LXR linux/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#include <linux/etherdevice.h>
   6#include <linux/sched.h>
   7
   8#include "hostcmd.h"
   9#include "radiotap.h"
  10#include "decl.h"
  11#include "defs.h"
  12#include "dev.h"
  13#include "wext.h"
  14
  15/**
  16 *  @brief This function converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
  17 *  units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
  18 *
  19 *  @param rate    Input rate
  20 *  @return      Output Rate (0 if invalid)
  21 */
  22static u32 convert_radiotap_rate_to_mv(u8 rate)
  23{
  24        switch (rate) {
  25        case 2:         /*   1 Mbps */
  26                return 0 | (1 << 4);
  27        case 4:         /*   2 Mbps */
  28                return 1 | (1 << 4);
  29        case 11:                /* 5.5 Mbps */
  30                return 2 | (1 << 4);
  31        case 22:                /*  11 Mbps */
  32                return 3 | (1 << 4);
  33        case 12:                /*   6 Mbps */
  34                return 4 | (1 << 4);
  35        case 18:                /*   9 Mbps */
  36                return 5 | (1 << 4);
  37        case 24:                /*  12 Mbps */
  38                return 6 | (1 << 4);
  39        case 36:                /*  18 Mbps */
  40                return 7 | (1 << 4);
  41        case 48:                /*  24 Mbps */
  42                return 8 | (1 << 4);
  43        case 72:                /*  36 Mbps */
  44                return 9 | (1 << 4);
  45        case 96:                /*  48 Mbps */
  46                return 10 | (1 << 4);
  47        case 108:               /*  54 Mbps */
  48                return 11 | (1 << 4);
  49        }
  50        return 0;
  51}
  52
  53/**
  54 *  @brief This function checks the conditions and sends packet to IF
  55 *  layer if everything is ok.
  56 *
  57 *  @param priv    A pointer to struct lbs_private structure
  58 *  @param skb     A pointer to skb which includes TX packet
  59 *  @return        0 or -1
  60 */
  61netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
  62{
  63        unsigned long flags;
  64        struct lbs_private *priv = dev->ml_priv;
  65        struct txpd *txpd;
  66        char *p802x_hdr;
  67        uint16_t pkt_len;
  68        netdev_tx_t ret = NETDEV_TX_OK;
  69
  70        lbs_deb_enter(LBS_DEB_TX);
  71
  72        /* We need to protect against the queues being restarted before
  73           we get round to stopping them */
  74        spin_lock_irqsave(&priv->driver_lock, flags);
  75
  76        if (priv->surpriseremoved)
  77                goto free;
  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                /* We'll never manage to send this one; drop it and return 'OK' */
  83
  84                dev->stats.tx_dropped++;
  85                dev->stats.tx_errors++;
  86                goto free;
  87        }
  88
  89
  90        netif_stop_queue(priv->dev);
  91        if (priv->mesh_dev)
  92                netif_stop_queue(priv->mesh_dev);
  93
  94        if (priv->tx_pending_len) {
  95                /* This can happen if packets come in on the mesh and eth
  96                   device simultaneously -- there's no mutual exclusion on
  97                   hard_start_xmit() calls between devices. */
  98                lbs_deb_tx("Packet on %s while busy\n", dev->name);
  99                ret = NETDEV_TX_BUSY;
 100                goto unlock;
 101        }
 102
 103        priv->tx_pending_len = -1;
 104        spin_unlock_irqrestore(&priv->driver_lock, flags);
 105
 106        lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
 107
 108        txpd = (void *)priv->tx_pending_buf;
 109        memset(txpd, 0, sizeof(struct txpd));
 110
 111        p802x_hdr = skb->data;
 112        pkt_len = skb->len;
 113
 114        if (dev == priv->rtap_net_dev) {
 115                struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;
 116
 117                /* set txpd fields from the radiotap header */
 118                txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));
 119
 120                /* skip the radiotap header */
 121                p802x_hdr += sizeof(*rtap_hdr);
 122                pkt_len -= sizeof(*rtap_hdr);
 123
 124                /* copy destination address from 802.11 header */
 125                memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
 126        } else {
 127                /* copy destination address from 802.3 header */
 128                memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
 129        }
 130
 131        txpd->tx_packet_length = cpu_to_le16(pkt_len);
 132        txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
 133
 134        if (dev == priv->mesh_dev) {
 135                if (priv->mesh_fw_ver == MESH_FW_OLD)
 136                        txpd->tx_control |= cpu_to_le32(TxPD_MESH_FRAME);
 137                else if (priv->mesh_fw_ver == MESH_FW_NEW)
 138                        txpd->u.bss.bss_num = MESH_IFACE_ID;
 139        }
 140
 141        lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd));
 142
 143        lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
 144
 145        memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
 146
 147        spin_lock_irqsave(&priv->driver_lock, flags);
 148        priv->tx_pending_len = pkt_len + sizeof(struct txpd);
 149
 150        lbs_deb_tx("%s lined up packet\n", __func__);
 151
 152        dev->stats.tx_packets++;
 153        dev->stats.tx_bytes += skb->len;
 154
 155        dev->trans_start = jiffies;
 156
 157        if (priv->monitormode) {
 158                /* Keep the skb to echo it back once Tx feedback is
 159                   received from FW */
 160                skb_orphan(skb);
 161
 162                /* Keep the skb around for when we get feedback */
 163                priv->currenttxskb = skb;
 164        } else {
 165 free:
 166                dev_kfree_skb_any(skb);
 167        }
 168 unlock:
 169        spin_unlock_irqrestore(&priv->driver_lock, flags);
 170        wake_up(&priv->waitq);
 171
 172        lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
 173        return ret;
 174}
 175
 176/**
 177 *  @brief This function sends to the host the last transmitted packet,
 178 *  filling the radiotap headers with transmission information.
 179 *
 180 *  @param priv     A pointer to struct lbs_private structure
 181 *  @param status   A 32 bit value containing transmission status.
 182 *
 183 *  @returns void
 184 */
 185void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count)
 186{
 187        struct tx_radiotap_hdr *radiotap_hdr;
 188
 189        if (!priv->monitormode || priv->currenttxskb == NULL)
 190                return;
 191
 192        radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
 193
 194        radiotap_hdr->data_retries = try_count ?
 195                (1 + priv->txretrycount - try_count) : 0;
 196
 197        priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb,
 198                                                      priv->rtap_net_dev);
 199        netif_rx(priv->currenttxskb);
 200
 201        priv->currenttxskb = NULL;
 202
 203        if (priv->connect_status == LBS_CONNECTED)
 204                netif_wake_queue(priv->dev);
 205
 206        if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED))
 207                netif_wake_queue(priv->mesh_dev);
 208}
 209EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);
 210