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

Ferruh Yigit ferruh.yigit at intel.com
Mon Sep 16 17:37:56 CEST 2019


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.


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