netdev - Re: [PATCH v1 net-next 12/14] igb: Only call skb_tx

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Message-ID: <601480f1-d635-3e35-0222-d7e98eb829b6@intel.com>
Date:   Thu, 28 Jun 2018 10:12:46 -0700
From:   Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
To:     Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Cc:     tglx@...utronix.de, jan.altenberg@...utronix.de,
        vinicius.gomes@...el.com, kurt.kanzenbach@...utronix.de,
        henrik@...tad.us, richardcochran@...il.com,
        levi.pearson@...man.com, ilias.apalodimas@...aro.org,
        ivan.khoronzhuk@...aro.org, mlichvar@...hat.com,
        willemb@...gle.com, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us
Subject: Re: [PATCH v1 net-next 12/14] igb: Only call skb_tx_timestamp after
 descriptors are ready



On 06/27/2018 04:56 PM, Eric Dumazet wrote:
> 
> 
> On 06/27/2018 02:59 PM, Jesus Sanchez-Palencia wrote:
>> Currently, skb_tx_timestamp() is being called before the DMA
>> descriptors are prepared in igb_xmit_frame_ring(), which happens
>> during either the igb_tso() or igb_tx_csum() calls.
>>
>> Given that now the skb->tstamp might be used to carry the timestamp
>> for SO_TXTIME, we must only call skb_tx_timestamp() after the
>> information has been copied into the DMA tx_ring.
> 
> 
> Since when this skb->tstamp use happened ?
> 
> If this is in patch 11/14 (igb: Add support for ETF offload), then you should either :
> 
> 1) Squash this into 11/14
> 
> 2) swap 11 and 12 patch, so that this change is done before "igb: Add support for ETF offload"  
> 
> Otherwise a bisection could fail badly.


OK. Fixed for v2 by swapping patches 11 and 12.

Thanks,
Jesus