diff options
Diffstat (limited to 'drivers/net/ethernet/sfc/ptp.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/ptp.c | 131 |
1 files changed, 118 insertions, 13 deletions
diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c index 1d1a6f7325d..843e98dfb1b 100644 --- a/drivers/net/ethernet/sfc/ptp.c +++ b/drivers/net/ethernet/sfc/ptp.c @@ -216,6 +216,8 @@ struct efx_ptp_timeset { * struct efx_ptp_data - Precision Time Protocol (PTP) state * @efx: The NIC context * @channel: The PTP channel (Siena only) + * @rx_ts_inline: Flag for whether RX timestamps are inline (else they are + * separate events) * @rxq: Receive queue (awaiting timestamps) * @txq: Transmit queue * @evt_list: List of MC receive events awaiting packets @@ -258,6 +260,7 @@ struct efx_ptp_timeset { struct efx_ptp_data { struct efx_nic *efx; struct efx_channel *channel; + bool rx_ts_inline; struct sk_buff_head rxq; struct sk_buff_head txq; struct list_head evt_list; @@ -317,8 +320,8 @@ static void efx_ptp_ns_to_s_ns(s64 ns, u32 *nic_major, u32 *nic_minor) *nic_minor = ts.tv_nsec; } -static ktime_t efx_ptp_s_ns_to_ktime(u32 nic_major, u32 nic_minor, - s32 correction) +static ktime_t efx_ptp_s_ns_to_ktime_correction(u32 nic_major, u32 nic_minor, + s32 correction) { ktime_t kt = ktime_set(nic_major, nic_minor); if (correction >= 0) @@ -359,11 +362,16 @@ static void efx_ptp_ns_to_s27(s64 ns, u32 *nic_major, u32 *nic_minor) *nic_minor = min; } -static ktime_t efx_ptp_s27_to_ktime(u32 nic_major, u32 nic_minor, - s32 correction) +static inline ktime_t efx_ptp_s27_to_ktime(u32 nic_major, u32 nic_minor) { - u32 ns; + u32 ns = (u32)(((u64)nic_minor * NSEC_PER_SEC + + (1ULL << (S27_TO_NS_SHIFT - 1))) >> S27_TO_NS_SHIFT); + return ktime_set(nic_major, ns); +} +static ktime_t efx_ptp_s27_to_ktime_correction(u32 nic_major, u32 nic_minor, + s32 correction) +{ /* Apply the correction and deal with carry */ nic_minor += correction; if ((s32)nic_minor < 0) { @@ -374,10 +382,7 @@ static ktime_t efx_ptp_s27_to_ktime(u32 nic_major, u32 nic_minor, nic_major++; } - ns = (u32)(((u64)nic_minor * NSEC_PER_SEC + - (1ULL << (S27_TO_NS_SHIFT - 1))) >> S27_TO_NS_SHIFT); - - return ktime_set(nic_major, ns); + return efx_ptp_s27_to_ktime(nic_major, nic_minor); } /* Get PTP attributes and set up time conversions */ @@ -407,10 +412,10 @@ static int efx_ptp_get_attributes(struct efx_nic *efx) if (fmt == MC_CMD_PTP_OUT_GET_ATTRIBUTES_SECONDS_27FRACTION) { ptp->ns_to_nic_time = efx_ptp_ns_to_s27; - ptp->nic_to_kernel_time = efx_ptp_s27_to_ktime; + ptp->nic_to_kernel_time = efx_ptp_s27_to_ktime_correction; } else if (fmt == MC_CMD_PTP_OUT_GET_ATTRIBUTES_SECONDS_NANOSECONDS) { ptp->ns_to_nic_time = efx_ptp_ns_to_s_ns; - ptp->nic_to_kernel_time = efx_ptp_s_ns_to_ktime; + ptp->nic_to_kernel_time = efx_ptp_s_ns_to_ktime_correction; } else { return -ERANGE; } @@ -806,6 +811,9 @@ static void efx_ptp_drop_time_expired_events(struct efx_nic *efx) struct list_head *cursor; struct list_head *next; + if (ptp->rx_ts_inline) + return; + /* Drop time-expired events */ spin_lock_bh(&ptp->evt_lock); if (!list_empty(&ptp->evt_list)) { @@ -839,6 +847,8 @@ static enum ptp_packet_state efx_ptp_match_rx(struct efx_nic *efx, struct efx_ptp_match *match; enum ptp_packet_state rc = PTP_PACKET_STATE_UNMATCHED; + WARN_ON_ONCE(ptp->rx_ts_inline); + spin_lock_bh(&ptp->evt_lock); evts_waiting = !list_empty(&ptp->evt_list); spin_unlock_bh(&ptp->evt_lock); @@ -1061,8 +1071,6 @@ static void efx_ptp_pps_worker(struct work_struct *work) ptp_clock_event(ptp->phc_clock, &ptp_evt); } -/* Process any pending transmissions and timestamp any received packets. - */ static void efx_ptp_worker(struct work_struct *work) { struct efx_ptp_data *ptp_data = @@ -1120,6 +1128,7 @@ int efx_ptp_probe(struct efx_nic *efx, struct efx_channel *channel) ptp->efx = efx; ptp->channel = channel; + ptp->rx_ts_inline = efx_nic_rev(efx) >= EFX_REV_HUNT_A0; rc = efx_nic_alloc_buffer(efx, &ptp->start, sizeof(int), GFP_KERNEL); if (rc != 0) @@ -1491,6 +1500,9 @@ static void ptp_event_rx(struct efx_nic *efx, struct efx_ptp_data *ptp) { struct efx_ptp_event_rx *evt = NULL; + if (WARN_ON_ONCE(ptp->rx_ts_inline)) + return; + if (ptp->evt_frag_idx != 3) { ptp_event_failure(efx, 3); return; @@ -1587,6 +1599,93 @@ void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev) } } +void efx_time_sync_event(struct efx_channel *channel, efx_qword_t *ev) +{ + channel->sync_timestamp_major = MCDI_EVENT_FIELD(*ev, PTP_TIME_MAJOR); + channel->sync_timestamp_minor = + MCDI_EVENT_FIELD(*ev, PTP_TIME_MINOR_26_19) << 19; + /* if sync events have been disabled then we want to silently ignore + * this event, so throw away result. + */ + (void) cmpxchg(&channel->sync_events_state, SYNC_EVENTS_REQUESTED, + SYNC_EVENTS_VALID); +} + +/* make some assumptions about the time representation rather than abstract it, + * since we currently only support one type of inline timestamping and only on + * EF10. + */ +#define MINOR_TICKS_PER_SECOND 0x8000000 +/* Fuzz factor for sync events to be out of order with RX events */ +#define FUZZ (MINOR_TICKS_PER_SECOND / 10) +#define EXPECTED_SYNC_EVENTS_PER_SECOND 4 + +static inline u32 efx_rx_buf_timestamp_minor(struct efx_nic *efx, const u8 *eh) +{ +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) + return __le32_to_cpup((const __le32 *)(eh + efx->rx_packet_ts_offset)); +#else + const u8 *data = eh + efx->rx_packet_ts_offset; + return (u32)data[0] | + (u32)data[1] << 8 | + (u32)data[2] << 16 | + (u32)data[3] << 24; +#endif +} + +void __efx_rx_skb_attach_timestamp(struct efx_channel *channel, + struct sk_buff *skb) +{ + struct efx_nic *efx = channel->efx; + u32 pkt_timestamp_major, pkt_timestamp_minor; + u32 diff, carry; + struct skb_shared_hwtstamps *timestamps; + + pkt_timestamp_minor = (efx_rx_buf_timestamp_minor(efx, + skb_mac_header(skb)) + + (u32) efx->ptp_data->ts_corrections.rx) & + (MINOR_TICKS_PER_SECOND - 1); + + /* get the difference between the packet and sync timestamps, + * modulo one second + */ + diff = (pkt_timestamp_minor - channel->sync_timestamp_minor) & + (MINOR_TICKS_PER_SECOND - 1); + /* do we roll over a second boundary and need to carry the one? */ + carry = channel->sync_timestamp_minor + diff > MINOR_TICKS_PER_SECOND ? + 1 : 0; + + if (diff <= MINOR_TICKS_PER_SECOND / EXPECTED_SYNC_EVENTS_PER_SECOND + + FUZZ) { + /* packet is ahead of the sync event by a quarter of a second or + * less (allowing for fuzz) + */ + pkt_timestamp_major = channel->sync_timestamp_major + carry; + } else if (diff >= MINOR_TICKS_PER_SECOND - FUZZ) { + /* packet is behind the sync event but within the fuzz factor. + * This means the RX packet and sync event crossed as they were + * placed on the event queue, which can sometimes happen. + */ + pkt_timestamp_major = channel->sync_timestamp_major - 1 + carry; + } else { + /* it's outside tolerance in both directions. this might be + * indicative of us missing sync events for some reason, so + * we'll call it an error rather than risk giving a bogus + * timestamp. + */ + netif_vdbg(efx, drv, efx->net_dev, + "packet timestamp %x too far from sync event %x:%x\n", + pkt_timestamp_minor, channel->sync_timestamp_major, + channel->sync_timestamp_minor); + return; + } + + /* attach the timestamps to the skb */ + timestamps = skb_hwtstamps(skb); + timestamps->hwtstamp = + efx_ptp_s27_to_ktime(pkt_timestamp_major, pkt_timestamp_minor); +} + static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta) { struct efx_ptp_data *ptp_data = container_of(ptp, @@ -1728,9 +1827,15 @@ void efx_ptp_start_datapath(struct efx_nic *efx) { if (efx_ptp_restart(efx)) netif_err(efx, drv, efx->net_dev, "Failed to restart PTP.\n"); + /* re-enable timestamping if it was previously enabled */ + if (efx->type->ptp_set_ts_sync_events) + efx->type->ptp_set_ts_sync_events(efx, true, true); } void efx_ptp_stop_datapath(struct efx_nic *efx) { + /* temporarily disable timestamping */ + if (efx->type->ptp_set_ts_sync_events) + efx->type->ptp_set_ts_sync_events(efx, false, true); efx_ptp_stop(efx); } |