Randy Dunlap | 8973a6e | 2011-04-26 15:25:29 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file contains the handling of TX in wlan driver. |
| 3 | */ |
Alexey Dobriyan | a6b7a40 | 2011-06-06 10:43:46 +0000 | [diff] [blame] | 4 | #include <linux/hardirq.h> |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 5 | #include <linux/netdevice.h> |
David Woodhouse | 6f93a8e | 2007-12-10 00:49:26 -0500 | [diff] [blame] | 6 | #include <linux/etherdevice.h> |
Alexey Dobriyan | d43c36d | 2009-10-07 17:09:06 +0400 | [diff] [blame] | 7 | #include <linux/sched.h> |
Kiran Divekar | e86dc1c | 2010-06-14 22:01:26 +0530 | [diff] [blame] | 8 | #include <net/cfg80211.h> |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 9 | |
Holger Schurig | 9e66e70 | 2009-10-16 17:32:16 +0200 | [diff] [blame] | 10 | #include "host.h" |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 11 | #include "radiotap.h" |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 12 | #include "decl.h" |
| 13 | #include "defs.h" |
| 14 | #include "dev.h" |
Daniel Drake | 49fee69 | 2011-07-21 20:43:17 +0100 | [diff] [blame] | 15 | #include "mesh.h" |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 16 | |
| 17 | /** |
Randy Dunlap | 8973a6e | 2011-04-26 15:25:29 -0700 | [diff] [blame] | 18 | * convert_radiotap_rate_to_mv - converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE |
| 19 | * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1) |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 20 | * |
Randy Dunlap | 8973a6e | 2011-04-26 15:25:29 -0700 | [diff] [blame] | 21 | * @rate: Input rate |
| 22 | * returns: Output Rate (0 if invalid) |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 23 | */ |
| 24 | static u32 convert_radiotap_rate_to_mv(u8 rate) |
| 25 | { |
| 26 | switch (rate) { |
| 27 | case 2: /* 1 Mbps */ |
| 28 | return 0 | (1 << 4); |
| 29 | case 4: /* 2 Mbps */ |
| 30 | return 1 | (1 << 4); |
| 31 | case 11: /* 5.5 Mbps */ |
| 32 | return 2 | (1 << 4); |
| 33 | case 22: /* 11 Mbps */ |
| 34 | return 3 | (1 << 4); |
| 35 | case 12: /* 6 Mbps */ |
| 36 | return 4 | (1 << 4); |
| 37 | case 18: /* 9 Mbps */ |
| 38 | return 5 | (1 << 4); |
| 39 | case 24: /* 12 Mbps */ |
| 40 | return 6 | (1 << 4); |
| 41 | case 36: /* 18 Mbps */ |
| 42 | return 7 | (1 << 4); |
| 43 | case 48: /* 24 Mbps */ |
| 44 | return 8 | (1 << 4); |
| 45 | case 72: /* 36 Mbps */ |
| 46 | return 9 | (1 << 4); |
| 47 | case 96: /* 48 Mbps */ |
| 48 | return 10 | (1 << 4); |
| 49 | case 108: /* 54 Mbps */ |
| 50 | return 11 | (1 << 4); |
| 51 | } |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | /** |
Randy Dunlap | 8973a6e | 2011-04-26 15:25:29 -0700 | [diff] [blame] | 56 | * lbs_hard_start_xmit - checks the conditions and sends packet to IF |
| 57 | * layer if everything is ok |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 58 | * |
Randy Dunlap | 8973a6e | 2011-04-26 15:25:29 -0700 | [diff] [blame] | 59 | * @skb: A pointer to skb which includes TX packet |
| 60 | * @dev: A pointer to the &struct net_device |
| 61 | * returns: 0 or -1 |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 62 | */ |
Stephen Hemminger | d0cf9c0 | 2009-08-31 19:50:57 +0000 | [diff] [blame] | 63 | netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 64 | { |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 65 | unsigned long flags; |
Kiran Divekar | ab65f64 | 2009-02-19 19:32:39 -0500 | [diff] [blame] | 66 | struct lbs_private *priv = dev->ml_priv; |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 67 | struct txpd *txpd; |
| 68 | char *p802x_hdr; |
| 69 | uint16_t pkt_len; |
Stephen Hemminger | d0cf9c0 | 2009-08-31 19:50:57 +0000 | [diff] [blame] | 70 | netdev_tx_t ret = NETDEV_TX_OK; |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 71 | |
Holger Schurig | 9012b28 | 2007-05-25 11:27:16 -0400 | [diff] [blame] | 72 | lbs_deb_enter(LBS_DEB_TX); |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 73 | |
David Woodhouse | 2eb188a | 2007-12-09 23:54:27 -0500 | [diff] [blame] | 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); |
David Woodhouse | 6b4a7e0 | 2007-12-09 12:48:10 -0500 | [diff] [blame] | 77 | |
David Woodhouse | aa21c00 | 2007-12-08 20:04:36 +0000 | [diff] [blame] | 78 | if (priv->surpriseremoved) |
David Woodhouse | 2eb188a | 2007-12-09 23:54:27 -0500 | [diff] [blame] | 79 | goto free; |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 80 | |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 81 | if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) { |
Holger Schurig | 9012b28 | 2007-05-25 11:27:16 -0400 | [diff] [blame] | 82 | lbs_deb_tx("tx err: skb length %d 0 or > %zd\n", |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 83 | skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE); |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 84 | /* We'll never manage to send this one; drop it and return 'OK' */ |
David Woodhouse | 2eb188a | 2007-12-09 23:54:27 -0500 | [diff] [blame] | 85 | |
Stephen Hemminger | bbfc6b7 | 2009-03-20 19:36:36 +0000 | [diff] [blame] | 86 | dev->stats.tx_dropped++; |
| 87 | dev->stats.tx_errors++; |
David Woodhouse | 2eb188a | 2007-12-09 23:54:27 -0500 | [diff] [blame] | 88 | goto free; |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 89 | } |
| 90 | |
David Woodhouse | 2eb188a | 2007-12-09 23:54:27 -0500 | [diff] [blame] | 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) { |
David Woodhouse | 7e22627 | 2007-12-14 22:53:41 -0500 | [diff] [blame] | 97 | /* This can happen if packets come in on the mesh and eth |
| 98 | device simultaneously -- there's no mutual exclusion on |
David Woodhouse | 2eb188a | 2007-12-09 23:54:27 -0500 | [diff] [blame] | 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 | |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 108 | lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100)); |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 109 | |
David Woodhouse | 2eb188a | 2007-12-09 23:54:27 -0500 | [diff] [blame] | 110 | txpd = (void *)priv->tx_pending_buf; |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 111 | memset(txpd, 0, sizeof(struct txpd)); |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 112 | |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 113 | p802x_hdr = skb->data; |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 114 | pkt_len = skb->len; |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 115 | |
Kiran Divekar | e86dc1c | 2010-06-14 22:01:26 +0530 | [diff] [blame] | 116 | if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) { |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 117 | struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data; |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 118 | |
| 119 | /* set txpd fields from the radiotap header */ |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 120 | txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate)); |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 121 | |
| 122 | /* skip the radiotap header */ |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 123 | p802x_hdr += sizeof(*rtap_hdr); |
| 124 | pkt_len -= sizeof(*rtap_hdr); |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 125 | |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 126 | /* copy destination address from 802.11 header */ |
| 127 | memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN); |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 128 | } else { |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 129 | /* copy destination address from 802.3 header */ |
| 130 | memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN); |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 131 | } |
| 132 | |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 133 | txpd->tx_packet_length = cpu_to_le16(pkt_len); |
| 134 | txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd)); |
| 135 | |
Holger Schurig | e0e42da | 2009-11-25 13:10:15 +0100 | [diff] [blame] | 136 | lbs_mesh_set_txpd(priv, dev, txpd); |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 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 | |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 144 | spin_lock_irqsave(&priv->driver_lock, flags); |
David Woodhouse | 2eb188a | 2007-12-09 23:54:27 -0500 | [diff] [blame] | 145 | priv->tx_pending_len = pkt_len + sizeof(struct txpd); |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 146 | |
David Woodhouse | 2eb188a | 2007-12-09 23:54:27 -0500 | [diff] [blame] | 147 | lbs_deb_tx("%s lined up packet\n", __func__); |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 148 | |
Stephen Hemminger | bbfc6b7 | 2009-03-20 19:36:36 +0000 | [diff] [blame] | 149 | dev->stats.tx_packets++; |
| 150 | dev->stats.tx_bytes += skb->len; |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 151 | |
Kiran Divekar | e86dc1c | 2010-06-14 22:01:26 +0530 | [diff] [blame] | 152 | if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) { |
David Woodhouse | 2eb188a | 2007-12-09 23:54:27 -0500 | [diff] [blame] | 153 | /* Keep the skb to echo it back once Tx feedback is |
| 154 | received from FW */ |
| 155 | skb_orphan(skb); |
David Woodhouse | a2b62dc | 2007-12-09 14:37:59 -0500 | [diff] [blame] | 156 | |
David Woodhouse | 2eb188a | 2007-12-09 23:54:27 -0500 | [diff] [blame] | 157 | /* Keep the skb around for when we get feedback */ |
| 158 | priv->currenttxskb = skb; |
| 159 | } else { |
| 160 | free: |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 161 | dev_kfree_skb_any(skb); |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 162 | } |
Kiran Divekar | e86dc1c | 2010-06-14 22:01:26 +0530 | [diff] [blame] | 163 | |
David Woodhouse | 2eb188a | 2007-12-09 23:54:27 -0500 | [diff] [blame] | 164 | unlock: |
| 165 | spin_unlock_irqrestore(&priv->driver_lock, flags); |
| 166 | wake_up(&priv->waitq); |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 167 | |
Holger Schurig | 9012b28 | 2007-05-25 11:27:16 -0400 | [diff] [blame] | 168 | lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret); |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 169 | return ret; |
| 170 | } |
| 171 | |
| 172 | /** |
Randy Dunlap | 8973a6e | 2011-04-26 15:25:29 -0700 | [diff] [blame] | 173 | * lbs_send_tx_feedback - sends to the host the last transmitted packet, |
| 174 | * filling the radiotap headers with transmission information. |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 175 | * |
Randy Dunlap | 8973a6e | 2011-04-26 15:25:29 -0700 | [diff] [blame] | 176 | * @priv: A pointer to &struct lbs_private structure |
| 177 | * @try_count: A 32-bit value containing transmission retry status. |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 178 | * |
Randy Dunlap | 8973a6e | 2011-04-26 15:25:29 -0700 | [diff] [blame] | 179 | * returns: void |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 180 | */ |
Holger Schurig | 7919b89 | 2008-04-01 14:50:43 +0200 | [diff] [blame] | 181 | void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count) |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 182 | { |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 183 | struct tx_radiotap_hdr *radiotap_hdr; |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 184 | |
Dan Carpenter | bd75eb8 | 2010-07-22 14:21:02 +0200 | [diff] [blame] | 185 | if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR || |
Kiran Divekar | e86dc1c | 2010-06-14 22:01:26 +0530 | [diff] [blame] | 186 | priv->currenttxskb == NULL) |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 187 | return; |
| 188 | |
David Woodhouse | aa21c00 | 2007-12-08 20:04:36 +0000 | [diff] [blame] | 189 | radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data; |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 190 | |
Holger Schurig | 7919b89 | 2008-04-01 14:50:43 +0200 | [diff] [blame] | 191 | radiotap_hdr->data_retries = try_count ? |
| 192 | (1 + priv->txretrycount - try_count) : 0; |
David Woodhouse | 6f93a8e | 2007-12-10 00:49:26 -0500 | [diff] [blame] | 193 | |
| 194 | priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb, |
Kiran Divekar | e86dc1c | 2010-06-14 22:01:26 +0530 | [diff] [blame] | 195 | priv->dev); |
David Woodhouse | 6f93a8e | 2007-12-10 00:49:26 -0500 | [diff] [blame] | 196 | netif_rx(priv->currenttxskb); |
| 197 | |
David Woodhouse | aa21c00 | 2007-12-08 20:04:36 +0000 | [diff] [blame] | 198 | priv->currenttxskb = NULL; |
Brajesh Dave | 01d77d8 | 2007-11-20 17:44:14 -0500 | [diff] [blame] | 199 | |
David Woodhouse | aa21c00 | 2007-12-08 20:04:36 +0000 | [diff] [blame] | 200 | if (priv->connect_status == LBS_CONNECTED) |
Holger Schurig | 634b8f4 | 2007-05-25 13:05:16 -0400 | [diff] [blame] | 201 | netif_wake_queue(priv->dev); |
Brajesh Dave | 01d77d8 | 2007-11-20 17:44:14 -0500 | [diff] [blame] | 202 | |
Daniel Drake | d931998 | 2011-07-20 17:53:56 +0100 | [diff] [blame] | 203 | if (priv->mesh_dev && netif_running(priv->mesh_dev)) |
Brajesh Dave | 01d77d8 | 2007-11-20 17:44:14 -0500 | [diff] [blame] | 204 | netif_wake_queue(priv->mesh_dev); |
Marcelo Tosatti | 876c9d3 | 2007-02-10 12:25:27 -0200 | [diff] [blame] | 205 | } |
Holger Schurig | 1007832 | 2007-11-15 18:05:47 -0500 | [diff] [blame] | 206 | EXPORT_SYMBOL_GPL(lbs_send_tx_feedback); |