e1000e: Support sending custom Ethernet CRC.
This can aid with testing the RX logic for bad
CRCs.
Signed-off-by: Ben Greear <greearb@candelatech.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 30c8c15..340442c 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -4613,6 +4613,7 @@
#define E1000_TX_FLAGS_VLAN 0x00000002
#define E1000_TX_FLAGS_TSO 0x00000004
#define E1000_TX_FLAGS_IPV4 0x00000008
+#define E1000_TX_FLAGS_NO_FCS 0x00000010
#define E1000_TX_FLAGS_VLAN_MASK 0xffff0000
#define E1000_TX_FLAGS_VLAN_SHIFT 16
@@ -4872,6 +4873,9 @@
txd_upper |= (tx_flags & E1000_TX_FLAGS_VLAN_MASK);
}
+ if (unlikely(tx_flags & E1000_TX_FLAGS_NO_FCS))
+ txd_lower &= ~(E1000_TXD_CMD_IFCS);
+
i = tx_ring->next_to_use;
do {
@@ -4889,6 +4893,10 @@
tx_desc->lower.data |= cpu_to_le32(adapter->txd_cmd);
+ /* txd_cmd re-enables FCS, so we'll re-disable it here as desired. */
+ if (unlikely(tx_flags & E1000_TX_FLAGS_NO_FCS))
+ tx_desc->lower.data &= ~(cpu_to_le32(E1000_TXD_CMD_IFCS));
+
/*
* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch. (Only
@@ -5094,6 +5102,9 @@
if (skb->protocol == htons(ETH_P_IP))
tx_flags |= E1000_TX_FLAGS_IPV4;
+ if (unlikely(skb->no_fcs))
+ tx_flags |= E1000_TX_FLAGS_NO_FCS;
+
/* if count is 0 then mapping error has occurred */
count = e1000_tx_map(tx_ring, skb, first, max_per_txd, nr_frags, mss);
if (count) {
@@ -6221,6 +6232,7 @@
/* Set user-changeable features (subset of all device features) */
netdev->hw_features = netdev->features;
netdev->hw_features |= NETIF_F_RXFCS;
+ netdev->priv_flags |= IFF_SUPP_NOFCS;
if (adapter->flags & FLAG_HAS_HW_VLAN_FILTER)
netdev->features |= NETIF_F_HW_VLAN_FILTER;