netdev - Re: [PATCH 0/3] Basic deferred TX queue flushing infrastructure.

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Message-ID: <1408901868.5604.60.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sun, 24 Aug 2014 10:37:48 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, therbert@...gle.com, jhs@...atatu.com,
	hannes@...essinduktion.org, edumazet@...gle.com,
	jeffrey.t.kirsher@...el.com, rusty@...tcorp.com.au
Subject: Re: [PATCH 0/3] Basic deferred TX queue flushing infrastructure.

On Sat, 2014-08-23 at 21:38 -0700, David Miller wrote:

> Like Tom Herbert has mentioned we have all the infrastructure (sort
> of) already to handle a list of SKBs going down into
> dev_hard_start_xmit() via the GSO handling.
> 
> But that code is funny, because it keeps the original GSO head SKB
> around as a placeholder to maintain the list of segmented SKBs.

This is because dev_hard_start_xmit() do not return an skb, but a rc
code.

int ret = dev_hard_start_xmit(skb, dev, txq);

That can be changed so that we do not have to keep the original skb as
the GSO head :

sch_direct_xmit() would 'requeue' the new skb (might be in the middle of
the skb segmented chain), not the original one.

This would get rid of DEV_GSO_CB() presumably.



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