On 4/3/18 9:15 PM, Md. Islam wrote:
>> Have you looked at what I would consider a more interesting use case of
>> packets into a node and delivered to a namespace via veth?
>>
>> +--------------------------+---------------
>> | Host | container
>> | |
>> | +-------{ veth1 }-|-{veth2}----
>> | | |
>> +----{ eth1 }------------------
>>
>> Can xdp / bpf on eth1 be used to speed up delivery to the container?
>
> I didn't consider that, but it sounds like an important use case. How
> do we determine which namespace gets the packet?
>
FIB lookups of course. Starting with my patch set that handles
forwarding on eth1, what is needed for XDP with veth? ie., a program on
eth1 does the lookup and redirects the packet to veth1 for Tx.
ndo_xdp_xmit for veth knows the packet needs to be forwarded to veth2
internally and there is no skb allocated for the packet yet.
