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libertas: Move actual transmission to main thread 

The locking issues with TX, especially TX from multiple netdevs, get
_so_ much easier if you do it like this.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
David Woodhouse 2007-12-09 23:54:27 -05:00 committed by David S. Miller
parent b8d40bc9c9
commit 2eb188a1c5
3 changed files with 71 additions and 61 deletions
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5
drivers/net/wireless/libertas/dev.h
View File

@ -164,7 +164,10 @@ struct lbs_private {
struct mutex lock;
u8 tmptxbuf[LBS_UPLD_SIZE];
/* TX packet ready to be sent... */
int tx_pending_len; /* -1 while building packet */
u8 tx_pending_buf[LBS_UPLD_SIZE];
/* protected by hard_start_xmit serialization */
/** command-related variables */

24
drivers/net/wireless/libertas/main.c
View File

@ -739,6 +739,8 @@ static int lbs_thread(void *data)
shouldsleep = 0; /* Interrupt pending. Deal with it now */
else if (priv->dnld_sent)
shouldsleep = 1; /* Something is en route to the device already */
else if (priv->tx_pending_len > 0)
shouldsleep = 0; /* We've a packet to send */
else if (priv->cur_cmd)
shouldsleep = 1; /* Can't send a command; one already running */
else if (!list_empty(&priv->cmdpendingq))
@ -852,6 +854,28 @@ static int lbs_thread(void *data)
*/
if (!list_empty(&priv->cmdpendingq))
wake_up_all(&priv->cmd_pending);
spin_lock_irq(&priv->driver_lock);
if (!priv->dnld_sent && priv->tx_pending_len > 0) {
int ret = priv->hw_host_to_card(priv, MVMS_DAT,
priv->tx_pending_buf,
priv->tx_pending_len);
if (ret) {
lbs_deb_tx("host_to_card failed %d\n", ret);
priv->dnld_sent = DNLD_RES_RECEIVED;
}
priv->tx_pending_len = 0;
if (!priv->currenttxskb) {
/* We can wake the queues immediately if we aren't
waiting for TX feedback */
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);
}
}
spin_unlock_irq(&priv->driver_lock);
}
del_timer(&priv->command_timer);

103
drivers/net/wireless/libertas/tx.c
View File

@ -67,39 +67,45 @@ int lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
lbs_deb_enter(LBS_DEB_TX);
ret = NETDEV_TX_BUSY;
ret = NETDEV_TX_OK;
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;
}
/* 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 drop;
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' */
goto drop;
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->tmptxbuf;
txpd = (void *)priv->tx_pending_buf;
memset(txpd, 0, sizeof(struct txpd));
p802x_hdr = skb->data;
@ -134,54 +140,31 @@ int lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
/* We need to protect against the queues being restarted before
we get round to stopping them */
spin_lock_irqsave(&priv->driver_lock, flags);
priv->tx_pending_len = pkt_len + sizeof(struct txpd);
ret = priv->hw_host_to_card(priv, MVMS_DAT, priv->tmptxbuf,
pkt_len + sizeof(struct txpd));
lbs_deb_tx("%s lined up packet\n", __func__);
if (!ret) {
lbs_deb_tx("%s succeeds\n", __func__);
priv->stats.tx_packets++;
priv->stats.tx_bytes += skb->len;
/* Stop processing outgoing pkts before submitting */
netif_stop_queue(priv->dev);
if (priv->mesh_dev)
netif_stop_queue(priv->mesh_dev);
dev->trans_start = jiffies;
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
dev_kfree_skb_any(skb);
}
spin_unlock_irqrestore(&priv->driver_lock, flags);
if (ret) {
lbs_deb_tx("tx err: hw_host_to_card returned 0x%X\n", ret);
drop:
priv->stats.tx_dropped++;
priv->stats.tx_errors++;
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);
/* Even if we dropped the packet, return OK. Otherwise the
packet gets requeued. */
ret = NETDEV_TX_OK;
done:
lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
return ret;
}