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Subject[PATCH 5/5] forcedeth: timer overhaul

commit d7c766113ee2ec66ae8975e0acbad086d2c23594
Author: Jeff Garzik <jeff@garzik.org>
Date: Sat Oct 6 10:57:56 2007 -0400

[netdrvr] forcedeth: timer overhaul

* convert stats_poll timer to a delayed-work workqueue stats_task

* protect hw stats update with a lock

* now that recovery is the only remaining use of nv_do_nic_poll(),
rename it to nv_reset_task(), move it from a timer to a workqueue,
and delete all non-recovery-related code from the function.

* kill np->in_shutdown, it mirrors netif_running(). furthermore,
the overwhelming majority of sites that tested np->in_shutdown
were inside rtnl_lock() and guaranteed never to race against shutdown
anyway.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/net/forcedeth.c | 194 ++++++++++++++++++------------------------------
1 file changed, 75 insertions(+), 119 deletions(-)
d7c766113ee2ec66ae8975e0acbad086d2c23594
diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index d6eacd7..a037f49 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -62,6 +62,7 @@
#include <linux/init.h>
#include <linux/if_vlan.h>
#include <linux/dma-mapping.h>
+#include <linux/workqueue.h>

#include <asm/irq.h>
#include <asm/io.h>
@@ -450,7 +451,6 @@ union ring_type {
#define NV_PKTLIMIT_2 9100 /* Actual limit according to NVidia: 9202 */

#define OOM_REFILL (1+HZ/20)
-#define POLL_WAIT (1+HZ/100)
#define LINK_TIMEOUT (3*HZ)
#define STATS_INTERVAL (10*HZ)

@@ -670,7 +670,6 @@ struct fe_priv {
* Locking: spin_lock(&np->lock); */
struct net_device_stats stats;
struct nv_ethtool_stats estats;
- int in_shutdown;
u32 linkspeed;
int duplex;
int autoneg;
@@ -681,7 +680,6 @@ struct fe_priv {
unsigned int phy_model;
u16 gigabit;
int intr_test;
- int recover_error;

/* General data: RO fields */
dma_addr_t ring_addr;
@@ -710,9 +708,9 @@ struct fe_priv {
unsigned int rx_buf_sz;
unsigned int pkt_limit;
struct timer_list oom_kick;
- struct timer_list nic_poll;
- struct timer_list stats_poll;
- u32 nic_poll_irq;
+ struct work_struct reset_task;
+ struct delayed_work stats_task;
+ u32 reset_task_irq;
int rx_ring_size;

/* media detection workaround.
@@ -1388,7 +1386,7 @@ static void nv_mac_reset(struct net_device *dev)
pci_push(base);
}

-static void nv_get_hw_stats(struct net_device *dev)
+static void __nv_get_hw_stats(struct net_device *dev)
{
struct fe_priv *np = netdev_priv(dev);
u8 __iomem *base = get_hwbase(dev);
@@ -1443,6 +1441,16 @@ static void nv_get_hw_stats(struct net_device *dev)
}
}

+static void nv_get_hw_stats(struct net_device *dev)
+{
+ struct fe_priv *np = netdev_priv(dev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&np->lock, flags);
+ __nv_get_hw_stats(dev);
+ spin_unlock_irqrestore(&np->lock, flags);
+}
+
/*
* nv_get_stats: dev->get_stats function
* Get latest stats value from the nic.
@@ -2478,10 +2486,9 @@ static int nv_change_mtu(struct net_device *dev, int new_mtu)
nv_drain_txrx(dev);
/* reinit driver view of the rx queue */
set_bufsize(dev);
- if (nv_init_ring(dev)) {
- if (!np->in_shutdown)
- mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
- }
+ if (nv_init_ring(dev))
+ mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
+
/* reinit nic view of the rx queue */
writel(np->rx_buf_sz, base + NvRegOffloadConfig);
setup_hw_rings(dev, NV_SETUP_RX_RING | NV_SETUP_TX_RING);
@@ -2957,10 +2964,9 @@ static irqreturn_t __nv_nic_irq(struct net_device *dev, bool optimized)
writel(np->irqmask, base + NvRegIrqMask);
pci_push(base);

- if (!np->in_shutdown) {
- np->nic_poll_irq = np->irqmask;
- np->recover_error = 1;
- mod_timer(&np->nic_poll, jiffies + POLL_WAIT);
+ if (netif_running(dev)) {
+ np->reset_task_irq = np->irqmask;
+ schedule_work(&np->reset_task);
}
}

@@ -3061,8 +3067,7 @@ static int nv_napi_poll(struct napi_struct *napi, int budget)

if (retcode) {
spin_lock_irqsave(&np->lock, flags);
- if (!np->in_shutdown)
- mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
+ mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
spin_unlock_irqrestore(&np->lock, flags);
}

@@ -3276,12 +3281,12 @@ static void nv_free_irq(struct net_device *dev)
}
}

-static void nv_do_nic_poll(unsigned long data)
+static void nv_reset_task(struct work_struct *work)
{
- struct net_device *dev = (struct net_device *) data;
- struct fe_priv *np = netdev_priv(dev);
+ struct fe_priv *np = container_of(work, struct fe_priv, reset_task);
+ struct net_device *dev = np->dev;
u8 __iomem *base = get_hwbase(dev);
- u32 mask = 0;
+ u32 mask;

/*
* First disable irq(s) and then
@@ -3290,88 +3295,51 @@ static void nv_do_nic_poll(unsigned long data)
*/

if (!using_multi_irqs(dev)) {
- if (np->msi_flags & NV_MSI_X_ENABLED)
- disable_irq_lockdep(np->msi_x_entry[NV_MSI_X_VECTOR_ALL].vector);
- else
- disable_irq_lockdep(dev->irq);
mask = np->irqmask;
} else {
- if (np->nic_poll_irq & NVREG_IRQ_RX_ALL) {
- disable_irq_lockdep(np->msi_x_entry[NV_MSI_X_VECTOR_RX].vector);
+ mask = 0;
+ if (np->reset_task_irq & NVREG_IRQ_RX_ALL)
mask |= NVREG_IRQ_RX_ALL;
- }
- if (np->nic_poll_irq & NVREG_IRQ_TX_ALL) {
- disable_irq_lockdep(np->msi_x_entry[NV_MSI_X_VECTOR_TX].vector);
+ if (np->reset_task_irq & NVREG_IRQ_TX_ALL)
mask |= NVREG_IRQ_TX_ALL;
- }
- if (np->nic_poll_irq & NVREG_IRQ_OTHER) {
- disable_irq_lockdep(np->msi_x_entry[NV_MSI_X_VECTOR_OTHER].vector);
+ if (np->reset_task_irq & NVREG_IRQ_OTHER)
mask |= NVREG_IRQ_OTHER;
- }
}
- np->nic_poll_irq = 0;
+ np->reset_task_irq = 0;

- if (np->recover_error) {
- np->recover_error = 0;
- printk(KERN_INFO "forcedeth: MAC in recoverable error state\n");
- if (netif_running(dev)) {
- netif_tx_lock_bh(dev);
- spin_lock(&np->lock);
- /* stop engines */
- nv_stop_txrx(dev);
- nv_txrx_reset(dev);
- /* drain rx queue */
- nv_drain_txrx(dev);
- /* reinit driver view of the rx queue */
- set_bufsize(dev);
- if (nv_init_ring(dev)) {
- if (!np->in_shutdown)
- mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
- }
- /* reinit nic view of the rx queue */
- writel(np->rx_buf_sz, base + NvRegOffloadConfig);
- setup_hw_rings(dev, NV_SETUP_RX_RING | NV_SETUP_TX_RING);
- writel( ((np->rx_ring_size-1) << NVREG_RINGSZ_RXSHIFT) + ((np->tx_ring_size-1) << NVREG_RINGSZ_TXSHIFT),
- base + NvRegRingSizes);
- pci_push(base);
- writel(NVREG_TXRXCTL_KICK|np->txrxctl_bits, get_hwbase(dev) + NvRegTxRxControl);
- pci_push(base);
+ printk(KERN_INFO "forcedeth: MAC in recoverable error state\n");
+ if (!netif_running(dev))
+ goto out;

- /* restart rx engine */
- nv_start_txrx(dev);
- spin_unlock(&np->lock);
- netif_tx_unlock_bh(dev);
- }
- }
+ netif_tx_lock_bh(dev);
+ spin_lock(&np->lock);
+ /* stop engines */
+ nv_stop_txrx(dev);
+ nv_txrx_reset(dev);
+ /* drain rx queue */
+ nv_drain_txrx(dev);
+ /* reinit driver view of the rx queue */
+ set_bufsize(dev);
+ if (nv_init_ring(dev))
+ mod_timer(&np->oom_kick, jiffies + OOM_REFILL);

- /* FIXME: Do we need synchronize_irq(dev->irq) here? */
+ /* reinit nic view of the rx queue */
+ writel(np->rx_buf_sz, base + NvRegOffloadConfig);
+ setup_hw_rings(dev, NV_SETUP_RX_RING | NV_SETUP_TX_RING);
+ writel( ((np->rx_ring_size-1) << NVREG_RINGSZ_RXSHIFT) + ((np->tx_ring_size-1) << NVREG_RINGSZ_TXSHIFT),
+ base + NvRegRingSizes);
+ pci_push(base);
+ writel(NVREG_TXRXCTL_KICK|np->txrxctl_bits, get_hwbase(dev) + NvRegTxRxControl);
+ pci_push(base);
+
+ /* restart rx engine */
+ nv_start_txrx(dev);
+ spin_unlock(&np->lock);
+ netif_tx_unlock_bh(dev);

+out:
writel(mask, base + NvRegIrqMask);
pci_push(base);
-
- if (!using_multi_irqs(dev)) {
- if (nv_optimized(np))
- nv_nic_irq_optimized(0, dev);
- else
- nv_nic_irq(0, dev);
- if (np->msi_flags & NV_MSI_X_ENABLED)
- enable_irq_lockdep(np->msi_x_entry[NV_MSI_X_VECTOR_ALL].vector);
- else
- enable_irq_lockdep(dev->irq);
- } else {
- if (np->nic_poll_irq & NVREG_IRQ_RX_ALL) {
- nv_nic_irq_rx(0, dev);
- enable_irq_lockdep(np->msi_x_entry[NV_MSI_X_VECTOR_RX].vector);
- }
- if (np->nic_poll_irq & NVREG_IRQ_TX_ALL) {
- nv_nic_irq_tx(0, dev);
- enable_irq_lockdep(np->msi_x_entry[NV_MSI_X_VECTOR_TX].vector);
- }
- if (np->nic_poll_irq & NVREG_IRQ_OTHER) {
- nv_nic_irq_other(0, dev);
- enable_irq_lockdep(np->msi_x_entry[NV_MSI_X_VECTOR_OTHER].vector);
- }
- }
}

#ifdef CONFIG_NET_POLL_CONTROLLER
@@ -3386,15 +3354,15 @@ static void nv_poll_controller(struct net_device *dev)
}
#endif

-static void nv_do_stats_poll(unsigned long data)
+static void nv_stats_task(struct work_struct *_work)
{
- struct net_device *dev = (struct net_device *) data;
- struct fe_priv *np = netdev_priv(dev);
+ struct delayed_work *work = (struct delayed_work *) _work;
+ struct fe_priv *np = container_of(work, struct fe_priv, stats_task);
+ struct net_device *dev = np->dev;

nv_get_hw_stats(dev);

- if (!np->in_shutdown)
- mod_timer(&np->stats_poll, jiffies + STATS_INTERVAL);
+ schedule_delayed_work(work, STATS_INTERVAL);
}

static void nv_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
@@ -3840,10 +3808,8 @@ static int nv_set_ringparam(struct net_device *dev, struct ethtool_ringparam* ri
if (netif_running(dev)) {
/* reinit driver view of the queues */
set_bufsize(dev);
- if (nv_init_ring(dev)) {
- if (!np->in_shutdown)
- mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
- }
+ if (nv_init_ring(dev))
+ mod_timer(&np->oom_kick, jiffies + OOM_REFILL);

/* reinit nic view of the queues */
writel(np->rx_buf_sz, base + NvRegOffloadConfig);
@@ -4024,7 +3990,7 @@ static void nv_get_ethtool_stats(struct net_device *dev, struct ethtool_stats *e
struct fe_priv *np = netdev_priv(dev);

/* update stats */
- nv_do_stats_poll((unsigned long)dev);
+ nv_get_hw_stats(dev);

memcpy(buffer, &np->estats, nv_get_sset_count(dev, ETH_SS_STATS)*sizeof(u64));
}
@@ -4322,10 +4288,9 @@ static void nv_self_test(struct net_device *dev, struct ethtool_test *test, u64
if (netif_running(dev)) {
/* reinit driver view of the rx queue */
set_bufsize(dev);
- if (nv_init_ring(dev)) {
- if (!np->in_shutdown)
- mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
- }
+ if (nv_init_ring(dev))
+ mod_timer(&np->oom_kick, jiffies + OOM_REFILL);
+
/* reinit nic view of the rx queue */
writel(np->rx_buf_sz, base + NvRegOffloadConfig);
setup_hw_rings(dev, NV_SETUP_RX_RING | NV_SETUP_TX_RING);
@@ -4473,8 +4438,6 @@ static int nv_open(struct net_device *dev)
nv_txrx_reset(dev);
writel(0, base + NvRegUnknownSetupReg6);

- np->in_shutdown = 0;
-
/* give hw rings */
setup_hw_rings(dev, NV_SETUP_RX_RING | NV_SETUP_TX_RING);
writel( ((np->rx_ring_size-1) << NVREG_RINGSZ_RXSHIFT) + ((np->tx_ring_size-1) << NVREG_RINGSZ_TXSHIFT),
@@ -4579,7 +4542,7 @@ static int nv_open(struct net_device *dev)

/* start statistics timer */
if (np->driver_data & (DEV_HAS_STATISTICS_V1|DEV_HAS_STATISTICS_V2))
- mod_timer(&np->stats_poll, jiffies + STATS_INTERVAL);
+ schedule_delayed_work(&np->stats_task, STATS_INTERVAL);

spin_unlock_irq(&np->lock);

@@ -4594,17 +4557,14 @@ static int nv_close(struct net_device *dev)
struct fe_priv *np = netdev_priv(dev);
u8 __iomem *base;

- spin_lock_irq(&np->lock);
- np->in_shutdown = 1;
- spin_unlock_irq(&np->lock);
netif_stop_queue(dev);
napi_disable(&np->napi);
napi_disable(&np->tx_napi);
synchronize_irq(dev->irq);

del_timer_sync(&np->oom_kick);
- del_timer_sync(&np->nic_poll);
- del_timer_sync(&np->stats_poll);
+ cancel_rearming_delayed_work(&np->stats_task);
+ cancel_work_sync(&np->reset_task);

spin_lock_irq(&np->lock);
nv_stop_txrx(dev);
@@ -4658,12 +4618,8 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
init_timer(&np->oom_kick);
np->oom_kick.data = (unsigned long) dev;
np->oom_kick.function = &nv_do_rx_refill; /* timer handler */
- init_timer(&np->nic_poll);
- np->nic_poll.data = (unsigned long) dev;
- np->nic_poll.function = &nv_do_nic_poll; /* timer handler */
- init_timer(&np->stats_poll);
- np->stats_poll.data = (unsigned long) dev;
- np->stats_poll.function = &nv_do_stats_poll; /* timer handler */
+ INIT_WORK(&np->reset_task, nv_reset_task);
+ INIT_DELAYED_WORK(&np->stats_task, nv_stats_task);

err = pci_enable_device(pci_dev);
if (err) {
-
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