Re: [dpdk-dev] [PATCH] mbuf: clean old refcnt option

["Ouyang, Changchun" <changchun.ouyang@intel.com>]

Hi Thomas,

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> Sent: Thursday, April 2, 2015 3:58 AM
> To: Xie, Huawei; Ouyang, Changchun
> Cc: Olivier MATZ; dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] mbuf: clean old refcnt option
> 
> 2015-03-31 21:26, Olivier MATZ:
> > Hi Thomas,
> >
> > On 03/31/2015 07:58 PM, Thomas Monjalon wrote:
> > > CONFIG_RTE_MBUF_SCATTER_GATHER was renamed into
> > > CONFIG_RTE_MBUF_REFCNT by commit 62814bc2e923 and removed by
> commit 4769bc5a27cc.
> > > Some traces remain because of delayed patches.
> > >
> > > It can also be removed from doxygen config.
> > > It is now poisoned in rte_mbuf.h to warn any misuse.
> > >
> > > Fixes: d0dff9ba445e ("doc: sample application user guide")
> > > Fixes: fc1f2750a3ec ("doc: programmers guide")
> > > Fixes: 4769bc5a27cc ("mbuf: remove build option to disable refcnt")
> > >
> > > Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
> [...]
> > > --- a/doc/guides/sample_app_ug/vhost.rst
> > > +++ b/doc/guides/sample_app_ug/vhost.rst
> > > @@ -338,28 +338,6 @@ Compiling the Sample Code
> > >
> > >      .. code-block:: console
> > >
> > > -        make
> > > -
> > > -    .. note::
> > > -
> > > -        Note For zero copy, need firstly disable
> CONFIG_RTE_MBUF_SCATTER_GATHER,
> > > -        CONFIG_RTE_LIBRTE_IP_FRAG and
> CONFIG_RTE_LIBRTE_DISTRIBUTOR
> > > -        in the config file and then re-configure and compile the core lib, and
> then build the application:
> > > -
> > > -    .. code-block:: console
> > > -
> > > -        vi ${RTE_SDK}/config/common_linuxapp
> > > -
> > > -    change it as follows:
> > > -
> > > -    ::
> > > -
> > > -        CONFIG_RTE_MBUF_SCATTER_GATHER=n
> > > -        CONFIG_RTE_LIBRTE_IP_FRAG=n
> > > -        CONFIG_RTE_LIBRTE_DISTRIBUTOR=n
> > > -
> > > -    .. code-block:: console
> > > -
> > >          cd ${RTE_SDK}
> > >          make config ${RTE_TARGET}
> > >          make install ${RTE_TARGET}
> 
> Note that make config is useless and T= is missing.
> 
> > I have one doubt about the vhost part, as the previous doc was telling
> > to disable refcnt option and now the behavior is equivalent to having
> > the option always enabled. Also you are removing parts of doc that
> > talk about CONFIG_RTE_LIBRTE_DISTRIBUTOR and
> CONFIG_RTE_LIBRTE_IP_FRAG.
> >
> > It would be safer to also have an acknowledgment from a vhost expert.
> 
> Huawei, Changchun, any opinion please?

Ok to remove it from vhost user doc as the macro in code is removed.
Thanks
Changchun