From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:56435 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1753499AbYEETuN (ORCPT ); Mon, 5 May 2008 15:50:13 -0400 Date: Mon, 05 May 2008 12:50:13 -0700 (PDT) Message-Id: <20080505.125013.129139559.davem@davemloft.net> (sfid-20080505_214932_730322_84FBADCE) To: johannes@sipsolutions.net Cc: tomasw@gmail.com, linville@tuxdriver.com, netdev@vger.kernel.org, linux-wireless@vger.kernel.org Subject: Re: [RFC v2] mac80211: assign needed_headroom/tailroom for netdevs From: David Miller In-Reply-To: <1210014316.4181.14.camel@johannes.berg> References: <1210010254.4181.4.camel@johannes.berg> <20080505.115855.137964071.davem@davemloft.net> <1210014316.4181.14.camel@johannes.berg> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Johannes Berg Date: Mon, 05 May 2008 21:05:15 +0200 > On Mon, 2008-05-05 at 11:58 -0700, David Miller wrote: > > From: Johannes Berg > > Date: Mon, 05 May 2008 19:57:34 +0200 > > > > > NETIF_F_FRAGLIST I haven't understood, but it seems to apply mostly for > > > IP fragmentation? > > > > That's right. It's for cards that can do IP fragmentation in > > hardware. > > What does "do IP fragmentation in hardware" mean? My bad, it merely allows for devices that can handle frag lists in sk_buff as transmit packets. I guess you could use this, btw, to take on arbitrary things to the front of frames to handle big headers. But that's more expensive than just getting the LL header length right.