tx.c revision 6f93a8e7e41c2d29749242f983f41e3f6a75b40b
1/** 2 * This file contains the handling of TX in wlan driver. 3 */ 4#include <linux/netdevice.h> 5#include <linux/etherdevice.h> 6 7#include "hostcmd.h" 8#include "radiotap.h" 9#include "decl.h" 10#include "defs.h" 11#include "dev.h" 12#include "wext.h" 13 14/** 15 * @brief This function converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE 16 * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1) 17 * 18 * @param rate Input rate 19 * @return Output Rate (0 if invalid) 20 */ 21static u32 convert_radiotap_rate_to_mv(u8 rate) 22{ 23 switch (rate) { 24 case 2: /* 1 Mbps */ 25 return 0 | (1 << 4); 26 case 4: /* 2 Mbps */ 27 return 1 | (1 << 4); 28 case 11: /* 5.5 Mbps */ 29 return 2 | (1 << 4); 30 case 22: /* 11 Mbps */ 31 return 3 | (1 << 4); 32 case 12: /* 6 Mbps */ 33 return 4 | (1 << 4); 34 case 18: /* 9 Mbps */ 35 return 5 | (1 << 4); 36 case 24: /* 12 Mbps */ 37 return 6 | (1 << 4); 38 case 36: /* 18 Mbps */ 39 return 7 | (1 << 4); 40 case 48: /* 24 Mbps */ 41 return 8 | (1 << 4); 42 case 72: /* 36 Mbps */ 43 return 9 | (1 << 4); 44 case 96: /* 48 Mbps */ 45 return 10 | (1 << 4); 46 case 108: /* 54 Mbps */ 47 return 11 | (1 << 4); 48 } 49 return 0; 50} 51 52/** 53 * @brief This function checks the conditions and sends packet to IF 54 * layer if everything is ok. 55 * 56 * @param priv A pointer to struct lbs_private structure 57 * @param skb A pointer to skb which includes TX packet 58 * @return 0 or -1 59 */ 60int lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) 61{ 62 unsigned long flags; 63 struct lbs_private *priv = dev->priv; 64 struct txpd *txpd; 65 char *p802x_hdr; 66 uint16_t pkt_len; 67 int ret; 68 69 lbs_deb_enter(LBS_DEB_TX); 70 71 ret = NETDEV_TX_OK; 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 priv->stats.tx_dropped++; 86 priv->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 (dev == priv->rtap_net_dev) { 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 if (dev == priv->mesh_dev) 136 txpd->tx_control |= cpu_to_le32(TxPD_MESH_FRAME); 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 priv->stats.tx_packets++; 150 priv->stats.tx_bytes += skb->len; 151 152 dev->trans_start = jiffies; 153 154 if (priv->monitormode != LBS_MONITOR_OFF) { 155 /* Keep the skb to echo it back once Tx feedback is 156 received from FW */ 157 skb_orphan(skb); 158 159 /* Keep the skb around for when we get feedback */ 160 priv->currenttxskb = skb; 161 } else { 162 free: 163 dev_kfree_skb_any(skb); 164 } 165 unlock: 166 spin_unlock_irqrestore(&priv->driver_lock, flags); 167 wake_up(&priv->waitq); 168 169 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret); 170 return ret; 171} 172 173/** 174 * @brief This function sends to the host the last transmitted packet, 175 * filling the radiotap headers with transmission information. 176 * 177 * @param priv A pointer to struct lbs_private structure 178 * @param status A 32 bit value containing transmission status. 179 * 180 * @returns void 181 */ 182void lbs_send_tx_feedback(struct lbs_private *priv) 183{ 184 struct tx_radiotap_hdr *radiotap_hdr; 185 u32 status = priv->eventcause; 186 int txfail; 187 int try_count; 188 189 if (priv->monitormode == LBS_MONITOR_OFF || 190 priv->currenttxskb == NULL) 191 return; 192 193 radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data; 194 195 txfail = (status >> 24); 196 197#if 0 198 /* The version of roofnet that we've tested does not use this yet 199 * But it may be used in the future. 200 */ 201 if (txfail) 202 radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL; 203#endif 204 try_count = (status >> 16) & 0xff; 205 radiotap_hdr->data_retries = (try_count) ? 206 (1 + priv->txretrycount - try_count) : 0; 207 208 209 priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb, 210 priv->rtap_net_dev); 211 netif_rx(priv->currenttxskb); 212 213 priv->currenttxskb = NULL; 214 215 if (priv->connect_status == LBS_CONNECTED) 216 netif_wake_queue(priv->dev); 217 218 if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED)) 219 netif_wake_queue(priv->mesh_dev); 220} 221EXPORT_SYMBOL_GPL(lbs_send_tx_feedback); 222