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From: Olivier Matz <olivier.matz@6wind.com>
To: Xiaolong Ye <xiaolong.ye@intel.com>
Cc: Thomas Monjalon <thomas@monjalon.net>,
	Konstantin Ananyev <konstantin.ananyev@intel.com>,
	dev@dpdk.org, stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH 3/5] mbuf: fix free_space setting for dynamic field
Date: Thu, 25 Jun 2020 17:53:36 +0200
Message-ID: <20200625155336.GR12564@platinum> (raw)
In-Reply-To: <20200613154922.42379-4-xiaolong.ye@intel.com>

On Sat, Jun 13, 2020 at 11:49:19PM +0800, Xiaolong Ye wrote:
> The value free_space[i] is used to save the size of biggest aligned
> element that can fit in the zone, current implementation has one flaw,
> for example, if user registers dynfield1 (size = 4, align = 4, req = 124)
> first, the free_space would be as below after registration:
> 
>   0070: 08 08 08 08 08 08 08 08
>   0078: 08 08 08 08 00 00 00 00
> 
> Then if user continues to register dynfield2 (size = 4, align = 4),
> free_space would become:
> 
>   0070: 00 00 00 00 04 04 04 04
>   0078: 04 04 04 04 00 00 00 00
> 
> Further request dynfield3 (size = 8, align = 8) would fail to register
> due to alignment requirement can't be satisfied, though there is enough
> space remained in mbuf.
> 
> This patch fixes above issue by saving alignment only in aligned zone,
> after the fix, above registrations order can be satisfied, free_space
> would be like:
> 
> After dynfield1 registration:
> 
>   0070: 08 08 08 08 08 08 08 08
>   0078: 04 04 04 04 00 00 00 00
> 
> After dynfield2 registration:
> 
>   0070: 08 08 08 08 08 08 08 08
>   0078: 00 00 00 00 00 00 00 00
> 
> After dynfield3 registration:
> 
>   0070: 00 00 00 00 00 00 00 00
>   0078: 00 00 00 00 00 00 00 00
> 
> This patch also reduces iterations in process_score() by jumping align
> steps in each loop.
> 
> Fixes: 4958ca3a443a ("mbuf: support dynamic fields and flags")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Xiaolong Ye <xiaolong.ye@intel.com>

Acked-by: Olivier Matz <olivier.matz@6wind.com>

Thanks!

  reply	other threads:[~2020-06-25 15:53 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-13 15:49 [dpdk-dev] [PATCH 0/5] small fixes for mbuf's dynamic field/flag feature Xiaolong Ye
2020-06-13 15:49 ` [dpdk-dev] [PATCH 1/5] mbuf: fix out-of-bounds access at dyn field register Xiaolong Ye
2020-06-13 15:49 ` [dpdk-dev] [PATCH 2/5] mbuf: fix missing errno for dyn field/flag registration Xiaolong Ye
2020-06-25 15:31   ` Olivier Matz
2020-06-13 15:49 ` [dpdk-dev] [PATCH 3/5] mbuf: fix free_space setting for dynamic field Xiaolong Ye
2020-06-25 15:53   ` Olivier Matz [this message]
2020-06-13 15:49 ` [dpdk-dev] [PATCH 4/5] mbuf: fix a dynamic field dump log Xiaolong Ye
2020-06-25 15:54   ` Olivier Matz
2020-06-13 15:49 ` [dpdk-dev] [PATCH 5/5] mbuf: support to dump free_flags for dynamic flag Xiaolong Ye
2020-06-25 15:55   ` Olivier Matz
2020-06-25 20:40 ` [dpdk-dev] [PATCH 0/5] small fixes for mbuf's dynamic field/flag feature Thomas Monjalon

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