add hw_cs

diff --git a/release_notes.asciidoc b/release_notes.asciidoc
index 7581459..051e379 100755 (executable)
--- a/release_notes.asciidoc
+++ b/release_notes.asciidoc
@@ -27,7 +27,9 @@ endif::backend-docbook[]
 
 * Statless, split to core algorithm is more accurate and simple see link:trex_stateless.html#_tutorial_field_engine_split_to_core[split_to_core] 
 * Add repeatable random instruction see an example link:https://github.com/cisco-system-traffic-generator/trex-core/tree/master/scripts/api/stl/udp_1pkt_repeat_random.py[stl/udp_1pkt_repeat_random.py] link:cp_stl_docs/api/field_engine.html#stlvmflowvarrepetablerandom[repetable_random] and link:trex_rpc_server_spec.html#_repetable_random[repetable_random_spec]
-* Support dual mode for push pcap/remote Python API. see here link:cp_stl_docs/api/client_code.html#trex_stl_lib.trex_stl_client.STLClient.push_remote[push_remote] and link:cp_stl_docs/api/client_code.html#trex_stl_lib.trex_stl_client.STLClient.push_pcap[push_pcap] Using this feature pcap can be sent to client/server ports
+* Add TCP/UDP checksum fix instruction see an example link:https://github.com/cisco-system-traffic-generator/trex-core/tree/master/scripts/api/stl/syn_attack_fix_cs_hw.py[stl/syn_attack_fix_cs_hw.py] link:cp_stl_docs/api/field_engine.html#stlvmfixchecksumhw[fix checksum] and link:trex_rpc_server_spec.html#_fix_checksum_hw[fix_checksum_hw_spec]
+* Improve Stateless Field Engine (FE) performance
+* Support dual mode for push pcap/remote Python API. see here link:cp_stl_docs/api/client_code.html#trex_stl_lib.trex_stl_client.STLClient.push_remote[push_remote] and link:cp_stl_docs/api/client_code.html#trex_stl_lib.trex_stl_client.STLClient.push_pcap[push_pcap] Using this feature pcap can be splited to client/server ports
 * Add infra for L2 emulation support 
 
 === fix issues: ===

diff --git a/trex_rpc_server_spec.asciidoc b/trex_rpc_server_spec.asciidoc
index e7c669c..0e49783 100755 (executable)
--- a/trex_rpc_server_spec.asciidoc
+++ b/trex_rpc_server_spec.asciidoc
@@ -666,6 +666,20 @@ an Object that include instructions array and properties of the field engine pro
 Array of VM instruction objects to be used with this stream
 Any element in the array can be one of the following object types:
 
+===== fix_checksum_hw
+
+Fix TCP/UDP and IPv4 headers using hardware assit engine 
+
+.Object type 'vm - fix_checksum_hw'
+[options="header",cols="1,1,3"]
+|=================
+| Field       | Type        | Description
+| type        | string      | ''fix_checksum_hw''
+| l2_len      | uint16      | len of L2 (e.g. 14 Ether)
+| l3_len      | uint16      | len of l3 header (e.g. 20 for IP)
+| l4_type     | uint16      | the type of L4 header either UDP or TCP ( L4_TYPE_UDP = 11 | L4_TYPE_TCP = 13)
+|=================
+
 ===== fix_checksum_ipv4
 
 .Object type 'vm - fix_checksum_ipv4'