Add support for Data Digest

README.md

@@ -45,6 +45,7 @@ Username and password for bidirectional CHAP authentication:
 target_user=<account>
 target_password=<password>
 header_digest=<crc32c|none>
+data_digest=<crc32c|none>
 Transport:
 iser
 
@@ -125,6 +126,15 @@ be overridden by an application by calling iscsi_set_header_digest() if the
 application wants to force a specific setting.
 
 
+Data Digest
+===========
+
+Libiscsi supports DataDigest.  By default, libiscsi will offer None so that
+Data digest will not be used, no matter what the target setting is.  This can
+be overridden by an application by calling iscsi_set_data_digest() if the
+application wants to force a specific setting.
+
+
 Patches
 =======