root/drivers/net/wireless/marvell/libertas/tx.c

DEFINITIONS

1. convert_radiotap_rate_to_mv
2. lbs_hard_start_xmit
3. lbs_send_tx_feedback

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This file contains the handling of TX in wlan driver.
   4  */
   5 #include <linux/hardirq.h>
   6 #include <linux/netdevice.h>
   7 #include <linux/etherdevice.h>
   8 #include <linux/sched.h>
   9 #include <linux/export.h>
  10 #include <net/cfg80211.h>
  11 
  12 #include "host.h"
  13 #include "radiotap.h"
  14 #include "decl.h"
  15 #include "defs.h"
  16 #include "dev.h"
  17 #include "mesh.h"
  18 
  19 /**
  20  * convert_radiotap_rate_to_mv - converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
  21  * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
  22  *
  23  * @rate:       Input rate
  24  * returns:     Output Rate (0 if invalid)
  25  */
  26 static u32 convert_radiotap_rate_to_mv(u8 rate)
  27 {
  28         switch (rate) {
  29         case 2:         /*   1 Mbps */
  30                 return 0 | (1 << 4);
  31         case 4:         /*   2 Mbps */
  32                 return 1 | (1 << 4);
  33         case 11:                /* 5.5 Mbps */
  34                 return 2 | (1 << 4);
  35         case 22:                /*  11 Mbps */
  36                 return 3 | (1 << 4);
  37         case 12:                /*   6 Mbps */
  38                 return 4 | (1 << 4);
  39         case 18:                /*   9 Mbps */
  40                 return 5 | (1 << 4);
  41         case 24:                /*  12 Mbps */
  42                 return 6 | (1 << 4);
  43         case 36:                /*  18 Mbps */
  44                 return 7 | (1 << 4);
  45         case 48:                /*  24 Mbps */
  46                 return 8 | (1 << 4);
  47         case 72:                /*  36 Mbps */
  48                 return 9 | (1 << 4);
  49         case 96:                /*  48 Mbps */
  50                 return 10 | (1 << 4);
  51         case 108:               /*  54 Mbps */
  52                 return 11 | (1 << 4);
  53         }
  54         return 0;
  55 }
  56 
  57 /**
  58  * lbs_hard_start_xmit - checks the conditions and sends packet to IF
  59  * layer if everything is ok
  60  *
  61  * @skb:        A pointer to skb which includes TX packet
  62  * @dev:        A pointer to the &struct net_device
  63  * returns:     0 or -1
  64  */
  65 netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
  66 {
  67         unsigned long flags;
  68         struct lbs_private *priv = dev->ml_priv;
  69         struct txpd *txpd;
  70         char *p802x_hdr;
  71         uint16_t pkt_len;
  72         netdev_tx_t ret = NETDEV_TX_OK;
  73 
  74         /* We need to protect against the queues being restarted before
  75            we get round to stopping them */
  76         spin_lock_irqsave(&priv->driver_lock, flags);
  77 
  78         if (priv->surpriseremoved)
  79                 goto free;
  80 
  81         if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
  82                 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
  83                        skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
  84                 /* We'll never manage to send this one; drop it and return 'OK' */
  85 
  86                 dev->stats.tx_dropped++;
  87                 dev->stats.tx_errors++;
  88                 goto free;
  89         }
  90 
  91 
  92         netif_stop_queue(priv->dev);
  93         if (priv->mesh_dev)
  94                 netif_stop_queue(priv->mesh_dev);
  95 
  96         if (priv->tx_pending_len) {
  97                 /* This can happen if packets come in on the mesh and eth
  98                    device simultaneously -- there's no mutual exclusion on
  99                    hard_start_xmit() calls between devices. */
 100                 lbs_deb_tx("Packet on %s while busy\n", dev->name);
 101                 ret = NETDEV_TX_BUSY;
 102                 goto unlock;
 103         }
 104 
 105         priv->tx_pending_len = -1;
 106         spin_unlock_irqrestore(&priv->driver_lock, flags);
 107 
 108         lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
 109 
 110         txpd = (void *)priv->tx_pending_buf;
 111         memset(txpd, 0, sizeof(struct txpd));
 112 
 113         p802x_hdr = skb->data;
 114         pkt_len = skb->len;
 115 
 116         if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
 117                 struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;
 118 
 119                 /* set txpd fields from the radiotap header */
 120                 txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));
 121 
 122                 /* skip the radiotap header */
 123                 p802x_hdr += sizeof(*rtap_hdr);
 124                 pkt_len -= sizeof(*rtap_hdr);
 125 
 126                 /* copy destination address from 802.11 header */
 127                 memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
 128         } else {
 129                 /* copy destination address from 802.3 header */
 130                 memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
 131         }
 132 
 133         txpd->tx_packet_length = cpu_to_le16(pkt_len);
 134         txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
 135 
 136         lbs_mesh_set_txpd(priv, dev, txpd);
 137 
 138         lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd));
 139 
 140         lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
 141 
 142         memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
 143 
 144         spin_lock_irqsave(&priv->driver_lock, flags);
 145         priv->tx_pending_len = pkt_len + sizeof(struct txpd);
 146 
 147         lbs_deb_tx("%s lined up packet\n", __func__);
 148 
 149         dev->stats.tx_packets++;
 150         dev->stats.tx_bytes += skb->len;
 151 
 152         if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
 153                 /* Keep the skb to echo it back once Tx feedback is
 154                    received from FW */
 155                 skb_orphan(skb);
 156 
 157                 /* Keep the skb around for when we get feedback */
 158                 priv->currenttxskb = skb;
 159         } else {
 160  free:
 161                 dev_kfree_skb_any(skb);
 162         }
 163 
 164  unlock:
 165         spin_unlock_irqrestore(&priv->driver_lock, flags);
 166         wake_up(&priv->waitq);
 167 
 168         return ret;
 169 }
 170 
 171 /**
 172  * lbs_send_tx_feedback - sends to the host the last transmitted packet,
 173  * filling the radiotap headers with transmission information.
 174  *
 175  * @priv:       A pointer to &struct lbs_private structure
 176  * @try_count:  A 32-bit value containing transmission retry status.
 177  *
 178  * returns:     void
 179  */
 180 void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count)
 181 {
 182         struct tx_radiotap_hdr *radiotap_hdr;
 183 
 184         if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR ||
 185             priv->currenttxskb == NULL)
 186                 return;
 187 
 188         radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
 189 
 190         radiotap_hdr->data_retries = try_count ?
 191                 (1 + priv->txretrycount - try_count) : 0;
 192 
 193         priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb,
 194                                                       priv->dev);
 195         netif_rx(priv->currenttxskb);
 196 
 197         priv->currenttxskb = NULL;
 198 
 199         if (priv->connect_status == LBS_CONNECTED)
 200                 netif_wake_queue(priv->dev);
 201 
 202         if (priv->mesh_dev && netif_running(priv->mesh_dev))
 203                 netif_wake_queue(priv->mesh_dev);
 204 }
 205 EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);