Quelle  cmdresp.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * This file contains the handling of command
 * responses as well as events generated by firmware.
 */

#include <linux/hardirq.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/unaligned.h>
#include <net/cfg80211.h>

#include "cfg.h"
#include "cmd.h"

/**
 * lbs_mac_event_disconnected - handles disconnect event. It
 * reports disconnect to upper layer, clean tx/rx packets,
 * reset link state etc.
 *
 * @priv: A pointer to struct lbs_private structure
 * @locally_generated: indicates disconnect was requested locally
 * (usually by userspace)
 *
 * returns: n/a
 */
void lbs_mac_event_disconnected(struct lbs_private *priv,
    bool locally_generated)
{
 unsigned long flags;

 if (priv->connect_status != LBS_CONNECTED)
  return;

 /*
 * Cisco AP sends EAP failure and de-auth in less than 0.5 ms.
 * It causes problem in the Supplicant
 */
 msleep_interruptible(1000);

 if (priv->wdev->iftype == NL80211_IFTYPE_STATION)
  lbs_send_disconnect_notification(priv, locally_generated);

 /* report disconnect to upper layer */
 netif_stop_queue(priv->dev);
 netif_carrier_off(priv->dev);

 /* Free Tx and Rx packets */
 spin_lock_irqsave(&priv->driver_lock, flags);
 dev_kfree_skb_irq(priv->currenttxskb);
 priv->currenttxskb = NULL;
 priv->tx_pending_len = 0;
 spin_unlock_irqrestore(&priv->driver_lock, flags);

 priv->connect_status = LBS_DISCONNECTED;

 if (priv->psstate != PS_STATE_FULL_POWER) {
  /* make firmware to exit PS mode */
  lbs_deb_cmd("disconnected, so exit PS mode\n");
  lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
 }
}

int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
{
 uint16_t respcmd, curcmd;
 struct cmd_header *resp;
 int ret = 0;
 unsigned long flags;
 uint16_t result;

 mutex_lock(&priv->lock);
 spin_lock_irqsave(&priv->driver_lock, flags);

 if (!priv->cur_cmd) {
  lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
  ret = -1;
  spin_unlock_irqrestore(&priv->driver_lock, flags);
  goto done;
 }

 resp = (void *)data;
 curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
 respcmd = le16_to_cpu(resp->command);
 result = le16_to_cpu(resp->result);

 lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
       respcmd, le16_to_cpu(resp->seqnum), len);
 lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);

 if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
  netdev_info(priv->dev,
       "Received CMD_RESP with invalid sequence %d (expected %d)\n",
       le16_to_cpu(resp->seqnum),
       le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
  spin_unlock_irqrestore(&priv->driver_lock, flags);
  ret = -1;
  goto done;
 }
 if (respcmd != CMD_RET(curcmd) &&
     respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
  netdev_info(priv->dev, "Invalid CMD_RESP %x to command %x!\n",
       respcmd, curcmd);
  spin_unlock_irqrestore(&priv->driver_lock, flags);
  ret = -1;
  goto done;
 }

 if (resp->result == cpu_to_le16(0x0004)) {
  /* 0x0004 means -EAGAIN. Drop the response, let it time out
   and be resubmitted */
  netdev_info(priv->dev,
       "Firmware returns DEFER to command %x. Will let it time out...\n",
       le16_to_cpu(resp->command));
  spin_unlock_irqrestore(&priv->driver_lock, flags);
  ret = -1;
  goto done;
 }

 /* Now we got response from FW, cancel the command timer */
 timer_delete(&priv->command_timer);
 priv->cmd_timed_out = 0;

 if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
  /* struct cmd_ds_802_11_ps_mode also contains
 * the header
 */
  struct cmd_ds_802_11_ps_mode *psmode = (void *)resp;
  u16 action = le16_to_cpu(psmode->action);

  lbs_deb_host(
         "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
         result, action);

  if (result) {
   lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
        result);
   /*
 * We should not re-try enter-ps command in
 * ad-hoc mode. It takes place in
 * lbs_execute_next_command().
 */
   if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR &&
       action == PS_MODE_ACTION_ENTER_PS)
    priv->psmode = LBS802_11POWERMODECAM;
  } else if (action == PS_MODE_ACTION_ENTER_PS) {
   priv->needtowakeup = 0;
   priv->psstate = PS_STATE_AWAKE;

   lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
   if (priv->connect_status != LBS_CONNECTED) {
    /*
 * When Deauth Event received before Enter_PS command
 * response, We need to wake up the firmware.
 */
    lbs_deb_host(
           "disconnected, invoking lbs_ps_wakeup\n");

    spin_unlock_irqrestore(&priv->driver_lock, flags);
    mutex_unlock(&priv->lock);
    lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS,
      false);
    mutex_lock(&priv->lock);
    spin_lock_irqsave(&priv->driver_lock, flags);
   }
  } else if (action == PS_MODE_ACTION_EXIT_PS) {
   priv->needtowakeup = 0;
   priv->psstate = PS_STATE_FULL_POWER;
   lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
  } else {
   lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
  }

  __lbs_complete_command(priv, priv->cur_cmd, result);
  spin_unlock_irqrestore(&priv->driver_lock, flags);

  ret = 0;
  goto done;
 }

 /* If the command is not successful, cleanup and return failure */
 if ((result != 0 || !(respcmd & 0x8000))) {
  lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
         result, respcmd);
  /*
 * Handling errors here
 */
  switch (respcmd) {
  case CMD_RET(CMD_GET_HW_SPEC):
  case CMD_RET(CMD_802_11_RESET):
   lbs_deb_host("CMD_RESP: reset failed\n");
   break;

  }
  __lbs_complete_command(priv, priv->cur_cmd, result);
  spin_unlock_irqrestore(&priv->driver_lock, flags);

  ret = -1;
  goto done;
 }

 spin_unlock_irqrestore(&priv->driver_lock, flags);

 if (priv->cur_cmd && priv->cur_cmd->callback) {
  ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
    resp);
 }

 spin_lock_irqsave(&priv->driver_lock, flags);

 if (priv->cur_cmd) {
  /* Clean up and Put current command back to cmdfreeq */
  __lbs_complete_command(priv, priv->cur_cmd, result);
 }
 spin_unlock_irqrestore(&priv->driver_lock, flags);

done:
 mutex_unlock(&priv->lock);
 return ret;
}

void lbs_process_event(struct lbs_private *priv, u32 event)
{
 struct cmd_header cmd;

 switch (event) {
 case MACREG_INT_CODE_LINK_SENSED:
  lbs_deb_cmd("EVENT: link sensed\n");
  break;

 case MACREG_INT_CODE_DEAUTHENTICATED:
  lbs_deb_cmd("EVENT: deauthenticated\n");
  lbs_mac_event_disconnected(priv, false);
  break;

 case MACREG_INT_CODE_DISASSOCIATED:
  lbs_deb_cmd("EVENT: disassociated\n");
  lbs_mac_event_disconnected(priv, false);
  break;

 case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
  lbs_deb_cmd("EVENT: link lost\n");
  lbs_mac_event_disconnected(priv, true);
  break;

 case MACREG_INT_CODE_PS_SLEEP:
  lbs_deb_cmd("EVENT: ps sleep\n");

  /* handle unexpected PS SLEEP event */
  if (priv->psstate == PS_STATE_FULL_POWER) {
   lbs_deb_cmd(
          "EVENT: in FULL POWER mode, ignoring PS_SLEEP\n");
   break;
  }
  if (!list_empty(&priv->cmdpendingq)) {
   lbs_deb_cmd("EVENT: commands in queue, do not sleep\n");
   break;
  }
  priv->psstate = PS_STATE_PRE_SLEEP;

  lbs_ps_confirm_sleep(priv);

  break;

 case MACREG_INT_CODE_HOST_AWAKE:
  lbs_deb_cmd("EVENT: host awake\n");
  if (priv->reset_deep_sleep_wakeup)
   priv->reset_deep_sleep_wakeup(priv);
  priv->is_deep_sleep = 0;
  lbs_cmd_async(priv, CMD_802_11_WAKEUP_CONFIRM, &cmd,
    sizeof(cmd));
  priv->is_host_sleep_activated = 0;
  wake_up_interruptible(&priv->host_sleep_q);
  break;

 case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
  if (priv->reset_deep_sleep_wakeup)
   priv->reset_deep_sleep_wakeup(priv);
  lbs_deb_cmd("EVENT: ds awake\n");
  priv->is_deep_sleep = 0;
  wake_up_interruptible(&priv->ds_awake_q);
  break;

 case MACREG_INT_CODE_PS_AWAKE:
  lbs_deb_cmd("EVENT: ps awake\n");
  /* handle unexpected PS AWAKE event */
  if (priv->psstate == PS_STATE_FULL_POWER) {
   lbs_deb_cmd(
          "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
   break;
  }

  priv->psstate = PS_STATE_AWAKE;

  if (priv->needtowakeup) {
   /*
 * wait for the command processing to finish
 * before resuming sending
 * priv->needtowakeup will be set to FALSE
 * in lbs_ps_wakeup()
 */
   lbs_deb_cmd("waking up ...\n");
   lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
  }
  break;

 case MACREG_INT_CODE_MIC_ERR_UNICAST:
  lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
  lbs_send_mic_failureevent(priv, event);
  break;

 case MACREG_INT_CODE_MIC_ERR_MULTICAST:
  lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
  lbs_send_mic_failureevent(priv, event);
  break;

 case MACREG_INT_CODE_MIB_CHANGED:
  lbs_deb_cmd("EVENT: MIB CHANGED\n");
  break;
 case MACREG_INT_CODE_INIT_DONE:
  lbs_deb_cmd("EVENT: INIT DONE\n");
  break;
 case MACREG_INT_CODE_ADHOC_BCN_LOST:
  lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
  break;
 case MACREG_INT_CODE_RSSI_LOW:
  netdev_alert(priv->dev, "EVENT: rssi low\n");
  break;
 case MACREG_INT_CODE_SNR_LOW:
  netdev_alert(priv->dev, "EVENT: snr low\n");
  break;
 case MACREG_INT_CODE_MAX_FAIL:
  netdev_alert(priv->dev, "EVENT: max fail\n");
  break;
 case MACREG_INT_CODE_RSSI_HIGH:
  netdev_alert(priv->dev, "EVENT: rssi high\n");
  break;
 case MACREG_INT_CODE_SNR_HIGH:
  netdev_alert(priv->dev, "EVENT: snr high\n");
  break;

 case MACREG_INT_CODE_MESH_AUTO_STARTED:
  /* Ignore spurious autostart events */
  netdev_info(priv->dev, "EVENT: MESH_AUTO_STARTED (ignoring)\n");
  break;

 default:
  netdev_alert(priv->dev, "EVENT: unknown event id %d\n", event);
  break;
 }
}