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Diffstat (limited to 'doc/guides/nics/i40e.rst')
| -rw-r--r-- | doc/guides/nics/i40e.rst | 30 |
1 files changed, 24 insertions, 6 deletions
diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst index bc200d39..cd468748 100644 --- a/doc/guides/nics/i40e.rst +++ b/doc/guides/nics/i40e.rst @@ -78,6 +78,8 @@ Prerequisites - To get better performance on Intel platforms, please follow the "How to get best performance with NICs on Intel platforms" section of the :ref:`Getting Started Guide for Linux <linux_gsg>`. +- Upgrade the NVM/FW version following the `Intel® Ethernet NVM Update Tool Quick Usage Guide for Linux + <https://www-ssl.intel.com/content/www/us/en/embedded/products/networking/nvm-update-tool-quick-linux-usage-guide.html>`_ if needed. Pre-Installation Configuration ------------------------------ @@ -396,13 +398,24 @@ used to classify MPLS packet by using a command in testpmd like: testpmd> ethertype_filter 0 add mac_ignr 00:00:00:00:00:00 ethertype \ 0x8847 fwd queue <M> -16 Byte Descriptor cannot be used on DPDK VF -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +16 Byte RX Descriptor setting on DPDK VF +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -If the Linux i40e kernel driver is used as host driver, while DPDK i40e PMD -is used as the VF driver, DPDK cannot choose 16 byte receive descriptor. That -is to say, user should keep ``CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC=n`` in -config file. +Currently the VF's RX descriptor mode is decided by PF. There's no PF-VF +interface for VF to request the RX descriptor mode, also no interface to notify +VF its own RX descriptor mode. +For all available versions of the i40e driver, these drivers don't support 16 +byte RX descriptor. If the Linux i40e kernel driver is used as host driver, +while DPDK i40e PMD is used as the VF driver, DPDK cannot choose 16 byte receive +descriptor. The reason is that the RX descriptor is already set to 32 byte by +the i40e kernel driver. That is to say, user should keep +``CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC=n`` in config file. +In the future, if the Linux i40e driver supports 16 byte RX descriptor, user +should make sure the DPDK VF uses the same RX descriptor mode, 16 byte or 32 +byte, as the PF driver. + +The same rule for DPDK PF + DPDK VF. The PF and VF should use the same RX +descriptor mode. Or the VF RX will not work. Receive packets with Ethertype 0x88A8 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ @@ -465,6 +478,11 @@ enabled using the steps below. setpci -s <XX:XX.X> a8.w=<value> +Vlan strip of VF +~~~~~~~~~~~~~~~~ + +The VF vlan strip function is only supported in the i40e kernel driver >= 2.1.26. + High Performance of Small Packets on 40G NIC -------------------------------------------- |