* [PATCH] jme: netpoll support
@ 2012-07-17 16:29 Lekensteyn
2012-07-18 16:45 ` David Miller
0 siblings, 1 reply; 5+ messages in thread
From: Lekensteyn @ 2012-07-17 16:29 UTC (permalink / raw)
To: Guo-Fu Tseng; +Cc: netdev
From: Peter Wu <lekensteyn@gmail.com>
This patch adds the netpoll function to support netconsole. Tested and works
fine on my "JMC250 PCI Express Gigabit Ethernet Controller" (PCI ID 0250).
Signed-off-by: Peter Wu <lekensteyn@gmail.com>
---
drivers/net/ethernet/jme.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/net/ethernet/jme.c b/drivers/net/ethernet/jme.c
index 4ea6580..c911d88 100644
--- a/drivers/net/ethernet/jme.c
+++ b/drivers/net/ethernet/jme.c
@@ -2743,6 +2743,17 @@ jme_set_features(struct net_device *netdev, netdev_features_t features)
return 0;
}
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void jme_netpoll(struct net_device *dev)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ jme_intr(dev->irq, dev);
+ local_irq_restore(flags);
+}
+#endif
+
static int
jme_nway_reset(struct net_device *netdev)
{
@@ -2944,6 +2955,9 @@ static const struct net_device_ops jme_netdev_ops = {
.ndo_tx_timeout = jme_tx_timeout,
.ndo_fix_features = jme_fix_features,
.ndo_set_features = jme_set_features,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = jme_netpoll,
+#endif
};
static int __devinit
--
1.7.9.5
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] jme: netpoll support
2012-07-17 16:29 [PATCH] jme: netpoll support Lekensteyn
@ 2012-07-18 16:45 ` David Miller
2012-07-19 2:00 ` Guo-Fu Tseng
0 siblings, 1 reply; 5+ messages in thread
From: David Miller @ 2012-07-18 16:45 UTC (permalink / raw)
To: lekensteyn; +Cc: cooldavid, netdev
From: Lekensteyn <lekensteyn@gmail.com>
Date: Tue, 17 Jul 2012 18:29:34 +0200
> From: Peter Wu <lekensteyn@gmail.com>
>
> This patch adds the netpoll function to support netconsole. Tested and works
> fine on my "JMC250 PCI Express Gigabit Ethernet Controller" (PCI ID 0250).
>
> Signed-off-by: Peter Wu <lekensteyn@gmail.com>
Applied to net-next
I really wonder if this driver works on SMP systems at all.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] jme: netpoll support
2012-07-18 16:45 ` David Miller
@ 2012-07-19 2:00 ` Guo-Fu Tseng
2012-07-19 3:24 ` David Miller
0 siblings, 1 reply; 5+ messages in thread
From: Guo-Fu Tseng @ 2012-07-19 2:00 UTC (permalink / raw)
To: David Miller, lekensteyn; +Cc: netdev
On Wed, 18 Jul 2012 09:45:24 -0700 (PDT), David Miller wrote
> From: Lekensteyn <lekensteyn@gmail.com>
> Date: Tue, 17 Jul 2012 18:29:34 +0200
>
> > From: Peter Wu <lekensteyn@gmail.com>
> >
> > This patch adds the netpoll function to support netconsole. Tested and works
> > fine on my "JMC250 PCI Express Gigabit Ethernet Controller" (PCI ID 0250).
> >
> > Signed-off-by: Peter Wu <lekensteyn@gmail.com>
>
> Applied to net-next
>
> I really wonder if this driver works on SMP systems at all.
Hi davem:
I wrote/tested this driver on SMP system at very beginning.
In face some of the design was aimed for SMP systems.
Is there any obvious bug or something I should be aware of?
Guo-Fu Tseng
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] jme: netpoll support
2012-07-19 2:00 ` Guo-Fu Tseng
@ 2012-07-19 3:24 ` David Miller
2012-07-19 4:08 ` Ben Hutchings
0 siblings, 1 reply; 5+ messages in thread
From: David Miller @ 2012-07-19 3:24 UTC (permalink / raw)
To: cooldavid; +Cc: lekensteyn, netdev
From: "Guo-Fu Tseng" <cooldavid@cooldavid.org>
Date: Thu, 19 Jul 2012 10:00:10 +0800
> On Wed, 18 Jul 2012 09:45:24 -0700 (PDT), David Miller wrote
>> From: Lekensteyn <lekensteyn@gmail.com>
>> Date: Tue, 17 Jul 2012 18:29:34 +0200
>>
>> > From: Peter Wu <lekensteyn@gmail.com>
>> >
>> > This patch adds the netpoll function to support netconsole. Tested and works
>> > fine on my "JMC250 PCI Express Gigabit Ethernet Controller" (PCI ID 0250).
>> >
>> > Signed-off-by: Peter Wu <lekensteyn@gmail.com>
>>
>> Applied to net-next
>>
>> I really wonder if this driver works on SMP systems at all.
> Hi davem:
>
> I wrote/tested this driver on SMP system at very beginning.
> In face some of the design was aimed for SMP systems.
> Is there any obvious bug or something I should be aware of?
Well, you do no locking in your IRQ handler.
So how can you be sure in jme_free_irq() during jme_close() that the
handler is not running on some cpu somewhere?
That's why drivers like drivers/net/ethernet/broadcom/tg3.c have
a function like tg3_irq_quiesce(), to guarentee that no code path
is executing in the interrupt handler.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] jme: netpoll support
2012-07-19 3:24 ` David Miller
@ 2012-07-19 4:08 ` Ben Hutchings
0 siblings, 0 replies; 5+ messages in thread
From: Ben Hutchings @ 2012-07-19 4:08 UTC (permalink / raw)
To: David Miller; +Cc: cooldavid, lekensteyn, netdev
On Wed, 2012-07-18 at 20:24 -0700, David Miller wrote:
> From: "Guo-Fu Tseng" <cooldavid@cooldavid.org>
> Date: Thu, 19 Jul 2012 10:00:10 +0800
>
> > On Wed, 18 Jul 2012 09:45:24 -0700 (PDT), David Miller wrote
> >> From: Lekensteyn <lekensteyn@gmail.com>
> >> Date: Tue, 17 Jul 2012 18:29:34 +0200
> >>
> >> > From: Peter Wu <lekensteyn@gmail.com>
> >> >
> >> > This patch adds the netpoll function to support netconsole. Tested and works
> >> > fine on my "JMC250 PCI Express Gigabit Ethernet Controller" (PCI ID 0250).
> >> >
> >> > Signed-off-by: Peter Wu <lekensteyn@gmail.com>
> >>
> >> Applied to net-next
> >>
> >> I really wonder if this driver works on SMP systems at all.
> > Hi davem:
> >
> > I wrote/tested this driver on SMP system at very beginning.
> > In face some of the design was aimed for SMP systems.
> > Is there any obvious bug or something I should be aware of?
>
> Well, you do no locking in your IRQ handler.
>
> So how can you be sure in jme_free_irq() during jme_close() that the
> handler is not running on some cpu somewhere?
>
> That's why drivers like drivers/net/ethernet/broadcom/tg3.c have
> a function like tg3_irq_quiesce(), to guarentee that no code path
> is executing in the interrupt handler.
What on earth are you talking about? You can never be sure of that with
shared IRQ handlers; so free_irq() wait if necessary.
Ben.
--
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2012-07-19 4:08 UTC | newest]
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2012-07-17 16:29 [PATCH] jme: netpoll support Lekensteyn
2012-07-18 16:45 ` David Miller
2012-07-19 2:00 ` Guo-Fu Tseng
2012-07-19 3:24 ` David Miller
2012-07-19 4:08 ` Ben Hutchings
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