[PATCH 0/4] backport of sky2 stability fixes

[PATCH 0/4] backport of sky2 stability fixes

[Stephen Hemminger]

These are bugfixes that happened late in 2.6.22 cycle that missed
getting merged.

-- 

[PATCH 1/4] sky2: restore workarounds for lost interrupts

[Stephen Hemminger]

[-- Attachment #1: sky2-lost-irq.patch --]
[-- Type: text/plain, Size: 1351 bytes --]

Backport of commit c59697e06058fc2361da8cefcfa3de85ac107582

This patch restores a couple of workarounds from 2.6.16:
 * restart transmit moderation timer in case it expires during IRQ routine
 * default to having 10 HZ watchdog timer.
At this point it more important not to hang than to worry about the
power cost.
    
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

--- a/drivers/net/sky2.c	2007-08-08 21:50:10.000000000 +0100
+++ b/drivers/net/sky2.c	2007-08-08 22:01:00.000000000 +0100
@@ -96,7 +96,7 @@ static int disable_msi = 0;
 module_param(disable_msi, int, 0);
 MODULE_PARM_DESC(disable_msi, "Disable Message Signaled Interrupt (MSI)");
 
-static int idle_timeout = 0;
+static int idle_timeout = 100;
 module_param(idle_timeout, int, 0);
 MODULE_PARM_DESC(idle_timeout, "Watchdog timer for lost interrupts (ms)");
 
@@ -2442,6 +2442,13 @@ static int sky2_poll(struct net_device *
 
 	work_done = sky2_status_intr(hw, work_limit);
 	if (work_done < work_limit) {
+		/* Bug/Errata workaround?
+		 * Need to kick the TX irq moderation timer.
+		 */
+		if (sky2_read8(hw, STAT_TX_TIMER_CTRL) == TIM_START) {
+			sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_STOP);
+			sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
+		}
 		netif_rx_complete(dev0);
 
 		/* end of interrupt, re-enables also acts as I/O synchronization */

-- 

[PATCH 2/4] sky2: carrier management

[Stephen Hemminger]

[-- Attachment #1: sky2-carrier-mgmt.patch --]
[-- Type: text/plain, Size: 1917 bytes --]

backport of commit 55d7b4e6ed6ad3ec5e5e30b3b4515a0a6a53e344
    
Make sky2 handle carrier similar to other drivers,
eliminate some possible races in carrier state transistions.
    
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

--- a/drivers/net/sky2.c	2007-08-08 22:01:00.000000000 +0100
+++ b/drivers/net/sky2.c	2007-08-08 22:01:11.000000000 +0100
@@ -1234,6 +1234,8 @@ static int sky2_up(struct net_device *de
 	if (netif_msg_ifup(sky2))
 		printk(KERN_INFO PFX "%s: enabling interface\n", dev->name);
 
+	netif_carrier_off(dev);
+
 	/* must be power of 2 */
 	sky2->tx_le = pci_alloc_consistent(hw->pdev,
 					   TX_RING_SIZE *
@@ -1573,7 +1575,6 @@ static int sky2_down(struct net_device *
 
 	/* Stop more packets from being queued */
 	netif_stop_queue(dev);
-	netif_carrier_off(dev);
 
 	/* Disable port IRQ */
 	imask = sky2_read32(hw, B0_IMSK);
@@ -1625,6 +1626,8 @@ static int sky2_down(struct net_device *
 
 	sky2_phy_power(hw, port, 0);
 
+	netif_carrier_off(dev);
+
 	/* turn off LED's */
 	sky2_write16(hw, B0_Y2LED, LED_STAT_OFF);
 
@@ -1689,7 +1692,6 @@ static void sky2_link_up(struct sky2_por
 	gm_phy_write(hw, port, PHY_MARV_INT_MASK, PHY_M_DEF_MSK);
 
 	netif_carrier_on(sky2->netdev);
-	netif_wake_queue(sky2->netdev);
 
 	/* Turn on link LED */
 	sky2_write8(hw, SK_REG(port, LNK_LED_REG),
@@ -1741,7 +1743,6 @@ static void sky2_link_down(struct sky2_p
 	gma_write16(hw, port, GM_GP_CTRL, reg);
 
 	netif_carrier_off(sky2->netdev);
-	netif_stop_queue(sky2->netdev);
 
 	/* Turn on link LED */
 	sky2_write8(hw, SK_REG(port, LNK_LED_REG), LINKLED_OFF);
@@ -3493,10 +3494,6 @@ static __devinit struct net_device *sky2
 	memcpy_fromio(dev->dev_addr, hw->regs + B2_MAC_1 + port * 8, ETH_ALEN);
 	memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
 
-	/* device is off until link detection */
-	netif_carrier_off(dev);
-	netif_stop_queue(dev);
-
 	return dev;
 }
 

-- 

[PATCH 3/4] sky2: check for more work before leaving NAPI

[Stephen Hemminger]

[-- Attachment #1: sky2-napi-fill.patch --]
[-- Type: text/plain, Size: 2050 bytes --]

Backport of commit 5c11ce700f77fada15b6264417d72462da4bbb1c
    
This patch avoids generating another IRQ if more packets
arrive while in the NAPI poll routine. Before marking device as
finished, it rechecks that the status ring is empty.
    
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

--- a/drivers/net/sky2.c	2007-08-08 22:01:11.000000000 +0100
+++ b/drivers/net/sky2.c	2007-08-08 22:01:28.000000000 +0100
@@ -2428,8 +2428,7 @@ static void sky2_err_intr(struct sky2_hw
 static int sky2_poll(struct net_device *dev0, int *budget)
 {
 	struct sky2_hw *hw = ((struct sky2_port *) netdev_priv(dev0))->hw;
-	int work_limit = min(dev0->quota, *budget);
-	int work_done = 0;
+	int work_done;
 	u32 status = sky2_read32(hw, B0_Y2_SP_EISR);
 
 	if (unlikely(status & Y2_IS_ERROR))
@@ -2441,25 +2440,25 @@ static int sky2_poll(struct net_device *
 	if (status & Y2_IS_IRQ_PHY2)
 		sky2_phy_intr(hw, 1);
 
-	work_done = sky2_status_intr(hw, work_limit);
-	if (work_done < work_limit) {
-		/* Bug/Errata workaround?
-		 * Need to kick the TX irq moderation timer.
-		 */
-		if (sky2_read8(hw, STAT_TX_TIMER_CTRL) == TIM_START) {
-			sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_STOP);
-			sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
-		}
-		netif_rx_complete(dev0);
+	work_done = sky2_status_intr(hw, min(dev0->quota, *budget));
+	*budget -= work_done;
+	dev0->quota -= work_done;
 
-		/* end of interrupt, re-enables also acts as I/O synchronization */
-		sky2_read32(hw, B0_Y2_SP_LISR);
-		return 0;
-	} else {
-		*budget -= work_done;
-		dev0->quota -= work_done;
+	/* More work? */
+ 	if (hw->st_idx != sky2_read16(hw, STAT_PUT_IDX))
 		return 1;
+
+	/* Bug/Errata workaround?
+	 * Need to kick the TX irq moderation timer.
+	 */
+	if (sky2_read8(hw, STAT_TX_TIMER_CTRL) == TIM_START) {
+		sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_STOP);
+		sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
 	}
+	netif_rx_complete(dev0);
+
+	sky2_read32(hw, B0_Y2_SP_LISR);
+	return 0;
 }
 
 static irqreturn_t sky2_intr(int irq, void *dev_id)

-- 

[PATCH 4/4] sky2: check drop truncated packets

[Stephen Hemminger]

[-- Attachment #1: sky2-stable-trunc.patch --]
[-- Type: text/plain, Size: 909 bytes --]

Backport of commit 71749531f2d1954137a1a77422ef4ff29eb102dd
    
If packet larger than MTU is received, the driver uses hardware to
truncate the packet. Use the status registers to catch/drop them.
    
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

--- a/drivers/net/sky2.c	2007-08-08 22:01:28.000000000 +0100
+++ b/drivers/net/sky2.c	2007-08-08 22:01:37.000000000 +0100
@@ -2065,6 +2065,9 @@ static struct sk_buff *sky2_receive(stru
 	if (!(status & GMR_FS_RX_OK))
 		goto resubmit;
 
+	if (status >> 16 != length)
+		goto len_mismatch;
+
 	if (length < copybreak)
 		skb = receive_copy(sky2, re, length);
 	else
@@ -2074,6 +2077,11 @@ resubmit:
 
 	return skb;
 
+len_mismatch:
+	/* Truncation of overlength packets
+	   causes PHY length to not match MAC length */
+	++sky2->net_stats.rx_length_errors;
+
 error:
 	++sky2->net_stats.rx_errors;
 	if (status & GMR_FS_RX_FF_OV) {

--