock, flags);
 221
 222 done:
 223         mutex_unlock(&priv->lock);
 224         lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
 225         return ret;
 226 }
 227
 228 int lbs_process_event(struct lbs_private *priv, u32 event)
 229 {
 230         int ret = 0;
 231         struct cmd_header cmd;
 232
 233         lbs_deb_enter(LBS_DEB_CMD);
 234
 235         switch (event) {
 236         case MACREG_INT_CODE_LINK_SENSED:
 237                 lbs_deb_cmd("EVENT: link sensed\n");
 238                 break;
 239
 240         case MACREG_INT_CODE_DEAUTHENTICATED:
 241                 lbs_deb_cmd("EVENT: deauthenticated\n");
 242                 lbs_mac_event_disconnected(priv, false);
 243                 break;
 244
 245         case MACREG_INT_CODE_DISASSOCIATED:
 246                 lbs_deb_cmd("EVENT: disassociated\n");
 247                 lbs_mac_event_disconnected(priv, false);
 248                 break;
 249
 250         case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
 251                 lbs_deb_cmd("EVENT: link lost\n");
 252                 lbs_mac_event_disconnected(priv, true);
 253                 break;
 254
 255         case MACREG_INT_CODE_PS_SLEEP:
 256                 lbs_deb_cmd("EVENT: ps sleep\n");
 257
 258                 /* handle unexpected PS SLEEP event */
 259                 if (priv->psstate == PS_STATE_FULL_POWER) {
 260                         lbs_deb_cmd(
 261                                "EVENT: in FULL POWER mode, ignoring PS_SLEEP\n");
 262                         break;
 263                 }
 264                 if (!list_empty(&priv->cmdpendingq)) {
 265                         lbs_deb_cmd("EVENT: commands in queue, do not sleep\n");
 266                         break;
 267                 }
 268                 priv->psstate = PS_STATE_PRE_SLEEP;
 269
 270                 lbs_ps_confirm_sleep(priv);
 271
 272                 break;
 273
 274         case MACREG_INT_CODE_HOST_AWAKE:
 275                 lbs_deb_cmd("EVENT: host awake\n");
 276                 if (priv->reset_deep_sleep_wakeup)
 277                         priv->reset_deep_sleep_wakeup(priv);
 278                 priv->is_deep_sleep = 0;
 279                 lbs_cmd_async(priv, CMD_802_11_WAKEUP_CONFIRM, &cmd,
 280                                 sizeof(cmd));
 281                 priv->is_host_sleep_activated = 0;
 282                 wake_up_interruptible(&priv->host_sleep_q);
 283                 break;
 284
 285         case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
 286                 if (priv->reset_deep_sleep_wakeup)
 287                         priv->reset_deep_sleep_wakeup(priv);
 288                 lbs_deb_cmd("EVENT: ds awake\n");
 289                 priv->is_deep_sleep = 0;
 290                 priv->wakeup_dev_required = 0;
 291                 wake_up_interruptible(&priv->ds_awake_q);
 292                 break;
 293
 294         case MACREG_INT_CODE_PS_AWAKE:
 295                 lbs_deb_cmd("EVENT: ps awake\n");
 296                 /* handle unexpected PS AWAKE event */
 297                 if (priv->psstate == PS_STATE_FULL_POWER) {
 298                         lbs_deb_cmd(
 299                                "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
 300                         break;
 301                 }
 302
 303                 priv->psstate = PS_STATE_AWAKE;
 304
 305                 if (priv->needtowakeup) {
 306                         /*
 307                          * wait for the command processing to finish
 308                          * before resuming sending
 309                          * priv->needtowakeup will be set to FALSE
 310                          * in lbs_ps_wakeup()
 311                          */
 312                         lbs_deb_cmd("waking up ...\n");
 313                         lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
 314                 }
 315                 break;
 316
 317         case MACREG_INT_CODE_MIC_ERR_UNICAST:
 318                 lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
 319                 lbs_send_mic_failureevent(priv, event);
 320                 break;
 321
 322         case MACREG_INT_CODE_MIC_ERR_MULTICAST:
 323                 lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
 324                 lbs_send_mic_failureevent(priv, event);
 325                 break;
 326
 327         case MACREG_INT_CODE_MIB_CHANGED:
 328                 lbs_deb_cmd("EVENT: MIB CHANGED\n");
 329                 break;
 330         case MACREG_INT_CODE_INIT_DONE:
 331                 lbs_deb_cmd("EVENT: INIT DONE\n");
 332                 break;
 333         case MACREG_INT_CODE_ADHOC_BCN_LOST:
 334                 lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
 335                 break;
 336         case MACREG_INT_CODE_RSSI_LOW:
 337                 netdev_alert(priv->dev, "EVENT: rssi low\n");
 338                 break;
 339         case MACREG_INT_CODE_SNR_LOW:
 340                 netdev_alert(priv->dev, "EVENT: snr low\n");
 341                 break;
 342         case MACREG_INT_CODE_MAX_FAIL:
 343                 netdev_alert(priv->dev, "EVENT: max fail\n");
 344                 break;
 345         case MACREG_INT_CODE_RSSI_HIGH:
 346                 netdev_alert(priv->dev, "EVENT: rssi high\n");
 347                 break;
 348         case MACREG_INT_CODE_SNR_HIGH:
 349                 netdev_alert(priv->dev, "EVENT: snr high\n");
 350                 break;
 351
 352         case MACREG_INT_CODE_MESH_AUTO_STARTED:
 353                 /* Ignore spurious autostart events */
 354                 netdev_info(priv->dev, "EVENT: MESH_AUTO_STARTED (ignoring)\n");
 355                 break;
 356
 357         default:
 358                 netdev_alert(priv->dev, "EVENT: unknown event id %d\n", event);
 359                 break;
 360         }
 361
 362         lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
 363         return ret;
 364 }