From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <shemminger@vyatta.com>
Subject: Re: [PATCH 3/5 net-next] cnic: Randomize initial TCP port for iSCSI
 connections
Date: Thu, 9 Jun 2011 08:27:22 -0700
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Cc: davem@davemloft.net, netdev@vger.kernel.org,
	"Eddie Wai" <eddie.wai@broadcom.com>
To: "Michael Chan" <mchan@broadcom.com>
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On Wed, 8 Jun 2011 22:29:34 -0700
"Michael Chan" <mchan@broadcom.com> wrote:

>  static int cnic_cm_alloc_mem(struct cnic_dev *dev)
>  {
>  	struct cnic_local *cp = dev->cnic_priv;
> +	u32 port_id;
>  
>  	cp->csk_tbl = kzalloc(sizeof(struct cnic_sock) * MAX_CM_SK_TBL_SZ,
>  			      GFP_KERNEL);
>  	if (!cp->csk_tbl)
>  		return -ENOMEM;
>  
> +	get_random_bytes(&port_id, sizeof(port_id));

I think random32() or it's alias net_random() would be sufficient
for your needs here.