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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>
This commit is contained in:
Jesus Sanchez-Palencia 2018-07-26 10:20:38 -07:00 committed by Jeff Kirsher
parent ee400a3f1b
commit a798fbac33
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/intel/igb/igb_main.c
View File

@ -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;
}