Intel EP80579 Benutzerhandbuch

Intel

®

 EP80579 Software for Security Applications on Intel

®

 QuickAssist Technology

August 2009

PG

Order Number: 320183-004US

61

Interrupt coalescing is the combining of several interrupts into one interrupt. This 

feature is available on Intel

®

 EP80579 Integrated Processor. The user may configure 

the duration of time over which to collect the interrupts. See 

 for descriptions of the relevant variables:

•

•

The Cryptographic API is designed to support multiple security services units, or 

“engines”. The engine is specified using the CpaInstanceHandle handle type. This 

handle will represent a specific engine within the system and will be passed into the 

symmetric and asymmetric API. 

EP80579 with QuickAssist only supports one engine; this is specified through passing in 

the value CPA_INSTANCE_HANDLE_SINGLE to the API for the acceleration handle.

The API tracks the number of outstanding sessions per handle and for public key, the 

number of outstanding requests. 

The API also has support for priorities per request. In the current release, two levels of 

priorities are supported: High priority or Normal priority.

The software uses a weighted round robin-based priority scheme. Each ring has an 

assigned negative 'weight' parameter. Every time a particular ring is polled, its current 

weight is increased. Once the weight becomes zero, the weight is reloaded with its 

assigned initial value and the poll moves to the next non-empty ring. 

High priority rings have a larger negative value, meaning they are checked more 

frequently before jumping to the next ring.

The Cryptographic API supports statistics retrieval and display for the individual 

symmetric and asymmetric components. For further information, refer to the API 

manual. The following functions are supported:

• Retrieve statistics (symmetric and asymmetric components). The statistics are 

retrieved on a per-instance basis - the information stored includes the following:

— number of symmetric sessions initialized, removed and errors
— numbers of requested operations, completed operations, and failed operations 

(symmetric and asymmetric components)

Data flow for the Cryptographic API is shown in 

 (asynchronous 

and synchronous). The assumption here is that the hardware is already initialized and 

ready to process commands.