From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.tuxdriver.com (charlotte.tuxdriver.com [70.61.120.58]) by dpdk.org (Postfix) with ESMTP id 386732C10; Fri, 18 Nov 2016 14:51:14 +0100 (CET) Received: from cpe-2606-a000-111b-40ed-7aac-c0ff-fec2-933b.dyn6.twc.com ([2606:a000:111b:40ed:7aac:c0ff:fec2:933b] helo=localhost) by smtp.tuxdriver.com with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.63) (envelope-from ) id 1c7jZG-0000Dq-2H; Fri, 18 Nov 2016 08:51:07 -0500 Date: Fri, 18 Nov 2016 08:50:52 -0500 From: Neil Horman To: Hemant Agrawal Cc: Jerin Jacob , "dev@dpdk.org" , "users@dpdk.org" , "Jacob, Jerin" , Jan Viktorin Message-ID: <20161118135052.GA29049@hmsreliant.think-freely.org> References: <20161113205924.GA11392@localhost.localdomain> <20161114144839.GA15570@hmsreliant.think-freely.org> <20161115150800.GB11283@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: User-Agent: Mutt/1.7.1 (2016-10-04) X-Spam-Score: -2.9 (--) X-Spam-Status: No 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 13:51:15 -0000 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; \ > > }) > >