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sky2: receive FIFO checking

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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>
This commit is contained in:
Stephen Hemminger 2007-09-19 15:36:46 -07:00 committed by Jeff Garzik
parent 05745c4ab1
commit 75e806838a
2 changed files with 66 additions and 17 deletions
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74
drivers/net/sky2.c
View File

@ -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 */

9
drivers/net/sky2.h
View File

@ -2027,6 +2027,14 @@ struct sky2_port {
u16 rx_tag;
struct vlan_group *vlgrp;
#endif
struct {
unsigned long last;
u32 mac_rp;
u8 mac_lev;
u8 fifo_rp;
u8 fifo_lev;
} check;
dma_addr_t rx_le_map;
dma_addr_t tx_le_map;
@ -2064,7 +2072,6 @@ struct sky2_hw {
u8 chip_rev;
u8 pmd_type;
u8 ports;
u8 active;
struct sky2_status_le *st_le;
u32 st_idx;