tg3: Fix UDP fragments treated as RMCP

The 5762 devices sometimes incorrectly treat udp fragments as RMCP
packets and route to the APE. This patch sets the RX_MODE_IPV4_FRAG_FIX
bit for these devices which enables the proper behaviour.

Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index f077c8f5baa1..6e59ef1ba13e 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -10420,6 +10420,9 @@ static int tg3_reset_hw(struct tg3 *tp, bool reset_phy)
         if (tg3_flag(tp, 5755_PLUS))
                 tp->rx_mode |= RX_MODE_IPV6_CSUM_ENABLE;
 
+        if (tg3_asic_rev(tp) == ASIC_REV_5762)
+                tp->rx_mode |= RX_MODE_IPV4_FRAG_FIX;
+
         if (tg3_flag(tp, ENABLE_RSS))
                 tp->rx_mode |= RX_MODE_RSS_ENABLE |
                                RX_MODE_RSS_ITBL_HASH_BITS_7 |
diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h
index 2e0f3d34ea5d..ddb8be1298ea 100644
--- a/drivers/net/ethernet/broadcom/tg3.h
+++ b/drivers/net/ethernet/broadcom/tg3.h
@@ -532,6 +532,7 @@
 #define  RX_MODE_RSS_ITBL_HASH_BITS_7    0x00700000
 #define  RX_MODE_RSS_ENABLE              0x00800000
 #define  RX_MODE_IPV6_CSUM_ENABLE        0x01000000
+#define  RX_MODE_IPV4_FRAG_FIX           0x02000000
 #define MAC_RX_STATUS                   0x0000046c
 #define  RX_STATUS_REMOTE_TX_XOFFED      0x00000001
 #define  RX_STATUS_XOFF_RCVD             0x00000002