[meta-freescale] meta-fsl-ppc: questioning reason to disable reverse path filtering...

[zhenhua.luo at freescale.com]

Since the RP_FILTER options only influence the ASF performance, ASF is disabled by default, so the procps bbappend can be removed to enable the RP_FILTER options by default. 

The ASF document needs to be updated to tell users to disable RP_FILTER options when using ASF. 


Best Regards,

Zhenhua

> -----Original Message-----
> From: meta-freescale-bounces at yoctoproject.org [mailto:meta-freescale-
> bounces at yoctoproject.org] On Behalf Of Bob Cochran
> Sent: Tuesday, December 02, 2014 12:02 PM
> To: Liu Ting-B28495; Malik Sandeep-B02416
> Cc: meta-freescale at yoctoproject.org
> Subject: Re: [meta-freescale] meta-fsl-ppc: questioning reason to disable
> reverse path filtering...
> 
> On 12/01/2014 09:38 PM, ting.liu at freescale.com wrote:
> > Hi Bob,
> >
> > You are right. Below is the answer from Sandeep (added in):
> >
> > "The RP_FILTER issues are specific to AS_FASTPATH and with current ASF
> implementation the RP_FILTER needs to be disabled. Since the ASF is disabled
> by default so the RP_FILTER can be enabled by default and the same can be
> disabled when someone enables the AS_FASTPATH."
> >
> 
> 
> Thank you Ting.  What is the right way to patch this?  Can we remove the
> procps bbappend and add something to AS_FASTPATH Kconfig help as I had
> proposed?
> 
> If not, please propose what you would like to see.
> 
> 
> > -Ting
> >
> >> -----Original Message-----
> >> From: meta-freescale-bounces at yoctoproject.org [mailto:meta-freescale-
> >> bounces at yoctoproject.org] On Behalf Of Bob Cochran
> >> Sent: Sunday, November 30, 2014 3:06 AM
> >> To: meta-freescale at yoctoproject.org
> >> Subject: [meta-freescale] meta-fsl-ppc: questioning reason to disable
> >> reverse path filtering...
> >>
> >> Hi,
> >>
> >> Reverse Path filtering (RPF) is disabled by meta-fsl-ppc/recipes-
> >> extended/procps_%.bbappend.
> >>
> >> The git log states: "rp_filter causes issues with VLAN interfaces."
> >>
> >> An email patch for procps from FSL back on 3/7/13 states:
> >>
> >> "disable rp_filter to enhance ASF IP forward performance, which is
> >> really fsl SDK specific."
> >>
> >> Are both of these statements true?
> >>
> >> If so, it looks like AS_FASTPATH is almost always disabled by default
> >> in the powerpc defconfigs.  Therefore, if reverse path filtering
> >> issues are specific to AS_FASTPATH, I suggest RPF shouldn't be disabled by
> default.
> >>    Perhaps add a comment in the drivers/net/Kconfig help for
> >> AS_FASTPATH that if AS_FASTPATH is enabled, then disable RPF.
> >>
> >> Regardless, can we get a description added to this recipe append file to
> >> document why it exists?   And if there is no need to disable RPF in
> >> default configurations, can we just get rid of it?
> >>
> >> Thanks
> >>
> >> Bob
> >>
> >>
> >>
> >>
> >>
> >>
> >> --
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> >
> 
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