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openwrt-xburst/target/linux/rb532-2.6/patches/240-via_rhine_performance.patch
nbd c80ac2c924 massive via-rhine performance improvements 
git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@3961 3c298f89-4303-0410-b956-a3cf2f4a3e73
2006-06-16 05:30:34 +00:00

462 lines
14 KiB
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diff -urN linux.old/drivers/net/via-rhine.c linux.dev/drivers/net/via-rhine.c
--- linux.old/drivers/net/via-rhine.c 2006-06-08 20:21:20.000000000 +0200
+++ linux.dev/drivers/net/via-rhine.c 2006-06-08 20:19:40.000000000 +0200
@@ -131,6 +131,10 @@
- Fix Tx engine race for good
- Craig Brind: Zero padded aligned buffers for short packets.
+ OpenWrt Version (Felix Fietkau <nbd@openwrt.org>)
+ - Performance improvements
+ - NAPI polling
+
*/
#define DRV_NAME "via-rhine"
@@ -142,7 +146,6 @@
These may be modified when a driver module is loaded. */
static int debug = 1; /* 1 normal messages, 0 quiet .. 7 verbose. */
-static int max_interrupt_work = 20;
/* Set the copy breakpoint for the copy-only-tiny-frames scheme.
Setting to > 1518 effectively disables this feature. */
@@ -165,9 +168,9 @@
Making the Tx ring too large decreases the effectiveness of channel
bonding and packet priority.
There are no ill effects from too-large receive rings. */
-#define TX_RING_SIZE 16
-#define TX_QUEUE_LEN 10 /* Limit ring entries actually used. */
-#define RX_RING_SIZE 16
+#define TX_RING_SIZE 128
+#define TX_QUEUE_LEN 120 /* Limit ring entries actually used. */
+#define RX_RING_SIZE 128
/* Operational parameters that usually are not changed. */
@@ -201,6 +204,7 @@
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
+#include <asm/unaligned.h>
/* These identify the driver base version and may not be removed. */
static char version[] __devinitdata =
@@ -217,10 +221,8 @@
MODULE_DESCRIPTION("VIA Rhine PCI Fast Ethernet driver");
MODULE_LICENSE("GPL");
-module_param(max_interrupt_work, int, 0);
module_param(debug, int, 0);
module_param(rx_copybreak, int, 0);
-MODULE_PARM_DESC(max_interrupt_work, "VIA Rhine maximum events handled per interrupt");
MODULE_PARM_DESC(debug, "VIA Rhine debug level (0-7)");
MODULE_PARM_DESC(rx_copybreak, "VIA Rhine copy breakpoint for copy-only-tiny-frames");
@@ -461,6 +463,8 @@
struct tx_desc *tx_ring;
dma_addr_t rx_ring_dma;
dma_addr_t tx_ring_dma;
+ u32 istat;
+ u32 imask;
/* The addresses of receive-in-place skbuffs. */
struct sk_buff *rx_skbuff[RX_RING_SIZE];
@@ -504,9 +508,10 @@
static void rhine_check_media_task(struct net_device *dev);
static int rhine_start_tx(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t rhine_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
-static void rhine_tx(struct net_device *dev);
-static void rhine_rx(struct net_device *dev);
-static void rhine_error(struct net_device *dev, int intr_status);
+static int rhine_poll(struct net_device *dev, int *budget);
+static int rhine_tx(struct net_device *dev);
+static int rhine_rx(struct net_device *dev);
+static void rhine_error(struct net_device *dev);
static void rhine_set_rx_mode(struct net_device *dev);
static struct net_device_stats *rhine_get_stats(struct net_device *dev);
static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
@@ -601,6 +606,8 @@
struct rhine_private *rp = netdev_priv(dev);
void __iomem *ioaddr = rp->base;
+ pci_enable_device(rp->pdev);
+
iowrite8(Cmd1Reset, ioaddr + ChipCmd1);
IOSYNC;
@@ -622,6 +629,28 @@
"failed" : "succeeded");
}
+static inline void rhine_intr_enable(struct net_device *dev)
+{
+ struct rhine_private *rp = netdev_priv(dev);
+ void __iomem *ioaddr = rp->base;
+
+ iowrite16(rp->imask = (IntrRxDone | IntrRxErr | IntrRxEmpty| IntrRxOverflow |
+ IntrRxDropped | IntrRxNoBuf | IntrTxAborted |
+ IntrTxDone | IntrTxError | IntrTxUnderrun |
+ IntrPCIErr | IntrStatsMax | IntrLinkChange),
+ ioaddr + IntrEnable);
+}
+
+static inline void rhine_intr_disable(struct net_device *dev)
+{
+ struct rhine_private *rp = netdev_priv(dev);
+ void __iomem *ioaddr = rp->base;
+
+ iowrite16(rp->imask = (IntrRxOverflow | IntrRxNoBuf | IntrTxAborted |
+ IntrTxError | IntrTxUnderrun | IntrPCIErr | IntrStatsMax | IntrLinkChange),
+ ioaddr + IntrEnable);
+}
+
#ifdef USE_MMIO
static void enable_mmio(long pioaddr, u32 quirks)
{
@@ -664,14 +693,26 @@
}
-#ifdef CONFIG_NET_POLL_CONTROLLER
-static void rhine_poll(struct net_device *dev)
+static int rhine_poll(struct net_device *dev, int *budget)
{
- disable_irq(dev->irq);
- rhine_interrupt(dev->irq, (void *)dev, NULL);
- enable_irq(dev->irq);
+ unsigned int work_done, work_to_do = min(*budget, dev->quota);
+ struct rhine_private *rp = netdev_priv(dev);
+
+ work_done = rhine_rx(dev);
+
+ if (rp->istat & (IntrTxErrSummary | IntrTxDone))
+ rhine_tx(dev);
+
+ *budget -= work_done;
+ dev->quota -= work_done;
+
+ if (work_done < work_to_do) {
+ netif_rx_complete(dev);
+ rhine_intr_enable(dev);
+ }
+
+ return (work_done >= work_to_do);
}
-#endif
static void rhine_hw_init(struct net_device *dev, long pioaddr)
{
@@ -850,11 +891,10 @@
dev->ethtool_ops = &netdev_ethtool_ops;
dev->tx_timeout = rhine_tx_timeout;
dev->watchdog_timeo = TX_TIMEOUT;
-#ifdef CONFIG_NET_POLL_CONTROLLER
- dev->poll_controller = rhine_poll;
-#endif
- if (rp->quirks & rqRhineI)
- dev->features |= NETIF_F_SG|NETIF_F_HW_CSUM;
+ dev->poll = rhine_poll;
+ dev->weight = 64;
+
+ dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
INIT_WORK(&rp->tx_timeout_task,
(void (*)(void *))rhine_tx_timeout_task, dev);
@@ -904,6 +944,10 @@
}
}
rp->mii_if.phy_id = phy_id;
+
+ // shut down until somebody really needs it
+ iowrite8(0x80, ioaddr + 0xa1);
+ pci_set_power_state(rp->pdev, 3);
return 0;
@@ -995,7 +1039,7 @@
/* Fill in the Rx buffers. Handle allocation failure gracefully. */
for (i = 0; i < RX_RING_SIZE; i++) {
- struct sk_buff *skb = dev_alloc_skb(rp->rx_buf_sz);
+ struct sk_buff *skb = dev_alloc_skb(rp->rx_buf_sz + 4);
rp->rx_skbuff[i] = skb;
if (skb == NULL)
break;
@@ -1115,11 +1159,7 @@
rhine_set_rx_mode(dev);
/* Enable interrupts by setting the interrupt mask. */
- iowrite16(IntrRxDone | IntrRxErr | IntrRxEmpty| IntrRxOverflow |
- IntrRxDropped | IntrRxNoBuf | IntrTxAborted |
- IntrTxDone | IntrTxError | IntrTxUnderrun |
- IntrPCIErr | IntrStatsMax | IntrLinkChange,
- ioaddr + IntrEnable);
+ rhine_intr_enable(dev);
iowrite16(CmdStart | CmdTxOn | CmdRxOn | (Cmd1NoTxPoll << 8),
ioaddr + ChipCmd);
@@ -1230,6 +1270,7 @@
mdio_read(dev, rp->mii_if.phy_id, MII_BMSR));
netif_start_queue(dev);
+ netif_poll_enable(dev);
return 0;
}
@@ -1268,8 +1309,8 @@
/* Reinitialize the hardware. */
rhine_chip_reset(dev);
init_registers(dev);
-
spin_unlock(&rp->lock);
+
enable_irq(rp->pdev->irq);
dev->trans_start = jiffies;
@@ -1363,69 +1404,56 @@
struct net_device *dev = dev_instance;
struct rhine_private *rp = netdev_priv(dev);
void __iomem *ioaddr = rp->base;
- u32 intr_status;
- int boguscnt = max_interrupt_work;
int handled = 0;
- while ((intr_status = get_intr_status(dev))) {
+ if ((rp->istat = (get_intr_status(dev) & rp->imask))) {
handled = 1;
/* Acknowledge all of the current interrupt sources ASAP. */
- if (intr_status & IntrTxDescRace)
+ if (rp->istat & IntrTxDescRace)
iowrite8(0x08, ioaddr + IntrStatus2);
- iowrite16(intr_status & 0xffff, ioaddr + IntrStatus);
+ iowrite16(rp->istat & 0xffff, ioaddr + IntrStatus);
IOSYNC;
- if (debug > 4)
- printk(KERN_DEBUG "%s: Interrupt, status %8.8x.\n",
- dev->name, intr_status);
+ if (likely(rp->istat & ((IntrRxDone | IntrRxErr | IntrRxDropped |
+ IntrRxWakeUp | IntrRxEmpty | IntrRxNoBuf |
+ IntrTxErrSummary | IntrTxDone)))) {
+
+ rhine_intr_disable(dev);
- if (intr_status & (IntrRxDone | IntrRxErr | IntrRxDropped |
- IntrRxWakeUp | IntrRxEmpty | IntrRxNoBuf))
- rhine_rx(dev);
-
- if (intr_status & (IntrTxErrSummary | IntrTxDone)) {
- if (intr_status & IntrTxErrSummary) {
- /* Avoid scavenging before Tx engine turned off */
- RHINE_WAIT_FOR(!(ioread8(ioaddr+ChipCmd) & CmdTxOn));
- if (debug > 2 &&
- ioread8(ioaddr+ChipCmd) & CmdTxOn)
- printk(KERN_WARNING "%s: "
- "rhine_interrupt() Tx engine"
- "still on.\n", dev->name);
- }
- rhine_tx(dev);
+ if (likely(netif_rx_schedule_prep(dev)))
+ __netif_rx_schedule(dev);
}
/* Abnormal error summary/uncommon events handlers. */
- if (intr_status & (IntrPCIErr | IntrLinkChange |
+ if (unlikely(rp->istat & (IntrPCIErr | IntrLinkChange |
IntrStatsMax | IntrTxError | IntrTxAborted |
- IntrTxUnderrun | IntrTxDescRace))
- rhine_error(dev, intr_status);
-
- if (--boguscnt < 0) {
- printk(KERN_WARNING "%s: Too much work at interrupt, "
- "status=%#8.8x.\n",
- dev->name, intr_status);
- break;
- }
+ IntrTxUnderrun | IntrTxDescRace)))
+ rhine_error(dev);
}
- if (debug > 3)
- printk(KERN_DEBUG "%s: exiting interrupt, status=%8.8x.\n",
- dev->name, ioread16(ioaddr + IntrStatus));
return IRQ_RETVAL(handled);
}
/* This routine is logically part of the interrupt handler, but isolated
for clarity. */
-static void rhine_tx(struct net_device *dev)
+static int rhine_tx(struct net_device *dev)
{
struct rhine_private *rp = netdev_priv(dev);
int txstatus = 0, entry = rp->dirty_tx % TX_RING_SIZE;
+ void __iomem *ioaddr = rp->base;
+ int done = 0;
- spin_lock(&rp->lock);
+ /* Avoid scavenging before Tx engine turned off */
+ RHINE_WAIT_FOR(!(ioread8(ioaddr+ChipCmd) & CmdTxOn));
+ if (debug > 2 &&
+ ioread8(ioaddr+ChipCmd) & CmdTxOn)
+ printk(KERN_WARNING "%s: "
+ "rhine_interrupt() Tx engine"
+ "still on.\n", dev->name);
+
+ spin_lock_irq(&rp->lock);
/* find and cleanup dirty tx descriptors */
while (rp->dirty_tx != rp->cur_tx) {
txstatus = le32_to_cpu(rp->tx_ring[entry].tx_status);
@@ -1462,6 +1490,7 @@
txstatus & 0xF);
rp->stats.tx_bytes += rp->tx_skbuff[entry]->len;
rp->stats.tx_packets++;
+ done++;
}
/* Free the original skb. */
if (rp->tx_skbuff_dma[entry]) {
@@ -1470,23 +1499,25 @@
rp->tx_skbuff[entry]->len,
PCI_DMA_TODEVICE);
}
- dev_kfree_skb_irq(rp->tx_skbuff[entry]);
+ dev_kfree_skb_any(rp->tx_skbuff[entry]);
rp->tx_skbuff[entry] = NULL;
entry = (++rp->dirty_tx) % TX_RING_SIZE;
}
+ spin_unlock_irq(&rp->lock);
+
if ((rp->cur_tx - rp->dirty_tx) < TX_QUEUE_LEN - 4)
netif_wake_queue(dev);
- spin_unlock(&rp->lock);
+ return done;
}
/* This routine is logically part of the interrupt handler, but isolated
for clarity and better register allocation. */
-static void rhine_rx(struct net_device *dev)
+static int rhine_rx(struct net_device *dev)
{
struct rhine_private *rp = netdev_priv(dev);
int entry = rp->cur_rx % RX_RING_SIZE;
- int boguscnt = rp->dirty_rx + RX_RING_SIZE - rp->cur_rx;
+ int done = 0;
if (debug > 4) {
printk(KERN_DEBUG "%s: rhine_rx(), entry %d status %8.8x.\n",
@@ -1503,8 +1534,6 @@
if (debug > 4)
printk(KERN_DEBUG "rhine_rx() status is %8.8x.\n",
desc_status);
- if (--boguscnt < 0)
- break;
if ((desc_status & (RxWholePkt | RxErr)) != RxWholePkt) {
if ((desc_status & RxWholePkt) != RxWholePkt) {
printk(KERN_WARNING "%s: Oversized Ethernet "
@@ -1528,9 +1557,7 @@
if (desc_status & 0x0004) rp->stats.rx_frame_errors++;
if (desc_status & 0x0002) {
/* this can also be updated outside the interrupt handler */
- spin_lock(&rp->lock);
rp->stats.rx_crc_errors++;
- spin_unlock(&rp->lock);
}
}
} else {
@@ -1558,6 +1585,7 @@
rp->rx_buf_sz,
PCI_DMA_FROMDEVICE);
} else {
+ int i;
skb = rp->rx_skbuff[entry];
if (skb == NULL) {
printk(KERN_ERR "%s: Inconsistent Rx "
@@ -1566,6 +1594,14 @@
break;
}
rp->rx_skbuff[entry] = NULL;
+
+ /* align the data to the ip header - should be faster than using rx_copybreak */
+ for (i = pkt_len - (pkt_len % 4); i >= 0; i -= 4) {
+ put_unaligned(*((u32 *) (skb->data + i)), (u32 *) (skb->data + i + 2));
+ }
+ skb->data += 2;
+ skb->tail += 2;
+
skb_put(skb, pkt_len);
pci_unmap_single(rp->pdev,
rp->rx_skbuff_dma[entry],
@@ -1573,10 +1609,11 @@
PCI_DMA_FROMDEVICE);
}
skb->protocol = eth_type_trans(skb, dev);
- netif_rx(skb);
+ netif_receive_skb(skb);
dev->last_rx = jiffies;
rp->stats.rx_bytes += pkt_len;
rp->stats.rx_packets++;
+ done++;
}
entry = (++rp->cur_rx) % RX_RING_SIZE;
rp->rx_head_desc = &rp->rx_ring[entry];
@@ -1587,7 +1624,7 @@
struct sk_buff *skb;
entry = rp->dirty_rx % RX_RING_SIZE;
if (rp->rx_skbuff[entry] == NULL) {
- skb = dev_alloc_skb(rp->rx_buf_sz);
+ skb = dev_alloc_skb(rp->rx_buf_sz + 4);
rp->rx_skbuff[entry] = skb;
if (skb == NULL)
break; /* Better luck next round. */
@@ -1600,6 +1637,8 @@
}
rp->rx_ring[entry].rx_status = cpu_to_le32(DescOwn);
}
+
+ return done;
}
/*
@@ -1649,11 +1688,11 @@
}
-static void rhine_error(struct net_device *dev, int intr_status)
+static void rhine_error(struct net_device *dev)
{
struct rhine_private *rp = netdev_priv(dev);
void __iomem *ioaddr = rp->base;
-
+ u32 intr_status = rp->istat;
spin_lock(&rp->lock);
if (intr_status & IntrLinkChange)
@@ -1898,6 +1937,7 @@
/* Disable interrupts by clearing the interrupt mask. */
iowrite16(0x0000, ioaddr + IntrEnable);
+ rp->imask = 0;
/* Stop the chip's Tx and Rx processes. */
iowrite16(CmdStop, ioaddr + ChipCmd);
@@ -1912,6 +1952,9 @@
free_tbufs(dev);
free_ring(dev);
+ writeb(0x80, ioaddr + 0xa1);
+ pci_set_power_state(rp->pdev, 3);
+
return 0;
}
@@ -1941,6 +1984,7 @@
return; /* Nothing to do for non-WOL adapters */
rhine_power_init(dev);
+ netif_poll_disable(dev);
/* Make sure we use pattern 0, 1 and not 4, 5 */
if (rp->quirks & rq6patterns)
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