Changeset 17183 in vbox for trunk

Timestamp:

Feb 26, 2009 9:17:18 PM (16 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

43469

Message:

#3681: GRUB DHCP fix: fake TX descriptor write-back bursting.

File:

• trunk/src/VBox/Devices/Network/DevE1000.cpp (modified) (2 diffs)

trunk/src/VBox/Devices/Network/DevE1000.cpp

@@ -226 +226 @@
 AssertCompileSize(PBAST, 4);
 
+#define TXDCTL_WTHRESH_MASK   0x003F0000
+#define TXDCTL_WTHRESH_SHIFT  16
 #define TXDCTL_LWTHRESH_MASK  0xFE000000
 #define TXDCTL_LWTHRESH_SHIFT 25
@@ -2908 +2910 @@
 static void e1kDescReport(E1KSTATE* pState, E1KTXDESC* pDesc, RTGCPHYS addr)
 {
-    /* Note: We do not support descriptor write-back bursting. */
+    /*
+     * We fake descriptor write-back bursting. Descriptors are written back as they are
+     * processed.
+     */
     /* Let's pretend we process descriptors. Write back with DD set. */
-    if (pDesc->legacy.cmd.fRS)
+    if (pDesc->legacy.cmd.fRS || (GET_BITS(TXDCTL, WTHRESH) > 0))
     {
         pDesc->legacy.dw3.fDD = 1; /* Descriptor Done */