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Diffstat (limited to 'doc/guides/nics/i40e.rst')
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diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst index cd468748..71d95611 100644 --- a/doc/guides/nics/i40e.rst +++ b/doc/guides/nics/i40e.rst @@ -134,6 +134,17 @@ Driver compilation and testing Refer to the document :ref:`compiling and testing a PMD for a NIC <pmd_build_and_test>` for details. +- ``Support multiple driver`` (default ``disable``) + + There was a multiple driver support issue during use of 700 series Ethernet + Adapter with both Linux kernel and DPDK PMD. To fix this issue, ``devargs`` + parameter ``support-multi-driver`` is introduced, for example:: + + -w 84:00.0,support-multi-driver=1 + + With the above configuration, DPDK PMD will not change global registers, and + will switch PF interrupt from IntN to Int0 to avoid interrupt conflict between + DPDK and Linux Kernel. SR-IOV: Prerequisites and sample Application Notes -------------------------------------------------- @@ -483,6 +494,18 @@ Vlan strip of VF The VF vlan strip function is only supported in the i40e kernel driver >= 2.1.26. +Global configuration warning +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +I40E PMD will set some global registers to enable some function or set some +configure. Then when using different ports of the same NIC with Linux kernel +and DPDK, the port with Linux kernel will be impacted by the port with DPDK. +For example, register I40E_GL_SWT_L2TAGCTRL is used to control L2 tag, i40e +PMD uses I40E_GL_SWT_L2TAGCTRL to set vlan TPID. If setting TPID in port A +with DPDK, then the configuration will also impact port B in the NIC with +kernel driver, which don't want to use the TPID. +So PMD reports warning to clarify what is changed by writing global register. + High Performance of Small Packets on 40G NIC -------------------------------------------- |