From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v2 16/16] net: Add support for networking over
 Thunderbolt cable
Date: Wed, 27 Sep 2017 09:27:09 -0700 (PDT)
Message-ID: <20170927.092709.1826177647592316221.davem@davemloft.net>
References: <20170925110738.68382-17-mika.westerberg@linux.intel.com>
        <20170926.214721.734746621809140934.davem@davemloft.net>
        <20170927134238.GC4630@lahna.fi.intel.com>
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: gregkh@linuxfoundation.org, andreas.noever@gmail.com,
        michael.jamet@intel.com, yehezkel.bernat@intel.com,
        amir.jer.levy@intel.com, Mario.Limonciello@dell.com,
        lukas@wunner.de, andriy.shevchenko@linux.intel.com, andrew@lunn.ch,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org
To: mika.westerberg@linux.intel.com
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <20170927134238.GC4630@lahna.fi.intel.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: netdev.vger.kernel.org

From: Mika Westerberg <mika.westerberg@linux.intel.com>
Date: Wed, 27 Sep 2017 16:42:38 +0300

> Using build_skb() then would require to allocate larger buffer, that
> includes NET_SKB_PAD + SKB_DATA_ALIGN(skb_shared_info) and that exceeds
> page size. Is this something supported by build_skb()? It was not clear
> to me based on the code and other users of build_skb() but I may be
> missing something.

You need NET_SKB_PAD before and SKB_DATA_ALIGN(skb_shared_info) afterwards.
An order 1 page, if that's what you need, should work just fine.