From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by dpdk.org (Postfix) with ESMTP id 422C82C10; Fri, 18 Nov 2016 17:37:43 +0100 (CET) Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga103.fm.intel.com with ESMTP; 18 Nov 2016 08:37:42 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,510,1473145200"; d="scan'208";a="32878267" Received: from bricha3-mobl3.ger.corp.intel.com ([10.237.221.64]) by orsmga005.jf.intel.com with SMTP; 18 Nov 2016 08:37:39 -0800 Received: by (sSMTP sendmail emulation); Fri, 18 Nov 2016 16:37:38 +0000 Date: Fri, 18 Nov 2016 16:37:38 +0000 From: Bruce Richardson To: Neil Horman Cc: Hemant Agrawal , Jerin Jacob , "dev@dpdk.org" , "users@dpdk.org" , "Jacob, Jerin" , Jan Viktorin Message-ID: <20161118163737.GA11072@bricha3-MOBL3.ger.corp.intel.com> References: <20161113205924.GA11392@localhost.localdomain> <20161114144839.GA15570@hmsreliant.think-freely.org> <20161115150800.GB11283@hmsreliant.think-freely.org> <20161118135052.GA29049@hmsreliant.think-freely.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20161118135052.GA29049@hmsreliant.think-freely.org> Organization: Intel Research and =?iso-8859-1?Q?De=ACvel?= =?iso-8859-1?Q?opment?= Ireland Ltd. User-Agent: Mutt/1.7.1 (2016-10-04) Subject: Re: [dpdk-dev] pmdinfogen issues: cross compilation for ARM fails with older host compiler X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Nov 2016 16:37:44 -0000 On Fri, Nov 18, 2016 at 08:50:52AM -0500, Neil Horman wrote: > On Fri, Nov 18, 2016 at 12:03:19PM +0000, Hemant Agrawal wrote: > > > -----Original Message----- > > > From: Neil Horman [mailto:nhorman@tuxdriver.com] > > > On Tue, Nov 15, 2016 at 09:34:16AM +0000, Hemant Agrawal wrote: > > > > > On Mon, Nov 14, 2016 at 02:29:24AM +0530, Jerin Jacob wrote: > > > > > > On Fri, Nov 11, 2016 at 10:34:39AM +0000, Hemant Agrawal wrote: > > > > > > > Hi Neil, > > > > > > > Pmdinfogen compiles with host compiler. It usages > > > rte_byteorder.h > > > > > of the target platform. > > > > > > > However, if the host compiler is older than 4.8, it will be an issue during > > > cross > > > > > compilation for some platforms. > > > > > > > e.g. if we are compiling on x86 host for ARM, x86 host compiler will not > > > > > understand the arm asm instructions. > > > > > > > > > > > > > > /* fix missing __builtin_bswap16 for gcc older then 4.8 */ #if > > > > > > > !(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) static > > > > > > > inline uint16_t rte_arch_bswap16(uint16_t _x) { > > > > > > > register uint16_t x = _x; > > > > > > > asm volatile ("rev16 %0,%1" > > > > > > > : "=r" (x) > > > > > > > : "r" (x) > > > > > > > ); > > > > > > > return x; > > > > > > > } > > > > > > > #endif > > > > > > > > > > > > > > One easy solution is that we add compiler platform check in this > > > > > > > code section of rte_byteorder.h e.g #if !(defined __arm__ || defined > > > > > > > __aarch64__) static inline uint16_t rte_arch_bswap16(uint16_t _x) { > > > > > > > return (_x >> 8) | ((_x << 8) & 0xff00); } #else …. > > > > > > > > > > > > > > Is there a better way to fix it? > > > > > > > > > > > > IMO, It is a HOST build infrastructure issue. If a host app is using > > > > > > the dpdk service then it should compile and link against HOST > > > > > > target(in this specific case, build/x86_64-native-linuxapp-gcc). I > > > > > > think, introducing the HOSTTARGET kind of scheme is a clean solution. > > > > > > > > > > > > /Jerin > > > > > > > > > > > > > > > > > That would be accurate. That is to say, pmdinfogen is a tool that should only > > > be > > > > > run on the host doing the build, by the host doing the build, and so should be > > > > > compiled to run on the host, not on the target being built for. > > > > > > > > > > Yeah, so what we need is a way to get to the host version of rte_byteorder.h > > > > > when building in a cross environment > > > > > > > > > +1 > > > > > > > > > Neil > > > > > > > > > > Give this a try, I've tested it on linux, but not BSD. From what I read the > > > functions are not posix compliant, though they should exist on all BSD and Linux > > > systems in recent history. There may be some fiddling needed for Net and > > > OpenBSD variants, but I think this is the right general direction. > > > > + 1 > > This patch works good for Linux. > > > Can someone test it on BSD? I'd like to ensure we don't need to modify it for > that platform > > Neil > > > > > > > > > > diff --git a/buildtools/pmdinfogen/pmdinfogen.h > > > b/buildtools/pmdinfogen/pmdinfogen.h > > > index 1da2966..c5ef89d 100644 > > > --- a/buildtools/pmdinfogen/pmdinfogen.h > > > +++ b/buildtools/pmdinfogen/pmdinfogen.h > > > @@ -21,7 +21,6 @@ > > > #include > > > #include > > > #include > > > -#include > > > > > > /* On BSD-alike OSes elf.h defines these according to host's word size */ > > > #undef ELF_ST_BIND > > > @@ -75,9 +74,9 @@ > > > #define CONVERT_NATIVE(fend, width, x) ({ \ > > > typeof(x) ___x; \ > > > if ((fend) == ELFDATA2LSB) \ > > > - ___x = rte_le_to_cpu_##width(x); \ > > > + ___x = le##width##toh(x); \ > > > else \ > > > - ___x = rte_be_to_cpu_##width(x); \ > > > + ___x = be##width##toh(x); \ > > > ___x; \ > > > }) > > > For compile on FreeBSD 10 we need "#include " and this works. /Bruce