tx.c revision 0aef64d75851c9f3545d0793f26486ed862306d8
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 wlan_adapter *adapter = priv->adapter; 62 int ret = 0; 63 struct txpd localtxpd; 64 struct txpd *plocaltxpd = &localtxpd; 65 u8 *p802x_hdr; 66 struct tx_radiotap_hdr *pradiotap_hdr; 67 u32 new_rate; 68 u8 *ptr = priv->adapter->tmptxbuf; 69 70 lbs_deb_enter(LBS_DEB_TX); 71 72 if (priv->adapter->surpriseremoved) 73 return -1; 74 75 if ((priv->adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0) 76 lbs_dbg_hex("TX packet: ", skb->data, 77 min_t(unsigned int, skb->len, 100)); 78 79 if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) { 80 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n", 81 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE); 82 ret = -1; 83 goto done; 84 } 85 86 memset(plocaltxpd, 0, sizeof(struct txpd)); 87 88 plocaltxpd->tx_packet_length = cpu_to_le16(skb->len); 89 90 /* offset of actual data */ 91 plocaltxpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd)); 92 93 /* TxCtrl set by user or default */ 94 plocaltxpd->tx_control = cpu_to_le32(adapter->pkttxctrl); 95 96 p802x_hdr = skb->data; 97 if (priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) { 98 99 /* locate radiotap header */ 100 pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data; 101 102 /* set txpd fields from the radiotap header */ 103 new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate); 104 if (new_rate != 0) { 105 /* use new tx_control[4:0] */ 106 new_rate |= (adapter->pkttxctrl & ~0x1f); 107 plocaltxpd->tx_control = cpu_to_le32(new_rate); 108 } 109 110 /* skip the radiotap header */ 111 p802x_hdr += sizeof(struct tx_radiotap_hdr); 112 plocaltxpd->tx_packet_length = 113 cpu_to_le16(le16_to_cpu(plocaltxpd->tx_packet_length) 114 - 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 |= cpu_to_le32(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, le16_to_cpu(plocaltxpd->tx_packet_length)); 134 memcpy(ptr, p802x_hdr, le16_to_cpu(plocaltxpd->tx_packet_length)); 135 ret = priv->hw_host_to_card(priv, MVMS_DAT, 136 priv->adapter->tmptxbuf, 137 le16_to_cpu(plocaltxpd->tx_packet_length) + 138 sizeof(struct txpd)); 139 140 if (ret) { 141 lbs_deb_tx("tx err: hw_host_to_card returned 0x%X\n", ret); 142 goto done; 143 } 144 145 lbs_deb_tx("SendSinglePacket succeeds\n"); 146 147done: 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->dev); 162 netif_stop_queue(priv->mesh_dev); 163 /* freeze any packets already in our queues */ 164 priv->adapter->TxLockFlag = 1; 165 } else { 166 dev_kfree_skb_any(skb); 167 priv->adapter->currenttxskb = NULL; 168 } 169 170 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret); 171 return ret; 172} 173 174 175void libertas_tx_runqueue(wlan_private *priv) 176{ 177 wlan_adapter *adapter = priv->adapter; 178 int i; 179 180 spin_lock(&adapter->txqueue_lock); 181 for (i = 0; i < adapter->tx_queue_idx; i++) { 182 struct sk_buff *skb = adapter->tx_queue_ps[i]; 183 spin_unlock(&adapter->txqueue_lock); 184 SendSinglePacket(priv, skb); 185 spin_lock(&adapter->txqueue_lock); 186 } 187 adapter->tx_queue_idx = 0; 188 spin_unlock(&adapter->txqueue_lock); 189} 190 191static void wlan_tx_queue(wlan_private *priv, struct sk_buff *skb) 192{ 193 wlan_adapter *adapter = priv->adapter; 194 195 spin_lock(&adapter->txqueue_lock); 196 197 WARN_ON(priv->adapter->tx_queue_idx >= NR_TX_QUEUE); 198 adapter->tx_queue_ps[adapter->tx_queue_idx++] = skb; 199 if (adapter->tx_queue_idx == NR_TX_QUEUE) { 200 netif_stop_queue(priv->dev); 201 netif_stop_queue(priv->mesh_dev); 202 } else { 203 netif_start_queue(priv->dev); 204 netif_start_queue(priv->mesh_dev); 205 } 206 207 spin_unlock(&adapter->txqueue_lock); 208} 209 210/** 211 * @brief This function checks the conditions and sends packet to IF 212 * layer if everything is ok. 213 * 214 * @param priv A pointer to wlan_private structure 215 * @return n/a 216 */ 217int libertas_process_tx(wlan_private * priv, struct sk_buff *skb) 218{ 219 int ret = -1; 220 221 lbs_deb_enter(LBS_DEB_TX); 222 lbs_dbg_hex("TX Data", skb->data, min_t(unsigned int, skb->len, 100)); 223 224 if (priv->dnld_sent) { 225 lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n", 226 priv->dnld_sent); 227 goto done; 228 } 229 230 if ((priv->adapter->psstate == PS_STATE_SLEEP) || 231 (priv->adapter->psstate == PS_STATE_PRE_SLEEP)) { 232 wlan_tx_queue(priv, skb); 233 return ret; 234 } 235 236 priv->adapter->currenttxskb = skb; 237 238 ret = SendSinglePacket(priv, skb); 239done: 240 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret); 241 return ret; 242} 243 244/** 245 * @brief This function sends to the host the last transmitted packet, 246 * filling the radiotap headers with transmission information. 247 * 248 * @param priv A pointer to wlan_private structure 249 * @param status A 32 bit value containing transmission status. 250 * 251 * @returns void 252 */ 253void libertas_send_tx_feedback(wlan_private * priv) 254{ 255 wlan_adapter *adapter = priv->adapter; 256 struct tx_radiotap_hdr *radiotap_hdr; 257 u32 status = adapter->eventcause; 258 int txfail; 259 int try_count; 260 261 if (adapter->radiomode != WLAN_RADIOMODE_RADIOTAP || 262 adapter->currenttxskb == NULL) 263 return; 264 265 radiotap_hdr = (struct tx_radiotap_hdr *)adapter->currenttxskb->data; 266 267 if ((adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0) 268 lbs_dbg_hex("TX feedback: ", (u8 *) radiotap_hdr, 269 min_t(unsigned int, adapter->currenttxskb->len, 100)); 270 271 txfail = (status >> 24); 272 273#if 0 274 /* The version of roofnet that we've tested does not use this yet 275 * But it may be used in the future. 276 */ 277 if (txfail) 278 radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL; 279#endif 280 try_count = (status >> 16) & 0xff; 281 radiotap_hdr->data_retries = (try_count) ? 282 (1 + adapter->txretrycount - try_count) : 0; 283 libertas_upload_rx_packet(priv, adapter->currenttxskb); 284 adapter->currenttxskb = NULL; 285 priv->adapter->TxLockFlag = 0; 286 if (priv->adapter->connect_status == LIBERTAS_CONNECTED) { 287 netif_wake_queue(priv->dev); 288 netif_wake_queue(priv->mesh_dev); 289 } 290} 291EXPORT_SYMBOL_GPL(libertas_send_tx_feedback); 292