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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * This file contains the handling of command
   4  * responses as well as events generated by firmware.
   5  */
   6
   7 #include <linux/hardirq.h>
   8 #include <linux/slab.h>
   9 #include <linux/delay.h>
  10 #include <linux/sched.h>
  11 #include <asm/unaligned.h>
  12 #include <net/cfg80211.h>
  13
  14 #include "cfg.h"
  15 #include "cmd.h"
  16
  17 /**
  18  * lbs_mac_event_disconnected - handles disconnect event. It
  19  * reports disconnect to upper layer, clean tx/rx packets,
  20  * reset link state etc.
  21  *
  22  * @priv:       A pointer to struct lbs_private structure
  23  * @locally_generated: indicates disconnect was requested locally
  24  *              (usually by userspace)
  25  *
  26  * returns:     n/a
  27  */
  28 void lbs_mac_event_disconnected(struct lbs_private *priv,
  29                                 bool locally_generated)
  30 {
  31         unsigned long flags;
  32
  33         if (priv->connect_status != LBS_CONNECTED)
  34                 return;
  35
  36         /*
  37          * Cisco AP sends EAP failure and de-auth in less than 0.5 ms.
  38          * It causes problem in the Supplicant
  39          */
  40         msleep_interruptible(1000);
  41
  42         if (priv->wdev->iftype == NL80211_IFTYPE_STATION)
  43                 lbs_send_disconnect_notification(priv, locally_generated);
  44
  45         /* report disconnect to upper layer */
  46         netif_stop_queue(priv->dev);
  47         netif_carrier_off(priv->dev);
  48
  49         /* Free Tx and Rx packets */
  50         spin_lock_irqsave(&priv->driver_lock, flags);
  51         kfree_skb(priv->currenttxskb);
  52         priv->currenttxskb = NULL;
  53         priv->tx_pending_len = 0;
  54         spin_unlock_irqrestore(&priv->driver_lock, flags);
  55
  56         priv->connect_status = LBS_DISCONNECTED;
  57
  58         if (priv->psstate != PS_STATE_FULL_POWER) {
  59                 /* make firmware to exit PS mode */
  60                 lbs_deb_cmd("disconnected, so exit PS mode\n");
  61                 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
  62         }
  63 }
  64
  65 int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
  66 {
  67         uint16_t respcmd, curcmd;
  68         struct cmd_header *resp;
  69         int ret = 0;
  70         unsigned long flags;
  71         uint16_t result;
  72
  73         mutex_lock(&priv->lock);
  74         spin_lock_irqsave(&priv->driver_lock, flags);
  75
  76         if (!priv->cur_cmd) {
  77                 lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
  78                 ret = -1;
  79                 spin_unlock_irqrestore(&priv->driver_lock, flags);
  80                 goto done;
  81         }
  82
  83         resp = (void *)data;
  84         curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
  85         respcmd = le16_to_cpu(resp->command);
  86         result = le16_to_cpu(resp->result);
  87
  88         lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
  89                      respcmd, le16_to_cpu(resp->seqnum), len);
  90         lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);
  91
  92         if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
  93                 netdev_info(priv->dev,
  94                             "Received CMD_RESP with invalid sequence %d (expected %d)\n",
  95                             le16_to_cpu(resp->seqnum),
  96                             le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
  97                 spin_unlock_irqrestore(&priv->driver_lock, flags);
  98                 ret = -1;
  99                 goto done;
 100         }
 101         if (respcmd != CMD_RET(curcmd) &&
 102             respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
 103                 netdev_info(priv->dev, "Invalid CMD_RESP %x to command %x!\n",
 104                             respcmd, curcmd);
 105                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 106                 ret = -1;
 107                 goto done;
 108         }
 109
 110         if (resp->result == cpu_to_le16(0x0004)) {
 111                 /* 0x0004 means -EAGAIN. Drop the response, let it time out
 112                    and be resubmitted */
 113                 netdev_info(priv->dev,
 114                             "Firmware returns DEFER to command %x. Will let it time out...\n",
 115                             le16_to_cpu(resp->command));
 116                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 117                 ret = -1;
 118                 goto done;
 119         }
 120
 121         /* Now we got response from FW, cancel the command timer */
 122         del_timer(&priv->command_timer);
 123         priv->cmd_timed_out = 0;
 124
 125         if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
 126                 /* struct cmd_ds_802_11_ps_mode also contains
 127                  * the header
 128                  */
 129                 struct cmd_ds_802_11_ps_mode *psmode = (void *)resp;
 130                 u16 action = le16_to_cpu(psmode->action);
 131
 132                 lbs_deb_host(
 133                        "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
 134                        result, action);
 135
 136                 if (result) {
 137                         lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
 138                                     result);
 139                         /*
 140                          * We should not re-try enter-ps command in
 141                          * ad-hoc mode. It takes place in
 142                          * lbs_execute_next_command().
 143                          */
 144                         if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR &&
 145                             action == PS_MODE_ACTION_ENTER_PS)
 146                                 priv->psmode = LBS802_11POWERMODECAM;
 147                 } else if (action == PS_MODE_ACTION_ENTER_PS) {
 148                         priv->needtowakeup = 0;
 149                         priv->psstate = PS_STATE_AWAKE;
 150
 151                         lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
 152                         if (priv->connect_status != LBS_CONNECTED) {
 153                                 /*
 154                                  * When Deauth Event received before Enter_PS command
 155                                  * response, We need to wake up the firmware.
 156                                  */
 157                                 lbs_deb_host(
 158                                        "disconnected, invoking lbs_ps_wakeup\n");
 159
 160                                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 161                                 mutex_unlock(&priv->lock);
 162                                 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS,
 163                                                 false);
 164                                 mutex_lock(&priv->lock);
 165                                 spin_lock_irqsave(&priv->driver_lock, flags);
 166                         }
 167                 } else if (action == PS_MODE_ACTION_EXIT_PS) {
 168                         priv->needtowakeup = 0;
 169                         priv->psstate = PS_STATE_FULL_POWER;
 170                         lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
 171                 } else {
 172                         lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
 173                 }
 174
 175                 __lbs_complete_command(priv, priv->cur_cmd, result);
 176                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 177
 178                 ret = 0;
 179                 goto done;
 180         }
 181
 182         /* If the command is not successful, cleanup and return failure */
 183         if ((result != 0 || !(respcmd & 0x8000))) {
 184                 lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
 185                        result, respcmd);
 186                 /*
 187                  * Handling errors here
 188                  */
 189                 switch (respcmd) {
 190                 case CMD_RET(CMD_GET_HW_SPEC):
 191                 case CMD_RET(CMD_802_11_RESET):
 192                         lbs_deb_host("CMD_RESP: reset failed\n");
 193                         break;
 194
 195                 }
 196                 __lbs_complete_command(priv, priv->cur_cmd, result);
 197                 spin_unlock_irqrestore(&priv->driver_lock, flags);
 198
 199                 ret = -1;
 200                 goto done;
 201         }
 202
 203         spin_unlock_irqrestore(&priv->driver_lock, flags);
 204
 205         if (priv->cur_cmd && priv->cur_cmd->callback) {
 206                 ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
 207                                 resp);
 208         }
 209
 210         spin_lock_irqsave(&priv->driver_lock, flags);
 211
 212         if (priv->cur_cmd) {
 213                 /* Clean up and Put current command back to cmdfreeq */
 214                 __lbs_complete_command(priv, priv->cur_cmd, result);
 215         }
 216         spin_unlock_irqrestore(&priv->driver_lock, flags);
 217
 218 done:
 219         mutex_unlock(&priv->lock);
 220         return ret;
 221 }
 222
 223 int lbs_process_event(struct lbs_private *priv, u32 event)
 224 {
 225         int ret = 0;
 226         struct cmd_header cmd;
 227
 228         switch (event) {
 229         case MACREG_INT_CODE_LINK_SENSED:
 230                 lbs_deb_cmd("EVENT: link sensed\n");
 231                 break;
 232
 233         case MACREG_INT_CODE_DEAUTHENTICATED:
 234                 lbs_deb_cmd("EVENT: deauthenticated\n");
 235                 lbs_mac_event_disconnected(priv, false);
 236                 break;
 237
 238         case MACREG_INT_CODE_DISASSOCIATED:
 239                 lbs_deb_cmd("EVENT: disassociated\n");
 240                 lbs_mac_event_disconnected(priv, false);
 241                 break;
 242
 243         case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
 244                 lbs_deb_cmd("EVENT: link lost\n");
 245                 lbs_mac_event_disconnected(priv, true);
 246                 break;
 247
 248         case MACREG_INT_CODE_PS_SLEEP:
 249                 lbs_deb_cmd("EVENT: ps sleep\n");
 250
 251                 /* handle unexpected PS SLEEP event */
 252                 if (priv->psstate == PS_STATE_FULL_POWER) {
 253                         lbs_deb_cmd(
 254                                "EVENT: in FULL POWER mode, ignoring PS_SLEEP\n");
 255                         break;
 256                 }
 257                 if (!list_empty(&priv->cmdpendingq)) {
 258                         lbs_deb_cmd("EVENT: commands in queue, do not sleep\n");
 259                         break;
 260                 }
 261                 priv->psstate = PS_STATE_PRE_SLEEP;
 262
 263                 lbs_ps_confirm_sleep(priv);
 264
 265                 break;
 266
 267         case MACREG_INT_CODE_HOST_AWAKE:
 268                 lbs_deb_cmd("EVENT: host awake\n");
 269                 if (priv->reset_deep_sleep_wakeup)
 270                         priv->reset_deep_sleep_wakeup(priv);
 271                 priv->is_deep_sleep = 0;
 272                 lbs_cmd_async(priv, CMD_802_11_WAKEUP_CONFIRM, &cmd,
 273                                 sizeof(cmd));
 274                 priv->is_host_sleep_activated = 0;
 275                 wake_up_interruptible(&priv->host_sleep_q);
 276                 break;
 277
 278         case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
 279                 if (priv->reset_deep_sleep_wakeup)
 280                         priv->reset_deep_sleep_wakeup(priv);
 281                 lbs_deb_cmd("EVENT: ds awake\n");
 282                 priv->is_deep_sleep = 0;
 283                 priv->wakeup_dev_required = 0;
 284                 wake_up_interruptible(&priv->ds_awake_q);
 285                 break;
 286
 287         case MACREG_INT_CODE_PS_AWAKE:
 288                 lbs_deb_cmd("EVENT: ps awake\n");
 289                 /* handle unexpected PS AWAKE event */
 290                 if (priv->psstate == PS_STATE_FULL_POWER) {
 291                         lbs_deb_cmd(
 292                                "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
 293                         break;
 294                 }
 295
 296                 priv->psstate = PS_STATE_AWAKE;
 297
 298                 if (priv->needtowakeup) {
 299                         /*
 300                          * wait for the command processing to finish
 301                          * before resuming sending
 302                          * priv->needtowakeup will be set to FALSE
 303                          * in lbs_ps_wakeup()
 304                          */
 305                         lbs_deb_cmd("waking up ...\n");
 306                         lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
 307                 }
 308                 break;
 309
 310         case MACREG_INT_CODE_MIC_ERR_UNICAST:
 311                 lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
 312                 lbs_send_mic_failureevent(priv, event);
 313                 break;
 314
 315         case MACREG_INT_CODE_MIC_ERR_MULTICAST:
 316                 lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
 317                 lbs_send_mic_failureevent(priv, event);
 318                 break;
 319
 320         case MACREG_INT_CODE_MIB_CHANGED:
 321                 lbs_deb_cmd("EVENT: MIB CHANGED\n");
 322                 break;
 323         case MACREG_INT_CODE_INIT_DONE:
 324                 lbs_deb_cmd("EVENT: INIT DONE\n");
 325                 break;
 326         case MACREG_INT_CODE_ADHOC_BCN_LOST:
 327                 lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
 328                 break;
 329         case MACREG_INT_CODE_RSSI_LOW:
 330                 netdev_alert(priv->dev, "EVENT: rssi low\n");
 331                 break;
 332         case MACREG_INT_CODE_SNR_LOW:
 333                 netdev_alert(priv->dev, "EVENT: snr low\n");
 334                 break;
 335         case MACREG_INT_CODE_MAX_FAIL:
 336                 netdev_alert(priv->dev, "EVENT: max fail\n");
 337                 break;
 338         case MACREG_INT_CODE_RSSI_HIGH:
 339                 netdev_alert(priv->dev, "EVENT: rssi high\n");
 340                 break;
 341         case MACREG_INT_CODE_SNR_HIGH:
 342                 netdev_alert(priv->dev, "EVENT: snr high\n");
 343                 break;
 344
 345         case MACREG_INT_CODE_MESH_AUTO_STARTED:
 346                 /* Ignore spurious autostart events */
 347                 netdev_info(priv->dev, "EVENT: MESH_AUTO_STARTED (ignoring)\n");
 348                 break;
 349
 350         default:
 351                 netdev_alert(priv->dev, "EVENT: unknown event id %d\n", event);
 352                 break;
 353         }
 354
 355         return ret;
 356 }