1 .. SPDX-License-Identifier: BSD-3-Clause
2 Copyright(c) 2016 Cavium, Inc
4 ThunderX NICVF Poll Mode Driver
5 ===============================
7 The ThunderX NICVF PMD (**librte_net_thunderx**) provides poll mode driver
8 support for the inbuilt NIC found in the **Cavium ThunderX** SoC family
9 as well as their virtual functions (VF) in SR-IOV context.
11 More information can be found at `Cavium, Inc Official Website
12 <http://www.cavium.com/ThunderX_ARM_Processors.html>`_.
17 Features of the ThunderX PMD are:
19 - Multiple queues for TX and RX
20 - Receive Side Scaling (RSS)
21 - Packet type information
25 - Port hardware statistics
27 - Link state information
28 - Setting up link state.
29 - Scattered and gather for TX and RX
33 - Multi queue set support (up to 96 queues (12 queue sets)) per port
36 Supported ThunderX SoCs
37 -----------------------
44 - Follow the DPDK :ref:`Getting Started Guide for Linux <linux_gsg>` to setup the basic DPDK environment.
47 Driver compilation and testing
48 ------------------------------
50 Refer to the document :ref:`compiling and testing a PMD for a NIC <pmd_build_and_test>`
53 Use config/arm/arm64-thunderx-linux-gcc as a meson cross-file when cross-compiling.
58 SR-IOV: Prerequisites and sample Application Notes
59 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
61 Current ThunderX NIC PF/VF kernel modules maps each physical Ethernet port
62 automatically to virtual function (VF) and presented them as PCIe-like SR-IOV device.
63 This section provides instructions to configure SR-IOV with Linux OS.
65 #. Verify PF devices capabilities using ``lspci``:
67 .. code-block:: console
73 .. code-block:: console
75 0002:01:00.0 Ethernet controller: Cavium Networks Device a01e (rev 01)
77 Capabilities: [100 v1] Alternative Routing-ID Interpretation (ARI)
79 Capabilities: [180 v1] Single Root I/O Virtualization (SR-IOV)
81 Kernel driver in use: thunder-nic
86 Unless ``thunder-nic`` driver is in use make sure your kernel config includes ``CONFIG_THUNDER_NIC_PF`` setting.
88 #. Verify VF devices capabilities and drivers using ``lspci``:
90 .. code-block:: console
96 .. code-block:: console
98 0002:01:00.1 Ethernet controller: Cavium Networks Device 0011 (rev 01)
100 Capabilities: [100 v1] Alternative Routing-ID Interpretation (ARI)
102 Kernel driver in use: thunder-nicvf
105 0002:01:00.2 Ethernet controller: Cavium Networks Device 0011 (rev 01)
107 Capabilities: [100 v1] Alternative Routing-ID Interpretation (ARI)
109 Kernel driver in use: thunder-nicvf
114 Unless ``thunder-nicvf`` driver is in use make sure your kernel config includes ``CONFIG_THUNDER_NIC_VF`` setting.
116 #. Pass VF device to VM context (PCIe Passthrough):
118 The VF devices may be passed through to the guest VM using qemu or
119 virt-manager or virsh etc.
121 Example qemu guest launch command:
123 .. code-block:: console
125 sudo qemu-system-aarch64 -name vm1 \
126 -machine virt,gic_version=3,accel=kvm,usb=off \
128 -smp 4,sockets=1,cores=8,threads=1 \
129 -nographic -nodefaults \
130 -kernel <kernel image> \
131 -append "root=/dev/vda console=ttyAMA0 rw hugepagesz=512M hugepages=3" \
132 -device vfio-pci,host=0002:01:00.1 \
133 -drive file=<rootfs.ext3>,if=none,id=disk1,format=raw \
134 -device virtio-blk-device,scsi=off,drive=disk1,id=virtio-disk1,bootindex=1 \
135 -netdev tap,id=net0,ifname=tap0,script=/etc/qemu-ifup_thunder \
136 -device virtio-net-device,netdev=net0 \
138 -mem-path /dev/hugepages
140 #. Enable **VFIO-NOIOMMU** mode (optional):
142 .. code-block:: console
144 echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode
148 **VFIO-NOIOMMU** is required only when running in VM context and should not be enabled otherwise.
152 Follow instructions available in the document
153 :ref:`compiling and testing a PMD for a NIC <pmd_build_and_test>`
158 .. code-block:: console
160 ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 -a 0002:01:00.2 \
161 -- -i --no-flush-rx \
166 PMD: rte_nicvf_pmd_init(): librte_net_thunderx nicvf version 1.0
169 EAL: probe driver: 177d:11 rte_nicvf_pmd
170 EAL: using IOMMU type 1 (Type 1)
171 EAL: PCI memory mapped at 0x3ffade50000
172 EAL: Trying to map BAR 4 that contains the MSI-X table.
173 Trying offsets: 0x40000000000:0x0000, 0x10000:0x1f0000
174 EAL: PCI memory mapped at 0x3ffadc60000
175 PMD: nicvf_eth_dev_init(): nicvf: device (177d:11) 2:1:0:2
176 PMD: nicvf_eth_dev_init(): node=0 vf=1 mode=tns-bypass sqs=false
177 loopback_supported=true
178 PMD: nicvf_eth_dev_init(): Port 0 (177d:11) mac=a6:c6:d9:17:78:01
179 Interactive-mode selected
180 Configuring Port 0 (socket 0)
183 PMD: nicvf_dev_configure(): Configured ethdev port0 hwcap=0x0
184 Port 0: A6:C6:D9:17:78:01
185 Checking link statuses...
186 Port 0 Link Up - speed 10000 Mbps - full-duplex
190 Multiple Queue Set per DPDK port configuration
191 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
193 There are two types of VFs:
198 Each port consists of a primary VF and n secondary VF(s). Each VF provides 8 Tx/Rx queues to a port.
199 When a given port is configured to use more than 8 queues, it requires one (or more) secondary VF.
200 Each secondary VF adds 8 additional queues to the queue set.
202 During PMD driver initialization, the primary VF's are enumerated by checking the
203 specific flag (see sqs message in DPDK boot log - sqs indicates secondary queue set).
204 They are at the beginning of VF list (the remain ones are secondary VF's).
206 The primary VFs are used as master queue sets. Secondary VFs provide
207 additional queue sets for primary ones. If a port is configured for more then
208 8 queues than it will request for additional queues from secondary VFs.
210 Secondary VFs cannot be shared between primary VFs.
212 Primary VFs are present on the beginning of the 'Network devices using kernel
213 driver' list, secondary VFs are on the remaining on the remaining part of the list.
217 The VNIC driver in the multiqueue setup works differently than other drivers like `ixgbe`.
218 We need to bind separately each specific queue set device with the ``usertools/dpdk-devbind.py`` utility.
222 Depending on the hardware used, the kernel driver sets a threshold ``vf_id``. VFs that try to attached with an id below or equal to
223 this boundary are considered primary VFs. VFs that try to attach with an id above this boundary are considered secondary VFs.
228 Loopback HW Unit (LBK) receives packets from NIC-RX and sends packets back to NIC-TX.
229 The loopback block has N channels and contains data buffering that is shared across
230 all channels. Four primary VFs are reserved as loopback ports.
232 Example device binding
233 ~~~~~~~~~~~~~~~~~~~~~~
235 If a system has three interfaces, a total of 18 VF devices will be created
236 on a non-NUMA machine.
240 NUMA systems have 12 VFs per port and non-NUMA 6 VFs per port.
242 .. code-block:: console
244 # usertools/dpdk-devbind.py --status
246 Network devices using DPDK-compatible driver
247 ============================================
250 Network devices using kernel driver
251 ===================================
252 0000:01:10.0 'THUNDERX BGX (Common Ethernet Interface) a026' if= drv=thunder-BGX unused=vfio-pci
253 0000:01:10.1 'THUNDERX BGX (Common Ethernet Interface) a026' if= drv=thunder-BGX unused=vfio-pci
254 0001:01:00.0 'THUNDERX Network Interface Controller a01e' if= drv=thunder-nic unused=vfio-pci
255 0001:01:00.1 'Device a034' if=eth0 drv=thunder-nicvf unused=vfio-pci
256 0001:01:00.2 'Device a034' if=eth1 drv=thunder-nicvf unused=vfio-pci
257 0001:01:00.3 'Device a034' if=eth2 drv=thunder-nicvf unused=vfio-pci
258 0001:01:00.4 'Device a034' if=eth3 drv=thunder-nicvf unused=vfio-pci
259 0001:01:00.5 'Device a034' if=eth4 drv=thunder-nicvf unused=vfio-pci
260 0001:01:00.6 'Device a034' if=lbk0 drv=thunder-nicvf unused=vfio-pci
261 0001:01:00.7 'Device a034' if=lbk1 drv=thunder-nicvf unused=vfio-pci
262 0001:01:01.0 'Device a034' if=lbk2 drv=thunder-nicvf unused=vfio-pci
263 0001:01:01.1 'Device a034' if=lbk3 drv=thunder-nicvf unused=vfio-pci
264 0001:01:01.2 'Device a034' if= drv=thunder-nicvf unused=vfio-pci
265 0001:01:01.3 'Device a034' if= drv=thunder-nicvf unused=vfio-pci
266 0001:01:01.4 'Device a034' if= drv=thunder-nicvf unused=vfio-pci
267 0001:01:01.5 'Device a034' if= drv=thunder-nicvf unused=vfio-pci
268 0001:01:01.6 'Device a034' if= drv=thunder-nicvf unused=vfio-pci
269 0001:01:01.7 'Device a034' if= drv=thunder-nicvf unused=vfio-pci
270 0001:01:02.0 'Device a034' if= drv=thunder-nicvf unused=vfio-pci
271 0001:01:02.1 'Device a034' if= drv=thunder-nicvf unused=vfio-pci
272 0001:01:02.2 'Device a034' if= drv=thunder-nicvf unused=vfio-pci
274 Other network devices
275 =====================
276 0002:00:03.0 'Device a01f' unused=vfio-pci,uio_pci_generic
280 Here total no of primary VFs = 5 (variable, depends on no of ethernet ports present) + 4 (fixed, loopback ports).
281 Ethernet ports are indicated as `if=eth0` while loopback ports as `if=lbk0`.
283 We want to bind two physical interfaces with 24 queues each device, we attach two primary VFs
284 and four secondary VFs. In our example we choose two 10G interfaces eth1 (0002:01:00.2) and eth2 (0002:01:00.3).
285 We will choose four secondary queue sets from the ending of the list (0001:01:01.2-0002:01:02.2).
288 #. Bind two primary VFs to the ``vfio-pci`` driver:
290 .. code-block:: console
292 usertools/dpdk-devbind.py -b vfio-pci 0002:01:00.2
293 usertools/dpdk-devbind.py -b vfio-pci 0002:01:00.3
295 #. Bind four primary VFs to the ``vfio-pci`` driver:
297 .. code-block:: console
299 usertools/dpdk-devbind.py -b vfio-pci 0002:01:01.7
300 usertools/dpdk-devbind.py -b vfio-pci 0002:01:02.0
301 usertools/dpdk-devbind.py -b vfio-pci 0002:01:02.1
302 usertools/dpdk-devbind.py -b vfio-pci 0002:01:02.2
304 The nicvf thunderx driver will make use of attached secondary VFs automatically during the interface configuration stage.
309 Use sysfs to distinguish thunder-nic primary VFs and secondary VFs.
310 .. code-block:: console
312 ls -l /sys/bus/pci/drivers/thunder-nic/
314 drwxr-xr-x 2 root root 0 Jan 22 11:19 ./
315 drwxr-xr-x 86 root root 0 Jan 22 11:07 ../
316 lrwxrwxrwx 1 root root 0 Jan 22 11:19 0001:01:00.0 -> '../../../../devices/platform/soc@0/849000000000.pci/pci0001:00/0001:00:10.0/0001:01:00.0'/
318 .. code-block:: console
320 cat /sys/bus/pci/drivers/thunder-nic/0001\:01\:00.0/sriov_sqs_assignment
322 0 0001:01:00.1 vfio-pci +: 12 13
323 1 0001:01:00.2 thunder-nicvf -:
324 2 0001:01:00.3 thunder-nicvf -:
325 3 0001:01:00.4 thunder-nicvf -:
326 4 0001:01:00.5 thunder-nicvf -:
327 5 0001:01:00.6 thunder-nicvf -:
328 6 0001:01:00.7 thunder-nicvf -:
329 7 0001:01:01.0 thunder-nicvf -:
330 8 0001:01:01.1 thunder-nicvf -:
331 9 0001:01:01.2 thunder-nicvf -:
332 10 0001:01:01.3 thunder-nicvf -:
333 11 0001:01:01.4 thunder-nicvf -:
334 12 0001:01:01.5 vfio-pci: 0
335 13 0001:01:01.6 vfio-pci: 0
336 14 0001:01:01.7 thunder-nicvf: 255
337 15 0001:01:02.0 thunder-nicvf: 255
338 16 0001:01:02.1 thunder-nicvf: 255
339 17 0001:01:02.2 thunder-nicvf: 255
340 18 0001:01:02.3 thunder-nicvf: 255
341 19 0001:01:02.4 thunder-nicvf: 255
342 20 0001:01:02.5 thunder-nicvf: 255
343 21 0001:01:02.6 thunder-nicvf: 255
344 22 0001:01:02.7 thunder-nicvf: 255
345 23 0001:01:03.0 thunder-nicvf: 255
346 24 0001:01:03.1 thunder-nicvf: 255
347 25 0001:01:03.2 thunder-nicvf: 255
348 26 0001:01:03.3 thunder-nicvf: 255
349 27 0001:01:03.4 thunder-nicvf: 255
350 28 0001:01:03.5 thunder-nicvf: 255
351 29 0001:01:03.6 thunder-nicvf: 255
352 30 0001:01:03.7 thunder-nicvf: 255
353 31 0001:01:04.0 thunder-nicvf: 255
355 Every column that ends with 'thunder-nicvf: number' can be used as secondary VF.
356 In printout above all entres after '14 0001:01:01.7 thunder-nicvf: 255' can be used as secondary VF.
361 EAL command option to change log level
362 .. code-block:: console
364 --log-level=pmd.net.thunderx.driver:info
366 --log-level=pmd.net.thunderx.driver,7
373 This feature is used to create a hole between HEADROOM and actual data. Size of hole is specified
374 in bytes as module param("skip_data_bytes") to pmd.
375 This scheme is useful when application would like to insert vlan header without disturbing HEADROOM.
378 .. code-block:: console
380 -a 0002:01:00.2,skip_data_bytes=8
388 The ThunderX SoC family NICs strip the CRC for every packets coming into the
389 host interface irrespective of the offload configuration.
391 Maximum packet length
392 ~~~~~~~~~~~~~~~~~~~~~
394 The ThunderX SoC family NICs support a maximum of a 9K jumbo frame. The value
395 is fixed and cannot be changed. So, even when the ``rxmode.max_rx_pkt_len``
396 member of ``struct rte_eth_conf`` is set to a value lower than 9200, frames
397 up to 9200 bytes can still reach the host interface.
399 Maximum packet segments
400 ~~~~~~~~~~~~~~~~~~~~~~~
402 The ThunderX SoC family NICs support up to 12 segments per packet when working
403 in scatter/gather mode. So, setting MTU will result with ``EINVAL`` when the
404 frame size does not fit in the maximum number of segments.
409 Maximum limit of skip_data_bytes is 128 bytes and number of bytes should be multiple of 8.