From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas@monjalon.net>
Subject: Re: PCI domain size
Date: Wed, 07 Jun 2017 16:23:09 +0200
Message-ID: <4912406.Tfa8CUZAWC@xps>
References: <20170524164008.4d4e8e7b@xeon-e3>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7Bit
Cc: dev@dpdk.org
To: Stephen Hemminger <stephen@networkplumber.org>
Return-path: <dev-bounces@dpdk.org>
Received: from out1-smtp.messagingengine.com (out1-smtp.messagingengine.com
 [66.111.4.25]) by dpdk.org (Postfix) with ESMTP id B522E2BBB
 for <dev@dpdk.org>; Wed,  7 Jun 2017 16:23:10 +0200 (CEST)
In-Reply-To: <20170524164008.4d4e8e7b@xeon-e3>
List-Id: DPDK patches and discussions <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
Errors-To: dev-bounces@dpdk.org
Sender: "dev" <dev-bounces@dpdk.org>

25/05/2017 01:40, Stephen Hemminger:
> While working on SR-IOV support on Azure, it was discovered that some applications
> and drivers do not support full size PCI domains. On Azure environment the PCI pass
> through device has a synthetic domain value (ie generated by host) which is > 16 bits.
> 
> The common PCI utilities (pci-utils) and Linux kernel both support
> full 32 bits but DPDK does not. FreeBSD also supports 32 bit domains.
> 
> Changing the one place in DPDK (rte_pci.h) in source is trivial but of course
> it is a major ABI breakage which is a complete flag day. I.e no binary compatiabilty
> is possible.

I guess you are talking about
struct rte_pci_addr {
	uint16_t domain;
	uint8_t bus;
	uint8_t devid;
	uint8_t function;
};

I do not see why we would not change it to comply to the standard.
Do you want to propose a deprecation?