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Tue, 16 Jun 2020 12:12:32 -0400 (EDT)
From: Thomas Monjalon <thomas@monjalon.net>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: Yipeng Wang <yipeng1.wang@intel.com>,
Sameh Gobriel <sameh.gobriel@intel.com>,
Bruce Richardson <bruce.richardson@intel.com>, dev@dpdk.org,
honnappa.nagarahalli@arm.com, pablo.de.lara.guarch@intel.com
Date: Tue, 16 Jun 2020 18:12:30 +0200
Message-ID: <1609609.4PBobdEyhI@thomas>
In-Reply-To: <20200605113508.746ba6b2@hermes.lan>
References: <20200604171731.6738-1-stephen@networkplumber.org>
<20200605113508.746ba6b2@hermes.lan>
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Subject: Re: [dpdk-dev] [PATCH] hash: document breakage with multi-writer
thread
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05/06/2020 20:35, Stephen Hemminger:
> On Thu, 4 Jun 2020 10:17:31 -0700
> Stephen Hemminger <stephen@networkplumber.org> wrote:
>
> > The code in rte_cuckoo_hash multi-writer support is broken if write
> > operations are called from a non-EAL thread.
> >
> > rte_lcore_id() wil return LCORE_ID_ANY (UINT32_MAX) for non EAL
> > thread and that leads to using wrong local cache.
> >
> > Add error checks and document the restriction.
> >
> > Fixes: 9d033dac7d7c ("hash: support no free on delete")
> > Fixes: 5915699153d7 ("hash: fix scaling by reducing contention")
> > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> > Cc: honnappa.nagarahalli@arm.com
> > Cc: pablo.de.lara.guarch@intel.com
>
> This restriction also needs to be added to the known issues
> section of EAL
Are you going to send a v2 adding doc?