Re: [RFC] netem: de-GSO packets before enqueing

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On Fri, 13 Jan 2012 16:54:57 +0100
Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote:

> Le jeudi 12 janvier 2012 à 16:57 -0800, Stephen Hemminger a écrit :
> > Probably something like this is needed (untested).
> > 
> > This issue was discovered when looking at the skb_checksum path for the
> > netem corruption operation, but it is a general problem.
> > Network emulation operations like corruption and drop want to operate
> > on a per-packet (not per-segment) basis. This patch does GSO in software
> > if necessary to break up packets.  Code is similar to logic in xfrm_output.
> > 
> > Although it appears that the operation is not work conserving, it is okay
> > because the higher level qdisc operations account for packets by incrementing
> > by gso_size.
> 
> gso_size ok, but what about qlen ?
> 
> We end up splitting one GSO skb in multiple segments, but shouldnt we
> instruct upper qdisc(s) that qlen was increased, sort of
> qdisc_tree_increase_qlen() call ?
> 
> 
> 

Also, does pkt_len need to be set in cb after de-gso?
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