From: Vladimir Oltean olteanv@gmail.com
[ 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 --- drivers/net/ethernet/freescale/enetc/enetc.c | 8 ++------ drivers/net/ethernet/intel/igb/igb_main.c | 2 +- drivers/net/ethernet/intel/igc/igc_main.c | 2 +- include/net/pkt_sched.h | 9 +++++++++ 4 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c index 975762ccb66f..5f9603d4c049 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc.c +++ b/drivers/net/ethernet/freescale/enetc/enetc.c @@ -5,6 +5,7 @@ #include <linux/tcp.h> #include <linux/udp.h> #include <linux/vmalloc.h> +#include <net/pkt_sched.h>
/* ENETC overhead: optional extension BD + 1 BD gap */ #define ENETC_TXBDS_NEEDED(val) ((val) + 2) @@ -384,12 +385,7 @@ static void enetc_tstamp_tx(struct sk_buff *skb, u64 tstamp) if (skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS) { memset(&shhwtstamps, 0, sizeof(shhwtstamps)); shhwtstamps.hwtstamp = ns_to_ktime(tstamp); - /* Ensure skb_mstamp_ns, which might have been populated with - * the txtime, is not mistaken for a software timestamp, - * because this will prevent the dispatch of our hardware - * timestamp to the socket. - */ - skb->tstamp = ktime_set(0, 0); + skb_txtime_consumed(skb); skb_tstamp_tx(skb, &shhwtstamps); } } diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index f24f1a8ec2fb..2646601c3487 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -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; diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index f438cdf83e55..48192594d3d7 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -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 { diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h index 7e58b4470570..50d5ffbad473 100644 --- a/include/net/pkt_sched.h +++ b/include/net/pkt_sched.h @@ -179,4 +179,13 @@ struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload *offload); void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
+/* Ensure skb_mstamp_ns, which might have been populated with the txtime, is + * not mistaken for a software timestamp, because this will otherwise prevent + * the dispatch of hardware timestamps to the socket. + */ +static inline void skb_txtime_consumed(struct sk_buff *skb) +{ + skb->tstamp = ktime_set(0, 0); +} + #endif