Date:   Fri, 4 Sep 2020 11:25:27 +0200
From:   MyNet SysAdmin <sysadmin@...et.it>
To:     netdev@...r.kernel.org
Subject: Fwd: PROBLEM: QinQ not working with qlcnic drivers

*[1.] One line summary of the problem:*

QinQ not working with qlcnicdrivers

*[2.] Full description of the problem/report:*

QinQ networking operations don’t happenproperly: a QinQ message can be 
received by the NIC and a correct outputgetsgenerated by the server but 
the QinQ encapsulation for the responsedoesnot take place.

tcpdump output statesthat the packet has both first and second tagbut 
further analysis on the traffic using a switch and a sniffer (monitoring 
the port with the SPANfunction on a cisco switch)makes it clear that the 
packet travels tagged only with the second tag (the first is not 
present)andnot double tagged.


*[3.]* *Keywords (i.e., modules, networking, kernel):*

networking, QinQ, qlcnic, vlan, nic, driver, HP, 802.1q

*[4.] Kernel information*

5.8.5 generic

*[4.1.]* *Kernel version (from /proc/version):*

Linux version 5.8.5-050805-generic (kernel@...gerine)
(gcc (Ubuntu 10.2.0-5ubuntu2) 10.2.0, GNU ld (GNU Binutils for Ubuntu) 
2.35) #202008270831 SMP Thu Aug 27 08:33:39 UTC 2020

*[4.2.] Kernel .config file: _see attached_ “config.txt”*

*[5.] Most recent kernel version which did not have the bug: *

not known

*[6.] Output of Oops.. message (if applicable) with symbolic information 
resolved (see Documentation/admin-guide/bug-hunting.rst)*

not applicable

*[7.] A small shell script or example program which triggers the problem 
(if possible)*

ip link add link enp11s0f1 name v.4 type vlan id 4000
ip link add link v.4 name v.4.3 type vlan id 3999
ip a a 172.20.20.5/24 dev v.4.3
ping 172.20.20.1

*[8.] Environment*
HP proLiant rackmount server model DL360e Gen8;
HP NC523SFP / QLE3242-CU(Qlogic clom8214controller)NIC;
CISCO switch with a monitor port set on the server’s NIC;
sniffer on the monitor port;

*[8.1.] Software (add the output of the ver_linux script here): see 
attached “ver_linux.txt”*

*[8.2.] Processor information (from /proc/cpuinfo): _see attached_ 
“proc-cpuinfo.txt”*

*[8.3.] Module information (from /proc/modules): see attached 
“proc-modules.txt”*

*[8.4.] Loaded driver and hardware information (/proc/ioports, 
/proc/iomem): see attached “iomem.txt” and “ioports.txt”*

*[8.5.] PCI information ('lspci -vvv' as root): see attached “lspci.txt”*

*[8.6.] SCSI information (from /proc/scsi/scsi): see attached 
“proc-scsi-scsi.txt”*

*[8.7.] Other information that might be relevant to the problem*
        *(please look in /proc and include all information that you*
        *think to be relevant):*

this is the output of ethtool -i for the interface

driver: qlcnic
version: 5.3.66
firmware-version: 4.14.26
expansion-rom-version:
bus-info: 0000:03:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no

The server is connected to a switch through the NC523SFP,the other end 
of the communication is another server, proven to work as intended with 
QinQ by a test made with a third device and the same switch.
The same configuration used for the NC523SFP is proven to work with the 
other end of the communication using the integrated ethernet NIC.
Along with the other information there’s a file called monitor.pcap that 
is the capture taken from the switch, of the problemand also a file 
called host.pcap that is the output of tcpdump done on the host.

*[**9**.] Other notes, patches, fixes, workarounds:*

the same setup has been tested with kernels:

5.0.0-38
5.4.0-050400
5.4.0-45
5.4.7-050407
5.8.5-050805

none of them worked. Best regards, Luca Garusi.


View attachment "config.txt" of type "text/plain" (247246 bytes)

View attachment "ethtool.txt" of type "text/plain" (228 bytes)

View attachment "iomem.txt" of type "text/plain" (4258 bytes)

View attachment "ioports.txt" of type "text/plain" (1763 bytes)

View attachment "lspci.txt" of type "text/plain" (119762 bytes)

Download attachment "monitor.pcap" of type "application/vnd.tcpdump.pcap" (328 bytes)

View attachment "proc-cpuinfo.txt" of type "text/plain" (14466 bytes)

View attachment "proc-modules.txt" of type "text/plain" (4391 bytes)

View attachment "proc-scsi-scsi.txt" of type "text/plain" (495 bytes)

View attachment "ver_linux.txt" of type "text/plain" (1456 bytes)

Download attachment "host.pcap" of type "application/vnd.tcpdump.pcap" (354 bytes)

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