[PATCH net 0/2] ixgbe: fix promiscuous mode on VF

[PATCH net 0/2] ixgbe: fix promiscuous mode on VF

[Olivier Matz]

These 2 patches fix issues related to the promiscuous mode on VF.

Comments are welcome,
Olivier

Cc: stable@vger.kernel.org
Cc: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>

Olivier Matz (2):
  ixgbe: fix bcast packets Rx on VF after promisc removal
  ixgbe: fix unexpected VLAN Rx in promisc mode on VF

 drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

-- 
2.30.2

[PATCH net 1/2] ixgbe: fix bcast packets Rx on VF after promisc removal

[Olivier Matz]

After a VF requested to remove the promiscuous flag on an interface, the
broadcast packets are not received anymore. This breaks some protocols
like ARP.

In ixgbe_update_vf_xcast_mode(), we should keep the IXGBE_VMOLR_BAM
bit (Broadcast Accept) on promiscuous removal.

This flag is already set by default in ixgbe_set_vmolr() on VF reset.

Fixes: 8443c1a4b192 ("ixgbe, ixgbevf: Add new mbox API xcast mode")
Cc: stable@vger.kernel.org
Cc: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
index 7f11c0a8e7a9..8d108a78941b 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
@@ -1184,9 +1184,9 @@ static int ixgbe_update_vf_xcast_mode(struct ixgbe_adapter *adapter,
 
 	switch (xcast_mode) {
 	case IXGBEVF_XCAST_MODE_NONE:
-		disable = IXGBE_VMOLR_BAM | IXGBE_VMOLR_ROMPE |
+		disable = IXGBE_VMOLR_ROMPE |
 			  IXGBE_VMOLR_MPE | IXGBE_VMOLR_UPE | IXGBE_VMOLR_VPE;
-		enable = 0;
+		enable = IXGBE_VMOLR_BAM;
 		break;
 	case IXGBEVF_XCAST_MODE_MULTI:
 		disable = IXGBE_VMOLR_MPE | IXGBE_VMOLR_UPE | IXGBE_VMOLR_VPE;
-- 
2.30.2

[PATCH net 2/2] ixgbe: fix unexpected VLAN Rx in promisc mode on VF

[Olivier Matz]

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@vger.kernel.org
Cc: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
index 8d108a78941b..d4e63f0644c3 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
@@ -1208,9 +1208,9 @@ static int ixgbe_update_vf_xcast_mode(struct ixgbe_adapter *adapter,
 			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;
-- 
2.30.2

Re: [PATCH net 0/2] ixgbe: fix promiscuous mode on VF

[Olivier Matz]

Hi,

On Fri, Mar 25, 2022 at 03:02:48PM +0100, Olivier Matz wrote:
> These 2 patches fix issues related to the promiscuous mode on VF.
> 
> Comments are welcome,
> Olivier
> 
> Cc: stable@vger.kernel.org
> Cc: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
> Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
> 
> Olivier Matz (2):
>   ixgbe: fix bcast packets Rx on VF after promisc removal
>   ixgbe: fix unexpected VLAN Rx in promisc mode on VF
> 
>  drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

Sorry, the intel-wired-lan mailing list was not CC'ed initially.

Please let me know if I need to resend the patchset.

Thanks,
Olivier

Re: [Intel-wired-lan] [PATCH net 0/2] ixgbe: fix promiscuous mode on VF

[Paul Menzel]

Dear Olivier,


Am 06.04.22 um 10:18 schrieb Olivier Matz:

> On Fri, Mar 25, 2022 at 03:02:48PM +0100, Olivier Matz wrote:
>> These 2 patches fix issues related to the promiscuous mode on VF.
>>
>> Comments are welcome,
>> Olivier
>>
>> Cc: stable@vger.kernel.org
>> Cc: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
>> Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
>>
>> Olivier Matz (2):
>>    ixgbe: fix bcast packets Rx on VF after promisc removal
>>    ixgbe: fix unexpected VLAN Rx in promisc mode on VF
>>
>>   drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 8 ++++----
>>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> Sorry, the intel-wired-lan mailing list was not CC'ed initially.
> 
> Please let me know if I need to resend the patchset.

Yes, please resend.


Kind regards,

Paul