[dpdk-dev] [RFC] ethdev: add new fields for max LRO session size

[Matan Azrad]

Hi Ferruh

From: Ferruh Yigit <ferruh.yigit at intel.com>
> On 8/29/2019 8:47 AM, Matan Azrad wrote:
> > It may be needed by the user to limit the LRO session packet size.
> > In order to allow the above limitation, add new Rx configuration for
> > the maximum LRO session size.
> >
> > In addition, Add a new capability to expose the maximum LRO session
> > size supported by the port.
> >
> > Signed-off-by: Matan Azrad <matan at mellanox.com>
> 
> Hi Matan,
> 
> Is there any existing user of this new field?

All the LRO users need it due to the next reasons:

1. If scatter is enabled - The dpdk user can limit the LRO session size created by the HW by this field, if no field like that - there is no way to limit it.
2. No scatter - the dpdk user may want to limit the LRO packet size in order to save enough tail-room in the mbuf for its own usage.
3. The limitation of max_rx_pkt_len is not enough - doesn't make sense to limit LRO traffic as single packet. 



Matan