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

[Matan Azrad]

Hi

From: Ferruh Yigit
> On 9/15/2019 8:48 AM, Matan Azrad wrote:
> > 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.
> >
> 
> So should there be more complement patches to this RFC? To update the
> users of the field with the new field.


We already exposed it as ABI breakage in the last deprecation notice.
We probably cannot complete it for 19.11 version, hopefully for 20.02 it will be completed.

Matan