- Revision History
- Overview
- Features
- Setup
- Supported Devices
- Limitations
- Environmental Assumptions
- Examples
- Open Issues
- Resolved Issues
- Licensing
- Legal
- Terminology
| Date | Doc Revision | Version | Details |
|---|---|---|---|
| August 2021 | 004 | 21.08 | - Added support for deflate compression - Compress and Verify (CnV) and Compress and Verify and Recover (CnVnR) - Added Physical Function to Virtual Function (PFVF) communication support |
| May 2021 | 003 | 21.05 | - Added support for AES-CCM 192/265 - Added support for SHA3-224/384/512 (no partials support) - Added support for ChaCha20-Poly1305 - Added support for PKE 8K (RSA, DH, ModExp, ModInv) - Fixed device enumeration on different nodes - Fixed pci_vfio_set_command for 32 bit builds |
| November 2020 | 002 | 20.10 | - Fixed service stopping during uninstallation - Fixed "Cannot open /sys/kernel/iommu_groups/vfio/devices/" error - Fixes based on static code analysis - Fixes based on secure code reviews - Refactored logging mechanism - Updated library versioning scheme - Improvements to make install target - Fix so service file installed in /usr/lib64 can be properly detected - Remove execute permissions from non-executable files - Clarified documentation of licensing - Removed libudev dependency from the package - Removed OpenSSL/libcrypto extracts, instead link against system OpenSSL/libcrypto |
| August 2020 | 001 | 20.08 | - Initial Release |
Intel(R) QuickAssist Technology (Intel(R) QAT) provides hardware acceleration for offloading security, authentication and compression services from the CPU, thus significantly increasing the performance and efficiency of standard platform solutions.
Its services include symmetric encryption and authentication, asymmetric encryption, digital signatures, RSA, DH and ECC, and lossless data compression.
This package provides user space libraries that allow access to Intel(R) QuickAssist devices and expose the Intel(R) QuickAssist APIs and sample codes.
The following services are available in qatlib via the QuickAssist API:
- Symmetric (Bulk) Cryptography
- Ciphers (AES-ECB, AES-CBC, AES-CTR (no partials support), AES-XTS (no partials support), AES-GCM, AES-CCM (192/256)
- Message digest/hash (SHA1, SHA2 (224/256/384/512), SHA3 (224/256/384/512) (no partials support) and authentication (AES-CBC-MAC, AES-XCBC-MAC)
- Algorithm chaining (one cipher and one hash in a single operation)
- Authenticated encryption (CCM-128 (no partials support), GCM (128/192/256) (no partials support), GMAC (no partials support) and ChaCha20-Poly1305)
- KeyGen
- TLS1.2
- TLS1.3
- HKDF
- MGF1
- Asymmetric (Public Key) Cryptography
- Modular exponentiation and modular inversion up to 8192 bits
- Diffie-Hellman (DH) key generation phase 1 and 2 up to 8192 bits
- RSA key generation, encryption/decryption and digital signature generation/verification up to 8192 bits
- DSA parameter generation and digital signature generation/verification
- Elliptic Curve Cryptography: ECDSA, ECDHE, Edwards Montgomery curves
- Compression
- Deflate
- Compress and Verify (CnV)
- Compress and Verify and Recover (CnVnR)
This package includes:
- libqat: user space library for QAT devices exposed via the vfio kernel driver
- libusdm: user space library for memory management
- qatmgr: user space daemon for device management
- Sample codes: applications to demo usage of the libs
Please refer to INSTALL for details on installing the library.
- 4xxx (QAT gen 4 devices)
Earlier generations of QAT devices (e.g. c62x, dh895xxcc, etc.) are not supported.
- If an error occurs on the host driver (Heartbeat, Uncorrectable error) it will not be communicated to the library.
The following features are not currently supported:
- Dynamic instances
- Intel® Key Protection Technology (KPT)
- Event driven polling
- Maximum 16 processes per end point
The following assumptions are made concerning the deployment environment:
- Users within the same processing domain must be trusted.
- The Intel® QAT device should not be exposed (via the "user space direct" deployment model) to untrusted users.
- DRAM is considered to be inside the trust boundary. The typical memory protection schemes provided by the Intel architecture processor and memory controller, and by the operating system, prevent unauthorized access to these memory regions.
- A QuickAssist kernel driver for the supported device is installed, which has discovered and initialised the device, exposing the VFs. This driver is included in the Linux kernel from v5.11 though v5.16 and is necessary for compression services.
- The library can be used by unprivileged users if that user is included in the 'qat' group.
Example applications that showcase usage of the QAT APIs are included in the package (quickassist/lookaside/access_layer/src/sample_code). Please refer to Intel® QuickAssist Technology API Programmer's Guide.
Known issues relating to the Intel® QAT software are described in this section.
Issue titles follow the pattern:
<Component> [Stepping] - Description of issue
where: <Component> is one of the following:
- CY - Cryptographic
- DC - Compression
- EP - Endpoint
- GEN - General
- SYM DP - Symmetric Cryptography on Data Plane
- SR-IOV - Single Root I/O Virtualization
- FW - Firmware
- PERF - Performance
[Stepping] is an optional qualifier that identifies if the errata applies to a specific device stepping
| Title | CY - cpaCySymPerformOp when used with parameter checking may reveal the amount of padding. |
|---|---|
| Reference # | QATE-3241 |
| Description | When Performing a CBC Decryption as a chained request using cpaCySymPerformOp it is necessary to pass a length of the data to MAC (messageLenToHashInBytes). With ICP_PARAM_CHECK enabled, this checks the length of data to MAC is valid and, if not, it aborts the whole operation and outputs an error on stderr. |
| Implication | The length of the data to MAC is based on the amount of padding. This should remain private and not be revealed. The issue is not observed when the length is checked in constant time before passing the value to the API. This is done by OpenSSL. |
| Resolution | 1. Build without ICP_PARAM_CHECK, but this opens the risk of buffer overrun. 2. Validate the length before using the API. |
| Affected OS | Linux |
| Driver/Module | CPM-IA - Crypto |
| Title | CY - Incorrect digest returned when performing a plain hash operation on input data of size 4GB or larger. |
|---|---|
| Reference # | QATE-41707 |
| Description | When performing a plain hash operation on input data size of 4GB or larger, incorrect digest is returned. |
| Implication | Incorrect digest is returned from a plane hash operation. |
| Resolution | There is no fix available. |
| Affected OS | Linux |
| Driver/Module | CPM-IA - Crypto |
| Title | DC - cpaDcDeflateCompressBound API returns incorrect output buffer size when input size exceeds 477218588 bytes. |
|---|---|
| Reference # | QATE-74786 |
| Description | When cpaDcDeflateCompressBound API is called with input size > 477218588 bytes incorrect buffer size is returned. For any buffer input size, the API should not produce output buffer size greater than the max limit (4 GB). |
| Implication | Incorrect output buffer size is returned instead of error. |
| Resolution | Ensure input buffer sizes are less than maximum limit size (477218588 bytes). |
| Affected OS | Linux |
| Driver/Module | CPM-IA - Data Compression |
| Title | GEN - If PF device configuration is modified without restarting qatmgr, undefined behavior may occur. |
|---|---|
| Reference # | QATE-76073 |
| Description | When qatmgr is initialized, it reads the current configuration of the PF device. If the PF device configuration is modified without restarting the qatmgr, the updated device configuration is not comprehended by qatmgr. |
| Implication | Undefined behavior may occur. |
| Resolution | If PF device is reconfigured and reloaded, ensure to stop and start the qatmgr. |
| Affected OS | Linux |
| Driver/Module | CPM-IA - General |
| Title | GEN - Multi-process applications running in guest will fail when running with default Policy settings. |
|---|---|
| Reference # | QATE-76698 |
| Description | The default Policy setting results in process receiving all available VFs allocated to guest operating system. In the case of a multi-process application, failures will be observed as all available QAT resources are consumed by the first process. |
| Implication | Multi-process applications running in guest OS will fail with default Policy settings. |
| Resolution | If more than 1 process is needed in a guest OS, set POLICY=n (where n>0) in /etc/sysconfig/qat and restart qatmgr. The process will then receive n VFs. |
| Affected OS | Linux |
| Driver/Module | CPM-IA - General |
Resolved issues relating to the Intel® QAT software are described in this section.
| Issue ID | Description |
|---|---|
| QATE-76846 | GEN - Forking and re-initialising use-cases do not work |
| Title | GEN - Forking and re-initialising use-cases do not work |
|---|---|
| Reference # | QATE-76846 |
| Description | Forking and re-initialising use-cases do not work: -icp_sal_userStart()/icp_sal_userStop()/icp_sal_userStart() in single process -icp_sal_userStart()/fork()/icp_sal_userStart() in child. This is the usecase in openssh + QAT_Engine. |
| Implication | The process will have undefined behaviour in these use-cases. |
| Resolution | This issue is resolved with the 21.08 release. If using release prior to this release and using these flows, call qaeMemDestroy() immediately after icp_sal_userStop() to prevent this issue. |
| Affected OS | Linux |
| Driver/Module | CPM-IA - General |
- This product is released under the BSD-3-Clause.
Intel, Intel Atom, and Xeon are trademarks of Intel Corporation in the U.S. and/or other countries.
*Other names and brands may be claimed as the property of others.
Copyright © 2016-2021, Intel Corporation. All rights reserved.
| Term | Description |
|---|---|
| API | Application Programming Interface |
| BIOS | Basic Input/Output System |
| BSD | Berkeley Standard Distribution |
| CY | Cryptographic |
| CnV | Compress and Verify |
| CnVnR | Compress and Verify and Recover |
| DC | Compression |
| DMA | Direct Memory Access |
| EFI | Extensible Firmware Interface |
| FW | Firmware |
| GPL | General Public License |
| HKDF | HMAC-based Extract-and-Expand Key Derivation Function |
| Intel® QAT | Intel® QuickAssist Technology |
| OS | Operating System |
| SR-IOV | Single-root Input/Output Virtualization |
| TLS | Transport Layer Security |
| VFs | Virtual Functions |