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 at 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 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
