On Mon, Aug 22, 2005 at 07:44:59PM -0700, David S. Miller wrote:
>
> It makes perfect sense.  In your example, we want a 2*MSS TSO
> frame for the "not-SACKed" area, and the tail 1*MSS frame for
> the SACKed area.  This provides exactly the necessary granularity
> in order to record the received SACK information.  That's the
> whole point of splitting up the frame here in response to
> SACK blocks.

Sorry, I didn't mean to say that pkt_len is an incorrect cut-off point,
but that it's not a valid value for the MSS.  So I'd like to see

        if (tcp_fragment(sk, skb, pkt_len, TCP_SKB_CB(skb)->tso_size))
                break;
 
> Those statements are all equivalent to the "tp->{lost,left}_out -= diff;"
> code I added.  We were subtracting out the old number, then adding in
> the new one, which is the same as just subtracting the difference in
> one go.
> 
> At least, this simplification looked really nice to me :-)

You are absolutely right.  I had missed your additions below :)
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