[PATCH] net/mlx5: reject flow template API reconfiguration

[Raslan Darawsheh]

Hi,

> -----Original Message-----
> From: Dariusz Sosnowski <dsosnowski at nvidia.com>
> Sent: Saturday, February 25, 2023 9:58 PM
> To: Matan Azrad <matan at nvidia.com>; Slava Ovsiienko
> <viacheslavo at nvidia.com>
> Cc: dev at dpdk.org
> Subject: [PATCH] net/mlx5: reject flow template API reconfiguration
> 
> Flow Template API allows rte_flow_configure() to be called more than once, to
> allow applications to dynamically reconfigure the amount of resources
> available for flow table and flow rule creation.
> PMDs can reject the change in configuration and keep the old configuration.
> 
> Before this patch, during Flow Template API reconfiguration in mlx5 PMD, all
> the allocated resources (HW/FW object pools, flow rules, pattern and actions
> templates) were released and reallocated according to the new configuration.
> This however leads to undefined behavior, since all references to templates,
> flows or indirect actions, which are held by the user, are now invalidated.
> 
> This patch changes the reconfiguration behavior.
> Configuration provided to rte_flow_configure() is stored in port's private data
> structure. On any subsequent call to rte_flow_configure(), the provided
> configuration is compared against the stored configuration.
> If both are equal, rte_flow_configure() reports a success and configuration is
> unaffected. Otherwise, (-ENOTSUP) is returned.
> 
> Signed-off-by: Dariusz Sosnowski <dsosnowski at nvidia.com>

Patch applied to net-net-mlx,

Kindest regards
Raslan Darawsheh