1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This file contains the handling of TX in wlan driver. 4 */ 5 #include <linux/hardirq.h> 6 #include <linux/netdevice.h> 7 #include <linux/etherdevice.h> 8 #include <linux/sched.h> 9 #include <linux/export.h> 10 #include <net/cfg80211.h> 11 12 #include "host.h" 13 #include "radiotap.h" 14 #include "decl.h" 15 #include "defs.h" 16 #include "dev.h" 17 #include "mesh.h" 18 19 /** 20 * convert_radiotap_rate_to_mv - converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE 21 * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1) 22 * 23 * @rate: Input rate 24 * returns: Output Rate (0 if invalid) 25 */ 26 static u32 convert_radiotap_rate_to_mv(u8 rate) 27 { 28 switch (rate) { 29 case 2: /* 1 Mbps */ 30 return 0 | (1 << 4); 31 case 4: /* 2 Mbps */ 32 return 1 | (1 << 4); 33 case 11: /* 5.5 Mbps */ 34 return 2 | (1 << 4); 35 case 22: /* 11 Mbps */ 36 return 3 | (1 << 4); 37 case 12: /* 6 Mbps */ 38 return 4 | (1 << 4); 39 case 18: /* 9 Mbps */ 40 return 5 | (1 << 4); 41 case 24: /* 12 Mbps */ 42 return 6 | (1 << 4); 43 case 36: /* 18 Mbps */ 44 return 7 | (1 << 4); 45 case 48: /* 24 Mbps */ 46 return 8 | (1 << 4); 47 case 72: /* 36 Mbps */ 48 return 9 | (1 << 4); 49 case 96: /* 48 Mbps */ 50 return 10 | (1 << 4); 51 case 108: /* 54 Mbps */ 52 return 11 | (1 << 4); 53 } 54 return 0; 55 } 56 57 /** 58 * lbs_hard_start_xmit - checks the conditions and sends packet to IF 59 * layer if everything is ok 60 * 61 * @skb: A pointer to skb which includes TX packet 62 * @dev: A pointer to the &struct net_device 63 * returns: 0 or -1 64 */ 65 netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) 66 { 67 unsigned long flags; 68 struct lbs_private *priv = dev->ml_priv; 69 struct txpd *txpd; 70 char *p802x_hdr; 71 uint16_t pkt_len; 72 netdev_tx_t ret = NETDEV_TX_OK; 73 74 /* We need to protect against the queues being restarted before 75 we get round to stopping them */ 76 spin_lock_irqsave(&priv->driver_lock, flags); 77 78 if (priv->surpriseremoved) 79 goto free; 80 81 if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) { 82 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n", 83 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE); 84 /* We'll never manage to send this one; drop it and return 'OK' */ 85 86 dev->stats.tx_dropped++; 87 dev->stats.tx_errors++; 88 goto free; 89 } 90 91 92 netif_stop_queue(priv->dev); 93 if (priv->mesh_dev) 94 netif_stop_queue(priv->mesh_dev); 95 96 if (priv->tx_pending_len) { 97 /* This can happen if packets come in on the mesh and eth 98 device simultaneously -- there's no mutual exclusion on 99 hard_start_xmit() calls between devices. */ 100 lbs_deb_tx("Packet on %s while busy\n", dev->name); 101 ret = NETDEV_TX_BUSY; 102 goto unlock; 103 } 104 105 priv->tx_pending_len = -1; 106 spin_unlock_irqrestore(&priv->driver_lock, flags); 107 108 lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100)); 109 110 txpd = (void *)priv->tx_pending_buf; 111 memset(txpd, 0, sizeof(struct txpd)); 112 113 p802x_hdr = skb->data; 114 pkt_len = skb->len; 115 116 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) { 117 struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data; 118 119 /* set txpd fields from the radiotap header */ 120 txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate)); 121 122 /* skip the radiotap header */ 123 p802x_hdr += sizeof(*rtap_hdr); 124 pkt_len -= sizeof(*rtap_hdr); 125 126 /* copy destination address from 802.11 header */ 127 memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN); 128 } else { 129 /* copy destination address from 802.3 header */ 130 memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN); 131 } 132 133 txpd->tx_packet_length = cpu_to_le16(pkt_len); 134 txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd)); 135 136 lbs_mesh_set_txpd(priv, dev, txpd); 137 138 lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd)); 139 140 lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length)); 141 142 memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length)); 143 144 spin_lock_irqsave(&priv->driver_lock, flags); 145 priv->tx_pending_len = pkt_len + sizeof(struct txpd); 146 147 lbs_deb_tx("%s lined up packet\n", __func__); 148 149 dev->stats.tx_packets++; 150 dev->stats.tx_bytes += skb->len; 151 152 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) { 153 /* Keep the skb to echo it back once Tx feedback is 154 received from FW */ 155 skb_orphan(skb); 156 157 /* Keep the skb around for when we get feedback */ 158 priv->currenttxskb = skb; 159 } else { 160 free: 161 dev_kfree_skb_any(skb); 162 } 163 164 unlock: 165 spin_unlock_irqrestore(&priv->driver_lock, flags); 166 wake_up(&priv->waitq); 167 168 return ret; 169 } 170 171 /** 172 * lbs_send_tx_feedback - sends to the host the last transmitted packet, 173 * filling the radiotap headers with transmission information. 174 * 175 * @priv: A pointer to &struct lbs_private structure 176 * @try_count: A 32-bit value containing transmission retry status. 177 * 178 * returns: void 179 */ 180 void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count) 181 { 182 struct tx_radiotap_hdr *radiotap_hdr; 183 184 if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR || 185 priv->currenttxskb == NULL) 186 return; 187 188 radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data; 189 190 radiotap_hdr->data_retries = try_count ? 191 (1 + priv->txretrycount - try_count) : 0; 192 193 priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb, 194 priv->dev); 195 netif_rx(priv->currenttxskb); 196 197 priv->currenttxskb = NULL; 198 199 if (priv->connect_status == LBS_CONNECTED) 200 netif_wake_queue(priv->dev); 201 202 if (priv->mesh_dev && netif_running(priv->mesh_dev)) 203 netif_wake_queue(priv->mesh_dev); 204 } 205 EXPORT_SYMBOL_GPL(lbs_send_tx_feedback); 206