Re: [PATCH net-next 2/3] net: mpls: Fixups for GSO

On 8/18/16 8:37 AM, Alexander Duyck wrote:

Thought I would go through and do a second pass since it sounds like
the inner_mac_header idea isn't going to fly.  If we can't push this
as an L2 encapsulation there are few tweaks we probably need in order
to make this work as an L3.  I have included comments inline below.

Also I haven't worked with MPLS much before.  Is there a simple way to
setup an MPLS tunnel between two hosts connected back to back so that
I could try testing a few things related to this patch?

Here commands that I use for VMs - copy and paste. It is an adaptation of Lennert's namespace script. VM id's are local to my host. Network addresses are 10.100.1.x/24 and 2100:1::x/120 on eth1 of the respective node. Includes MPLS encap, IP-IP encap and none to compare performances.

VM2
===
modprobe mpls_router
modprobe mpls_gso
modprobe mpls_iptunnel

sysctl -w net.mpls.platform_labels=1000
ip route add 10.10.10.10/32 encap mpls 100 via inet 10.100.1.3
ip -6 route add 3000:1::1/128 encap mpls 101 via inet6 2100:1::3

ip tunnel add tun0 mode ipip remote 10.100.1.3
ip link set dev tun0 up
ip route add 10.10.10.11/32 dev tun0

ip route add 10.10.10.12/32 via inet 10.100.1.3
ip -6 route add 3000:1::3/128 via inet6 2100:1::3


VM3
===
modprobe mpls_router
modprobe mpls_gso
modprobe mpls_iptunnel

sysctl -w net.mpls.conf.eth1.input=1
sysctl -w net.mpls.platform_labels=1000
ip -f mpls route add 100 via inet 10.100.2.4
ip -f mpls route add 101 via inet6 2100:2::4

ip tunnel add tun0 mode ipip remote 10.100.1.2
ip link set dev tun0 up
ip ro add 10.10.10.11/32 via 10.100.2.4

ip ro add 10.10.10.12/32 via 10.100.2.4
ip -6 route add 3000:1::3/128 via inet6 2100:2::4


VM4
===
ip addr add 10.10.10.10/32 dev lo
ip addr add 10.10.10.11/32 dev lo
ip addr add 10.10.10.12/32 dev lo

ip -6 addr add 3000:1::1/128 dev lo
ip -6 addr add 3000:1::2/128 dev lo
ip -6 addr add 3000:1::3/128 dev lo

netserver


Go back to VM2:

ping -c 1 10.10.10.10
ping -c 1 10.10.10.11
ping -c 1 10.10.10.12

netperf -c -C -H 10.10.10.10  -l 10 -t TCP_STREAM
netperf -c -C -H 10.10.10.11  -l 10 -t TCP_STREAM
netperf -c -C -H 10.10.10.12  -l 10 -t TCP_STREAM


I'll take a look at your other comments today.