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[204.195.35.107]) by smtp.gmail.com with ESMTPSA id t80-v6sm20535983pfg.0.2018.05.14.21.32.09 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 14 May 2018 21:32:09 -0700 (PDT) From: Stephen Hemminger To: dev@dpdk.org Cc: Stephen Hemminger Date: Mon, 14 May 2018 21:31:53 -0700 Message-Id: <20180515043154.19239-5-stephen@networkplumber.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180515043154.19239-1-stephen@networkplumber.org> References: <20180515043154.19239-1-stephen@networkplumber.org> Subject: [dpdk-dev] [PATCH v7 4/5] net/netvsc: add documentation X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" From: Stephen Hemminger Matching documentation for new netvsc device. Signed-off-by: Stephen Hemminger --- doc/guides/nics/features/netvsc.ini | 23 ++++++ doc/guides/nics/index.rst | 1 + doc/guides/nics/netvsc.rst | 103 +++++++++++++++++++++++++ doc/guides/rel_notes/release_18_05.rst | 5 ++ 4 files changed, 132 insertions(+) create mode 100644 doc/guides/nics/features/netvsc.ini create mode 100644 doc/guides/nics/netvsc.rst diff --git a/doc/guides/nics/features/netvsc.ini b/doc/guides/nics/features/netvsc.ini new file mode 100644 index 000000000000..2ff6042bf47b --- /dev/null +++ b/doc/guides/nics/features/netvsc.ini @@ -0,0 +1,23 @@ +; +; Supported features of the 'netvsc' network poll mode driver. +; +; Refer to default.ini for the full list of available PMD features. +; +[Features] +Speed capabilities = P +Link status = Y +Queue start/stop = Y +Scattered Rx = Y +Promiscuous mode = Y +Allmulticast mode = Y +Basic stats = Y +Stats per queue = Y +Extended stats = Y +Multiprocess aware = Y +Other kdrv = Y +ARMv7 = Y +ARMv8 = Y +x86-32 = Y +x86-64 = Y +Usage doc = Y +MTU update = Y diff --git a/doc/guides/nics/index.rst b/doc/guides/nics/index.rst index ddb9eb7a922e..d4eae2b8f046 100644 --- a/doc/guides/nics/index.rst +++ b/doc/guides/nics/index.rst @@ -33,6 +33,7 @@ Network Interface Controller Drivers mlx4 mlx5 mvpp2 + netvsc nfp octeontx qede diff --git a/doc/guides/nics/netvsc.rst b/doc/guides/nics/netvsc.rst new file mode 100644 index 000000000000..e81dc002f403 --- /dev/null +++ b/doc/guides/nics/netvsc.rst @@ -0,0 +1,103 @@ +.. SPDX-License-Identifier: BSD-3-Clause + Copyright(c) Microsoft Corporation. + +Netvsc poll mode driver +======================= + +The Netvsc Poll Mode driver (PMD) provides support for the paravirtualized +network device for Microsoft Hyper-V. It can be used with +Window Server 2008/2012/2016, Windows 10 and Azure cloud. +The device offers multi-queue support (if kernel and host support it), +checksum and segmentation offloads. + + +Features and Limitations of Hyper-V PMD +--------------------------------------- + +In this release, the hyper PMD driver provides the basic functionality of packet reception and transmission. + +* It supports merge-able buffers per packet when receiving packets and scattered buffer per packet + when transmitting packets. The packet size supported is from 64 to 65536. + +* The PMD supports multicast packets and promiscuous mode subject to restrictions on the host. + In order to this to work, the guest network configuration on Hyper-V must be configured to allow MAC address + spoofing. This option is not available on Azure. + +* The device has only a single MAC address. + Hyper-V driver does not support MAC or VLAN filtering because the Hyper-V host does not support it. + +* VLAN tags are always stripped and presented in mbuf tci field. + +* The Hyper-V driver does not use or support Link State or Rx interrupt. + +* The maximum number of queues is limited by the host (currently 64). + When used with 4.16 kernel only a single queue is available. + +* This driver is intended for use with synthetic path only. + Accelerated Networking (SR-IOV) acceleration is not supported yet. + Use the VDEV_NETVSC device for accelerated networking instead. + + +Installation +------------ + +The Netvsc PMD is a standalone driver, similar to virtio and vmxnet3. +Using Netvsc PMD requires that the associated VMBUS device be bound to the userspace +I/O device driver for Hyper-V (uio_hv_generic). By default, all netvsc devices +will be bound to the Linux kernel driver; in order to use netvsc PMD the +device must first be overridden. + +The first step is to identify the network device to override. +VMBUS uses Universal Unique Identifiers +(`UUID`_) to identify devices on the bus similar to how PCI uses Domain:Bus:Function. +The UUID associated with a Linux kernel network device can be determined +by looking at the sysfs information. To find the UUID for eth1 and +store it in a shell variable: + + .. code-block:: console + + DEV_UUID=$(basename $(readlink /sys/class/net/eth1/device)) + + +.. _`UUID`: https://en.wikipedia.org/wiki/Universally_unique_identifier + +There are several possible ways to assign the uio device driver for a device. +The easiest way (but only on 4.18 or later) +is to use the `driverctl Device Driver control utility`_ to override +the normal kernel device. + + .. code-block:: console + + driverctl -b vmbus set-override $DEV_UUID uio_hv_generic + +.. _`driverctl Device Driver control utility`: https://gitlab.com/driverctl/driverctl + +Any settings done with driverctl are by default persistent and will be reapplied +on reboot. + +On older kernels, the same effect can be had by manual sysfs bind and unbind +operations: + + .. code-block:: console + + NET_UUID="f8615163-df3e-46c5-913f-f2d2f965ed0e" + modprobe uio_hv_generic + echo $NET_UUID > /sys/bus/vmbus/drivers/uio_hv_generic/new_id + echo $DEV_UUID > /sys/bus/vmbus/drivers/hv_netvsc/unbind + echo $DEV_UUID > /sys/bus/vmbus/drivers/uio_hv_generic/bind + +.. Note:: + + The dpkd-devbind.py script should not be used. It only handles PCI devices. + + +Prerequisites +------------- + +The following prerequisites apply: + +* Linux kernel support for UIO on vmbus is done with the uio_hv_generic driver. + This driver was originally added in 4.14 kernel, but that version lacks necessary + features for networking. The 4.16 kernel will work but is limited to a single queue. + Supporting multiple queues (subchannels) required additional changes + which will be added in 4.18. diff --git a/doc/guides/rel_notes/release_18_05.rst b/doc/guides/rel_notes/release_18_05.rst index 74ca3cf280d8..30c41ca8f4f4 100644 --- a/doc/guides/rel_notes/release_18_05.rst +++ b/doc/guides/rel_notes/release_18_05.rst @@ -230,6 +230,11 @@ New Features on eth devices (right now only via SW RX/TX callbacks). It also adds dependency on libelf. +* **Added experimental support for Hyper-V netvsc PMD.** + + The new experimental ``netvsc`` poll mode driver provides native support for + networking on Hyper-V. See the :doc:`../nics/netvsc` NIC driver guide + for more details on this new driver. API Changes -----------