| 1 | /* |
| 2 | * This file contains the handling of TX in wlan driver. |
| 3 | */ |
| 4 | #include <linux/hardirq.h> |
| 5 | #include <linux/netdevice.h> |
| 6 | #include <linux/etherdevice.h> |
| 7 | #include <linux/sched.h> |
| 8 | #include <linux/export.h> |
| 9 | #include <net/cfg80211.h> |
| 10 | |
| 11 | #include "host.h" |
| 12 | #include "radiotap.h" |
| 13 | #include "decl.h" |
| 14 | #include "defs.h" |
| 15 | #include "dev.h" |
| 16 | #include "mesh.h" |
| 17 | |
| 18 | /** |
| 19 | * convert_radiotap_rate_to_mv - converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE |
| 20 | * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1) |
| 21 | * |
| 22 | * @rate: Input rate |
| 23 | * returns: Output Rate (0 if invalid) |
| 24 | */ |
| 25 | static u32 convert_radiotap_rate_to_mv(u8 rate) |
| 26 | { |
| 27 | switch (rate) { |
| 28 | case 2: /* 1 Mbps */ |
| 29 | return 0 | (1 << 4); |
| 30 | case 4: /* 2 Mbps */ |
| 31 | return 1 | (1 << 4); |
| 32 | case 11: /* 5.5 Mbps */ |
| 33 | return 2 | (1 << 4); |
| 34 | case 22: /* 11 Mbps */ |
| 35 | return 3 | (1 << 4); |
| 36 | case 12: /* 6 Mbps */ |
| 37 | return 4 | (1 << 4); |
| 38 | case 18: /* 9 Mbps */ |
| 39 | return 5 | (1 << 4); |
| 40 | case 24: /* 12 Mbps */ |
| 41 | return 6 | (1 << 4); |
| 42 | case 36: /* 18 Mbps */ |
| 43 | return 7 | (1 << 4); |
| 44 | case 48: /* 24 Mbps */ |
| 45 | return 8 | (1 << 4); |
| 46 | case 72: /* 36 Mbps */ |
| 47 | return 9 | (1 << 4); |
| 48 | case 96: /* 48 Mbps */ |
| 49 | return 10 | (1 << 4); |
| 50 | case 108: /* 54 Mbps */ |
| 51 | return 11 | (1 << 4); |
| 52 | } |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * lbs_hard_start_xmit - checks the conditions and sends packet to IF |
| 58 | * layer if everything is ok |
| 59 | * |
| 60 | * @skb: A pointer to skb which includes TX packet |
| 61 | * @dev: A pointer to the &struct net_device |
| 62 | * returns: 0 or -1 |
| 63 | */ |
| 64 | netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 65 | { |
| 66 | unsigned long flags; |
| 67 | struct lbs_private *priv = dev->ml_priv; |
| 68 | struct txpd *txpd; |
| 69 | char *p802x_hdr; |
| 70 | uint16_t pkt_len; |
| 71 | netdev_tx_t ret = NETDEV_TX_OK; |
| 72 | |
| 73 | lbs_deb_enter(LBS_DEB_TX); |
| 74 | |
| 75 | /* We need to protect against the queues being restarted before |
| 76 | we get round to stopping them */ |
| 77 | spin_lock_irqsave(&priv->driver_lock, flags); |
| 78 | |
| 79 | if (priv->surpriseremoved) |
| 80 | goto free; |
| 81 | |
| 82 | if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) { |
| 83 | lbs_deb_tx("tx err: skb length %d 0 or > %zd\n", |
| 84 | skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE); |
| 85 | /* We'll never manage to send this one; drop it and return 'OK' */ |
| 86 | |
| 87 | dev->stats.tx_dropped++; |
| 88 | dev->stats.tx_errors++; |
| 89 | goto free; |
| 90 | } |
| 91 | |
| 92 | |
| 93 | netif_stop_queue(priv->dev); |
| 94 | if (priv->mesh_dev) |
| 95 | netif_stop_queue(priv->mesh_dev); |
| 96 | |
| 97 | if (priv->tx_pending_len) { |
| 98 | /* This can happen if packets come in on the mesh and eth |
| 99 | device simultaneously -- there's no mutual exclusion on |
| 100 | hard_start_xmit() calls between devices. */ |
| 101 | lbs_deb_tx("Packet on %s while busy\n", dev->name); |
| 102 | ret = NETDEV_TX_BUSY; |
| 103 | goto unlock; |
| 104 | } |
| 105 | |
| 106 | priv->tx_pending_len = -1; |
| 107 | spin_unlock_irqrestore(&priv->driver_lock, flags); |
| 108 | |
| 109 | lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100)); |
| 110 | |
| 111 | txpd = (void *)priv->tx_pending_buf; |
| 112 | memset(txpd, 0, sizeof(struct txpd)); |
| 113 | |
| 114 | p802x_hdr = skb->data; |
| 115 | pkt_len = skb->len; |
| 116 | |
| 117 | if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) { |
| 118 | struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data; |
| 119 | |
| 120 | /* set txpd fields from the radiotap header */ |
| 121 | txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate)); |
| 122 | |
| 123 | /* skip the radiotap header */ |
| 124 | p802x_hdr += sizeof(*rtap_hdr); |
| 125 | pkt_len -= sizeof(*rtap_hdr); |
| 126 | |
| 127 | /* copy destination address from 802.11 header */ |
| 128 | memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN); |
| 129 | } else { |
| 130 | /* copy destination address from 802.3 header */ |
| 131 | memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN); |
| 132 | } |
| 133 | |
| 134 | txpd->tx_packet_length = cpu_to_le16(pkt_len); |
| 135 | txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd)); |
| 136 | |
| 137 | lbs_mesh_set_txpd(priv, dev, txpd); |
| 138 | |
| 139 | lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd)); |
| 140 | |
| 141 | lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length)); |
| 142 | |
| 143 | memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length)); |
| 144 | |
| 145 | spin_lock_irqsave(&priv->driver_lock, flags); |
| 146 | priv->tx_pending_len = pkt_len + sizeof(struct txpd); |
| 147 | |
| 148 | lbs_deb_tx("%s lined up packet\n", __func__); |
| 149 | |
| 150 | dev->stats.tx_packets++; |
| 151 | dev->stats.tx_bytes += skb->len; |
| 152 | |
| 153 | if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) { |
| 154 | /* Keep the skb to echo it back once Tx feedback is |
| 155 | received from FW */ |
| 156 | skb_orphan(skb); |
| 157 | |
| 158 | /* Keep the skb around for when we get feedback */ |
| 159 | priv->currenttxskb = skb; |
| 160 | } else { |
| 161 | free: |
| 162 | dev_kfree_skb_any(skb); |
| 163 | } |
| 164 | |
| 165 | unlock: |
| 166 | spin_unlock_irqrestore(&priv->driver_lock, flags); |
| 167 | wake_up(&priv->waitq); |
| 168 | |
| 169 | lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret); |
| 170 | return ret; |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * lbs_send_tx_feedback - sends to the host the last transmitted packet, |
| 175 | * filling the radiotap headers with transmission information. |
| 176 | * |
| 177 | * @priv: A pointer to &struct lbs_private structure |
| 178 | * @try_count: A 32-bit value containing transmission retry status. |
| 179 | * |
| 180 | * returns: void |
| 181 | */ |
| 182 | void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count) |
| 183 | { |
| 184 | struct tx_radiotap_hdr *radiotap_hdr; |
| 185 | |
| 186 | if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR || |
| 187 | priv->currenttxskb == NULL) |
| 188 | return; |
| 189 | |
| 190 | radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data; |
| 191 | |
| 192 | radiotap_hdr->data_retries = try_count ? |
| 193 | (1 + priv->txretrycount - try_count) : 0; |
| 194 | |
| 195 | priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb, |
| 196 | priv->dev); |
| 197 | netif_rx(priv->currenttxskb); |
| 198 | |
| 199 | priv->currenttxskb = NULL; |
| 200 | |
| 201 | if (priv->connect_status == LBS_CONNECTED) |
| 202 | netif_wake_queue(priv->dev); |
| 203 | |
| 204 | if (priv->mesh_dev && netif_running(priv->mesh_dev)) |
| 205 | netif_wake_queue(priv->mesh_dev); |
| 206 | } |
| 207 | EXPORT_SYMBOL_GPL(lbs_send_tx_feedback); |