From: "Richardson, Bruce" <bruce.richardson@intel.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>,
"Singh, Jasvinder" <jasvinder.singh@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
"olivier.matz@6wind.com" <olivier.matz@6wind.com>,
"Doherty, Declan" <declan.doherty@intel.com>,
"De Lara Guarch, Pablo" <pablo.de.lara.guarch@intel.com>
Subject: Re: [dpdk-dev] [PATCH v9 0/3] librte_net: add crc computation support
Date: Wed, 5 Apr 2017 09:37:21 +0000 [thread overview]
Message-ID: <59AF69C657FD0841A61C55336867B5B066751DB3@IRSMSX103.ger.corp.intel.com> (raw)
In-Reply-To: <4843218.AadDjlxfvY@xps13>
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Thomas Monjalon
> Sent: Wednesday, April 5, 2017 10:01 AM
> To: Singh, Jasvinder <jasvinder.singh@intel.com>
> Cc: dev@dpdk.org; olivier.matz@6wind.com; Doherty, Declan
> <declan.doherty@intel.com>; De Lara Guarch, Pablo
> <pablo.de.lara.guarch@intel.com>
> Subject: Re: [dpdk-dev] [PATCH v9 0/3] librte_net: add crc computation
> support
>
> 2017-04-05 08:34, Singh, Jasvinder:
> > Hi Thomas,
> >
> > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > 2017-03-30 17:15, Jasvinder Singh:
> > > > In some applications, CRC (Cyclic Redundancy Check) needs to be
> > > > computed or updated during packet processing operations. This
> > > > patchset adds software implementation of some common standard CRCs
> > > > (32-bit Ethernet CRC as per Ethernet/[ISO/IEC 8802-3] and 16-bit
> > > > CCITT-CRC [ITU-T
> > > X.25]).
> > > > Two versions of each 32-bit and 16-bit CRC calculation are proposed.
> > > >
> > > > The first version presents a fast and efficient CRC generation on
> > > > IA processors by using the carry-less multiplication instruction
> > > > PCLMULQDQ (i.e SSE4.2 instrinsics). In this implementation, a
> > > > parallelized folding approach has been used to first reduce an
> > > > arbitrary length buffer to a small fixed size length buffer (16
> > > > bytes) with the
> > > help of precomputed constants.
> > > > The resultant single 16-bytes chunk is further reduced by Barrett
> > > > reduction method to generate final CRC value. For more details on
> > > > the implementation, see reference [1].
> > > >
> > > > The second version presents the fallback solution to support the
> > > > CRC generation without needing any specific support from CPU (for
> > > > examples-
> > > > SSE4.2 intrinsics). It is based on generic Look-Up Table(LUT)
> > > > algorithm that uses precomputed 256 element table as explained in
> > > reference[2].
> > > >
> > > > During intialisation, all the data structures required for CRC
> > > > computation are initialised. Also, x86 specific crc implementation
> > > > (if supported by the platform) or scalar version is enabled.
> > >
> > > As you can see in patchwork, it does not compile on FreeBSD:
> > > http://dpdk.org/ml/archives/test-report/2017-April/016943.html
> >
> > As I stated in the cover letter notes as well that The patchset build
> > fails on clang version earlier than 3.7.0 due to missing intrinsics and
> this issue is listed in DPDK known issue section. FreeBSD build on gcc
> target should work fine.
>
> Ah, I have not seen this explanation.
>
> However, we cannot let the build fails.
> It is a blocker for patch admission.
>
> Can you, at least, disable the code for some compiler versions?
Hi Jasvinder,
Any chance a work-around for this issue. The default compiler on BSD is clang, and the BSD 10 series of releases uses v3.4. This means this functionality will be unavailable for anyone using DPDK from BSD ports on BSD 10.
/Bruce
next prev parent reply other threads:[~2017-04-05 9:37 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-24 20:54 [dpdk-dev] [PATCH 0/2] " Jasvinder Singh
2017-02-24 20:54 ` [dpdk-dev] [PATCH 1/2] librte_net: add crc init and compute APIs Jasvinder Singh
2017-02-28 12:08 ` [dpdk-dev] [PATCH v2 0/2] librte_net: add crc computation support Jasvinder Singh
2017-02-28 12:08 ` [dpdk-dev] [PATCH v2 1/2] librte_net: add crc init and compute APIs Jasvinder Singh
2017-02-28 12:15 ` Jerin Jacob
2017-03-01 18:46 ` Thomas Monjalon
2017-03-02 13:03 ` Singh, Jasvinder
2017-03-06 15:27 ` Thomas Monjalon
2017-03-08 11:08 ` De Lara Guarch, Pablo
2017-03-15 17:35 ` Thomas Monjalon
2017-03-15 19:03 ` Dumitrescu, Cristian
2017-03-15 20:15 ` Thomas Monjalon
2017-03-15 21:11 ` Dumitrescu, Cristian
2017-03-15 19:09 ` Dumitrescu, Cristian
2017-03-12 21:33 ` [dpdk-dev] [PATCH v3 0/2] librte_net: add crc computation support Jasvinder Singh
2017-03-12 21:33 ` [dpdk-dev] [PATCH v3 1/2] librte_net: add crc compute APIs Jasvinder Singh
2017-03-13 3:06 ` Ananyev, Konstantin
2017-03-13 9:05 ` Singh, Jasvinder
2017-03-20 19:29 ` [dpdk-dev] [PATCH v4 0/2] librte_net: add crc computation support Jasvinder Singh
2017-03-20 19:29 ` [dpdk-dev] [PATCH v4 1/2] librte_net: add crc compute APIs Jasvinder Singh
2017-03-21 14:45 ` [dpdk-dev] [PATCH v5 0/2] librte_net: add crc computation support Jasvinder Singh
2017-03-21 14:45 ` [dpdk-dev] [PATCH v5 1/2] librte_net: add crc compute APIs Jasvinder Singh
2017-03-28 18:04 ` De Lara Guarch, Pablo
2017-03-28 18:07 ` De Lara Guarch, Pablo
2017-03-28 19:21 ` Singh, Jasvinder
2017-03-29 12:42 ` [dpdk-dev] [PATCH v6 0/2] librte_net: add crc computation support Jasvinder Singh
2017-03-29 12:42 ` [dpdk-dev] [PATCH v6 1/2] librte_net: add crc compute APIs Jasvinder Singh
2017-03-29 16:14 ` De Lara Guarch, Pablo
2017-03-29 17:15 ` [dpdk-dev] [PATCH v7 0/2] librte_net: add crc computation support Jasvinder Singh
2017-03-29 17:15 ` [dpdk-dev] [PATCH v7 1/2] librte_net: add crc compute APIs Jasvinder Singh
2017-03-30 11:30 ` [dpdk-dev] [PATCH v8 0/2] librte_net: add crc computation support Jasvinder Singh
2017-03-30 11:30 ` [dpdk-dev] [PATCH v8 1/2] librte_net: add crc compute APIs Jasvinder Singh
2017-03-30 11:31 ` Ananyev, Konstantin
2017-03-30 12:06 ` Singh, Jasvinder
2017-03-30 14:40 ` Olivier Matz
2017-03-30 15:14 ` Singh, Jasvinder
2017-03-30 16:15 ` [dpdk-dev] [PATCH v9 0/3] librte_net: add crc computation support Jasvinder Singh
2017-03-30 16:15 ` [dpdk-dev] [PATCH v9 1/3] librte_net: add crc compute APIs Jasvinder Singh
2017-04-04 20:00 ` Thomas Monjalon
2017-04-05 14:58 ` [dpdk-dev] [PATCH v10 0/2] librte_net: add crc computation support Jasvinder Singh
2017-04-05 14:58 ` [dpdk-dev] [PATCH v10 1/2] librte_net: add crc compute APIs Jasvinder Singh
2017-04-05 17:49 ` Thomas Monjalon
2017-04-05 19:22 ` Singh, Jasvinder
2017-04-05 20:49 ` [dpdk-dev] [PATCH v11 0/2] librte_net: add crc computation support Jasvinder Singh
2017-04-05 20:49 ` [dpdk-dev] [PATCH v11 1/2] librte_net: add crc compute APIs Jasvinder Singh
2017-04-05 20:49 ` [dpdk-dev] [PATCH v11 2/2] test/test: add unit test for CRC computation Jasvinder Singh
2017-04-05 20:59 ` Thomas Monjalon
2017-04-05 21:00 ` [dpdk-dev] [PATCH v11 0/2] librte_net: add crc computation support Thomas Monjalon
2017-04-05 14:58 ` [dpdk-dev] [PATCH v10 2/2] test/test: add unit test for CRC computation Jasvinder Singh
2017-03-30 16:15 ` [dpdk-dev] [PATCH v9 2/3] " Jasvinder Singh
2017-03-30 16:15 ` [dpdk-dev] [PATCH v9 3/3] maintainers: add packet crc section and claim maintainership Jasvinder Singh
2017-04-04 19:55 ` Thomas Monjalon
2017-04-04 20:02 ` [dpdk-dev] [PATCH v9 0/3] librte_net: add crc computation support Thomas Monjalon
2017-04-05 8:34 ` Singh, Jasvinder
2017-04-05 9:01 ` Thomas Monjalon
2017-04-05 9:37 ` Richardson, Bruce [this message]
2017-04-05 12:52 ` Singh, Jasvinder
2017-03-30 11:30 ` [dpdk-dev] [PATCH v8 2/2] test/test: add unit test for CRC computation Jasvinder Singh
2017-03-29 17:15 ` [dpdk-dev] [PATCH v7 " Jasvinder Singh
2017-03-29 12:42 ` [dpdk-dev] [PATCH v6 " Jasvinder Singh
2017-03-29 16:12 ` De Lara Guarch, Pablo
2017-03-21 14:45 ` [dpdk-dev] [PATCH v5 " Jasvinder Singh
2017-03-28 19:23 ` De Lara Guarch, Pablo
2017-03-28 19:27 ` Singh, Jasvinder
2017-03-20 19:29 ` [dpdk-dev] [PATCH v4 2/2] app/test: " Jasvinder Singh
2017-03-21 7:14 ` Peng, Yuan
2017-03-12 21:33 ` [dpdk-dev] [PATCH v3 " Jasvinder Singh
2017-02-28 12:08 ` [dpdk-dev] [PATCH v2 " Jasvinder Singh
2017-02-24 20:54 ` [dpdk-dev] [PATCH " Jasvinder Singh
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