netdev - Re: [RFC PATCH net-next 0/3] net: batched receive in GRO path

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Date:   Wed, 10 Jul 2019 17:41:29 +0200
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Edward Cree <ecree@...arflare.com>,
        Paolo Abeni <pabeni@...hat.com>,
        David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [RFC PATCH net-next 0/3] net: batched receive in GRO path



On 7/10/19 4:52 PM, Edward Cree wrote:

> Hmm, I was caught out by the call to napi_poll() actually being a local
>  function pointer, not the static function of the same name.  How did a
>  shadow like that ever get allowed?
> But in that case I _really_ don't understand napi_busy_loop(); nothing
>  in it seems to ever flush GRO, so it's relying on either
>  (1) stuff getting flushed because the bucket runs out of space, or
>  (2) the next napi poll after busy_poll_stop() doing the flush.
> What am I missing, and where exactly in napi_busy_loop() should the
>  gro_normal_list() call go?

Please look at busy_poll_stop()