---
name: "qat_c2xxx"
section: "4"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/qat_c2xxx"
---

# qat\_c2xxx(4)

Intel QuickAssist Technology crypto driver for Atom C2000

## NAME

**qat\_c2xxx** – Intel QuickAssist Technology crypto driver for Atom C2000

## SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file:

**device crypto** **device cryptodev** **device qat**

Alternatively, to load the driver as a module at boot time, place the following lines in [loader.conf(5)](/loader.conf/5.md):

```
qat_c2xxx_load="YES"
qat_c2xxxfw_load="YES"
```

## DESCRIPTION

The **qat\_c2xxx** driver implements [crypto(4)](/crypto/4.md) support for some of the cryptographic acceleration functions of the Intel QuickAssist (QAT) device found on Atom C2000 devices. QAT devices are enumerated through PCIe and are thus visible in [pciconf(8)](/pciconf/8.md) output.

The **qat\_c2xxx** driver can accelerate AES in CBC, CTR, and GCM modes, and can perform authenticated encryption combining the CBC, and CTR modes with SHA1-HMAC and SHA2-HMAC. The **qat\_c2xxx** driver can also compute SHA1 and SHA2 digests. The implementation of AES-GCM has a firmware-imposed constraint that the length of any additional authenticated data (AAD) must not exceed 240 bytes. The driver thus rejects [crypto(9)](/crypto/9.md) requests that do not satisfy this constraint.

## SEE ALSO

[crypto(4)](/crypto/4.md), [ipsec(4)](/ipsec/4.md), [pci(4)](/pci/4.md), [qat(4)](/qat/4.md), [random(4)](/random/4.md), [crypto(7)](/crypto/7.md), [crypto(9)](/crypto/9.md)

## HISTORY

The **qat\_c2xxx** driver first appeared in FreeBSD 13.0.

## AUTHORS

The **qat\_c2xxx** driver was written for NetBSD by Hikaru Abe ⟨*hikaru@iij.ad.jp*⟩. Mark Johnston ⟨*markj@FreeBSD.org*⟩ ported the driver to FreeBSD.

## BUGS

Some Atom C2000 QAT devices have two acceleration engines instead of one. The **qat\_c2xxx** driver currently misbehaves when both are enabled and thus does not enable the second acceleration engine if one is present.