From: Olivier Matz <olivier.matz@6wind.com>
To: Zoltan Kiss <zoltan.kiss@schaman.hu>, dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] mempool: adjust name string size in related data types
Date: Tue, 19 Jul 2016 17:37:28 +0200 [thread overview]
Message-ID: <600cac7d-b0aa-7919-93f2-7a396ef7b3ea@6wind.com> (raw)
In-Reply-To: <1468939061-19734-2-git-send-email-zoltan.kiss@schaman.hu>
Hi Zoltan,
On 07/19/2016 04:37 PM, Zoltan Kiss wrote:
> A recent fix brought up an issue about the size of the 'name' fields:
>
> 85cf0079 mem: avoid memzone/mempool/ring name truncation
>
> These relations should be observed:
>
> RTE_RING_NAMESIZE <= RTE_MEMZONE_NAMESIZE - strlen(RTE_RING_MZ_PREFIX)
> RTE_MEMPOOL_NAMESIZE <= RTE_RING_NAMESIZE - strlen(RTE_MEMPOOL_MZ_PREFIX)
>
> Setting all of them to 32 hides this restriction from the application.
> This patch increases the memzone string size to accomodate for these
> prefixes, and the same happens with the ring name string. The ABI needs to
> be broken to fix this API issue, this way doesn't break applications
> previously not failing due to the truncating bug now fixed.
>
> Signed-off-by: Zoltan Kiss <zoltan.kiss@schaman.hu>
I agree it is a problem for an application because it cannot know what
is the maximum name length. On the other hand, breaking the ABI for this
looks a bit overkill. Maybe we could reduce RTE_MEMPOOL_NAMESIZE and
RTE_RING_NAMESIZE instead of increasing RTE_MEMZONE_NAMESIZE? That way,
we could keep the ABI as is.
It would even be better to get rid of this static char[] for the
structure names and replace it by an allocated const char *. I didn't
check it's feasible for memzones. What do you think?
In any case, I think it's a bit late for 16.07 for this kind of fix.
Regards,
Olivier
next prev parent reply other threads:[~2016-07-19 15:37 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-19 14:37 [dpdk-dev] [PATCH] mempool: fix lack of free() registration Zoltan Kiss
2016-07-19 14:37 ` [dpdk-dev] [PATCH] mempool: adjust name string size in related data types Zoltan Kiss
2016-07-19 15:37 ` Olivier Matz [this message]
2016-07-19 15:59 ` Zoltan Kiss
2016-07-19 16:17 ` Olivier Matz
2016-07-20 12:41 ` Zoltan Kiss
2016-07-20 13:37 ` Olivier Matz
2016-07-20 14:01 ` Richardson, Bruce
2016-07-20 17:20 ` Zoltan Kiss
2016-07-20 17:16 ` [dpdk-dev] [PATCH v2] " Zoltan Kiss
2016-07-21 13:40 ` Olivier Matz
2016-07-21 13:47 ` Zoltan Kiss
2016-07-21 14:25 ` Olivier Matz
2016-07-21 21:16 ` Thomas Monjalon
2016-07-19 15:26 ` [dpdk-dev] [PATCH] mempool: fix lack of free() registration Olivier Matz
2016-07-19 16:17 ` Zoltan Kiss
2016-07-20 17:14 ` [dpdk-dev] [PATCH v2] mempool: fix lack of free registration Zoltan Kiss
2016-07-21 21:04 ` Thomas Monjalon
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