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.
25 The number of SDP VFs enabled, can be controlled by setting sysfs
26 entry `sriov_numvfs` for the corresponding PF driver.
28 .. code-block:: console
30 echo <num_vfs> > /sys/bus/pci/drivers/octeontx2-ep/0000\:04\:00.0/sriov_numvfs
32 Once the required VFs are enabled, to be accessible from DPDK, VFs need to be
33 bound to vfio-pci driver.
38 The OCTEON TX2 SDP End Point VF devices will need to be bound to a
39 user-space IO driver for use. The script ``dpdk-devbind.py`` script
40 included with DPDK can be used to view the state of the devices and to bind
41 them to a suitable DPDK-supported kernel driver. When querying the status
42 of the devices, they will appear under the category of "Misc (rawdev)
43 devices", i.e. the command ``dpdk-devbind.py --status-dev misc`` can be
44 used to see the state of those devices alone.
49 Configuring SDP EP rawdev device is done using the ``rte_rawdev_configure()``
50 API, which takes the mempool as parameter. PMD uses this pool to send/receive
51 packets to/from the HW.
53 The following code shows how the device is configured
57 struct sdp_rawdev_info config = {0};
58 struct rte_rawdev_info rdev_info = {.dev_private = &config};
59 config.enqdeq_mpool = (void *)rte_mempool_create(...);
61 rte_rawdev_configure(dev_id, (rte_rawdev_obj_t)&rdev_info,
64 Performing Data Transfer
65 ------------------------
67 To perform data transfer using SDP VF EP rawdev devices use standard
68 ``rte_rawdev_enqueue_buffers()`` and ``rte_rawdev_dequeue_buffers()`` APIs.
73 On EAL initialization, SDP VF devices will be probed and populated into the
74 raw devices. The rawdev ID of the device can be obtained using
76 * Invoke ``rte_rawdev_get_dev_id("SDPEP:x")`` from the test application
77 where x is the VF device's bus id specified in "bus:device.func"(BDF)
78 format. Use this index for further rawdev function calls.
80 * The driver's selftest rawdev API can be used to verify the SDP EP mode
81 functional tests which can send/receive the raw data packets to/from the