Subject: [PATCH 4/13] forcedeth: save irq events for napi processing

From: Ayaz Abdulla <[email-masked]>
Date: Thu, 05 Mar 2009 13:02:03 -0500

This patch will save the irq events in the driver's context so that the 
napi routine knows which interrupts have occurred. Subsequent changes 
will be moving all interrupt processing into the napi poll routine.

Signed-off-by: Ayaz Abdulla <[email-masked]>

--- old/drivers/net/forcedeth.c	2009-03-05 10:39:55.000000000 -0800
+++ new/drivers/net/forcedeth.c	2009-03-05 10:40:17.000000000 -0800
@@ -759,6 +759,7 @@
 	dma_addr_t ring_addr;
 	struct pci_dev *pci_dev;
 	u32 orig_mac[2];
+	u32 events;
 	u32 irqmask;
 	u32 desc_ver;
 	u32 txrxctl_bits;
@@ -3417,21 +3418,20 @@
 	struct net_device *dev = (struct net_device *) data;
 	struct fe_priv *np = netdev_priv(dev);
 	u8 __iomem *base = get_hwbase(dev);
-	u32 events;
 	int i;
 
 	dprintk(KERN_DEBUG "%s: nv_nic_irq\n", dev->name);
 
 	for (i=0; ; i++) {
 		if (!(np->msi_flags & NV_MSI_X_ENABLED)) {
-			events = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK;
+			np->events = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK;
 			writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
 		} else {
-			events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK;
+			np->events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK;
 			writel(NVREG_IRQSTAT_MASK, base + NvRegMSIXIrqStatus);
 		}
-		dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, events);
-		if (!(events & np->irqmask))
+		dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, np->events);
+		if (!(np->events & np->irqmask))
 			break;
 
 		nv_msi_workaround(np);
@@ -3441,7 +3441,7 @@
 		spin_unlock(&np->lock);
 
 #ifdef CONFIG_FORCEDETH_NAPI
-		if (events & NVREG_IRQ_RX_ALL) {
+		if (np->events & NVREG_IRQ_RX_ALL) {
 			spin_lock(&np->lock);
 			napi_schedule(&np->napi);
 
@@ -3464,7 +3464,7 @@
 			}
 		}
 #endif
-		if (unlikely(events & NVREG_IRQ_LINK)) {
+		if (unlikely(np->events & NVREG_IRQ_LINK)) {
 			spin_lock(&np->lock);
 			nv_link_irq(dev);
 			spin_unlock(&np->lock);
@@ -3475,15 +3475,15 @@
 			spin_unlock(&np->lock);
 			np->link_timeout = jiffies + LINK_TIMEOUT;
 		}
-		if (unlikely(events & (NVREG_IRQ_TX_ERR))) {
+		if (unlikely(np->events & (NVREG_IRQ_TX_ERR))) {
 			dprintk(KERN_DEBUG "%s: received irq with events 0x%x. Probably TX fail.\n",
-						dev->name, events);
+						dev->name, np->events);
 		}
-		if (unlikely(events & (NVREG_IRQ_UNKNOWN))) {
+		if (unlikely(np->events & (NVREG_IRQ_UNKNOWN))) {
 			printk(KERN_DEBUG "%s: received irq with unknown events 0x%x. Please report\n",
-						dev->name, events);
+						dev->name, np->events);
 		}
-		if (unlikely(events & NVREG_IRQ_RECOVER_ERROR)) {
+		if (unlikely(np->events & NVREG_IRQ_RECOVER_ERROR)) {
 			spin_lock(&np->lock);
 			/* disable interrupts on the nic */
 			if (!(np->msi_flags & NV_MSI_X_ENABLED))
@@ -3534,21 +3534,20 @@
 	struct net_device *dev = (struct net_device *) data;
 	struct fe_priv *np = netdev_priv(dev);
 	u8 __iomem *base = get_hwbase(dev);
-	u32 events;
 	int i;
 
 	dprintk(KERN_DEBUG "%s: nv_nic_irq_optimized\n", dev->name);
 
 	for (i=0; ; i++) {
 		if (!(np->msi_flags & NV_MSI_X_ENABLED)) {
-			events = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK;
+			np->events = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK;
 			writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
 		} else {
-			events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK;
+			np->events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK;
 			writel(NVREG_IRQSTAT_MASK, base + NvRegMSIXIrqStatus);
 		}
-		dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, events);
-		if (!(events & np->irqmask))
+		dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, np->events);
+		if (!(np->events & np->irqmask))
 			break;
 
 		nv_msi_workaround(np);
@@ -3558,7 +3557,7 @@
 		spin_unlock(&np->lock);
 
 #ifdef CONFIG_FORCEDETH_NAPI
-		if (events & NVREG_IRQ_RX_ALL) {
+		if (np->events & NVREG_IRQ_RX_ALL) {
 			spin_lock(&np->lock);
 			napi_schedule(&np->napi);
 
@@ -3581,7 +3580,7 @@
 			}
 		}
 #endif
-		if (unlikely(events & NVREG_IRQ_LINK)) {
+		if (unlikely(np->events & NVREG_IRQ_LINK)) {
 			spin_lock(&np->lock);
 			nv_link_irq(dev);
 			spin_unlock(&np->lock);
@@ -3592,15 +3591,15 @@
 			spin_unlock(&np->lock);
 			np->link_timeout = jiffies + LINK_TIMEOUT;
 		}
-		if (unlikely(events & (NVREG_IRQ_TX_ERR))) {
+		if (unlikely(np->events & (NVREG_IRQ_TX_ERR))) {
 			dprintk(KERN_DEBUG "%s: received irq with events 0x%x. Probably TX fail.\n",
-						dev->name, events);
+						dev->name, np->events);
 		}
-		if (unlikely(events & (NVREG_IRQ_UNKNOWN))) {
+		if (unlikely(np->events & (NVREG_IRQ_UNKNOWN))) {
 			printk(KERN_DEBUG "%s: received irq with unknown events 0x%x. Please report\n",
-						dev->name, events);
+						dev->name, np->events);
 		}
-		if (unlikely(events & NVREG_IRQ_RECOVER_ERROR)) {
+		if (unlikely(np->events & NVREG_IRQ_RECOVER_ERROR)) {
 			spin_lock(&np->lock);
 			/* disable interrupts on the nic */
 			if (!(np->msi_flags & NV_MSI_X_ENABLED))