util.c

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/*
 * Marvell Wireless LAN device driver: utility functions
 *
 * Copyright (C) 2011, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"
#include "11n.h"

/*
 * Firmware initialization complete callback handler.
 *
 * This function wakes up the function waiting on the init
 * wait queue for the firmware initialization to complete.
 */
int mwifiex_init_fw_complete(struct mwifiex_adapter *adapter)
{

    adapter->init_wait_q_woken = true;
    wake_up_interruptible(&adapter->init_wait_q);
    return 0;
}

/*
 * Firmware shutdown complete callback handler.
 *
 * This function sets the hardware status to not ready and wakes up
 * the function waiting on the init wait queue for the firmware
 * shutdown to complete.
 */
int mwifiex_shutdown_fw_complete(struct mwifiex_adapter *adapter)
{
    adapter->hw_status = MWIFIEX_HW_STATUS_NOT_READY;
    adapter->init_wait_q_woken = true;
    wake_up_interruptible(&adapter->init_wait_q);
    return 0;
}

/*
 * This function sends init/shutdown command
 * to firmware.
 */
int mwifiex_init_shutdown_fw(struct mwifiex_private *priv,
                 u32 func_init_shutdown)
{
    u16 cmd;

    if (func_init_shutdown == MWIFIEX_FUNC_INIT) {
        cmd = HostCmd_CMD_FUNC_INIT;
    } else if (func_init_shutdown == MWIFIEX_FUNC_SHUTDOWN) {
        cmd = HostCmd_CMD_FUNC_SHUTDOWN;
    } else {
        dev_err(priv->adapter->dev, "unsupported parameter\n");
        return -1;
    }

    return mwifiex_send_cmd_sync(priv, cmd, HostCmd_ACT_GEN_SET, 0, NULL);
}
EXPORT_SYMBOL_GPL(mwifiex_init_shutdown_fw);

/*
 * IOCTL request handler to set/get debug information.
 *
 * This function collates/sets the information from/to different driver
 * structures.
 */
int mwifiex_get_debug_info(struct mwifiex_private *priv,
               struct mwifiex_debug_info *info)
{
    struct mwifiex_adapter *adapter = priv->adapter;

    if (info) {
        memcpy(info->packets_out,
               priv->wmm.packets_out,
               sizeof(priv->wmm.packets_out));
        info->max_tx_buf_size = (u32) adapter->max_tx_buf_size;
        info->tx_buf_size = (u32) adapter->tx_buf_size;
        info->rx_tbl_num = mwifiex_get_rx_reorder_tbl(priv,
                                  info->rx_tbl);
        info->tx_tbl_num = mwifiex_get_tx_ba_stream_tbl(priv,
                                info->tx_tbl);
        info->ps_mode = adapter->ps_mode;
        info->ps_state = adapter->ps_state;
        info->is_deep_sleep = adapter->is_deep_sleep;
        info->pm_wakeup_card_req = adapter->pm_wakeup_card_req;
        info->pm_wakeup_fw_try = adapter->pm_wakeup_fw_try;
        info->is_hs_configured = adapter->is_hs_configured;
        info->hs_activated = adapter->hs_activated;
        info->num_cmd_host_to_card_failure
                = adapter->dbg.num_cmd_host_to_card_failure;
        info->num_cmd_sleep_cfm_host_to_card_failure
            = adapter->dbg.num_cmd_sleep_cfm_host_to_card_failure;
        info->num_tx_host_to_card_failure
                = adapter->dbg.num_tx_host_to_card_failure;
        info->num_event_deauth = adapter->dbg.num_event_deauth;
        info->num_event_disassoc = adapter->dbg.num_event_disassoc;
        info->num_event_link_lost = adapter->dbg.num_event_link_lost;
        info->num_cmd_deauth = adapter->dbg.num_cmd_deauth;
        info->num_cmd_assoc_success =
                    adapter->dbg.num_cmd_assoc_success;
        info->num_cmd_assoc_failure =
                    adapter->dbg.num_cmd_assoc_failure;
        info->num_tx_timeout = adapter->dbg.num_tx_timeout;
        info->num_cmd_timeout = adapter->dbg.num_cmd_timeout;
        info->timeout_cmd_id = adapter->dbg.timeout_cmd_id;
        info->timeout_cmd_act = adapter->dbg.timeout_cmd_act;
        memcpy(info->last_cmd_id, adapter->dbg.last_cmd_id,
               sizeof(adapter->dbg.last_cmd_id));
        memcpy(info->last_cmd_act, adapter->dbg.last_cmd_act,
               sizeof(adapter->dbg.last_cmd_act));
        info->last_cmd_index = adapter->dbg.last_cmd_index;
        memcpy(info->last_cmd_resp_id, adapter->dbg.last_cmd_resp_id,
               sizeof(adapter->dbg.last_cmd_resp_id));
        info->last_cmd_resp_index = adapter->dbg.last_cmd_resp_index;
        memcpy(info->last_event, adapter->dbg.last_event,
               sizeof(adapter->dbg.last_event));
        info->last_event_index = adapter->dbg.last_event_index;
        info->data_sent = adapter->data_sent;
        info->cmd_sent = adapter->cmd_sent;
        info->cmd_resp_received = adapter->cmd_resp_received;
    }

    return 0;
}

/*
 * This function processes the received management packet and send it
 * to the kernel.
 */
int
mwifiex_process_mgmt_packet(struct mwifiex_adapter *adapter,
                struct sk_buff *skb)
{
    struct rxpd *rx_pd;
    struct mwifiex_private *priv;
    u16 pkt_len;

    if (!skb)
        return -1;

    rx_pd = (struct rxpd *)skb->data;
    priv = mwifiex_get_priv_by_id(adapter, rx_pd->bss_num, rx_pd->bss_type);
    if (!priv)
        return -1;

    skb_pull(skb, le16_to_cpu(rx_pd->rx_pkt_offset));
    skb_pull(skb, sizeof(pkt_len));

    pkt_len = le16_to_cpu(rx_pd->rx_pkt_length);

    /* Remove address4 */
    memmove(skb->data + sizeof(struct ieee80211_hdr_3addr),
        skb->data + sizeof(struct ieee80211_hdr),
        pkt_len - sizeof(struct ieee80211_hdr));

    pkt_len -= ETH_ALEN + sizeof(pkt_len);
    rx_pd->rx_pkt_length = cpu_to_le16(pkt_len);

    cfg80211_rx_mgmt(priv->wdev, priv->roc_cfg.chan.center_freq,
             CAL_RSSI(rx_pd->snr, rx_pd->nf),
             skb->data, pkt_len, GFP_ATOMIC);

    return 0;
}

/*
 * This function processes the received packet before sending it to the
 * kernel.
 *
 * It extracts the SKB from the received buffer and sends it to kernel.
 * In case the received buffer does not contain the data in SKB format,
 * the function creates a blank SKB, fills it with the data from the
 * received buffer and then sends this new SKB to the kernel.
 */
int mwifiex_recv_packet(struct mwifiex_adapter *adapter, struct sk_buff *skb)
{
    struct mwifiex_rxinfo *rx_info;
    struct mwifiex_private *priv;

    if (!skb)
        return -1;

    rx_info = MWIFIEX_SKB_RXCB(skb);
    priv = mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
                      rx_info->bss_type);
    if (!priv)
        return -1;

    skb->dev = priv->netdev;
    skb->protocol = eth_type_trans(skb, priv->netdev);
    skb->ip_summed = CHECKSUM_NONE;

    /* This is required only in case of 11n and USB as we alloc
     * a buffer of 4K only if its 11N (to be able to receive 4K
     * AMSDU packets). In case of SD we allocate buffers based
     * on the size of packet and hence this is not needed.
     *
     * Modifying the truesize here as our allocation for each
     * skb is 4K but we only receive 2K packets and this cause
     * the kernel to start dropping packets in case where
     * application has allocated buffer based on 2K size i.e.
     * if there a 64K packet received (in IP fragments and
     * application allocates 64K to receive this packet but
     * this packet would almost double up because we allocate
     * each 1.5K fragment in 4K and pass it up. As soon as the
     * 64K limit hits kernel will start to drop rest of the
     * fragments. Currently we fail the Filesndl-ht.scr script
     * for UDP, hence this fix
     */
    if ((adapter->iface_type == MWIFIEX_USB) &&
        (skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE))
        skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE);

    priv->stats.rx_bytes += skb->len;
    priv->stats.rx_packets++;
    if (in_interrupt())
        netif_rx(skb);
    else
        netif_rx_ni(skb);

    return 0;
}

/*
 * IOCTL completion callback handler.
 *
 * This function is called when a pending IOCTL is completed.
 *
 * If work queue support is enabled, the function wakes up the
 * corresponding waiting function. Otherwise, it processes the
 * IOCTL response and frees the response buffer.
 */
int mwifiex_complete_cmd(struct mwifiex_adapter *adapter,
             struct cmd_ctrl_node *cmd_node)
{
    atomic_dec(&adapter->cmd_pending);
    dev_dbg(adapter->dev, "cmd completed: status=%d\n",
        adapter->cmd_wait_q.status);

    *(cmd_node->condition) = true;

    if (adapter->cmd_wait_q.status == -ETIMEDOUT)
        dev_err(adapter->dev, "cmd timeout\n");
    else
        wake_up_interruptible(&adapter->cmd_wait_q.wait);

    return 0;
}