From e5ea8da06ba610551a75c79c1467aae379e953ce Mon Sep 17 00:00:00 2001
From: Mithlesh Thukral <mithlesh@linsyssoft.com>
Date: Fri, 20 Mar 2009 17:37:32 +0530
Subject: [PATCH] Staging: sxg: Add watchdog timer for managing Link states for
SXG driver
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>
---
drivers/staging/sxg/sxg.c | 72 ++++++++++++++++++++++++++++++---------
drivers/staging/sxg/sxg.h | 3 ++
2 files changed, 59 insertions(+), 16 deletions(-)
diff --git a/drivers/staging/sxg/sxg.c b/drivers/staging/sxg/sxg.c
index c41dea0013bc..dbda031d4053 100644
--- a/drivers/staging/sxg/sxg.c
+++ b/drivers/staging/sxg/sxg.c
@@ -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;
- 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);
+
+ 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);
+
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,
diff --git a/drivers/staging/sxg/sxg.h b/drivers/staging/sxg/sxg.h
index 899cf1510f91..f07aa708d862 100644
--- a/drivers/staging/sxg/sxg.h
+++ b/drivers/staging/sxg/sxg.h
@@ -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
--
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