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32 .Nd Intel QuickAssist Technology (QAT) driver for Atom C2000 chipsets
34 To compile this driver into the kernel,
35 place the following lines in your
36 kernel configuration file:
37 .Bd -ragged -offset indent
39 .Cd "device cryptodev"
43 Alternatively, to load the driver as a
44 module at boot time, place the following lines in
46 .Bd -literal -offset indent
48 qat_c2xxxfw_load="YES"
55 support for some of the cryptographic acceleration functions of the Intel
56 QuickAssist (QAT) device found on Atom C2000 devices.
57 QAT devices are enumerated through PCIe and are thus visible in
63 driver can accelerate AES in CBC, CTR, and GCM modes,
64 and can perform authenticated encryption combining the CBC, and CTR modes
65 with SHA1-HMAC and SHA2-HMAC.
68 driver can also compute SHA1 and SHA2 digests.
69 The implementation of AES-GCM has a firmware-imposed constraint that the length
70 of any additional authenticated data (AAD) must not exceed 240 bytes.
71 The driver thus rejects
73 requests that do not satisfy this constraint.
85 driver first appeared in
90 driver was written for
93 .An Hikaru Abe Aq Mt hikaru@iij.ad.jp .
94 .An Mark Johnston Aq Mt markj@FreeBSD.org
98 Some Atom C2000 QAT devices have two acceleration engines instead of one.
101 driver currently misbehaves when both are enabled and thus does not enable
102 the second acceleration engine if one is present.