From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from rv-out-0506.google.com ([209.85.198.226]:27559 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752269AbYEGX3K (ORCPT ); Wed, 7 May 2008 19:29:10 -0400 Received: by rv-out-0506.google.com with SMTP id l9so618973rvb.1 for ; Wed, 07 May 2008 16:29:10 -0700 (PDT) Message-ID: <1ba2fa240805071629i6c7336f6y61a7c9690820ef5e@mail.gmail.com> (sfid-20080508_012824_911250_254F858B) Date: Thu, 8 May 2008 02:29:09 +0300 From: "Tomas Winkler" To: "Johannes Berg" Subject: Re: iwlwifi and tx info in skb->cb Cc: "Ron Rindjunsky" , linux-wireless In-Reply-To: <1210197711.3547.1.camel@johannes.berg> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 References: <1210197711.3547.1.camel@johannes.berg> Sender: linux-wireless-owner@vger.kernel.org List-ID: On Thu, May 8, 2008 at 1:01 AM, Johannes Berg wrote: > Hi, > > I was just trying to make iwlwifi work again with tx info in skb->cb, > but am running into something I don't understand: > > What is a TFD, and why can it have multiple SKBs with a single tx > status? I'm referring to: TFD stands for TX File Descriptor > /* One for each TFD */ > struct iwl3945_tx_info { > struct ieee80211_tx_status status; > struct sk_buff *skb[MAX_NUM_OF_TBS]; > }; > > I would have expected something like this with 4965 that has aggregation > support (and aggregation is reported just once) but here? Confused. This is for scatter gather. Nothing to do with aggregation. If you get fragmented frame you can send it out without linearizing in CPU. in numer of TB - TX buffers (which is limitted bu MAX_NUM_OF_TBS) But I'm just over ever explaining :) Thanks Tomas > johannes >