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

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