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 "decl.h"
   9 #include "defs.h"
  10 #include "dev.h"
  11 #include "wext.h"
  12
  13 /**
  14  *  @brief This function converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
  15  *  units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
  16  *
  17  *  @param rate    Input rate
  18  *  @return      Output Rate (0 if invalid)
  19  */
  20 static u32 convert_radiotap_rate_to_mv(u8 rate)
  21 {
  22         switch (rate) {
  23         case 2:         /*   1 Mbps */
  24                 return 0 | (1 << 4);
  25         case 4:         /*   2 Mbps */
  26                 return 1 | (1 << 4);
  27         case 11:                /* 5.5 Mbps */
  28                 return 2 | (1 << 4);
  29         case 22:                /*  11 Mbps */
  30                 return 3 | (1 << 4);
  31         case 12:                /*   6 Mbps */
  32                 return 4 | (1 << 4);
  33         case 18:                /*   9 Mbps */
  34                 return 5 | (1 << 4);
  35         case 24:                /*  12 Mbps */
  36                 return 6 | (1 << 4);
  37         case 36:                /*  18 Mbps */
  38                 return 7 | (1 << 4);
  39         case 48:                /*  24 Mbps */
  40                 return 8 | (1 << 4);
  41         case 72:                /*  36 Mbps */
  42                 return 9 | (1 << 4);
  43         case 96:                /*  48 Mbps */
  44                 return 10 | (1 << 4);
  45         case 108:               /*  54 Mbps */
  46                 return 11 | (1 << 4);
  47         }
  48         return 0;
  49 }
  50
  51 /**
  52  *  @brief This function processes a single packet and sends
  53  *  to IF layer
  54  *
  55  *  @param priv    A pointer to wlan_private structure
  56  *  @param skb     A pointer to skb which includes TX packet
  57  *  @return        0 or -1
  58  */
  59 static int SendSinglePacket(wlan_private * priv, struct sk_buff *skb)
  60 {
  61         wlan_adapter *adapter = priv->adapter;
  62         int ret = 0;
  63         struct txpd localtxpd;
  64         struct txpd *plocaltxpd = &localtxpd;
  65         u8 *p802x_hdr;
  66         struct tx_radiotap_hdr *pradiotap_hdr;
  67         u32 new_rate;
  68         u8 *ptr = priv->adapter->tmptxbuf;
  69
  70         lbs_deb_enter(LBS_DEB_TX);
  71
  72         if (priv->adapter->surpriseremoved)
  73                 return -1;
  74
  75         if ((priv->adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0)
  76                 lbs_dbg_hex("TX packet: ", skb->data,
  77                          min_t(unsigned int, skb->len, 100));
  78
  79         if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
  80                 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
  81                        skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
  82                 ret = -1;
  83                 goto done;
  84         }
  85
  86         memset(plocaltxpd, 0, sizeof(struct txpd));
  87
  88         plocaltxpd->tx_packet_length = cpu_to_le16(skb->len);
  89
  90         /* offset of actual data */
  91         plocaltxpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
  92
  93         /* TxCtrl set by user or default */
  94         plocaltxpd->tx_control = cpu_to_le32(adapter->pkttxctrl);
  95
  96         p802x_hdr = skb->data;
  97         if (priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {
  98
  99                 /* locate radiotap header */
 100                 pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data;
 101
 102                 /* set txpd fields from the radiotap header */
 103                 new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate);
 104                 if (new_rate != 0) {
 105                         /* use new tx_control[4:0] */
 106                         new_rate |= (adapter->pkttxctrl & ~0x1f);
 107                         plocaltxpd->tx_control = cpu_to_le32(new_rate);
 108                 }
 109
 110                 /* skip the radiotap header */
 111                 p802x_hdr += sizeof(struct tx_radiotap_hdr);
 112                 plocaltxpd->tx_packet_length =
 113                         cpu_to_le16(le16_to_cpu(plocaltxpd->tx_packet_length)
 114                                     - 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 |= cpu_to_le32(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, le16_to_cpu(plocaltxpd->tx_packet_length));
 134         memcpy(ptr, p802x_hdr, le16_to_cpu(plocaltxpd->tx_packet_length));
 135         ret = priv->hw_host_to_card(priv, MVMS_DAT,
 136                                     priv->adapter->tmptxbuf,
 137                                     le16_to_cpu(plocaltxpd->tx_packet_length) +
 138                                     sizeof(struct txpd));
 139
 140         if (ret) {
 141                 lbs_deb_tx("tx err: hw_host_to_card returned 0x%X\n", ret);
 142                 goto done;
 143         }
 144
 145         lbs_deb_tx("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->dev);
 162                 netif_stop_queue(priv->mesh_dev);
 163                 /* freeze any packets already in our queues */
 164                 priv->adapter->TxLockFlag = 1;
 165         } else {
 166                 dev_kfree_skb_any(skb);
 167                 priv->adapter->currenttxskb = NULL;
 168         }
 169
 170         lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
 171         return ret;
 172 }
 173
 174
 175 void libertas_tx_runqueue(wlan_private *priv)
 176 {
 177         wlan_adapter *adapter = priv->adapter;
 178         int i;
 179
 180         spin_lock(&adapter->txqueue_lock);
 181         for (i = 0; i < adapter->tx_queue_idx; i++) {
 182                 struct sk_buff *skb = adapter->tx_queue_ps[i];
 183                 spin_unlock(&adapter->txqueue_lock);
 184                 SendSinglePacket(priv, skb);
 185                 spin_lock(&adapter->txqueue_lock);
 186         }
 187         adapter->tx_queue_idx = 0;
 188         spin_unlock(&adapter->txqueue_lock);
 189 }
 190
 191 static void wlan_tx_queue(wlan_private *priv, struct sk_buff *skb)
 192 {
 193         wlan_adapter *adapter = priv->adapter;
 194
 195         spin_lock(&adapter->txqueue_lock);
 196
 197         WARN_ON(priv->adapter->tx_queue_idx >= NR_TX_QUEUE);
 198         adapter->tx_queue_ps[adapter->tx_queue_idx++] = skb;
 199         if (adapter->tx_queue_idx == NR_TX_QUEUE) {
 200                 netif_stop_queue(priv->dev);
 201                 netif_stop_queue(priv->mesh_dev);
 202         } else {
 203                 netif_start_queue(priv->dev);
 204                 netif_start_queue(priv->mesh_dev);
 205         }
 206
 207         spin_unlock(&adapter->txqueue_lock);
 208 }
 209
 210 /**
 211  *  @brief This function checks the conditions and sends packet to IF
 212  *  layer if everything is ok.
 213  *
 214  *  @param priv    A pointer to wlan_private structure
 215  *  @return        n/a
 216  */
 217 int libertas_process_tx(wlan_private * priv, struct sk_buff *skb)
 218 {
 219         int ret = -1;
 220
 221         lbs_deb_enter(LBS_DEB_TX);
 222         lbs_dbg_hex("TX Data", skb->data, min_t(unsigned int, skb->len, 100));
 223
 224         if (priv->dnld_sent) {
 225                 lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n",
 226                        priv->dnld_sent);
 227                 goto done;
 228         }
 229
 230         if ((priv->adapter->psstate == PS_STATE_SLEEP) ||
 231             (priv->adapter->psstate == PS_STATE_PRE_SLEEP)) {
 232                 wlan_tx_queue(priv, skb);
 233                 return ret;
 234         }
 235
 236         priv->adapter->currenttxskb = skb;
 237
 238         ret = SendSinglePacket(priv, skb);
 239 done:
 240         lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
 241         return ret;
 242 }
 243
 244 /**
 245  *  @brief This function sends to the host the last transmitted packet,
 246  *  filling the radiotap headers with transmission information.
 247  *
 248  *  @param priv     A pointer to wlan_private structure
 249  *  @param status   A 32 bit value containing transmission status.
 250  *
 251  *  @returns void
 252  */
 253 void libertas_send_tx_feedback(wlan_private * priv)
 254 {
 255         wlan_adapter *adapter = priv->adapter;
 256         struct tx_radiotap_hdr *radiotap_hdr;
 257         u32 status = adapter->eventcause;
 258         int txfail;
 259         int try_count;
 260
 261         if (adapter->radiomode != WLAN_RADIOMODE_RADIOTAP ||
 262             adapter->currenttxskb == NULL)
 263                 return;
 264
 265         radiotap_hdr = (struct tx_radiotap_hdr *)adapter->currenttxskb->data;
 266
 267         if ((adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0)
 268                 lbs_dbg_hex("TX feedback: ", (u8 *) radiotap_hdr,
 269                         min_t(unsigned int, adapter->currenttxskb->len, 100));
 270
 271         txfail = (status >> 24);
 272
 273 #if 0
 274         /* The version of roofnet that we've tested does not use this yet
 275          * But it may be used in the future.
 276          */
 277         if (txfail)
 278                 radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL;
 279 #endif
 280         try_count = (status >> 16) & 0xff;
 281         radiotap_hdr->data_retries = (try_count) ?
 282             (1 + adapter->txretrycount - try_count) : 0;
 283         libertas_upload_rx_packet(priv, adapter->currenttxskb);
 284         adapter->currenttxskb = NULL;
 285         priv->adapter->TxLockFlag = 0;
 286         if (priv->adapter->connect_status == libertas_connected) {
 287                 netif_wake_queue(priv->dev);
 288                 netif_wake_queue(priv->mesh_dev);
 289         }
 290 }
 291 EXPORT_SYMBOL_GPL(libertas_send_tx_feedback);