tx.c

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/*
 * This file is part of wl18xx
 *
 * Copyright (C) 2011 Texas Instruments Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include "../wlcore/wlcore.h"
#include "../wlcore/cmd.h"
#include "../wlcore/debug.h"
#include "../wlcore/acx.h"
#include "../wlcore/tx.h"

#include "wl18xx.h"
#include "tx.h"

static void wl18xx_tx_complete_packet(struct wl1271 *wl, u8 tx_stat_byte)
{
    struct ieee80211_tx_info *info;
    struct sk_buff *skb;
    int id = tx_stat_byte & WL18XX_TX_STATUS_DESC_ID_MASK;
    bool tx_success;

    /* check for id legality */
    if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
        wl1271_warning("illegal id in tx completion: %d", id);
        return;
    }

    /* a zero bit indicates Tx success */
    tx_success = !(tx_stat_byte & BIT(WL18XX_TX_STATUS_STAT_BIT_IDX));


    skb = wl->tx_frames[id];
    info = IEEE80211_SKB_CB(skb);

    if (wl12xx_is_dummy_packet(wl, skb)) {
        wl1271_free_tx_id(wl, id);
        return;
    }

    /* update the TX status info */
    if (tx_success && !(info->flags & IEEE80211_TX_CTL_NO_ACK))
        info->flags |= IEEE80211_TX_STAT_ACK;

    /* no real data about Tx completion */
    info->status.rates[0].idx = -1;
    info->status.rates[0].count = 0;
    info->status.rates[0].flags = 0;
    info->status.ack_signal = -1;

    if (!tx_success)
        wl->stats.retry_count++;

    /*
     * TODO: update sequence number for encryption? seems to be
     * unsupported for now. needed for recovery with encryption.
     */

    /* remove private header from packet */
    skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));

    /* remove TKIP header space if present */
    if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
        info->control.hw_key &&
        info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
        int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
        memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, hdrlen);
        skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
    }

    wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p success %d",
             id, skb, tx_success);

    /* return the packet to the stack */
    skb_queue_tail(&wl->deferred_tx_queue, skb);
    queue_work(wl->freezable_wq, &wl->netstack_work);
    wl1271_free_tx_id(wl, id);
}

void wl18xx_tx_immediate_complete(struct wl1271 *wl)
{
    struct wl18xx_fw_status_priv *status_priv =
        (struct wl18xx_fw_status_priv *)wl->fw_status_2->priv;
    struct wl18xx_priv *priv = wl->priv;
    u8 i;

    /* nothing to do here */
    if (priv->last_fw_rls_idx == status_priv->fw_release_idx)
        return;

    /* freed Tx descriptors */
    wl1271_debug(DEBUG_TX, "last released desc = %d, current idx = %d",
             priv->last_fw_rls_idx, status_priv->fw_release_idx);

    if (status_priv->fw_release_idx >= WL18XX_FW_MAX_TX_STATUS_DESC) {
        wl1271_error("invalid desc release index %d",
                 status_priv->fw_release_idx);
        WARN_ON(1);
        return;
    }

    for (i = priv->last_fw_rls_idx;
         i != status_priv->fw_release_idx;
         i = (i + 1) % WL18XX_FW_MAX_TX_STATUS_DESC) {
        wl18xx_tx_complete_packet(wl,
            status_priv->released_tx_desc[i]);

        wl->tx_results_count++;
    }

    priv->last_fw_rls_idx = status_priv->fw_release_idx;
}