Back to 16 bit arithmetic

doc/plan.org

@@ -5309,6 +5309,25 @@ This is used to correct endianness!
 
 -> not needed in our case
 
+*** TODO 2019-07-16: Wraptest in P4
+#+BEGIN_CENTER
+ mx h3
+arp -s 10.0.0.2 00:00:0a:00:00:02
+echo V4-OK | socat - TCP:10.0.0.2:2342
+
+#+END_CENTER
+
+Result on the wire of the wraptest:
+#+BEGIN_CENTER
+10.0.0.3.60106 > 10.0.0.2.2342: Flags [S], cksum 0x0001 (incorrect ->
+0xc7f9), seq 3677403557, win 28380, options [mss 9460
+,sackOK,TS val 2328087128 ecr 0,nop,wscale 9], length 0
+#+END_CENTER
+
+0xffff + 2 = 1
+-> as expected
+
+Thus carryover is already implemented. Try to use 16 bit ints
 ** The NetPFGA saga
 Problems encountered:
 - The logfile for a compile run is 10k+ lines