[PATCH v2] app/testpmd: use Tx preparation in txonly engine

[Ferruh Yigit]

On 1/11/2024 5:25 AM, Kaiwen Deng wrote:
> Txonly forwarding engine does not call the Tx preparation API
> before transmitting packets. This may cause some problems.
> 
> TSO breaks when MSS spans more than 8 data fragments. Those
> packets will be dropped by Tx preparation API, but it will cause
> MDD event if txonly forwarding engine does not call the Tx preparation
> API before transmitting packets.
> 

txonly is used commonly, adding Tx prepare for a specific case may
impact performance for users.

What happens when driver throws MDD (Malicious Driver Detection) event,
can't it be ignored? As you are already OK to drop the packet, can
device be configured to drop these packages?


Or as Jerin suggested adding a new forwarding engine is a solution, but
that will create code duplication, I prefer to not have it if this can
be handled in device level.