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/**
* This file contains the handling of TX in wlan driver.
*/
#include <linux/netdevice.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)
{
struct lbs_private *priv = dev->priv;
int ret = -1;
struct txpd localtxpd;
struct txpd *plocaltxpd = &localtxpd;
u8 *p802x_hdr;
struct tx_radiotap_hdr *pradiotap_hdr;
u32 new_rate;
u8 *ptr = priv->tmptxbuf;
lbs_deb_enter(LBS_DEB_TX);
lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
netif_stop_queue(priv->dev);
if (priv->mesh_dev)
netif_stop_queue(priv->mesh_dev);
if (priv->dnld_sent) {
lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n",
priv->dnld_sent);
goto done;
}
if (priv->currenttxskb) {
lbs_pr_err("%s while TX skb pending\n", __func__);
goto done;
}
if ((priv->psstate == PS_STATE_SLEEP) ||
(priv->psstate == PS_STATE_PRE_SLEEP)) {
lbs_pr_alert("TX error: packet xmit in %ssleep mode\n",
priv->psstate == PS_STATE_SLEEP?"":"pre-");
goto done;
}
if (priv->surpriseremoved)
return -1;
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);
goto done_tx;
}
ret = 0;
memset(plocaltxpd, 0, sizeof(struct txpd));
plocaltxpd->tx_packet_length = cpu_to_le16(skb->len);
/* offset of actual data */
plocaltxpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
p802x_hdr = skb->data;
if (priv->monitormode != LBS_MONITOR_OFF) {
/* locate radiotap header */
pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data;
/* set txpd fields from the radiotap header */
new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate);
if (new_rate != 0) {
/* use new tx_control[4:0] */
plocaltxpd->tx_control = cpu_to_le32(new_rate);
}
/* skip the radiotap header */
p802x_hdr += sizeof(struct tx_radiotap_hdr);
plocaltxpd->tx_packet_length =
cpu_to_le16(le16_to_cpu(plocaltxpd->tx_packet_length)
- sizeof(struct tx_radiotap_hdr));
}
/* copy destination address from 802.3 or 802.11 header */
if (priv->monitormode != LBS_MONITOR_OFF)
memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
else
memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) plocaltxpd, sizeof(struct txpd));
if (IS_MESH_FRAME(skb)) {
plocaltxpd->tx_control |= cpu_to_le32(TxPD_MESH_FRAME);
}
memcpy(ptr, plocaltxpd, sizeof(struct txpd));
ptr += sizeof(struct txpd);
lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(plocaltxpd->tx_packet_length));
memcpy(ptr, p802x_hdr, le16_to_cpu(plocaltxpd->tx_packet_length));
ret = priv->hw_host_to_card(priv, MVMS_DAT,
priv->tmptxbuf,
le16_to_cpu(plocaltxpd->tx_packet_length) +
sizeof(struct txpd));
if (ret) {
lbs_deb_tx("tx err: hw_host_to_card returned 0x%X\n", ret);
goto done_tx;
}
lbs_deb_tx("%s succeeds\n", __func__);
done_tx:
if (!ret) {
priv->stats.tx_packets++;
priv->stats.tx_bytes += skb->len;
dev->trans_start = jiffies;
} else {
priv->stats.tx_dropped++;
priv->stats.tx_errors++;
}
if (!ret && priv->monitormode != LBS_MONITOR_OFF) {
/* Keep the skb to echo it back once Tx feedback is
received from FW */
skb_orphan(skb);
/* stop processing outgoing pkts */
netif_stop_queue(priv->dev);
if (priv->mesh_dev)
netif_stop_queue(priv->mesh_dev);
/* Keep the skb around for when we get feedback */
priv->currenttxskb = skb;
} else {
dev_kfree_skb_any(skb);
}
done:
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;
lbs_upload_rx_packet(priv, 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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