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From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: "Gonzalez Monroy, Sergio" <sergio.gonzalez.monroy@intel.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v2 0/2] Removal of RTE_MBUF_REFCNT
Date: Mon, 23 Feb 2015 19:36:46 +0100	[thread overview]
Message-ID: <10033845.zAL0UFbZ4z@xps13> (raw)
In-Reply-To: <2601191342CEEE43887BDE71AB977258213EF713@irsmsx105.ger.corp.intel.com>

> > This patch tries to remove the RTE_MBUF_REFCNT config options and dependencies
> > by introducing a new mbuf flag IND_ATTACHED_MBUF that would indicate when the mbuf
> > is an indirect attached mbuf, to differentiate between indirect mbufs and mbufs
> > with external memory buffers (ie. vhost zero copy).
> > 
> > Previous discussion:
> > http://dpdk.org/ml/archives/dev/2014-October/007127.html
> > 
> > Currently for mbufs with refcnt, we cannot free mbufs with external memory
> > buffers (ie. vhost zero copy), as they are recognized as indirect
> > attached mbufs and therefore we free the direct mbuf it points to,
> > resulting in an error in the case of external memory buffers.
> > 
> > We solve the issue by introducing the IND_ATTACHED_MBUF flag, which indicates
> > that the mbuf is an indirect attached mbuf pointing to another mbuf.
> > When we free an mbuf, we only free the direct mbuf if the flag is set.
> > Freeing an mbuf with external buffer is the same as freeing a non attached mbuf.
> > The flag is set during attach and clear on detach.
> > 
> > So in the case of vhost zero copy where we have mbufs with external
> > buffers, by default we just free the mbuf and it is up to the user to deal with
> > the external buffer.
> > 
> > v2:
> >  - Add missing parenthesis to RTE_MBUF_INDIRECT macro
> > 
> > Sergio Gonzalez Monroy (2):
> >   mbuf: Introduce IND_ATTACHED_MBUF flag
> >   Remove RTE_MBUF_REFCNT references
> 
> Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

Applied, thanks

      reply	other threads:[~2015-02-23 18:37 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-16 16:08 [dpdk-dev] [PATCH " Sergio Gonzalez Monroy
2015-02-16 16:08 ` [dpdk-dev] [PATCH 1/2] mbuf: Introduce IND_ATTACHED_MBUF flag Sergio Gonzalez Monroy
2015-02-16 16:08 ` [dpdk-dev] [PATCH 2/2] Remove RTE_MBUF_REFCNT references Sergio Gonzalez Monroy
2015-02-18  9:16   ` Olivier MATZ
2015-02-18  9:35     ` Bruce Richardson
2015-02-18  9:48       ` Ananyev, Konstantin
2015-02-18 10:00         ` Bruce Richardson
2015-02-18 10:14           ` Olivier MATZ
2015-02-18 10:22             ` Ananyev, Konstantin
2015-02-18 10:22             ` Bruce Richardson
2015-02-18 10:33               ` Olivier MATZ
2015-02-18 10:37                 ` Bruce Richardson
2015-02-18 10:47                   ` Olivier MATZ
2015-02-18 10:47                 ` Ananyev, Konstantin
2015-02-18 11:01                   ` Olivier MATZ
2015-02-18  9:52       ` Olivier MATZ
2015-02-16 20:47 ` [dpdk-dev] [PATCH 0/2] Removal of RTE_MBUF_REFCNT Stephen Hemminger
2015-02-17  8:43   ` Gonzalez Monroy, Sergio
2015-02-18 11:03 ` [dpdk-dev] [PATCH v2 " Sergio Gonzalez Monroy
2015-02-18 11:03   ` [dpdk-dev] [PATCH v2 1/2] mbuf: Introduce IND_ATTACHED_MBUF flag Sergio Gonzalez Monroy
2015-02-18 11:03   ` [dpdk-dev] [PATCH v2 2/2] Remove RTE_MBUF_REFCNT references Sergio Gonzalez Monroy
2015-02-18 12:05   ` [dpdk-dev] [PATCH v2 0/2] Removal of RTE_MBUF_REFCNT Ananyev, Konstantin
2015-02-23 18:36     ` Thomas Monjalon [this message]

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