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Staging: sxg: Add watchdog timer for managing Link states for SXG driver

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Add a watchdog timer to take care of link change notifications.
Link changes would now be handled asynchronously as they involve large delays.

Signed-off-by: LinSysSoft Sahara Team <saharaproj@linsyssoft.com>
Signed-off-by: Mithlesh Thukral <mithlesh@linsyssoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Mithlesh Thukral 2009-03-20 17:37:32 +05:30 committed by Greg Kroah-Hartman
parent 524ca9c196
commit e5ea8da06b
2 changed files with 60 additions and 17 deletions
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74
drivers/staging/sxg/sxg.c
View file

@ -136,6 +136,9 @@ static int sxg_register_interrupt(struct adapter_t *adapter);
static void sxg_remove_isr(struct adapter_t *adapter);
static irqreturn_t sxg_isr(int irq, void *dev_id);
static void sxg_watchdog(unsigned long data);
static void sxg_update_link_status (struct work_struct *work);
#define XXXTODO 0
#if XXXTODO
@ -1122,6 +1125,12 @@ static int sxg_entry_probe(struct pci_dev *pcidev,
netif_napi_add(netdev, &adapter->napi,
sxg_poll, SXG_NETDEV_WEIGHT);
netdev->watchdog_timeo = 2 * HZ;
init_timer(&adapter->watchdog_timer);
adapter->watchdog_timer.function = &sxg_watchdog;
adapter->watchdog_timer.data = (unsigned long) adapter;
INIT_WORK(&adapter->update_link_status, sxg_update_link_status);
DBG_ERROR
("sxg: %s addr 0x%lx, irq %d, MAC addr \
%02X:%02X:%02X:%02X:%02X:%02X\n",
@ -1441,7 +1450,10 @@ static int sxg_process_isr(struct adapter_t *adapter, u32 MessageId)
}
/* Link event */
if (Isr & SXG_ISR_LINK) {
sxg_link_event(adapter);
if (adapter->state != ADAPT_DOWN) {
adapter->link_status_changed = 1;
schedule_work(&adapter->update_link_status);
}
}
/* Debug - breakpoint hit */
if (Isr & SXG_ISR_BREAK) {
@ -2260,6 +2272,7 @@ int sxg_second_open(struct net_device * dev)
sxg_register_intr(adapter);
spin_unlock_irqrestore(&sxg_global.driver_lock, sxg_global.flags);
mod_timer(&adapter->watchdog_timer, jiffies);
return (STATUS_SUCCESS);
}
@ -2312,27 +2325,28 @@ static int sxg_entry_halt(struct net_device *dev)
RssIds = SXG_RSS_CPU_COUNT(adapter);
IsrCount = adapter->msi_enabled ? RssIds : 1;
napi_disable(&adapter->napi);
/* Disable interrupts */
spin_lock_irqsave(&sxg_global.driver_lock, sxg_global.flags);
DBG_ERROR("sxg: %s (%s) ENTER\n", __func__, dev->name);
WRITE_REG(adapter->UcodeRegs[0].RcvCmd, 0, true);
netif_stop_queue(adapter->netdev);
SXG_DISABLE_ALL_INTERRUPTS(adapter);
adapter->state = ADAPT_DOWN;
adapter->linkstate = LINK_DOWN;
spin_unlock_irqrestore(&sxg_global.driver_lock, sxg_global.flags);
sxg_deregister_interrupt(adapter);
WRITE_REG(HwRegs->Reset, 0xDEAD, FLUSH);
mdelay(5000);
del_timer_sync(&adapter->watchdog_timer);
netif_stop_queue(dev);
netif_carrier_off(dev);
napi_disable(&adapter->napi);
WRITE_REG(adapter->UcodeRegs[0].RcvCmd, 0, true);
adapter->devflags_prev = 0;
DBG_ERROR("sxg: %s (%s) set adapter[%p] state to ADAPT_DOWN(%d)\n",
__func__, dev->name, adapter, adapter->state);
/* Disable interrupts */
SXG_DISABLE_ALL_INTERRUPTS(adapter);
spin_unlock_irqrestore(&sxg_global.driver_lock, sxg_global.flags);
sxg_deregister_interrupt(adapter);
WRITE_REG(HwRegs->Reset, 0xDEAD, FLUSH);
mdelay(5000);
spin_lock(&adapter->RcvQLock);
/* Free all the blocks and the buffers, moved from remove() routine */
if (!(IsListEmpty(&adapter->AllRcvBlocks))) {
@ -3013,6 +3027,8 @@ static void sxg_link_event(struct adapter_t *adapter)
int status;
u32 Value;
if (adapter->state == ADAPT_DOWN)
return;
SXG_TRACE(TRACE_SXG, SxgTraceBuffer, TRACE_NOISY, "LinkEvnt",
adapter, 0, 0, 0);
DBG_ERROR("ENTER %s\n", __func__);
@ -3053,10 +3069,13 @@ static void sxg_link_event(struct adapter_t *adapter)
sxg_link_state(adapter, LinkState);
DBG_ERROR("SXG: Link Alarm occurred. Link is %s\n",
((LinkState == SXG_LINK_UP) ? "UP" : "DOWN"));
if (LinkState == SXG_LINK_UP)
if (LinkState == SXG_LINK_UP) {
netif_carrier_on(netdev);
else
netif_tx_start_all_queues(netdev);
} else {
netif_tx_stop_all_queues(netdev);
netif_carrier_off(netdev);
}
} else {
/*
* XXXTODO - Assuming Link Attention is only being generated
@ -4435,6 +4454,27 @@ static struct net_device_stats *sxg_get_stats(struct net_device * dev)
return (&adapter->stats);
}
static void sxg_watchdog(unsigned long data)
{
struct adapter_t *adapter = (struct adapter_t *) data;
if (adapter->state != ADAPT_DOWN) {
sxg_link_event(adapter);
/* Reset the timer */
mod_timer(&adapter->watchdog_timer, round_jiffies(jiffies + 2 * HZ));
}
}
static void sxg_update_link_status (struct work_struct *work)
{
struct adapter_t *adapter = (struct adapter_t *)container_of
(work, struct adapter_t, update_link_status);
if (likely(adapter->link_status_changed)) {
sxg_link_event(adapter);
adapter->link_status_changed = 0;
}
}
static struct pci_driver sxg_driver = {
.name = sxg_driver_name,
.id_table = sxg_pci_tbl,

3
drivers/staging/sxg/sxg.h
View file

@ -715,6 +715,9 @@ struct adapter_t {
/*MSI-X related data elements*/
u32 nr_msix_entries;
struct msix_entry *msi_entries;
struct timer_list watchdog_timer;
struct work_struct update_link_status;
u32 link_status_changed;
};
#if SLIC_DUMP_ENABLED