[RFC] net/vhost: support asynchronous data path

[Maxime Coquelin]

Hi,

On 1/6/23 10:08, Wang, YuanX wrote:
> Hi Maxime,
> 
> Sorry about not being clear about the intentions.
> The patch is for a whitepaper, we use it for tests and we need to attach the patch link.

Thanks for the clarification.

> Maybe I should set the patch state to superseded?

I think setting it to rejected would be the appropriate state, as there
are no patch that supersedes it.

Thanks,
Maxime

> Thanks,
> Yuan
> 
>> -----Original Message-----
>> From: Maxime Coquelin <maxime.coquelin at redhat.com>
>> Sent: Monday, January 2, 2023 6:59 PM
>> To: Wang, YuanX <yuanx.wang at intel.com>; dev at dpdk.org
>> Cc: Hu, Jiayu <jiayu.hu at intel.com>
>> Subject: Re: [RFC] net/vhost: support asynchronous data path
>>
>> Hi Yuan,
>>
>> On 12/16/22 03:00, Yuan Wang wrote:
>>> Vhost asynchronous data-path offloads packet copy from the CPU to the
>>> DMA engine. As a result, large packet copy can be accelerated by the
>>> DMA engine, and vhost can free CPU cycles for higher level functions.
>>>
>>> In this patch, we enable asynchronous data-path for vhostpmd.
>>> Asynchronous data path is enabled per tx/rx queue, and users need to
>>> specify the DMA device used by the tx/rx queue. Each tx/rx queue only
>>> supports to use one DMA device, but one DMA device can be shared
>> among
>>> multiple tx/rx queues of different vhost PMD ports.
>>>
>>> Two PMD parameters are added:
>>> - dmas:	specify the used DMA device for a tx/rx queue.
>>> 	(Default: no queues enable asynchronous data path)
>>> - dma-ring-size: DMA ring size.
>>> 	(Default: 4096).
>>>
>>> Here is an example:
>>> --vdev
>> 'eth_vhost0,iface=./s0,dmas=[txq0 at 0000:00.01.0;rxq0 at 0000:00.01.1],dma-
>> ring-size=4096'
>>>
>>> Signed-off-by: Jiayu Hu <jiayu.hu at intel.com>
>>> Signed-off-by: Yuan Wang <yuanx.wang at intel.com>
>>> Signed-off-by: Wenwu Ma <wenwux.ma at intel.com>
>>> ---
>>>    drivers/net/vhost/meson.build     |   1 +
>>>    drivers/net/vhost/rte_eth_vhost.c | 512
>> ++++++++++++++++++++++++++++--
>>>    drivers/net/vhost/rte_eth_vhost.h |  15 +
>>>    drivers/net/vhost/version.map     |   7 +
>>>    drivers/net/vhost/vhost_testpmd.c |  67 ++++
>>>    5 files changed, 569 insertions(+), 33 deletions(-)
>>>    create mode 100644 drivers/net/vhost/vhost_testpmd.c
>>>
>>
>> This RFC is identical to the v5 that you sent for last release, and so the
>> comments I made on it are still valid.
>>
>> Is this intentionally re-sent?
>>
>> Regards,
>> Maxime
>