netdev - Re: [RFC PATCH net-next 0/3] L3 RX handler

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Date:	Sun, 30 Aug 2015 21:59:23 -0600
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Shrijeet Mukherjee <shm@...ulusnetworks.com>
Subject: Re: [RFC PATCH net-next 0/3] L3 RX handler

Hi Tom:

On 8/29/15 12:02 PM, Tom Herbert wrote:
> To begin with, can we abstract out the need for common code to know
> about the VRF device (netif_index_is_vrf). Looking more closely at
> udp_semdmsg code, there's seems to be some potential problems:

My intention to address your udp_sendmsg comment is to rip out the 
change that was added and set the source address in the VRF device 
driver. Doing so ...

>
> 1) In the VRF case route lookup is being called twice for every
> unconnected packet when going through vrf path :-(
> 2) The "unconnected socket" comment is not incorrect, this path is
> taken for connected sockets also before there is a cache route
> 3) Looks like in VRF path the source address can be arbitrarily
> overwritten in the case that it is non-zero (that is non-zero, but not
> a connect socket).

... fixes the above problems for non-VRF users completely. VRF users 
will still have multiple lookups but that is by design.

David


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