On Sun, Nov 22, 2020 at 10:26:16AM +0000, Alexander Lobakin wrote:
> From: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
> Date: Fri, 20 Nov 2020 13:49:12 +0100
[...]
> > Something like this:
> >
> > fast path
> > .------------------------.
> > / \
> > | IP forwarding |
> > | / \ .
> > | br0 eth0
> > . / \
> > -- veth1 veth2
> > .
> > .
> > .
> > eth0
> > ab:cd:ef:ab:cd:ef
> > VM
>
> I'm concerned about bypassing vlan and bridge's .ndo_start_xmit() in
> case of this shortcut. We'll have incomplete netdevice Tx stats for
> these two, as it gets updated inside this callbacks.
TX device stats are being updated accordingly.
# ip netns exec nsr1 ip -s link
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
RX: bytes packets errors dropped overrun mcast
0 0 0 0 0 0
TX: bytes packets errors dropped carrier collsns
0 0 0 0 0 0
2: veth0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 82:0d:f3:b5:59:5d brd ff:ff:ff:ff:ff:ff link-netns ns1
RX: bytes packets errors dropped overrun mcast
213290848248 4869765 0 0 0 0
TX: bytes packets errors dropped carrier collsns
315346667 4777953 0 0 0 0
3: veth1@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 4a:81:2d:9a:02:88 brd ff:ff:ff:ff:ff:ff link-netns ns2
RX: bytes packets errors dropped overrun mcast
315337919 4777833 0 0 0 0
TX: bytes packets errors dropped carrier collsns
213290844826 4869708 0 0 0 0
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 82:0d:f3:b5:59:5d brd ff:ff:ff:ff:ff:ff
RX: bytes packets errors dropped overrun mcast
4101 73 0 0 0 0
TX: bytes packets errors dropped carrier collsns
5256 74 0 0 0 0
5: veth0.10@veth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UP mode DEFAULT group default qlen 1000
link/ether 82:0d:f3:b5:59:5d brd ff:ff:ff:ff:ff:ff
RX: bytes packets errors dropped overrun mcast
4101 73 0 0 0 62
TX: bytes packets errors dropped carrier collsns
315342363 4777893 0 0 0 0
