[PATCH v3 12/16] e1000: Support RX-FCS flag.
From: <hidden>
Date: 2012-02-11 01:04:54
Subsystem:
intel ethernet drivers, networking drivers, the rest · Maintainers:
Tony Nguyen, Przemek Kitszel, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Ben Greear <redacted> This allows the NIC to pass the Ethernet Frame Checksum (FCS) up the stack. Useful when sniffing packets. Signed-off-by: Ben Greear <redacted> --- :100644 100644 59b8207... f4eec77... M drivers/net/ethernet/intel/e1000/e1000_main.c drivers/net/ethernet/intel/e1000/e1000_main.c | 20 ++++++++++---------- 1 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index 59b8207..f4eec77 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c@@ -1073,6 +1073,7 @@ static int __devinit e1000_probe(struct pci_dev *pdev, netdev->features |= netdev->hw_features; netdev->hw_features |= NETIF_F_RXCSUM; netdev->hw_features |= NETIF_F_RXALL; + netdev->hw_features |= NETIF_F_RXFCS; if (pci_using_dac) { netdev->features |= NETIF_F_HIGHDMA;
@@ -4158,10 +4159,9 @@ process_skb: ((u32)(rx_desc->errors) << 24), le16_to_cpu(rx_desc->csum), skb); - pskb_trim(skb, skb->len - 4); - - /* probably a little skewed due to removing CRC */ - total_rx_bytes += skb->len; + total_rx_bytes += (skb->len - 4); /* don't count FCS */ + if (likely(!(netdev->features & NETIF_F_RXFCS))) + pskb_trim(skb, skb->len - 4); total_rx_packets++; /* eth type trans needs skb->data to point to something */
@@ -4318,14 +4318,14 @@ static bool e1000_clean_rx_irq(struct e1000_adapter *adapter, } process_skb: - /* adjust length to remove Ethernet CRC, this must be - * done after the TBI_ACCEPT workaround above */ - length -= 4; - - /* probably a little skewed due to removing CRC */ - total_rx_bytes += length; + total_rx_bytes += (length - 4); /* don't count FCS */ total_rx_packets++; + if (likely(!(netdev->features & NETIF_F_RXFCS))) + /* adjust length to remove Ethernet CRC, this must be + * done after the TBI_ACCEPT workaround above */ + length -= 4; + e1000_check_copybreak(netdev, buffer_info, length, &skb); skb_put(skb, length);
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1.7.3.4