1 .. SPDX-License-Identifier: BSD-3-Clause
2 Copyright(c) 2019 Marvell International Ltd.
4 Marvell OCTEON TX2 End Point Rawdev Driver
5 ==========================================
7 OCTEON TX2 has an internal SDP unit which provides End Point mode of operation
8 by exposing its IOQs to Host, IOQs are used for packet I/O between Host and
9 OCTEON TX2. Each OCTEON TX2 SDP PF supports a max of 128 VFs and Each VF is
10 associated with a set of IOQ pairs.
15 This OCTEON TX2 End Point mode PMD supports
17 #. Packet Input - Host to OCTEON TX2 with direct data instruction mode.
19 #. Packet Output - OCTEON TX2 to Host with info pointer mode.
24 The following options can be modified in the ``config`` file.
26 - ``CONFIG_RTE_LIBRTE_PMD_OCTEONTX2_EP_RAWDEV`` (default ``y``)
28 Toggle compilation of the ``lrte_pmd_octeontx2_ep`` driver.
33 The number of SDP VFs enabled, can be controlled by setting sysfs
34 entry `sriov_numvfs` for the corresponding PF driver.
36 .. code-block:: console
38 echo <num_vfs> > /sys/bus/pci/drivers/octeontx2-ep/0000\:04\:00.0/sriov_numvfs
40 Once the required VFs are enabled, to be accessible from DPDK, VFs need to be
41 bound to vfio-pci driver.
46 The OCTEON TX2 SDP End Point VF devices will need to be bound to a
47 user-space IO driver for use. The script ``dpdk-devbind.py`` script
48 included with DPDK can be used to view the state of the devices and to bind
49 them to a suitable DPDK-supported kernel driver. When querying the status
50 of the devices, they will appear under the category of "Misc (rawdev)
51 devices", i.e. the command ``dpdk-devbind.py --status-dev misc`` can be
52 used to see the state of those devices alone.
57 Configuring SDP EP rawdev device is done using the ``rte_rawdev_configure()``
58 API, which takes the mempool as parameter. PMD uses this pool to send/receive
59 packets to/from the HW.
61 The following code shows how the device is configured
65 struct sdp_rawdev_info config = {0};
66 struct rte_rawdev_info rdev_info = {.dev_private = &config};
67 config.enqdeq_mpool = (void *)rte_mempool_create(...);
69 rte_rawdev_configure(dev_id, (rte_rawdev_obj_t)&rdev_info,
72 Performing Data Transfer
73 ------------------------
75 To perform data transfer using SDP VF EP rawdev devices use standard
76 ``rte_rawdev_enqueue_buffers()`` and ``rte_rawdev_dequeue_buffers()`` APIs.
81 On EAL initialization, SDP VF devices will be probed and populated into the
82 raw devices. The rawdev ID of the device can be obtained using
84 * Invoke ``rte_rawdev_get_dev_id("SDPEP:x")`` from the test application
85 where x is the VF device's bus id specified in "bus:device.func"(BDF)
86 format. Use this index for further rawdev function calls.
88 * The driver's selftest rawdev API can be used to verify the SDP EP mode
89 functional tests which can send/receive the raw data packets to/from the