fishHEADmaster

1 files changed, 207 insertions, 0 deletions

diff --git a/drivers/net/wireless/libertas/tx.c b/drivers/net/wireless/libertas/tx.c
new file mode 100644
index 0000000..c025f9c
--- /dev/null
+++ b/drivers/net/wireless/libertas/tx.c
@@ -0,0 +1,207 @@
+/*
+ * This file contains the handling of TX in wlan driver.
+ */
+#include <linux/hardirq.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/sched.h>
+#include <linux/export.h>
+#include <net/cfg80211.h>
+
+#include "host.h"
+#include "radiotap.h"
+#include "decl.h"
+#include "defs.h"
+#include "dev.h"
+#include "mesh.h"
+
+/**
+ * convert_radiotap_rate_to_mv - converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
+ * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
+ *
+ * @rate:	Input rate
+ * returns:	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;
+}
+
+/**
+ * lbs_hard_start_xmit - checks the conditions and sends packet to IF
+ * layer if everything is ok
+ *
+ * @skb:	A pointer to skb which includes TX packet
+ * @dev:	A pointer to the &struct net_device
+ * returns:	0 or -1
+ */
+netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	unsigned long flags;
+	struct lbs_private *priv = dev->ml_priv;
+	struct txpd *txpd;
+	char *p802x_hdr;
+	uint16_t pkt_len;
+	netdev_tx_t ret = NETDEV_TX_OK;
+
+	lbs_deb_enter(LBS_DEB_TX);
+
+	/* 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' */
+
+		dev->stats.tx_dropped++;
+		dev->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 (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
+		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));
+
+	lbs_mesh_set_txpd(priv, dev, txpd);
+
+	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__);
+
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += skb->len;
+
+	if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
+		/* 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;
+}
+
+/**
+ * lbs_send_tx_feedback - sends to the host the last transmitted packet,
+ * filling the radiotap headers with transmission information.
+ *
+ * @priv:	A pointer to &struct lbs_private structure
+ * @try_count:	A 32-bit value containing transmission retry status.
+ *
+ * returns:	void
+ */
+void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count)
+{
+	struct tx_radiotap_hdr *radiotap_hdr;
+
+	if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR ||
+	    priv->currenttxskb == NULL)
+		return;
+
+	radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
+
+	radiotap_hdr->data_retries = try_count ?
+		(1 + priv->txretrycount - try_count) : 0;
+
+	priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb,
+						      priv->dev);
+	netif_rx(priv->currenttxskb);
+
+	priv->currenttxskb = NULL;
+
+	if (priv->connect_status == LBS_CONNECTED)
+		netif_wake_queue(priv->dev);
+
+	if (priv->mesh_dev && netif_running(priv->mesh_dev))
+		netif_wake_queue(priv->mesh_dev);
+}
+EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);