xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

net: add a helper to avoid issues with HW TX timestamping and SO_TXTIME

Browse Source 
[ Upstream commit 847cbfc014adafeac401e19e349b0fd524f201c3 ]

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>
Stable-dep-of: db0b124f02ba ("igc: Enhance Qbv scheduling by using first flag bit")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vladimir Oltean
2021-03-10 16:50:44 +02:00
committed by Greg Kroah-Hartman
parent ae5d96bae3
commit a8f9698a05
4 changed files with 13 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/intel/igb/igb_main.c
View File

@@ -5879,7 +5879,7 @@ static void igb_tx_ctxtdesc(struct igb_ring *tx_ring,
*/
if (tx_ring->launchtime_enable) {
ts = ktime_to_timespec64(first->skb->tstamp);
first->skb->tstamp = ktime_set(0, 0);
skb_txtime_consumed(first->skb);
context_desc->seqnum_seed = cpu_to_le32(ts.tv_nsec / 32);
} else {
context_desc->seqnum_seed = 0;

2
drivers/net/ethernet/intel/igc/igc_main.c
View File

@@ -946,7 +946,7 @@ 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 {