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/**
* This file contains the handling of TX in wlan driver.
*/
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/sched.h>
#include <net/cfg80211.h>
#include "host.h"
#include "radiotap.h"
#include "decl.h"
#include "defs.h"
#include "dev.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
*/
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;
}
/**
* @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, 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 && lbs_mesh_connected(priv))
netif_wake_queue(priv->mesh_dev);
}
EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);
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