bge(4) local patch to disable TSO4 ifconfig property in src

--- sys/dev/bge/if_bge.c.orig   2010-06-13 19:09:06.000000000 -0700
+++ sys/dev/bge/if_bge.c    2013-05-24 10:33:11.000000000 -0700
@@ -32,14 +32,14 @@
  */

 #include <sys/cdefs.h>
-__FBSDID("$FreeBSD: src/sys/dev/bge/if_bge.c,v 1.226.2.23.2.1 2010/06/14 02:09:06 kensmith Exp $");
+__FBSDID("$FreeBSD: stable/8/sys/dev/bge/if_bge.c 250651 2013/05/15 01:22:55Z yongari $");

 /*
  * Broadcom BCM570x family gigabit ethernet driver for FreeBSD.
 [HUGE SNIP]
@@ -2840,12 +3704,20 @@ bge_attach(device_t dev)
    ifp->if_snd.ifq_drv_maxlen = BGE_TX_RING_CNT - 1;
    IFQ_SET_MAXLEN(&ifp->if_snd, ifp->if_snd.ifq_drv_maxlen);
    IFQ_SET_READY(&ifp->if_snd);
-   ifp->if_hwassist = BGE_CSUM_FEATURES;
+   ifp->if_hwassist = sc->bge_csum_features;
    ifp->if_capabilities = IFCAP_HWCSUM | IFCAP_VLAN_HWTAGGING |
        IFCAP_VLAN_MTU;
-   if ((sc->bge_flags & BGE_FLAG_TSO) != 0) {
+   if ((sc->bge_flags & (BGE_FLAG_TSO | BGE_FLAG_TSO3)) != 0) {
        ifp->if_hwassist |= CSUM_TSO;
+/* TSO4 considered unstable as-of SVN stable/8 revision 250651.
+ * An extreme amount of TCP traffic (or heavy amount of UDP traffic
+ * according to smh) can act as a remote Denial-of-Service attack
+ * causing a RESET of the NIC, losing communicatin for 90s (dteske) */
+#if 0
        ifp->if_capabilities |= IFCAP_TSO4 | IFCAP_VLAN_HWTSO;
+#else
+       ifp->if_capabilities |= IFCAP_VLAN_HWTSO;
+# endif
    }
 #ifdef IFCAP_VLAN_HWCSUM
    ifp->if_capabilities |= IFCAP_VLAN_HWCSUM;
 [HUGE SNIP]