2 * This file contains the handling of TX in wlan driver.
4 #include <linux/netdevice.h>
5 #include <linux/etherdevice.h>
15 * @brief This function converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
16 * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
18 * @param rate Input rate
19 * @return Output Rate (0 if invalid)
21 static u32 convert_radiotap_rate_to_mv(u8 rate)
28 case 11: /* 5.5 Mbps */
30 case 22: /* 11 Mbps */
36 case 24: /* 12 Mbps */
38 case 36: /* 18 Mbps */
40 case 48: /* 24 Mbps */
42 case 72: /* 36 Mbps */
44 case 96: /* 48 Mbps */
46 case 108: /* 54 Mbps */
53 * @brief This function checks the conditions and sends packet to IF
54 * layer if everything is ok.
56 * @param priv A pointer to struct lbs_private structure
57 * @param skb A pointer to skb which includes TX packet
60 int lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
63 struct lbs_private *priv = dev->priv;
69 lbs_deb_enter(LBS_DEB_TX);
73 /* We need to protect against the queues being restarted before
74 we get round to stopping them */
75 spin_lock_irqsave(&priv->driver_lock, flags);
77 if (priv->surpriseremoved)
80 if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
81 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
82 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
83 /* We'll never manage to send this one; drop it and return 'OK' */
85 priv->stats.tx_dropped++;
86 priv->stats.tx_errors++;
91 netif_stop_queue(priv->dev);
93 netif_stop_queue(priv->mesh_dev);
95 if (priv->tx_pending_len) {
96 /* This can happen if packets come in on the mesh and eth
97 device simultaneously -- there's no mutual exclusion on
98 hard_start_xmit() calls between devices. */
99 lbs_deb_tx("Packet on %s while busy\n", dev->name);
100 ret = NETDEV_TX_BUSY;
104 priv->tx_pending_len = -1;
105 spin_unlock_irqrestore(&priv->driver_lock, flags);
107 lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
109 txpd = (void *)priv->tx_pending_buf;
110 memset(txpd, 0, sizeof(struct txpd));
112 p802x_hdr = skb->data;
115 if (dev == priv->rtap_net_dev) {
116 struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;
118 /* set txpd fields from the radiotap header */
119 txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));
121 /* skip the radiotap header */
122 p802x_hdr += sizeof(*rtap_hdr);
123 pkt_len -= sizeof(*rtap_hdr);
125 /* copy destination address from 802.11 header */
126 memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
128 /* copy destination address from 802.3 header */
129 memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
132 txpd->tx_packet_length = cpu_to_le16(pkt_len);
133 txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
135 if (dev == priv->mesh_dev)
136 txpd->tx_control |= cpu_to_le32(TxPD_MESH_FRAME);
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 priv->stats.tx_packets++;
150 priv->stats.tx_bytes += skb->len;
152 dev->trans_start = jiffies;
154 if (priv->monitormode) {
155 /* Keep the skb to echo it back once Tx feedback is
159 /* Keep the skb around for when we get feedback */
160 priv->currenttxskb = skb;
163 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 * @brief This function sends to the host the last transmitted packet,
175 * filling the radiotap headers with transmission information.
177 * @param priv A pointer to struct lbs_private structure
178 * @param status A 32 bit value containing transmission status.
182 void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count)
184 struct tx_radiotap_hdr *radiotap_hdr;
186 if (!priv->monitormode || 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 && (priv->mesh_connect_status == LBS_CONNECTED))
204 netif_wake_queue(priv->mesh_dev);
206 EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);