txrx.c

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/*
 * Marvell Wireless LAN device driver: generic TX/RX data handling
 *
 * 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"

/*
 * This function processes the received buffer.
 *
 * Main responsibility of this function is to parse the RxPD to
 * identify the correct interface this packet is headed for and
 * forwarding it to the associated handling function, where the
 * packet will be further processed and sent to kernel/upper layer
 * if required.
 */
int mwifiex_handle_rx_packet(struct mwifiex_adapter *adapter,
                 struct sk_buff *skb)
{
    struct mwifiex_private *priv =
        mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
    struct rxpd *local_rx_pd;
    struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);

    local_rx_pd = (struct rxpd *) (skb->data);
    /* Get the BSS number from rxpd, get corresponding priv */
    priv = mwifiex_get_priv_by_id(adapter, local_rx_pd->bss_num &
                      BSS_NUM_MASK, local_rx_pd->bss_type);
    if (!priv)
        priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);

    rx_info->bss_num = priv->bss_num;
    rx_info->bss_type = priv->bss_type;

    if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
        return mwifiex_process_uap_rx_packet(adapter, skb);

    return mwifiex_process_sta_rx_packet(adapter, skb);
}
EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet);

/*
 * This function sends a packet to device.
 *
 * It processes the packet to add the TxPD, checks condition and
 * sends the processed packet to firmware for transmission.
 *
 * On successful completion, the function calls the completion callback
 * and logs the time.
 */
int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
               struct mwifiex_tx_param *tx_param)
{
    int ret = -1;
    struct mwifiex_adapter *adapter = priv->adapter;
    u8 *head_ptr;
    struct txpd *local_tx_pd = NULL;

    if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
        head_ptr = mwifiex_process_uap_txpd(priv, skb);
    else
        head_ptr = mwifiex_process_sta_txpd(priv, skb);

    if (head_ptr) {
        if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
            local_tx_pd =
                (struct txpd *) (head_ptr + INTF_HEADER_LEN);
        if (adapter->iface_type == MWIFIEX_USB) {
            adapter->data_sent = true;
            skb_pull(skb, INTF_HEADER_LEN);
            ret = adapter->if_ops.host_to_card(adapter,
                               MWIFIEX_USB_EP_DATA,
                               skb, NULL);
        } else {
            ret = adapter->if_ops.host_to_card(adapter,
                               MWIFIEX_TYPE_DATA,
                               skb, tx_param);
        }
    }

    switch (ret) {
    case -ENOSR:
        dev_err(adapter->dev, "data: -ENOSR is returned\n");
        break;
    case -EBUSY:
        if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
            (adapter->pps_uapsd_mode) && (adapter->tx_lock_flag)) {
                priv->adapter->tx_lock_flag = false;
                if (local_tx_pd)
                    local_tx_pd->flags = 0;
        }
        dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
        break;
    case -1:
        adapter->data_sent = false;
        dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
            ret);
        adapter->dbg.num_tx_host_to_card_failure++;
        mwifiex_write_data_complete(adapter, skb, ret);
        break;
    case -EINPROGRESS:
        adapter->data_sent = false;
        break;
    case 0:
        mwifiex_write_data_complete(adapter, skb, ret);
        break;
    default:
        break;
    }

    return ret;
}

/*
 * Packet send completion callback handler.
 *
 * It either frees the buffer directly or forwards it to another
 * completion callback which checks conditions, updates statistics,
 * wakes up stalled traffic queue if required, and then frees the buffer.
 */
int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
                struct sk_buff *skb, int status)
{
    struct mwifiex_private *priv, *tpriv;
    struct mwifiex_txinfo *tx_info;
    int i;

    if (!skb)
        return 0;

    tx_info = MWIFIEX_SKB_TXCB(skb);
    priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
                      tx_info->bss_type);
    if (!priv)
        goto done;

    if (adapter->iface_type == MWIFIEX_USB)
        adapter->data_sent = false;

    mwifiex_set_trans_start(priv->netdev);
    if (!status) {
        priv->stats.tx_packets++;
        priv->stats.tx_bytes += skb->len;
    } else {
        priv->stats.tx_errors++;
    }

    if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT)
        atomic_dec_return(&adapter->pending_bridged_pkts);
    if (atomic_dec_return(&adapter->tx_pending) >= LOW_TX_PENDING)
        goto done;

    for (i = 0; i < adapter->priv_num; i++) {
        tpriv = adapter->priv[i];

        if (tpriv->media_connected &&
            netif_queue_stopped(tpriv->netdev))
            mwifiex_wake_up_net_dev_queue(tpriv->netdev, adapter);
    }
done:
    dev_kfree_skb_any(skb);

    return 0;
}
EXPORT_SYMBOL_GPL(mwifiex_write_data_complete);