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net: dsa: felix: update base time of time-aware shaper when adjusting PTP time

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When adjusting the PTP clock, the base time of the TAS configuration
will become unreliable. We need reset the TAS configuration by using a
new base time.

For example, if the driver gets a base time 0 of Qbv configuration from
user, and current time is 20000. The driver will set the TAS base time
to be 20000. After the PTP clock adjustment, the current time becomes
10000. If the TAS base time is still 20000, it will be a future time,
and TAS entry list will stop running. Another example, if the current
time becomes to be 10000000 after PTP clock adjust, a large time offset
can cause the hardware to hang.

This patch introduces a tas_clock_adjust() function to reset the TAS
module by using a new base time after the PTP clock adjustment. This can
avoid issues above.

Due to PTP clock adjustment can occur at any time, it may conflict with
the TAS configuration. We introduce a new TAS lock to serialize the
access to the TAS registers.

Signed-off-by: Xiaoliang Yang <xiaoliang.yang_1@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xiaoliang Yang 2022-06-17 11:24:23 +08:00 • committed by David S. Miller
parent c205035e3a
commit 8670dc33f4
4 changed files with 93 additions and 6 deletions
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7
include/soc/mscc/ocelot.h
View file

@ -575,6 +575,7 @@ struct ocelot_ops {
int (*psfp_stats_get)(struct ocelot *ocelot, struct flow_cls_offload *f,
struct flow_stats *stats);
void (*cut_through_fwd)(struct ocelot *ocelot);
void (*tas_clock_adjust)(struct ocelot *ocelot);
};
struct ocelot_vcap_policer {
@ -691,6 +692,9 @@ struct ocelot_port {
int bridge_num;
int speed;
/* Store the AdminBaseTime of EST fetched from userspace. */
s64 base_time;
};
struct ocelot {
@ -757,6 +761,9 @@ struct ocelot {
/* Lock for serializing forwarding domain changes */
struct mutex fwd_domain_lock;
/* Lock for serializing Time-Aware Shaper changes */
struct mutex tas_lock;
struct workqueue_struct *owq;
u8 ptp:1;