Re: [Linuxptp-devel] [RFC PATCH v2 1/9] Add new TLV for CommonMeanLinkDelayInformation
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Re: [Linuxptp-devel] [RFC PATCH v2 1/9] Add new TLV for CommonMeanLinkDelayInformation
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From: Erez <ere...@gm...> - 2023-05-18 16:47:33
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Thanks for the reply.
Please add the explanation to the commit and to the structure.
Personally, I do not have an opinion, yet I did not participate in the IEEE
1558 committee.
Erez
On Tue, 16 May 2023 at 23:43, Kishen Maloor <kis...@in...> wrote:
> On 5/16/23 3:56 AM, Erez wrote:
> > On Tue, 16 May 2023 at 00:29, Kishen Maloor <kis...@in...>
> wrote:
> >
> >> In a setup with multiple gPTP domains, the Common Mean Link Delay
> Service
> >> (CMLDS) (IEEE 1588/16.6.3) performs link delay measurements in a single
> >> domain and must (somehow) convey those to other domains. IEEE 1588 does
> not
> >> specify this interface and flags it as an implementation
> >> detail (IEEE 1588/16.6.1). Accordningly, this change introduces a new
> >> TLV to convey link delay measurements by the CMLDS over the management
> >> interface.
> >>
> >> In addition to the parameters suggested in IEEE 1588/16.6.3.2,
> >> the TLV also conveys the latest 'up measurements' (req and rx
> timestamps)
> >> recorded in the CMLDS. These values collectively aid other gPTP domains
> to
> >> complete their delay/offset computations via the COMMON_P2P
> >> delay mechanism.
> >>
> >> Updated 'pmc' to support the new MID, MID_CMLDS_INFO_NP.
> >>
> >> Co-authored-by: Andrew Zaborowski <and...@in...>
> >> Signed-off-by: Kishen Maloor <kis...@in...>
> >> ---
> >> clock.c | 1 -
> >> msg.h | 2 ++
> >> pmc.c | 13 +++++++++++++
> >> pmc_common.c | 1 +
> >> port.c | 22 ++++++++++++++++++++++
> >> port_private.h | 2 ++
> >> tlv.c | 18 ++++++++++++++++++
> >> tlv.h | 11 +++++++++++
> >> 8 files changed, 69 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/clock.c b/clock.c
> >> index fe08d48ed8f8..c74a6baa9f61 100644
> >> --- a/clock.c
> >> +++ b/clock.c
> >> @@ -47,7 +47,6 @@
> >> #include "util.h"
> >>
> >> #define N_CLOCK_PFD (N_POLLFD + 1) /* one extra per port, for the fault
> >> timer */
> >> -#define POW2_41 ((double)(1ULL << 41))
> >>
> >> struct interface {
> >> STAILQ_ENTRY(interface) list;
> >> diff --git a/msg.h b/msg.h
> >> index cbd09e75a2aa..db12e249f89f 100644
> >> --- a/msg.h
> >> +++ b/msg.h
> >> @@ -69,6 +69,8 @@
> >> #define SIGNAL_NO_CHANGE -128
> >> #define SIGNAL_SET_INITIAL 126
> >>
> >> +#define POW2_41 ((double)(1ULL << 41))
> >> +
> >> enum timestamp_type {
> >> TS_SOFTWARE,
> >> TS_HARDWARE,
> >> diff --git a/pmc.c b/pmc.c
> >> index 00e691f0c244..cac06fb5b41d 100644
> >> --- a/pmc.c
> >> +++ b/pmc.c
> >> @@ -169,6 +169,7 @@ static void pmc_show(struct ptp_message *msg, FILE
> *fp)
> >> struct subscribe_events_np *sen;
> >> struct port_properties_np *ppn;
> >> struct port_hwclock_np *phn;
> >> + struct cmlds_info_np *cmlds;
> >> struct timePropertiesDS *tp;
> >> struct management_tlv *mgt;
> >> struct time_status_np *tsn;
> >> @@ -651,6 +652,18 @@ static void pmc_show(struct ptp_message *msg, FILE
> >> *fp)
> >> fprintf(fp, "LOG_MIN_PDELAY_REQ_INTERVAL "
> >> IFMT "logMinPdelayReqInterval %hhd", mtd->val);
> >> break;
> >> + case MID_CMLDS_INFO_NP:
> >> + cmlds = (struct cmlds_info_np *) mgt->data;
> >> + fprintf(fp, "CMLDS INFO "
> >> + IFMT "serviceMeasurementValid %i"
> >> + IFMT "meanLinkDelay %" PRId64
> >> + IFMT "scaledNeighborRateRatio %" PRId32
> >> + IFMT "egress_ts %" PRId64
> >> + IFMT "rx_ts %" PRId64,
> >> + cmlds->serviceMeasurementValid,
> >> cmlds->meanLinkDelay,
> >> + cmlds->scaledNeighborRateRatio,
> >> + cmlds->egress_ts, cmlds->rx_ts);
> >> + break;
> >> }
> >> out:
> >> fprintf(fp, "\n");
> >> diff --git a/pmc_common.c b/pmc_common.c
> >> index 9e251c43e95b..d7a6114dcd62 100644
> >> --- a/pmc_common.c
> >> +++ b/pmc_common.c
> >> @@ -156,6 +156,7 @@ struct management_id idtab[] = {
> >> { "UNICAST_MASTER_TABLE_NP", MID_UNICAST_MASTER_TABLE_NP,
> >> do_get_action },
> >> { "PORT_HWCLOCK_NP", MID_PORT_HWCLOCK_NP, do_get_action },
> >> { "POWER_PROFILE_SETTINGS_NP", MID_POWER_PROFILE_SETTINGS_NP,
> >> do_set_action },
> >> + { "CMLDS_INFO_NP", MID_CMLDS_INFO_NP, do_get_action },
> >> };
> >>
> >> static void do_get_action(struct pmc *pmc, int action, int index, char
> >> *str)
> >> diff --git a/port.c b/port.c
> >> index 8b2eb04a855a..d467a69e519a 100644
> >> --- a/port.c
> >> +++ b/port.c
> >> @@ -887,6 +887,7 @@ static int port_management_fill_response(struct port
> >> *target,
> >> struct clock_description *desc;
> >> struct port_properties_np *ppn;
> >> struct port_hwclock_np *phn;
> >> + struct cmlds_info_np *cmlds;
> >> struct management_tlv *tlv;
> >> struct port_stats_np *psn;
> >> struct foreign_clock *fc;
> >> @@ -1129,6 +1130,27 @@ static int port_management_fill_response(struct
> >> port *target,
> >> memcpy(pwr, &target->pwr, sizeof(*pwr));
> >> datalen = sizeof(*pwr);
> >> break;
> >> + case MID_CMLDS_INFO_NP:
> >> + cmlds = (struct cmlds_info_np *)tlv->data;
> >> + /* IEEE1588-2019 16.6.3.2 h) 1) && nrate.ratio_valid
> >> because
> >> + * we have no extra field to convey that separately.
> >> + */
> >> + cmlds->serviceMeasurementValid =
> >> + target->peer_portid_valid &&
> !target->pdr_missing
> >> &&
> >> + !target->multiple_pdr_detected &&
> >> + target->nrate.ratio_valid;
> >> + cmlds->meanLinkDelay = target->peerMeanPathDelay;
> >> + cmlds->scaledNeighborRateRatio =
> >> + (Integer32) (target->nrate.ratio * POW2_41 -
> >> POW2_41);
> >> + /* 16.6.3.2: "Upon receipt of a request for
> information,
> >> the
> >> + * Common Mean Link Delay Service may in addition return
> >> the
> >> + * raw measurement data gathered by the service for use
> in
> >> + * estimating the <meanLinkDelay> and
> <neighborRateRatio>."
> >> + */
> >> + cmlds->egress_ts =
> >> tmv_to_nanoseconds(target->peer_delay_t1);
> >> + cmlds->rx_ts =
> tmv_to_nanoseconds(target->peer_delay_t2);
> >> + datalen = sizeof(*cmlds);
> >> + break;
> >> default:
> >> /* The caller should *not* respond to this message. */
> >> tlv_extra_recycle(extra);
> >> diff --git a/port_private.h b/port_private.h
> >> index 3b02d2fe45c4..c9b02bc799f5 100644
> >> --- a/port_private.h
> >> +++ b/port_private.h
> >> @@ -99,6 +99,8 @@ struct port {
> >> unsigned int pdr_missing;
> >> unsigned int multiple_seq_pdr_count;
> >> unsigned int multiple_pdr_detected;
> >> + tmv_t peer_delay_t1;
> >> + tmv_t peer_delay_t2;
> >> enum port_state (*state_machine)(enum port_state state,
> >> enum fsm_event event, int
> mdiff);
> >> int bmca;
> >> diff --git a/tlv.c b/tlv.c
> >> index 79400126cbc4..8b97d2cfc9f5 100644
> >> --- a/tlv.c
> >> +++ b/tlv.c
> >> @@ -176,6 +176,7 @@ static int mgt_post_recv(struct management_tlv *m,
> >> uint16_t data_len,
> >> struct port_properties_np *ppn;
> >> struct port_hwclock_np *phn;
> >> struct timePropertiesDS *tp;
> >> + struct cmlds_info_np *cmlds;
> >> struct time_status_np *tsn;
> >> struct port_stats_np *psn;
> >> int extra_len = 0, i, len;
> >> @@ -490,6 +491,15 @@ static int mgt_post_recv(struct management_tlv *m,
> >> uint16_t data_len,
> >> if (data_len != 0)
> >> goto bad_length;
> >> break;
> >> + case MID_CMLDS_INFO_NP:
> >> + if (data_len < sizeof(struct cmlds_info_np))
> >> + goto bad_length;
> >> + cmlds = (struct cmlds_info_np *)m->data;
> >> + net2host64_unaligned(&cmlds->meanLinkDelay);
> >> + NTOHL(cmlds->scaledNeighborRateRatio);
> >> + net2host64_unaligned(&cmlds->egress_ts);
> >> + net2host64_unaligned(&cmlds->rx_ts);
> >> + break;
> >> }
> >> if (extra_len) {
> >> if (extra_len % 2)
> >> @@ -514,6 +524,7 @@ static void mgt_pre_send(struct management_tlv *m,
> >> struct tlv_extra *extra)
> >> struct subscribe_events_np *sen;
> >> struct port_properties_np *ppn;
> >> struct port_hwclock_np *phn;
> >> + struct cmlds_info_np *cmlds;
> >> struct timePropertiesDS *tp;
> >> struct time_status_np *tsn;
> >> struct port_stats_np *psn;
> >> @@ -672,6 +683,13 @@ static void mgt_pre_send(struct management_tlv *m,
> >> struct tlv_extra *extra)
> >> HTONL(pwr->networkTimeInaccuracy);
> >> HTONL(pwr->totalTimeInaccuracy);
> >> break;
> >> + case MID_CMLDS_INFO_NP:
> >> + cmlds = (struct cmlds_info_np *)m->data;
> >> + host2net64_unaligned(&cmlds->meanLinkDelay);
> >> + HTONL(cmlds->scaledNeighborRateRatio);
> >> + host2net64_unaligned(&cmlds->egress_ts);
> >> + host2net64_unaligned(&cmlds->rx_ts);
> >> + break;
> >> }
> >> }
> >>
> >> diff --git a/tlv.h b/tlv.h
> >> index 8b51ffd88816..6446fc068488 100644
> >> --- a/tlv.h
> >> +++ b/tlv.h
> >> @@ -130,6 +130,9 @@ enum management_action {
> >> #define MID_PORT_HWCLOCK_NP 0xC009
> >> #define MID_POWER_PROFILE_SETTINGS_NP 0xC00A
> >>
> >> +/* CMLDS management ID values */
> >> +#define MID_CMLDS_INFO_NP 0xC00B
> >> +
> >> /* Management error ID values */
> >> #define MID_RESPONSE_TOO_BIG 0x0001
> >> #define MID_NO_SUCH_ID 0x0002
> >> @@ -473,6 +476,14 @@ struct msg_interface_rate_tlv {
> >> UInteger16 numberOfBitsAfterTimestamp;
> >> } PACKED;
> >>
> >> +struct cmlds_info_np {
> >> + Integer8 serviceMeasurementValid;
> >> + TimeInterval meanLinkDelay;
> >> + Integer32 scaledNeighborRateRatio;
> >
> > + Integer64 egress_ts;
> >> + Integer64 rx_ts;
> >>
> >
> > Not really sure what is better.
> > But why not using Timestamp?, the annoying type from IEEE.
> > Can you please add a remark here with cons and pros and a decision here?
>
> This TLV (and its conveyance method) is unspecified and is set by the
> implementation.
> So as such, we're handing these tmv_t timestamps as is to a requesting
> port, wherefrom
> they're directly passed in a call to clock_peer_delay().
> I guess we didn't think to send these values as struct Timestamp instead
> because it wasn't
> necessary.
>
> >
> >
> >> +} PACKED;
> >> +
> >> /**
> >> * Allocates a new tlv_extra structure.
> >> * @return Pointer to a new structure on success or NULL otherwise.
> >> --
> >> 2.31.1
> >>
> >>
> >>
> >> _______________________________________________
> >> Linuxptp-devel mailing list
> >> Lin...@li...
> >> https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
> >>
> >
>
>
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