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authorStephen Hemminger <shemminger@linux-foundation.org>2007-09-19 15:36:46 -0700
committerJeff Garzik <jeff@garzik.org>2007-09-20 15:23:00 -0400
commit75e806838a3327d4ca9030e588d34de11b04f341 (patch)
tree11dff9f4326b300ff80cbc4f627f797a06ad8c52 /drivers/net/sky2.c
parent05745c4ab1c58fbb6ab8e8d3a40e0e395d7e2b0e (diff)
downloadop-kernel-dev-75e806838a3327d4ca9030e588d34de11b04f341.zip
op-kernel-dev-75e806838a3327d4ca9030e588d34de11b04f341.tar.gz
sky2: receive FIFO checking
A driver writer from another operating system hinted that the versions of Yukon 2 chip with rambuffer (EC and XL) have a hardware bug that if the FIFO ever gets completely full it will hang. Sounds like a classic ring full vs ring empty wrap around bug. As a workaround, use the existing watchdog timer to check for ring full lockup. Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net/sky2.c')
-rw-r--r--drivers/net/sky2.c74
1 files changed, 58 insertions, 16 deletions
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index d0e5875..2831f44 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1648,9 +1648,6 @@ static int sky2_down(struct net_device *dev)
if (netif_msg_ifdown(sky2))
printk(KERN_INFO PFX "%s: disabling interface\n", dev->name);
- if (netif_carrier_ok(dev) && --hw->active == 0)
- del_timer(&hw->watchdog_timer);
-
/* Stop more packets from being queued */
netif_stop_queue(dev);
@@ -1775,9 +1772,7 @@ static void sky2_link_up(struct sky2_port *sky2)
netif_carrier_on(sky2->netdev);
- if (hw->active++ == 0)
- mod_timer(&hw->watchdog_timer, jiffies + 1);
-
+ mod_timer(&hw->watchdog_timer, jiffies + 1);
/* Turn on link LED */
sky2_write8(hw, SK_REG(port, LNK_LED_REG),
@@ -1828,11 +1823,6 @@ static void sky2_link_down(struct sky2_port *sky2)
netif_carrier_off(sky2->netdev);
- /* Stop watchdog if both ports are not active */
- if (--hw->active == 0)
- del_timer(&hw->watchdog_timer);
-
-
/* Turn on link LED */
sky2_write8(hw, SK_REG(port, LNK_LED_REG), LINKLED_OFF);
@@ -2484,20 +2474,72 @@ static void sky2_le_error(struct sky2_hw *hw, unsigned port,
sky2_write32(hw, Q_ADDR(q, Q_CSR), BMU_CLR_IRQ_CHK);
}
-/* Check for lost IRQ once a second */
+static int sky2_rx_hung(struct net_device *dev)
+{
+ struct sky2_port *sky2 = netdev_priv(dev);
+ struct sky2_hw *hw = sky2->hw;
+ unsigned port = sky2->port;
+ unsigned rxq = rxqaddr[port];
+ u32 mac_rp = sky2_read32(hw, SK_REG(port, RX_GMF_RP));
+ u8 mac_lev = sky2_read8(hw, SK_REG(port, RX_GMF_RLEV));
+ u8 fifo_rp = sky2_read8(hw, Q_ADDR(rxq, Q_RP));
+ u8 fifo_lev = sky2_read8(hw, Q_ADDR(rxq, Q_RL));
+
+ /* If idle and MAC or PCI is stuck */
+ if (sky2->check.last == dev->last_rx &&
+ ((mac_rp == sky2->check.mac_rp &&
+ mac_lev != 0 && mac_lev >= sky2->check.mac_lev) ||
+ /* Check if the PCI RX hang */
+ (fifo_rp == sky2->check.fifo_rp &&
+ fifo_lev != 0 && fifo_lev >= sky2->check.fifo_lev))) {
+ printk(KERN_DEBUG PFX "%s: hung mac %d:%d fifo %d (%d:%d)\n",
+ dev->name, mac_lev, mac_rp, fifo_lev, fifo_rp,
+ sky2_read8(hw, Q_ADDR(rxq, Q_WP)));
+ return 1;
+ } else {
+ sky2->check.last = dev->last_rx;
+ sky2->check.mac_rp = mac_rp;
+ sky2->check.mac_lev = mac_lev;
+ sky2->check.fifo_rp = fifo_rp;
+ sky2->check.fifo_lev = fifo_lev;
+ return 0;
+ }
+}
+
static void sky2_watchdog(unsigned long arg)
{
struct sky2_hw *hw = (struct sky2_hw *) arg;
+ struct net_device *dev;
+ /* Check for lost IRQ once a second */
if (sky2_read32(hw, B0_ISRC)) {
- struct net_device *dev = hw->dev[0];
-
+ dev = hw->dev[0];
if (__netif_rx_schedule_prep(dev))
__netif_rx_schedule(dev);
+ } else {
+ int i, active = 0;
+
+ for (i = 0; i < hw->ports; i++) {
+ dev = hw->dev[i];
+ if (!netif_running(dev))
+ continue;
+ ++active;
+
+ /* For chips with Rx FIFO, check if stuck */
+ if ((hw->flags & SKY2_HW_RAMBUFFER) &&
+ sky2_rx_hung(dev)) {
+ pr_info(PFX "%s: receiver hang detected\n",
+ dev->name);
+ schedule_work(&hw->restart_work);
+ return;
+ }
+ }
+
+ if (active == 0)
+ return;
}
- if (hw->active > 0)
- mod_timer(&hw->watchdog_timer, round_jiffies(jiffies + HZ));
+ mod_timer(&hw->watchdog_timer, round_jiffies(jiffies + HZ));
}
/* Hardware/software error handling */
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