linux-kernel - Re: PROBLEM: net: qede: QL41262 unable to TX packets with multiple VLAN tags

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Message-ID:
 <LO4P123MB4995BFCDA6A7CFCA8850BC52CAAFA@LO4P123MB4995.GBRP123.PROD.OUTLOOK.COM>
Date: Sat, 13 Dec 2025 14:15:49 +0000
From: Joseph Bywater <joseph@...rigued.uk>
To: Joseph Bywater <joseph@...rigued.uk>, Manish Chopra <manishc@...vell.com>,
	Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo
 Abeni <pabeni@...hat.com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: PROBLEM: net: qede: QL41262 unable to TX packets with multiple
 VLAN tags

Hi,

I'm still seeing this issue, would someone be able to look at this, and let me know if it's intentional behaviour?

Thanks,
Joe

________________________________________
From: Joseph Bywater <joseph@...rigued.uk>
Sent: 15 September 2025 21:16
To: Manish Chopra <manishc@...vell.com>; Andrew Lunn <andrew+netdev@...n.ch>; David S. Miller <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org <netdev@...r.kernel.org>; linux-kernel@...r.kernel.org <linux-kernel@...r.kernel.org>
Subject: PROBLEM: net: qede: QL41262 unable to TX packets with multiple VLAN tags

Hi,

I have been having a problem with a QLogic QL41262 NIC (using the qede driver)
that is unable to TX packets with more than one VLAN tag. RX works fine,
even with more than 2 VLAN tags applied.

I set up a test with two servers, one with an Intel NIC (ixgbe, .101),
and the other with the QL41262 (qede, .102). I created interfaces on each server as follows:

ip link add link eth0 eth0.10 type vlan id 10
ip link add link eth0.10 eth0.10.20 type vlan id 20
ip addr add 10.50.10.<101-102>/24 dev eth0.10
ip addr add 10.50.20.<101-102>/24 dev eth0.10.20
ip link set up eth0
ip link set up eth0.10
ip link set up eth0.10.20

I then attempted to ping from the Intel server to the QLogic:

ping 10.50.10.102 (single VLAN tag) -> works
ping 10.50.20.102 (double VLAN tag) -> does not work

In the failing case, with two VLANs, I can see the generated ARP response
using tcpdump from eth0.10.20 down to the eth0 interface.
However, I do not receive this ARP packet on the server with the Intel NIC,
and the packet counters on the switch do not increase.

Here is a truncated output from ethtool:
rx-vlan-offload: on [fixed]
tx-vlan-offload: on [fixed]
rx-vlan-filter: on [fixed]
vlan-challenged: off [fixed]
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]

I have tested this on 6.8.0-79-generic, Ubuntu 24.04.
Additionally, I tested a similar setup with other NICs, which worked without issue (drivers listed):
- mlx5_core
- ixgbe
- ice

Is this a known limitation of QLogic NICs? If not, are you able to
advise on further tests I may be able to perform?

Thanks,
Joe