From 4a47d307c77d5a3d641e13580ca9e5e81b5d12ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9my=20GIBERT?= <burniouf@users.noreply.github.com>
Date: Mon, 18 Apr 2016 22:16:54 +0200
Subject: [PATCH] LIBTCPIP:implementing IP offloading

---
 LIB/LIBTCPIP.S.FRM.txt | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/LIB/LIBTCPIP.S.FRM.txt b/LIB/LIBTCPIP.S.FRM.txt
index 419a8152..c07df8a5 100644
--- a/LIB/LIBTCPIP.S.FRM.txt
+++ b/LIB/LIBTCPIP.S.FRM.txt
@@ -82,6 +82,10 @@ NEW.IP.FRAME	>PUSHWI K.ETH.FRAME.LEN
 				bcs .9
 				>STYA ZPFrameBase1
 
+				lda DevFlags
+				and #S.DEVINFO.NET.FLAGS.IPOFFLOAD
+				bne .9
+				
 				ldy #S.ETH.ETHERTYPE
 				lda /S.ETH.ETHERTYPE.IP
 				sta (ZPFrameBase1),y		
@@ -111,7 +115,6 @@ NEW.IP.FRAME	>PUSHWI K.ETH.FRAME.LEN
 				lda #K.IP.TTL
 				sta (ZPFrameBase1),y
 				>LDYA ZPFrameBase1
-				clc
 .9				rts
 *--------------------------------------
 SEND.ICMP.FRAME	>PULLW ZPFrameBase1
@@ -163,8 +166,9 @@ SEND.UDP.FRAME.I
 SEND.IP.FRAME	>PULLW ZPFrameBase1
 				jsr FRM.GetLen1
 				stz hFrame1
-SEND.IP.FRAME.I	ldx #3
-				ldy #S.IP.SRC+3
+				
+SEND.IP.FRAME.I	ldx #3					Copy SRC.IP even if IP offload
+				ldy #S.IP.SRC+3			for proper UDP/TCP CRC calculation
 				
 .1				lda IPCFG+S.IPCFG.IP,x
 				sta (ZPFrameBase1),y	
@@ -172,6 +176,10 @@ SEND.IP.FRAME.I	ldx #3
 				dex
 				bpl .1
 				
+				lda DevFlags
+				and #S.DEVINFO.NET.FLAGS.IPOFFLOAD
+				bne .21
+				
 				ldy #S.IP.TOTAL.LENGTH+1
 				lda ZPFrameLen1
 				sec
@@ -219,7 +227,7 @@ SEND.IP.FRAME.I	ldx #3
 				eor #$FF
 				sta (ZPFrameBase1),y
 
-				ldy #S.IP.PROTOCOL
+.21				ldy #S.IP.PROTOCOL
 				lda (ZPFrameBase1),y
 				cmp #S.IP.PROTOCOL.TCP
 				bne .3