netdev - Re: [PATCH v2 3/3] xen/netback: use same error messages for same errors

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Date:   Wed, 29 Mar 2023 08:21:29 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Jan Beulich <jbeulich@...e.com>
Cc:     Wei Liu <wei.liu@...nel.org>, Paul Durrant <paul@....org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v2 3/3] xen/netback: use same error messages for same
 errors

On 28.03.23 15:32, Jan Beulich wrote:
> On 28.03.2023 15:12, Juergen Gross wrote:
>> Issue the same error message in case an illegal page boundary crossing
>> has been detected in both cases where this is tested.
>>
>> Suggested-by: Jan Beulich <jbeulich@...e.com>
>> Signed-off-by: Juergen Gross <jgross@...e.com>
>> ---
>> V2:
>> - new patch
>> ---
>>   drivers/net/xen-netback/netback.c | 6 ++----
>>   1 file changed, 2 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
>> index 9ca4b69d3b39..5dfdec44354a 100644
>> --- a/drivers/net/xen-netback/netback.c
>> +++ b/drivers/net/xen-netback/netback.c
>> @@ -996,10 +996,8 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue,
>>   
>>   		/* No crossing a page as the payload mustn't fragment. */
>>   		if (unlikely((txreq.offset + txreq.size) > XEN_PAGE_SIZE)) {
>> -			netdev_err(queue->vif->dev,
>> -				   "txreq.offset: %u, size: %u, end: %lu\n",
>> -				   txreq.offset, txreq.size,
>> -				   (unsigned long)(txreq.offset&~XEN_PAGE_MASK) + txreq.size);
>> +			netdev_err(queue->vif->dev, "Cross page boundary, txp->offset: %u, size: %u\n",
>> +				   txreq.offset, txreq.size);
>>   			xenvif_fatal_tx_err(queue->vif);
>>   			break;
>>   		}
> 
> To be honest I'm of the opinion that this goes slightly too far:
> Making the two messages more similar is certainly helpful. But in
> case of problems I think it wouldn't hurt if they're still
> distinguishable - when the one here triggers it may e.g also mean
> that the calculation of the residual size is causing an issue. So
> maybe stick to txreq.offset in the message text, with everything
> else left as you have it?

Fine with me.


Juergen


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