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         int ret = 0;
  62         struct txpd localtxpd;
  63         struct txpd *plocaltxpd = &localtxpd;
  64         u8 *p802x_hdr;
  65         struct tx_radiotap_hdr *pradiotap_hdr;
  66         u32 new_rate;
  67         u8 *ptr = priv->adapter->tmptxbuf;
  68
  69         lbs_deb_enter(LBS_DEB_TX);
  70
  71         if (priv->adapter->surpriseremoved)
  72                 return -1;
  73
  74         if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
  75                 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
  76                        skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
  77                 ret = -1;
  78                 goto done;
  79         }
  80
  81         memset(plocaltxpd, 0, sizeof(struct txpd));
  82
  83         plocaltxpd->tx_packet_length = cpu_to_le16(skb->len);
  84
  85         /* offset of actual data */
  86         plocaltxpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
  87
  88         p802x_hdr = skb->data;
  89         if (priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {
  90
  91                 /* locate radiotap header */
  92                 pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data;
  93
  94                 /* set txpd fields from the radiotap header */
  95                 new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate);
  96                 if (new_rate != 0) {
  97                         /* use new tx_control[4:0] */
  98                         plocaltxpd->tx_control = cpu_to_le32(new_rate);
  99                 }
 100
 101                 /* skip the radiotap header */
 102                 p802x_hdr += sizeof(struct tx_radiotap_hdr);
 103                 plocaltxpd->tx_packet_length =
 104                         cpu_to_le16(le16_to_cpu(plocaltxpd->tx_packet_length)
 105                                     - sizeof(struct tx_radiotap_hdr));
 106
 107         }
 108         /* copy destination address from 802.3 or 802.11 header */
 109         if (priv->adapter->linkmode == WLAN_LINKMODE_802_11)
 110                 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
 111         else
 112                 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
 113
 114         lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) plocaltxpd, sizeof(struct txpd));
 115
 116         if (IS_MESH_FRAME(skb)) {
 117                 plocaltxpd->tx_control |= cpu_to_le32(TxPD_MESH_FRAME);
 118         }
 119
 120         memcpy(ptr, plocaltxpd, sizeof(struct txpd));
 121
 122         ptr += sizeof(struct txpd);
 123
 124         lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(plocaltxpd->tx_packet_length));
 125         memcpy(ptr, p802x_hdr, le16_to_cpu(plocaltxpd->tx_packet_length));
 126         ret = priv->hw_host_to_card(priv, MVMS_DAT,
 127                                     priv->adapter->tmptxbuf,
 128                                     le16_to_cpu(plocaltxpd->tx_packet_length) +
 129                                     sizeof(struct txpd));
 130
 131         if (ret) {
 132                 lbs_deb_tx("tx err: hw_host_to_card returned 0x%X\n", ret);
 133                 goto done;
 134         }
 135
 136         lbs_deb_tx("SendSinglePacket succeeds\n");
 137
 138 done:
 139         if (!ret) {
 140                 priv->stats.tx_packets++;
 141                 priv->stats.tx_bytes += skb->len;
 142         } else {
 143                 priv->stats.tx_dropped++;
 144                 priv->stats.tx_errors++;
 145         }
 146
 147         if (!ret && priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {
 148                 /* Keep the skb to echo it back once Tx feedback is
 149                    received from FW */
 150                 skb_orphan(skb);
 151                 /* stop processing outgoing pkts */
 152                 netif_stop_queue(priv->dev);
 153                 if (priv->mesh_dev)
 154                         netif_stop_queue(priv->mesh_dev);
 155                 /* freeze any packets already in our queues */
 156                 priv->adapter->TxLockFlag = 1;
 157         } else {
 158                 dev_kfree_skb_any(skb);
 159                 priv->adapter->currenttxskb = NULL;
 160         }
 161
 162         lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
 163         return ret;
 164 }
 165
 166
 167 void libertas_tx_runqueue(wlan_private *priv)
 168 {
 169         wlan_adapter *adapter = priv->adapter;
 170         int i;
 171
 172         spin_lock(&adapter->txqueue_lock);
 173         for (i = 0; i < adapter->tx_queue_idx; i++) {
 174                 struct sk_buff *skb = adapter->tx_queue_ps[i];
 175                 spin_unlock(&adapter->txqueue_lock);
 176                 SendSinglePacket(priv, skb);
 177                 spin_lock(&adapter->txqueue_lock);
 178         }
 179         adapter->tx_queue_idx = 0;
 180         spin_unlock(&adapter->txqueue_lock);
 181 }
 182
 183 static void wlan_tx_queue(wlan_private *priv, struct sk_buff *skb)
 184 {
 185         wlan_adapter *adapter = priv->adapter;
 186
 187         spin_lock(&adapter->txqueue_lock);
 188
 189         WARN_ON(priv->adapter->tx_queue_idx >= NR_TX_QUEUE);
 190         adapter->tx_queue_ps[adapter->tx_queue_idx++] = skb;
 191         if (adapter->tx_queue_idx == NR_TX_QUEUE) {
 192                 netif_stop_queue(priv->dev);
 193                 if (priv->mesh_dev)
 194                         netif_stop_queue(priv->mesh_dev);
 195         } else {
 196                 netif_start_queue(priv->dev);
 197                 if (priv->mesh_dev)
 198                         netif_start_queue(priv->mesh_dev);
 199         }
 200
 201         spin_unlock(&adapter->txqueue_lock);
 202 }
 203
 204 /**
 205  *  @brief This function checks the conditions and sends packet to IF
 206  *  layer if everything is ok.
 207  *
 208  *  @param priv    A pointer to wlan_private structure
 209  *  @return        n/a
 210  */
 211 int libertas_process_tx(wlan_private * priv, struct sk_buff *skb)
 212 {
 213         int ret = -1;
 214
 215         lbs_deb_enter(LBS_DEB_TX);
 216         lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
 217
 218         if (priv->dnld_sent) {
 219                 lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n",
 220                        priv->dnld_sent);
 221                 goto done;
 222         }
 223
 224         if ((priv->adapter->psstate == PS_STATE_SLEEP) ||
 225             (priv->adapter->psstate == PS_STATE_PRE_SLEEP)) {
 226                 wlan_tx_queue(priv, skb);
 227                 return ret;
 228         }
 229
 230         priv->adapter->currenttxskb = skb;
 231
 232         ret = SendSinglePacket(priv, skb);
 233 done:
 234         lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
 235         return ret;
 236 }
 237
 238 /**
 239  *  @brief This function sends to the host the last transmitted packet,
 240  *  filling the radiotap headers with transmission information.
 241  *
 242  *  @param priv     A pointer to wlan_private structure
 243  *  @param status   A 32 bit value containing transmission status.
 244  *
 245  *  @returns void
 246  */
 247 void libertas_send_tx_feedback(wlan_private * priv)
 248 {
 249         wlan_adapter *adapter = priv->adapter;
 250         struct tx_radiotap_hdr *radiotap_hdr;
 251         u32 status = adapter->eventcause;
 252         int txfail;
 253         int try_count;
 254
 255         if (adapter->radiomode != WLAN_RADIOMODE_RADIOTAP ||
 256             adapter->currenttxskb == NULL)
 257                 return;
 258
 259         radiotap_hdr = (struct tx_radiotap_hdr *)adapter->currenttxskb->data;
 260
 261         txfail = (status >> 24);
 262
 263 #if 0
 264         /* The version of roofnet that we've tested does not use this yet
 265          * But it may be used in the future.
 266          */
 267         if (txfail)
 268                 radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL;
 269 #endif
 270         try_count = (status >> 16) & 0xff;
 271         radiotap_hdr->data_retries = (try_count) ?
 272             (1 + adapter->txretrycount - try_count) : 0;
 273         libertas_upload_rx_packet(priv, adapter->currenttxskb);
 274         adapter->currenttxskb = NULL;
 275         priv->adapter->TxLockFlag = 0;
 276         if (priv->adapter->connect_status == LIBERTAS_CONNECTED) {
 277                 netif_wake_queue(priv->dev);
 278                 if (priv->mesh_dev)
 279                         netif_wake_queue(priv->mesh_dev);
 280         }
 281 }
 282 EXPORT_SYMBOL_GPL(libertas_send_tx_feedback);