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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This file is part of wl18xx
   4  *
   5  * Copyright (C) 2011 Texas Instruments Inc.
   6  */
   7
   8 #include "../wlcore/wlcore.h"
   9 #include "../wlcore/cmd.h"
  10 #include "../wlcore/debug.h"
  11 #include "../wlcore/acx.h"
  12 #include "../wlcore/tx.h"
  13
  14 #include "wl18xx.h"
  15 #include "tx.h"
  16
  17 static
  18 void wl18xx_get_last_tx_rate(struct wl1271 *wl, struct ieee80211_vif *vif,
  19                              u8 band, struct ieee80211_tx_rate *rate, u8 hlid)
  20 {
  21         u8 fw_rate = wl->links[hlid].fw_rate_idx;
  22
  23         if (fw_rate > CONF_HW_RATE_INDEX_MAX) {
  24                 wl1271_error("last Tx rate invalid: %d", fw_rate);
  25                 rate->idx = 0;
  26                 rate->flags = 0;
  27                 return;
  28         }
  29
  30         if (fw_rate <= CONF_HW_RATE_INDEX_54MBPS) {
  31                 rate->idx = fw_rate;
  32                 if (band == NL80211_BAND_5GHZ)
  33                         rate->idx -= CONF_HW_RATE_INDEX_6MBPS;
  34                 rate->flags = 0;
  35         } else {
  36                 rate->flags = IEEE80211_TX_RC_MCS;
  37                 rate->idx = fw_rate - CONF_HW_RATE_INDEX_MCS0;
  38
  39                 /* SGI modifier is counted as a separate rate */
  40                 if (fw_rate >= CONF_HW_RATE_INDEX_MCS7_SGI)
  41                         (rate->idx)--;
  42                 if (fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
  43                         (rate->idx)--;
  44
  45                 /* this also covers the 40Mhz SGI case (= MCS15) */
  46                 if (fw_rate == CONF_HW_RATE_INDEX_MCS7_SGI ||
  47                     fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
  48                         rate->flags |= IEEE80211_TX_RC_SHORT_GI;
  49
  50                 if (fw_rate > CONF_HW_RATE_INDEX_MCS7_SGI && vif) {
  51                         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
  52                         if (wlvif->channel_type == NL80211_CHAN_HT40MINUS ||
  53                             wlvif->channel_type == NL80211_CHAN_HT40PLUS) {
  54                                 /* adjustment needed for range 0-7 */
  55                                 rate->idx -= 8;
  56                                 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
  57                         }
  58                 }
  59         }
  60 }
  61
  62 static void wl18xx_tx_complete_packet(struct wl1271 *wl, u8 tx_stat_byte)
  63 {
  64         struct ieee80211_tx_info *info;
  65         struct sk_buff *skb;
  66         int id = tx_stat_byte & WL18XX_TX_STATUS_DESC_ID_MASK;
  67         bool tx_success;
  68         struct wl1271_tx_hw_descr *tx_desc;
  69
  70         /* check for id legality */
  71         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
  72                 wl1271_warning("illegal id in tx completion: %d", id);
  73                 return;
  74         }
  75
  76         /* a zero bit indicates Tx success */
  77         tx_success = !(tx_stat_byte & BIT(WL18XX_TX_STATUS_STAT_BIT_IDX));
  78
  79         skb = wl->tx_frames[id];
  80         info = IEEE80211_SKB_CB(skb);
  81         tx_desc = (struct wl1271_tx_hw_descr *)skb->data;
  82
  83         if (wl12xx_is_dummy_packet(wl, skb)) {
  84                 wl1271_free_tx_id(wl, id);
  85                 return;
  86         }
  87
  88         /* update the TX status info */
  89         if (tx_success && !(info->flags & IEEE80211_TX_CTL_NO_ACK))
  90                 info->flags |= IEEE80211_TX_STAT_ACK;
  91         /*
  92          * first pass info->control.vif while it's valid, and then fill out
  93          * the info->status structures
  94          */
  95         wl18xx_get_last_tx_rate(wl, info->control.vif,
  96                                 info->band,
  97                                 &info->status.rates[0],
  98                                 tx_desc->hlid);
  99
 100         info->status.rates[0].count = 1; /* no data about retries */
 101         info->status.ack_signal = -1;
 102
 103         if (!tx_success)
 104                 wl->stats.retry_count++;
 105
 106         /*
 107          * TODO: update sequence number for encryption? seems to be
 108          * unsupported for now. needed for recovery with encryption.
 109          */
 110
 111         /* remove private header from packet */
 112         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 113
 114         /* remove TKIP header space if present */
 115         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 116             info->control.hw_key &&
 117             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 118                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 119                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, hdrlen);
 120                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
 121         }
 122
 123         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p success %d",
 124                      id, skb, tx_success);
 125
 126         /* return the packet to the stack */
 127         skb_queue_tail(&wl->deferred_tx_queue, skb);
 128         queue_work(wl->freezable_wq, &wl->netstack_work);
 129         wl1271_free_tx_id(wl, id);
 130 }
 131
 132 void wl18xx_tx_immediate_complete(struct wl1271 *wl)
 133 {
 134         struct wl18xx_fw_status_priv *status_priv =
 135                 (struct wl18xx_fw_status_priv *)wl->fw_status->priv;
 136         struct wl18xx_priv *priv = wl->priv;
 137         u8 i, hlid;
 138
 139         /* nothing to do here */
 140         if (priv->last_fw_rls_idx == status_priv->fw_release_idx)
 141                 return;
 142
 143         /* update rates per link */
 144         hlid = wl->fw_status->counters.hlid;
 145
 146         if (hlid < WLCORE_MAX_LINKS) {
 147                 wl->links[hlid].fw_rate_idx =
 148                                 wl->fw_status->counters.tx_last_rate;
 149                 wl->links[hlid].fw_rate_mbps =
 150                                 wl->fw_status->counters.tx_last_rate_mbps;
 151         }
 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 }