tx.c revision 965f8bbc6c92233600b176f4c80299f6766df9bd
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 */ 20static 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 */ 59static 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->monitormode != WLAN_MONITOR_OFF) { 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->monitormode != WLAN_MONITOR_OFF) 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 138done: 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->monitormode != WLAN_MONITOR_OFF) { 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 167void 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 183static 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 */ 211int 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); 233done: 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 */ 247void 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->monitormode == WLAN_MONITOR_OFF || 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} 282EXPORT_SYMBOL_GPL(libertas_send_tx_feedback); 283