netdev - Re: [PATCH v2 net] r8169: fix NAPI handling under high load

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Date:   Thu, 18 Oct 2018 11:34:44 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     hkallweit1@...il.com
Cc:     nic_swsd@...ltek.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net] r8169: fix NAPI handling under high load

From: Heiner Kallweit <hkallweit1@...il.com>
Date: Thu, 18 Oct 2018 19:56:01 +0200

> rtl_rx() and rtl_tx() are called only if the respective bits are set
> in the interrupt status register. Under high load NAPI may not be
> able to process all data (work_done == budget) and it will schedule
> subsequent calls to the poll callback.
> rtl_ack_events() however resets the bits in the interrupt status
> register, therefore subsequent calls to rtl8169_poll() won't call
> rtl_rx() and rtl_tx() - chip interrupts are still disabled.
> 
> Fix this by calling rtl_rx() and rtl_tx() independent of the bits
> set in the interrupt status register. Both functions will detect
> if there's nothing to do for them.
> 
> Fixes: da78dbff2e05 ("r8169: remove work from irq handler.")
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---
> v2:
> - added "Fixes" tag

Applied and queued up for -stable, thanks!

And I agree that moving the IRQ ACKing to the hw irq handler is
net-next material.