[v1,net-next] igb: Use an advanced ctx descriptor for launchtime

Message ID 20180726172038.11330-1-jesus.sanchez-palencia@intel.com
State Under Review
Delegated to: Jeff Kirsher
Headers show
  • [v1,net-next] igb: Use an advanced ctx descriptor for launchtime
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Commit Message

Jesus Sanchez-Palencia July 26, 2018, 5:20 p.m.
On i210, Launchtime (TxTime) requires the usage of an "Advanced
Transmit Context Descriptor" for retrieving the timestamp of a packet.

The igb driver correctly builds such descriptor on the segmentation
flow (i.e. igb_tso()) or on the checksum one (i.e. igb_tx_csum()), but the
feature is broken for AF_PACKET if the IGB_TX_FLAGS_VLAN is not set,
which happens due to an early return on igb_tx_csum().

This flag is only set by the kernel when a VLAN interface is used,
thus we can't just rely on it. Here we are fixing this issue by checking
if launchtime is enabled for the current tx_ring before performing the
early return.

Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>
 drivers/net/ethernet/intel/igb/igb_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)


diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index e3a0c02721c9..fa1089defcd5 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -5816,7 +5816,8 @@  static void igb_tx_csum(struct igb_ring *tx_ring, struct igb_tx_buffer *first)
 	if (skb->ip_summed != CHECKSUM_PARTIAL) {
-		if (!(first->tx_flags & IGB_TX_FLAGS_VLAN))
+		if (!(first->tx_flags & IGB_TX_FLAGS_VLAN)
+		    && !tx_ring->launchtime_enable)
 		goto no_csum;