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

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Message-ID: <225290e4-02be-483b-855f-5215424286b0@gmail.com>
Date:   Tue, 16 Oct 2018 17:21:45 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        Holger Hoffstätte <holger@...lied-asynchrony.com>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        David Miller <davem@...emloft.net>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net] r8169: fix NAPI handling under high load



On 10/16/2018 04:03 PM, Stephen Hemminger wrote:

> Many drivers have buggy usage of napi_complete_done.
> 
> Might even be worth forcing all network drivers to check the return
> value. But fixing 150 broken drivers will be a nuisance.
> 
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index dc1d9ed33b31..c38bc66ffe74 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -466,7 +466,8 @@ static inline bool napi_reschedule(struct napi_struct *napi)
>         return false;
>  }
>  
> -bool napi_complete_done(struct napi_struct *n, int work_done);
> +bool __must_check napi_complete_done(struct napi_struct *n, int work_done);
> +
>  /**
>   *     napi_complete - NAPI processing complete
>   *     @n: NAPI context
> 

I disagree completely.
This never has been a requirement.