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Date: Sat, 5 Sep 2020 15:08:12 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Kishon Vijay Abraham I <kishon@...com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Jonathan Corbet <corbet@....net>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Jon Mason <jdmason@...zu.us>,
Dave Jiang <dave.jiang@...el.com>,
Allen Hubbe <allenbh@...il.com>, Rob Herring <robh@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Tom Joseph <tjoseph@...ence.com>, linux-pci@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-ntb@...glegroups.com
Subject: Re: [PATCH v3 17/17] Documentation: PCI: Add userguide for PCI
endpoint NTB function
On 9/4/20 12:50 AM, Kishon Vijay Abraham I wrote:
> Add documentation to help users use pci-epf-ntb function driver and
> existing host side NTB infrastructure for NTB functionality.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
> Documentation/PCI/endpoint/index.rst | 1 +
> Documentation/PCI/endpoint/pci-ntb-howto.rst | 160 +++++++++++++++++++
> 2 files changed, 161 insertions(+)
> create mode 100644 Documentation/PCI/endpoint/pci-ntb-howto.rst
Hi,
There are a few edits below:
> diff --git a/Documentation/PCI/endpoint/pci-ntb-howto.rst b/Documentation/PCI/endpoint/pci-ntb-howto.rst
> new file mode 100644
> index 000000000000..2fbb0a051c3b
> --- /dev/null
> +++ b/Documentation/PCI/endpoint/pci-ntb-howto.rst
> @@ -0,0 +1,160 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +======================
> +PCI NTB EPF User Guide
> +======================
> +
> +:Author: Kishon Vijay Abraham I <kishon@...com>
> +
> +This document is a guide to help users use pci-epf-ntb function driver
> +and ntb_hw_epf host driver for NTB functionality. The list of steps to
> +be followed in the host side and EP side is given below. For the hardware
> +configuration and internals of NTB using configurable endpoints see
> +Documentation/PCI/endpoint/pci-ntb-function.rst
> +
> +Endpoint Device
> +===============
> +
> +Endpoint Controller Devices
> +---------------------------
> +
> +For implementing NTB functionality atleast two endpoint controller devices
at least
> +are required.
> +To find the list of endpoint controller devices in the system::
> +
> + # ls /sys/class/pci_epc/
> + 2900000.pcie-ep 2910000.pcie-ep
> +
> +If PCI_ENDPOINT_CONFIGFS is enabled::
> +
> + # ls /sys/kernel/config/pci_ep/controllers
> + 2900000.pcie-ep 2910000.pcie-ep
> +
> +
> +Endpoint Function Drivers
> +-------------------------
> +
> +To find the list of endpoint function drivers in the system::
> +
> + # ls /sys/bus/pci-epf/drivers
> + pci_epf_ntb pci_epf_ntb
> +
> +If PCI_ENDPOINT_CONFIGFS is enabled::
> +
> + # ls /sys/kernel/config/pci_ep/functions
> + pci_epf_ntb pci_epf_ntb
> +
> +
> +Creating pci-epf-ntb Device
> +----------------------------
> +
> +PCI endpoint function device can be created using the configfs. To create
> +pci-epf-ntb device, the following commands can be used::
> +
> + # mount -t configfs none /sys/kernel/config
> + # cd /sys/kernel/config/pci_ep/
> + # mkdir functions/pci_epf_ntb/func1
> +
> +The "mkdir func1" above creates the pci-epf-ntb function device that will
> +be probed by pci_epf_ntb driver.
> +
> +The PCI endpoint framework populates the directory with the following
> +configurable fields::
> +
> + # ls functions/pci_epf_ntb/func1
> + baseclass_code deviceid msi_interrupts pci-epf-ntb.0
> + progif_code secondary subsys_id vendorid
> + cache_line_size interrupt_pin msix_interrupts primary
> + revid subclass_code subsys_vendor_id
> +
> +The PCI endpoint function driver populates these entries with default values
> +when the device is bound to the driver. The pci-epf-ntb driver populates
> +vendorid with 0xffff and interrupt_pin with 0x0001::
> +
> + # cat functions/pci_epf_ntb/func1/vendorid
> + 0xffff
> + # cat functions/pci_epf_ntb/func1/interrupt_pin
> + 0x0001
> +
> +
> +Configuring pci-epf-ntb Device
> +-------------------------------
> +
> +The user can configure the pci-epf-ntb device using configfs entry. In order
using its configfs entry.
> +to change the vendorid and the deviceid, the following
> +commands can be used::
> +
> + # echo 0x104c > functions/pci_epf_ntb/func1/vendorid
> + # echo 0xb00d > functions/pci_epf_ntb/func1/deviceid
> +
> +In-order to configure NTB specific attributes, a new sub-directory to func1
In order
> +should be created::
> +
> + # mkdir functions/pci_epf_ntb/func1/pci_epf_ntb.0/
> +
> +The NTB function driver will populate this directory with various attributes
> +that can be configured by the user::
> +
> + # ls functions/pci_epf_ntb/func1/pci_epf_ntb.0/
> + db_count mw1 mw2 mw3 mw4 num_mws
> + spad_count
> +
> +A sample configuration for NTB function is given below::
> +
> + # echo 4 > functions/pci_epf_ntb/func1/pci_epf_ntb.0/db_count
> + # echo 128 > functions/pci_epf_ntb/func1/pci_epf_ntb.0/spad_count
> + # echo 2 > functions/pci_epf_ntb/func1/pci_epf_ntb.0/num_mws
> + # echo 0x100000 > functions/pci_epf_ntb/func1/pci_epf_ntb.0/mw1
> + # echo 0x100000 > functions/pci_epf_ntb/func1/pci_epf_ntb.0/mw2
> +
> +Binding pci-epf-ntb Device to EP Controller
> +--------------------------------------------
> +
> +NTB function device should be attached to two PCIe endpoint controllers
> +connected to the two hosts. Use the 'primary' and 'secondary' entries
> +inside NTB function device to attach one PCIe endpoint controller to
> +primary interface and the other PCIe endpoint controller to the secondary
> +interface. ::
> +
> + # ln -s controllers/2900000.pcie-ep/ functions/pci-epf-ntb/func1/primary
> + # ln -s controllers/2910000.pcie-ep/ functions/pci-epf-ntb/func1/secondary
> +
> +Once the above step is completed, both the PCI endpoint controllers is ready to
are ready
> +establish a link with the host.
> +
> +
> +Start the Link
> +--------------
> +
> +In order for the endpoint device to establish a link with the host, the _start_
> +field should be populated with '1'. For NTB, both the PCIe endpoint controllers
> +should establish link with the host::
> +
> + #echo 1 > controllers/2900000.pcie-ep/start
> + #echo 1 > controllers/2910000.pcie-ep/start
> +
> +
> +RootComplex Device
> +==================
> +
> +lspci Output
> +------------
> +
> +Note that the devices listed here correspond to the value populated in 1.4
Can you use a section name (or reference) here instead of "1.4"? I can't see 1.4
when reading with an editor.
> +above::
> +
> + # lspci
> + 0000:00:00.0 PCI bridge: Texas Instruments Device b00d
> + 0000:01:00.0 RAM memory: Texas Instruments Device b00d
> +
> +
> +Using ntb_hw_epf Device
> +-----------------------
> +
> +The host side software follows the standard NTB software architecture in Linux.
> +All the existing client side NTB utilities like NTB Transport Client and NTB
> +Netdev, NTB Ping Pong Test Client and NTB Tool Test Clientcan be used with NTB
Client can be
> +function device.
> +
> +For more information on NTB see
> +Documentation/driver-api/ntb.rst
thanks.
--
~Randy
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