linux-kernel - Re: [PATCH v8 net-next 2/7] net: add low latency socket poll

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Date:	Mon, 03 Jun 2013 06:05:04 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>
Cc:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	e1000-devel@...ts.sourceforge.net,
	Willem de Bruijn <willemb@...gle.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Andi Kleen <andi@...stfloor.org>, HPA <hpa@...or.com>,
	Eilon Greenstien <eilong@...adcom.com>,
	Or Gerlitz <or.gerlitz@...il.com>,
	Alex Rosenbaum <alexr@...lanox.com>,
	Eliezer Tamir <eliezer@...ir.org.il>
Subject: Re: [PATCH v8 net-next 2/7] net: add low latency socket poll

On Mon, 2013-06-03 at 11:01 +0300, Eliezer Tamir wrote:
> Adds an ndo_ll_poll method and the code that supports it.
> This method can be used by low latency applications to busy-poll
> Ethernet device queues directly from the socket code.
> sysctl_net_ll_poll controls how many microseconds to poll.
> Default is zero (disabled).
> Individual protocol support will be added by subsequent patches.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Tested-by: Willem de Bruijn <willemb@...gle.com>
> Signed-off-by: Eliezer Tamir <eliezer.tamir@...ux.intel.com>
> ---
...
> diff --git a/include/net/ll_poll.h b/include/net/ll_poll.h

> +
> +static inline bool sk_valid_ll(struct sock *sk)
> +{
> +	return 0;

	return false;

> +}
> +
> +static inline bool sk_poll_ll(struct sock *sk, int nonblock)
> +{
> +	return 0;

	return false;
> +}
> +
> +static inline void skb_mark_ll(struct sk_buff *skb, struct napi_struct *napi)
> +{
> +}


>  	/*
>  	 * Before updating sk_refcnt, we must commit prior changes to memory
>  	 * (Documentation/RCU/rculist_nulls.txt for details)
> diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
> index 741db5fc..ae98c95 100644
> --- a/net/core/sysctl_net_core.c
> +++ b/net/core/sysctl_net_core.c
> @@ -19,6 +19,7 @@
>  #include <net/ip.h>
>  #include <net/sock.h>
>  #include <net/net_ratelimit.h>
> +#include <net/ll_poll.h>
>  
>  static int one = 1;
>  
> @@ -284,6 +285,15 @@ static struct ctl_table net_core_table[] = {
>  		.proc_handler	= flow_limit_table_len_sysctl
>  	},
>  #endif /* CONFIG_NET_FLOW_LIMIT */
> +#ifdef CONFIG_NET_LL_RX_POLL
> +	{
> +		.procname	= "low_latency_poll",
> +		.data		= &sysctl_net_ll_poll,
> +		.maxlen		= sizeof(unsigned long),
> +		.mode		= 0644,
> +		.proc_handler	= proc_dointvec

proc_doulongvec_minmax



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