--- /dev/null
+/**
+ * This file contains the handling of TX in wlan driver.
+ */
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+
+#include "hostcmd.h"
+#include "radiotap.h"
+#include "decl.h"
+#include "defs.h"
+#include "dev.h"
+#include "wext.h"
+
+/**
+ * @brief This function converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
+ * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
+ *
+ * @param rate Input rate
+ * @return Output Rate (0 if invalid)
+ */
+static u32 convert_radiotap_rate_to_mv(u8 rate)
+{
+ switch (rate) {
+ case 2: /* 1 Mbps */
+ return 0 | (1 << 4);
+ case 4: /* 2 Mbps */
+ return 1 | (1 << 4);
+ case 11: /* 5.5 Mbps */
+ return 2 | (1 << 4);
+ case 22: /* 11 Mbps */
+ return 3 | (1 << 4);
+ case 12: /* 6 Mbps */
+ return 4 | (1 << 4);
+ case 18: /* 9 Mbps */
+ return 5 | (1 << 4);
+ case 24: /* 12 Mbps */
+ return 6 | (1 << 4);
+ case 36: /* 18 Mbps */
+ return 7 | (1 << 4);
+ case 48: /* 24 Mbps */
+ return 8 | (1 << 4);
+ case 72: /* 36 Mbps */
+ return 9 | (1 << 4);
+ case 96: /* 48 Mbps */
+ return 10 | (1 << 4);
+ case 108: /* 54 Mbps */
+ return 11 | (1 << 4);
+ }
+ return 0;
+}
+
+/**
+ * @brief This function checks the conditions and sends packet to IF
+ * layer if everything is ok.
+ *
+ * @param priv A pointer to struct lbs_private structure
+ * @param skb A pointer to skb which includes TX packet
+ * @return 0 or -1
+ */
+int lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ unsigned long flags;
+ struct lbs_private *priv = dev->priv;
+ struct txpd *txpd;
+ char *p802x_hdr;
+ uint16_t pkt_len;
+ int ret;
+
+ lbs_deb_enter(LBS_DEB_TX);
+
+ ret = NETDEV_TX_OK;
+
+ /* We need to protect against the queues being restarted before
+ we get round to stopping them */
+ spin_lock_irqsave(&priv->driver_lock, flags);
+
+ if (priv->surpriseremoved)
+ goto free;
+
+ if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
+ lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
+ skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
+ /* We'll never manage to send this one; drop it and return 'OK' */
+
+ priv->stats.tx_dropped++;
+ priv->stats.tx_errors++;
+ goto free;
+ }
+
+
+ netif_stop_queue(priv->dev);
+ if (priv->mesh_dev)
+ netif_stop_queue(priv->mesh_dev);
+
+ if (priv->tx_pending_len) {
+ /* This can happen if packets come in on the mesh and eth
+ device simultaneously -- there's no mutual exclusion on
+ hard_start_xmit() calls between devices. */
+ lbs_deb_tx("Packet on %s while busy\n", dev->name);
+ ret = NETDEV_TX_BUSY;
+ goto unlock;
+ }
+
+ priv->tx_pending_len = -1;
+ spin_unlock_irqrestore(&priv->driver_lock, flags);
+
+ lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
+
+ txpd = (void *)priv->tx_pending_buf;
+ memset(txpd, 0, sizeof(struct txpd));
+
+ p802x_hdr = skb->data;
+ pkt_len = skb->len;
+
+ if (dev == priv->rtap_net_dev) {
+ struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;
+
+ /* set txpd fields from the radiotap header */
+ txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));
+
+ /* skip the radiotap header */
+ p802x_hdr += sizeof(*rtap_hdr);
+ pkt_len -= sizeof(*rtap_hdr);
+
+ /* copy destination address from 802.11 header */
+ memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
+ } else {
+ /* copy destination address from 802.3 header */
+ memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
+ }
+
+ txpd->tx_packet_length = cpu_to_le16(pkt_len);
+ txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
+
+ if (dev == priv->mesh_dev)
+ txpd->tx_control |= cpu_to_le32(TxPD_MESH_FRAME);
+
+ lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd));
+
+ lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
+
+ memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
+
+ spin_lock_irqsave(&priv->driver_lock, flags);
+ priv->tx_pending_len = pkt_len + sizeof(struct txpd);
+
+ lbs_deb_tx("%s lined up packet\n", __func__);
+
+ priv->stats.tx_packets++;
+ priv->stats.tx_bytes += skb->len;
+
+ dev->trans_start = jiffies;
+
+ if (priv->monitormode != LBS_MONITOR_OFF) {
+ /* Keep the skb to echo it back once Tx feedback is
+ received from FW */
+ skb_orphan(skb);
+
+ /* Keep the skb around for when we get feedback */
+ priv->currenttxskb = skb;
+ } else {
+ free:
+ dev_kfree_skb_any(skb);
+ }
+ unlock:
+ spin_unlock_irqrestore(&priv->driver_lock, flags);
+ wake_up(&priv->waitq);
+
+ lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
+ return ret;
+}
+
+/**
+ * @brief This function sends to the host the last transmitted packet,
+ * filling the radiotap headers with transmission information.
+ *
+ * @param priv A pointer to struct lbs_private structure
+ * @param status A 32 bit value containing transmission status.
+ *
+ * @returns void
+ */
+void lbs_send_tx_feedback(struct lbs_private *priv)
+{
+ struct tx_radiotap_hdr *radiotap_hdr;
+ u32 status = priv->eventcause;
+ int txfail;
+ int try_count;
+
+ if (priv->monitormode == LBS_MONITOR_OFF ||
+ priv->currenttxskb == NULL)
+ return;
+
+ radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
+
+ txfail = (status >> 24);
+
+#if 0
+ /* The version of roofnet that we've tested does not use this yet
+ * But it may be used in the future.
+ */
+ if (txfail)
+ radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL;
+#endif
+ try_count = (status >> 16) & 0xff;
+ radiotap_hdr->data_retries = (try_count) ?
+ (1 + priv->txretrycount - try_count) : 0;
+
+
+ priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb,
+ priv->rtap_net_dev);
+ netif_rx(priv->currenttxskb);
+
+ priv->currenttxskb = NULL;
+
+ if (priv->connect_status == LBS_CONNECTED)
+ netif_wake_queue(priv->dev);
+
+ if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED))
+ netif_wake_queue(priv->mesh_dev);
+}
+EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);
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