drivers/net/wireless/libertas/tx.c

   1 /**
   2   * This file contains the handling of TX in wlan driver.
   3   */
   4 #include <linux/netdevice.h>
   5
   6 #include "hostcmd.h"
   7 #include "radiotap.h"
   8 #include "sbi.h"
   9 #include "decl.h"
  10 #include "defs.h"
  11 #include "dev.h"
  12 #include "wext.h"
  13
  14 /**
  15  *  @brief This function converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
  16  *  units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
  17  *
  18  *  @param rate    Input rate
  19  *  @return      Output Rate (0 if invalid)
  20  */
  21 static u32 convert_radiotap_rate_to_mv(u8 rate)
  22 {
  23         switch (rate) {
  24         case 2:         /*   1 Mbps */
  25                 return 0 | (1 << 4);
  26         case 4:         /*   2 Mbps */
  27                 return 1 | (1 << 4);
  28         case 11:                /* 5.5 Mbps */
  29                 return 2 | (1 << 4);
  30         case 22:                /*  11 Mbps */
  31                 return 3 | (1 << 4);
  32         case 12:                /*   6 Mbps */
  33                 return 4 | (1 << 4);
  34         case 18:                /*   9 Mbps */
  35                 return 5 | (1 << 4);
  36         case 24:                /*  12 Mbps */
  37                 return 6 | (1 << 4);
  38         case 36:                /*  18 Mbps */
  39                 return 7 | (1 << 4);
  40         case 48:                /*  24 Mbps */
  41                 return 8 | (1 << 4);
  42         case 72:                /*  36 Mbps */
  43                 return 9 | (1 << 4);
  44         case 96:                /*  48 Mbps */
  45                 return 10 | (1 << 4);
  46         case 108:               /*  54 Mbps */
  47                 return 11 | (1 << 4);
  48         }
  49         return 0;
  50 }
  51
  52 /**
  53  *  @brief This function processes a single packet and sends
  54  *  to IF layer
  55  *
  56  *  @param priv    A pointer to wlan_private structure
  57  *  @param skb     A pointer to skb which includes TX packet
  58  *  @return        0 or -1
  59  */
  60 static int SendSinglePacket(wlan_private * priv, struct sk_buff *skb)
  61 {
  62         wlan_adapter *adapter = priv->adapter;
  63         int ret = 0;
  64         struct txpd localtxpd;
  65         struct txpd *plocaltxpd = &localtxpd;
  66         u8 *p802x_hdr;
  67         struct tx_radiotap_hdr *pradiotap_hdr;
  68         u32 new_rate;
  69         u8 *ptr = priv->adapter->tmptxbuf;
  70
  71         ENTER();
  72
  73         if (priv->adapter->surpriseremoved)
  74                 return -1;
  75
  76         if ((priv->adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0)
  77                 lbs_dbg_hex("TX packet: ", skb->data,
  78                          min_t(unsigned int, skb->len, 100));
  79
  80         if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
  81                 lbs_pr_debug(1, "Tx error: Bad skb length %d : %d\n",
  82                        skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
  83                 ret = -1;
  84                 goto done;
  85         }
  86
  87         memset(plocaltxpd, 0, sizeof(struct txpd));
  88
  89         plocaltxpd->tx_packet_length = skb->len;
  90
  91         /* offset of actual data */
  92         plocaltxpd->tx_packet_location = sizeof(struct txpd);
  93
  94         /* TxCtrl set by user or default */
  95         plocaltxpd->tx_control = adapter->pkttxctrl;
  96
  97         p802x_hdr = skb->data;
  98         if (priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {
  99
 100                 /* locate radiotap header */
 101                 pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data;
 102
 103                 /* set txpd fields from the radiotap header */
 104                 new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate);
 105                 if (new_rate != 0) {
 106                         /* erase tx_control[4:0] */
 107                         plocaltxpd->tx_control &= ~0x1f;
 108                         /* write new tx_control[4:0] */
 109                         plocaltxpd->tx_control |= new_rate;
 110                 }
 111
 112                 /* skip the radiotap header */
 113                 p802x_hdr += sizeof(struct tx_radiotap_hdr);
 114                 plocaltxpd->tx_packet_length -= sizeof(struct tx_radiotap_hdr);
 115
 116         }
 117         /* copy destination address from 802.3 or 802.11 header */
 118         if (priv->adapter->linkmode == WLAN_LINKMODE_802_11)
 119                 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
 120         else
 121                 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
 122
 123         lbs_dbg_hex("txpd", (u8 *) plocaltxpd, sizeof(struct txpd));
 124
 125         if (IS_MESH_FRAME(skb)) {
 126                 plocaltxpd->tx_control |= TxPD_MESH_FRAME;
 127         }
 128
 129         memcpy(ptr, plocaltxpd, sizeof(struct txpd));
 130
 131         ptr += sizeof(struct txpd);
 132
 133         lbs_dbg_hex("Tx Data", (u8 *) p802x_hdr, plocaltxpd->tx_packet_length);
 134         memcpy(ptr, p802x_hdr, plocaltxpd->tx_packet_length);
 135         ret = libertas_sbi_host_to_card(priv, MVMS_DAT,
 136                                priv->adapter->tmptxbuf,
 137                                plocaltxpd->tx_packet_length +
 138                                sizeof(struct txpd));
 139
 140         if (ret) {
 141                 lbs_pr_debug(1, "Tx error: libertas_sbi_host_to_card failed: 0x%X\n", ret);
 142                 goto done;
 143         }
 144
 145         lbs_pr_debug(1, "SendSinglePacket succeeds\n");
 146
 147       done:
 148         if (!ret) {
 149                 priv->stats.tx_packets++;
 150                 priv->stats.tx_bytes += skb->len;
 151         } else {
 152                 priv->stats.tx_dropped++;
 153                 priv->stats.tx_errors++;
 154         }
 155
 156         if (!ret && priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {
 157                 /* Keep the skb to echo it back once Tx feedback is
 158                    received from FW */
 159                 skb_orphan(skb);
 160                 /* stop processing outgoing pkts */
 161                 netif_stop_queue(priv->wlan_dev.netdev);
 162                 /* freeze any packets already in our queues */
 163                 priv->adapter->TxLockFlag = 1;
 164         } else {
 165                 dev_kfree_skb_any(skb);
 166                 priv->adapter->currenttxskb = NULL;
 167         }
 168
 169         LEAVE();
 170         return ret;
 171 }
 172
 173
 174 void libertas_tx_runqueue(wlan_private *priv)
 175 {
 176         wlan_adapter *adapter = priv->adapter;
 177         int i;
 178
 179         spin_lock(&adapter->txqueue_lock);
 180         for (i = 0; i < adapter->tx_queue_idx; i++) {
 181                 struct sk_buff *skb = adapter->tx_queue_ps[i];
 182                 spin_unlock(&adapter->txqueue_lock);
 183                 SendSinglePacket(priv, skb);
 184                 spin_lock(&adapter->txqueue_lock);
 185         }
 186         adapter->tx_queue_idx = 0;
 187         spin_unlock(&adapter->txqueue_lock);
 188 }
 189
 190 static void wlan_tx_queue(wlan_private *priv, struct sk_buff *skb)
 191 {
 192         wlan_adapter *adapter = priv->adapter;
 193
 194         spin_lock(&adapter->txqueue_lock);
 195
 196         WARN_ON(priv->adapter->tx_queue_idx >= NR_TX_QUEUE);
 197         adapter->tx_queue_ps[adapter->tx_queue_idx++] = skb;
 198         if (adapter->tx_queue_idx == NR_TX_QUEUE)
 199                 netif_stop_queue(priv->wlan_dev.netdev);
 200         else
 201                 netif_start_queue(priv->wlan_dev.netdev);
 202
 203         spin_unlock(&adapter->txqueue_lock);
 204 }
 205
 206 /**
 207  *  @brief This function checks the conditions and sends packet to IF
 208  *  layer if everything is ok.
 209  *
 210  *  @param priv    A pointer to wlan_private structure
 211  *  @return        n/a
 212  */
 213 int libertas_process_tx(wlan_private * priv, struct sk_buff *skb)
 214 {
 215         int ret = -1;
 216
 217         ENTER();
 218
 219         lbs_dbg_hex("TX Data", skb->data, min_t(unsigned int, skb->len, 100));
 220
 221         if (priv->wlan_dev.dnld_sent) {
 222                 lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n",
 223                        priv->wlan_dev.dnld_sent);
 224                 goto done;
 225         }
 226
 227         if ((priv->adapter->psstate == PS_STATE_SLEEP) ||
 228             (priv->adapter->psstate == PS_STATE_PRE_SLEEP)) {
 229                 wlan_tx_queue(priv, skb);
 230                 return ret;
 231         }
 232
 233         priv->adapter->currenttxskb = skb;
 234
 235         ret = SendSinglePacket(priv, skb);
 236 done:
 237         LEAVE();
 238         return ret;
 239 }
 240
 241 /**
 242  *  @brief This function sends to the host the last transmitted packet,
 243  *  filling the radiotap headers with transmission information.
 244  *
 245  *  @param priv     A pointer to wlan_private structure
 246  *  @param status   A 32 bit value containing transmission status.
 247  *
 248  *  @returns void
 249  */
 250 void libertas_send_tx_feedback(wlan_private * priv)
 251 {
 252         wlan_adapter *adapter = priv->adapter;
 253         struct tx_radiotap_hdr *radiotap_hdr;
 254         u32 status = adapter->eventcause;
 255         int txfail;
 256         int try_count;
 257
 258         if (adapter->radiomode != WLAN_RADIOMODE_RADIOTAP ||
 259             adapter->currenttxskb == NULL)
 260                 return;
 261
 262         radiotap_hdr = (struct tx_radiotap_hdr *)adapter->currenttxskb->data;
 263
 264         if ((adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0)
 265                 lbs_dbg_hex("TX feedback: ", (u8 *) radiotap_hdr,
 266                         min_t(unsigned int, adapter->currenttxskb->len, 100));
 267
 268         txfail = (status >> 24);
 269
 270 #if 0
 271         /* The version of roofnet that we've tested does not use this yet
 272          * But it may be used in the future.
 273          */
 274         if (txfail)
 275                 radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL;
 276 #endif
 277         try_count = (status >> 16) & 0xff;
 278         radiotap_hdr->data_retries = (try_count) ?
 279             (1 + adapter->txretrycount - try_count) : 0;
 280         libertas_upload_rx_packet(priv, adapter->currenttxskb);
 281         adapter->currenttxskb = NULL;
 282         priv->adapter->TxLockFlag = 0;
 283         if (priv->adapter->connect_status == libertas_connected)
 284                 netif_wake_queue(priv->wlan_dev.netdev);
 285 }