[PATCH v2] net/ice: support double vlan

[Xu, Ke1]

> From: Mingjin Ye <mingjinx.ye at intel.com>
> Sent: Saturday, May 6, 2023 6:05 PM
> To: dev at dpdk.org
> Cc: Yang, Qiming <qiming.yang at intel.com>; Zhou, YidingX
> <yidingx.zhou at intel.com>; Ye, MingjinX <mingjinx.ye at intel.com>; Zhang, Qi Z
> <qi.z.zhang at intel.com>
> Subject: [PATCH v2] net/ice: support double vlan
> 
> Aligned with kernel driver, optimized for inner and outer VLAN handling in DPDK,
> and implemented double vlan insertion and stripping support.
> NIC must work in double vlan mode(DVM), depending on FW/SW.
> 
> 1. Adjust vlan stripping
> The vlan stripping enable/disable is applied to the inner vlan.
> 
> 2. Support QinQ stripping
> The ice outer vlan strip is enabled/disabled by the mask bit of
> `RTE_ETH_RX_OFFLOAD_QINQ_STRIP`, and the user can use "vlan set qinq_strip
> on 0" to enable or "vlan setqinq_strip off 0" to disable the ice outer vlan strip in
> testpmd.
> 
> 3. Support outer tag type switching
> Implement the ethdev `vlan_tpid_set` api to enable outer tag support to handle
> `RTE_ETHER_TYPE_VLAN`` RTE_ETHER_TYPE_QINQ`` RTE_ETHER_TYPE_QINQ1`
> outer tag types.
> 
> 4. Support outer port-based vlan insertion Implement port-based outer vlan
> insertion. User can use "tx_vlan set pvid 0 45 on" to enable or "tx_vlan set pvid 0
> 45 off" to disable the outer vlan insertion in testpmd.
> 
> Signed-off-by: Mingjin Ye <mingjinx.ye at intel.com>

Tested and passed.

There are several points need to be mentioned.
1. Only Scalar path is implemented, needs force-max-simd-bitwidth.
2. Not supported: StripQ.
3. Hardware limitation: Requires different outer and inner VLAN type. It means
  setting outer TPID to 0x88a8 before double VLAN insert.
4. Undefined behaviour: VLAN insert and TPID configured together is not defined
  in this new feature. TPID is designed to work with PVID now. Under this implementation
  changing TPID would not change the TX outer VLAN type of double VLAN insert.

Tested-by: Ke Xu <ke1.xu at intel.com>

> ---
> v2: Apply QinQ when initializing vlan offload.
> ---
>  drivers/net/ice/ice_ethdev.c | 422 +++++++++++++++++++++++++++++++++--
>  drivers/net/ice/ice_ethdev.h |   1 +
>  2 files changed, 408 insertions(+), 15 deletions(-)
>