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

[Eric Dumazet]

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.