[PATCH] net/sfc: invalidate switch port entry on representor unplug

[Andrew Rybchenko]

On 3/10/23 20:07, Ivan Malov wrote:
> Once allocated, a switch port list entry always stays there,
> even after unplugging the ethdev that created it. Currently,
> the entry's ethdev ID is not cleared on unplug. Referencing
> the ethdev ID of a detached representor from a flow rule is
> going to succeed, which is a bug. Also, if the user unplugs
> endpoint "A" representor and plugs one for "B" instead, the
> latter will pick the same ethdev ID as the gone representor,
> but it will have a new port list entry added for it. If the
> user tries to reference the ethdev ID from a flow rule, the
> code will fetch the wrong entry ("A" rather than "B") since
> it sits closer to the list head. That is a serious bug, too.
> 
> Make the driver invalidate ethdev ID field on ethdev unplug.
> 
> Fixes: 1fb65e4dae8a ("net/sfc: support flow action port ID in transfer rules")
> Fixes: a62ec90522a6 ("net/sfc: add port representors infrastructure")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Ivan Malov <ivan.malov at arknetworks.am>
> Reviewed-by: Andy Moreton <amoreton at xilinx.com>

Acked-by: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>