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Date: Thu, 3 Dec 2015 15:03:37 +0530
From: Jerin Jacob <jerin.jacob@caviumnetworks.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>
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Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH 3/4] eal/arm: Enable lpm/table/pipeline libs
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On Wed, Dec 02, 2015 at 05:57:10PM +0100, Thomas Monjalon wrote:
> 2015-12-02 22:23, Jerin Jacob:
> > On Wed, Dec 02, 2015 at 05:40:13PM +0100, Thomas Monjalon wrote:
> > > 2015-12-02 20:04, Jerin Jacob:
> > > > On Wed, Dec 02, 2015 at 09:13:51PM +0800, Jianbo Liu wrote:
> > > > > On 2 December 2015 at 18:39, Jerin Jacob <jerin.jacob@caviumnetworks.com> wrote:
> > > > > > AND they include "rte_lpm.h"(it internally includes rte_vect.h)
> > > > > > that lead to multiple definition and its not good.
> > > > > >
> > > > > But you will have similar issue since "typedef int32x4_t __m128i"
> > > > > appears in both your patch and this header file.
> > > >
> > > > I just tested it, it won't break, back to back "typedef int32x4_t __m128i"
> > > > is fine(unlike inline function).
> > > >
> > > > my intention to keep __m128i "as is" because changing the __m128i to rte_???
> > > > something would break the ABI.
> > >
> > > Isn't it already broken in 2.2?
> >
> > Does it mean, You would like to have rte_128i(or similar) kind of
> > abstraction to represent 128bit SIMD variable in DPDK?
>
> If you are convinced that it is the best way to write a generic code, yes.
I grep-ed through DPDK API list to see the dependency with SIMD in API
definition.I see only rte_lpm_lookupx4 API has SIMD dependency in API
definition.
I believe that's the root cause of the problem. IMO, The
better way to fix this would be to remove __m128i from API and have more
general representation to remove the architecture dependency from API
something like this,
rte_lpm_lookupx4(const struct rte_lpm *lpm, uint32_t *ip, uint16_t
hop[4], uint16_t defv)
instead of
rte_lpm_lookupx4(const struct rte_lpm *lpm, __m128i ip, uint16_t
hop[4], uint16_t defv)
Now I am not sure why this API was created like this, from l3fwd.c
example, it looks to accommodate the IPV4 byte swap[1]. If it's true,
maybe we can have eal byte swap abstraction for optimized byte swap on
memory for 4 IP address in one shot
or
Have rte_lpm_lookupx4 take an argument for byte swap or not ?
or
something similar?
Thoughts ?
[1]
const __m128i bswap_mask = _mm_set_epi8(12, 13, 14, 15, 8, 9, 10, 11,
4, 5, 6, 7, 0, 1, 2, 3);
/* Byte swap 4 IPV4 addresses. */
dip = _mm_shuffle_epi8(dip, bswap_mask);
Jerin
> I think the most important question is to know what is the best solution
> for performance and maintainability. The API/ABI questions will be considered
> after.
>
> Thanks for your involvement guys.