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 void wl18xx_tx_complete_packet(struct wl1271 *wl, u8 tx_stat_byte)
  32 {
  33         struct ieee80211_tx_info *info;
  34         struct sk_buff *skb;
  35         int id = tx_stat_byte & WL18XX_TX_STATUS_DESC_ID_MASK;
  36         bool tx_success;
  37
  38         /* check for id legality */
  39         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
  40                 wl1271_warning("illegal id in tx completion: %d", id);
  41                 return;
  42         }
  43
  44         /* a zero bit indicates Tx success */
  45         tx_success = !(tx_stat_byte & BIT(WL18XX_TX_STATUS_STAT_BIT_IDX));
  46
  47
  48         skb = wl->tx_frames[id];
  49         info = IEEE80211_SKB_CB(skb);
  50
  51         if (wl12xx_is_dummy_packet(wl, skb)) {
  52                 wl1271_free_tx_id(wl, id);
  53                 return;
  54         }
  55
  56         /* update the TX status info */
  57         if (tx_success && !(info->flags & IEEE80211_TX_CTL_NO_ACK))
  58                 info->flags |= IEEE80211_TX_STAT_ACK;
  59
  60         /* no real data about Tx completion */
  61         info->status.rates[0].idx = -1;
  62         info->status.rates[0].count = 0;
  63         info->status.rates[0].flags = 0;
  64         info->status.ack_signal = -1;
  65
  66         if (!tx_success)
  67                 wl->stats.retry_count++;
  68
  69         /*
  70          * TODO: update sequence number for encryption? seems to be
  71          * unsupported for now. needed for recovery with encryption.
  72          */
  73
  74         /* remove private header from packet */
  75         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
  76
  77         /* remove TKIP header space if present */
  78         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
  79             info->control.hw_key &&
  80             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
  81                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
  82                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, hdrlen);
  83                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
  84         }
  85
  86         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p success %d",
  87                      id, skb, tx_success);
  88
  89         /* return the packet to the stack */
  90         skb_queue_tail(&wl->deferred_tx_queue, skb);
  91         queue_work(wl->freezable_wq, &wl->netstack_work);
  92         wl1271_free_tx_id(wl, id);
  93 }
  94
  95 void wl18xx_tx_immediate_complete(struct wl1271 *wl)
  96 {
  97         struct wl18xx_fw_status_priv *status_priv =
  98                 (struct wl18xx_fw_status_priv *)wl->fw_status_2->priv;
  99         struct wl18xx_priv *priv = wl->priv;
 100         u8 i;
 101
 102         /* nothing to do here */
 103         if (priv->last_fw_rls_idx == status_priv->fw_release_idx)
 104                 return;
 105
 106         /* freed Tx descriptors */
 107         wl1271_debug(DEBUG_TX, "last released desc = %d, current idx = %d",
 108                      priv->last_fw_rls_idx, status_priv->fw_release_idx);
 109
 110         if (status_priv->fw_release_idx >= WL18XX_FW_MAX_TX_STATUS_DESC) {
 111                 wl1271_error("invalid desc release index %d",
 112                              status_priv->fw_release_idx);
 113                 WARN_ON(1);
 114                 return;
 115         }
 116
 117         for (i = priv->last_fw_rls_idx;
 118              i != status_priv->fw_release_idx;
 119              i = (i + 1) % WL18XX_FW_MAX_TX_STATUS_DESC) {
 120                 wl18xx_tx_complete_packet(wl,
 121                         status_priv->released_tx_desc[i]);
 122
 123                 wl->tx_results_count++;
 124         }
 125
 126         priv->last_fw_rls_idx = status_priv->fw_release_idx;
 127 }