1 files changed, 43 insertions, 0 deletions
diff --git a/libs/afalg_engine/Config.in b/libs/afalg_engine/Config.in
new file mode 100644
index 000000000..ed67f5203
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+++ b/libs/afalg_engine/Config.in
@@ -0,0 +1,43 @@
+if PACKAGE_libopenssl-afalg_sync
+    comment "Build Options"
+
+    config AFALG_DIGESTS
+	bool "Build support for digest acceleration"
+	help
+	    Digests are fast in software, and accessing AF_ALG adds latency, so
+	    you'll need a large request (16KB) just to match software speed.
+	    This increases memory usage, and has problems when process fork
+	    with open digest contexts (openssh will not work because of it).
+
+    config AFALG_FALLBACK
+	bool "Enable software fallback feature"
+	default y
+	help
+	    Use software to fulfill small requests.  Using AF_ALG adds latency,
+	    which makes it slow to perform small requests.  Enabling this
+	    option overcomes this problem, at the cost of increased memory
+	    and CPU usage.  This is a new, experimental feature; if you
+	    encounter any problem, this is the first option to disable.
+	    The fallback will fail if you enable this engine alongside
+	    devcrypto, so you'll not be able to install both at the same
+	    time if this option is enabled.
+
+    config AFALG_UPDATE_CTR_IV
+	bool "Don't rely on kernel to update CTR IV"
+	default y
+	help
+	    Don't count on the kernel driver to update the CTR-mode counter
+	    (IV).  At least one driver does not update the IV as a workaround
+	    for DMA issues.  With this option turned on, the engine will keep
+	    track of the counter, and the IV will be sent with every update.
+	    If fallback is enabled, then the counter needs to be updated by
+	    the engine anyway, and sent with the request everytime there's a
+	    switch from software to hardware, so this won't bring much gain in
+	    that case.
+
+    config AFALG_ZERO_COPY
+	bool "Use Zero-Copy Mode"
+	help
+	    Uses a Zero-Copy interface.  Even though it is supposed to improve
+	    performance, actual measurements indicate otherwise.
+endif