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Message-ID: <d856540b-bacc-45e3-a7cc-49e7febafb95@CMEXHTCAS1.ad.emulex.com>
Date: Wed, 28 Nov 2012 11:20:02 +0530
From: Sathya Perla <sathya.perla@...lex.com>
To: <netdev@...r.kernel.org>
CC: Sathya Perla <sathya.perla@...lex.com>
Subject: [PATCH net-next] be2net: fix INTx ISR for interrupt behaviour on BE2
On BE2 chip, an interrupt may be raised even when EQ is in un-armed state.
As a result be_intx()::events_get() and be_poll:events_get() can race and
notify an EQ wrongly.
Fix this by counting events only in be_poll(). Commit 0b545a629 fixes
the same issue in the MSI-x path.
But, on Lancer, INTx can be de-asserted only by notifying num evts. This
is not an issue as the above BE2 behavior doesn't exist/has never been
seen on Lancer.
Signed-off-by: Sathya Perla <sathya.perla@...lex.com>
---
drivers/net/ethernet/emulex/benet/be_main.c | 54 +++++++++++---------------
1 files changed, 23 insertions(+), 31 deletions(-)
diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index adef536..0661e93 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -1675,24 +1675,6 @@ static inline int events_get(struct be_eq_obj *eqo)
return num;
}
-static int event_handle(struct be_eq_obj *eqo)
-{
- bool rearm = false;
- int num = events_get(eqo);
-
- /* Deal with any spurious interrupts that come without events */
- if (!num)
- rearm = true;
-
- if (num || msix_enabled(eqo->adapter))
- be_eq_notify(eqo->adapter, eqo->q.id, rearm, true, num);
-
- if (num)
- napi_schedule(&eqo->napi);
-
- return num;
-}
-
/* Leaves the EQ is disarmed state */
static void be_eq_clean(struct be_eq_obj *eqo)
{
@@ -2014,15 +1996,23 @@ static int be_rx_cqs_create(struct be_adapter *adapter)
static irqreturn_t be_intx(int irq, void *dev)
{
- struct be_adapter *adapter = dev;
- int num_evts;
+ struct be_eq_obj *eqo = dev;
+ struct be_adapter *adapter = eqo->adapter;
+ int num_evts = 0;
- /* With INTx only one EQ is used */
- num_evts = event_handle(&adapter->eq_obj[0]);
- if (num_evts)
- return IRQ_HANDLED;
- else
- return IRQ_NONE;
+ /* On Lancer, clear-intr bit of the EQ DB does not work.
+ * INTx is de-asserted only on notifying num evts.
+ */
+ if (lancer_chip(adapter))
+ num_evts = events_get(eqo);
+
+ /* The EQ-notify may not de-assert INTx rightaway, causing
+ * the ISR to be invoked again. So, return HANDLED even when
+ * num_evts is zero.
+ */
+ be_eq_notify(adapter, eqo->q.id, false, true, num_evts);
+ napi_schedule(&eqo->napi);
+ return IRQ_HANDLED;
}
static irqreturn_t be_msix(int irq, void *dev)
@@ -2342,10 +2332,10 @@ static int be_irq_register(struct be_adapter *adapter)
return status;
}
- /* INTx */
+ /* INTx: only the first EQ is used */
netdev->irq = adapter->pdev->irq;
status = request_irq(netdev->irq, be_intx, IRQF_SHARED, netdev->name,
- adapter);
+ &adapter->eq_obj[0]);
if (status) {
dev_err(&adapter->pdev->dev,
"INTx request IRQ failed - err %d\n", status);
@@ -2367,7 +2357,7 @@ static void be_irq_unregister(struct be_adapter *adapter)
/* INTx */
if (!msix_enabled(adapter)) {
- free_irq(netdev->irq, adapter);
+ free_irq(netdev->irq, &adapter->eq_obj[0]);
goto done;
}
@@ -3023,8 +3013,10 @@ static void be_netpoll(struct net_device *netdev)
struct be_eq_obj *eqo;
int i;
- for_all_evt_queues(adapter, eqo, i)
- event_handle(eqo);
+ for_all_evt_queues(adapter, eqo, i) {
+ be_eq_notify(eqo->adapter, eqo->q.id, false, true, 0);
+ napi_schedule(&eqo->napi);
+ }
return;
}
--
1.7.1
--
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