1.. SPDX-License-Identifier: BSD-3-Clause 2 Copyright(C) 2021 Marvell. 3 4OCTEON TX EP Poll Mode driver 5============================= 6 7The OCTEON TX EP ETHDEV PMD (**librte_pmd_octeon_ep**) provides poll mode 8ethdev driver support for the virtual functions (VF) of **Marvell OCTEON 9** 9and **Cavium OCTEON** families of adapters in SR-IOV context. 10 11More information can be found at `Marvell Official Website 12<https://www.marvell.com/content/dam/marvell/en/public-collateral/embedded-processors/marvell-liquidio-III-solutions-brief.pdf>`_. 13 14Runtime Config Options 15---------------------- 16 17- ``Rx & Tx ISM memory accesses enable`` (default ``0``) 18 19 The PMD supports two modes for checking Rx & Tx packet count, 20 PMD may read the packet count directly from hardware registers 21 or it may read from ISM memory, 22 this may be selected at runtime using ``ism_enable`` devargs parameter. 23 Performance is higher for bigger size packets with default value (``ism_enable=0``). 24 Use this runtime option to enable ISM memory accesses 25 to get better performance for lower size packets. 26 27 For example:: 28 29 -a 0002:02:00.0,ism_enable=1 30 31Prerequisites 32------------- 33 34This driver relies on external kernel PF driver for resources allocations 35and initialization. The following dependencies are not part of DPDK and 36must be installed separately: 37 38- **Kernel module** 39 This module, octeon_drv, drives the physical function, initializes hardware, 40 allocates resources such as number of VFs, input/output queues for itself and 41 the number of i/o queues each VF can use. 42 43See :doc:`../platform/cnxk` for SDP interface information which provides PCIe endpoint support for a remote host. 44