kernel-ark/drivers/net/wireless/libertas/tx.c
Holger Schurig fcff0e0856 [PATCH] libertas: remove adapter->pkttxctrl
The variable was initialized to 0 and nowhere else changed, so basically
the per-packet TX control wasn't used.

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2007-10-10 16:49:59 -07:00

283 lines
7.2 KiB
C

/**
* 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 processes a single packet and sends
* to IF layer
*
* @param priv A pointer to wlan_private structure
* @param skb A pointer to skb which includes TX packet
* @return 0 or -1
*/
static int SendSinglePacket(wlan_private * priv, struct sk_buff *skb)
{
int ret = 0;
struct txpd localtxpd;
struct txpd *plocaltxpd = &localtxpd;
u8 *p802x_hdr;
struct tx_radiotap_hdr *pradiotap_hdr;
u32 new_rate;
u8 *ptr = priv->adapter->tmptxbuf;
lbs_deb_enter(LBS_DEB_TX);
if (priv->adapter->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);
ret = -1;
goto done;
}
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->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {
/* 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->adapter->linkmode == WLAN_LINKMODE_802_11)
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->adapter->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;
}
lbs_deb_tx("SendSinglePacket succeeds\n");
done:
if (!ret) {
priv->stats.tx_packets++;
priv->stats.tx_bytes += skb->len;
} else {
priv->stats.tx_dropped++;
priv->stats.tx_errors++;
}
if (!ret && priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {
/* 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);
/* freeze any packets already in our queues */
priv->adapter->TxLockFlag = 1;
} else {
dev_kfree_skb_any(skb);
priv->adapter->currenttxskb = NULL;
}
lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
return ret;
}
void libertas_tx_runqueue(wlan_private *priv)
{
wlan_adapter *adapter = priv->adapter;
int i;
spin_lock(&adapter->txqueue_lock);
for (i = 0; i < adapter->tx_queue_idx; i++) {
struct sk_buff *skb = adapter->tx_queue_ps[i];
spin_unlock(&adapter->txqueue_lock);
SendSinglePacket(priv, skb);
spin_lock(&adapter->txqueue_lock);
}
adapter->tx_queue_idx = 0;
spin_unlock(&adapter->txqueue_lock);
}
static void wlan_tx_queue(wlan_private *priv, struct sk_buff *skb)
{
wlan_adapter *adapter = priv->adapter;
spin_lock(&adapter->txqueue_lock);
WARN_ON(priv->adapter->tx_queue_idx >= NR_TX_QUEUE);
adapter->tx_queue_ps[adapter->tx_queue_idx++] = skb;
if (adapter->tx_queue_idx == NR_TX_QUEUE) {
netif_stop_queue(priv->dev);
if (priv->mesh_dev)
netif_stop_queue(priv->mesh_dev);
} else {
netif_start_queue(priv->dev);
if (priv->mesh_dev)
netif_start_queue(priv->mesh_dev);
}
spin_unlock(&adapter->txqueue_lock);
}
/**
* @brief This function checks the conditions and sends packet to IF
* layer if everything is ok.
*
* @param priv A pointer to wlan_private structure
* @return n/a
*/
int libertas_process_tx(wlan_private * priv, struct sk_buff *skb)
{
int ret = -1;
lbs_deb_enter(LBS_DEB_TX);
lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
if (priv->dnld_sent) {
lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n",
priv->dnld_sent);
goto done;
}
if ((priv->adapter->psstate == PS_STATE_SLEEP) ||
(priv->adapter->psstate == PS_STATE_PRE_SLEEP)) {
wlan_tx_queue(priv, skb);
return ret;
}
priv->adapter->currenttxskb = skb;
ret = SendSinglePacket(priv, 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 wlan_private structure
* @param status A 32 bit value containing transmission status.
*
* @returns void
*/
void libertas_send_tx_feedback(wlan_private * priv)
{
wlan_adapter *adapter = priv->adapter;
struct tx_radiotap_hdr *radiotap_hdr;
u32 status = adapter->eventcause;
int txfail;
int try_count;
if (adapter->radiomode != WLAN_RADIOMODE_RADIOTAP ||
adapter->currenttxskb == NULL)
return;
radiotap_hdr = (struct tx_radiotap_hdr *)adapter->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 + adapter->txretrycount - try_count) : 0;
libertas_upload_rx_packet(priv, adapter->currenttxskb);
adapter->currenttxskb = NULL;
priv->adapter->TxLockFlag = 0;
if (priv->adapter->connect_status == LIBERTAS_CONNECTED) {
netif_wake_queue(priv->dev);
if (priv->mesh_dev)
netif_wake_queue(priv->mesh_dev);
}
}
EXPORT_SYMBOL_GPL(libertas_send_tx_feedback);