2023年2月4日(土) 1:45 Frank Li <frank.li@xxxxxxx>: > > > > > -----Original Message----- > > From: Shunsuke Mie <mie@xxxxxxxxxx> > > Sent: Friday, February 3, 2023 4:04 AM > > To: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx> > > Cc: Krzysztof Wilczyński <kw@xxxxxxxxx>; Manivannan Sadhasivam > > <mani@xxxxxxxxxx>; Kishon Vijay Abraham I <kishon@xxxxxxxxxx>; Bjorn > > Helgaas <bhelgaas@xxxxxxxxxx>; Michael S. Tsirkin <mst@xxxxxxxxxx>; > > Jason Wang <jasowang@xxxxxxxxxx>; Shunsuke Mie <mie@xxxxxxxxxx>; > > Frank Li <frank.li@xxxxxxx>; Jon Mason <jdmason@xxxxxxxx>; Ren Zhijie > > <renzhijie2@xxxxxxxxxx>; Takanari Hayama <taki@xxxxxxxxxx>; linux- > > kernel@xxxxxxxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx; virtualization@lists.linux- > > foundation.org > > Subject: [EXT] [RFC PATCH 0/4] PCI: endpoint: Introduce a virtio-net EP > > function > > > > Caution: EXT Email > > > > This patchset introduce a virtio-net EP device function. It provides a > > new option to communiate between PCIe host and endpoint over IP. > > Advantage of this option is that the driver fully uses a PCIe embedded DMA. > > It is used to transport data between virtio ring directly each other. It > > can be expected to better throughput. > > Thanks, basic that's what I want. I am trying use RDMA. > But I think virtio-net still be good solution. We project extending this module to support RDMA. The plan is based on virtio-rdma[1]. It extends the virtio-net and we are plan to implement the proposed spec based on this patch. [1] virtio-rdma - proposal: https://lore.kernel.org/all/20220511095900.343-1-xieyongji@xxxxxxxxxxxxx/T/ - presentation on kvm forum: https://youtu.be/Qrhv6hC_YK4 Please feel free to comment and suggest. > Frank Li > > > > > To realize the function, this patchset has few changes and introduces a > > new APIs to PCI EP framework related to virtio. Furthermore, it device > > depends on the some patchtes that is discussing. Those depended patchset > > are following: > > - [PATCH 1/2] dmaengine: dw-edma: Fix to change for continuous transfer > > link: > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.k > > ernel.org%2Fdmaengine%2F20221223022608.550697-1- > > mie%40igel.co.jp%2F&data=05%7C01%7CFrank.Li%40nxp.com%7Cac57a62d4 > > 10b458a5ba408db05ce0a4e%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0% > > 7C0%7C638110154722945380%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4 > > wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7 > > C%7C%7C&sdata=tIn0MHzEvrdxaC4KKTvTRvYXBzQ6MyrFa2GXpa3ePv0%3D& > > reserved=0 > > - [RFC PATCH 0/3] Deal with alignment restriction on EP side > > link: > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.k > > ernel.org%2Flinux-pci%2F20230113090350.1103494-1- > > mie%40igel.co.jp%2F&data=05%7C01%7CFrank.Li%40nxp.com%7Cac57a62d4 > > 10b458a5ba408db05ce0a4e%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0% > > 7C0%7C638110154722945380%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4 > > wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7 > > C%7C%7C&sdata=RLpnDiLwfqQd5QMXdiQyPVCkfOj8q2AyVeZOwWHvlsM%3 > > D&reserved=0 > > - [RFC PATCH v2 0/7] Introduce a vringh accessor for IO memory > > link: > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.k > > ernel.org%2Fvirtualization%2F20230202090934.549556-1- > > mie%40igel.co.jp%2F&data=05%7C01%7CFrank.Li%40nxp.com%7Cac57a62d4 > > 10b458a5ba408db05ce0a4e%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0% > > 7C0%7C638110154722945380%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4 > > wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7 > > C%7C%7C&sdata=6jgY76BMSbvamb%2Fl3Urjt4Gcizeqon%2BZE5nPssc2kDA% > > 3D&reserved=0 > > > > About this patchset has 4 patches. The first of two patch is little changes > > to virtio. The third patch add APIs to easily access virtio data structure > > on PCIe Host side memory. The last one introduce a virtio-net EP device > > function. Details are in commit respectively. > > > > Currently those network devices are testd using ping only. I'll add a > > result of performance evaluation using iperf and etc to the future version > > of this patchset. > > > > Shunsuke Mie (4): > > virtio_pci: add a definition of queue flag in ISR > > virtio_ring: remove const from vring getter > > PCI: endpoint: Introduce virtio library for EP functions > > PCI: endpoint: function: Add EP function driver to provide virtio net > > device > > > > drivers/pci/endpoint/Kconfig | 7 + > > drivers/pci/endpoint/Makefile | 1 + > > drivers/pci/endpoint/functions/Kconfig | 12 + > > drivers/pci/endpoint/functions/Makefile | 1 + > > .../pci/endpoint/functions/pci-epf-vnet-ep.c | 343 ++++++++++ > > .../pci/endpoint/functions/pci-epf-vnet-rc.c | 635 ++++++++++++++++++ > > drivers/pci/endpoint/functions/pci-epf-vnet.c | 387 +++++++++++ > > drivers/pci/endpoint/functions/pci-epf-vnet.h | 62 ++ > > drivers/pci/endpoint/pci-epf-virtio.c | 113 ++++ > > drivers/virtio/virtio_ring.c | 2 +- > > include/linux/pci-epf-virtio.h | 25 + > > include/linux/virtio.h | 2 +- > > include/uapi/linux/virtio_pci.h | 2 + > > 13 files changed, 1590 insertions(+), 2 deletions(-) > > create mode 100644 drivers/pci/endpoint/functions/pci-epf-vnet-ep.c > > create mode 100644 drivers/pci/endpoint/functions/pci-epf-vnet-rc.c > > create mode 100644 drivers/pci/endpoint/functions/pci-epf-vnet.c > > create mode 100644 drivers/pci/endpoint/functions/pci-epf-vnet.h > > create mode 100644 drivers/pci/endpoint/pci-epf-virtio.c > > create mode 100644 include/linux/pci-epf-virtio.h > > > > -- > > 2.25.1 > Best, Shunsuke
