[dpdk-dev] Passing VLAN traffic via l2fwd

[James Yu]

I could not pass tagged traffic through the l2fwd program running inside a
CentOS VM. The l2fwd program reported sending out all the packets received
from one port to the other port. But the outside Spirent tester could not
receive a packet at all. I am wondering maybe the tagged packets are
dropped somewhere in the rte_em_pmd or in the DPDK library. Anyone knows
how to pass/send VLAN traffic through the DPDK ?

With tagged SR-IOV ports, Spirent and guest VM CentOS could ping each other
without using DPDK. Once I used DPDK 1.3.1r2, I encountered issues with
sending out tagged packets out of DPDK to the host.

I have done the following:

On RHEL6.1 host
1. setup the VLAN using "ip link set eth2 vf 0 vlan 3" for port 1 and "ip
link set eth3 vf 0 vlan 3" for port 2
[root at cent64x64-137189 ~]# ip link show eth2
96: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen
1000
    link/ether 90:e2:ba:2e:af:f0 brd ff:ff:ff:ff:ff:ff
    vf 0 MAC 52:54:00:f9:9a:90, vlan 3
[root at cent64x64-137189 ~]# ip link show eth3
98: eth3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen
1000
    link/ether 90:e2:ba:2e:af:f1 brd ff:ff:ff:ff:ff:ff
    vf 0 MAC 52:54:00:30:37:98, vlan 3

2. virsh configure SR-IOV hostdev
    <interface type='hostdev' managed='yes'>
      <mac address='52:54:00:f9:9a:90'/>
      <source>
        <address type='pci' domain='0x0000' bus='0x1a' slot='0x10'
function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08'
function='0x0'/>
    </interface>
    <interface type='hostdev' managed='yes'>
      <mac address='52:54:00:30:37:98'/>
      <source>
        <address type='pci' domain='0x0000' bus='0x1a' slot='0x10'
function='0x1'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x09'
function='0x0'/>
    </interface>

[root at cent64x64-137189 ~]# lspci |grep Eth
1a:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+
Network Connection (rev 01)
1a:00.1 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+
Network Connection (rev 01)
1a:10.0 Ethernet controller: Intel Corporation 82599 Ethernet Controller
Virtual Function (rev 01)
1a:10.1 Ethernet controller: Intel Corporation 82599 Ethernet Controller
Virtual Function (rev 01)


On guest VM
1. check all the ports are started up and check their corresponding port
type. Use the two SR-IOV ports with device type as ixgbevf  for l2fwd
[root at VirtualADX ~]# lspci |grep Eth
00:03.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet
Controller (rev 03)
00:07.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet
Controller (rev 03)
00:08.0 Ethernet controller: Intel Corporation 82599 Ethernet Controller
Virtual Function (rev 01)
00:09.0 Ethernet controller: Intel Corporation 82599 Ethernet Controller
Virtual Function (rev 01)
00:0a.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet
Controller (rev 03)

2. run this command:
           /root/l2fwd -c 3 -n 1 -b 000:00:03.0  -b 000:00:07.0 -b
000:00:0a.0 -- -q 1 -p 3

    Although the l2fwd forwards all received tagged packets, the Spirent
tester did not receive any packet at all.