diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c index 25d96bedf243..5bf772ceb1e0 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c @@ -1386,6 +1386,68 @@ void mlxsw_sp2_ptp_fini(struct mlxsw_sp_ptp_state *ptp_state_common) kfree(ptp_state); } +static u32 mlxsw_ptp_utc_time_stamp_sec_get(struct mlxsw_core *mlxsw_core, + u8 cqe_ts_sec) +{ + u32 utc_sec = mlxsw_core_read_utc_sec(mlxsw_core); + + if (cqe_ts_sec > (utc_sec & 0xff)) + /* Time stamp above the last bits of UTC (UTC & 0xff) means the + * latter has wrapped after the time stamp was collected. + */ + utc_sec -= 256; + + utc_sec &= ~0xff; + utc_sec |= cqe_ts_sec; + + return utc_sec; +} + +static void mlxsw_sp2_ptp_hwtstamp_fill(struct mlxsw_core *mlxsw_core, + const struct mlxsw_skb_cb *cb, + struct skb_shared_hwtstamps *hwtstamps) +{ + u64 ts_sec, ts_nsec, nsec; + + WARN_ON_ONCE(!cb->cqe_ts.sec && !cb->cqe_ts.nsec); + + /* The time stamp in the CQE is represented by 38 bits, which is a short + * representation of UTC time. Software should create the full time + * stamp using the global UTC clock. The seconds have only 8 bits in the + * CQE, to create the full time stamp, use the current UTC time and fix + * the seconds according to the relation between UTC seconds and CQE + * seconds. + */ + ts_sec = mlxsw_ptp_utc_time_stamp_sec_get(mlxsw_core, cb->cqe_ts.sec); + ts_nsec = cb->cqe_ts.nsec; + + nsec = ts_sec * NSEC_PER_SEC + ts_nsec; + + hwtstamps->hwtstamp = ns_to_ktime(nsec); +} + +void mlxsw_sp2_ptp_receive(struct mlxsw_sp *mlxsw_sp, struct sk_buff *skb, + u16 local_port) +{ + struct skb_shared_hwtstamps hwtstamps; + + mlxsw_sp2_ptp_hwtstamp_fill(mlxsw_sp->core, mlxsw_skb_cb(skb), + &hwtstamps); + *skb_hwtstamps(skb) = hwtstamps; + mlxsw_sp_rx_listener_no_mark_func(skb, local_port, mlxsw_sp); +} + +void mlxsw_sp2_ptp_transmitted(struct mlxsw_sp *mlxsw_sp, + struct sk_buff *skb, u16 local_port) +{ + struct skb_shared_hwtstamps hwtstamps; + + mlxsw_sp2_ptp_hwtstamp_fill(mlxsw_sp->core, mlxsw_skb_cb(skb), + &hwtstamps); + skb_tstamp_tx(skb, &hwtstamps); + dev_kfree_skb_any(skb); +} + int mlxsw_sp_ptp_txhdr_construct(struct mlxsw_core *mlxsw_core, struct mlxsw_sp_port *mlxsw_sp_port, struct sk_buff *skb, |