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From: Stanislaw Kardach <kda@semihalf.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
Cc: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	"Richardson, Bruce" <bruce.richardson@intel.com>,
	"Yigit, Ferruh" <ferruh.yigit@intel.com>,
	Stephen Hemminger <stephen@networkplumber.org>,
	Jerin Jacob <jerinjacobk@gmail.com>,
	Kathleen Capella <Kathleen.Capella@arm.com>,
	"thomas@monjalon.net" <thomas@monjalon.net>,
	"dev@dpdk.org" <dev@dpdk.org>,
	Dharmik Thakkar <Dharmik.Thakkar@arm.com>,
	Ruifeng Wang <Ruifeng.Wang@arm.com>,
	"david.marchand@redhat.com" <david.marchand@redhat.com>,
	"jerinj@marvell.com" <jerinj@marvell.com>,
	"hemant.agrawal@nxp.com" <hemant.agrawal@nxp.com>,
	Stephen Hemminger <sthemmin@microsoft.com>, nd <nd@arm.com>
Subject: Re: [dpdk-dev] L3fwd mode in testpmd
Date: Thu, 29 Apr 2021 12:39:22 +0200	[thread overview]
Message-ID: <20210429103922.7jw2e24qemsd4y3y@toster> (raw)
In-Reply-To: <DM6PR11MB4491DE19612B33348F21B95B9A5F9@DM6PR11MB4491.namprd11.prod.outlook.com>

On Thu, Apr 29, 2021 at 08:31:03AM +0000, Ananyev, Konstantin wrote:
> Hi Stanislaw,
> 
> > 
> > On Wed, Apr 28, 2021 at 09:44:54PM +0000, Honnappa Nagarahalli wrote:
> > <snip>
> > > [Honnappa] Sorry, I do not understand this. I see that vector code is under compile time flag as below
> > >
> > > #if defined RTE_ARCH_X86 || defined __ARM_NEON
> > >                         l3fwd_em_send_packets(nb_rx, pkts_burst,
> > >                                                         portid, qconf);
> > > #else
> > >                        l3fwd_em_no_opt_send_packets(nb_rx, pkts_burst,
> > >                                                         portid, qconf);
> > > #endif
> > Take a look at the ifdef tree at the top of l3fwd_em.c, here:
> > http://git.dpdk.org/dpdk/tree/examples/l3fwd/l3fwd_em.c#n218
> > 
> > #if defined(__SSE2__)
> > ...
> > #else
> > #error No vector engine (SSE, NEON, ALTIVEC) available, check your toolchain
> > #endif
> > 
> 
> I think it is just a flaw and needs to be fixed.
> Patch would help here 😊
> Konstantin

It looks as if implementing em_mask_key() is enough to get l3fwd
working. However to me this ifdef seems tricky. How should a scalar
implementation handle the xmm_t type? rte_xmm_t looks like an API
type/union, but both are not mentioned in documentation and are in
platform dependent rte_vect.h only.
So either I add another case for RISC-V or (what seems more proper) add
an else clause implementation. However then should I change this function
to take rte_xmm_t? If not is casting xmm_t to i.e. int32_t[] always
valid? Even if I change to rte_xmm_t, it's not a stable API type, is it?
So what guarantee do I have that it maps to int32_t bit-wise on every
platform?

I think the semantic requirements of xmm_t typedef are a bit undefined as
well as the vector handling across the architectures (being something
rather arch specific). I don't have a clear idea on how to solve this
yet and I would not like to hijack this discussion with vector stuff.

Though I may be missing some obvious solution here. Any idea is welcome.
:)

-- 
Best Regards,
Stanislaw Kardach

  reply	other threads:[~2021-04-29 10:39 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-10 18:31 Honnappa Nagarahalli
2021-03-11  6:41 ` Jerin Jacob
2021-03-11 15:18   ` Honnappa Nagarahalli
2021-03-11 15:46     ` Thomas Monjalon
2021-03-11 16:00       ` Honnappa Nagarahalli
2021-03-31 20:35         ` Kathleen Capella
2021-03-31 21:17           ` Jerin Jacob
2021-04-01  0:20             ` Honnappa Nagarahalli
2021-04-01  4:38               ` Jerin Jacob
2021-04-24  0:26                 ` Honnappa Nagarahalli
2021-04-26  9:44                   ` Jerin Jacob
2021-04-26 17:47                     ` Stephen Hemminger
2021-04-26 20:46                       ` Honnappa Nagarahalli
2021-04-27  9:39                         ` Andrew Rybchenko
2021-04-27  9:50                         ` Ferruh Yigit
2021-04-27  9:57                           ` Ananyev, Konstantin
2021-04-27 11:11                             ` Thomas Monjalon
2021-04-27 11:32                               ` Bruce Richardson
2021-04-27 23:26                                 ` Honnappa Nagarahalli
2021-04-27 23:17                             ` Honnappa Nagarahalli
2021-04-28 10:48                               ` Bruce Richardson
2021-04-28 11:04                                 ` Stanisław Kardach
2021-04-28 11:19                                   ` Thomas Monjalon
2021-04-28 21:44                                   ` Honnappa Nagarahalli
2021-04-29  7:49                                     ` Stanislaw Kardach
2021-04-29  8:31                                       ` Ananyev, Konstantin
2021-04-29 10:39                                         ` Stanislaw Kardach [this message]
2021-04-29 11:47                                           ` Ananyev, Konstantin
2021-04-29 11:53                                             ` Stanislaw Kardach
2021-04-30 11:28                                               ` Ananyev, Konstantin
2021-08-02 15:07                                                 ` Dharmik Thakkar
2021-04-28 11:17                                 ` Thomas Monjalon
2021-04-28 10:59                               ` Ananyev, Konstantin
2021-04-28 22:10                                 ` Honnappa Nagarahalli
2021-04-27 16:01                           ` Stephen Hemminger
2021-04-27 20:20                             ` Honnappa Nagarahalli
2021-04-27 22:23                               ` Ananyev, Konstantin
2021-04-27 23:11                                 ` Honnappa Nagarahalli
2021-04-28 11:00                                   ` Ananyev, Konstantin
2021-04-26 20:32                     ` Honnappa Nagarahalli

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