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86db36a347
Tested using the following bash script and the tc from iproute2-next:
#!/bin/bash
set -e -u -o pipefail
NSEC_PER_SEC="1000000000"
gatemask() {
local tc_list="$1"
local mask=0
for tc in ${tc_list}; do
mask=$((${mask} | (1 << ${tc})))
done
printf "%02x" ${mask}
}
if ! systemctl is-active --quiet ptp4l; then
echo "Please start the ptp4l service"
exit
fi
now=$(phc_ctl /dev/ptp1 get | gawk '/clock time is/ { print $5; }')
# Phase-align the base time to the start of the next second.
sec=$(echo "${now}" | gawk -F. '{ print $1; }')
base_time="$(((${sec} + 1) * ${NSEC_PER_SEC}))"
tc qdisc add dev swp5 parent root handle 100 taprio \
num_tc 8 \
map 0 1 2 3 5 6 7 \
queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 \
base-time ${base_time} \
sched-entry S $(gatemask 7) 100000 \
sched-entry S $(gatemask "0 1 2 3 4 5 6") 400000 \
clockid CLOCK_TAI flags 2
The "state machine" is a workqueue invoked after each manipulation
command on the PTP clock (reset, adjust time, set time, adjust
frequency) which checks over the state of the time-aware scheduler.
So it is not monitored periodically, only in reaction to a PTP command
typically triggered from a userspace daemon (linuxptp). Otherwise there
is no reason for things to go wrong.
Now that the timecounter/cyclecounter has been replaced with hardware
operations on the PTP clock, the TAS Kconfig now depends upon PTP and
the standalone clocksource operating mode has been removed.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
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*/
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#ifndef _SJA1105_TAS_H
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#define _SJA1105_TAS_H
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#include <net/pkt_sched.h>
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#if IS_ENABLED(CONFIG_NET_DSA_SJA1105_TAS)
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enum sja1105_tas_state {
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SJA1105_TAS_STATE_DISABLED,
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SJA1105_TAS_STATE_ENABLED_NOT_RUNNING,
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SJA1105_TAS_STATE_RUNNING,
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};
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enum sja1105_ptp_op {
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SJA1105_PTP_NONE,
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SJA1105_PTP_CLOCKSTEP,
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SJA1105_PTP_ADJUSTFREQ,
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};
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struct sja1105_tas_data {
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struct tc_taprio_qopt_offload *offload[SJA1105_NUM_PORTS];
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enum sja1105_tas_state state;
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enum sja1105_ptp_op last_op;
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struct work_struct tas_work;
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s64 earliest_base_time;
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s64 oper_base_time;
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u64 max_cycle_time;
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bool enabled;
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};
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int sja1105_setup_tc_taprio(struct dsa_switch *ds, int port,
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struct tc_taprio_qopt_offload *admin);
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void sja1105_tas_setup(struct dsa_switch *ds);
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void sja1105_tas_teardown(struct dsa_switch *ds);
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void sja1105_tas_clockstep(struct dsa_switch *ds);
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void sja1105_tas_adjfreq(struct dsa_switch *ds);
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#else
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/* C doesn't allow empty structures, bah! */
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struct sja1105_tas_data {
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u8 dummy;
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};
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static inline int sja1105_setup_tc_taprio(struct dsa_switch *ds, int port,
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struct tc_taprio_qopt_offload *admin)
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{
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return -EOPNOTSUPP;
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}
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static inline void sja1105_tas_setup(struct dsa_switch *ds) { }
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static inline void sja1105_tas_teardown(struct dsa_switch *ds) { }
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static inline void sja1105_tas_clockstep(struct dsa_switch *ds) { }
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static inline void sja1105_tas_adjfreq(struct dsa_switch *ds) { }
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#endif /* IS_ENABLED(CONFIG_NET_DSA_SJA1105_TAS) */
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#endif /* _SJA1105_TAS_H */
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