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Message-ID: <66c5c2d3-65df-8506-6934-5628e709e229@cambridgegreys.com> Date: Mon, 8 May 2017 08:15:15 +0100 From: Anton Ivanov <anton.ivanov@...bridgegreys.com> To: "David S. Miller" <davem@...emloft.net> Cc: netdev@...r.kernel.org Subject: net_sched strange in 4.11 Hi all, I was revising some of my old work for UML to prepare it for submission and I noticed that skb->xmit_more does not seem to be set any more. I traced the issue as far as net/sched/sched_generic.c try_bulk_dequeue_skb() is never invoked (the drivers I am working on are dql enabled so that is not the problem). More interestingly, if I put a breakpoint and debug output into dequeue_skb() around line 147 - right before the bulk: tag that skb there is always NULL. ??? Similarly, debug in pfifo_fast_dequeue shows only NULLs being dequeued. Again - ??? First and foremost, I apologize for the silly question, but how can this work at all? I see the skbs showing up at the driver level, why are NULLs being returned at qdisc dequeue and where do the skbs at the driver level come from? Second, where should I look to fix it? A.
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