net/mlx5e: Prevent concurrent access to IPSec ASO context

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5e: Prevent concurrent access to IPSec ASO context

The query or updating IPSec offload object is through Access ASO WQE.

The driver uses a single mlx5e_ipsec_aso struct for each PF, which

contains a shared DMA-mapped context for all ASO operations.

A race condition exists because the ASO spinlock is released before

the hardware has finished processing WQE. If a second operation is

initiated immediately after, it overwrites the shared context in the

DMA area.

When the first operation's completion is processed later, it reads

this corrupted context, leading to unexpected behavior and incorrect

results.

This commit fixes the race by introducing a private context within

each IPSec offload object. The shared ASO context is now copied to

this private context while the ASO spinlock is held. Subsequent

processing uses this saved, per-object context, ensuring its integrity

is maintained.