tx.c revision 4269e2ad83036e1d8c076b1f1348f879a93be008
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 "sbi.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 processes a single packet and sends 54 * to IF layer 55 * 56 * @param priv A pointer to wlan_private structure 57 * @param skb A pointer to skb which includes TX packet 58 * @return 0 or -1 59 */ 60static int SendSinglePacket(wlan_private * priv, struct sk_buff *skb) 61{ 62 wlan_adapter *adapter = priv->adapter; 63 int ret = 0; 64 struct txpd localtxpd; 65 struct txpd *plocaltxpd = &localtxpd; 66 u8 *p802x_hdr; 67 struct tx_radiotap_hdr *pradiotap_hdr; 68 u32 new_rate; 69 u8 *ptr = priv->adapter->tmptxbuf; 70 71 ENTER(); 72 73 if (priv->adapter->surpriseremoved) 74 return -1; 75 76 if ((priv->adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0) 77 lbs_dbg_hex("TX packet: ", skb->data, 78 min_t(unsigned int, skb->len, 100)); 79 80 if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) { 81 lbs_pr_debug(1, "Tx error: Bad skb length %d : %zd\n", 82 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE); 83 ret = -1; 84 goto done; 85 } 86 87 memset(plocaltxpd, 0, sizeof(struct txpd)); 88 89 plocaltxpd->tx_packet_length = skb->len; 90 91 /* offset of actual data */ 92 plocaltxpd->tx_packet_location = sizeof(struct txpd); 93 94 /* TxCtrl set by user or default */ 95 plocaltxpd->tx_control = adapter->pkttxctrl; 96 97 p802x_hdr = skb->data; 98 if (priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) { 99 100 /* locate radiotap header */ 101 pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data; 102 103 /* set txpd fields from the radiotap header */ 104 new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate); 105 if (new_rate != 0) { 106 /* erase tx_control[4:0] */ 107 plocaltxpd->tx_control &= ~0x1f; 108 /* write new tx_control[4:0] */ 109 plocaltxpd->tx_control |= new_rate; 110 } 111 112 /* skip the radiotap header */ 113 p802x_hdr += sizeof(struct tx_radiotap_hdr); 114 plocaltxpd->tx_packet_length -= sizeof(struct tx_radiotap_hdr); 115 116 } 117 /* copy destination address from 802.3 or 802.11 header */ 118 if (priv->adapter->linkmode == WLAN_LINKMODE_802_11) 119 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN); 120 else 121 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN); 122 123 lbs_dbg_hex("txpd", (u8 *) plocaltxpd, sizeof(struct txpd)); 124 125 if (IS_MESH_FRAME(skb)) { 126 plocaltxpd->tx_control |= TxPD_MESH_FRAME; 127 } 128 129 memcpy(ptr, plocaltxpd, sizeof(struct txpd)); 130 131 ptr += sizeof(struct txpd); 132 133 lbs_dbg_hex("Tx Data", (u8 *) p802x_hdr, plocaltxpd->tx_packet_length); 134 memcpy(ptr, p802x_hdr, plocaltxpd->tx_packet_length); 135 ret = libertas_sbi_host_to_card(priv, MVMS_DAT, 136 priv->adapter->tmptxbuf, 137 plocaltxpd->tx_packet_length + 138 sizeof(struct txpd)); 139 140 if (ret) { 141 lbs_pr_debug(1, "Tx error: libertas_sbi_host_to_card failed: 0x%X\n", ret); 142 goto done; 143 } 144 145 lbs_pr_debug(1, "SendSinglePacket succeeds\n"); 146 147 done: 148 if (!ret) { 149 priv->stats.tx_packets++; 150 priv->stats.tx_bytes += skb->len; 151 } else { 152 priv->stats.tx_dropped++; 153 priv->stats.tx_errors++; 154 } 155 156 if (!ret && priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) { 157 /* Keep the skb to echo it back once Tx feedback is 158 received from FW */ 159 skb_orphan(skb); 160 /* stop processing outgoing pkts */ 161 netif_stop_queue(priv->wlan_dev.netdev); 162 /* freeze any packets already in our queues */ 163 priv->adapter->TxLockFlag = 1; 164 } else { 165 dev_kfree_skb_any(skb); 166 priv->adapter->currenttxskb = NULL; 167 } 168 169 LEAVE(); 170 return ret; 171} 172 173 174void libertas_tx_runqueue(wlan_private *priv) 175{ 176 wlan_adapter *adapter = priv->adapter; 177 int i; 178 179 spin_lock(&adapter->txqueue_lock); 180 for (i = 0; i < adapter->tx_queue_idx; i++) { 181 struct sk_buff *skb = adapter->tx_queue_ps[i]; 182 spin_unlock(&adapter->txqueue_lock); 183 SendSinglePacket(priv, skb); 184 spin_lock(&adapter->txqueue_lock); 185 } 186 adapter->tx_queue_idx = 0; 187 spin_unlock(&adapter->txqueue_lock); 188} 189 190static void wlan_tx_queue(wlan_private *priv, struct sk_buff *skb) 191{ 192 wlan_adapter *adapter = priv->adapter; 193 194 spin_lock(&adapter->txqueue_lock); 195 196 WARN_ON(priv->adapter->tx_queue_idx >= NR_TX_QUEUE); 197 adapter->tx_queue_ps[adapter->tx_queue_idx++] = skb; 198 if (adapter->tx_queue_idx == NR_TX_QUEUE) 199 netif_stop_queue(priv->wlan_dev.netdev); 200 else 201 netif_start_queue(priv->wlan_dev.netdev); 202 203 spin_unlock(&adapter->txqueue_lock); 204} 205 206/** 207 * @brief This function checks the conditions and sends packet to IF 208 * layer if everything is ok. 209 * 210 * @param priv A pointer to wlan_private structure 211 * @return n/a 212 */ 213int libertas_process_tx(wlan_private * priv, struct sk_buff *skb) 214{ 215 int ret = -1; 216 217 ENTER(); 218 219 lbs_dbg_hex("TX Data", skb->data, min_t(unsigned int, skb->len, 100)); 220 221 if (priv->wlan_dev.dnld_sent) { 222 lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n", 223 priv->wlan_dev.dnld_sent); 224 goto done; 225 } 226 227 if ((priv->adapter->psstate == PS_STATE_SLEEP) || 228 (priv->adapter->psstate == PS_STATE_PRE_SLEEP)) { 229 wlan_tx_queue(priv, skb); 230 return ret; 231 } 232 233 priv->adapter->currenttxskb = skb; 234 235 ret = SendSinglePacket(priv, skb); 236done: 237 LEAVE(); 238 return ret; 239} 240 241/** 242 * @brief This function sends to the host the last transmitted packet, 243 * filling the radiotap headers with transmission information. 244 * 245 * @param priv A pointer to wlan_private structure 246 * @param status A 32 bit value containing transmission status. 247 * 248 * @returns void 249 */ 250void libertas_send_tx_feedback(wlan_private * priv) 251{ 252 wlan_adapter *adapter = priv->adapter; 253 struct tx_radiotap_hdr *radiotap_hdr; 254 u32 status = adapter->eventcause; 255 int txfail; 256 int try_count; 257 258 if (adapter->radiomode != WLAN_RADIOMODE_RADIOTAP || 259 adapter->currenttxskb == NULL) 260 return; 261 262 radiotap_hdr = (struct tx_radiotap_hdr *)adapter->currenttxskb->data; 263 264 if ((adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0) 265 lbs_dbg_hex("TX feedback: ", (u8 *) radiotap_hdr, 266 min_t(unsigned int, adapter->currenttxskb->len, 100)); 267 268 txfail = (status >> 24); 269 270#if 0 271 /* The version of roofnet that we've tested does not use this yet 272 * But it may be used in the future. 273 */ 274 if (txfail) 275 radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL; 276#endif 277 try_count = (status >> 16) & 0xff; 278 radiotap_hdr->data_retries = (try_count) ? 279 (1 + adapter->txretrycount - try_count) : 0; 280 libertas_upload_rx_packet(priv, adapter->currenttxskb); 281 adapter->currenttxskb = NULL; 282 priv->adapter->TxLockFlag = 0; 283 if (priv->adapter->connect_status == libertas_connected) 284 netif_wake_queue(priv->wlan_dev.netdev); 285} 286