netdev - [Question/Bug] Should the priority of ip rule be unique?

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Date:	Fri, 8 Jan 2016 14:32:08 +0800
From:	"Hong Hui Xiao" <xiaohhui@...ibm.com>
To:	netdev@...r.kernel.org
Subject: [Question/Bug] Should the priority of ip rule be unique?

Hi,

>From the man page of ip rule at [1], it says that "Each rule should have 
an explicitly set unique priority value." It is reasonable to have unique 
priority for ambiguous rules.
But I have a set of unambiguous ip rules, do I still need to set the 
priority of to be unique? In practice, I can set ip rules with duplicated 
priority, and things works as expected. I want to confirm with iproute 
developers if this is a support usecase. If so, the information in man 
page may need updates.

5000: from all fwmark 0x4000000/0xffff0000 lookup table0 
5000: from all fwmark 0x4010000/0xffff0000 lookup table1 
5000: from all fwmark 0x4020000/0xffff0000 lookup table2 
5000: from all fwmark 0x4030000/0xffff0000 lookup table3 


[1] http://man7.org/linux/man-pages/man8/ip-rule.8.html (search for 
"unique")