drivers/net/wireless/ti/wl18xx/tx.c

   1 /*
   2  * This file is part of wl18xx
   3  *
   4  * Copyright (C) 2011 Texas Instruments Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  18  * 02110-1301 USA
  19  *
  20  */
  21
  22 #include "../wlcore/wlcore.h"
  23 #include "../wlcore/cmd.h"
  24 #include "../wlcore/debug.h"
  25 #include "../wlcore/acx.h"
  26 #include "../wlcore/tx.h"
  27
  28 #include "wl18xx.h"
  29 #include "tx.h"
  30
  31 static
  32 void wl18xx_get_last_tx_rate(struct wl1271 *wl, struct ieee80211_vif *vif,
  33                              u8 band, struct ieee80211_tx_rate *rate)
  34 {
  35         u8 fw_rate = wl->fw_status->counters.tx_last_rate;
  36
  37         if (fw_rate > CONF_HW_RATE_INDEX_MAX) {
  38                 wl1271_error("last Tx rate invalid: %d", fw_rate);
  39                 rate->idx = 0;
  40                 rate->flags = 0;
  41                 return;
  42         }
  43
  44         if (fw_rate <= CONF_HW_RATE_INDEX_54MBPS) {
  45                 rate->idx = fw_rate;
  46                 if (band == NL80211_BAND_5GHZ)
  47                         rate->idx -= CONF_HW_RATE_INDEX_6MBPS;
  48                 rate->flags = 0;
  49         } else {
  50                 rate->flags = IEEE80211_TX_RC_MCS;
  51                 rate->idx = fw_rate - CONF_HW_RATE_INDEX_MCS0;
  52
  53                 /* SGI modifier is counted as a separate rate */
  54                 if (fw_rate >= CONF_HW_RATE_INDEX_MCS7_SGI)
  55                         (rate->idx)--;
  56                 if (fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
  57                         (rate->idx)--;
  58
  59                 /* this also covers the 40Mhz SGI case (= MCS15) */
  60                 if (fw_rate == CONF_HW_RATE_INDEX_MCS7_SGI ||
  61                     fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
  62                         rate->flags |= IEEE80211_TX_RC_SHORT_GI;
  63
  64                 if (fw_rate > CONF_HW_RATE_INDEX_MCS7_SGI && vif) {
  65                         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
  66                         if (wlvif->channel_type == NL80211_CHAN_HT40MINUS ||
  67                             wlvif->channel_type == NL80211_CHAN_HT40PLUS) {
  68                                 /* adjustment needed for range 0-7 */
  69                                 rate->idx -= 8;
  70                                 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
  71                         }
  72                 }
  73         }
  74 }
  75
  76 static void wl18xx_tx_complete_packet(struct wl1271 *wl, u8 tx_stat_byte)
  77 {
  78         struct ieee80211_tx_info *info;
  79         struct sk_buff *skb;
  80         int id = tx_stat_byte & WL18XX_TX_STATUS_DESC_ID_MASK;
  81         bool tx_success;
  82
  83         /* check for id legality */
  84         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
  85                 wl1271_warning("illegal id in tx completion: %d", id);
  86                 return;
  87         }
  88
  89         /* a zero bit indicates Tx success */
  90         tx_success = !(tx_stat_byte & BIT(WL18XX_TX_STATUS_STAT_BIT_IDX));
  91
  92         skb = wl->tx_frames[id];
  93         info = IEEE80211_SKB_CB(skb);
  94
  95         if (wl12xx_is_dummy_packet(wl, skb)) {
  96                 wl1271_free_tx_id(wl, id);
  97                 return;
  98         }
  99
 100         /* update the TX status info */
 101         if (tx_success && !(info->flags & IEEE80211_TX_CTL_NO_ACK))
 102                 info->flags |= IEEE80211_TX_STAT_ACK;
 103         /*
 104          * first pass info->control.vif while it's valid, and then fill out
 105          * the info->status structures
 106          */
 107         wl18xx_get_last_tx_rate(wl, info->control.vif,
 108                                 info->band, &info->status.rates[0]);
 109
 110         info->status.rates[0].count = 1; /* no data about retries */
 111         info->status.ack_signal = -1;
 112
 113         if (!tx_success)
 114                 wl->stats.retry_count++;
 115
 116         /*
 117          * TODO: update sequence number for encryption? seems to be
 118          * unsupported for now. needed for recovery with encryption.
 119          */
 120
 121         /* remove private header from packet */
 122         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 123
 124         /* remove TKIP header space if present */
 125         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 126             info->control.hw_key &&
 127             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 128                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 129                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, hdrlen);
 130                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
 131         }
 132
 133         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p success %d",
 134                      id, skb, tx_success);
 135
 136         /* return the packet to the stack */
 137         skb_queue_tail(&wl->deferred_tx_queue, skb);
 138         queue_work(wl->freezable_wq, &wl->netstack_work);
 139         wl1271_free_tx_id(wl, id);
 140 }
 141
 142 void wl18xx_tx_immediate_complete(struct wl1271 *wl)
 143 {
 144         struct wl18xx_fw_status_priv *status_priv =
 145                 (struct wl18xx_fw_status_priv *)wl->fw_status->priv;
 146         struct wl18xx_priv *priv = wl->priv;
 147         u8 i;
 148
 149         /* nothing to do here */
 150         if (priv->last_fw_rls_idx == status_priv->fw_release_idx)
 151                 return;
 152
 153         /* freed Tx descriptors */
 154         wl1271_debug(DEBUG_TX, "last released desc = %d, current idx = %d",
 155                      priv->last_fw_rls_idx, status_priv->fw_release_idx);
 156
 157         if (status_priv->fw_release_idx >= WL18XX_FW_MAX_TX_STATUS_DESC) {
 158                 wl1271_error("invalid desc release index %d",
 159                              status_priv->fw_release_idx);
 160                 WARN_ON(1);
 161                 return;
 162         }
 163
 164         for (i = priv->last_fw_rls_idx;
 165              i != status_priv->fw_release_idx;
 166              i = (i + 1) % WL18XX_FW_MAX_TX_STATUS_DESC) {
 167                 wl18xx_tx_complete_packet(wl,
 168                         status_priv->released_tx_desc[i]);
 169
 170                 wl->tx_results_count++;
 171         }
 172
 173         priv->last_fw_rls_idx = status_priv->fw_release_idx;
 174 }