Re: E810 VLAN offload wrong behavior

[Ivan Malov <ivan.malov@arknetworks.am>]

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Hi Ernesto,

On Fri, 11 Jul 2025, Ernesto Ruffini wrote:

> 
> Hi,
> 
> We found a strange behavior of the E810 VLAN offload.
> 
> We are running DPDK 24.11.2 with ice driver 1.15.4, firmware 4.60 and COMMS DDP 1.3.46
> 
>  
> 
> The NIC receives an IPv4/UDP packet inside VLAN 300.
> 
> If we run dpdk-testpmd with a single queue, everything seems fine:
> 
>  
> 
> dpdk-testpmd -a 0000:4b:00.0 -c ffffff -n 8 -- -i
> 
>  
> 
> set verbose 5
> 
> port stop 0
> 
> port config 0 rx_offload vlan_strip on
> 
> port start 0
> 
> start
> 
>  
> 
> And the packet is correctly displayed:
> 
>   src=08:02:03:04:05:06 - dst=00:1A:CA:01:00:96 - pool=mb_pool_0 - type=0x0800 - length=142 - nb_segs=1 - VLAN tci=0x12c - hw ptype: L2_ETHER L3_IPV4_EXT_UNKNOWN L4_UDP  - sw ptype:
> L2_ETHER L3_IPV4 L4_UDP  - l2_len=14 - l3_len=20 - l4_len=8 - Destination UDP port=5398 - Receive queue=0x0
> 
>   ol_flags: RTE_MBUF_F_RX_VLAN RTE_MBUF_F_RX_L4_CKSUM_GOOD RTE_MBUF_F_RX_IP_CKSUM_GOOD RTE_MBUF_F_RX_VLAN_STRIPPED RTE_MBUF_F_RX_OUTER_L4_CKSUM_GOOD
> 
>  
> 
> But if we use a different number of queues:
> 
>  
> 
> dpdk-testpmd -a 0000:4b:00.0 -c ffffff -n 8 -- -i --rxq=4 --txq=4

It would be helpful to enable debug logs with EAL argument --log-level='.*',8
so that one can see which 'rx_pkt_burst' method gets selected by the driver.
Then one can inspect the implementation of that particular function to see
whether offloads are handled correctly.

Thank you.

> 
>  
> 
> The VLAN is in fact removed, but there is no evidence of that:
> 
>  
> 
>   src=08:02:03:04:05:06 - dst=00:1A:CA:01:00:96 - pool=mb_pool_0 - type=0x0800 - length=142 - nb_segs=1 - RSS hash=0xfae3080 - RSS queue=0x0 - hw ptype: L2_ETHER L3_IPV4_EXT_UNKNOWN
> L4_UDP  - sw ptype: L2_ETHER L3_IPV4 L4_UDP  - l2_len=14 - l3_len=20 - l4_len=8 - Destination UDP port=5398 - Receive queue=0x0
> 
>   ol_flags: RTE_MBUF_F_RX_RSS_HASH RTE_MBUF_F_RX_L4_CKSUM_GOOD RTE_MBUF_F_RX_IP_CKSUM_GOOD RTE_MBUF_F_RX_OUTER_L4_CKSUM_GOOD
> 
>  
> 
> There was a bug in some previous versions of DPDK about E810 and VLAN offload, but it was fixed.
> 
> Are we doing something wrong or is there a problem with the driver?
> 
>  
> 
> Thank you
> 
>                Ernesto
> 
>  
> 
> 
>