[dpdk-dev] [PATCH] crypto/qat: fix not included release note for coalescing feature

[Arek Kusztal <arkadiuszx.kusztal@intel.com>]

This patch fixes not included in original patch release note

Fixes: 6cde900bd59d ("common/qat: remove tail write coalescing")

Signed-off-by: Arek Kusztal <arkadiuszx.kusztal@intel.com>
---
 doc/guides/rel_notes/release_20_02.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/doc/guides/rel_notes/release_20_02.rst b/doc/guides/rel_notes/release_20_02.rst
index d19a7f5..661969c 100644
--- a/doc/guides/rel_notes/release_20_02.rst
+++ b/doc/guides/rel_notes/release_20_02.rst
@@ -184,6 +184,15 @@ Removed Items
   the Technical Board decided to disable all the kernel modules
   by default from 20.02 version.
 
+* **Removed coalescing feature from Intel QuickAssist Technology (QAT) PMD.**
+
+  The internal tail write coalescing feature was removed as not compatible with
+  dual-thread feature. It was replaced with a threshold feature. At busy times
+  if only a small	number of packets can be enqueued, each enqueue causes
+  an expensive MMIO write. These MMIO write occurrences can be optimised by using
+  the new threshold parameter	on process start. Please see qat documentation for
+  more details.
+
 
 API Changes
 -----------
-- 
2.1.0