cmdresp.c

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/*
 * 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 <asm/unaligned.h>
#include <net/cfg80211.h>

#include "cfg.h"
#include "cmd.h"

void lbs_mac_event_disconnected(struct lbs_private *priv)
{
    if (priv->connect_status != LBS_CONNECTED)
        return;

    lbs_deb_enter(LBS_DEB_ASSOC);

    /*
     * 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);

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

    /* Free Tx and Rx packets */
    kfree_skb(priv->currenttxskb);
    priv->currenttxskb = NULL;
    priv->tx_pending_len = 0;

    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);
    }
    lbs_deb_leave(LBS_DEB_ASSOC);
}

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;

    lbs_deb_enter(LBS_DEB_HOST);

    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 */
    del_timer(&priv->command_timer);
    priv->cmd_timed_out = 0;

    if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
        struct cmd_ds_802_11_ps_mode *psmode = (void *) &resp[1];
        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);
    lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
    return ret;
}

int lbs_process_event(struct lbs_private *priv, u32 event)
{
    int ret = 0;
    struct cmd_header cmd;

    lbs_deb_enter(LBS_DEB_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);
        break;

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

    case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
        lbs_deb_cmd("EVENT: link lost\n");
        lbs_mac_event_disconnected(priv);
        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, ignoreing PS_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;
        priv->wakeup_dev_required = 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;
    }

    lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
    return ret;
}