Hi Raj,
A sub-interface with "dot1q inner any" can only work with L2 forwarding via
cross-connect or bridging where packets are forwarded using MAC header without
any changes to MAC header nor VLAN IDs in VLAN tags.
For L3 IP forwarding, any VLAN tags on a packet must be exact match to a
sub-interface which means both outer and inner VLAN tag IDs must be
exact-matched to specific values defined of that sub-interface. Without exact
match on a L3 sub-interface, VPP has no mechanism to know what VLAN tags to use
for packet output, such as ARP request packets or IP packets, on that
sub-interface. Thus, sub-interface with "inner-dot1q any" is not an exact match
sub-interface by definition since no match is present on inner tag.
I suppose the CLI:
>> create sub-interfaces GigabitEthernet3/0/3 50 dot1ad 50 inner-dot1q any
>> exact-match
should have been rejected as exact match cannot be supported on the
sub-interface. This is something we should ideally fix in the CLI to avoid any
confusion with the meaning of exact match.
Regards,
John
-----Original Message-----
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Raj
Sent: Tuesday, December 17, 2019 4:39 AM
To: vpp-dev <vpp-dev@lists.fd.io>
Subject: [vpp-dev] QinQ and dot1ad any
Hello all,
When an interface is created using a command like:
create sub-interfaces GigabitEthernet3/0/3 50 dot1ad 50 inner-dot1q any
exact-match
I can see that dual tagged packets with outer vlan 50 will be accepted by that
interface.
But how does a packet goes out from this interface? Is there a means by which I
can say that a given IP is with a specific S_VLAN:C_VLAN?
During testing VPP could receive an ARP packet, but when it sends it out,
entire Ethernet header was missing. I guess there must be some means to add
adjacency information so that correct headers can be added.
The trace is as follows:
00:01:04:749110: dpdk-input
GigabitEthernet3/0/3 rx queue 0
buffer 0x4c7d: current data 0, length 60, free-list 0, clone-count 0,
totlen-nifb 0, trace 0x1
ext-hdr-valid
l4-cksum-computed l4-cksum-correct
PKT MBUF: port 0, nb_segs 1, pkt_len 60
buf_len 2176, data_len 60, ol_flags 0x180, data_off 128, phys_addr
0x26b31fc0
packet_type 0x0 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0
rss 0x0 fdir.hi 0x0 fdir.lo 0x0
Packet Offload Flags
PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid
PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid
ARP: 40:7b:1b:00:11:aa -> ff:ff:ff:ff:ff:ff 802.1ad vlan 50 802.1ad vlan 51
request, type ethernet/IP4, address size 6/4
40:7b:1b:00:11:aa/192.168.25.1 -> 00:00:00:00:00:00/192.168.25.2
00:01:04:749112: ethernet-input
frame: flags 0x3, hw-if-index 1, sw-if-index 1
ARP: 40:7b:1b:00:11:aa -> ff:ff:ff:ff:ff:ff 802.1ad vlan 50 802.1ad vlan 51
00:01:04:749113: arp-input
request, type ethernet/IP4, address size 6/4
40:7b:1b:00:11:aa/192.168.25.1 -> 00:00:00:00:00:00/192.168.25.2
00:01:04:749116: GigabitEthernet3/0/3-output
GigabitEthernet3/0/3.50
0x1235: 00:02:40:7b:1b:00 -> 00:01:08:00:06:04
00:01:04:749116: GigabitEthernet3/0/3-tx
GigabitEthernet3/0/3 tx queue 0
buffer 0x4c7d: current data 22, length 38, free-list 0, clone-count 0,
totlen-nifb 0, trace 0x1
ext-hdr-valid
l4-cksum-computed l4-cksum-correct vlan-2-deep l2-hdr-offset 0
l3-hdr-offset 22
PKT MBUF: port 0, nb_segs 1, pkt_len 38
buf_len 2176, data_len 38, ol_flags 0x180, data_off 150, phys_addr
0x26b31fc0
packet_type 0x0 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0
rss 0x0 fdir.hi 0x0 fdir.lo 0x0
Packet Offload Flags
PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid
PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid
0x1235: 00:02:40:7b:1b:00 -> 00:01:08:00:06:04
btw, if inner VLAN is specified, everything works fine.
Thanks and Regards,
Raj
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