From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@suse.com>
Subject: Re: [PATCH 1/2] xen-netback: limit xen vif max queues
 number to online cpus
Date: Fri, 23 Oct 2015 02:20:24 -0600
Message-ID: <562A09E802000078000ADDE7__32444.3692261868$1445588520$gmane$org@prv-mh.provo.novell.com>
References: <5629E796.5040203@oracle.com> <5629E8AF.9020108@oracle.com>
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To: Joe Jin <joe.jin@oracle.com>
Cc: wei.liu2@citrix.com, Ian Campbell <ian.campbell@citrix.com>, netdev@vger.kernel.org, xen-devel@lists.xenproject.org, Boris Ostrovsky <boris.ostrovsky@oracle.com>, "David S. Miller" <davem@davemloft.net>
List-Id: xen-devel@lists.xenproject.org

>>> On 23.10.15 at 09:58, <joe.jin@oracle.com> wrote:
> --- a/drivers/net/xen-netback/netback.c
> +++ b/drivers/net/xen-netback/netback.c
> @@ -68,7 +68,9 @@ unsigned int rx_stall_timeout_msecs = 60000;
>  module_param(rx_stall_timeout_msecs, uint, 0444);
>  
>  unsigned int xenvif_max_queues;
> -module_param_named(max_queues, xenvif_max_queues, uint, 0644);
> +static int xennet_set_max_queues(const char *val, struct kernel_param *kp);
> +module_param_call(max_queues, xennet_set_max_queues, param_get_int,

param_get_uint

> +		  &xenvif_max_queues, 0600);

Why the change from mode 0644 to 0600?

> @@ -107,6 +109,20 @@ static struct xen_netif_rx_response *make_rx_response(struct xenvif_queue *queue
>  					     u16      size,
>  					     u16      flags);
>  
> +static int xennet_set_max_queues(const char *val, struct kernel_param *kp)
> +{
> +	unsigned int cpus = num_online_cpus();
> +	unsigned int max_queues = simple_strtoul(val, NULL, 10);
> +
> +	if (max_queues == 0 || max_queues > cpus) {
> +		pr_info("max_queues %d is out of range [0 - %d]!\n", 

%u in both cases.

> +			max_queues, cpus);
> +		return -EINVAL;

Considering the message: -ERANGE?

> +	}
> +
> +	return param_set_int(val, kp);

param_set_uint()

> @@ -2110,15 +2126,15 @@ int xenvif_dealloc_kthread(void *data)
>  static int __init netback_init(void)
>  {
>  	int rc = 0;
> +	unsigned int cpus = num_online_cpus();
>  
>  	if (!xen_domain())
>  		return -ENODEV;
>  
> -	/* Allow as many queues as there are CPUs if user has not
> -	 * specified a value.
> -	 */
> -	if (xenvif_max_queues == 0)
> -		xenvif_max_queues = num_online_cpus();
> +	/* Allow at most as many queues as CPUs. */
> +	if (xenvif_max_queues == 0 || xenvif_max_queues > cpus)
> +		xenvif_max_queues = cpus;
> +	pr_info("vif max_queues: %d\n", xenvif_max_queues);

%u again.

Jan