This is a note to let you know that I've just added the patch titled
ixgbe: fix unexpected VLAN Rx in promisc mode on VF
to the 5.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ixgbe-fix-unexpected-vlan-rx-in-promisc-mode-on-vf.patch
and it can be found in the queue-5.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7bb0fb7c63df95d6027dc50d6af3bc3bbbc25483 Mon Sep 17 00:00:00 2001
From: Olivier Matz <olivier.matz@xxxxxxxxx>
Date: Wed, 6 Apr 2022 11:52:52 +0200
Subject: ixgbe: fix unexpected VLAN Rx in promisc mode on VF
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
From: Olivier Matz <olivier.matz@xxxxxxxxx>
commit 7bb0fb7c63df95d6027dc50d6af3bc3bbbc25483 upstream.
When the promiscuous mode is enabled on a VF, the IXGBE_VMOLR_VPE
bit (VLAN Promiscuous Enable) is set. This means that the VF will
receive packets whose VLAN is not the same than the VLAN of the VF.
For instance, in this situation:
┌────────┐ ┌────────┐ ┌────────┐
│ │ │ │ │ │
│ │ │ │ │ │
│ VF0├────┤VF1 VF2├────┤VF3 │
│ │ │ │ │ │
└────────┘ └────────┘ └────────┘
VM1 VM2 VM3
vf 0: vlan 1000
vf 1: vlan 1000
vf 2: vlan 1001
vf 3: vlan 1001
If we tcpdump on VF3, we see all the packets, even those transmitted
on vlan 1000.
This behavior prevents to bridge VF1 and VF2 in VM2, because it will
create a loop: packets transmitted on VF1 will be received by VF2 and
vice-versa, and bridged again through the software bridge.
This patch remove the activation of VLAN Promiscuous when a VF enables
the promiscuous mode. However, the IXGBE_VMOLR_UPE bit (Unicast
Promiscuous) is kept, so that a VF receives all packets that has the
same VLAN, whatever the destination MAC address.
Fixes: 8443c1a4b192 ("ixgbe, ixgbevf: Add new mbox API xcast mode")
Cc: stable@xxxxxxxxxxxxxxx
Cc: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Signed-off-by: Olivier Matz <olivier.matz@xxxxxxxxx>
Tested-by: Konrad Jankowski <konrad0.jankowski@xxxxxxxxx>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
@@ -1181,9 +1181,9 @@ static int ixgbe_update_vf_xcast_mode(st
return -EPERM;
}
- disable = 0;
+ disable = IXGBE_VMOLR_VPE;
enable = IXGBE_VMOLR_BAM | IXGBE_VMOLR_ROMPE |
- IXGBE_VMOLR_MPE | IXGBE_VMOLR_UPE | IXGBE_VMOLR_VPE;
+ IXGBE_VMOLR_MPE | IXGBE_VMOLR_UPE;
break;
default:
return -EOPNOTSUPP;
Patches currently in stable-queue which might be from olivier.matz@xxxxxxxxx are
queue-5.17/ixgbe-fix-unexpected-vlan-rx-in-promisc-mode-on-vf.patch
queue-5.17/ixgbe-fix-bcast-packets-rx-on-vf-after-promisc-removal.patch
