doc: add code example for virtio-user exception path

The HOWTO guide for using virtio-user as an exception path to the kernel
only provided an example of how testpmd may be used for that purpose.
Ho

doc: add code example for virtio-user exception path

The HOWTO guide for using virtio-user as an exception path to the kernel
only provided an example of how testpmd may be used for that purpose.
However, a real application wanting to use virtio-user as exception path
would likely want to create such devices from code within the app
itself. Therefore, we update the doc with instructions and a code
snippet showing how this may be done.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Chenbo Xia <chenbo.xia@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

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doc: rework section on virtio-user as exception path

This patch extensively reworks the howto guide on using virtio-user for
exception packets. Changes include:

* rename "exceptional path" to "exce

doc: rework section on virtio-user as exception path

This patch extensively reworks the howto guide on using virtio-user for
exception packets. Changes include:

* rename "exceptional path" to "exception path"
* remove references to uio and just reference vfio-pci
* simplify testpmd command-lines, giving a basic usage example first
before adding on detail about checksum or TSO parameters
* give a complete working example showing traffic flowing through the
whole system from a testpmd loopback using the created TAP netdev
* replace use of "ifconfig" with Linux standard "ip" command
* other general rewording.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Chenbo Xia <chenbo.xia@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

show more ...