2 * This file contains the handling of TX in wlan driver.
4 #include <linux/netdevice.h>
14 * @brief This function converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
15 * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
17 * @param rate Input rate
18 * @return Output Rate (0 if invalid)
20 static u32 convert_radiotap_rate_to_mv(u8 rate)
27 case 11: /* 5.5 Mbps */
29 case 22: /* 11 Mbps */
35 case 24: /* 12 Mbps */
37 case 36: /* 18 Mbps */
39 case 48: /* 24 Mbps */
41 case 72: /* 36 Mbps */
43 case 96: /* 48 Mbps */
45 case 108: /* 54 Mbps */
52 * @brief This function checks the conditions and sends packet to IF
53 * layer if everything is ok.
55 * @param priv A pointer to struct lbs_private structure
56 * @param skb A pointer to skb which includes TX packet
59 int lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
62 struct lbs_private *priv = dev->priv;
68 lbs_deb_enter(LBS_DEB_TX);
72 /* We need to protect against the queues being restarted before
73 we get round to stopping them */
74 spin_lock_irqsave(&priv->driver_lock, flags);
76 if (priv->surpriseremoved)
79 if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
80 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
81 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
82 /* We'll never manage to send this one; drop it and return 'OK' */
84 priv->stats.tx_dropped++;
85 priv->stats.tx_errors++;
90 netif_stop_queue(priv->dev);
92 netif_stop_queue(priv->mesh_dev);
94 if (priv->tx_pending_len) {
95 /* This can happen if packets come in on the mesh and eth
96 device simultaneously -- there's no mutual exclusion on
97 hard_start_xmit() calls between devices. */
98 lbs_deb_tx("Packet on %s while busy\n", dev->name);
103 priv->tx_pending_len = -1;
104 spin_unlock_irqrestore(&priv->driver_lock, flags);
106 lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
108 txpd = (void *)priv->tx_pending_buf;
109 memset(txpd, 0, sizeof(struct txpd));
111 p802x_hdr = skb->data;
114 if (dev == priv->rtap_net_dev) {
115 struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;
117 /* set txpd fields from the radiotap header */
118 txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));
120 /* skip the radiotap header */
121 p802x_hdr += sizeof(*rtap_hdr);
122 pkt_len -= sizeof(*rtap_hdr);
124 /* copy destination address from 802.11 header */
125 memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
127 /* copy destination address from 802.3 header */
128 memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
131 txpd->tx_packet_length = cpu_to_le16(pkt_len);
132 txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
134 if (dev == priv->mesh_dev)
135 txpd->tx_control |= cpu_to_le32(TxPD_MESH_FRAME);
137 lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd));
139 lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
141 memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
143 spin_lock_irqsave(&priv->driver_lock, flags);
144 priv->tx_pending_len = pkt_len + sizeof(struct txpd);
146 lbs_deb_tx("%s lined up packet\n", __func__);
148 priv->stats.tx_packets++;
149 priv->stats.tx_bytes += skb->len;
151 dev->trans_start = jiffies;
153 if (priv->monitormode != LBS_MONITOR_OFF) {
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);
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 * @brief This function sends to the host the last transmitted packet,
174 * filling the radiotap headers with transmission information.
176 * @param priv A pointer to struct lbs_private structure
177 * @param status A 32 bit value containing transmission status.
181 void lbs_send_tx_feedback(struct lbs_private *priv)
183 struct tx_radiotap_hdr *radiotap_hdr;
184 u32 status = priv->eventcause;
188 if (priv->monitormode == LBS_MONITOR_OFF ||
189 priv->currenttxskb == NULL)
192 radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
194 txfail = (status >> 24);
197 /* The version of roofnet that we've tested does not use this yet
198 * But it may be used in the future.
201 radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL;
203 try_count = (status >> 16) & 0xff;
204 radiotap_hdr->data_retries = (try_count) ?
205 (1 + priv->txretrycount - try_count) : 0;
206 lbs_upload_rx_packet(priv, priv->currenttxskb);
207 priv->currenttxskb = NULL;
209 if (priv->connect_status == LBS_CONNECTED)
210 netif_wake_queue(priv->dev);
212 if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED))
213 netif_wake_queue(priv->mesh_dev);
215 EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);