Here is a somewhat improved patch for tweaking the behaviour of the bridge
code with respect to disabling the hardware-assist-checksum features of
driver instances which are members of the bridge.
I don't make use of the bridge code so I'd appreciate it if others who do
could test this patch.
To disable *all* capabilities, setting net.link.ether.bridge.hwassmask to
0 should suffice.
Regards,
BMS
This patch implements a sysctl MIB variable, net.link.ether.bridge.hwassmask,
which may be used to specify a bitmask which is applied to each member
interface of a bridge to selectively disable interface hardware assist
capabilities, and provides finer run-time control over such behaviour.
Index: bridge.c
===================================================================
RCS file: /home/ncvs/src/sys/net/bridge.c,v
retrieving revision 1.79
diff -u -p -r1.79 bridge.c
--- bridge.c 15 Jun 2004 23:57:41 -0000 1.79
+++ bridge.c 3 Jul 2004 17:33:47 -0000
@@ -204,6 +204,10 @@ SYSCTL_NODE(_net_link_ether, OID_AUTO, b
static char bridge_version[] = "031224";
SYSCTL_STRING(_net_link_ether_bridge, OID_AUTO, version, CTLFLAG_RD,
bridge_version, 0, "software version");
+static u_long bridge_hwassmask = 0xFFFFFFFFUL;
+SYSCTL_ULONG(_net_link_ether_bridge, OID_AUTO, hwassmask, CTLFLAG_RW,
+ &bridge_hwassmask, 0,
+ "Mask to apply to if_hwassist field for bridge interfaces");
#define BRIDGE_DEBUG
#ifdef BRIDGE_DEBUG
@@ -391,6 +395,7 @@ bridge_off(void)
if ( b->flags & IFF_BDG_PROMISC ) {
ifpromisc(ifp, 0);
+ ifp->if_hwassist = b->hwassist;
b->flags &= ~(IFF_BDG_PROMISC|IFF_MUTE) ;
DPRINTF(("%s: %s promisc OFF if_flags 0x%x "
"bdg_flags 0x%x\n", __func__, ifp->if_xname,
@@ -433,6 +438,8 @@ bridge_on(void)
if_up(ifp);
}
if ( !(b->flags & IFF_BDG_PROMISC) ) {
+ b->hwassist = ifp->if_hwassist;
+ ifp->if_hwassist &= bridge_hwassmask;
(void) ifpromisc(ifp, 1);
b->flags |= IFF_BDG_PROMISC ;
DPRINTF(("%s: %s promisc ON if_flags 0x%x bdg_flags 0x%x\n",
Index: bridge.h
===================================================================
RCS file: /home/ncvs/src/sys/net/bridge.h,v
retrieving revision 1.12
diff -u -p -r1.12 bridge.h
--- bridge.h 15 Nov 2002 00:00:14 -0000 1.12
+++ bridge.h 3 Jul 2004 17:26:44 -0000
@@ -48,6 +48,7 @@ struct bdg_softc {
#define IFF_MUTE 0x0002 /* mute this if for bridging. */
#define IFF_USED 0x0004 /* use this if for bridging. */
struct cluster_softc *cluster;
+ u_long hwassist; /* saved ifp->if_hwassist field */
} ;
extern struct bdg_softc *ifp2sc;
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