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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_get_last_tx_rate(struct wl1271 *wl, struct ieee80211_vif *vif,
struct ieee80211_tx_rate *rate)
{
u8 fw_rate = wl->fw_status->counters.tx_last_rate;
if (fw_rate > CONF_HW_RATE_INDEX_MAX) {
wl1271_error("last Tx rate invalid: %d", fw_rate);
rate->idx = 0;
rate->flags = 0;
return;
}
if (fw_rate <= CONF_HW_RATE_INDEX_54MBPS) {
rate->idx = fw_rate;
rate->flags = 0;
} else {
rate->flags = IEEE80211_TX_RC_MCS;
rate->idx = fw_rate - CONF_HW_RATE_INDEX_MCS0;
/* SGI modifier is counted as a separate rate */
if (fw_rate >= CONF_HW_RATE_INDEX_MCS7_SGI)
(rate->idx)--;
if (fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
(rate->idx)--;
/* this also covers the 40Mhz SGI case (= MCS15) */
if (fw_rate == CONF_HW_RATE_INDEX_MCS7_SGI ||
fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
rate->flags |= IEEE80211_TX_RC_SHORT_GI;
if (fw_rate > CONF_HW_RATE_INDEX_MCS7_SGI && vif) {
struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
if (wlvif->channel_type == NL80211_CHAN_HT40MINUS ||
wlvif->channel_type == NL80211_CHAN_HT40PLUS) {
/* adjustment needed for range 0-7 */
rate->idx -= 8;
rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
}
}
}
}
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;
/*
* first pass info->control.vif while it's valid, and then fill out
* the info->status structures
*/
wl18xx_get_last_tx_rate(wl, info->control.vif, &info->status.rates[0]);
info->status.rates[0].count = 1; /* no data about retries */
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->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;
}
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