From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <bruce.richardson@intel.com>
Received: from mga11.intel.com (mga11.intel.com [192.55.52.93])
 by dpdk.org (Postfix) with ESMTP id 215B1530A
 for <dev@dpdk.org>; Tue, 25 Nov 2014 11:40:52 +0100 (CET)
Received: from fmsmga001.fm.intel.com ([10.253.24.23])
 by fmsmga102.fm.intel.com with ESMTP; 25 Nov 2014 02:51:44 -0800
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.07,455,1413270000"; d="scan'208";a="627904916"
Received: from bricha3-mobl3.ger.corp.intel.com ([10.243.20.15])
 by fmsmga001.fm.intel.com with SMTP; 25 Nov 2014 02:51:41 -0800
Received: by  (sSMTP sendmail emulation); Tue, 25 Nov 2014 10:51:41 +0025
Date: Tue, 25 Nov 2014 10:51:41 +0000
From: Bruce Richardson <bruce.richardson@intel.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>
Message-ID: <20141125105141.GI5260@bricha3-MOBL3>
References: <1416692622-28886-1-git-send-email-thomas.monjalon@6wind.com>
 <1416692622-28886-10-git-send-email-thomas.monjalon@6wind.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1416692622-28886-10-git-send-email-thomas.monjalon@6wind.com>
Organization: Intel Shannon Ltd.
User-Agent: Mutt/1.5.23 (2014-03-12)
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH 09/10] eal: get relative core index
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Tue, 25 Nov 2014 10:40:53 -0000

On Sat, Nov 22, 2014 at 10:43:41PM +0100, Thomas Monjalon wrote:
> From: Patrick Lu <Patrick.Lu@intel.com>
> 
> EAL -c option allows the user to enable any lcore in the system.
> Often times, the user app wants to know 1st enabled core, 2nd
> enabled core, etc, rather than phyical core ID (rte_lcore_id().)
> 
> The new API rte_lcore_index() will return an index from enabled lcores
> starting from zero.
> 
> Signed-off-by: Patrick Lu <patrick.lu@intel.com>
> Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>

I think this is good as far as it goes, but I think an extra API to get the
lcore with the given index would be a great extension to this. That would
allow you to do:

rte_eal_remote_launch(func0, arg0, rte_lcore_with_index(0));
rte_eal_remote_launch(func1, arg1, rte_lcore_with_index(1));
...

However, as a good start, I think this should be applied for now, so...

Acked-by: Bruce Richardson <bruce.richardson@intel.com>

> ---
>  lib/librte_eal/common/eal_common_options.c | 13 ++++++++++---
>  lib/librte_eal/common/include/rte_lcore.h  | 20 ++++++++++++++++++++
>  2 files changed, 30 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
> index 18d03e3..c9df8f5 100644
> --- a/lib/librte_eal/common/eal_common_options.c
> +++ b/lib/librte_eal/common/eal_common_options.c
> @@ -185,19 +185,23 @@ eal_parse_coremask(const char *coremask)
>  					return -1;
>  				}
>  				cfg->lcore_role[idx] = ROLE_RTE;
> +				lcore_config[idx].core_index = count;
>  				if (count == 0)
>  					cfg->master_lcore = idx;
>  				count++;
>  			} else {
>  				cfg->lcore_role[idx] = ROLE_OFF;
> +				lcore_config[idx].core_index = -1;
>  			}
>  		}
>  	}
>  	for (; i >= 0; i--)
>  		if (coremask[i] != '0')
>  			return -1;
> -	for (; idx < RTE_MAX_LCORE; idx++)
> +	for (; idx < RTE_MAX_LCORE; idx++) {
>  		cfg->lcore_role[idx] = ROLE_OFF;
> +		lcore_config[idx].core_index = -1;
> +	}
>  	if (count == 0)
>  		return -1;
>  	/* Update the count of enabled logical cores of the EAL configuration */
> @@ -225,9 +229,11 @@ eal_parse_corelist(const char *corelist)
>  	while ((i > 0) && isblank(corelist[i - 1]))
>  		i--;
>  
> -	/* Reset core roles */
> -	for (idx = 0; idx < RTE_MAX_LCORE; idx++)
> +	/* Reset config */
> +	for (idx = 0; idx < RTE_MAX_LCORE; idx++) {
>  		cfg->lcore_role[idx] = ROLE_OFF;
> +		lcore_config[idx].core_index = -1;
> +	}
>  
>  	/* Get list of cores */
>  	min = RTE_MAX_LCORE;
> @@ -250,6 +256,7 @@ eal_parse_corelist(const char *corelist)
>  				min = idx;
>  			for (idx = min; idx <= max; idx++) {
>  				cfg->lcore_role[idx] = ROLE_RTE;
> +				lcore_config[idx].core_index = count;
>  				if (count == 0)
>  					cfg->master_lcore = idx;
>  				count++;
> diff --git a/lib/librte_eal/common/include/rte_lcore.h b/lib/librte_eal/common/include/rte_lcore.h
> index a0b4356..49b2c03 100644
> --- a/lib/librte_eal/common/include/rte_lcore.h
> +++ b/lib/librte_eal/common/include/rte_lcore.h
> @@ -64,6 +64,7 @@ struct lcore_config {
>  	volatile enum rte_lcore_state_t state; /**< lcore state */
>  	unsigned socket_id;        /**< physical socket id for this lcore */
>  	unsigned core_id;          /**< core number on socket for this lcore */
> +	int core_index;            /**< relative index, starting from 0 */
>  };
>  
>  /**
> @@ -110,6 +111,25 @@ rte_lcore_count(void)
>  }
>  
>  /**
> + * Return the index of the lcore starting from zero.
> + * The order is physical or given by command line (-l option).
> + *
> + * @param lcore_id
> + *   The targeted lcore, or -1 for the current one.
> + * @return
> + *   The relative index, or -1 if not enabled.
> + */
> +static inline int
> +rte_lcore_index(int lcore_id)
> +{
> +	if (lcore_id >= RTE_MAX_LCORE)
> +		return -1;
> +	if (lcore_id < 0)
> +		lcore_id = rte_lcore_id();
> +	return lcore_config[lcore_id].core_index;
> +}
> +
> +/**
>   * Return the ID of the physical socket of the logical core we are
>   * running on.
>   * @return
> -- 
> 2.1.3
>