netxen: fix promisc mode, mtu setting

For NX3031, multicast filtering, promisc mode, and max frame size
setting is handled by firmware, driver needs to send request to
enable/disable it.

For old chip revisions / firmware, driver still sets it directly.

Added function pointer to set mtu according to chip revision.

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/netxen/netxen_nic_ctx.c b/drivers/net/netxen/netxen_nic_ctx.c
index 64babc5..64b5164 100644
--- a/drivers/net/netxen/netxen_nic_ctx.c
+++ b/drivers/net/netxen/netxen_nic_ctx.c
@@ -145,8 +145,8 @@
 	return rcode;
 }
 
-u32
-nx_fw_cmd_set_mtu(struct netxen_adapter *adapter, u32 mtu)
+int
+nx_fw_cmd_set_mtu(struct netxen_adapter *adapter, int mtu)
 {
 	u32 rcode = NX_RCODE_SUCCESS;
 	struct netxen_recv_context *recv_ctx = &adapter->recv_ctx[0];
@@ -160,7 +160,10 @@
 				0,
 				NX_CDRP_CMD_SET_MTU);
 
-	return rcode;
+	if (rcode != NX_RCODE_SUCCESS)
+		return -EIO;
+
+	return 0;
 }
 
 static int