[dpdk-dev] [PATCH v4 04/12] net/failsafe: add fail-safe PMD

[Gaëtan Rivet]

On Thu, Jun 01, 2017 at 10:57:22AM -0700, Stephen Hemminger wrote:
> On Thu, 1 Jun 2017 16:01:37 +0200
> Gaëtan Rivet <gaetan.rivet at 6wind.com> wrote:
> 
> > What is necessary is a common piece of info (it can be MAC address, a
> > class Id, anything else) that allows a script to detect that the right
> > device has been plugged in. As long as the NFV server allows determinism
> > here, the user will be able to use its VF.
> 
> There is a serial number property (GUID) on vmbus that is what Windows uses
> to associate VF and SF device. It maybe visible over sysfs.
> 
> But it make senses to put that kind of system dependent matching rule in
> some other place (DPDK bus logic? or external daemon).

I think it might make sense to have expanded matching feature in
rte_buses. For example, being able to match devices using metadatas specific
to a bus, while allowing wildcards-like behavior.

Such as expressing "Probe all devices having a vendor:device id pair
in such ranges", and having an "INTR_ADD" event added to mirror the
"INTR_RMV" already existing.

Other possible grammar elements for device matching could be thought up,
not limited to NFV servers. Once the buses have somewhat stabilized in
this release or the next.

But the exec stanza allows the fail-safe to have answers for this configuration
and possibly many others, at least while the buses are not capable
enough.

-- 
Gaëtan Rivet
6WIND