2 * This file contains the handling of TX in wlan driver.
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>
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)
23 * returns: Output Rate (0 if invalid)
25 static u32 convert_radiotap_rate_to_mv(u8 rate)
32 case 11: /* 5.5 Mbps */
34 case 22: /* 11 Mbps */
40 case 24: /* 12 Mbps */
42 case 36: /* 18 Mbps */
44 case 48: /* 24 Mbps */
46 case 72: /* 36 Mbps */
48 case 96: /* 48 Mbps */
50 case 108: /* 54 Mbps */
57 * lbs_hard_start_xmit - checks the conditions and sends packet to IF
58 * layer if everything is ok
60 * @skb: A pointer to skb which includes TX packet
61 * @dev: A pointer to the &struct net_device
64 netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
67 struct lbs_private *priv = dev->ml_priv;
71 netdev_tx_t ret = NETDEV_TX_OK;
73 lbs_deb_enter(LBS_DEB_TX);
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);
79 if (priv->surpriseremoved)
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' */
87 dev->stats.tx_dropped++;
88 dev->stats.tx_errors++;
93 netif_stop_queue(priv->dev);
95 netif_stop_queue(priv->mesh_dev);
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;
106 priv->tx_pending_len = -1;
107 spin_unlock_irqrestore(&priv->driver_lock, flags);
109 lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
111 txpd = (void *)priv->tx_pending_buf;
112 memset(txpd, 0, sizeof(struct txpd));
114 p802x_hdr = skb->data;
117 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
118 struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;
120 /* set txpd fields from the radiotap header */
121 txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));
123 /* skip the radiotap header */
124 p802x_hdr += sizeof(*rtap_hdr);
125 pkt_len -= sizeof(*rtap_hdr);
127 /* copy destination address from 802.11 header */
128 memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
130 /* copy destination address from 802.3 header */
131 memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
134 txpd->tx_packet_length = cpu_to_le16(pkt_len);
135 txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
137 lbs_mesh_set_txpd(priv, dev, txpd);
139 lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd));
141 lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
143 memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
145 spin_lock_irqsave(&priv->driver_lock, flags);
146 priv->tx_pending_len = pkt_len + sizeof(struct txpd);
148 lbs_deb_tx("%s lined up packet\n", __func__);
150 dev->stats.tx_packets++;
151 dev->stats.tx_bytes += skb->len;
153 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
154 /* Keep the skb to echo it back once Tx feedback is
158 /* Keep the skb around for when we get feedback */
159 priv->currenttxskb = skb;
162 dev_kfree_skb_any(skb);
166 spin_unlock_irqrestore(&priv->driver_lock, flags);
167 wake_up(&priv->waitq);
169 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
174 * lbs_send_tx_feedback - sends to the host the last transmitted packet,
175 * filling the radiotap headers with transmission information.
177 * @priv: A pointer to &struct lbs_private structure
178 * @try_count: A 32-bit value containing transmission retry status.
182 void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count)
184 struct tx_radiotap_hdr *radiotap_hdr;
186 if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR ||
187 priv->currenttxskb == NULL)
190 radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
192 radiotap_hdr->data_retries = try_count ?
193 (1 + priv->txretrycount - try_count) : 0;
195 priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb,
197 netif_rx(priv->currenttxskb);
199 priv->currenttxskb = NULL;
201 if (priv->connect_status == LBS_CONNECTED)
202 netif_wake_queue(priv->dev);
204 if (priv->mesh_dev && netif_running(priv->mesh_dev))
205 netif_wake_queue(priv->mesh_dev);
207 EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);