diff options
| author | Vladimir Oltean <olteanv@gmail.com> | 2021-03-10 16:50:44 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-03-10 12:45:16 -0800 |
| commit | 847cbfc014adafeac401e19e349b0fd524f201c3 (patch) | |
| tree | 54bd8b80cdc06c39573fd793dc54054163d3d683 /drivers/net/ethernet/intel/igc/igc_main.c | |
| parent | aa27b8f7a048f1cf888b1cb67160e26e069a263c (diff) | |
| download | linux-847cbfc014adafeac401e19e349b0fd524f201c3.tar.gz linux-847cbfc014adafeac401e19e349b0fd524f201c3.tar.bz2 linux-847cbfc014adafeac401e19e349b0fd524f201c3.zip | |
net: add a helper to avoid issues with HW TX timestamping and SO_TXTIME
As explained in commit 29d98f54a4fe ("net: enetc: allow hardware
timestamping on TX queues with tc-etf enabled"), hardware TX
timestamping requires an skb with skb->tstamp = 0. When a packet is sent
with SO_TXTIME, the skb->skb_mstamp_ns corrupts the value of skb->tstamp,
so the drivers need to explicitly reset skb->tstamp to zero after
consuming the TX time.
Create a helper named skb_txtime_consumed() which does just that. All
drivers which offload TC_SETUP_QDISC_ETF should implement it, and it
would make it easier to assess during review whether they do the right
thing in order to be compatible with hardware timestamping or not.
Suggested-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/intel/igc/igc_main.c')
| -rw-r--r-- | drivers/net/ethernet/intel/igc/igc_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index 7ac9597ddb84..059ffcfb0bda 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -941,7 +941,7 @@ static void igc_tx_ctxtdesc(struct igc_ring *tx_ring, struct igc_adapter *adapter = netdev_priv(tx_ring->netdev); ktime_t txtime = first->skb->tstamp; - first->skb->tstamp = ktime_set(0, 0); + skb_txtime_consumed(first->skb); context_desc->launch_time = igc_tx_launchtime(adapter, txtime); } else { |