Add a helper to configure the first MDF filter for filtering the
broadcast Ethernet address.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
---
 Silicon/Broadcom/Drivers/Net/BcmGenetDxe/GenetUtil.h |  7 +++++
 Silicon/Broadcom/Drivers/Net/BcmGenetDxe/GenetUtil.c | 33 ++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/Silicon/Broadcom/Drivers/Net/BcmGenetDxe/GenetUtil.h b/Silicon/Broadcom/Drivers/Net/BcmGenetDxe/GenetUtil.h
index b21a284b6221..b491ea4665b0 100644
--- a/Silicon/Broadcom/Drivers/Net/BcmGenetDxe/GenetUtil.h
+++ b/Silicon/Broadcom/Drivers/Net/BcmGenetDxe/GenetUtil.h
@@ -107,6 +107,7 @@
 #define GENET_UMAC_MDF_CTRL                     0xe50
 #define GENET_UMAC_MDF_ADDR0(n)                 (0xe54 + (n) * 0x8)
 #define GENET_UMAC_MDF_ADDR1(n)                 (0xe58 + (n) * 0x8)
+#define GENET_MAX_MDF_FILTER                    17
 
 #define GENET_DMA_DESC_COUNT                    256
 #define GENET_DMA_DESC_SIZE                     12
@@ -300,6 +301,12 @@ GenetSetPromisc (
   IN BOOLEAN            Enable
   );
 
+VOID
+GenetEnableBroadcastFilter (
+  IN GENET_PRIVATE_DATA   *Genet,
+  IN BOOLEAN              Enable
+  );
+
 VOID
 GenetDmaInitRings (
   IN GENET_PRIVATE_DATA *Genet
diff --git a/Silicon/Broadcom/Drivers/Net/BcmGenetDxe/GenetUtil.c b/Silicon/Broadcom/Drivers/Net/BcmGenetDxe/GenetUtil.c
index 7ae9acec4c78..71c659e7f882 100644
--- a/Silicon/Broadcom/Drivers/Net/BcmGenetDxe/GenetUtil.c
+++ b/Silicon/Broadcom/Drivers/Net/BcmGenetDxe/GenetUtil.c
@@ -492,6 +492,39 @@ GenetSetPromisc (
   GenetMmioWrite (Genet, GENET_UMAC_CMD, Value);
 }
 
+/**
+  Enable the MAC filter for the Ethernet broadcast address
+
+  @param  Genet[in]   Pointer to GENET_PRIVATE_DATA.
+  @param  Enable[in]  Promiscuous mode state.
+
+**/
+VOID
+GenetEnableBroadcastFilter (
+  IN GENET_PRIVATE_DATA   *Genet,
+  IN BOOLEAN              Enable
+  )
+{
+  CONST EFI_MAC_ADDRESS   *MacAddr = &Genet->SnpMode.CurrentAddress;
+  UINT32                  Value;
+
+  if (Enable) {
+    GenetMmioWrite (Genet, GENET_UMAC_MDF_ADDR0 (0),
+      MacAddr->Addr[1] | MacAddr->Addr[0] << 8);
+    GenetMmioWrite (Genet, GENET_UMAC_MDF_ADDR1 (0),
+      MacAddr->Addr[5] | MacAddr->Addr[4] << 8 |
+      MacAddr->Addr[3] << 16 | MacAddr->Addr[2] << 24);
+
+    GenetMmioWrite (Genet, GENET_UMAC_MDF_ADDR0 (1), 0xffff);
+    GenetMmioWrite (Genet, GENET_UMAC_MDF_ADDR1 (1), 0xffffffff);
+
+    Value = (1U << GENET_MAX_MDF_FILTER) & ~(BIT1 | BIT0);
+  } else {
+    Value = 0;
+  }
+  GenetMmioWrite (Genet, GENET_UMAC_MDF_CTRL, Value);
+}
+
 /**
   Configure DMA TX and RX queues, enabling them.
 
--
2.17.1