ioemu: e1000: fix a TSE bug

Previously, all data descriptors used TSE context descriptor. It's not
correct, per spec, data descriptor uses TSE bit to indicate whether
use TSE. Legacy data descripter never use TSE.

Signed-off-by; Anthony Xu <anthony.xu@intel.com>

diff --git a/tools/ioemu/hw/e1000.c b/tools/ioemu/hw/e1000.c
index 48621f582fdaeeeded995db45511120a00c5db04..7375cef2471536c15792e86fc9e8dd9abc4f6d3a 100644 (file)
--- a/tools/ioemu/hw/e1000.c
+++ b/tools/ioemu/hw/e1000.c
@@ -103,6 +103,7 @@ typedef struct E1000State_st {
         char tse;
         char ip;
         char tcp;
+        char cptse;     //current packet tse bit
     } tx;
 
     struct {
@@ -306,7 +307,7 @@ xmit_seg(E1000State *s)
     unsigned int frames = s->tx.tso_frames, css, sofar, n;
     struct e1000_tx *tp = &s->tx;
 
-    if (tp->tse) {
+    if (tp->tse && tp->cptse) {
         css = tp->ipcss;
         DBGOUT(TXSUM, "frames %d size %d ipcss %d\n",
                frames, tp->size, css);
@@ -380,37 +381,49 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp)
             tp->tucso = tp->tucss + (tp->tcp ? 16 : 6);
         }
         return;
-    } else if (dtype == (E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D))
+    } else if (dtype == (E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D)){
+        // data descriptor
         tp->sum_needed = le32_to_cpu(dp->upper.data) >> 8;
+        tp->cptse = ( txd_lower & E1000_TXD_CMD_TSE ) ? 1 : 0;
+    } else
+        // legacy descriptor
+        tp->cptse = 0;
 
     addr = le64_to_cpu(dp->buffer_addr);
-    if (tp->tse) {
+    if (tp->tse && tp->cptse) {
         hdr = tp->hdr_len;
         msh = hdr + tp->mss;
+        do {
+            bytes = split_size;
+            if (tp->size + bytes > msh)
+                bytes = msh - tp->size;
+            cpu_physical_memory_read(addr, tp->data + tp->size, bytes);
+            if ((sz = tp->size + bytes) >= hdr && tp->size < hdr)
+                memmove(tp->header, tp->data, hdr);
+            tp->size = sz;
+            addr += bytes;
+            if (sz == msh) {
+                xmit_seg(s);
+                memmove(tp->data, tp->header, hdr);
+                tp->size = hdr;
+            }
+        } while (split_size -= bytes);
+    } else if (!tp->tse && tp->cptse) {
+        // context descriptor TSE is not set, while data descriptor TSE is set
+        DBGOUT(TXERR, "TCP segmentaion Error\n");
+    } else {
+        cpu_physical_memory_read(addr, tp->data + tp->size, split_size);
+        tp->size += split_size;
     }
-    do {
-        bytes = split_size;
-        if (tp->size + bytes > msh)
-            bytes = msh - tp->size;
-        cpu_physical_memory_read(addr, tp->data + tp->size, bytes);
-        if ((sz = tp->size + bytes) >= hdr && tp->size < hdr)
-            memmove(tp->header, tp->data, hdr);
-        tp->size = sz;
-        addr += bytes;
-        if (sz == msh) {
-            xmit_seg(s);
-            memmove(tp->data, tp->header, hdr);
-            tp->size = hdr;
-        }
-    } while (split_size -= bytes);
 
     if (!(txd_lower & E1000_TXD_CMD_EOP))
         return;
-    if (tp->size > hdr)
+    if (!(tp->tse && tp->cptse && tp->size < hdr))
         xmit_seg(s);
     tp->tso_frames = 0;
     tp->sum_needed = 0;
     tp->size = 0;
+    tp->cptse = 0;
 }
 
 static uint32_t