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

Bob Cochran yocto at mindchasers.com
Sat Nov 29 11:06:22 PST 2014


Reverse Path filtering (RPF) is disabled by 

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?



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