fix vm bug with packet size bigger than 128 and field<33

3 files changed, 6 insertions, 6 deletions

diff --git a/scripts/exp/stl_vm_enable1-0-ex.erf b/scripts/exp/stl_vm_enable1-0-ex.erf
index d40539e9..3ccf49ac 100644
--- a/scripts/exp/stl_vm_enable1-0-ex.erf
+++ b/scripts/exp/stl_vm_enable1-0-ex.erf
diff --git a/src/gtest/trex_stateless_gtest.cpp b/src/gtest/trex_stateless_gtest.cpp
index 2c55fc39..704a24b7 100644
--- a/src/gtest/trex_stateless_gtest.cpp
+++ b/src/gtest/trex_stateless_gtest.cpp
@@ -148,11 +148,11 @@ TEST_F(basic_vm, pkt_size) {
     EXPECT_EQ(calc_writable_mbuf_size(45,65),65);
     EXPECT_EQ(calc_writable_mbuf_size(66,65),65);
     EXPECT_EQ(calc_writable_mbuf_size(62,128),128);
-    EXPECT_EQ(calc_writable_mbuf_size(62,252),61);
-    EXPECT_EQ(calc_writable_mbuf_size(121,252),120);
-    EXPECT_EQ(calc_writable_mbuf_size(253,252),252);
+    EXPECT_EQ(calc_writable_mbuf_size(62,252),63);
+    EXPECT_EQ(calc_writable_mbuf_size(121,252),122);
+    EXPECT_EQ(calc_writable_mbuf_size(253,252),254);
     EXPECT_EQ(calc_writable_mbuf_size(250,252),252);
-    EXPECT_EQ(calc_writable_mbuf_size(184,252),183);
+    EXPECT_EQ(calc_writable_mbuf_size(184,252),185);
 }
 
 
diff --git a/src/stateless/cp/trex_stream.h b/src/stateless/cp/trex_stream.h
index 80d64ec5..e854cdf7 100644
--- a/src/stateless/cp/trex_stream.h
+++ b/src/stateless/cp/trex_stream.h
@@ -77,11 +77,11 @@ static inline uint16_t calc_writable_mbuf_size(uint16_t max_offset_writable,
     }
 
     //pkt_size> 128
-    uint16_t non_writable = pkt_size - (max_offset_writable -1) ;
+    uint16_t non_writable = pkt_size - (max_offset_writable +1) ;
     if ( non_writable<64 ) {
         return (pkt_size);
     }
-    return(max_offset_writable-1);
+    return(max_offset_writable+1);
 }