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Date: Mon, 12 Mar 2007 16:18:58 -0700
From: Stephen Hemminger <shemminger@...ux-foundation.org>
To: Chris Stromsoe <cbs@....ucla.edu>
Cc: Jeff Garzik <jgarzik@...ox.com>, Jay Vosburgh <fubar@...ibm.com>,
netdev@...r.kernel.org
Subject: Re: [PATCH] skge: set mac address bonding fix
O
> * modprobe bonding miimon=100 mode=active-backup
> modprobe skge
> ifconfig bond0 up
> ifenslave bond0 eth2 eth3
> ifenslave -d bond0 eth2 eth3
>
> That hangs the machine. No output on serial console. I have to power
> cycle to restore access.
>
> * modprobe skge
> ifconfig eth2 up
> ifconfig eth3 up
> ifconfig eth3 down
> ifconfig eth2 down
Sounds like a dual-port only problem.. Unfortunately, I don't have actual
dual port skge hardware to test. Try this:
--- test.orig/drivers/net/skge.c
+++ test/drivers/net/skge.c
@@ -671,7 +671,7 @@ static void skge_led(struct skge_port *s
struct skge_hw *hw = skge->hw;
int port = skge->port;
- mutex_lock(&hw->phy_mutex);
+ spin_lock_bh(&skge->phy_lock);
if (hw->chip_id == CHIP_ID_GENESIS) {
switch (mode) {
case LED_MODE_OFF:
@@ -742,7 +742,7 @@ static void skge_led(struct skge_port *s
PHY_M_LED_MO_RX(MO_LED_ON));
}
}
- mutex_unlock(&hw->phy_mutex);
+ spin_unlock_bh(&skge->phy_lock);
}
/* blink LED's for finding board */
@@ -1316,7 +1316,7 @@ static void xm_phy_init(struct skge_port
xm_phy_write(hw, port, PHY_XMAC_CTRL, ctrl);
/* Poll PHY for status changes */
- schedule_delayed_work(&skge->link_thread, LINK_HZ);
+ mod_timer(&skge->link_timer, jiffies + LINK_HZ);
}
static void xm_check_link(struct net_device *dev)
@@ -1391,10 +1391,9 @@ static void xm_check_link(struct net_dev
* Since internal PHY is wired to a level triggered pin, can't
* get an interrupt when carrier is detected.
*/
-static void xm_link_timer(struct work_struct *work)
+static void xm_link_timer(unsigned long arg)
{
- struct skge_port *skge =
- container_of(work, struct skge_port, link_thread.work);
+ struct skge_port *skge = (struct skge_port *) arg;
struct net_device *dev = skge->netdev;
struct skge_hw *hw = skge->hw;
int port = skge->port;
@@ -1414,13 +1413,13 @@ static void xm_link_timer(struct work_st
goto nochange;
}
- mutex_lock(&hw->phy_mutex);
+ spin_lock(&skge->phy_lock);
xm_check_link(dev);
- mutex_unlock(&hw->phy_mutex);
+ spin_unlock(&skge->phy_lock);
nochange:
if (netif_running(dev))
- schedule_delayed_work(&skge->link_thread, LINK_HZ);
+ mod_timer(&skge->link_timer, jiffies + LINK_HZ);
}
static void genesis_mac_init(struct skge_hw *hw, int port)
@@ -2323,7 +2322,7 @@ static void skge_phy_reset(struct skge_p
netif_stop_queue(skge->netdev);
netif_carrier_off(skge->netdev);
- mutex_lock(&hw->phy_mutex);
+ spin_lock_bh(&skge->phy_lock);
if (hw->chip_id == CHIP_ID_GENESIS) {
genesis_reset(hw, port);
genesis_mac_init(hw, port);
@@ -2331,7 +2330,7 @@ static void skge_phy_reset(struct skge_p
yukon_reset(hw, port);
yukon_init(hw, port);
}
- mutex_unlock(&hw->phy_mutex);
+ spin_unlock_bh(&skge->phy_lock);
dev->set_multicast_list(dev);
}
@@ -2354,12 +2353,12 @@ static int skge_ioctl(struct net_device
/* fallthru */
case SIOCGMIIREG: {
u16 val = 0;
- mutex_lock(&hw->phy_mutex);
+ spin_lock_bh(&skge->phy_lock);
if (hw->chip_id == CHIP_ID_GENESIS)
err = __xm_phy_read(hw, skge->port, data->reg_num & 0x1f, &val);
else
err = __gm_phy_read(hw, skge->port, data->reg_num & 0x1f, &val);
- mutex_unlock(&hw->phy_mutex);
+ spin_unlock_bh(&skge->phy_lock);
data->val_out = val;
break;
}
@@ -2368,14 +2367,14 @@ static int skge_ioctl(struct net_device
if (!capable(CAP_NET_ADMIN))
return -EPERM;
- mutex_lock(&hw->phy_mutex);
+ spin_lock_bh(&skge->phy_lock);
if (hw->chip_id == CHIP_ID_GENESIS)
err = xm_phy_write(hw, skge->port, data->reg_num & 0x1f,
data->val_in);
else
err = gm_phy_write(hw, skge->port, data->reg_num & 0x1f,
data->val_in);
- mutex_unlock(&hw->phy_mutex);
+ spin_unlock_bh(&skge->phy_lock);
break;
}
return err;
@@ -2481,12 +2480,12 @@ static int skge_up(struct net_device *de
goto free_rx_ring;
/* Initialize MAC */
- mutex_lock(&hw->phy_mutex);
+ spin_lock_bh(&skge->phy_lock);
if (hw->chip_id == CHIP_ID_GENESIS)
genesis_mac_init(hw, port);
else
yukon_mac_init(hw, port);
- mutex_unlock(&hw->phy_mutex);
+ spin_unlock_bh(&skge->phy_lock);
/* Configure RAMbuffers */
chunk = hw->ram_size / ((hw->ports + 1)*2);
@@ -2531,7 +2530,7 @@ static int skge_down(struct net_device *
netif_stop_queue(dev);
if (hw->chip_id == CHIP_ID_GENESIS && hw->phy_type == SK_PHY_XMAC)
- cancel_delayed_work(&skge->link_thread);
+ del_timer_sync(&skge->link_timer);
skge_write8(skge->hw, SK_REG(skge->port, LNK_LED_REG), LED_OFF);
if (hw->chip_id == CHIP_ID_GENESIS)
@@ -3160,28 +3159,29 @@ static void skge_error_irq(struct skge_h
}
/*
- * Interrupt from PHY are handled in work queue
+ * Interrupt from PHY are handled in tasklet (softirq)
* because accessing phy registers requires spin wait which might
* cause excess interrupt latency.
*/
-static void skge_extirq(struct work_struct *work)
+static void skge_extirq(unsigned long arg)
{
- struct skge_hw *hw = container_of(work, struct skge_hw, phy_work);
+ struct skge_hw *hw = (struct skge_hw *) arg;
int port;
- mutex_lock(&hw->phy_mutex);
for (port = 0; port < hw->ports; port++) {
struct net_device *dev = hw->dev[port];
- struct skge_port *skge = netdev_priv(dev);
if (netif_running(dev)) {
+ struct skge_port *skge = netdev_priv(dev);
+
+ spin_lock(&skge->phy_lock);
if (hw->chip_id != CHIP_ID_GENESIS)
yukon_phy_intr(skge);
else if (hw->phy_type == SK_PHY_BCOM)
bcom_phy_intr(skge);
+ spin_unlock(&skge->phy_lock);
}
}
- mutex_unlock(&hw->phy_mutex);
spin_lock_irq(&hw->hw_lock);
hw->intr_mask |= IS_EXT_REG;
@@ -3206,7 +3206,7 @@ static irqreturn_t skge_intr(int irq, vo
status &= hw->intr_mask;
if (status & IS_EXT_REG) {
hw->intr_mask &= ~IS_EXT_REG;
- schedule_work(&hw->phy_work);
+ tasklet_schedule(&hw->ext_task);
}
if (status & (IS_XA1_F|IS_R1_F)) {
@@ -3484,14 +3484,12 @@ static int skge_reset(struct skge_hw *hw
skge_write32(hw, B0_IMSK, hw->intr_mask);
- mutex_lock(&hw->phy_mutex);
for (i = 0; i < hw->ports; i++) {
if (hw->chip_id == CHIP_ID_GENESIS)
genesis_reset(hw, i);
else
yukon_reset(hw, i);
}
- mutex_unlock(&hw->phy_mutex);
return 0;
}
@@ -3539,6 +3537,8 @@ static struct net_device *skge_devinit(s
skge->netdev = dev;
skge->hw = hw;
skge->msg_enable = netif_msg_init(debug, default_msg);
+ spin_lock_init(&skge->phy_lock);
+
skge->tx_ring.count = DEFAULT_TX_RING_SIZE;
skge->rx_ring.count = DEFAULT_RX_RING_SIZE;
@@ -3555,7 +3555,7 @@ static struct net_device *skge_devinit(s
skge->port = port;
/* Only used for Genesis XMAC */
- INIT_DELAYED_WORK(&skge->link_thread, xm_link_timer);
+ setup_timer(&skge->link_timer, xm_link_timer, (unsigned long) skge);
if (hw->chip_id != CHIP_ID_GENESIS) {
dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
@@ -3637,9 +3637,8 @@ static int __devinit skge_probe(struct p
}
hw->pdev = pdev;
- mutex_init(&hw->phy_mutex);
- INIT_WORK(&hw->phy_work, skge_extirq);
spin_lock_init(&hw->hw_lock);
+ tasklet_init(&hw->ext_task, &skge_extirq, (unsigned long) hw);
hw->regs = ioremap_nocache(pci_resource_start(pdev, 0), 0x4000);
if (!hw->regs) {
@@ -3725,6 +3724,8 @@ static void __devexit skge_remove(struct
dev0 = hw->dev[0];
unregister_netdev(dev0);
+ tasklet_disable(&hw->ext_task);
+
spin_lock_irq(&hw->hw_lock);
hw->intr_mask = 0;
skge_write32(hw, B0_IMSK, 0);
--- test.orig/drivers/net/skge.h
+++ test/drivers/net/skge.h
@@ -2412,6 +2412,7 @@ struct skge_hw {
void __iomem *regs;
struct pci_dev *pdev;
spinlock_t hw_lock;
+ struct tasklet_struct ext_task;
u32 intr_mask;
struct net_device *dev[2];
@@ -2424,8 +2425,6 @@ struct skge_hw {
u32 ram_size;
u32 ram_offset;
u16 phy_addr;
- struct work_struct phy_work;
- struct mutex phy_mutex;
};
enum pause_control {
@@ -2447,17 +2446,18 @@ enum pause_status {
struct skge_port {
- u32 msg_enable;
struct skge_hw *hw;
struct net_device *netdev;
int port;
+ u32 msg_enable;
+ spinlock_t phy_lock;
struct skge_ring tx_ring;
struct skge_ring rx_ring;
struct net_device_stats net_stats;
- struct delayed_work link_thread;
+ struct timer_list link_timer;
enum pause_control flow_control;
enum pause_status flow_status;
u8 rx_csum;
-
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