> -----Original Message----- > From: Ferruh Yigit <ferruh.yi...@amd.com> > Sent: Wednesday, October 19, 2022 9:47 PM > To: Guo, Junfeng <junfeng....@intel.com>; Zhang, Qi Z > <qi.z.zh...@intel.com>; Wu, Jingjing <jingjing...@intel.com>; Maxime > Coquelin <maxime.coque...@redhat.com>; Xia, Chenbo <chenbo....@intel.com> > Cc: dev@dpdk.org; Li, Xiaoyun <xiaoyun...@intel.com>; > awogbem...@google.com; Richardson, Bruce <bruce.richard...@intel.com>; Lin, > Xueqin <xueqin....@intel.com>; Wang, Haiyue <haiyue.w...@intel.com>; Zhang, > Helin <helin.zh...@intel.com>; Thomas Monjalon <tho...@monjalon.net> > Subject: Re: [PATCH v5 3/8] net/gve: add support for device initialization > > On 10/10/2022 11:17 AM, Junfeng Guo wrote: > > > > > Support device init and add following devops skeleton: > > - dev_configure > > - dev_start > > - dev_stop > > - dev_close > > > > Note that build system (including doc) is also added in this patch. > > > > Signed-off-by: Haiyue Wang <haiyue.w...@intel.com> > > Signed-off-by: Xiaoyun Li <xiaoyun...@intel.com> > > Signed-off-by: Junfeng Guo <junfeng....@intel.com> > > <...> > > > --- /dev/null > > +++ b/doc/guides/nics/gve.rst > > @@ -0,0 +1,63 @@ > > +.. SPDX-License-Identifier: BSD-3-Clause > > + Copyright(C) 2022 Intel Corporation. > > + > > +GVE poll mode driver > > +======================= > > + > > +The GVE PMD (**librte_net_gve**) provides poll mode driver support for > > +Google Virtual Ethernet device (also called as gVNIC). > > + > > This is a virtual device, emulated in VM as PCI device, right?
Most likely yes. But I think this part is not public by Google. (Correct me if I am wrong) > If so what emulates it, I mean can we use QEMU for it? Yes if the user can have a emulated gVNIC device or real HW that supports gVNIC interface. > And is there a kernel supported backend, as virtio has vhost? I guess no if the back-end is not public > > > +Current gVNIC is an alternative to the virtIO-based ethernet interface > that can > > +support higher network bandwidths such as the 50-100 Gbps speeds. > > This is an alternative to virtio, and it would be good to document > pros/cons of this device/approach, to help users to chose one or other. I don't think it's good to compare these two. It's just two virtual interface, I don't see strong analysis to prove which one is better. Like if you use Google cloud, you use gVNIC. Use other cloud that uses virtio, choose virtio. > > Is "support higher network bandwidths" means this device is faster than > virtio? Is there any performance report? > Aren't there any other notable difference? If we want to leave such description, I agree with Ferruh that we need to give some evidence. But in my understanding, they are just two similar virtual interfaces. One has public standard, one is google-specific. Users need to use one of them when they choose to use one cloud service. Thanks, Chenbo > > I think better to document as much as possible, cc'ed more virtio people. >
