From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 635B1A046B for ; Mon, 22 Jul 2019 20:34:50 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 795DC1BF42; Mon, 22 Jul 2019 20:34:46 +0200 (CEST) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by dpdk.org (Postfix) with ESMTP id C4DCF1BF3F for ; Mon, 22 Jul 2019 20:34:44 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 Jul 2019 11:34:44 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,296,1559545200"; d="scan'208";a="192811924" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by fmsmga004.fm.intel.com with ESMTP; 22 Jul 2019 11:34:42 -0700 To: Lance Richardson , Thomas Monjalon Cc: Ajit Khaparde , dev@dpdk.org, Somnath Kotur References: <20190718033616.37605-1-ajit.khaparde@broadcom.com> <20190718033616.37605-10-ajit.khaparde@broadcom.com> <3634179.vNFH5eg47m@xps> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH 09/22] net/bnxt: use dedicated cpr for async events X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 7/22/2019 6:57 PM, Lance Richardson wrote: > On Mon, Jul 22, 2019 at 11:06 AM Thomas Monjalon wrote: >> >> 22/07/2019 16:57, Ferruh Yigit: >>> On 7/18/2019 4:36 AM, Ajit Khaparde wrote: >>>> From: Lance Richardson >>>> --- a/config/common_base >>>> +++ b/config/common_base >>>> @@ -212,6 +212,7 @@ CONFIG_RTE_LIBRTE_BNX2X_DEBUG_PERIODIC=n >>>> # Compile burst-oriented Broadcom BNXT PMD driver >>>> # >>>> CONFIG_RTE_LIBRTE_BNXT_PMD=y >>>> +CONFIG_RTE_LIBRTE_BNXT_SHARED_ASYNC_RING=n >>> >>> Normally we don't want to introduce new config time options as much as possible. >>> >>> This is what happens when patches slip in the last minute, please Ajit try to >>> send patches before proposal next time. >>> >>> And back to the config option, is it something have to be a compile time flag >>> (if so why?), can it be replaced by a devarg? >> >> I confirm it is nack. >> I don't see any reason not to replace it with a runtime devargs. >> >> > > This build-time configuration option was introduced because the > "shared async completion > ring" configuration is needed for one specific platform, > arm64-stingray-linux-gcc. This > configuration has a number of drawbacks and should be avoided > otherwise. Making it > a run-time option will add complexity and introduce the possibility > that existing stingray > users will not know that they need to specify this option as of 19.08, > so it would be good > if some other way could be found to handle this. I see this provides a configuration transparent to user, but won't this kill the binary portability? If a distro packages an 'armv8a' target and distributes it, this won't be usable in your 'stingray' platform for the driver. But if this is added as a devargs, it can be usable even with distributed binaries, by providing proper devargs to binary for a specific platform. And documenting this devargs in NIC guide can help users to figure it out. > > Other than perhaps using RTE_ARCH_ARM64 to select the shared completion ring > configuration (which would obviously affect all ARM64 users), are > there any other options > that might be acceptable? > > It's maybe worthwhile to note that the last several DPDK releases use > the "shared completion > ring" configuration. > I dropped this patch from next-net since discussion is going on, I did my best to resolve the conflicts but please confirm the final result in next-net.