Re: [dpdk-dev] [PATCH] doc: add limitations for i40e PMD

["Xing, Beilei" <beilei.xing@intel.com>]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Jingjing Wu
> Sent: Tuesday, September 6, 2016 10:17 AM
> To: Mcnamara, John <john.mcnamara@intel.com>
> Cc: dev@dpdk.org; Wu, Jingjing <jingjing.wu@intel.com>; Zhang, Helin
> <helin.zhang@intel.com>
> Subject: [dpdk-dev] [PATCH] doc: add limitations for i40e PMD
> 
> This patch adds "Limitations or Known issues" section for i40e PMD, including
> two items:
> 1. MPLS packet classification on X710/XL710 2. 16 Byte Descriptor cannot be
> used on DPDK VF
> 
> Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
> ---
>  doc/guides/nics/i40e.rst | 33 +++++++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
> 
> diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst index
> 4d12b10..6df0f7a 100644
> --- a/doc/guides/nics/i40e.rst
> +++ b/doc/guides/nics/i40e.rst
> @@ -411,3 +411,36 @@ configuration passed on the EAL command line.
> 
>  The floating VEB functionality requires a NIC firmware version of 5.0  or
> greater.
> +
> +
> +Limitations or Known issues
> +---------------------------
> +
> +MPLS packet classification on X710/XL710
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +Before NIC firmware version of 5.0, MPLS packet cannot be recognized by
> NIC.
> +The L2 Payload flow type in flow director can be used to classify MPLS
> +packet by the command in testpmd like:
> +
> +   testpmd> flow_director_filter 0 mode IP add flow l2_payload ether \
> +            0x8847 flexbytes () fwd pf queue <N> fd_id <M>
> +
> +In the NIC firmware whose version is 5.0 or greater, very limited MPLS
> +support is added: Native MPLS skip is implemented, that is, packet type
> +can be recognized like MPLS header is skipped, while no new packet type
> +and no more meta data is extracted from MPLS header. With this change,
> +L2 Payload flow type in flow director cannot be used to classify MPLS packet
> as previous.
> +Meanwhile, Ethertype filter can be used to classify MPLS packet by the
> +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
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +If Linux i40e kerel driver is used as host driver, while DPDK i40e PMD

one typo:  kerel -> kernel

> +is used as VF driver, DPDK cannot choose 16 byte descriptor receive
> +descriptor. That is to say, user should keep
> +"CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC=n" in config file.
> --
> 2.4.11