netdev - Re: [PATCH net-next] fq_codel: report congestion notification at enqueue time

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Message-Id: <20120629.010429.52786940228506998.davem@davemloft.net>
Date:	Fri, 29 Jun 2012 01:04:29 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, dave.taht@...il.com,
	codel@...ts.bufferbloat.net, therbert@...gle.com,
	mattmathis@...gle.com, ycheng@...gle.com, nanditad@...gle.com,
	ncardwell@...gle.com
Subject: Re: [PATCH net-next] fq_codel: report congestion notification at
 enqueue time

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 29 Jun 2012 07:50:08 +0200

> Hmm, problem is the sender thinks the packet was queued for
> transmission.
> 
>         ret = macvlan_queue_xmit(skb, dev);
>         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
>                 struct macvlan_pcpu_stats *pcpu_stats;
> 
>                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
>                 u64_stats_update_begin(&pcpu_stats->syncp);
>                 pcpu_stats->tx_packets++;
>                 pcpu_stats->tx_bytes += len;
>                 u64_stats_update_end(&pcpu_stats->syncp);
>         } else {
>                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
>         }

Ok, that is the meaning this has taken on.  Same test exists in
vlan_dev.c and this test used to be present also in the ipip.h macros
some time ago.

Nobody really does anything special with this value, except to
translate it to a zero 0 when propagating back to sockets.

The only thing it guards is the selection of which statistic to
increment.

For all practical purposes it is treated as NET_XMIT_SUCCESS except in
one location, pktgen, where it causes the errors counter to increment.

Looking this over, I'd say we should just get rid of it.
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