tx.c revision a6b7a407865aab9f849dd99a71072b7cd1175116
1/* 2 * This file contains the handling of TX in wlan driver. 3 */ 4#include <linux/hardirq.h> 5#include <linux/netdevice.h> 6#include <linux/etherdevice.h> 7#include <linux/sched.h> 8#include <net/cfg80211.h> 9 10#include "host.h" 11#include "radiotap.h" 12#include "decl.h" 13#include "defs.h" 14#include "dev.h" 15 16/** 17 * convert_radiotap_rate_to_mv - converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE 18 * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1) 19 * 20 * @rate: Input rate 21 * returns: Output Rate (0 if invalid) 22 */ 23static u32 convert_radiotap_rate_to_mv(u8 rate) 24{ 25 switch (rate) { 26 case 2: /* 1 Mbps */ 27 return 0 | (1 << 4); 28 case 4: /* 2 Mbps */ 29 return 1 | (1 << 4); 30 case 11: /* 5.5 Mbps */ 31 return 2 | (1 << 4); 32 case 22: /* 11 Mbps */ 33 return 3 | (1 << 4); 34 case 12: /* 6 Mbps */ 35 return 4 | (1 << 4); 36 case 18: /* 9 Mbps */ 37 return 5 | (1 << 4); 38 case 24: /* 12 Mbps */ 39 return 6 | (1 << 4); 40 case 36: /* 18 Mbps */ 41 return 7 | (1 << 4); 42 case 48: /* 24 Mbps */ 43 return 8 | (1 << 4); 44 case 72: /* 36 Mbps */ 45 return 9 | (1 << 4); 46 case 96: /* 48 Mbps */ 47 return 10 | (1 << 4); 48 case 108: /* 54 Mbps */ 49 return 11 | (1 << 4); 50 } 51 return 0; 52} 53 54/** 55 * lbs_hard_start_xmit - checks the conditions and sends packet to IF 56 * layer if everything is ok 57 * 58 * @skb: A pointer to skb which includes TX packet 59 * @dev: A pointer to the &struct net_device 60 * returns: 0 or -1 61 */ 62netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) 63{ 64 unsigned long flags; 65 struct lbs_private *priv = dev->ml_priv; 66 struct txpd *txpd; 67 char *p802x_hdr; 68 uint16_t pkt_len; 69 netdev_tx_t ret = NETDEV_TX_OK; 70 71 lbs_deb_enter(LBS_DEB_TX); 72 73 /* We need to protect against the queues being restarted before 74 we get round to stopping them */ 75 spin_lock_irqsave(&priv->driver_lock, flags); 76 77 if (priv->surpriseremoved) 78 goto free; 79 80 if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) { 81 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n", 82 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE); 83 /* We'll never manage to send this one; drop it and return 'OK' */ 84 85 dev->stats.tx_dropped++; 86 dev->stats.tx_errors++; 87 goto free; 88 } 89 90 91 netif_stop_queue(priv->dev); 92 if (priv->mesh_dev) 93 netif_stop_queue(priv->mesh_dev); 94 95 if (priv->tx_pending_len) { 96 /* This can happen if packets come in on the mesh and eth 97 device simultaneously -- there's no mutual exclusion on 98 hard_start_xmit() calls between devices. */ 99 lbs_deb_tx("Packet on %s while busy\n", dev->name); 100 ret = NETDEV_TX_BUSY; 101 goto unlock; 102 } 103 104 priv->tx_pending_len = -1; 105 spin_unlock_irqrestore(&priv->driver_lock, flags); 106 107 lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100)); 108 109 txpd = (void *)priv->tx_pending_buf; 110 memset(txpd, 0, sizeof(struct txpd)); 111 112 p802x_hdr = skb->data; 113 pkt_len = skb->len; 114 115 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) { 116 struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data; 117 118 /* set txpd fields from the radiotap header */ 119 txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate)); 120 121 /* skip the radiotap header */ 122 p802x_hdr += sizeof(*rtap_hdr); 123 pkt_len -= sizeof(*rtap_hdr); 124 125 /* copy destination address from 802.11 header */ 126 memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN); 127 } else { 128 /* copy destination address from 802.3 header */ 129 memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN); 130 } 131 132 txpd->tx_packet_length = cpu_to_le16(pkt_len); 133 txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd)); 134 135 lbs_mesh_set_txpd(priv, dev, txpd); 136 137 lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd)); 138 139 lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length)); 140 141 memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length)); 142 143 spin_lock_irqsave(&priv->driver_lock, flags); 144 priv->tx_pending_len = pkt_len + sizeof(struct txpd); 145 146 lbs_deb_tx("%s lined up packet\n", __func__); 147 148 dev->stats.tx_packets++; 149 dev->stats.tx_bytes += skb->len; 150 151 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) { 152 /* Keep the skb to echo it back once Tx feedback is 153 received from FW */ 154 skb_orphan(skb); 155 156 /* Keep the skb around for when we get feedback */ 157 priv->currenttxskb = skb; 158 } else { 159 free: 160 dev_kfree_skb_any(skb); 161 } 162 163 unlock: 164 spin_unlock_irqrestore(&priv->driver_lock, flags); 165 wake_up(&priv->waitq); 166 167 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret); 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 */ 180void 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 && lbs_mesh_connected(priv)) 203 netif_wake_queue(priv->mesh_dev); 204} 205EXPORT_SYMBOL_GPL(lbs_send_tx_feedback); 206