On Mon, Mar 02, 2026 at 04:05:15PM +0530, MD Danish Anwar via
lists.yoctoproject.org wrote:
> Signed-off-by: MD Danish Anwar <[email protected]>
> ---
> These patches have been posted to upstream linuxptp mailing list.
> https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00013.html
> They are currently under review.
>
> v1 -> v2:
> Added Upstream Status in each patch.
>
> .../linuxptp/linuxptp-arago.inc | 19 +
> ...age-of-non-PTP-packets-during-socket.patch | 81 +++
> ...d-dataset_comparison-type-IEC62439-3.patch | 217 +++++++
> .../0003-Add-PASSIVE_SLAVE-state.patch | 275 +++++++++
> .../0004-rtnl-Add-rtnl_get_hsr_devices.patch | 120 ++++
> .../0005-port-Add-paired_port-option.patch | 175 ++++++
> ...-a-state-engine-for-redundant-master.patch | 519 ++++++++++++++++
> ...ouble-attached-clock-hybrid-clock-HC.patch | 444 ++++++++++++++
> ...orward-packets-both-ways-in-DAC-mode.patch | 37 ++
> ...guard-in-case-PASSIVE_SLAVE-attempts.patch | 37 ++
> ...w-to-forward-packets-in-LISTEN-state.patch | 61 ++
> .../linuxptp/0011-raw-Add-HSR-handling.patch | 567 ++++++++++++++++++
> ...Add-sample-configs-for-the-HSR-setup.patch | 96 +++
> ...2p_dst_mac-to-avoid-IEEE-802.1-reser.patch | 47 ++
> .../linuxptp/linuxptp_%.bbappend | 4 +
> 15 files changed, 2699 insertions(+)
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp-arago.inc
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0001-raw-Prevent-leakage-of-non-PTP-packets-during-socket.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0002-port-Add-dataset_comparison-type-IEC62439-3.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0003-Add-PASSIVE_SLAVE-state.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0004-rtnl-Add-rtnl_get_hsr_devices.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0005-port-Add-paired_port-option.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0006-fsm-Add-a-state-engine-for-redundant-master.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0007-p2p_hc-Add-a-double-attached-clock-hybrid-clock-HC.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0008-tc-Allow-to-forward-packets-both-ways-in-DAC-mode.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0009-port-Add-a-safe-guard-in-case-PASSIVE_SLAVE-attempts.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0010-tc-Allow-to-forward-packets-in-LISTEN-state.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0011-raw-Add-HSR-handling.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0012-configs-Add-sample-configs-for-the-HSR-setup.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0013-configs-Change-p2p_dst_mac-to-avoid-IEEE-802.1-reser.patch
> create mode 100644
> meta-arago-distro/recipes-connectivity/linuxptp/linuxptp_%.bbappend
>
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp-arago.inc
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp-arago.inc
> new file mode 100644
> index 00000000..17819cf3
> --- /dev/null
> +++ b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp-arago.inc
> @@ -0,0 +1,19 @@
> +PR:append = ".arago6"
This is the first submission, why is it .arago6?
> +
> +FILESEXTRAPATHS:prepend := "${THISDIR}/linuxptp:"
> +
> +SRC_URI:append = " \
There's absolutely no reason to suee :append here vs. a simple +=
> + file://0001-raw-Prevent-leakage-of-non-PTP-packets-during-socket.patch \
> + file://0002-port-Add-dataset_comparison-type-IEC62439-3.patch \
> + file://0003-Add-PASSIVE_SLAVE-state.patch \
> + file://0004-rtnl-Add-rtnl_get_hsr_devices.patch \
> + file://0005-port-Add-paired_port-option.patch \
> + file://0006-fsm-Add-a-state-engine-for-redundant-master.patch \
> + file://0007-p2p_hc-Add-a-double-attached-clock-hybrid-clock-HC.patch \
> + file://0008-tc-Allow-to-forward-packets-both-ways-in-DAC-mode.patch \
> + file://0009-port-Add-a-safe-guard-in-case-PASSIVE_SLAVE-attempts.patch \
> + file://0010-tc-Allow-to-forward-packets-in-LISTEN-state.patch \
> + file://0011-raw-Add-HSR-handling.patch \
> + file://0012-configs-Add-sample-configs-for-the-HSR-setup.patch \
> + file://0013-configs-Change-p2p_dst_mac-to-avoid-IEEE-802.1-reser.patch \
> +"
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0001-raw-Prevent-leakage-of-non-PTP-packets-during-socket.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0001-raw-Prevent-leakage-of-non-PTP-packets-during-socket.patch
> new file mode 100644
> index 00000000..ea0f968c
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0001-raw-Prevent-leakage-of-non-PTP-packets-during-socket.patch
> @@ -0,0 +1,81 @@
> +From 5afe386619bfcded393fd5a9ea5d7c9bbcf05823 Mon Sep 17 00:00:00 2001
> +From: Cliff Spradlin <[email protected]>
> +Date: Thu, 2 Oct 2025 18:37:54 -0700
> +Subject: [PATCH 01/13] raw: Prevent leakage of non-PTP packets during socket
> + init
> +
> +There were two problems with the socket configuration sequencing:
> +
> +1) Calling socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)) causes all
> +ethernet frames from -all- interfaces to be queued to the socket,
> +until bind() is later called.
> +
> +2) The BPF filter is installed -after- bind() is called, so ethernet
> +frames that should be rejected could be queued before the BPF filter
> +is installed.
> +
> +This patch reorders the raw socket initialization so that all
> +configuration happens before bind() is called.
> +
> +Signed-off-by: Cliff Spradlin <[email protected]>
> +Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Submitted
> + Submitted to upstream, waiting approval
> + https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00007.html
While there's no specific requirement to have this before the --- line, it
still must be in a single line. Same comment to all patches.
> +
> + raw.c | 22 +++++++++++-----------
> + 1 file changed, 11 insertions(+), 11 deletions(-)
> +
> +diff --git a/raw.c b/raw.c
> +index 94c59ad..c809233 100644
> +--- a/raw.c
> ++++ b/raw.c
> +@@ -241,7 +241,7 @@ static int open_socket(const char *name, int event,
> unsigned char *local_addr,
> + struct sockaddr_ll addr;
> + int fd, index;
> +
> +- fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
> ++ fd = socket(AF_PACKET, SOCK_RAW, 0);
> + if (fd < 0) {
> + pr_err("socket failed: %m");
> + goto no_socket;
> +@@ -250,6 +250,16 @@ static int open_socket(const char *name, int event,
> unsigned char *local_addr,
> + if (index < 0)
> + goto no_option;
> +
> ++ if (socket_priority > 0 &&
> ++ setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &socket_priority,
> ++ sizeof(socket_priority))) {
> ++ pr_err("setsockopt SO_PRIORITY failed: %m");
> ++ goto no_option;
> ++ }
> ++ if (raw_configure(fd, event, index, local_addr, ptp_dst_mac,
> ++ p2p_dst_mac, 1))
> ++ goto no_option;
> ++
> + memset(&addr, 0, sizeof(addr));
> + addr.sll_ifindex = index;
> + addr.sll_family = AF_PACKET;
> +@@ -263,16 +273,6 @@ static int open_socket(const char *name, int event,
> unsigned char *local_addr,
> + goto no_option;
> + }
> +
> +- if (socket_priority > 0 &&
> +- setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &socket_priority,
> +- sizeof(socket_priority))) {
> +- pr_err("setsockopt SO_PRIORITY failed: %m");
> +- goto no_option;
> +- }
> +- if (raw_configure(fd, event, index, local_addr, ptp_dst_mac,
> +- p2p_dst_mac, 1))
> +- goto no_option;
> +-
> + return fd;
> + no_option:
> + close(fd);
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0002-port-Add-dataset_comparison-type-IEC62439-3.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0002-port-Add-dataset_comparison-type-IEC62439-3.patch
> new file mode 100644
> index 00000000..c6405ae0
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0002-port-Add-dataset_comparison-type-IEC62439-3.patch
> @@ -0,0 +1,217 @@
> +From 43a4a63b8c64993ef8662035e86d4805923eb6cc Mon Sep 17 00:00:00 2001
> +From: Sebastian Andrzej Siewior <[email protected]>
> +Date: Thu, 18 Sep 2025 12:58:52 +0200
> +Subject: [PATCH 02/13] port: Add dataset_comparison type IEC62439-3
> +
> +For IEC62439-3 the clock comparison is mostly the same as with IEEE1588.
> +The specification adds an additional comparison step if both messages
> +(from the same master) are identical. The suggestion is to use for
> +instance the port with the smaller value in the correction field but
> +also don't flip between the two ports if port with the smaller
> +correction value changes frequently.
> +
> +Instead pick the first port, and stay with it.
> +Use this dataset_comparison field to:
> +- Make the clock aware that it is in a DAC (doubly attached mode)
> +- Check for two interfaces
> +- Check that the interfaces belong to the same PTP clock domain. Not
> + strictly required but makes it easier. Otherwise the manual
> + synchronisation of the two clocks is required.
> +
> +Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Submitted
> + Submitted to upstream, waiting approval
> + https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00008.html
> +
> + bmc.h | 1 +
> + clock.c | 45 +++++++++++++++++++++++++++++++++++++++++++--
> + clock.h | 7 +++++++
> + config.c | 1 +
> + ptp4l.8 | 4 ++--
> + ptp4l.c | 13 ++++++++++++-
> + 6 files changed, 66 insertions(+), 5 deletions(-)
> +
> +diff --git a/bmc.h b/bmc.h
> +index 413d907..b59a234 100644
> +--- a/bmc.h
> ++++ b/bmc.h
> +@@ -32,6 +32,7 @@
> + enum {
> + DS_CMP_IEEE1588,
> + DS_CMP_G8275,
> ++ DS_CMP_IEC62439_3,
> + };
> +
> + /**
> +diff --git a/clock.c b/clock.c
> +index 17484d8..40c21ec 100644
> +--- a/clock.c
> ++++ b/clock.c
> +@@ -151,6 +151,7 @@ struct clock {
> + struct time_zone tz[MAX_TIME_ZONES];
> + struct ClockIdentity ext_gm_identity;
> + int ext_gm_steps_removed;
> ++ bool use_DAC;
> + };
> +
> + struct clock the_clock;
> +@@ -1389,11 +1390,26 @@ struct clock *clock_create(enum clock_type type,
> struct config *config,
> + }
> + c->servo_state = SERVO_UNLOCKED;
> + c->servo_type = servo;
> +- if (config_get_int(config, NULL, "dataset_comparison") == DS_CMP_G8275)
> {
> ++
> ++ switch (config_get_int(config, NULL, "dataset_comparison")) {
> ++ case DS_CMP_IEEE1588:
> ++ c->dscmp = dscmp;
> ++ break;
> ++
> ++ case DS_CMP_G8275:
> + c->dscmp = telecom_dscmp;
> +- } else {
> ++ break;
> ++
> ++ case DS_CMP_IEC62439_3:
> + c->dscmp = dscmp;
> ++ c->use_DAC = true;
> ++ break;
> ++
> ++ default:
> ++ pr_err("Bad dataset_comparison");
> ++ return NULL;
> + }
> ++
> + c->tsproc = tsproc_create(config_get_int(config, NULL, "tsproc_mode"),
> + config_get_int(config, NULL, "delay_filter"),
> + config_get_int(config, NULL,
> "delay_filter_length"));
> +@@ -1475,6 +1491,26 @@ struct clock *clock_create(enum clock_type type,
> struct config *config,
> + return NULL;
> + }
> +
> ++ if (c->use_DAC) {
> ++ int phc_idx;
> ++
> ++ iface = STAILQ_FIRST(&config->interfaces);
> ++ if (interface_tsinfo_valid(iface)) {
> ++ phc_idx = interface_phc_index(iface);
> ++
> ++ STAILQ_FOREACH(iface, &config->interfaces, list) {
> ++ if (interface_tsinfo_valid(iface)) {
> ++ if (interface_phc_index(iface) !=
> phc_idx) {
> ++ pr_err("The network devices not
> share the PMC\n");
> ++ }
> ++ } else {
> ++ pr_err("Could not verify PHC device of
> the network devices\n");
> ++ }
> ++ }
> ++ } else {
> ++ pr_err("Could not verify PHC device of the network
> devices\n");
> ++ }
> ++ }
> + /* Create the ports. */
> + STAILQ_FOREACH(iface, &config->interfaces, list) {
> + if (clock_add_port(c, phc_device, phc_index, timestamping,
> iface)) {
> +@@ -2359,6 +2395,11 @@ enum clock_type clock_type(struct clock *c)
> + return c->type;
> + }
> +
> ++bool clock_type_is_DAC(struct clock *c)
> ++{
> ++ return c->use_DAC;
> ++}
> ++
> + void clock_check_ts(struct clock *c, uint64_t ts)
> + {
> + if (c->sanity_check && clockcheck_sample(c->sanity_check, ts)) {
> +diff --git a/clock.h b/clock.h
> +index ce9ae91..5d410b3 100644
> +--- a/clock.h
> ++++ b/clock.h
> +@@ -382,6 +382,13 @@ struct clock_description *clock_description(struct
> clock *c);
> + */
> + enum clock_type clock_type(struct clock *c);
> +
> ++/**
> ++ * Check if the clock is doubly attached clock.
> ++ * @param c The clock instance.
> ++ * @return True if the clock is DAC, false otherwise.
> ++ */
> ++bool clock_type_is_DAC(struct clock *c);
> ++
> + /**
> + * Perform a sanity check on a time stamp made by a clock.
> + * @param c The clock instance.
> +diff --git a/config.c b/config.c
> +index 222f4cd..6f4fd9c 100644
> +--- a/config.c
> ++++ b/config.c
> +@@ -176,6 +176,7 @@ static struct config_enum clock_type_enu[] = {
> + static struct config_enum dataset_comp_enu[] = {
> + { "ieee1588", DS_CMP_IEEE1588 },
> + { "G.8275.x", DS_CMP_G8275 },
> ++ { "IEC62439-3", DS_CMP_IEC62439_3},
> + { NULL, 0 },
> + };
> +
> +diff --git a/ptp4l.8 b/ptp4l.8
> +index 6e3f456..dd40731 100644
> +--- a/ptp4l.8
> ++++ b/ptp4l.8
> +@@ -657,8 +657,8 @@ The default is "OC".
> + .TP
> + .B dataset_comparison
> + Specifies the method to be used when comparing data sets during the
> +-Best Master Clock Algorithm. The possible values are "ieee1588" and
> +-"G.8275.x". The default is "ieee1588".
> ++Best Master Clock Algorithm. The possible values are "ieee1588",
> ++"G.8275.x" and "IEC62439-3". The default is "ieee1588".
> +
> + .TP
> + .B domainNumber
> +diff --git a/ptp4l.c b/ptp4l.c
> +index ac2ef96..10b8962 100644
> +--- a/ptp4l.c
> ++++ b/ptp4l.c
> +@@ -23,6 +23,7 @@
> + #include <string.h>
> + #include <unistd.h>
> +
> ++#include "bmc.h"
> + #include "clock.h"
> + #include "config.h"
> + #include "ntpshm.h"
> +@@ -75,6 +76,7 @@ int main(int argc, char *argv[])
> + enum clock_type type = CLOCK_TYPE_ORDINARY;
> + int c, err = -1, index, cmd_line_print_level;
> + struct clock *clock = NULL;
> ++ bool use_DAC = false;
> + struct option *opts;
> + struct config *cfg;
> +
> +@@ -211,10 +213,19 @@ int main(int argc, char *argv[])
> + goto out;
> + }
> +
> ++ if (config_get_int(cfg, NULL, "dataset_comparison") ==
> DS_CMP_IEC62439_3) {
> ++ use_DAC = true;
> ++ }
> ++
> + type = config_get_int(cfg, NULL, "clock_type");
> + switch (type) {
> + case CLOCK_TYPE_ORDINARY:
> +- if (cfg->n_interfaces > 1) {
> ++ if (use_DAC) {
> ++ if (cfg->n_interfaces != 2) {
> ++ fprintf(stderr, "IEC62439-3 dataset comparison
> requires two interfaces\n");
> ++ goto out;
> ++ }
> ++ } else if (cfg->n_interfaces > 1) {
> + type = CLOCK_TYPE_BOUNDARY;
> + }
> + break;
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0003-Add-PASSIVE_SLAVE-state.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0003-Add-PASSIVE_SLAVE-state.patch
> new file mode 100644
> index 00000000..c65d7471
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0003-Add-PASSIVE_SLAVE-state.patch
> @@ -0,0 +1,275 @@
> +From b79ffcdde80fe7f464b00a2fd20f6c587ab6e4ab Mon Sep 17 00:00:00 2001
> +From: Sebastian Andrzej Siewior <[email protected]>
> +Date: Thu, 2 Oct 2025 10:09:32 +0200
> +Subject: [PATCH 03/13] Add PASSIVE_SLAVE state.
> +
> +Add PASSIVE_SLAVE which is defined in IEC 62439-3 as an extension to IEC
> +61588. It also renames PASSIVE to PASSIVE_MASTER for clarity but lets
> +ignore this part.
> +
> +The PASSIVE_SLAVE acts as SLAVE but does not participate in clock
> +adjustments. It will send Delay_Req or Pdelay_Req and respond to those
> +packets.
> +In management interface the PASSIVE_SLAVE should be exposed as SLAVE.
> +
> +Add PS_PASSIVE_SLAVE to port_state and EV_RS_PSLAVE to fsm_event. Update
> +existing state engines to avoid "unhandled switch case".
> +
> +Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Submitted
> + Submitted to upstream, waiting approval
> + https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00009.html
> +
> + clock.c | 3 +++
> + e2e_tc.c | 2 ++
> + fsm.c | 3 +++
> + fsm.h | 2 ++
> + p2p_tc.c | 4 ++++
> + port.c | 14 ++++++++++++--
> + port_signaling.c | 1 +
> + tc.c | 2 ++
> + unicast_service.c | 1 +
> + util.c | 2 ++
> + 10 files changed, 32 insertions(+), 2 deletions(-)
> +
> +diff --git a/clock.c b/clock.c
> +index 40c21ec..d777378 100644
> +--- a/clock.c
> ++++ b/clock.c
> +@@ -2373,6 +2373,9 @@ static void handle_state_decision_event(struct clock
> *c)
> + clock_update_slave(c);
> + event = EV_RS_SLAVE;
> + break;
> ++ case PS_PASSIVE_SLAVE:
> ++ event = EV_RS_PSLAVE;
> ++ break;
> + default:
> + event = EV_FAULT_DETECTED;
> + break;
> +diff --git a/e2e_tc.c b/e2e_tc.c
> +index 82b454a..53cf4eb 100644
> +--- a/e2e_tc.c
> ++++ b/e2e_tc.c
> +@@ -75,6 +75,8 @@ void e2e_dispatch(struct port *p, enum fsm_event event,
> int mdiff)
> + case PS_SLAVE:
> + port_set_announce_tmo(p);
> + break;
> ++ case PS_PASSIVE_SLAVE:
> ++ break;
> + };
> + }
> +
> +diff --git a/fsm.c b/fsm.c
> +index ce6efad..9e8c4d8 100644
> +--- a/fsm.c
> ++++ b/fsm.c
> +@@ -214,6 +214,9 @@ enum port_state ptp_fsm(enum port_state state, enum
> fsm_event event, int mdiff)
> + break;
> + }
> + break;
> ++
> ++ case PS_PASSIVE_SLAVE:
> ++ break;
> + }
> +
> + return next;
> +diff --git a/fsm.h b/fsm.h
> +index 857af05..e07d9a9 100644
> +--- a/fsm.h
> ++++ b/fsm.h
> +@@ -31,6 +31,7 @@ enum port_state {
> + PS_PASSIVE,
> + PS_UNCALIBRATED,
> + PS_SLAVE,
> ++ PS_PASSIVE_SLAVE, /* Added to IEC 61588:2021, Table 27 (via 62439-3) */
> + PS_GRAND_MASTER, /*non-standard extension*/
> + };
> +
> +@@ -53,6 +54,7 @@ enum fsm_event {
> + EV_RS_GRAND_MASTER,
> + EV_RS_SLAVE,
> + EV_RS_PASSIVE,
> ++ EV_RS_PSLAVE,
> + };
> +
> + enum bmca_select {
> +diff --git a/p2p_tc.c b/p2p_tc.c
> +index a8ec63b..7fda10e 100644
> +--- a/p2p_tc.c
> ++++ b/p2p_tc.c
> +@@ -40,6 +40,8 @@ static int p2p_delay_request(struct port *p)
> + case PS_SLAVE:
> + case PS_GRAND_MASTER:
> + break;
> ++ case PS_PASSIVE_SLAVE:
> ++ break;
> + }
> + return port_delay_request(p);
> + }
> +@@ -92,6 +94,8 @@ void p2p_dispatch(struct port *p, enum fsm_event event,
> int mdiff)
> + case PS_SLAVE:
> + port_set_announce_tmo(p);
> + break;
> ++ case PS_PASSIVE_SLAVE:
> ++ break;
> + };
> + }
> +
> +diff --git a/port.c b/port.c
> +index a1d0f2c..549d72b 100644
> +--- a/port.c
> ++++ b/port.c
> +@@ -1023,6 +1023,8 @@ static int port_management_fill_response(struct port
> *target,
> + pds->portIdentity = target->portIdentity;
> + if (target->state == PS_GRAND_MASTER) {
> + pds->portState = PS_MASTER;
> ++ } else if (target->state == PS_PASSIVE_SLAVE) {
> ++ pds->portState = PS_SLAVE;
> + } else {
> + pds->portState = target->state;
> + }
> +@@ -1089,6 +1091,8 @@ static int port_management_fill_response(struct port
> *target,
> + ppn->portIdentity = target->portIdentity;
> + if (target->state == PS_GRAND_MASTER)
> + ppn->port_state = PS_MASTER;
> ++ else if (target->state == PS_PASSIVE_SLAVE)
> ++ ppn->port_state = PS_SLAVE;
> + else
> + ppn->port_state = target->state;
> + ppn->timestamping = target->timestamping;
> +@@ -1922,6 +1926,7 @@ int port_is_enabled(struct port *p)
> + case PS_PASSIVE:
> + case PS_UNCALIBRATED:
> + case PS_SLAVE:
> ++ case PS_PASSIVE_SLAVE:
> + break;
> + }
> + return 1;
> +@@ -2242,6 +2247,7 @@ int process_announce(struct port *p, struct
> ptp_message *m)
> + case PS_PASSIVE:
> + case PS_UNCALIBRATED:
> + case PS_SLAVE:
> ++ case PS_PASSIVE_SLAVE:
> + result = update_current_master(p, m);
> + break;
> + }
> +@@ -2289,7 +2295,7 @@ static int process_cmlds(struct port *p)
> + p->nrate.ratio = 1.0 + (double) cmlds->scaledNeighborRateRatio
> / POW2_41;
> + p->asCapable = cmlds->as_capable;
> + p->cmlds.timer_count = 0;
> +- if (p->state == PS_UNCALIBRATED || p->state == PS_SLAVE) {
> ++ if (p->state == PS_UNCALIBRATED || p->state == PS_SLAVE ||
> p->state == PS_PASSIVE_SLAVE) {
> + const tmv_t tx = tmv_zero();
> + clock_peer_delay(p->clock, p->peer_delay, tx, tx,
> p->nrate.ratio);
> + }
> +@@ -2437,6 +2443,7 @@ void process_follow_up(struct port *p, struct
> ptp_message *m)
> + case PS_MASTER:
> + case PS_GRAND_MASTER:
> + case PS_PASSIVE:
> ++ case PS_PASSIVE_SLAVE:
> + return;
> + case PS_UNCALIBRATED:
> + case PS_SLAVE:
> +@@ -2668,7 +2675,7 @@ calc:
> +
> + p->peerMeanPathDelay = tmv_to_TimeInterval(p->peer_delay);
> +
> +- if (p->state == PS_UNCALIBRATED || p->state == PS_SLAVE) {
> ++ if (p->state == PS_UNCALIBRATED || p->state == PS_SLAVE || p->state ==
> PS_PASSIVE_SLAVE) {
> + clock_peer_delay(p->clock, p->peer_delay, t1, t2,
> + p->nrate.ratio);
> + }
> +@@ -2752,6 +2759,7 @@ void process_sync(struct port *p, struct ptp_message
> *m)
> + case PS_MASTER:
> + case PS_GRAND_MASTER:
> + case PS_PASSIVE:
> ++ case PS_PASSIVE_SLAVE:
> + return;
> + case PS_UNCALIBRATED:
> + case PS_SLAVE:
> +@@ -2895,6 +2903,7 @@ static void port_e2e_transition(struct port *p, enum
> port_state next)
> + sad_set_last_seqid(clock_config(p->clock), p->spp, -1);
> + /* fall through */
> + case PS_SLAVE:
> ++ case PS_PASSIVE_SLAVE:
> + port_set_announce_tmo(p);
> + port_set_delay_tmo(p);
> + break;
> +@@ -2943,6 +2952,7 @@ static void port_p2p_transition(struct port *p, enum
> port_state next)
> + sad_set_last_seqid(clock_config(p->clock), p->spp, -1);
> + /* fall through */
> + case PS_SLAVE:
> ++ case PS_PASSIVE_SLAVE:
> + port_set_announce_tmo(p);
> + break;
> + };
> +diff --git a/port_signaling.c b/port_signaling.c
> +index cf28756..fb42fe6 100644
> +--- a/port_signaling.c
> ++++ b/port_signaling.c
> +@@ -147,6 +147,7 @@ int process_signaling(struct port *p, struct ptp_message
> *m)
> + case PS_PASSIVE:
> + case PS_UNCALIBRATED:
> + case PS_SLAVE:
> ++ case PS_PASSIVE_SLAVE:
> + break;
> + }
> +
> +diff --git a/tc.c b/tc.c
> +index 27ba66f..0fd1bc4 100644
> +--- a/tc.c
> ++++ b/tc.c
> +@@ -88,6 +88,7 @@ static int tc_blocked(struct port *q, struct port *p,
> struct ptp_message *m)
> + break;
> + case PS_UNCALIBRATED:
> + case PS_SLAVE:
> ++ case PS_PASSIVE_SLAVE:
> + break;
> + }
> + /* Egress state */
> +@@ -102,6 +103,7 @@ static int tc_blocked(struct port *q, struct port *p,
> struct ptp_message *m)
> + return 1;
> + case PS_UNCALIBRATED:
> + case PS_SLAVE:
> ++ case PS_PASSIVE_SLAVE:
> + /* Delay_Req swims against the stream. */
> + if (msg_type(m) != DELAY_REQ) {
> + return 1;
> +diff --git a/unicast_service.c b/unicast_service.c
> +index d7a4ecd..7b5196b 100644
> +--- a/unicast_service.c
> ++++ b/unicast_service.c
> +@@ -532,6 +532,7 @@ int unicast_service_timer(struct port *p)
> + case PS_PASSIVE:
> + case PS_UNCALIBRATED:
> + case PS_SLAVE:
> ++ case PS_PASSIVE_SLAVE:
> + break;
> + case PS_MASTER:
> + case PS_GRAND_MASTER:
> +diff --git a/util.c b/util.c
> +index 4e9263b..4deebe8 100644
> +--- a/util.c
> ++++ b/util.c
> +@@ -60,6 +60,7 @@ const char *ps_str[] = {
> + "PASSIVE",
> + "UNCALIBRATED",
> + "SLAVE",
> ++ "PASSIVE_SLAVE",
> + "GRAND_MASTER",
> + };
> +
> +@@ -81,6 +82,7 @@ const char *ev_str[] = {
> + "RS_GRAND_MASTER",
> + "RS_SLAVE",
> + "RS_PASSIVE",
> ++ "RS_PASSIVE_SLAVE",
> + };
> +
> + const char *ts_str(enum timestamp_type ts)
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0004-rtnl-Add-rtnl_get_hsr_devices.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0004-rtnl-Add-rtnl_get_hsr_devices.patch
> new file mode 100644
> index 00000000..2b238acc
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0004-rtnl-Add-rtnl_get_hsr_devices.patch
> @@ -0,0 +1,120 @@
> +From 0dc4e53ae6fb958c5d04108d8511e25cbf3aabfb Mon Sep 17 00:00:00 2001
> +From: Sebastian Andrzej Siewior <[email protected]>
> +Date: Wed, 22 Oct 2025 15:32:22 +0200
> +Subject: [PATCH 04/13] rtnl: Add rtnl_get_hsr_devices()
> +
> +Extend rtnl_linkinfo_parse() by supporting HSR. It will return the
> +two interface numbers in one 32bit int by using the lower 16bit for
> +slave1 and the upper 16bit for slave2.
> +
> +Provide rtnl_get_hsr_devices() which uses it and returns the resolved
> +interface name.
> +
> +Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Submitted
> + Submitted to upstream, waiting approval
> + https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00014.html
> +
> + rtnl.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
> + rtnl.h | 9 +++++++++
> + 2 files changed, 60 insertions(+)
> +
> +diff --git a/rtnl.c b/rtnl.c
> +index 1037c44..2e377ae 100644
> +--- a/rtnl.c
> ++++ b/rtnl.c
> +@@ -207,6 +207,7 @@ static int rtnl_linkinfo_parse(int master_index, struct
> rtattr *rta)
> + {
> + struct rtattr *linkinfo[IFLA_INFO_MAX+1];
> + struct rtattr *bond[IFLA_BOND_MAX+1];
> ++ struct rtattr *hsr[IFLA_HSR_MAX+1];
> + int index = -1;
> + char *kind;
> +
> +@@ -227,6 +228,24 @@ static int rtnl_linkinfo_parse(int master_index, struct
> rtattr *rta)
> + }
> + } else if (kind && !strncmp(kind, "team", 4)) {
> + index = get_team_active_iface(master_index);
> ++
> ++ } else if (kind && !strncmp(kind, "hsr", 3) &&
> ++ linkinfo[IFLA_INFO_DATA]) {
> ++ unsigned int slave1, slave2;
> ++
> ++ if (rtnl_nested_rtattr_parse(hsr, IFLA_HSR_MAX,
> ++ linkinfo[IFLA_INFO_DATA])
> < 0)
> ++ return -1;
> ++
> ++ if (!hsr[IFLA_HSR_SLAVE1] || !hsr[IFLA_HSR_SLAVE2])
> ++ return -1;
> ++
> ++ slave1 = rta_getattr_u32(hsr[IFLA_HSR_SLAVE1]);
> ++ slave2 = rta_getattr_u32(hsr[IFLA_HSR_SLAVE2]);
> ++
> ++ if (slave1 > 0xffff || slave2 > 0xffff)
> ++ return -1;
> ++ index = slave1 | slave2 << 16;
> + }
> + }
> + return index;
> +@@ -552,3 +571,35 @@ no_info:
> + nl_close(fd);
> + return ret;
> + }
> ++
> ++int rtnl_get_hsr_devices(const char *hsr_device, char slaveA[IF_NAMESIZE],
> char slaveB[IF_NAMESIZE])
> ++{
> ++ int err, fd;
> ++ unsigned int hsr_slaves = 0;
> ++
> ++ fd = rtnl_open();
> ++ if (fd < 0)
> ++ return fd;
> ++
> ++ err = rtnl_link_query(fd, hsr_device);
> ++ if (err) {
> ++ goto no_info;
> ++ }
> ++ err = -1;
> ++
> ++ rtnl_link_status(fd, hsr_device, rtnl_get_ts_device_callback,
> &hsr_slaves);
> ++ if (hsr_slaves == 0)
> ++ goto no_info;
> ++
> ++ if (!if_indextoname(hsr_slaves & 0xffff, slaveA))
> ++ goto no_info;
> ++
> ++ if (!if_indextoname(hsr_slaves >> 16, slaveB))
> ++ goto no_info;
> ++
> ++ err = 0;
> ++
> ++no_info:
> ++ rtnl_close(fd);
> ++ return err;
> ++}
> +diff --git a/rtnl.h b/rtnl.h
> +index 96fee29..d10db32 100644
> +--- a/rtnl.h
> ++++ b/rtnl.h
> +@@ -68,6 +68,15 @@ int rtnl_link_status(int fd, const char *device,
> rtnl_callback cb, void *ctx);
> + */
> + int rtnl_iface_has_vclock(const char *device, int phc_index);
> +
> ++/**
> ++ * Return both slave portts of a HSR device.
> ++ * param device The name of the HSR deviec
> ++ * @param slaveA The name of the SlaveA device
> ++ * @param slaveB The name of the SlaveB device
> ++ * @return Zero on success, non-zero otherwise.
> ++ */
> ++int rtnl_get_hsr_devices(const char *hsr_device, char slaveA[IF_NAMESIZE],
> char slaveB[IF_NAMESIZE]);
> ++
> + /**
> + * Open a RT netlink socket for monitoring link state.
> + * @return A valid socket, or -1 on error.
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0005-port-Add-paired_port-option.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0005-port-Add-paired_port-option.patch
> new file mode 100644
> index 00000000..22265db7
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0005-port-Add-paired_port-option.patch
> @@ -0,0 +1,175 @@
> +From 6817d7ab3549a59d55fe6de888e2ee7e72c6c8c9 Mon Sep 17 00:00:00 2001
> +From: Sebastian Andrzej Siewior <[email protected]>
> +Date: Thu, 2 Oct 2025 10:34:10 +0200
> +Subject: [PATCH 05/13] port: Add paired_port option.
> +
> +Add an option to pair ports. This is for a HSR network to find the other
> +port.
> +
> +Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Submitted
> + Submitted to upstream, waiting approval
> + https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00010.html
> +
> + clock.c | 1 +
> + config.c | 1 +
> + makefile | 2 +-
> + port.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
> + port.h | 15 +++++++++++++++
> + port_private.h | 1 +
> + ptp4l.8 | 4 ++++
> + 7 files changed, 71 insertions(+), 1 deletion(-)
> +
> +diff --git a/clock.c b/clock.c
> +index d777378..b628c34 100644
> +--- a/clock.c
> ++++ b/clock.c
> +@@ -1051,6 +1051,7 @@ static int clock_add_port(struct clock *c, const char
> *phc_device,
> + return -1;
> + }
> + LIST_FOREACH(piter, &c->ports, list) {
> ++ port_pair_redundant_ports(p, piter);
> + lastp = piter;
> + }
> + if (lastp) {
> +diff --git a/config.c b/config.c
> +index 6f4fd9c..a882bc7 100644
> +--- a/config.c
> ++++ b/config.c
> +@@ -293,6 +293,7 @@ struct config_item config_tab[] = {
> + GLOB_ITEM_INT("G.8275.defaultDS.localPriority", 128, 1, UINT8_MAX),
> + PORT_ITEM_INT("G.8275.portDS.localPriority", 128, 1, UINT8_MAX),
> + GLOB_ITEM_INT("gmCapable", 1, 0, 1),
> ++ PORT_ITEM_STR("hsr_device", ""),
> + GLOB_ITEM_ENU("hwts_filter", HWTS_FILTER_NORMAL, hwts_filter_enu),
> + PORT_ITEM_INT("hybrid_e2e", 0, 0, 1),
> + PORT_ITEM_INT("ignore_source_id", 0, 0, 1),
> +diff --git a/makefile b/makefile
> +index 07199aa..50c2d5a 100644
> +--- a/makefile
> ++++ b/makefile
> +@@ -26,7 +26,7 @@ PRG = ptp4l hwstamp_ctl nsm phc2sys phc_ctl pmc
> timemaster ts2phc tz2alt
> + SECURITY = sad.o
> + FILTERS = filter.o mave.o mmedian.o
> + SERVOS = linreg.o ntpshm.o nullf.o pi.o refclock_sock.o servo.o
> +-TRANSP = raw.o transport.o udp.o udp6.o uds.o
> ++TRANSP = raw.o transport.o udp.o udp6.o uds.o rtnl.o
> + TS2PHC = ts2phc.o lstab.o nmea.o serial.o sock.o
> ts2phc_generic_pps_source.o \
> + ts2phc_nmea_pps_source.o ts2phc_phc_pps_source.o ts2phc_pps_sink.o
> ts2phc_pps_source.o
> + OBJ = bmc.o clock.o clockadj.o clockcheck.o config.o designated_fsm.o \
> +diff --git a/port.c b/port.c
> +index 549d72b..586e365 100644
> +--- a/port.c
> ++++ b/port.c
> +@@ -3793,6 +3793,54 @@ err_port:
> + return NULL;
> + }
> +
> ++void port_pair_redundant_ports(struct port *p1, struct port *p2)
> ++{
> ++ const char *p1_name = interface_name(p1->iface);
> ++ const char *p2_name = interface_name(p2->iface);
> ++ const char *p1_hsr, *p2_hsr;
> ++ struct config *cfg;
> ++ char hsr_slave_A[IF_NAMESIZE];
> ++ char hsr_slave_B[IF_NAMESIZE];
> ++ int ret;
> ++
> ++ cfg = clock_config(p1->clock);
> ++
> ++ /* Do the two ports belong to the same hsr device? */
> ++ p1_hsr = config_get_string(cfg, p1_name, "hsr_device");
> ++ if (!strlen(p1_hsr))
> ++ return;
> ++
> ++ p2_hsr = config_get_string(cfg, p2_name, "hsr_device");
> ++ if (strcmp(p1_hsr, p2_hsr))
> ++ return;
> ++
> ++ ret = rtnl_get_hsr_devices(p1_hsr, hsr_slave_A, hsr_slave_B);
> ++ if (ret) {
> ++ pr_err("Failed to query HSR attributes on %s", p1_hsr);
> ++ return;
> ++ }
> ++
> ++ if (!strcmp(hsr_slave_A, p1_name) && !strcmp(hsr_slave_B, p2_name)) {
> ++ p1->paired_port = p2;
> ++ p2->paired_port = p1;
> ++ } else if (!strcmp(hsr_slave_A, p2_name) && !strcmp(hsr_slave_B,
> p1_name)) {
> ++ p1->paired_port = p2;
> ++ p2->paired_port = p1;
> ++ } else {
> ++ pr_err("On HSR dev %s ports %s/%s don't match %s/%s\n",
> ++ p1_hsr, hsr_slave_A, hsr_slave_B, p1_name, p2_name);
> ++ return;
> ++ }
> ++
> ++ pr_notice("Pairing redundant ports %s and %s on %s.",
> ++ p1_name, p2_name, p1_hsr);
> ++}
> ++
> ++struct port *port_paired_port(struct port *port)
> ++{
> ++ return port->paired_port;
> ++}
> ++
> + enum port_state port_state(struct port *port)
> + {
> + return port->state;
> +diff --git a/port.h b/port.h
> +index cc03859..f103006 100644
> +--- a/port.h
> ++++ b/port.h
> +@@ -366,4 +366,19 @@ void tc_cleanup(void);
> + */
> + void port_update_unicast_state(struct port *p);
> +
> ++/**
> ++ * Pair two ports which are redundant (as per HSR)
> ++ *
> ++ * @param p1 A port instance.
> ++ * @param p2 A port instance.
> ++ */
> ++void port_pair_redundant_ports(struct port *p1, struct port *p2);
> ++
> ++/**
> ++ * Return the paired (rundant port) of this port instance (as per HSR)
> ++ *
> ++ * @param port A port instance.
> ++ */
> ++struct port *port_paired_port(struct port *port);
> ++
> + #endif
> +diff --git a/port_private.h b/port_private.h
> +index aa9a095..79b1d31 100644
> +--- a/port_private.h
> ++++ b/port_private.h
> +@@ -174,6 +174,7 @@ struct port {
> + int port;
> + } cmlds;
> + struct ProfileIdentity profileIdentity;
> ++ struct port *paired_port;
> + };
> +
> + #define portnum(p) (p->portIdentity.portNumber)
> +diff --git a/ptp4l.8 b/ptp4l.8
> +index dd40731..c8c00ef 100644
> +--- a/ptp4l.8
> ++++ b/ptp4l.8
> +@@ -754,6 +754,10 @@ The server sends its interface rate using interface
> rate TLV
> + as per G.8275.2 Annex D.
> + The default is 0 (does not support interface rate tlv).
> +
> ++.TP
> ++.B hsr_device
> ++If the device belongs to the hsr network, specifiy the HSR parent. Default
> is empty.
> ++
> + .TP
> + .B hwts_filter
> + Select the hardware time stamp filter setting mode.
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0006-fsm-Add-a-state-engine-for-redundant-master.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0006-fsm-Add-a-state-engine-for-redundant-master.patch
> new file mode 100644
> index 00000000..dd94c963
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0006-fsm-Add-a-state-engine-for-redundant-master.patch
> @@ -0,0 +1,519 @@
> +From 52baa3911eb6e7a103b6de6f4c2adf964ab4fca3 Mon Sep 17 00:00:00 2001
> +From: Sebastian Andrzej Siewior <[email protected]>
> +Date: Thu, 2 Oct 2025 10:37:06 +0200
> +Subject: [PATCH 06/13] fsm: Add a state engine for redundant master
> +
> +The FSM ptp_red_m_fsm() and ptp_red_slave_fsm() (slave only) are based
> +on ptp_fsm() and ptp_slave_fsm() but add the additional PASSIVE_SLAVE
> +handling.
> +This state machine is selected once redundant_master has been specified
> +for the bmca option.
> +
> +The bmc_state_decision() will return PASSIVE_SLAVE if a redundant port
> +is available and has the best clock.
> +
> +Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Submitted
> + Submitted to upstream, waiting approval
> + https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00016.html
> +
> + bmc.c | 6 +
> + config.c | 1 +
> + fsm.c | 395 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> + fsm.h | 19 +++
> + port.c | 2 +
> + 5 files changed, 423 insertions(+)
> +
> +diff --git a/bmc.c b/bmc.c
> +index ebc0789..5ce0b0c 100644
> +--- a/bmc.c
> ++++ b/bmc.c
> +@@ -130,6 +130,7 @@ enum port_state bmc_state_decision(struct clock *c,
> struct port *r,
> + int (*compare)(struct dataset *a, struct
> dataset *b))
> + {
> + struct dataset *clock_ds, *clock_best, *port_best;
> ++ struct port *paired_port;
> + enum port_state ps;
> +
> + clock_ds = clock_default_ds(c);
> +@@ -167,6 +168,11 @@ enum port_state bmc_state_decision(struct clock *c,
> struct port *r,
> + return PS_SLAVE; /*S1*/
> + }
> +
> ++ paired_port = port_paired_port(r);
> ++ if (paired_port && clock_best_port(c) == paired_port) {
> ++ return PS_PASSIVE_SLAVE;
> ++ }
> ++
> + if (compare(clock_best, port_best) == A_BETTER_TOPO) {
> + return PS_PASSIVE; /*P2*/
> + } else {
> +diff --git a/config.c b/config.c
> +index a882bc7..4cdb37f 100644
> +--- a/config.c
> ++++ b/config.c
> +@@ -249,6 +249,7 @@ static struct config_enum as_capable_enu[] = {
> + static struct config_enum bmca_enu[] = {
> + { "ptp", BMCA_PTP },
> + { "noop", BMCA_NOOP },
> ++ { "redundant_master", BMCA_RED_MASTER },
> + { NULL, 0 },
> + };
> +
> +diff --git a/fsm.c b/fsm.c
> +index 9e8c4d8..af72fea 100644
> +--- a/fsm.c
> ++++ b/fsm.c
> +@@ -338,3 +338,398 @@ enum port_state ptp_slave_fsm(enum port_state state,
> enum fsm_event event,
> +
> + return next;
> + }
> ++
> ++enum port_state ptp_red_m_fsm(enum port_state state, enum fsm_event event,
> int mdiff)
> ++{
> ++ enum port_state next = state;
> ++
> ++ if (EV_INITIALIZE == event || EV_POWERUP == event)
> ++ return PS_INITIALIZING;
> ++
> ++ switch (state) {
> ++ case PS_INITIALIZING:
> ++ switch (event) {
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_INIT_COMPLETE:
> ++ next = PS_LISTENING;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_FAULTY:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_CLEARED:
> ++ next = PS_INITIALIZING;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_DISABLED:
> ++ if (EV_DESIGNATED_ENABLED == event)
> ++ next = PS_INITIALIZING;
> ++ break;
> ++
> ++ case PS_LISTENING:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES:
> ++ next = PS_MASTER;
> ++ break;
> ++ case EV_RS_MASTER:
> ++ next = PS_PRE_MASTER;
> ++ break;
> ++ case EV_RS_GRAND_MASTER:
> ++ next = PS_GRAND_MASTER;
> ++ break;
> ++ case EV_RS_SLAVE:
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ case EV_RS_PASSIVE:
> ++ next = PS_PASSIVE;
> ++ break;
> ++ case EV_RS_PSLAVE:
> ++ next = PS_PASSIVE_SLAVE;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_PRE_MASTER:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_QUALIFICATION_TIMEOUT_EXPIRES:
> ++ next = PS_MASTER;
> ++ break;
> ++ case EV_RS_SLAVE:
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ case EV_RS_PASSIVE:
> ++ next = PS_PASSIVE;
> ++ break;
> ++ case EV_RS_PSLAVE:
> ++ next = PS_PASSIVE_SLAVE;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_MASTER:
> ++ case PS_GRAND_MASTER:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_RS_SLAVE:
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ case EV_RS_PASSIVE:
> ++ next = PS_PASSIVE;
> ++ break;
> ++ case EV_RS_PSLAVE:
> ++ next = PS_PASSIVE_SLAVE;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_PASSIVE:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES:
> ++ next = PS_MASTER;
> ++ break;
> ++ case EV_RS_MASTER:
> ++ next = PS_PRE_MASTER;
> ++ break;
> ++ case EV_RS_GRAND_MASTER:
> ++ next = PS_GRAND_MASTER;
> ++ break;
> ++ case EV_RS_SLAVE:
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_UNCALIBRATED:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES:
> ++ next = PS_MASTER;
> ++ break;
> ++ case EV_MASTER_CLOCK_SELECTED:
> ++ next = PS_SLAVE;
> ++ break;
> ++ case EV_RS_MASTER:
> ++ next = PS_PRE_MASTER;
> ++ break;
> ++ case EV_RS_GRAND_MASTER:
> ++ next = PS_GRAND_MASTER;
> ++ break;
> ++ case EV_RS_SLAVE:
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ case EV_RS_PASSIVE:
> ++ next = PS_PASSIVE;
> ++ break;
> ++ case EV_RS_PSLAVE:
> ++ next = PS_PASSIVE_SLAVE;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_SLAVE:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES:
> ++ next = PS_MASTER;
> ++ break;
> ++ case EV_SYNCHRONIZATION_FAULT:
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ case EV_RS_MASTER:
> ++ next = PS_PRE_MASTER;
> ++ break;
> ++ case EV_RS_GRAND_MASTER:
> ++ next = PS_GRAND_MASTER;
> ++ break;
> ++ case EV_RS_SLAVE:
> ++ if (mdiff)
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ case EV_RS_PASSIVE:
> ++ next = PS_PASSIVE;
> ++ break;
> ++ case EV_RS_PSLAVE:
> ++ next = PS_PASSIVE_SLAVE;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_PASSIVE_SLAVE:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_RS_MASTER:
> ++ case EV_RS_GRAND_MASTER:
> ++ case EV_RS_SLAVE:
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ case EV_ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES:
> ++ next = PS_MASTER;
> ++ break;
> ++ case EV_NONE:
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++ }
> ++
> ++ return next;
> ++}
> ++
> ++enum port_state ptp_red_slave_fsm(enum port_state state, enum fsm_event
> event,
> ++ int mdiff)
> ++{
> ++ enum port_state next = state;
> ++
> ++ if (EV_INITIALIZE == event || EV_POWERUP == event)
> ++ return PS_INITIALIZING;
> ++
> ++ switch (state) {
> ++ case PS_INITIALIZING:
> ++ switch (event) {
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_INIT_COMPLETE:
> ++ next = PS_LISTENING;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_FAULTY:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_CLEARED:
> ++ next = PS_INITIALIZING;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_DISABLED:
> ++ if (EV_DESIGNATED_ENABLED == event)
> ++ next = PS_INITIALIZING;
> ++ break;
> ++
> ++ case PS_LISTENING:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES:
> ++ case EV_RS_MASTER:
> ++ case EV_RS_GRAND_MASTER:
> ++ case EV_RS_PASSIVE:
> ++ next = PS_LISTENING;
> ++ break;
> ++ case EV_RS_SLAVE:
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ case EV_RS_PSLAVE:
> ++ next = PS_PASSIVE_SLAVE;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_UNCALIBRATED:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES:
> ++ case EV_RS_MASTER:
> ++ case EV_RS_GRAND_MASTER:
> ++ case EV_RS_PASSIVE:
> ++ next = PS_LISTENING;
> ++ break;
> ++ case EV_MASTER_CLOCK_SELECTED:
> ++ next = PS_SLAVE;
> ++ break;
> ++ case EV_RS_PSLAVE:
> ++ next = PS_PASSIVE_SLAVE;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_SLAVE:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES:
> ++ case EV_RS_MASTER:
> ++ case EV_RS_GRAND_MASTER:
> ++ case EV_RS_PASSIVE:
> ++ next = PS_LISTENING;
> ++ break;
> ++ case EV_SYNCHRONIZATION_FAULT:
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ case EV_RS_SLAVE:
> ++ if (mdiff)
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ case EV_RS_PSLAVE:
> ++ next = PS_PASSIVE_SLAVE;
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ case PS_PASSIVE_SLAVE:
> ++ switch (event) {
> ++ case EV_DESIGNATED_DISABLED:
> ++ next = PS_DISABLED;
> ++ break;
> ++ case EV_FAULT_DETECTED:
> ++ next = PS_FAULTY;
> ++ break;
> ++ case EV_ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES:
> ++ case EV_RS_MASTER:
> ++ case EV_RS_GRAND_MASTER:
> ++ case EV_RS_PASSIVE:
> ++ next = PS_LISTENING;
> ++ break;
> ++ case EV_SYNCHRONIZATION_FAULT:
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ case EV_RS_SLAVE:
> ++ next = PS_UNCALIBRATED;
> ++ break;
> ++ case EV_RS_PSLAVE:
> ++ next = PS_PASSIVE_SLAVE;
> ++ break;
> ++ case EV_NONE:
> ++ break;
> ++ default:
> ++ break;
> ++ }
> ++ break;
> ++
> ++ default:
> ++ break;
> ++ }
> ++
> ++ return next;
> ++}
> +diff --git a/fsm.h b/fsm.h
> +index e07d9a9..60f2805 100644
> +--- a/fsm.h
> ++++ b/fsm.h
> +@@ -60,6 +60,7 @@ enum fsm_event {
> + enum bmca_select {
> + BMCA_PTP,
> + BMCA_NOOP,
> ++ BMCA_RED_MASTER,
> + };
> +
> + /**
> +@@ -81,4 +82,22 @@ enum port_state ptp_fsm(enum port_state state, enum
> fsm_event event, int mdiff);
> + enum port_state ptp_slave_fsm(enum port_state state, enum fsm_event event,
> + int mdiff);
> +
> ++/**
> ++ * Run the state machine for a TC+OC setup on a redundant port setup.
> ++ * @param state The current state of the port.
> ++ * @param event The event to be processed.
> ++ * @param mdiff Whether a new master has been selected.
> ++ * @return The new state for the port.
> ++ */
> ++enum port_state ptp_red_m_fsm(enum port_state state, enum fsm_event event,
> int mdiff);
> ++
> ++/**
> ++ * Run the state machine for a TC+OC setup on a redundant port setup for a
> salve only clock.
> ++ * @param state The current state of the port.
> ++ * @param event The event to be processed.
> ++ * @param mdiff Whether a new master has been selected.
> ++ * @return The new state for the port.
> ++ */
> ++enum port_state ptp_red_slave_fsm(enum port_state state, enum fsm_event
> event, int mdiff);
> ++
> + #endif
> +diff --git a/port.c b/port.c
> +index 586e365..7ade639 100644
> +--- a/port.c
> ++++ b/port.c
> +@@ -3628,6 +3628,8 @@ struct port *port_open(const char *phc_device,
> + pr_err("Please enable at least one of serverOnly or
> clientOnly when BMCA == noop.\n");
> + goto err_transport;
> + }
> ++ } else if (p->bmca == BMCA_RED_MASTER) {
> ++ p->state_machine = clock_slave_only(clock) ? ptp_red_slave_fsm
> : ptp_red_m_fsm;
> + } else {
> + p->state_machine = clock_slave_only(clock) ? ptp_slave_fsm :
> ptp_fsm;
> + }
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0007-p2p_hc-Add-a-double-attached-clock-hybrid-clock-HC.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0007-p2p_hc-Add-a-double-attached-clock-hybrid-clock-HC.patch
> new file mode 100644
> index 00000000..212e28b0
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0007-p2p_hc-Add-a-double-attached-clock-hybrid-clock-HC.patch
> @@ -0,0 +1,444 @@
> +From 13b25f731684d21102a8a288ab74d6bfcfe24640 Mon Sep 17 00:00:00 2001
> +From: Sebastian Andrzej Siewior <[email protected]>
> +Date: Thu, 2 Oct 2025 10:39:45 +0200
> +Subject: [PATCH 07/13] p2p_hc: Add a double attached clock, hybrid clock
> (HC).
> +MIME-Version: 1.0
> +Content-Type: text/plain; charset=UTF-8
> +Content-Transfer-Encoding: 8bit
> +
> +The double attached clock, hybrid clock, is described in IEC 62439-3 for
> +the two PRP/ HSR scenario with two ports.
> +
> + ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
> + ┃ ┃
> + ┃ Doubly Attached Node ┃
> + ┃ ┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄ ┃
> + ┃ ╭────╮ ┃
> + ┃ │ OC │ ┃
> + ┃ ╰────╯ ┃
> + ┃ ║ ┃
> + ┃ ║ ┃
> + ┃ ╭────╮ ┃
> + ┃ ╔══════│ TC │══════╗ ┃
> + ┃ ║ ╰────╯ ║ ┃
> + ┃ ╭──────╮ ╭──────╮ ┃
> + ┃ │Port A│ │Port B│ ┃
> + ┃ ╰──────╯ ╰──────╯ ┃
> + ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
> +
> +The TC has three ports: One for each networking port and one for the OC.
> +The TC forwards SYNC packets from port A to B and to the OC to consume
> +it. It sends PDELAY_* messages and responds to them.
> +The OC receives usually two SYNC message which the TC received on both
> +ports. It keeps the "better" one and ignores the other. Therefore it
> +synchronises only against one of the two ports. In master mode the OC
> +sends a SYNC message on both ports.
> +
> +Add a HC which implements a TC and OC. Use it if the OC is set and clock
> +type is doubly attached.
> +The clock is assigned as a special case of OC/ BC. The PTP specification
> +mentions clockType for OC/ BC as 0/ 1 but the code is using 0x8000/
> +0x4000. I don't where this is used so it pretends to be a OC.
> +
> +Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Submitted
> + Submitted to upstream, waiting approval
> + https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00011.html
> +
> + makefile | 2 +-
> + p2p_hc.c | 331 +++++++++++++++++++++++++++++++++++++++++++++++++
> + port.c | 9 +-
> + port_private.h | 3 +
> + 4 files changed, 342 insertions(+), 3 deletions(-)
> + create mode 100644 p2p_hc.c
> +
> +diff --git a/makefile b/makefile
> +index 50c2d5a..e42e147 100644
> +--- a/makefile
> ++++ b/makefile
> +@@ -31,7 +31,7 @@ TS2PHC = ts2phc.o lstab.o nmea.o serial.o sock.o
> ts2phc_generic_pps_source.o \
> + ts2phc_nmea_pps_source.o ts2phc_phc_pps_source.o ts2phc_pps_sink.o
> ts2phc_pps_source.o
> + OBJ = bmc.o clock.o clockadj.o clockcheck.o config.o designated_fsm.o \
> + e2e_tc.o fault.o $(FILTERS) fsm.o hash.o interface.o monitor.o msg.o phc.o
> \
> +- pmc_common.o port.o port_signaling.o pqueue.o print.o ptp4l.o p2p_tc.o
> rtnl.o \
> ++ pmc_common.o port.o port_signaling.o pqueue.o print.o ptp4l.o p2p_tc.o
> p2p_hc.o rtnl.o \
> + $(SECURITY) $(SERVOS) sk.o stats.o tc.o $(TRANSP) telecom.o tlv.o tsproc.o
> \
> + unicast_client.o unicast_fsm.o unicast_service.o util.o version.o
> +
> +diff --git a/p2p_hc.c b/p2p_hc.c
> +new file mode 100644
> +index 0000000..4c0dbd8
> +--- /dev/null
> ++++ b/p2p_hc.c
> +@@ -0,0 +1,331 @@
> ++/**
> ++ * @file p2p_hc.c
> ++ * @brief Implements a Hybrid Clock (Transparent Clock + Ordinary Clock).
> ++ * @note Copyright (C) 2025 Sebastian Andrzej Siewior
> <[email protected]>
> ++ * @note Based on TC/OC which is
> ++ * @note Copyright (C) 2018 Richard Cochran <[email protected]>
> ++ * @note SPDX-License-Identifier: GPL-2.0+
> ++ */
> ++#include <errno.h>
> ++
> ++#include "port.h"
> ++#include "port_private.h"
> ++#include "print.h"
> ++#include "rtnl.h"
> ++#include "sad.h"
> ++#include "tc.h"
> ++
> ++static int p2p_hc_delay_request(struct port *p)
> ++{
> ++ switch (p->state) {
> ++ case PS_INITIALIZING:
> ++ case PS_FAULTY:
> ++ case PS_DISABLED:
> ++ return 0;
> ++ case PS_LISTENING:
> ++ case PS_PRE_MASTER:
> ++ case PS_MASTER:
> ++ case PS_PASSIVE:
> ++ case PS_UNCALIBRATED:
> ++ case PS_SLAVE:
> ++ case PS_GRAND_MASTER:
> ++ case PS_PASSIVE_SLAVE:
> ++ break;
> ++ }
> ++ return port_delay_request(p);
> ++}
> ++
> ++static int port_set_sync_tx_tmo(struct port *p)
> ++{
> ++ return set_tmo_log(p->fda.fd[FD_SYNC_TX_TIMER], 1, p->logSyncInterval);
> ++}
> ++
> ++static void flush_peer_delay(struct port *p)
> ++{
> ++ if (p->peer_delay_req) {
> ++ msg_put(p->peer_delay_req);
> ++ p->peer_delay_req = NULL;
> ++ }
> ++ if (p->peer_delay_resp) {
> ++ msg_put(p->peer_delay_resp);
> ++ p->peer_delay_resp = NULL;
> ++ }
> ++ if (p->peer_delay_fup) {
> ++ msg_put(p->peer_delay_fup);
> ++ p->peer_delay_fup = NULL;
> ++ }
> ++}
> ++
> ++void p2p_hc_dispatch(struct port *p, enum fsm_event event, int mdiff)
> ++{
> ++ if (clock_slave_only(p->clock)) {
> ++ if (event == EV_RS_GRAND_MASTER) {
> ++ const char *n = p->log_name;
> ++ pr_warning("%s: master state recommended in slave only
> mode", n);
> ++ pr_warning("%s: defaultDS.priority1 probably
> misconfigured", n);
> ++ }
> ++ }
> ++
> ++ if (!port_state_update(p, event, mdiff)) {
> ++ return;
> ++ }
> ++
> ++ if (!portnum(p)) {
> ++ /* UDS needs no timers. */
> ++ return;
> ++ }
> ++ /* port_p2p_transition */
> ++ port_clr_tmo(p->fda.fd[FD_ANNOUNCE_TIMER]);
> ++ port_clr_tmo(p->fda.fd[FD_SYNC_RX_TIMER]);
> ++ /* Leave FD_DELAY_TIMER running. */
> ++ port_clr_tmo(p->fda.fd[FD_QUALIFICATION_TIMER]);
> ++ port_clr_tmo(p->fda.fd[FD_MANNO_TIMER]);
> ++ port_clr_tmo(p->fda.fd[FD_SYNC_TX_TIMER]);
> ++
> ++ /*
> ++ * Handle the side effects of the state transition.
> ++ */
> ++ switch (p->state) {
> ++ case PS_INITIALIZING:
> ++ break;
> ++ case PS_FAULTY:
> ++ case PS_DISABLED:
> ++ port_disable(p);
> ++ sad_set_last_seqid(clock_config(p->clock), p->spp, -1);
> ++ break;
> ++ case PS_LISTENING:
> ++ port_set_announce_tmo(p);
> ++ port_set_delay_tmo(p);
> ++ break;
> ++ case PS_PRE_MASTER:
> ++ port_set_qualification_tmo(p);
> ++ break;
> ++ case PS_MASTER:
> ++ case PS_GRAND_MASTER:
> ++ if (!p->inhibit_announce) {
> ++ set_tmo_log(p->fda.fd[FD_MANNO_TIMER], 1, -10); /*~1ms*/
> ++ }
> ++ port_set_sync_tx_tmo(p);
> ++ sad_set_last_seqid(clock_config(p->clock), p->spp, -1);
> ++ break;
> ++ case PS_PASSIVE:
> ++ port_set_announce_tmo(p);
> ++ break;
> ++ case PS_UNCALIBRATED:
> ++ flush_last_sync(p);
> ++ flush_peer_delay(p);
> ++ sad_set_last_seqid(clock_config(p->clock), p->spp, -1);
> ++ /* fall through */
> ++ case PS_SLAVE:
> ++ case PS_PASSIVE_SLAVE:
> ++ port_set_announce_tmo(p);
> ++ break;
> ++ };
> ++}
> ++
> ++static int port_set_manno_tmo(struct port *p)
> ++{
> ++ return set_tmo_log(p->fda.fd[FD_MANNO_TIMER], 1,
> p->logAnnounceInterval);
> ++}
> ++
> ++enum fsm_event p2p_hc_event(struct port *p, int fd_index)
> ++{
> ++ int cnt, err, fd = p->fda.fd[fd_index];
> ++ enum fsm_event event = EV_NONE;
> ++ struct ptp_message *msg, *dup;
> ++
> ++ switch (fd_index) {
> ++ case FD_ANNOUNCE_TIMER:
> ++ case FD_SYNC_RX_TIMER:
> ++ pr_debug("%s: %s timeout", p->log_name,
> ++ fd_index == FD_SYNC_RX_TIMER ? "rx sync" : "announce");
> ++ if (p->best) {
> ++ fc_clear(p->best);
> ++ }
> ++
> ++ if (fd_index == FD_SYNC_RX_TIMER) {
> ++ p->service_stats.sync_timeout++;
> ++ } else {
> ++ p->service_stats.announce_timeout++;
> ++ }
> ++
> ++ if (p->inhibit_announce) {
> ++ port_clr_tmo(p->fda.fd[FD_ANNOUNCE_TIMER]);
> ++ } else {
> ++ port_set_announce_tmo(p);
> ++ }
> ++
> ++ if (p->inhibit_announce) {
> ++ return EV_NONE;
> ++ }
> ++ return EV_ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES;
> ++
> ++ case FD_DELAY_TIMER:
> ++ pr_debug("%s: delay timeout", p->log_name);
> ++ port_set_delay_tmo(p);
> ++ tc_prune(p);
> ++ return p2p_hc_delay_request(p) ? EV_FAULT_DETECTED : EV_NONE;
> ++
> ++ case FD_QUALIFICATION_TIMER:
> ++ pr_debug("%s: qualification timeout", p->log_name);
> ++ p->service_stats.qualification_timeout++;
> ++ return EV_QUALIFICATION_TIMEOUT_EXPIRES;
> ++
> ++ case FD_MANNO_TIMER:
> ++ pr_debug("%s: master tx announce timeout", p->log_name);
> ++ port_set_manno_tmo(p);
> ++ p->service_stats.master_announce_timeout++;
> ++ clock_update_leap_status(p->clock);
> ++ return port_tx_announce(p, NULL, p->seqnum.announce++) ?
> ++ EV_FAULT_DETECTED : EV_NONE;
> ++
> ++ case FD_SYNC_TX_TIMER:
> ++ pr_debug("%s: master sync timeout", p->log_name);
> ++ port_set_sync_tx_tmo(p);
> ++ p->service_stats.master_sync_timeout++;
> ++ return port_tx_sync(p, NULL, p->seqnum.sync++) ?
> ++ EV_FAULT_DETECTED : EV_NONE;
> ++
> ++ case FD_UNICAST_REQ_TIMER:
> ++ case FD_UNICAST_SRV_TIMER:
> ++ pr_err("unexpected timer expiration");
> ++ return EV_NONE;
> ++
> ++ case FD_RTNL:
> ++ pr_debug("%s: received link status notification", p->log_name);
> ++ rtnl_link_status(fd, p->name, port_link_status, p);
> ++ if (p->link_status == (LINK_UP|LINK_STATE_CHANGED)) {
> ++ return EV_FAULT_CLEARED;
> ++ } else if ((p->link_status == (LINK_DOWN|LINK_STATE_CHANGED)) ||
> ++ (p->link_status & TS_LABEL_CHANGED)) {
> ++ return EV_FAULT_DETECTED;
> ++ } else {
> ++ return EV_NONE;
> ++ }
> ++ }
> ++
> ++ msg = msg_allocate();
> ++ if (!msg) {
> ++ return EV_FAULT_DETECTED;
> ++ }
> ++ msg->hwts.type = p->timestamping;
> ++
> ++ cnt = transport_recv(p->trp, fd, msg);
> ++ if (cnt <= 0) {
> ++ pr_err("%s: recv message failed", p->log_name);
> ++ msg_put(msg);
> ++ return EV_FAULT_DETECTED;
> ++ }
> ++
> ++ if (msg_sots_valid(msg)) {
> ++ ts_add(&msg->hwts.ts, -p->rx_timestamp_offset);
> ++ }
> ++ if (msg_unicast(msg)) {
> ++ pl_warning(600, "cannot switch unicast messages! type %s",
> ++ msg_type_string(msg_type(msg)));
> ++ msg_put(msg);
> ++ return EV_NONE;
> ++ }
> ++
> ++ dup = msg_duplicate(msg, cnt);
> ++ if (!dup) {
> ++ msg_put(msg);
> ++ return EV_NONE;
> ++ }
> ++ msg_tlv_copy(dup, msg);
> ++ if (tc_ignore(p, dup)) {
> ++ msg_put(dup);
> ++ dup = NULL;
> ++ } else {
> ++ err = sad_process_auth(clock_config(p->clock), p->spp, dup,
> msg);
> ++ if (err) {
> ++ switch (err) {
> ++ case -EBADMSG:
> ++ pr_err("%s: auth: bad message", p->log_name);
> ++ break;
> ++ case -EPROTO:
> ++ pr_debug("%s: auth: ignoring message",
> p->log_name);
> ++ break;
> ++ }
> ++ msg_put(msg);
> ++ if (dup) {
> ++ msg_put(dup);
> ++ }
> ++ return EV_NONE;
> ++ }
> ++ }
> ++
> ++ switch (msg_type(msg)) {
> ++ case SYNC:
> ++ if (tc_fwd_sync(p, msg)) {
> ++ event = EV_FAULT_DETECTED;
> ++ break;
> ++ }
> ++ if (dup) {
> ++ process_sync(p, dup);
> ++ }
> ++ break;
> ++ case DELAY_REQ:
> ++ break;
> ++ case PDELAY_REQ:
> ++ if (dup && process_pdelay_req(p, dup)) {
> ++ event = EV_FAULT_DETECTED;
> ++ }
> ++ break;
> ++ case PDELAY_RESP:
> ++ if (dup && process_pdelay_resp(p, dup)) {
> ++ event = EV_FAULT_DETECTED;
> ++ }
> ++ break;
> ++ case FOLLOW_UP:
> ++ if (tc_fwd_folup(p, msg)) {
> ++ event = EV_FAULT_DETECTED;
> ++ break;
> ++ }
> ++ if (dup) {
> ++ process_follow_up(p, dup);
> ++ }
> ++ break;
> ++ case DELAY_RESP:
> ++ break;
> ++ case PDELAY_RESP_FOLLOW_UP:
> ++ if (dup) {
> ++ process_pdelay_resp_fup(p, dup);
> ++ }
> ++ break;
> ++ case ANNOUNCE:
> ++ if (tc_forward(p, msg)) {
> ++ event = EV_FAULT_DETECTED;
> ++ break;
> ++ }
> ++ if (dup && process_announce(p, dup)) {
> ++ event = EV_STATE_DECISION_EVENT;
> ++ }
> ++ break;
> ++ case SIGNALING:
> ++ if (tc_forward(p, msg)) {
> ++ event = EV_FAULT_DETECTED;
> ++ break;
> ++ }
> ++ if (dup && process_signaling(p, dup)) {
> ++ event = EV_FAULT_DETECTED;
> ++ }
> ++ break;
> ++
> ++ case MANAGEMENT:
> ++ if (tc_forward(p, msg)) {
> ++ event = EV_FAULT_DETECTED;
> ++ break;
> ++ }
> ++ if (dup && clock_manage(p->clock, p, dup)) {
> ++ event = EV_STATE_DECISION_EVENT;
> ++ }
> ++ break;
> ++ }
> ++
> ++ msg_put(msg);
> ++ if (dup) {
> ++ msg_put(dup);
> ++ }
> ++ return event;
> ++}
> +diff --git a/port.c b/port.c
> +index 7ade639..50a3a75 100644
> +--- a/port.c
> ++++ b/port.c
> +@@ -3592,8 +3592,13 @@ struct port *port_open(const char *phc_device,
> + switch (type) {
> + case CLOCK_TYPE_ORDINARY:
> + case CLOCK_TYPE_BOUNDARY:
> +- p->dispatch = bc_dispatch;
> +- p->event = bc_event;
> ++ if (clock_type_is_DAC(clock)) {
> ++ p->dispatch = p2p_hc_dispatch;
> ++ p->event = p2p_hc_event;
> ++ } else {
> ++ p->dispatch = bc_dispatch;
> ++ p->event = bc_event;
> ++ }
> + break;
> + case CLOCK_TYPE_P2P:
> + p->dispatch = p2p_dispatch;
> +diff --git a/port_private.h b/port_private.h
> +index 79b1d31..507c296 100644
> +--- a/port_private.h
> ++++ b/port_private.h
> +@@ -185,6 +185,9 @@ enum fsm_event e2e_event(struct port *p, int fd_index);
> + void p2p_dispatch(struct port *p, enum fsm_event event, int mdiff);
> + enum fsm_event p2p_event(struct port *p, int fd_index);
> +
> ++void p2p_hc_dispatch(struct port *p, enum fsm_event event, int mdiff);
> ++enum fsm_event p2p_hc_event(struct port *p, int fd_index);
> ++
> + int clear_fault_asap(struct fault_interval *faint);
> + void delay_req_prune(struct port *p);
> + void fc_clear(struct foreign_clock *fc);
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0008-tc-Allow-to-forward-packets-both-ways-in-DAC-mode.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0008-tc-Allow-to-forward-packets-both-ways-in-DAC-mode.patch
> new file mode 100644
> index 00000000..0f1f1720
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0008-tc-Allow-to-forward-packets-both-ways-in-DAC-mode.patch
> @@ -0,0 +1,37 @@
> +From 104fcfab6c17c3dfd2d72e1da51e631355d4f204 Mon Sep 17 00:00:00 2001
> +From: Sebastian Andrzej Siewior <[email protected]>
> +Date: Thu, 2 Oct 2025 10:45:44 +0200
> +Subject: [PATCH 08/13] tc: Allow to forward packets both ways in DAC mode
> +
> +In a HSR/ DAC setup, the TC should forward SYNC, FOLLOW-UP packets in
> +both directions.
> +
> +Allow to forward packets both ways in DAC mode.
> +
> +Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Submitted
> + Submitted to upstream, waiting approval
> + https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00018.html
> +
> + tc.c | 2 +-
> + 1 file changed, 1 insertion(+), 1 deletion(-)
> +
> +diff --git a/tc.c b/tc.c
> +index 0fd1bc4..109947d 100644
> +--- a/tc.c
> ++++ b/tc.c
> +@@ -105,7 +105,7 @@ static int tc_blocked(struct port *q, struct port *p,
> struct ptp_message *m)
> + case PS_SLAVE:
> + case PS_PASSIVE_SLAVE:
> + /* Delay_Req swims against the stream. */
> +- if (msg_type(m) != DELAY_REQ) {
> ++ if (!clock_type_is_DAC(p->clock) && msg_type(m) != DELAY_REQ) {
> + return 1;
> + }
> + break;
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0009-port-Add-a-safe-guard-in-case-PASSIVE_SLAVE-attempts.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0009-port-Add-a-safe-guard-in-case-PASSIVE_SLAVE-attempts.patch
> new file mode 100644
> index 00000000..c979b42b
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0009-port-Add-a-safe-guard-in-case-PASSIVE_SLAVE-attempts.patch
> @@ -0,0 +1,37 @@
> +From e8a1ada27bd5065fcbe04d1f56db05060cfe967f Mon Sep 17 00:00:00 2001
> +From: Sebastian Andrzej Siewior <[email protected]>
> +Date: Thu, 2 Oct 2025 10:46:17 +0200
> +Subject: [PATCH 09/13] port: Add a safe guard in case PASSIVE_SLAVE attempts
> + to sync
> +
> +Add a error message in case port_synchronize() attempts to synchronize
> +the lock on a port in PASSIVE_SLAVE state.
> +
> +Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Submitted
> + Submitted to upstream, waiting approval
> + https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00015.html
> +
> + port.c | 3 +++
> + 1 file changed, 3 insertions(+)
> +
> +diff --git a/port.c b/port.c
> +index 50a3a75..68d77ad 100644
> +--- a/port.c
> ++++ b/port.c
> +@@ -1434,6 +1434,9 @@ static void port_synchronize(struct port *p,
> + clock_parent_identity(p->clock), seqid,
> + t1, tmv_add(c1, c2), t2);
> + break;
> ++ case PS_PASSIVE_SLAVE:
> ++ pr_err("Port in passive slave attempts to synchronize");
> ++ return;
> + default:
> + break;
> + }
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0010-tc-Allow-to-forward-packets-in-LISTEN-state.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0010-tc-Allow-to-forward-packets-in-LISTEN-state.patch
> new file mode 100644
> index 00000000..2618868b
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0010-tc-Allow-to-forward-packets-in-LISTEN-state.patch
> @@ -0,0 +1,61 @@
> +From 04c95905fd0d323930e2fe443c59a127e301c818 Mon Sep 17 00:00:00 2001
> +From: Sebastian Andrzej Siewior <[email protected]>
> +Date: Thu, 2 Oct 2025 13:01:53 +0200
> +Subject: [PATCH 10/13] tc: Allow to forward packets in LISTEN state
> +
> +In the HSR/ DAC network, the port which receives ANNOUNCE messages
> +enters SLAVE state. The other port remains in LISTEN state since it does
> +not receive any PTP packets.
> +The tc_blocked() forbids to forward a packet if the EGRESS port is in
> +listen state.
> +
> +Allow to forward packets if the EGRESS port is in LISTEN state. If the
> +packets make their way through the ring, the port will eventually switch
> +to PASSIVE_SLAVE state.
> +
> +Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Submitted
> + Submitted to upstream, waiting approval
> + https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00019.html
> +
> + tc.c | 4 ++--
> + 1 file changed, 2 insertions(+), 2 deletions(-)
> +
> +diff --git a/tc.c b/tc.c
> +index 109947d..15b83c4 100644
> +--- a/tc.c
> ++++ b/tc.c
> +@@ -75,7 +75,6 @@ static int tc_blocked(struct port *q, struct port *p,
> struct ptp_message *m)
> + case PS_INITIALIZING:
> + case PS_FAULTY:
> + case PS_DISABLED:
> +- case PS_LISTENING:
> + case PS_PRE_MASTER:
> + case PS_PASSIVE:
> + return 1;
> +@@ -86,6 +85,7 @@ static int tc_blocked(struct port *q, struct port *p,
> struct ptp_message *m)
> + return 1;
> + }
> + break;
> ++ case PS_LISTENING:
> + case PS_UNCALIBRATED:
> + case PS_SLAVE:
> + case PS_PASSIVE_SLAVE:
> +@@ -97,10 +97,10 @@ static int tc_blocked(struct port *q, struct port *p,
> struct ptp_message *m)
> + case PS_INITIALIZING:
> + case PS_FAULTY:
> + case PS_DISABLED:
> +- case PS_LISTENING:
> + case PS_PRE_MASTER:
> + case PS_PASSIVE:
> + return 1;
> ++ case PS_LISTENING:
> + case PS_UNCALIBRATED:
> + case PS_SLAVE:
> + case PS_PASSIVE_SLAVE:
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0011-raw-Add-HSR-handling.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0011-raw-Add-HSR-handling.patch
> new file mode 100644
> index 00000000..8de6a039
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0011-raw-Add-HSR-handling.patch
> @@ -0,0 +1,567 @@
> +From 96629470ca54aba5049414c8fdd67427d8cdec9a Mon Sep 17 00:00:00 2001
> +From: Sebastian Andrzej Siewior <[email protected]>
> +Date: Wed, 22 Oct 2025 15:42:28 +0200
> +Subject: [PATCH 11/13] raw: Add HSR handling
> +MIME-Version: 1.0
> +Content-Type: text/plain; charset=UTF-8
> +Content-Transfer-Encoding: 8bit
> +
> +In a HSR network each device as two port attached to the HSR ring. The
> +two ports are usually called port A and port B. The communication is
> +Ethernet based and the payload part is ETH_P_HSR. After the HSR header,
> +for PTP the payload is ETH_P_1588 as usual. So we have either
> +
> + ┌─────────┬─────────┬─────────┬─────┐
> + │ MAC DST │ MAC SRC │ HSR-TAG │ PTP │
> + └─────────┴─────────┴─────────┴─────┘
> +or with VLAN enabled
> + ┌─────────┬─────────┬──────────┬─────────┬─────┐
> + │ MAC DST │ MAC SRC │ VLAN-TAG │ HSR-TAG │ PTP │
> + └─────────┴─────────┴──────────┴─────────┴─────┘
> +
> +The kernel is supposed not to forward HSR packets with ETH_P_1588
> +payload. Also it must support socket option PACKET_HSR_BIND_PORT to bind
> +the hsr device to one of the two ports via PACKET_HSR_BIND_PORT_A or
> +PACKET_HSR_BIND_PORT_B. It needs to support PACKET_HSR_INFO with the
> +option PACKET_HSR_INFO_HAS_HDR for the control message in order to send
> +HSR with a HSR header. These changes are not merged into the upstream.
> +
> +This interface is used by ptp4l to receive both copies of a packets and
> +to send a packet on one of the two ports including a PTP timestamp.
> +
> +The clock is setup as TC which means the forwarding done by ptp4l will
> +properly update the correction header. The HSR header of a received
> +message is saved so it can be used while the packet is forwarded. This
> +is important to keep the MAC address of the sender but also to keep HSR
> +fields such as sequence number or port.
> +The PDELAY_* packets are not forwarded and instead responded to. Here
> +the HSR header is constructed by the HSR stack and the packet is sent
> +only on the request port.
> +
> +The added BPF filter is based on the existing one and adds HSR type
> +handling and ignores possible VLAN. The filter drops all packets which
> +are sent by "us". The sender is supposed to remove his packets from the
> +ring.
> +
> +Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Submitted
> + Submitted to upstream, waiting approval
> + https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00012.html
> +
> + ether.h | 9 ++
> + missing.h | 13 +++
> + msg.c | 3 +-
> + msg.h | 6 ++
> + raw.c | 312 +++++++++++++++++++++++++++++++++++++++++++++++-------
> + 5 files changed, 301 insertions(+), 42 deletions(-)
> +
> +diff --git a/ether.h b/ether.h
> +index 276eec4..577a07e 100644
> +--- a/ether.h
> ++++ b/ether.h
> +@@ -48,4 +48,13 @@ struct vlan_hdr {
> + uint16_t type;
> + } __attribute__((packed));
> +
> ++struct hsr_hdr {
> ++ eth_addr dst;
> ++ eth_addr src;
> ++ uint16_t type;
> ++ uint16_t pathid_and_LSDU_size;
> ++ uint16_t sequence_nr;
> ++ uint16_t encap_type;
> ++} __attribute__((packed));
> ++
> + #endif
> +diff --git a/missing.h b/missing.h
> +index c6be8fd..583e035 100644
> +--- a/missing.h
> ++++ b/missing.h
> +@@ -137,6 +137,19 @@ enum {
> + #define PTP_PEROUT_REQUEST2 PTP_PEROUT_REQUEST
> + #endif
> +
> ++#ifndef PACKET_HSR_BIND_PORT
> ++#define PACKET_HSR_BIND_PORT 25
> ++
> ++/* For HSR, bind port */
> ++#define PACKET_HSR_BIND_PORT_AB 0
> ++#define PACKET_HSR_BIND_PORT_A 1
> ++#define PACKET_HSR_BIND_PORT_B 2
> ++/* HSR, CMSG */
> ++#define PACKET_HSR_INFO 1
> ++#define PACKET_HSR_INFO_HAS_HDR 1
> ++
> ++#endif
> ++
> + #if LINUX_VERSION_CODE < KERNEL_VERSION(6,5,0)
> +
> + /* from upcoming Linux kernel version 6.5 */
> +diff --git a/msg.c b/msg.c
> +index 7c236c3..9989456 100644
> +--- a/msg.c
> ++++ b/msg.c
> +@@ -32,7 +32,8 @@ int assume_two_step = 0;
> + uint8_t ptp_hdr_ver = PTP_VERSION;
> +
> + /*
> +- * Head room fits a VLAN Ethernet header, and 'msg' is 64 bit aligned.
> ++ * Head room fits a VLAN Ethernet header or a HSR-Ethernet header, and
> 'msg' is
> ++ * 64 bit aligned.
> + */
> + #define MSG_HEADROOM 24
> +
> +diff --git a/msg.h b/msg.h
> +index 58c2287..c53e07b 100644
> +--- a/msg.h
> ++++ b/msg.h
> +@@ -29,6 +29,7 @@
> + #include "ddt.h"
> + #include "tlv.h"
> + #include "tmv.h"
> ++#include "ether.h"
> +
> + /* Version definition for IEEE 1588-2019 */
> + #define PTP_MAJOR_VERSION 2
> +@@ -238,6 +239,11 @@ struct ptp_message {
> + * pointers to the appended TLVs.
> + */
> + TAILQ_HEAD(tlv_list, tlv_extra) tlv_list;
> ++ /**
> ++ * Containing the HSR header
> ++ */
> ++ struct hsr_hdr hsr_header;
> ++ int hsr_header_valid;
> + };
> +
> + /**
> +diff --git a/raw.c b/raw.c
> +index c809233..eb01072 100644
> +--- a/raw.c
> ++++ b/raw.c
> +@@ -46,6 +46,7 @@
> + #include "sk.h"
> + #include "transport_private.h"
> + #include "util.h"
> ++#include "rtnl.h"
> +
> + struct raw {
> + struct transport t;
> +@@ -53,10 +54,87 @@ struct raw {
> + struct address ptp_addr;
> + struct address p2p_addr;
> + int vlan;
> ++ int hsr_slave;
> + };
> +
> + #define PRP_TRAILER_LEN 6
> +
> ++/*
> ++ * tcpdump -d
> ++ * 'ether[12:2] == 0x892f && ether[18:2] == 0x88F7 and
> ++ * (ether[18 +2:1] & 0x8 == 0x8) &&
> ++ * not ether src 11:22:33:44:55:66'
> ++ *
> ++ * (000) ldh [12]
> ++ * (001) jeq #0x892f jt 2 jf 12
> ++ * (002) ldh [18]
> ++ * (003) jeq #0x88f7 jt 4 jf 12
> ++ * (004) ldb [20]
> ++ * (005) and #0x8
> ++ * (006) jeq #0x8 jt 7 jf 12
> ++ * (007) ld [8]
> ++ * (008) jeq #0x33445566 jt 9 jf 11
> ++ * (009) ldh [6]
> ++ * (010) jeq #0x1122 jt 12 jf 11
> ++ * (011) ret #262144
> ++ * (012) ret #0
> ++ */
> ++static struct sock_filter raw_filter_hsr_norm_general[] = {
> ++ { 0x28, 0, 0, 0x0000000c },
> ++ { 0x15, 0, 10, 0x0000892f },
> ++ { 0x28, 0, 0, 0x00000012 },
> ++ { 0x15, 0, 8, 0x000088f7 },
> ++ { 0x30, 0, 0, 0x00000014 },
> ++ { 0x54, 0, 0, 0x00000008 },
> ++ { 0x15, 0, 5, 0x00000008 },
> ++ { 0x20, 0, 0, 0x00000008 },
> ++ { 0x15, 0, 2, 0x33445566 },
> ++ { 0x28, 0, 0, 0x00000006 },
> ++ { 0x15, 1, 0, 0x00001122 },
> ++ { 0x6, 0, 0, 0x00040000 },
> ++ { 0x6, 0, 0, 0x00000000 },
> ++};
> ++#define FILTER_HSR_GENERAL_SRC0 10
> ++#define FILTER_HSR_GENERAL_SRC2 8
> ++
> ++/*
> ++ * tcpdump -d
> ++ * 'ether[12:2] == 0x892f && ether[18:2] == 0x88F7 and
> ++ * (ether[18 +2:1] & 0x8 != 0x8) &&
> ++ * not ether src 11:22:33:44:55:66'
> ++ *
> ++ * (000) ldh [12]
> ++ * (001) jeq #0x892f jt 2 jf 12
> ++ * (002) ldh [18]
> ++ * (003) jeq #0x88f7 jt 4 jf 12
> ++ * (004) ldb [20]
> ++ * (005) and #0x8
> ++ * (006) jeq #0x8 jt 12 jf 7
> ++ * (007) ld [8]
> ++ * (008) jeq #0x33445566 jt 9 jf 11
> ++ * (009) ldh [6]
> ++ * (010) jeq #0x1122 jt 12 jf 11
> ++ * (011) ret #262144
> ++ * (012) ret #0
> ++ */
> ++static struct sock_filter raw_filter_hsr_norm_event[] = {
> ++ { 0x28, 0, 0, 0x0000000c },
> ++ { 0x15, 0, 10, 0x0000892f },
> ++ { 0x28, 0, 0, 0x00000012 },
> ++ { 0x15, 0, 8, 0x000088f7 },
> ++ { 0x30, 0, 0, 0x00000014 },
> ++ { 0x54, 0, 0, 0x00000008 },
> ++ { 0x15, 5, 0, 0x00000008 },
> ++ { 0x20, 0, 0, 0x00000008 },
> ++ { 0x15, 0, 2, 0x33445566 },
> ++ { 0x28, 0, 0, 0x00000006 },
> ++ { 0x15, 1, 0, 0x00001122 },
> ++ { 0x6, 0, 0, 0x00040000 },
> ++ { 0x6, 0, 0, 0x00000000 },
> ++};
> ++#define FILTER_HSR_EVENT_SRC0 10
> ++#define FILTER_HSR_EVENT_SRC2 8
> ++
> + /*
> + * tcpdump -d \
> + * '((ether[12:2] == 0x8100 and ether[12 + 4 :2] == 0x88F7 and ether[14+4
> :1] & 0x8 == 0x8) or '\
> +@@ -153,32 +231,59 @@ static struct sock_filter raw_filter_vlan_norm_event[]
> = {
> +
> + static int raw_configure(int fd, int event, int index,
> + unsigned char *local_addr, unsigned char *addr1,
> +- unsigned char *addr2, int enable)
> ++ unsigned char *addr2, int enable, int hsr_slave)
> + {
> + int err1, err2, option;
> + struct packet_mreq mreq;
> + struct sock_fprog prg;
> +
> +- if (event) {
> +- prg.len = ARRAY_SIZE(raw_filter_vlan_norm_event);
> +- prg.filter = raw_filter_vlan_norm_event;
> +-
> +- memcpy(&prg.filter[FILTER_EVENT_POS_SRC0].k, local_addr, 2);
> +- memcpy(&prg.filter[FILTER_EVENT_POS_SRC2].k, local_addr + 2, 4);
> +- prg.filter[FILTER_EVENT_POS_SRC0].k =
> +- ntohs(prg.filter[FILTER_EVENT_POS_SRC0].k);
> +- prg.filter[FILTER_EVENT_POS_SRC2].k =
> +- ntohl(prg.filter[FILTER_EVENT_POS_SRC2].k);
> ++ if (hsr_slave) {
> ++ if (event) {
> ++ prg.len = ARRAY_SIZE(raw_filter_hsr_norm_event);
> ++ prg.filter = raw_filter_hsr_norm_event;
> ++
> ++ memcpy(&prg.filter[FILTER_HSR_EVENT_SRC0].k,
> local_addr, 2);
> ++ memcpy(&prg.filter[FILTER_HSR_EVENT_SRC2].k, local_addr
> + 2, 4);
> ++
> ++ prg.filter[FILTER_HSR_EVENT_SRC0].k =
> ++ ntohs(prg.filter[FILTER_HSR_EVENT_SRC0].k);
> ++ prg.filter[FILTER_HSR_EVENT_SRC2].k =
> ++ ntohl(prg.filter[FILTER_HSR_EVENT_SRC2].k);
> ++ } else {
> ++ prg.len = ARRAY_SIZE(raw_filter_hsr_norm_general);
> ++ prg.filter = raw_filter_hsr_norm_general;
> ++
> ++ memcpy(&prg.filter[FILTER_HSR_GENERAL_SRC0].k,
> local_addr, 2);
> ++ memcpy(&prg.filter[FILTER_HSR_GENERAL_SRC2].k,
> local_addr + 2, 4);
> ++
> ++ prg.filter[FILTER_HSR_GENERAL_SRC0].k =
> ++ ntohs(prg.filter[FILTER_HSR_GENERAL_SRC0].k);
> ++ prg.filter[FILTER_HSR_GENERAL_SRC2].k =
> ++ ntohl(prg.filter[FILTER_HSR_GENERAL_SRC2].k);
> ++ }
> + } else {
> +- prg.len = ARRAY_SIZE(raw_filter_vlan_norm_general);
> +- prg.filter = raw_filter_vlan_norm_general;
> +-
> +- memcpy(&prg.filter[FILTER_GENERAL_POS_SRC0].k, local_addr, 2);
> +- memcpy(&prg.filter[FILTER_GENERAL_POS_SRC2].k, local_addr + 2,
> 4);
> +- prg.filter[FILTER_GENERAL_POS_SRC0].k =
> +- ntohs(prg.filter[FILTER_GENERAL_POS_SRC0].k);
> +- prg.filter[FILTER_GENERAL_POS_SRC2].k =
> +- ntohl(prg.filter[FILTER_GENERAL_POS_SRC2].k);
> ++ if (event) {
> ++ prg.len = ARRAY_SIZE(raw_filter_vlan_norm_event);
> ++ prg.filter = raw_filter_vlan_norm_event;
> ++
> ++ memcpy(&prg.filter[FILTER_EVENT_POS_SRC0].k,
> local_addr, 2);
> ++ memcpy(&prg.filter[FILTER_EVENT_POS_SRC2].k, local_addr
> + 2, 4);
> ++ prg.filter[FILTER_EVENT_POS_SRC0].k =
> ++ ntohs(prg.filter[FILTER_EVENT_POS_SRC0].k);
> ++ prg.filter[FILTER_EVENT_POS_SRC2].k =
> ++ ntohl(prg.filter[FILTER_EVENT_POS_SRC2].k);
> ++ } else {
> ++ prg.len = ARRAY_SIZE(raw_filter_vlan_norm_general);
> ++ prg.filter = raw_filter_vlan_norm_general;
> ++
> ++ memcpy(&prg.filter[FILTER_GENERAL_POS_SRC0].k,
> local_addr, 2);
> ++ memcpy(&prg.filter[FILTER_GENERAL_POS_SRC2].k,
> local_addr + 2, 4);
> ++ prg.filter[FILTER_GENERAL_POS_SRC0].k =
> ++ ntohs(prg.filter[FILTER_GENERAL_POS_SRC0].k);
> ++ prg.filter[FILTER_GENERAL_POS_SRC2].k =
> ++ ntohl(prg.filter[FILTER_GENERAL_POS_SRC2].k);
> ++
> ++ }
> + }
> +
> + if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &prg, sizeof(prg))) {
> +@@ -236,7 +341,7 @@ static int raw_close(struct transport *t, struct fdarray
> *fda)
> +
> + static int open_socket(const char *name, int event, unsigned char
> *local_addr,
> + unsigned char *ptp_dst_mac, unsigned char *p2p_dst_mac,
> +- int socket_priority)
> ++ int socket_priority, int hsr_slave)
> + {
> + struct sockaddr_ll addr;
> + int fd, index;
> +@@ -256,8 +361,22 @@ static int open_socket(const char *name, int event,
> unsigned char *local_addr,
> + pr_err("setsockopt SO_PRIORITY failed: %m");
> + goto no_option;
> + }
> ++ if (hsr_slave) {
> ++ int option;
> ++
> ++ if (hsr_slave == 1)
> ++ option = PACKET_HSR_BIND_PORT_A;
> ++ else
> ++ option = PACKET_HSR_BIND_PORT_B;
> ++
> ++ if (setsockopt(fd, SOL_PACKET, PACKET_HSR_BIND_PORT, &option,
> ++ sizeof(option))) {
> ++ pr_err("setsockopt(SOL_PACKET, PACKET_HSR_BIND_PORT)
> failed: %m");
> ++ goto no_option;
> ++ }
> ++ }
> + if (raw_configure(fd, event, index, local_addr, ptp_dst_mac,
> +- p2p_dst_mac, 1))
> ++ p2p_dst_mac, 1, hsr_slave))
> + goto no_option;
> +
> + memset(&addr, 0, sizeof(addr));
> +@@ -352,7 +471,7 @@ static int raw_open(struct transport *t, struct
> interface *iface,
> + unsigned char ptp_dst_mac[MAC_LEN];
> + unsigned char p2p_dst_mac[MAC_LEN];
> + int efd, gfd, socket_priority;
> +- const char *name;
> ++ const char *name, *hsr_device;
> + char *str;
> +
> + name = interface_label(iface);
> +@@ -369,18 +488,45 @@ static int raw_open(struct transport *t, struct
> interface *iface,
> + mac_to_addr(&raw->ptp_addr, ptp_dst_mac);
> + mac_to_addr(&raw->p2p_addr, p2p_dst_mac);
> +
> ++ hsr_device = config_get_string(t->cfg, name, "hsr_device");
> ++ if (!strlen(hsr_device))
> ++ hsr_device = NULL;
> ++ if (hsr_device) {
> ++ char hsr_slave_A[IF_NAMESIZE];
> ++ char hsr_slave_B[IF_NAMESIZE];
> ++ int ret;
> ++
> ++ ret = rtnl_get_hsr_devices(hsr_device, hsr_slave_A,
> hsr_slave_B);
> ++ if (ret < 0) {
> ++ pr_err("Failed to query hsr device %s", hsr_device);
> ++ goto no_mac;
> ++ }
> ++ if (!strcmp(name, hsr_slave_A)) {
> ++ raw->hsr_slave = 1;
> ++ } else if (!strcmp(name, hsr_slave_B)) {
> ++ raw->hsr_slave = 2;
> ++ } else {
> ++ pr_err("HSR device %s has no slave %s", hsr_device,
> name);
> ++ goto no_mac;
> ++ }
> ++
> ++ pr_notice("raw: HSR interface %s/%s, port %c",
> ++ hsr_device, name,
> ++ raw->hsr_slave == 1 ? 'A' : 'B');
> ++ }
> ++
> + if (sk_interface_macaddr(name, &raw->src_addr))
> + goto no_mac;
> +
> + socket_priority = config_get_int(t->cfg, "global", "socket_priority");
> +
> +- efd = open_socket(name, 1, raw->src_addr.sll.sll_addr, ptp_dst_mac,
> +- p2p_dst_mac, socket_priority);
> ++ efd = open_socket(hsr_device ?: name, 1, raw->src_addr.sll.sll_addr,
> ptp_dst_mac,
> ++ p2p_dst_mac, socket_priority, raw->hsr_slave);
> + if (efd < 0)
> + goto no_event;
> +
> +- gfd = open_socket(name, 0, raw->src_addr.sll.sll_addr, p2p_dst_mac,
> +- p2p_dst_mac, socket_priority);
> ++ gfd = open_socket(hsr_device ?: name, 0, raw->src_addr.sll.sll_addr,
> p2p_dst_mac,
> ++ p2p_dst_mac, socket_priority, raw->hsr_slave);
> + if (gfd < 0)
> + goto no_general;
> +
> +@@ -412,7 +558,9 @@ static int raw_recv(struct transport *t, int fd, void
> *buf, int buflen,
> + struct eth_hdr *hdr;
> + int cnt, hlen;
> +
> +- if (raw->vlan) {
> ++ if (raw->hsr_slave) {
> ++ hlen = sizeof(struct hsr_hdr);
> ++ } else if (raw->vlan) {
> + hlen = sizeof(struct vlan_hdr);
> + } else {
> + hlen = sizeof(struct eth_hdr);
> +@@ -431,7 +579,21 @@ static int raw_recv(struct transport *t, int fd, void
> *buf, int buflen,
> + if (has_prp_trailer(buf, cnt))
> + cnt -= PRP_TRAILER_LEN;
> +
> +- if (raw->vlan) {
> ++ if (raw->hsr_slave) {
> ++ struct hsr_hdr *hsr_hdr = (struct hsr_hdr *) ptr;
> ++ struct ptp_message *m = buf;
> ++ unsigned int hsr_size;
> ++
> ++ hsr_size = ntohs(hsr_hdr->pathid_and_LSDU_size) & 0xfff;
> ++ if (hsr_size != cnt + 6) {
> ++ pr_notice("Dropping bad sized HSR packet (%d vs %d)",
> hsr_size, cnt);
> ++ return 0;
> ++ }
> ++
> ++ memcpy(&m->hsr_header, hsr_hdr, sizeof(struct hsr_hdr));
> ++ m->hsr_header_valid = 1;
> ++
> ++ } else if (raw->vlan) {
> + if (ETH_P_1588 == ntohs(hdr->type)) {
> + pr_notice("raw: disabling VLAN mode");
> + raw->vlan = 0;
> +@@ -445,14 +607,37 @@ static int raw_recv(struct transport *t, int fd, void
> *buf, int buflen,
> + return cnt;
> + }
> +
> ++static unsigned int put_cmsg(struct msghdr *msg, unsigned int msg_off, int
> ctrl_tot,
> ++ int level, int type, int len, void *data)
> ++{
> ++ struct cmsghdr *cm;
> ++ int cmlen = CMSG_LEN(len);
> ++
> ++ if (msg->msg_controllen + cmlen >= ctrl_tot)
> ++ return 0;
> ++
> ++ cm = msg->msg_control + msg_off;
> ++ cm->cmsg_level = level;
> ++ cm->cmsg_type = type;
> ++ cm->cmsg_len = cmlen;
> ++
> ++ memcpy(CMSG_DATA(cm), data, cmlen - sizeof(*cm));
> ++ cmlen = CMSG_SPACE(len);
> ++ if (cmlen > ctrl_tot - msg_off)
> ++ cmlen = ctrl_tot - msg_off;
> ++
> ++ msg->msg_controllen += cmlen;
> ++ return msg_off + cmlen;
> ++}
> ++
> + static int raw_send(struct transport *t, struct fdarray *fda,
> + enum transport_event event, int peer, void *buf, int len,
> + struct address *addr, struct hw_timestamp *hwts)
> + {
> + struct raw *raw = container_of(t, struct raw, t);
> ++ struct ptp_message *m = buf;
> + ssize_t cnt;
> + unsigned char pkt[1600], *ptr = buf;
> +- struct eth_hdr *hdr;
> + int fd = -1;
> +
> + switch (event) {
> +@@ -467,22 +652,67 @@ static int raw_send(struct transport *t, struct
> fdarray *fda,
> + break;
> + }
> +
> +- ptr -= sizeof(*hdr);
> +- len += sizeof(*hdr);
> ++ if (raw->hsr_slave && m->hsr_header_valid) {
> ++ struct hsr_hdr *hdr;
> ++ unsigned int pathid;
> ++ struct msghdr msg;
> ++ char control[256];
> ++ struct iovec iov = { ptr, len };
> ++ unsigned int hsr_option;
> +
> +- if (!addr)
> +- addr = peer ? &raw->p2p_addr : &raw->ptp_addr;
> ++ ptr -= sizeof(*hdr);
> ++ len += sizeof(*hdr);
> +
> +- hdr = (struct eth_hdr *) ptr;
> +- addr_to_mac(&hdr->dst, addr);
> +- addr_to_mac(&hdr->src, &raw->src_addr);
> ++ hdr = (struct hsr_hdr *)ptr;
> ++ memcpy(hdr, &m->hsr_header, sizeof(struct hsr_hdr));
> ++
> ++ /*
> ++ * The sender might have used a larger padding than neccessary.
> ++ * Sending a smaller packet requires to update the HSR header.
> ++ */
> ++ pathid = ntohs(hdr->pathid_and_LSDU_size) & ~0x0fff;
> ++ hdr->pathid_and_LSDU_size = htons((len - sizeof(struct
> eth_hdr)) | pathid);
> ++
> ++ iov.iov_base = ptr;
> ++ iov.iov_len = len;
> +
> +- hdr->type = htons(ETH_P_1588);
> ++ memset(control, 0, sizeof(control));
> ++ memset(&msg, 0, sizeof(msg));
> +
> +- cnt = send(fd, ptr, len, 0);
> +- if (cnt < 1) {
> +- return -errno;
> ++ msg.msg_iov = &iov;
> ++ msg.msg_iovlen = 1;
> ++ msg.msg_control = control;
> ++
> ++ hsr_option = PACKET_HSR_INFO_HAS_HDR;
> ++
> ++ put_cmsg(&msg, 0, sizeof(control), SOL_PACKET, PACKET_HSR_INFO,
> ++ sizeof(hsr_option), &hsr_option);
> ++
> ++ cnt = sendmsg(fd, &msg, 0);
> ++ if (cnt < 1) {
> ++ return -errno;
> ++ }
> ++ } else {
> ++ struct eth_hdr *hdr;
> ++
> ++ ptr -= sizeof(*hdr);
> ++ len += sizeof(*hdr);
> ++
> ++ if (!addr)
> ++ addr = peer ? &raw->p2p_addr : &raw->ptp_addr;
> ++
> ++ hdr = (struct eth_hdr *) ptr;
> ++ addr_to_mac(&hdr->dst, addr);
> ++ addr_to_mac(&hdr->src, &raw->src_addr);
> ++
> ++ hdr->type = htons(ETH_P_1588);
> ++
> ++ cnt = send(fd, ptr, len, 0);
> ++ if (cnt < 1) {
> ++ return -errno;
> ++ }
> + }
> ++
> + /*
> + * Get the time stamp right away.
> + */
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0012-configs-Add-sample-configs-for-the-HSR-setup.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0012-configs-Add-sample-configs-for-the-HSR-setup.patch
> new file mode 100644
> index 00000000..69833bdd
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0012-configs-Add-sample-configs-for-the-HSR-setup.patch
> @@ -0,0 +1,96 @@
> +From 65df5cc751c253ff08ecb14d03c59d8e8882f9d6 Mon Sep 17 00:00:00 2001
> +From: Sebastian Andrzej Siewior <[email protected]>
> +Date: Thu, 2 Oct 2025 11:51:53 +0200
> +Subject: [PATCH 12/13] configs: Add sample configs for the HSR setup
> +
> +This is a sample config for the HSR/ DAC mode.
> +
> +Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Submitted
> + Submitted to upstream, waiting approval
> + https://lists.nwtime.org/sympa/arc/linuxptp-devel/2025-11/msg00017.html
> +
> + configs/hsr-master.cfg | 30 ++++++++++++++++++++++++++++++
> + configs/hsr-slave.cfg | 30 ++++++++++++++++++++++++++++++
> + 2 files changed, 60 insertions(+)
> + create mode 100644 configs/hsr-master.cfg
> + create mode 100644 configs/hsr-slave.cfg
> +
> +diff --git a/configs/hsr-master.cfg b/configs/hsr-master.cfg
> +new file mode 100644
> +index 0000000..477b3a2
> +--- /dev/null
> ++++ b/configs/hsr-master.cfg
> +@@ -0,0 +1,30 @@
> ++# HSR example. Two redundant ports, paired. The interfaces implement a HC
> ++# consisting of two TC and attached OC for internal synchronisation. Both
> ++# ports should use the PTP-clock.
> ++# Can become master.
> ++# See the file, default.cfg, for the complete list of available options.
> ++
> ++[global]
> ++clientOnly 0
> ++priority1 127
> ++priority2 128
> ++logAnnounceInterval 0
> ++logSyncInterval 0
> ++path_trace_enabled 1
> ++tc_spanning_tree 1
> ++network_transport L2
> ++delay_mechanism P2P
> ++
> ++profileIdentity 00:0c:cd:01:01:01
> ++dataset_comparison IEC62439-3
> ++use_syslog 0
> ++verbose 1
> ++logging_level 6
> ++
> ++[eth1]
> ++hsr_device hsr0
> ++BMCA redundant_master
> ++
> ++[eth2]
> ++hsr_device hsr0
> ++BMCA redundant_master
> +diff --git a/configs/hsr-slave.cfg b/configs/hsr-slave.cfg
> +new file mode 100644
> +index 0000000..4531011
> +--- /dev/null
> ++++ b/configs/hsr-slave.cfg
> +@@ -0,0 +1,30 @@
> ++# HSR example. Two redundant ports, paired. The interfaces implement a HC
> ++# consisting of two TC and attached OC for internal synchronisation. Both
> ++# ports should use the PTP-clock.
> ++# Slave only mode.
> ++# See the file, default.cfg, for the complete list of available options.
> ++
> ++[global]
> ++clientOnly 1
> ++priority1 255
> ++priority2 255
> ++logAnnounceInterval 0
> ++logSyncInterval 0
> ++path_trace_enabled 1
> ++tc_spanning_tree 1
> ++network_transport L2
> ++delay_mechanism P2P
> ++
> ++profileIdentity 00:0c:cd:01:01:01
> ++dataset_comparison IEC62439-3
> ++use_syslog 0
> ++verbose 1
> ++logging_level 6
> ++
> ++[eth1]
> ++hsr_device hsr0
> ++BMCA redundant_master
> ++
> ++[eth2]
> ++hsr_device hsr0
> ++BMCA redundant_master
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0013-configs-Change-p2p_dst_mac-to-avoid-IEEE-802.1-reser.patch
>
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0013-configs-Change-p2p_dst_mac-to-avoid-IEEE-802.1-reser.patch
> new file mode 100644
> index 00000000..928eb11e
> --- /dev/null
> +++
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp/0013-configs-Change-p2p_dst_mac-to-avoid-IEEE-802.1-reser.patch
> @@ -0,0 +1,47 @@
> +From 53546f24b647adb969316f082652004a67ab50c8 Mon Sep 17 00:00:00 2001
> +From: MD Danish Anwar <[email protected]>
> +Date: Wed, 18 Feb 2026 15:45:27 +0530
> +Subject: [PATCH 13/13] configs: Change p2p_dst_mac to avoid IEEE 802.1
> + reserved range
> +
> +The default p2p_dst_mac (01:80:C2:00:00:0E) is in the IEEE 802.1 reserved
> +range which can cause issues with switches and HSR handling. Change it to
> +01:1B:19:00:00:01 which is in the PTP multicast address range.
> +
> +Signed-off-by: MD Danish Anwar <[email protected]>
> +---
> +Upstream-Status:
> +Pending
> + To be posted once Patch 1-12 gets integrated
> +
> + configs/hsr-master.cfg | 1 +
> + configs/hsr-slave.cfg | 1 +
> + 2 files changed, 2 insertions(+)
> +
> +diff --git a/configs/hsr-master.cfg b/configs/hsr-master.cfg
> +index 477b3a2..6ac8f76 100644
> +--- a/configs/hsr-master.cfg
> ++++ b/configs/hsr-master.cfg
> +@@ -14,6 +14,7 @@ path_trace_enabled 1
> + tc_spanning_tree 1
> + network_transport L2
> + delay_mechanism P2P
> ++p2p_dst_mac 01:1B:19:00:00:01
> +
> + profileIdentity 00:0c:cd:01:01:01
> + dataset_comparison IEC62439-3
> +diff --git a/configs/hsr-slave.cfg b/configs/hsr-slave.cfg
> +index 4531011..94ce948 100644
> +--- a/configs/hsr-slave.cfg
> ++++ b/configs/hsr-slave.cfg
> +@@ -14,6 +14,7 @@ path_trace_enabled 1
> + tc_spanning_tree 1
> + network_transport L2
> + delay_mechanism P2P
> ++p2p_dst_mac 01:1B:19:00:00:01
> +
> + profileIdentity 00:0c:cd:01:01:01
> + dataset_comparison IEC62439-3
> +--
> +2.34.1
> +
> diff --git
> a/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp_%.bbappend
> b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp_%.bbappend
> new file mode 100644
> index 00000000..09958c5a
> --- /dev/null
> +++ b/meta-arago-distro/recipes-connectivity/linuxptp/linuxptp_%.bbappend
> @@ -0,0 +1,4 @@
> +LINUXPTP_ARAGO = ""
> +LINUXPTP_ARAGO:arago = "linuxptp-arago.inc"
> +
> +require ${LINUXPTP_ARAGO}
>
> base-commit: 3230bc79957bd71775e0273ea1f4eab8d676123a
> --
> 2.34.1
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