Commit a798fbac authored Jul 26, 2018 by Jesus Sanchez-Palencia Committed by Jeff Kirsher Aug 24, 2018

igb: Use an advanced ctx descriptor for launchtime

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

parent ee400a3f

drivers/net/ethernet/intel/igb/igb_main.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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) {
		csum_failed:
		if (!(first->tx_flags & IGB_TX_FLAGS_VLAN))
		if (!(first->tx_flags & IGB_TX_FLAGS_VLAN) &&
		!tx_ring->launchtime_enable)
		return;
		goto no_csum;
		}