189 lines
5.3 KiB
C
189 lines
5.3 KiB
C
/*
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* This file is part of wl18xx
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*
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* Copyright (C) 2011 Texas Instruments Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include "../wlcore/wlcore.h"
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#include "../wlcore/cmd.h"
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#include "../wlcore/debug.h"
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#include "../wlcore/acx.h"
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#include "../wlcore/tx.h"
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#include "wl18xx.h"
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#include "tx.h"
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static
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void wl18xx_get_last_tx_rate(struct wl1271 *wl, struct ieee80211_vif *vif,
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u8 band, struct ieee80211_tx_rate *rate, u8 hlid)
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{
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u8 fw_rate = wl->links[hlid].fw_rate_idx;
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if (fw_rate > CONF_HW_RATE_INDEX_MAX) {
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wl1271_error("last Tx rate invalid: %d", fw_rate);
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rate->idx = 0;
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rate->flags = 0;
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return;
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}
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if (fw_rate <= CONF_HW_RATE_INDEX_54MBPS) {
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rate->idx = fw_rate;
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if (band == NL80211_BAND_5GHZ)
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rate->idx -= CONF_HW_RATE_INDEX_6MBPS;
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rate->flags = 0;
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} else {
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rate->flags = IEEE80211_TX_RC_MCS;
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rate->idx = fw_rate - CONF_HW_RATE_INDEX_MCS0;
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/* SGI modifier is counted as a separate rate */
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if (fw_rate >= CONF_HW_RATE_INDEX_MCS7_SGI)
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(rate->idx)--;
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if (fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
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(rate->idx)--;
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/* this also covers the 40Mhz SGI case (= MCS15) */
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if (fw_rate == CONF_HW_RATE_INDEX_MCS7_SGI ||
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fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
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rate->flags |= IEEE80211_TX_RC_SHORT_GI;
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if (fw_rate > CONF_HW_RATE_INDEX_MCS7_SGI && vif) {
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struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
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if (wlvif->channel_type == NL80211_CHAN_HT40MINUS ||
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wlvif->channel_type == NL80211_CHAN_HT40PLUS) {
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/* adjustment needed for range 0-7 */
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rate->idx -= 8;
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rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
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}
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}
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}
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}
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static void wl18xx_tx_complete_packet(struct wl1271 *wl, u8 tx_stat_byte)
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{
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struct ieee80211_tx_info *info;
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struct sk_buff *skb;
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int id = tx_stat_byte & WL18XX_TX_STATUS_DESC_ID_MASK;
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bool tx_success;
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struct wl1271_tx_hw_descr *tx_desc;
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/* check for id legality */
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if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
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wl1271_warning("illegal id in tx completion: %d", id);
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return;
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}
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/* a zero bit indicates Tx success */
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tx_success = !(tx_stat_byte & BIT(WL18XX_TX_STATUS_STAT_BIT_IDX));
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skb = wl->tx_frames[id];
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info = IEEE80211_SKB_CB(skb);
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tx_desc = (struct wl1271_tx_hw_descr *)skb->data;
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if (wl12xx_is_dummy_packet(wl, skb)) {
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wl1271_free_tx_id(wl, id);
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return;
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}
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/* update the TX status info */
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if (tx_success && !(info->flags & IEEE80211_TX_CTL_NO_ACK))
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info->flags |= IEEE80211_TX_STAT_ACK;
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/*
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* first pass info->control.vif while it's valid, and then fill out
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* the info->status structures
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*/
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wl18xx_get_last_tx_rate(wl, info->control.vif,
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info->band,
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&info->status.rates[0],
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tx_desc->hlid);
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info->status.rates[0].count = 1; /* no data about retries */
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info->status.ack_signal = -1;
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if (!tx_success)
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wl->stats.retry_count++;
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/*
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* TODO: update sequence number for encryption? seems to be
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* unsupported for now. needed for recovery with encryption.
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*/
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/* remove private header from packet */
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skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
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/* remove TKIP header space if present */
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if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
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info->control.hw_key &&
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info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
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int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
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memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, hdrlen);
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skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
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}
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wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p success %d",
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id, skb, tx_success);
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/* return the packet to the stack */
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skb_queue_tail(&wl->deferred_tx_queue, skb);
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queue_work(wl->freezable_wq, &wl->netstack_work);
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wl1271_free_tx_id(wl, id);
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}
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void wl18xx_tx_immediate_complete(struct wl1271 *wl)
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{
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struct wl18xx_fw_status_priv *status_priv =
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(struct wl18xx_fw_status_priv *)wl->fw_status->priv;
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struct wl18xx_priv *priv = wl->priv;
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u8 i, hlid;
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/* nothing to do here */
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if (priv->last_fw_rls_idx == status_priv->fw_release_idx)
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return;
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/* update rates per link */
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hlid = wl->fw_status->counters.hlid;
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if (hlid < WLCORE_MAX_LINKS) {
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wl->links[hlid].fw_rate_idx =
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wl->fw_status->counters.tx_last_rate;
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wl->links[hlid].fw_rate_mbps =
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wl->fw_status->counters.tx_last_rate_mbps;
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}
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/* freed Tx descriptors */
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wl1271_debug(DEBUG_TX, "last released desc = %d, current idx = %d",
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priv->last_fw_rls_idx, status_priv->fw_release_idx);
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if (status_priv->fw_release_idx >= WL18XX_FW_MAX_TX_STATUS_DESC) {
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wl1271_error("invalid desc release index %d",
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status_priv->fw_release_idx);
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WARN_ON(1);
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return;
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}
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for (i = priv->last_fw_rls_idx;
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i != status_priv->fw_release_idx;
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i = (i + 1) % WL18XX_FW_MAX_TX_STATUS_DESC) {
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wl18xx_tx_complete_packet(wl,
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status_priv->released_tx_desc[i]);
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wl->tx_results_count++;
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}
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priv->last_fw_rls_idx = status_priv->fw_release_idx;
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}
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