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[ Upstream commit7c9864bbcc] If the accelerated networking SRIOV VF device has lost carrier use the synthetic network device which is available as backup path. This is a rare case since if VF link goes down, normally the VMBus device will also loose external connectivity as well. But if the communication is between two VM's on the same host the VMBus device will still work. Reported-by: "Shah, Ashish N" <ashish.n.shah@intel.com> Fixes:0c195567a8("netvsc: transparent VF management") Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 Restructured Text 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.