[PATCH v5] net/vhost: support asynchronous data path

[Wang, YuanX]

Hi Chenbo,

> -----Original Message-----
> From: Xia, Chenbo <chenbo.xia at intel.com>
> Sent: Monday, October 24, 2022 5:03 PM
> To: Wang, YuanX <yuanx.wang at intel.com>; Maxime Coquelin
> <maxime.coquelin at redhat.com>
> Cc: dev at dpdk.org; Hu, Jiayu <jiayu.hu at intel.com>; Jiang, Cheng1
> <cheng1.jiang at intel.com>; Ma, WenwuX <wenwux.ma at intel.com>; He,
> Xingguang <xingguang.he at intel.com>
> Subject: RE: [PATCH v5] net/vhost: support asynchronous data path
> 
> Hi Yuan,
> 
> > -----Original Message-----
> > From: Wang, YuanX <yuanx.wang at intel.com>
> > Sent: Monday, October 24, 2022 11:15 PM
> > To: Maxime Coquelin <maxime.coquelin at redhat.com>; Xia, Chenbo
> > <chenbo.xia at intel.com>
> > Cc: dev at dpdk.org; Hu, Jiayu <jiayu.hu at intel.com>; Jiang, Cheng1
> > <cheng1.jiang at intel.com>; Ma, WenwuX <wenwux.ma at intel.com>; He,
> > Xingguang <xingguang.he at intel.com>; Wang, YuanX
> <yuanx.wang at intel.com>
> > Subject: [PATCH v5] net/vhost: support asynchronous data path
> >
> > 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>
> >
> 
> Sorry that I just realize that we need to change release notes because this is
> new feature for vhost PMD. Please mention the async support and new
> driver api you added.

Sure, will update docs in new version.

Thanks,
Yuan

> 
> Thanks,
> Chenbo