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Date: Wed, 28 Nov 2007 17:51:24 +0000
From: "Bahadir Balban" <bahadir.balban@...il.com>
To: netdev@...r.kernel.org
Subject: smsc911x changes for new NAPI
Hi,
I have made the following changes to our off-tree 2.6.22 smsc911x
driver, to make it run on 2.6.24-rc2. However the NAPI poll function
does not get called after an rx irq. Can you comment on what's wrong?
Thanks,
Bahadir
diff --git a/drivers/net/smsc911x.c b/drivers/net/smsc911x.c
index b7fe2f3..e5c6c4a 100644
--- a/drivers/net/smsc911x.c
+++ b/drivers/net/smsc911x.c
@@ -98,7 +98,6 @@ struct smsc911x_data {
spinlock_t phy_lock;
spinlock_t dev_lock;
- struct net_device_stats stats;
struct mii_if_info mii;
unsigned int using_extphy;
u32 msg_enable;
@@ -106,6 +105,8 @@ struct smsc911x_data {
unsigned int gpio_setting;
unsigned int gpio_orig_setting;
#endif
+ struct net_device *netdev;
+ struct napi_struct napi;
struct timer_list link_poll_timer;
unsigned int stop_link_poll;
@@ -903,6 +904,7 @@ static unsigned int
smsc911x_tx_get_txstatcount(struct smsc911x_data *pdata)
/* Reads tx statuses and increments counters where necessary */
static void smsc911x_tx_update_txcounters(struct smsc911x_data *pdata)
{
+ struct net_device *netdev = pdata->netdev;
unsigned int tx_stat;
while ((tx_stat = smsc911x_tx_get_txstatus(pdata)) != 0) {
@@ -917,24 +919,24 @@ static void smsc911x_tx_update_txcounters(struct
smsc911x_data *pdata)
SMSC_WARNING("Packet tag reserved bit is high");
} else {
if (unlikely(tx_stat & 0x00008000)) {
- pdata->stats.tx_errors++;
+ netdev->stats.tx_errors++;
} else {
- pdata->stats.tx_packets++;
- pdata->stats.tx_bytes += (tx_stat >> 16);
+ netdev->stats.tx_packets++;
+ netdev->stats.tx_bytes += (tx_stat >> 16);
}
if (unlikely(tx_stat & 0x00000100)) {
- pdata->stats.collisions += 16;
- pdata->stats.tx_aborted_errors += 1;
+ netdev->stats.collisions += 16;
+ netdev->stats.tx_aborted_errors += 1;
} else {
- pdata->stats.collisions +=
+ netdev->stats.collisions +=
((tx_stat >> 3) & 0xF);
}
if (unlikely(tx_stat & 0x00000800)) {
- pdata->stats.tx_carrier_errors += 1;
+ netdev->stats.tx_carrier_errors += 1;
}
if (unlikely(tx_stat & 0x00000200)) {
- pdata->stats.collisions++;
- pdata->stats.tx_aborted_errors++;
+ netdev->stats.collisions++;
+ netdev->stats.tx_aborted_errors++;
}
}
}
@@ -944,12 +946,13 @@ static void smsc911x_tx_update_txcounters(struct
smsc911x_data *pdata)
static void
smsc911x_rx_counterrors(struct smsc911x_data *pdata, unsigned int rxstat)
{
+ struct net_device *netdev = pdata->netdev;
int crc_err = 0;
if (unlikely(rxstat & 0x00008000)) {
- pdata->stats.rx_errors++;
+ netdev->stats.rx_errors++;
if (unlikely(rxstat & 0x00000002)) {
- pdata->stats.rx_crc_errors++;
+ netdev->stats.rx_crc_errors++;
crc_err = 1;
}
}
@@ -957,10 +960,10 @@ smsc911x_rx_counterrors(struct smsc911x_data
*pdata, unsigned int rxstat)
if (unlikely((rxstat & 0x00001020) == 0x00001020)) {
/* Frame type indicates length,
* and length error is set */
- pdata->stats.rx_length_errors++;
+ netdev->stats.rx_length_errors++;
}
if (rxstat & RX_STS_MCAST_)
- pdata->stats.multicast++;
+ netdev->stats.multicast++;
}
}
@@ -990,13 +993,13 @@ smsc911x_rx_fastforward(struct smsc911x_data
*pdata, unsigned int pktbytes)
}
/* NAPI poll function */
-static int smsc911x_poll(struct net_device *dev, int *budget)
+static int smsc911x_poll(struct napi_struct *napi, int budget)
{
- struct smsc911x_data *pdata = netdev_priv(dev);
+ struct smsc911x_data *pdata = container_of(napi, struct smsc911x_data, napi);
+ struct net_device *dev = pdata->netdev;
int npackets = 0;
- int quota = min(dev->quota, *budget);
- while (npackets < quota) {
+ while (npackets < budget) {
unsigned int pktlength;
unsigned int pktwords;
unsigned int rxstat = smsc911x_rx_get_rxstatus(pdata);
@@ -1027,15 +1030,15 @@ static int smsc911x_poll(struct net_device
*dev, int *budget)
netif_receive_skb(skb);
/* Update counters */
- pdata->stats.rx_packets++;
- pdata->stats.rx_bytes += (pktlength - 4);
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += (pktlength - 4);
dev->last_rx = jiffies;
npackets++;
continue;
} else {
SMSC_WARNING("Unable to allocate sk_buff "
"for rx packet, in PIO path");
- pdata->stats.rx_dropped++;
+ dev->stats.rx_dropped++;
}
}
/* At this point, the packet is to be read out
@@ -1043,25 +1046,21 @@ static int smsc911x_poll(struct net_device
*dev, int *budget)
smsc911x_rx_fastforward(pdata, pktlength);
}
- pdata->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
+ dev->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
smsc911x_reg_write(INT_STS_RSFL_, pdata, INT_STS);
- *budget -= npackets;
- dev->quota -= npackets;
-
- if (npackets < quota) {
+ if (npackets < budget) {
unsigned int temp;
/* We processed all packets available. Tell NAPI it can
* stop polling then re-enable rx interrupts */
- netif_rx_complete(dev);
+ netif_rx_complete(dev, napi);
temp = smsc911x_reg_read(pdata, INT_EN);
temp |= INT_EN_RSFL_EN_;
smsc911x_reg_write(temp, pdata, INT_EN);
- return 0;
}
- /* There are still packets waiting */
- return 1;
+ /* Return total received packets */
+ return npackets;
}
/* Returns hash bit number for given MAC address
@@ -1294,6 +1293,7 @@ static int smsc911x_open(struct net_device *dev)
smsc911x_reg_write(TX_CFG_TX_ON_, pdata, TX_CFG);
netif_start_queue(dev);
+ napi_enable(&pdata->napi);
return 0;
}
@@ -1302,6 +1302,8 @@ static int smsc911x_stop(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
+ napi_disable(&pdata->napi);
+
pdata->stop_link_poll = 1;
del_timer_sync(&pdata->link_poll_timer);
@@ -1310,7 +1312,7 @@ static int smsc911x_stop(struct net_device *dev)
netif_stop_queue(dev);
/* At this point all Rx and Tx activity is stopped */
- pdata->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
+ dev->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
smsc911x_tx_update_txcounters(pdata);
SMSC_TRACE("Interface stopped");
@@ -1374,8 +1376,8 @@ static struct net_device_stats
*smsc911x_get_stats(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
smsc911x_tx_update_txcounters(pdata);
- pdata->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
- return &pdata->stats;
+ dev->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
+ return &dev->stats;
}
/* Entry point for setting addressing modes */
@@ -1520,7 +1522,8 @@ static irqreturn_t smsc911x_irqhandler(int irq,
void *dev_id)
temp = smsc911x_reg_read(pdata, INT_EN);
temp &= (~INT_EN_RSFL_EN_);
smsc911x_reg_write(temp, pdata, INT_EN);
- netif_rx_schedule(dev);
+ /* TODO: Can call netif_rx_schedule_prep here first */
+ netif_rx_schedule(dev, &pdata->napi);
serviced = IRQ_HANDLED;
}
@@ -2005,8 +2008,7 @@ static int smsc911x_init(struct net_device *dev)
dev->set_multicast_list = smsc911x_set_multicast_list;
dev->flags |= IFF_MULTICAST;
dev->do_ioctl = smsc911x_do_ioctl;
- dev->poll = smsc911x_poll;
- dev->weight = 64;
+ netif_napi_add(dev, &pdata->napi, smsc911x_poll, 64);
dev->ethtool_ops = &smsc911x_ethtool_ops;
#ifdef CONFIG_NET_POLL_CONTROLLER
@@ -2092,12 +2094,12 @@ static int smsc911x_drv_probe(struct
platform_device *pdev)
retval = -ENOMEM;
goto out_release_io_1;
}
-
- SET_MODULE_OWNER(dev);
+
SET_NETDEV_DEV(dev, &pdev->dev);
pdata = netdev_priv(dev);
-
+ pdata->netdev = dev;
+
dev->irq = platform_get_irq(pdev, 0);
pdata->ioaddr = ioremap_nocache(res->start, res_size);
-
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