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 <net/cfg80211.h>
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)
22 * returns: Output Rate (0 if invalid)
24 static u32 convert_radiotap_rate_to_mv(u8 rate)
31 case 11: /* 5.5 Mbps */
33 case 22: /* 11 Mbps */
39 case 24: /* 12 Mbps */
41 case 36: /* 18 Mbps */
43 case 48: /* 24 Mbps */
45 case 72: /* 36 Mbps */
47 case 96: /* 48 Mbps */
49 case 108: /* 54 Mbps */
56 * lbs_hard_start_xmit - checks the conditions and sends packet to IF
57 * layer if everything is ok
59 * @skb: A pointer to skb which includes TX packet
60 * @dev: A pointer to the &struct net_device
63 netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
66 struct lbs_private *priv = dev->ml_priv;
70 netdev_tx_t ret = NETDEV_TX_OK;
72 lbs_deb_enter(LBS_DEB_TX);
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);
78 if (priv->surpriseremoved)
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' */
86 dev->stats.tx_dropped++;
87 dev->stats.tx_errors++;
92 netif_stop_queue(priv->dev);
94 netif_stop_queue(priv->mesh_dev);
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;
105 priv->tx_pending_len = -1;
106 spin_unlock_irqrestore(&priv->driver_lock, flags);
108 lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
110 txpd = (void *)priv->tx_pending_buf;
111 memset(txpd, 0, sizeof(struct txpd));
113 p802x_hdr = skb->data;
116 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
117 struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;
119 /* set txpd fields from the radiotap header */
120 txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));
122 /* skip the radiotap header */
123 p802x_hdr += sizeof(*rtap_hdr);
124 pkt_len -= sizeof(*rtap_hdr);
126 /* copy destination address from 802.11 header */
127 memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
129 /* copy destination address from 802.3 header */
130 memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
133 txpd->tx_packet_length = cpu_to_le16(pkt_len);
134 txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
136 lbs_mesh_set_txpd(priv, dev, txpd);
138 lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd));
140 lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
142 memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
144 spin_lock_irqsave(&priv->driver_lock, flags);
145 priv->tx_pending_len = pkt_len + sizeof(struct txpd);
147 lbs_deb_tx("%s lined up packet\n", __func__);
149 dev->stats.tx_packets++;
150 dev->stats.tx_bytes += skb->len;
152 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
153 /* Keep the skb to echo it back once Tx feedback is
157 /* Keep the skb around for when we get feedback */
158 priv->currenttxskb = skb;
161 dev_kfree_skb_any(skb);
165 spin_unlock_irqrestore(&priv->driver_lock, flags);
166 wake_up(&priv->waitq);
168 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
173 * lbs_send_tx_feedback - sends to the host the last transmitted packet,
174 * filling the radiotap headers with transmission information.
176 * @priv: A pointer to &struct lbs_private structure
177 * @try_count: A 32-bit value containing transmission retry status.
181 void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count)
183 struct tx_radiotap_hdr *radiotap_hdr;
185 if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR ||
186 priv->currenttxskb == NULL)
189 radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
191 radiotap_hdr->data_retries = try_count ?
192 (1 + priv->txretrycount - try_count) : 0;
194 priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb,
196 netif_rx(priv->currenttxskb);
198 priv->currenttxskb = NULL;
200 if (priv->connect_status == LBS_CONNECTED)
201 netif_wake_queue(priv->dev);
203 if (priv->mesh_dev && netif_running(priv->mesh_dev))
204 netif_wake_queue(priv->mesh_dev);
206 EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);