netdev - Re: [PATCH] [e1000] Lower the MSI unavailable message to INFO priority

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Date:	Thu, 17 May 2007 14:29:15 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	Chuck Ebbert <cebbert@...hat.com>
CC:	Jeff Garzik <jeff@...zik.org>, "H. Peter Anvin" <hpa@...or.com>,
	e1000-devel@...ts.sourceforge.net, john.ronciak@...el.com,
	jesse.brandeburg@...el.com, jeffrey.t.kirsher@...el.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] [e1000] Lower the MSI unavailable message to INFO priority

Chuck Ebbert wrote:
> Kok, Auke wrote:
>> Jeff Garzik wrote:
>>> H. Peter Anvin wrote:
>>>> diff --git a/drivers/net/e1000/e1000_main.c
>>>> b/drivers/net/e1000/e1000_main.c
>>>> index 637ae8f..089ae3f 100644
>>>> --- a/drivers/net/e1000/e1000_main.c
>>>> +++ b/drivers/net/e1000/e1000_main.c
>>>> @@ -307,7 +307,7 @@ static int e1000_request_irq(struct e1000_adapter
>>>> *adapter)
>>>>      if (adapter->hw.mac_type >= e1000_82571) {
>>>>          adapter->have_msi = TRUE;
>>>>          if ((err = pci_enable_msi(adapter->pdev))) {
>>>> -            DPRINTK(PROBE, ERR,
>>>> +            DPRINTK(PROBE, INFO,
>>>>               "Unable to allocate MSI interrupt Error: %d\n", err);
>>>>              adapter->have_msi = FALSE;
>>>
>>> Actually, it should not print any message at all.
>>>
>>> pci_enable_msi() failure is a normal event (as you point out).  Even
>>> at KERN_INFO level, the message is still misleading.
>> I've been reworking some of this code and there is even a
>> pci_disable_msi() missing in case pci_request_irq failed. I'll post a
>> patch to clean it up in a second.
> 
> It seems ixgb needs this too (the message removal at least?)

yes, I'll get there once I get a chance to get some e1000 work near completion 
first. I don't think that for ixgb this is as big of a deal for now. If MSI is 
breaking with a 10gig adapter I think people appreciate the error.

We do have to make sure that the PCI subsystem throws errors in the case it is 
justified, like when we're out of vectors, or something really bad happens 
(perhaps suspend/resumish). I assume that is the case, but I haven't checked.

Cheers,

Auke
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