compress/qat: support IM buffer too small operation

[dpdk.git] / doc / guides / cryptodevs / qat.rst

diff --git a/doc/guides/cryptodevs/qat.rst b/doc/guides/cryptodevs/qat.rst
index c79e686debba7e3ff0c129374d7a39e416263b73..4ea7985a78b4c4daaba3baa4701daa906d21f41c 100644 (file)
--- a/doc/guides/cryptodevs/qat.rst
+++ b/doc/guides/cryptodevs/qat.rst
@@ -260,8 +260,11 @@ allocated while for GEN1 devices, 12 buffers are allocated, plus 1472 bytes over
 .. Note::
 
        If the compressed output of a Deflate operation using Dynamic Huffman
-        Encoding is too big to fit in an intermediate buffer, then the
-       operation will fall back to fixed compression rather than failing the operation.
+       Encoding is too big to fit in an intermediate buffer, then the
+       operation will be split into smaller operations and their results will
+       be merged afterwards.
+       This is not possible if any checksum calculation was requested - in such
+       case the code falls back to fixed compression.
        To avoid this less performant case, applications should configure
        the intermediate buffer size to be larger than the expected input data size
        (compressed output size is usually unknown, so the only option is to make