[dpdk-dev] vmxnet3 RX VLAN Strip offload incorrect behaviour

[dpdk-dev] vmxnet3 RX VLAN Strip offload incorrect behaviour

[Padam Jeet Singh]

Hi,

When configuring the vmxnet3 based ethernet device, the RX VLAN Strip offload does not work as it usually does with other real NICs which support this function.

When configuring with rxmode.hw_vlan_strip = 1, the ipackets statistic does not increase when a VLAN ether type frame is received on the port and it is also not received on queue RX.
However, when configuring rxmode.hw_vlan_strip = 0 ,the ipackets statistic increases as well as frames arrives with VLAN header.

Though calling  rte_eth_dev_set_vlan_offload(port, ETH_VLAN_STRIP_OFFLOAD) returns a success, however VLAN stripping on RX does not work.

TX VLAN INSERT offload on the other hand works just fine.

Is this a bug in vmxnet3 driver of dpdk?

Thanks,
Padam

Re: [dpdk-dev] vmxnet3 RX VLAN Strip offload incorrect behaviour

[Padam Jeet Singh]

+ Yong Wang - new maintainer for vmxnet3 pod

> On 06-Apr-2018, at 7:21 PM, Padam Jeet Singh <padam.singh@inventum.net> wrote:
> 
> Hi,
> 
> When configuring the vmxnet3 based ethernet device, the RX VLAN Strip offload does not work as it usually does with other real NICs which support this function.
> 
> When configuring with rxmode.hw_vlan_strip = 1, the ipackets statistic does not increase when a VLAN ether type frame is received on the port and it is also not received on queue RX.
> However, when configuring rxmode.hw_vlan_strip = 0 ,the ipackets statistic increases as well as frames arrives with VLAN header.
> 
> Though calling  rte_eth_dev_set_vlan_offload(port, ETH_VLAN_STRIP_OFFLOAD) returns a success, however VLAN stripping on RX does not work.
> 
> TX VLAN INSERT offload on the other hand works just fine.
> 
> Is this a bug in vmxnet3 driver of dpdk?
> 
> Thanks,
> Padam

Re: [dpdk-dev] vmxnet3 RX VLAN Strip offload incorrect behaviour

[Yong Wang]

Padam,

As far as I know, this feature works.  What DPDK version did you use?  Is there any port reconfiguration (stop/start/mtu change, etc) that could lose your vlan offload settings (a dump of the port config at runtime will be able to confirm this)?  Can you also post a snippet of packet capture of the vlan traffic received?

Yong 

On 4/6/18, 6:51 AM, "dev on behalf of Padam Jeet Singh" <dev-bounces@dpdk.org on behalf of padam.singh@inventum.net> wrote:

    Hi,
    
    When configuring the vmxnet3 based ethernet device, the RX VLAN Strip offload does not work as it usually does with other real NICs which support this function.
    
    When configuring with rxmode.hw_vlan_strip = 1, the ipackets statistic does not increase when a VLAN ether type frame is received on the port and it is also not received on queue RX.
    However, when configuring rxmode.hw_vlan_strip = 0 ,the ipackets statistic increases as well as frames arrives with VLAN header.
    
    Though calling  rte_eth_dev_set_vlan_offload(port, ETH_VLAN_STRIP_OFFLOAD) returns a success, however VLAN stripping on RX does not work.
    
    TX VLAN INSERT offload on the other hand works just fine.
    
    Is this a bug in vmxnet3 driver of dpdk?
    
    Thanks,
    Padam

Re: [dpdk-dev] vmxnet3 RX VLAN Strip offload incorrect behaviour

[Padam Jeet Singh]

> On 06-Apr-2018, at 11:12 PM, Yong Wang <yongwang@vmware.com> wrote:
> 
> Padam,
> 
> As far as I know, this feature works.  What DPDK version did you use?

DPDK Version 17.05

>  Is there any port reconfiguration (stop/start/mtu change, etc) that could lose your vlan offload settings (a dump of the port config at runtime will be able to confirm this)?  Can you also post a snippet of packet capture of the vlan traffic received?
> 

It’s a standard configure followed by start. No MTU change/Stop. Here are the port configuration post the device start:

2018-04-09T05:37:45.332573+00:00 INFO inventum fpnas : APP: -- Ethernet Port Info (0) --
2018-04-09T05:37:45.332729+00:00 INFO inventum fpnas : APP:   Driver         net_vmxnet3
2018-04-09T05:37:45.332822+00:00 INFO inventum fpnas : APP:   if_index       0
2018-04-09T05:37:45.332926+00:00 INFO inventum fpnas : APP:   min_rx_bufsize 1646
2018-04-09T05:37:45.333015+00:00 INFO inventum fpnas : APP:   max_rx_pktlen  16384
2018-04-09T05:37:45.333102+00:00 INFO inventum fpnas : APP:   max_rx_queues supported 16
2018-04-09T05:37:45.333218+00:00 INFO inventum fpnas : APP:   max_tx_queues supported 8
2018-04-09T05:37:45.333305+00:00 INFO inventum fpnas : APP:   rx_queues configured 2
2018-04-09T05:37:45.333390+00:00 INFO inventum fpnas : APP:   tx_queues configured 2
2018-04-09T05:37:45.333475+00:00 INFO inventum fpnas : APP:   max_mac_addrs  1
2018-04-09T05:37:45.333560+00:00 INFO inventum fpnas : APP:   max_vfs        0
2018-04-09T05:37:45.333644+00:00 INFO inventum fpnas : APP:   max_vmdq_pools 0
2018-04-09T05:37:45.333728+00:00 INFO inventum fpnas : APP:   rx_offload_cap 29
2018-04-09T05:37:45.333832+00:00 INFO inventum fpnas : APP:   tx_offload_cap 45
2018-04-09T05:37:45.333944+00:00 INFO inventum fpnas : APP:   vlan_offload_flags 1


And the VLAN offload setting while the device is running (with the packet coming from the test PC):

vlan_offload_flag: 1


The configuration as is as follows:

[vmxnet3 based interface on VM with DPDK app] —— [ vswitch with VLAN 4095 and uplink using Intel igb based adaptor] —— [ test PC with VLAN interface ]

Packet sent by the PC (ARP packet):

Frame 1: 46 bytes on wire (368 bits), 46 bytes captured (368 bits)
Ethernet II, Src: 00:25:64:cf:f2:30, Dst: ff:ff:ff:ff:ff:ff
802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 105
Address Resolution Protocol (request)


If I redo the test with the same physical and vmware setup but instead of vmxnet3 I use e1000e emulation driver, all of this works fine. Packets come properly stripped of VLAN with vlan_tci fields set correctly.


> Yong 
> 
> On 4/6/18, 6:51 AM, "dev on behalf of Padam Jeet Singh" <dev-bounces@dpdk.org on behalf of padam.singh@inventum.net> wrote:
> 
>    Hi,
> 
>    When configuring the vmxnet3 based ethernet device, the RX VLAN Strip offload does not work as it usually does with other real NICs which support this function.
> 
>    When configuring with rxmode.hw_vlan_strip = 1, the ipackets statistic does not increase when a VLAN ether type frame is received on the port and it is also not received on queue RX.
>    However, when configuring rxmode.hw_vlan_strip = 0 ,the ipackets statistic increases as well as frames arrives with VLAN header.
> 
>    Though calling  rte_eth_dev_set_vlan_offload(port, ETH_VLAN_STRIP_OFFLOAD) returns a success, however VLAN stripping on RX does not work.
> 
>    TX VLAN INSERT offload on the other hand works just fine.
> 
>    Is this a bug in vmxnet3 driver of dpdk?
> 
>    Thanks,
>    Padam
> 

Re: [dpdk-dev] vmxnet3 RX VLAN Strip offload incorrect behaviour

[Yong Wang]

When using 4095, I assume you enabled trunk mode on ESX vswitch.  What ESX version did you use? Is the vswitch standard switch or DVS? We have tested over ESX6.0 and onwards plus DPDK 17.05 and it should work.

On 4/8/18, 11:22 PM, "Padam Jeet Singh" <padam.singh@inventum.net> wrote:

    
    > On 06-Apr-2018, at 11:12 PM, Yong Wang <yongwang@vmware.com> wrote:
    > 
    > Padam,
    > 
    > As far as I know, this feature works.  What DPDK version did you use?
    
    DPDK Version 17.05
    
    >  Is there any port reconfiguration (stop/start/mtu change, etc) that could lose your vlan offload settings (a dump of the port config at runtime will be able to confirm this)?  Can you also post a snippet of packet capture of the vlan traffic received?
    > 
    
    It’s a standard configure followed by start. No MTU change/Stop. Here are the port configuration post the device start:
    
    2018-04-09T05:37:45.332573+00:00 INFO inventum fpnas : APP: -- Ethernet Port Info (0) --
    2018-04-09T05:37:45.332729+00:00 INFO inventum fpnas : APP:   Driver         net_vmxnet3
    2018-04-09T05:37:45.332822+00:00 INFO inventum fpnas : APP:   if_index       0
    2018-04-09T05:37:45.332926+00:00 INFO inventum fpnas : APP:   min_rx_bufsize 1646
    2018-04-09T05:37:45.333015+00:00 INFO inventum fpnas : APP:   max_rx_pktlen  16384
    2018-04-09T05:37:45.333102+00:00 INFO inventum fpnas : APP:   max_rx_queues supported 16
    2018-04-09T05:37:45.333218+00:00 INFO inventum fpnas : APP:   max_tx_queues supported 8
    2018-04-09T05:37:45.333305+00:00 INFO inventum fpnas : APP:   rx_queues configured 2
    2018-04-09T05:37:45.333390+00:00 INFO inventum fpnas : APP:   tx_queues configured 2
    2018-04-09T05:37:45.333475+00:00 INFO inventum fpnas : APP:   max_mac_addrs  1
    2018-04-09T05:37:45.333560+00:00 INFO inventum fpnas : APP:   max_vfs        0
    2018-04-09T05:37:45.333644+00:00 INFO inventum fpnas : APP:   max_vmdq_pools 0
    2018-04-09T05:37:45.333728+00:00 INFO inventum fpnas : APP:   rx_offload_cap 29
    2018-04-09T05:37:45.333832+00:00 INFO inventum fpnas : APP:   tx_offload_cap 45
    2018-04-09T05:37:45.333944+00:00 INFO inventum fpnas : APP:   vlan_offload_flags 1
    
    
    And the VLAN offload setting while the device is running (with the packet coming from the test PC):
    
    vlan_offload_flag: 1
    
    
    The configuration as is as follows:
    
    [vmxnet3 based interface on VM with DPDK app] —— [ vswitch with VLAN 4095 and uplink using Intel igb based adaptor] —— [ test PC with VLAN interface ]
    
    Packet sent by the PC (ARP packet):
    
    Frame 1: 46 bytes on wire (368 bits), 46 bytes captured (368 bits)
    Ethernet II, Src: 00:25:64:cf:f2:30, Dst: ff:ff:ff:ff:ff:ff
    802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 105
    Address Resolution Protocol (request)
    
    
    If I redo the test with the same physical and vmware setup but instead of vmxnet3 I use e1000e emulation driver, all of this works fine. Packets come properly stripped of VLAN with vlan_tci fields set correctly.
    
    
    > Yong 
    > 
    > On 4/6/18, 6:51 AM, "dev on behalf of Padam Jeet Singh" <dev-bounces@dpdk.org on behalf of padam.singh@inventum.net> wrote:
    > 
    >    Hi,
    > 
    >    When configuring the vmxnet3 based ethernet device, the RX VLAN Strip offload does not work as it usually does with other real NICs which support this function.
    > 
    >    When configuring with rxmode.hw_vlan_strip = 1, the ipackets statistic does not increase when a VLAN ether type frame is received on the port and it is also not received on queue RX.
    >    However, when configuring rxmode.hw_vlan_strip = 0 ,the ipackets statistic increases as well as frames arrives with VLAN header.
    > 
    >    Though calling  rte_eth_dev_set_vlan_offload(port, ETH_VLAN_STRIP_OFFLOAD) returns a success, however VLAN stripping on RX does not work.
    > 
    >    TX VLAN INSERT offload on the other hand works just fine.
    > 
    >    Is this a bug in vmxnet3 driver of dpdk?
    > 
    >    Thanks,
    >    Padam
    > 
    
    

Re: [dpdk-dev] vmxnet3 RX VLAN Strip offload incorrect behaviour

[Padam Jeet Singh]

> On 10-Apr-2018, at 11:43 AM, Yong Wang <yongwang@vmware.com> wrote:
> 
> When using 4095, I assume you enabled trunk mode on ESX vswitch.  What ESX version did you use? Is the vswitch standard switch or DVS? We have tested over ESX6.0 and onwards plus DPDK 17.05 and it should work.

Yes, the 4095 enables trunk mode. ESXi version is "6.0.0 (Build 3620759)”, the switch is a “Standard vSwitch”.

I did a simple change to the standard l2fwd sample application. Then tried the same app once with e1000e emulation driver, and then with the vmxnet3 driver. Patch for changes done to the l2fwd code are available here: https://pastebin.com/0RMJYKr0

The change I did was enable hw_vlan_strip = 1 and also call rte_eth_dev_set_vlan_offload both post configure and post start.

With e1000e driver, sample packets arriving with different VLANs:

mbuff->vlan_tci=500 vlan_tci_outer=0 ethertype=8 
mbuff->vlan_tci=500 vlan_tci_outer=0 ethertype=8 
mbuff->vlan_tci=105 vlan_tci_outer=0 ethertype=8 
mbuff->vlan_tci=100 vlan_tci_outer=0 ethertype=8 


With vmxnet3, packets arriving with different VLANs:

mbuff->vlan_tci=0 vlan_tci_outer=0 ethertype=81 
mbuff->vlan_tci=0 vlan_tci_outer=0 ethertype=81 
mbuff->vlan_tci=0 vlan_tci_outer=0 ethertype=81 
mbuff->vlan_tci=0 vlan_tci_outer=0 ethertype=81 
mbuff->vlan_tci=0 vlan_tci_outer=0 ethertype=81 

the ether type values are not printed byte-swapped …  so it’s 8100 (VLAN) and 0800 (IPv4).




> 
> On 4/8/18, 11:22 PM, "Padam Jeet Singh" <padam.singh@inventum.net> wrote:
> 
> 
>> On 06-Apr-2018, at 11:12 PM, Yong Wang <yongwang@vmware.com> wrote:
>> 
>> Padam,
>> 
>> As far as I know, this feature works.  What DPDK version did you use?
> 
>    DPDK Version 17.05
> 
>> Is there any port reconfiguration (stop/start/mtu change, etc) that could lose your vlan offload settings (a dump of the port config at runtime will be able to confirm this)?  Can you also post a snippet of packet capture of the vlan traffic received?
>> 
> 
>    It’s a standard configure followed by start. No MTU change/Stop. Here are the port configuration post the device start:
> 
>    2018-04-09T05:37:45.332573+00:00 INFO inventum fpnas : APP: -- Ethernet Port Info (0) --
>    2018-04-09T05:37:45.332729+00:00 INFO inventum fpnas : APP:   Driver         net_vmxnet3
>    2018-04-09T05:37:45.332822+00:00 INFO inventum fpnas : APP:   if_index       0
>    2018-04-09T05:37:45.332926+00:00 INFO inventum fpnas : APP:   min_rx_bufsize 1646
>    2018-04-09T05:37:45.333015+00:00 INFO inventum fpnas : APP:   max_rx_pktlen  16384
>    2018-04-09T05:37:45.333102+00:00 INFO inventum fpnas : APP:   max_rx_queues supported 16
>    2018-04-09T05:37:45.333218+00:00 INFO inventum fpnas : APP:   max_tx_queues supported 8
>    2018-04-09T05:37:45.333305+00:00 INFO inventum fpnas : APP:   rx_queues configured 2
>    2018-04-09T05:37:45.333390+00:00 INFO inventum fpnas : APP:   tx_queues configured 2
>    2018-04-09T05:37:45.333475+00:00 INFO inventum fpnas : APP:   max_mac_addrs  1
>    2018-04-09T05:37:45.333560+00:00 INFO inventum fpnas : APP:   max_vfs        0
>    2018-04-09T05:37:45.333644+00:00 INFO inventum fpnas : APP:   max_vmdq_pools 0
>    2018-04-09T05:37:45.333728+00:00 INFO inventum fpnas : APP:   rx_offload_cap 29
>    2018-04-09T05:37:45.333832+00:00 INFO inventum fpnas : APP:   tx_offload_cap 45
>    2018-04-09T05:37:45.333944+00:00 INFO inventum fpnas : APP:   vlan_offload_flags 1
> 
> 
>    And the VLAN offload setting while the device is running (with the packet coming from the test PC):
> 
>    vlan_offload_flag: 1
> 
> 
>    The configuration as is as follows:
> 
>    [vmxnet3 based interface on VM with DPDK app] —— [ vswitch with VLAN 4095 and uplink using Intel igb based adaptor] —— [ test PC with VLAN interface ]
> 
>    Packet sent by the PC (ARP packet):
> 
>    Frame 1: 46 bytes on wire (368 bits), 46 bytes captured (368 bits)
>    Ethernet II, Src: 00:25:64:cf:f2:30, Dst: ff:ff:ff:ff:ff:ff
>    802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 105
>    Address Resolution Protocol (request)
> 
> 
>    If I redo the test with the same physical and vmware setup but instead of vmxnet3 I use e1000e emulation driver, all of this works fine. Packets come properly stripped of VLAN with vlan_tci fields set correctly.
> 
> 
>> Yong 
>> 
>> On 4/6/18, 6:51 AM, "dev on behalf of Padam Jeet Singh" <dev-bounces@dpdk.org on behalf of padam.singh@inventum.net> wrote:
>> 
>>   Hi,
>> 
>>   When configuring the vmxnet3 based ethernet device, the RX VLAN Strip offload does not work as it usually does with other real NICs which support this function.
>> 
>>   When configuring with rxmode.hw_vlan_strip = 1, the ipackets statistic does not increase when a VLAN ether type frame is received on the port and it is also not received on queue RX.
>>   However, when configuring rxmode.hw_vlan_strip = 0 ,the ipackets statistic increases as well as frames arrives with VLAN header.
>> 
>>   Though calling  rte_eth_dev_set_vlan_offload(port, ETH_VLAN_STRIP_OFFLOAD) returns a success, however VLAN stripping on RX does not work.
>> 
>>   TX VLAN INSERT offload on the other hand works just fine.
>> 
>>   Is this a bug in vmxnet3 driver of dpdk?
>> 
>>   Thanks,
>>   Padam
>> 
> 
> 
> 

Re: [dpdk-dev] vmxnet3 RX VLAN Strip offload incorrect behaviour

[Padam Jeet Singh]

Hi,

Does anyone have a work-around for this? Should we debug the vmxnet3 driver since for sure this issue is even coming in standard l2fwd example.

Thanks,
Padam

> On 12-Apr-2018, at 11:52 AM, Padam Jeet Singh <padam.singh@inventum.net> wrote:
> 
> 
> 
>> On 10-Apr-2018, at 11:43 AM, Yong Wang <yongwang@vmware.com> wrote:
>> 
>> When using 4095, I assume you enabled trunk mode on ESX vswitch.  What ESX version did you use? Is the vswitch standard switch or DVS? We have tested over ESX6.0 and onwards plus DPDK 17.05 and it should work.
> 
> Yes, the 4095 enables trunk mode. ESXi version is "6.0.0 (Build 3620759)”, the switch is a “Standard vSwitch”.
> 
> I did a simple change to the standard l2fwd sample application. Then tried the same app once with e1000e emulation driver, and then with the vmxnet3 driver. Patch for changes done to the l2fwd code are available here: https://pastebin.com/0RMJYKr0
> 
> The change I did was enable hw_vlan_strip = 1 and also call rte_eth_dev_set_vlan_offload both post configure and post start.
> 
> With e1000e driver, sample packets arriving with different VLANs:
> 
> mbuff->vlan_tci=500 vlan_tci_outer=0 ethertype=8 
> mbuff->vlan_tci=500 vlan_tci_outer=0 ethertype=8 
> mbuff->vlan_tci=105 vlan_tci_outer=0 ethertype=8 
> mbuff->vlan_tci=100 vlan_tci_outer=0 ethertype=8 
> 
> 
> With vmxnet3, packets arriving with different VLANs:
> 
> mbuff->vlan_tci=0 vlan_tci_outer=0 ethertype=81 
> mbuff->vlan_tci=0 vlan_tci_outer=0 ethertype=81 
> mbuff->vlan_tci=0 vlan_tci_outer=0 ethertype=81 
> mbuff->vlan_tci=0 vlan_tci_outer=0 ethertype=81 
> mbuff->vlan_tci=0 vlan_tci_outer=0 ethertype=81 
> 
> the ether type values are not printed byte-swapped …  so it’s 8100 (VLAN) and 0800 (IPv4).
> 
> 
> 
> 
>> 
>> On 4/8/18, 11:22 PM, "Padam Jeet Singh" <padam.singh@inventum.net> wrote:
>> 
>> 
>>> On 06-Apr-2018, at 11:12 PM, Yong Wang <yongwang@vmware.com> wrote:
>>> 
>>> Padam,
>>> 
>>> As far as I know, this feature works.  What DPDK version did you use?
>> 
>>   DPDK Version 17.05
>> 
>>> Is there any port reconfiguration (stop/start/mtu change, etc) that could lose your vlan offload settings (a dump of the port config at runtime will be able to confirm this)?  Can you also post a snippet of packet capture of the vlan traffic received?
>>> 
>> 
>>   It’s a standard configure followed by start. No MTU change/Stop. Here are the port configuration post the device start:
>> 
>>   2018-04-09T05:37:45.332573+00:00 INFO inventum fpnas : APP: -- Ethernet Port Info (0) --
>>   2018-04-09T05:37:45.332729+00:00 INFO inventum fpnas : APP:   Driver         net_vmxnet3
>>   2018-04-09T05:37:45.332822+00:00 INFO inventum fpnas : APP:   if_index       0
>>   2018-04-09T05:37:45.332926+00:00 INFO inventum fpnas : APP:   min_rx_bufsize 1646
>>   2018-04-09T05:37:45.333015+00:00 INFO inventum fpnas : APP:   max_rx_pktlen  16384
>>   2018-04-09T05:37:45.333102+00:00 INFO inventum fpnas : APP:   max_rx_queues supported 16
>>   2018-04-09T05:37:45.333218+00:00 INFO inventum fpnas : APP:   max_tx_queues supported 8
>>   2018-04-09T05:37:45.333305+00:00 INFO inventum fpnas : APP:   rx_queues configured 2
>>   2018-04-09T05:37:45.333390+00:00 INFO inventum fpnas : APP:   tx_queues configured 2
>>   2018-04-09T05:37:45.333475+00:00 INFO inventum fpnas : APP:   max_mac_addrs  1
>>   2018-04-09T05:37:45.333560+00:00 INFO inventum fpnas : APP:   max_vfs        0
>>   2018-04-09T05:37:45.333644+00:00 INFO inventum fpnas : APP:   max_vmdq_pools 0
>>   2018-04-09T05:37:45.333728+00:00 INFO inventum fpnas : APP:   rx_offload_cap 29
>>   2018-04-09T05:37:45.333832+00:00 INFO inventum fpnas : APP:   tx_offload_cap 45
>>   2018-04-09T05:37:45.333944+00:00 INFO inventum fpnas : APP:   vlan_offload_flags 1
>> 
>> 
>>   And the VLAN offload setting while the device is running (with the packet coming from the test PC):
>> 
>>   vlan_offload_flag: 1
>> 
>> 
>>   The configuration as is as follows:
>> 
>>   [vmxnet3 based interface on VM with DPDK app] —— [ vswitch with VLAN 4095 and uplink using Intel igb based adaptor] —— [ test PC with VLAN interface ]
>> 
>>   Packet sent by the PC (ARP packet):
>> 
>>   Frame 1: 46 bytes on wire (368 bits), 46 bytes captured (368 bits)
>>   Ethernet II, Src: 00:25:64:cf:f2:30, Dst: ff:ff:ff:ff:ff:ff
>>   802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 105
>>   Address Resolution Protocol (request)
>> 
>> 
>>   If I redo the test with the same physical and vmware setup but instead of vmxnet3 I use e1000e emulation driver, all of this works fine. Packets come properly stripped of VLAN with vlan_tci fields set correctly.
>> 
>> 
>>> Yong 
>>> 
>>> On 4/6/18, 6:51 AM, "dev on behalf of Padam Jeet Singh" <dev-bounces@dpdk.org on behalf of padam.singh@inventum.net> wrote:
>>> 
>>>  Hi,
>>> 
>>>  When configuring the vmxnet3 based ethernet device, the RX VLAN Strip offload does not work as it usually does with other real NICs which support this function.
>>> 
>>>  When configuring with rxmode.hw_vlan_strip = 1, the ipackets statistic does not increase when a VLAN ether type frame is received on the port and it is also not received on queue RX.
>>>  However, when configuring rxmode.hw_vlan_strip = 0 ,the ipackets statistic increases as well as frames arrives with VLAN header.
>>> 
>>>  Though calling  rte_eth_dev_set_vlan_offload(port, ETH_VLAN_STRIP_OFFLOAD) returns a success, however VLAN stripping on RX does not work.
>>> 
>>>  TX VLAN INSERT offload on the other hand works just fine.
>>> 
>>>  Is this a bug in vmxnet3 driver of dpdk?
>>> 
>>>  Thanks,
>>>  Padam
>>> 
>> 
>> 
>> 
> 

[dpdk-dev] vmxnet3 RX VLAN Strip offload incorrect behaviour

[Padam Jeet Singh]

When configuring the vmxnet3 based ethernet device, the VLAN Strip RX offload does not work as it usually does with other real NICs.

When configuring with rxmode.hw_vlan_strip = 1, the ipackets statistic does not increase when a VLAN ether type frame is received on the port and it is also not received on queue RX.
However, when configuring rxmode.hw_vlan_strip = 0 ,the ipackets statistic increases as well as frames arrives with VLAN header.

Though calling  rte_eth_dev_set_vlan_offload(port, ETH_VLAN_STRIP_OFFLOAD) returns a success, however VLAN stripping on RX does not work.

TX VLAN INSERT offload on the other hand works just fine.

Is this a bug in vmxnet3 driver of dpdk?

Thanks,
Padam
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