netdev - Re: [PATCH] cxgb4: fix probe when already with invalid parameters

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Message-ID: <532A1255.6060408@chelsio.com>
Date:	Wed, 19 Mar 2014 14:55:33 -0700
From:	Casey Leedom <leedom@...lsio.com>
To:	Dimitrios Michailidis <dm@...lsio.com>,
	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] cxgb4: fix probe when already with invalid parameters

   Yes, know what firmware version you're using is critical.  Thanks!

Casey

On 03/19/14 14:38, Dimitrios Michailidis wrote:
> Thadeu Lima de Souza Cascardo wrote:
>> Since commit 636f9d371f70f22961fd598fe18380057518ca31 ("cxgb4: Add
>> support for T4 configuration file"), we have problems when probing the
>> device, and finding out it's already initialized, but does not have
>> valid buffer sizes setup.
>>
>> This may happen with kexec without shutdown, or bad firmware or
>> bootloader.
>>
>> The usual symptom is that probe fails:
>>
>> [    2.605494] cxgb4 0000:50:00.4: Coming up as MASTER: Adapter already
>> initialized
>> [    2.605511] cxgb4 0000:50:00.4: bad SGE FL page buffer sizes [0, 0]
>> [    2.625629] cxgb4: probe of 0000:50:00.4 failed with error -22
>>
>> The solution is to treat the adapter as not initialized in case the
>> parameters are invalid.
> The patch doesn't look right to me.  Besides reinitializing the device when it finds
> disagreeable settings it disregards that this PF may not be in charge of the device.
> If the controlling PF (what the code calls master) selects values this PF doesn't like
> with the patch it will elevate itself to master and install its own preferences.
>
> Also not right of course is that FW is claiming the device is initialized when clearly it isn't.
> Can you tell me which FW version is involved here and what steps got the device in this state?
>
>> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
>> ---
>>   drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c |   34 +++++++++++++---------
>>   1 files changed, 20 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
>> b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
>> index 34e2488..d0638f9 100644
>> --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
>> +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
>> @@ -5237,13 +5237,27 @@ static int adap_init0(struct adapter *adap)
>>   	 * master initialization), note that we're living with existing
>>   	 * adapter parameters.  Otherwise, it's time to try initializing the
>>   	 * adapter ...
>> +	 *
>> +	 * If we're living with non-hard-coded parameters (either from a
>> +	 * Firmware Configuration File or values programmed by a different PF
>> +	 * Driver), give the SGE code a chance to pull in anything that it
>> +	 * needs ...  Note that this must be called after we retrieve our VPD
>> +	 * parameters in order to know how to convert core ticks to seconds.
>>   	 */
>>   	if (state == DEV_STATE_INIT) {
>>   		dev_info(adap->pdev_dev, "Coming up as %s: "\
>>   			 "Adapter already initialized\n",
>>   			 adap->flags & MASTER_PF ? "MASTER" : "SLAVE");
>>   		adap->flags |= USING_SOFT_PARAMS;
>> -	} else {
>> +		ret = t4_sge_init(adap);
>> +		if (ret == -EINVAL) {
>> +			adap->flags &= ~USING_SOFT_PARAMS;
>> +			state = DEV_STATE_UNINIT;
>> +		} else if (ret < 0) {
>> +			goto bye;
>> +		}
>> +	}
>> +	if (state != DEV_STATE_INIT) {
>>   		dev_info(adap->pdev_dev, "Coming up as MASTER: "\
>>   			 "Initializing adapter\n");
>>
>> @@ -5300,19 +5314,11 @@ static int adap_init0(struct adapter *adap)
>>   				-ret);
>>   			goto bye;
>>   		}
>> -	}
>> -
>> -	/*
>> -	 * If we're living with non-hard-coded parameters (either from a
>> -	 * Firmware Configuration File or values programmed by a different PF
>> -	 * Driver), give the SGE code a chance to pull in anything that it
>> -	 * needs ...  Note that this must be called after we retrieve our VPD
>> -	 * parameters in order to know how to convert core ticks to seconds.
>> -	 */
>> -	if (adap->flags & USING_SOFT_PARAMS) {
>> -		ret = t4_sge_init(adap);
>> -		if (ret < 0)
>> -			goto bye;
>> +		if (adap->flags & USING_SOFT_PARAMS) {
>> +			ret = t4_sge_init(adap);
>> +			if (ret < 0)
>> +				goto bye;
>> +		}
>>   	}
>>
>>   	if (is_bypass_device(adap->pdev->device))
>> --
>> 1.7.1

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