[PATCH v4 2/3] common/sfc_efx/base: add support to enable VLAN stripping
Artemii Morozov
Artemii.Morozov at arknetworks.am
Thu Jun 8 13:16:51 CEST 2023
Hello,
On 6/2/23 12:32, Andrew Rybchenko wrote:
> On 6/1/23 18:30, Artemii Morozov wrote:
>> To enable VLAN stripping, two conditions must be met:
>> the corresponding flag must be set and the appropriate
>> RX prefix should be requested.
>
> RX -> Rx
>
>> VLAN stripping is supported for ef100 datapath only.
>
> When you read below notes carefully, you'll understand that the
> patch is very raw yet. There are too many questions below.
>
> The major decision to be made is if libefx API should enforce
> device level offload or should just provide transparent API and
> driver must be responsible for consistency.
>
> If driver must be responsible for consistency, don't try to
> enforce VLAN stripping enable via filter table. RxQ flags
> should control stripped VLAN delivery. Filter flag and default
> RxQ set flag (API should be extended) should control VLAN
> stripping enabling.
>
> If libefx must guarantee consistency, we need a new way to
> enable device level offload early (efx_rx_init()-like, may
> be a new API). If so, it should be impossible to control
> VLAN stripping per Rx filter. It still could be possible
> to control stripped VLAN delivery per RxQ.
>
> Anyway current solution is really inconsistent.
How about the following concept:
1. Add a new negotiated flag for metadata: RTE_ETH_RX_METADATA_VLAN_INFO.
2. Extend the driver to allow requesting the delivery of stripped VLAN
TCI through the metadata
negotiation method. This request will internally affect the Rx
prefix configuration via
libefx EFX_RXQ_FLAG_VLAN_TCI (or something like that).
3. Set the corresponding boolean flag in the sfc_port(strip_vlan =
something like that please advice)
structure if RTE_ETH_RX_OFFLOAD_VLAN_STRIP is received. Map this
flag to the corresponding flag in
efx_nic_t, Then, when generating specs for filters, use the
boolean flag from efx_nic_t to determine
the VLAN stripping behavior.
4. Users can request VLAN strip action. If a user does not request this
action, but the driver detects that
device-level stripping has been requested, it may implicitly enable
VLAN stripping for that specific flow
within the efx_mcdi_filter_op_add function.
In this concept, we allow the enabling of device-level VLAN stripping.
Points 1 and 2 concern the delivery of stripped VLAN TCI, while points 3
and 4 pertain to the request for VLAN tag stripping.
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