[netdrvr tulip] support NAPI

Contributed by Robert Ollsson.

drivers/net/tulip/Kconfig

@@ -68,6 +68,26 @@ config TULIP_MMIO
 	  obscure bugs if your mainboard has memory controller timing issues.
 	  If in doubt, say N.
 
+config TULIP_NAPI
+	bool "Use NAPI RX polling "
+	depends on TULIP
+	---help---
+	  This is of useful for servers and routers dealing with high network loads.
+ 
+	  See <file:Documentation/networking/NAPI_HOWTO.txt>.
+
+	  If in doubt, say N.
+
+config TULIP_NAPI_HW_MITIGATION
+	bool "Use Interrupt Mitigation "
+	depends on TULIP_NAPI
+	---help---
+	  Use HW to reduce RX interrupts. Not strict necessary since NAPI reduces
+	  RX interrupts but itself. Although this reduces RX interrupts even at
+	  low levels traffic at the cost of a small latency.
+
+	  If in doubt, say Y.
+
 config DE4X5
 	tristate "Generic DECchip & DIGITAL EtherWORKS PCI/EISA"
 	depends on NET_TULIP && (PCI || EISA)

drivers/net/tulip/tulip.h

@@ -126,6 +126,7 @@ enum pci_cfg_driver_reg {
 	CFDD_Snooze = (1 << 30),
 };
 
+#define RxPollInt (RxIntr|RxNoBuf|RxDied|RxJabber)
 
 /* The bits in the CSR5 status registers, mostly interrupt sources. */
 enum status_bits {
@@ -251,9 +252,9 @@ enum t21143_csr6_bits {
    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 RX_RING_SIZE	32
 
+#define TX_RING_SIZE	32
+#define RX_RING_SIZE	128 
 #define MEDIA_MASK     31
 
 #define PKT_BUF_SZ		1536	/* Size of each temporary Rx buffer. */
@@ -343,17 +344,15 @@ struct tulip_private {
 	int flags;
 	struct net_device_stats stats;
 	struct timer_list timer;	/* Media selection timer. */
+	struct timer_list oom_timer;    /* Out of memory timer. */
 	u32 mc_filter[2];
 	spinlock_t lock;
 	spinlock_t mii_lock;
 	unsigned int cur_rx, cur_tx;	/* The next free ring entry */
 	unsigned int dirty_rx, dirty_tx;	/* The ring entries to be free()ed. */
 
-#ifdef CONFIG_NET_HW_FLOWCONTROL
-#define RX_A_NBF_STOP 0xffffff3f /* To disable RX and RX-NOBUF ints. */
-        int fc_bit;
-        int mit_sel;
-        int mit_change; /* Signal for Interrupt Mitigtion */
+#ifdef 	CONFIG_TULIP_NAPI_HW_MITIGATION
+        int mit_on;
 #endif
 	unsigned int full_duplex:1;	/* Full-duplex operation requested. */
 	unsigned int full_duplex_lock:1;
@@ -415,6 +414,10 @@ extern unsigned int tulip_max_interrupt_work;
 extern int tulip_rx_copybreak;
 irqreturn_t tulip_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
 int tulip_refill_rx(struct net_device *dev);
+#ifdef CONFIG_TULIP_NAPI
+int tulip_poll(struct net_device *dev, int *budget);
+#endif
+
 
 /* media.c */
 int tulip_mdio_read(struct net_device *dev, int phy_id, int location);
@@ -438,6 +441,7 @@ extern int tulip_debug;
 extern const char * const medianame[];
 extern const char tulip_media_cap[];
 extern struct tulip_chip_table tulip_tbl[];
+void oom_timer(unsigned long data);
 extern u8 t21040_csr13[];
 
 #ifndef USE_IO_OPS

drivers/net/tulip/tulip_core.c

@@ -14,11 +14,17 @@
 
 */
 
+#include <linux/config.h>
+
 #define DRV_NAME	"tulip"
+#ifdef CONFIG_TULIP_NAPI
+#define DRV_VERSION    "1.1.13-NAPI" /* Keep at least for test */
+#else
 #define DRV_VERSION	"1.1.13"
+#endif
 #define DRV_RELDATE	"May 11, 2002"
 
-#include <linux/config.h>
+
 #include <linux/module.h>
 #include "tulip.h"
 #include <linux/pci.h>
@@ -466,29 +472,16 @@ static void tulip_up(struct net_device *dev)
 	   to an alternate media type. */
 	tp->timer.expires = RUN_AT(next_tick);
 	add_timer(&tp->timer);
-}
-
-#ifdef CONFIG_NET_HW_FLOWCONTROL
-/* Enable receiver */
-void tulip_xon(struct net_device *dev)
-{
-        struct tulip_private *tp = (struct tulip_private *)dev->priv;
-
-        clear_bit(tp->fc_bit, &netdev_fc_xoff);
-        if (netif_running(dev)){
-
-                tulip_refill_rx(dev);
-                outl(tulip_tbl[tp->chip_id].valid_intrs,  dev->base_addr+CSR7);
-        }
-}
+#ifdef CONFIG_TULIP_NAPI
+	init_timer(&tp->oom_timer);
+        tp->oom_timer.data = (unsigned long)dev;
+        tp->oom_timer.function = oom_timer;
 #endif
+}
 
 static int
 tulip_open(struct net_device *dev)
 {
-#ifdef CONFIG_NET_HW_FLOWCONTROL
-        struct tulip_private *tp = (struct tulip_private *)dev->priv;
-#endif
 	int retval;
 
 	if ((retval = request_irq(dev->irq, &tulip_interrupt, SA_SHIRQ, dev->name, dev)))
@@ -498,10 +491,6 @@ tulip_open(struct net_device *dev)
 
 	tulip_up (dev);
 
-#ifdef CONFIG_NET_HW_FLOWCONTROL
-        tp->fc_bit = netdev_register_fc(dev, tulip_xon);
-#endif
-
 	netif_start_queue (dev);
 
 	return 0;
@@ -582,10 +571,7 @@ static void tulip_tx_timeout(struct net_device *dev)
 #endif
 
 	/* Stop and restart the chip's Tx processes . */
-#ifdef CONFIG_NET_HW_FLOWCONTROL
-        if (tp->fc_bit && test_bit(tp->fc_bit,&netdev_fc_xoff))
-                printk("BUG tx_timeout restarting rx when fc on\n");
-#endif
+
 	tulip_restart_rxtx(tp);
 	/* Trigger an immediate transmit demand. */
 	outl(0, ioaddr + CSR1);
@@ -742,7 +728,9 @@ static void tulip_down (struct net_device *dev)
 	unsigned long flags;
 
 	del_timer_sync (&tp->timer);
-
+#ifdef CONFIG_TULIP_NAPI
+	del_timer_sync (&tp->oom_timer);
+#endif
 	spin_lock_irqsave (&tp->lock, flags);
 
 	/* Disable interrupts by clearing the interrupt mask. */
@@ -781,13 +769,6 @@ static int tulip_close (struct net_device *dev)
 
 	netif_stop_queue (dev);
 
-#ifdef CONFIG_NET_HW_FLOWCONTROL
-        if (tp->fc_bit) {
-                int bit = tp->fc_bit;
-                tp->fc_bit = 0;
-                netdev_unregister_fc(bit);
-        }
-#endif
 	tulip_down (dev);
 
 	if (tulip_debug > 1)
@@ -1629,6 +1610,10 @@ static int __devinit tulip_init_one (struct pci_dev *pdev,
 	dev->hard_start_xmit = tulip_start_xmit;
 	dev->tx_timeout = tulip_tx_timeout;
 	dev->watchdog_timeo = TX_TIMEOUT;
+#ifdef CONFIG_TULIP_NAPI
+	dev->poll = tulip_poll;
+	dev->weight = 16;
+#endif
 	dev->stop = tulip_close;
 	dev->get_stats = tulip_get_stats;
 	dev->do_ioctl = private_ioctl;