tx.c revision ece561919326236c7fb791a5e883f0eb76af029e
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 (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) { 76 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n", 77 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE); 78 ret = -1; 79 goto done; 80 } 81 82 memset(plocaltxpd, 0, sizeof(struct txpd)); 83 84 plocaltxpd->tx_packet_length = cpu_to_le16(skb->len); 85 86 /* offset of actual data */ 87 plocaltxpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd)); 88 89 /* TxCtrl set by user or default */ 90 plocaltxpd->tx_control = cpu_to_le32(adapter->pkttxctrl); 91 92 p802x_hdr = skb->data; 93 if (priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) { 94 95 /* locate radiotap header */ 96 pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data; 97 98 /* set txpd fields from the radiotap header */ 99 new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate); 100 if (new_rate != 0) { 101 /* use new tx_control[4:0] */ 102 new_rate |= (adapter->pkttxctrl & ~0x1f); 103 plocaltxpd->tx_control = cpu_to_le32(new_rate); 104 } 105 106 /* skip the radiotap header */ 107 p802x_hdr += sizeof(struct tx_radiotap_hdr); 108 plocaltxpd->tx_packet_length = 109 cpu_to_le16(le16_to_cpu(plocaltxpd->tx_packet_length) 110 - sizeof(struct tx_radiotap_hdr)); 111 112 } 113 /* copy destination address from 802.3 or 802.11 header */ 114 if (priv->adapter->linkmode == WLAN_LINKMODE_802_11) 115 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN); 116 else 117 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN); 118 119 lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) plocaltxpd, sizeof(struct txpd)); 120 121 if (IS_MESH_FRAME(skb)) { 122 plocaltxpd->tx_control |= cpu_to_le32(TxPD_MESH_FRAME); 123 } 124 125 memcpy(ptr, plocaltxpd, sizeof(struct txpd)); 126 127 ptr += sizeof(struct txpd); 128 129 lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(plocaltxpd->tx_packet_length)); 130 memcpy(ptr, p802x_hdr, le16_to_cpu(plocaltxpd->tx_packet_length)); 131 ret = priv->hw_host_to_card(priv, MVMS_DAT, 132 priv->adapter->tmptxbuf, 133 le16_to_cpu(plocaltxpd->tx_packet_length) + 134 sizeof(struct txpd)); 135 136 if (ret) { 137 lbs_deb_tx("tx err: hw_host_to_card returned 0x%X\n", ret); 138 goto done; 139 } 140 141 lbs_deb_tx("SendSinglePacket succeeds\n"); 142 143done: 144 if (!ret) { 145 priv->stats.tx_packets++; 146 priv->stats.tx_bytes += skb->len; 147 } else { 148 priv->stats.tx_dropped++; 149 priv->stats.tx_errors++; 150 } 151 152 if (!ret && priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) { 153 /* Keep the skb to echo it back once Tx feedback is 154 received from FW */ 155 skb_orphan(skb); 156 /* stop processing outgoing pkts */ 157 netif_stop_queue(priv->dev); 158 if (priv->mesh_dev) 159 netif_stop_queue(priv->mesh_dev); 160 /* freeze any packets already in our queues */ 161 priv->adapter->TxLockFlag = 1; 162 } else { 163 dev_kfree_skb_any(skb); 164 priv->adapter->currenttxskb = NULL; 165 } 166 167 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret); 168 return ret; 169} 170 171 172void libertas_tx_runqueue(wlan_private *priv) 173{ 174 wlan_adapter *adapter = priv->adapter; 175 int i; 176 177 spin_lock(&adapter->txqueue_lock); 178 for (i = 0; i < adapter->tx_queue_idx; i++) { 179 struct sk_buff *skb = adapter->tx_queue_ps[i]; 180 spin_unlock(&adapter->txqueue_lock); 181 SendSinglePacket(priv, skb); 182 spin_lock(&adapter->txqueue_lock); 183 } 184 adapter->tx_queue_idx = 0; 185 spin_unlock(&adapter->txqueue_lock); 186} 187 188static void wlan_tx_queue(wlan_private *priv, struct sk_buff *skb) 189{ 190 wlan_adapter *adapter = priv->adapter; 191 192 spin_lock(&adapter->txqueue_lock); 193 194 WARN_ON(priv->adapter->tx_queue_idx >= NR_TX_QUEUE); 195 adapter->tx_queue_ps[adapter->tx_queue_idx++] = skb; 196 if (adapter->tx_queue_idx == NR_TX_QUEUE) { 197 netif_stop_queue(priv->dev); 198 if (priv->mesh_dev) 199 netif_stop_queue(priv->mesh_dev); 200 } else { 201 netif_start_queue(priv->dev); 202 if (priv->mesh_dev) 203 netif_start_queue(priv->mesh_dev); 204 } 205 206 spin_unlock(&adapter->txqueue_lock); 207} 208 209/** 210 * @brief This function checks the conditions and sends packet to IF 211 * layer if everything is ok. 212 * 213 * @param priv A pointer to wlan_private structure 214 * @return n/a 215 */ 216int libertas_process_tx(wlan_private * priv, struct sk_buff *skb) 217{ 218 int ret = -1; 219 220 lbs_deb_enter(LBS_DEB_TX); 221 lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100)); 222 223 if (priv->dnld_sent) { 224 lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n", 225 priv->dnld_sent); 226 goto done; 227 } 228 229 if ((priv->adapter->psstate == PS_STATE_SLEEP) || 230 (priv->adapter->psstate == PS_STATE_PRE_SLEEP)) { 231 wlan_tx_queue(priv, skb); 232 return ret; 233 } 234 235 priv->adapter->currenttxskb = skb; 236 237 ret = SendSinglePacket(priv, skb); 238done: 239 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret); 240 return ret; 241} 242 243/** 244 * @brief This function sends to the host the last transmitted packet, 245 * filling the radiotap headers with transmission information. 246 * 247 * @param priv A pointer to wlan_private structure 248 * @param status A 32 bit value containing transmission status. 249 * 250 * @returns void 251 */ 252void libertas_send_tx_feedback(wlan_private * priv) 253{ 254 wlan_adapter *adapter = priv->adapter; 255 struct tx_radiotap_hdr *radiotap_hdr; 256 u32 status = adapter->eventcause; 257 int txfail; 258 int try_count; 259 260 if (adapter->radiomode != WLAN_RADIOMODE_RADIOTAP || 261 adapter->currenttxskb == NULL) 262 return; 263 264 radiotap_hdr = (struct tx_radiotap_hdr *)adapter->currenttxskb->data; 265 266 txfail = (status >> 24); 267 268#if 0 269 /* The version of roofnet that we've tested does not use this yet 270 * But it may be used in the future. 271 */ 272 if (txfail) 273 radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL; 274#endif 275 try_count = (status >> 16) & 0xff; 276 radiotap_hdr->data_retries = (try_count) ? 277 (1 + adapter->txretrycount - try_count) : 0; 278 libertas_upload_rx_packet(priv, adapter->currenttxskb); 279 adapter->currenttxskb = NULL; 280 priv->adapter->TxLockFlag = 0; 281 if (priv->adapter->connect_status == LIBERTAS_CONNECTED) { 282 netif_wake_queue(priv->dev); 283 if (priv->mesh_dev) 284 netif_wake_queue(priv->mesh_dev); 285 } 286} 287EXPORT_SYMBOL_GPL(libertas_send_tx_feedback); 288