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Date: Fri, 3 Feb 2023 16:45:52 +0000
From: Frank Li <frank.li@....com>
To: Shunsuke Mie <mie@...l.co.jp>,
Lorenzo Pieralisi <lpieralisi@...nel.org>
CC: Krzysztof Wilczyński <kw@...ux.com>,
Manivannan Sadhasivam <mani@...nel.org>,
Kishon Vijay Abraham I <kishon@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>, Jon Mason <jdmason@...zu.us>,
Ren Zhijie <renzhijie2@...wei.com>,
Takanari Hayama <taki@...l.co.jp>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>
Subject: RE: [EXT] [RFC PATCH 0/4] PCI: endpoint: Introduce a virtio-net EP
function
> -----Original Message-----
> From: Shunsuke Mie <mie@...l.co.jp>
> Sent: Friday, February 3, 2023 4:04 AM
> To: Lorenzo Pieralisi <lpieralisi@...nel.org>
> Cc: Krzysztof Wilczyński <kw@...ux.com>; Manivannan Sadhasivam
> <mani@...nel.org>; Kishon Vijay Abraham I <kishon@...nel.org>; Bjorn
> Helgaas <bhelgaas@...gle.com>; Michael S. Tsirkin <mst@...hat.com>;
> Jason Wang <jasowang@...hat.com>; Shunsuke Mie <mie@...l.co.jp>;
> Frank Li <frank.li@....com>; Jon Mason <jdmason@...zu.us>; Ren Zhijie
> <renzhijie2@...wei.com>; Takanari Hayama <taki@...l.co.jp>; linux-
> kernel@...r.kernel.org; linux-pci@...r.kernel.org; virtualization@...ts.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.
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
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