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