tx.c revision a9bdce6564b25268af7315d3dd17f4f5b6435a45
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 checks the conditions and sends packet to IF 53 * layer if everything is ok. 54 * 55 * @param priv A pointer to struct lbs_private structure 56 * @param skb A pointer to skb which includes TX packet 57 * @return 0 or -1 58 */ 59static int lbs_process_tx(struct lbs_private *priv, struct sk_buff *skb) 60{ 61 int ret = -1; 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->tmptxbuf; 68 69 lbs_deb_enter(LBS_DEB_TX); 70 71 lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100)); 72 73 if (priv->dnld_sent) { 74 lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n", 75 priv->dnld_sent); 76 goto done; 77 } 78 79 if ((priv->psstate == PS_STATE_SLEEP) || 80 (priv->psstate == PS_STATE_PRE_SLEEP)) { 81 lbs_pr_alert("TX error: packet xmit in %ssleep mode\n", 82 priv->psstate == PS_STATE_SLEEP?"":"pre-"); 83 goto done; 84 } 85 86 if (priv->surpriseremoved) 87 return -1; 88 89 if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) { 90 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n", 91 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE); 92 goto done_tx; 93 } 94 95 ret = 0; 96 memset(plocaltxpd, 0, sizeof(struct txpd)); 97 98 plocaltxpd->tx_packet_length = cpu_to_le16(skb->len); 99 100 /* offset of actual data */ 101 plocaltxpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd)); 102 103 p802x_hdr = skb->data; 104 if (priv->monitormode != LBS_MONITOR_OFF) { 105 106 /* locate radiotap header */ 107 pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data; 108 109 /* set txpd fields from the radiotap header */ 110 new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate); 111 if (new_rate != 0) { 112 /* use new tx_control[4:0] */ 113 plocaltxpd->tx_control = cpu_to_le32(new_rate); 114 } 115 116 /* skip the radiotap header */ 117 p802x_hdr += sizeof(struct tx_radiotap_hdr); 118 plocaltxpd->tx_packet_length = 119 cpu_to_le16(le16_to_cpu(plocaltxpd->tx_packet_length) 120 - sizeof(struct tx_radiotap_hdr)); 121 122 } 123 /* copy destination address from 802.3 or 802.11 header */ 124 if (priv->monitormode != LBS_MONITOR_OFF) 125 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN); 126 else 127 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN); 128 129 lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) plocaltxpd, sizeof(struct txpd)); 130 131 if (IS_MESH_FRAME(skb)) { 132 plocaltxpd->tx_control |= cpu_to_le32(TxPD_MESH_FRAME); 133 } 134 135 memcpy(ptr, plocaltxpd, sizeof(struct txpd)); 136 137 ptr += sizeof(struct txpd); 138 139 lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(plocaltxpd->tx_packet_length)); 140 memcpy(ptr, p802x_hdr, le16_to_cpu(plocaltxpd->tx_packet_length)); 141 ret = priv->hw_host_to_card(priv, MVMS_DAT, 142 priv->tmptxbuf, 143 le16_to_cpu(plocaltxpd->tx_packet_length) + 144 sizeof(struct txpd)); 145 146 if (ret) { 147 lbs_deb_tx("tx err: hw_host_to_card returned 0x%X\n", ret); 148 goto done_tx; 149 } 150 151 lbs_deb_tx("%s succeeds\n", __func__); 152 153done_tx: 154 if (!ret) { 155 priv->stats.tx_packets++; 156 priv->stats.tx_bytes += skb->len; 157 } else { 158 priv->stats.tx_dropped++; 159 priv->stats.tx_errors++; 160 } 161 162 if (!ret && priv->monitormode != LBS_MONITOR_OFF) { 163 /* Keep the skb to echo it back once Tx feedback is 164 received from FW */ 165 skb_orphan(skb); 166 /* stop processing outgoing pkts */ 167 netif_stop_queue(priv->dev); 168 if (priv->mesh_dev) 169 netif_stop_queue(priv->mesh_dev); 170 171 /* Keep the skb around for when we get feedback */ 172 priv->currenttxskb = skb; 173 } else { 174 dev_kfree_skb_any(skb); 175 } 176 177done: 178 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret); 179 return ret; 180} 181 182int lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) 183{ 184 int ret = 0; 185 struct lbs_private *priv = dev->priv; 186 187 lbs_deb_enter(LBS_DEB_TX); 188 189 /* We could return NETDEV_TX_BUSY here, but I'd actually 190 like to get the point where we can BUG() */ 191 if (priv->dnld_sent) { 192 lbs_pr_err("%s while dnld_sent\n", __func__); 193 priv->stats.tx_dropped++; 194 goto done; 195 } 196 if (priv->currenttxskb) { 197 lbs_pr_err("%s while TX skb pending\n", __func__); 198 priv->stats.tx_dropped++; 199 goto done; 200 } 201 202 netif_stop_queue(priv->dev); 203 if (priv->mesh_dev) 204 netif_stop_queue(priv->mesh_dev); 205 206 if (lbs_process_tx(priv, skb) == 0) 207 dev->trans_start = jiffies; 208done: 209 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret); 210 return ret; 211} 212 213/** 214 * @brief This function sends to the host the last transmitted packet, 215 * filling the radiotap headers with transmission information. 216 * 217 * @param priv A pointer to struct lbs_private structure 218 * @param status A 32 bit value containing transmission status. 219 * 220 * @returns void 221 */ 222void lbs_send_tx_feedback(struct lbs_private *priv) 223{ 224 struct tx_radiotap_hdr *radiotap_hdr; 225 u32 status = priv->eventcause; 226 int txfail; 227 int try_count; 228 229 if (priv->monitormode == LBS_MONITOR_OFF || 230 priv->currenttxskb == NULL) 231 return; 232 233 radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data; 234 235 txfail = (status >> 24); 236 237#if 0 238 /* The version of roofnet that we've tested does not use this yet 239 * But it may be used in the future. 240 */ 241 if (txfail) 242 radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL; 243#endif 244 try_count = (status >> 16) & 0xff; 245 radiotap_hdr->data_retries = (try_count) ? 246 (1 + priv->txretrycount - try_count) : 0; 247 lbs_upload_rx_packet(priv, priv->currenttxskb); 248 priv->currenttxskb = NULL; 249 250 if (priv->connect_status == LBS_CONNECTED) 251 netif_wake_queue(priv->dev); 252 253 if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED)) 254 netif_wake_queue(priv->mesh_dev); 255} 256EXPORT_SYMBOL_GPL(lbs_send_tx_feedback); 257