From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mga09.intel.com ([134.134.136.24]:25099 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751817Ab1HOQJW (ORCPT ); Mon, 15 Aug 2011 12:09:22 -0400 Subject: Re: [PATCH 05/60] iwlagn: introduce struct iwl-shared - known by all layers From: "Guy, Wey-Yi" To: Stanislaw Gruszka Cc: Johannes Berg , "linville@tuxdriver.com" , "linux-wireless@vger.kernel.org" , "Grumbach, Emmanuel" In-Reply-To: <20110815151231.GB15718@redhat.com> References: <1313257116-2697-1-git-send-email-wey-yi.w.guy@intel.com> <1313257116-2697-6-git-send-email-wey-yi.w.guy@intel.com> <20110815081010.GA3317@redhat.com> <20110815084355.GB3317@redhat.com> <1313414020.15170.32.camel@wwguy-huron> <20110815142144.GA15718@redhat.com> <1313416005.15170.35.camel@wwguy-huron> <20110815144359.GA15719@redhat.com> <1313417422.15170.39.camel@wwguy-huron> <20110815151231.GB15718@redhat.com> Content-Type: text/plain; charset="UTF-8" Date: Mon, 15 Aug 2011 08:29:12 -0700 Message-ID: <1313422152.15170.43.camel@wwguy-huron> (sfid-20110815_180926_296175_CF244594) Mime-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: On Mon, 2011-08-15 at 08:12 -0700, Stanislaw Gruszka wrote: > On Mon, Aug 15, 2011 at 07:10:22AM -0700, Guy, Wey-Yi wrote: > > On Mon, 2011-08-15 at 07:44 -0700, Stanislaw Gruszka wrote: > > > On Mon, Aug 15, 2011 at 06:46:45AM -0700, Guy, Wey-Yi wrote: > > > > On Mon, 2011-08-15 at 07:21 -0700, Stanislaw Gruszka wrote: > > > > > On Mon, Aug 15, 2011 at 06:13:39AM -0700, Guy, Wey-Yi wrote: > > > > > > now we are working on separate iwlagn driver into two layers (upper and > > > > > > lower), the lower layer contains both bus and transport sub-layer which > > > > > > is hw dependent, and the upper layer should be bus/hw independent. by > > > > > > doing so, the single driver can handle different bus and different core > > > > > > architecture. Having the share data structure (priv->shrd->foo) between > > > > > > two layers is for that reason (loosely couple). > > > > > > > > > > You did not explained reason for introducing iwl_shared structure, > > > > > actually you confirmed it is useless. You should simply share iwl_priv > > > > > on any layer you have. > > > > > > > > > > Stanislaw > > > > > > > > It is not true, I mean "boring" but not "useless", it does not make > > > > sense share all the priv with lower layer. > > > > > > Why? Even if there are some fields that you will use only on > > > upper layer, it does not mean that pointer to priv structure > > > could not be passed to lower layer. > > > > > why, if we doing that, lower layer need to know how to reference the > > priv which I don't believe it is a good design. I want to make the upper > > and lower layer as loose as possible and it is flexible for new > > architecture. > > Providing more abstraction layers than needed is worse. I don't really see any issues with it and I don't believe it will cause problem if we do it right. by doing so, we will improve the flexibility. > > > > > think about I also mention > > > > different core architecture, that mean we can have different upper layer > > > > which has different priv; but shrd is always common to all different > > > > upper layer to share with lower layer. > > > > > > What different upper layer? Non mac80211, if so you should write > > > separate driver for it. > > > > not mac80211, it is still part of driver, but different upper layer > > might/can contain different system flow. that is why I mention different > > core architecture. now we are doing preparation work so you did not see > > the new stuff yet. > > Can we get opinion from Johannes about that, and eventually ACKs/NACKs > for patches? > it is pure iwlagn driver changes and not impact mac80211 at all. Johannes already in the loop and he understand the changes. Wey >