Unloading hardware based crypto to fallback to software based crypto

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Hi,

Is there a mechanism to allow a hardware crypto driver to be unloaded and the 
IPsec session to fallback to using software based crypto drivers ?

The requirement is to not take down the IPsec tunnel whilst unloading the 
hardware crypto driver. Bascially, the hardware become unavailable during the 
session.

Conversely, is there a mechanism to dynamically upgrade from using software 
based crypto to hardware based crypto without killing the IPsec tunnel ?

Thanks for any info.

Regards,
Dean Jenkins
MontaVista Software
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