igb: never generate both software and hardware timestamps

skb_tx_timestamp() does not report software time stamp
if SKBTX_IN_PROGRESS is set. According to timestamping.txt
software time stamps are a fallback and should not be
generated if hardware time stamp is provided.

Move call to skb_tx_timestamp() after setting
SKBTX_IN_PROGRESS.

Signed-off-by: Jakub Kicinski <kubakici@wp.pl>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index cd20409858d1..1fdffa20fe97 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -4980,8 +4980,6 @@ netdev_tx_t igb_xmit_frame_ring(struct sk_buff *skb,
         first->bytecount = skb->len;
         first->gso_segs = 1;
 
-        skb_tx_timestamp(skb);
-
         if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
                 struct igb_adapter *adapter = netdev_priv(tx_ring->netdev);
 
@@ -4996,6 +4994,8 @@ netdev_tx_t igb_xmit_frame_ring(struct sk_buff *skb,
                 }
         }
 
+        skb_tx_timestamp(skb);
+
         if (vlan_tx_tag_present(skb)) {
                 tx_flags |= IGB_TX_FLAGS_VLAN;
                 tx_flags |= (vlan_tx_tag_get(skb) << IGB_TX_FLAGS_VLAN_SHIFT);