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Multiple sources can request VF link state changes with identical parameters. For example, OpenStack Neutron may request to set the VF link state to IFLA_VF_LINK_STATE_AUTO during every initialization or user can issue: `ip link set <ifname> vf 0 state auto` multiple times. Currently, the i40e driver processes each of these requests, even if the requested state is the same as the current one. This leads to unnecessary VF resets and can cause performance degradation or instability in the VF driver, particularly in environment using Data Plane Development Kit (DPDK). With this patch i40e will skip VF link state change requests when the desired link state matches the current configuration. This prevents unnecessary VF resets and reduces PF-VF communication overhead. To reproduce the problem run following command multiple times on the same interface: 'ip link set <ifname> vf 0 state auto' Every time command is executed, PF driver will trigger VF reset. Co-developed-by: Robert Malz <robert.malz@canonical.com> Signed-off-by: Robert Malz <robert.malz@canonical.com> Signed-off-by: Jay Vosburgh <jay.vosburgh@canonical.com> Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com> Tested-by: Rafal Romanowski <rafal.romanowski@intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.