r8169: Support RX-FCS flag.

This allows the NIC to receive the Ethernet FCS
and pass it up the stack, allowing sniffers and
other interested programs to inspect the FCS.

Signed-off-by: Ben Greear <greearb@candelatech.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 0517a6a252f1..fbd855bcd9f0 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -4186,6 +4186,7 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
                 dev->hw_features &= ~NETIF_F_HW_VLAN_RX;
 
         dev->hw_features |= NETIF_F_RXALL;
+        dev->hw_features |= NETIF_F_RXFCS;
 
         tp->hw_start = cfg->hw_start;
         tp->event_slow = cfg->event_slow;
@@ -5773,7 +5774,10 @@ static int rtl_rx(struct net_device *dev, struct rtl8169_private *tp, u32 budget
 
 process_pkt:
                         addr = le64_to_cpu(desc->addr);
-                        pkt_size = (status & 0x00003fff) - 4;
+                        if (likely(!(dev->features & NETIF_F_RXFCS)))
+                                pkt_size = (status & 0x00003fff) - 4;
+                        else
+                                pkt_size = status & 0x00003fff;
 
                         /*
                          * The driver does not support incoming fragmented