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authorXiaoliang Yang <xiaoliang.yang_1@nxp.com>2022-06-17 06:24:23 +0300
committerDavid S. Miller <davem@davemloft.net>2022-06-19 11:53:59 +0300
commit8670dc33f48bab4d7bb4b8d0232f17f4dae419ec (patch)
treeee153e88e10b3e41b0ace1474dd4e427597f66f1
parentc205035e3adb4c50234c9263f7cf3bbff76b3c72 (diff)
downloadlinux-8670dc33f48bab4d7bb4b8d0232f17f4dae419ec.tar.xz
net: dsa: felix: update base time of time-aware shaper when adjusting PTP time
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>
-rw-r--r--drivers/net/dsa/ocelot/felix_vsc9959.c83
-rw-r--r--drivers/net/ethernet/mscc/ocelot.c1
-rw-r--r--drivers/net/ethernet/mscc/ocelot_ptp.c8
-rw-r--r--include/soc/mscc/ocelot.h7
4 files changed, 93 insertions, 6 deletions
diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index 570d0204b7be..dd9085ae0922 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -1196,10 +1196,13 @@ static void vsc9959_tas_gcl_set(struct ocelot *ocelot, const u32 gcl_ix,
static int vsc9959_qos_port_tas_set(struct ocelot *ocelot, int port,
struct tc_taprio_qopt_offload *taprio)
{
+ struct ocelot_port *ocelot_port = ocelot->ports[port];
struct timespec64 base_ts;
int ret, i;
u32 val;
+ mutex_lock(&ocelot->tas_lock);
+
if (!taprio->enable) {
ocelot_rmw_rix(ocelot,
QSYS_TAG_CONFIG_INIT_GATE_STATE(0xFF),
@@ -1207,15 +1210,20 @@ static int vsc9959_qos_port_tas_set(struct ocelot *ocelot, int port,
QSYS_TAG_CONFIG_INIT_GATE_STATE_M,
QSYS_TAG_CONFIG, port);
+ mutex_unlock(&ocelot->tas_lock);
return 0;
}
if (taprio->cycle_time > NSEC_PER_SEC ||
- taprio->cycle_time_extension >= NSEC_PER_SEC)
- return -EINVAL;
+ taprio->cycle_time_extension >= NSEC_PER_SEC) {
+ ret = -EINVAL;
+ goto err;
+ }
- if (taprio->num_entries > VSC9959_TAS_GCL_ENTRY_MAX)
- return -ERANGE;
+ if (taprio->num_entries > VSC9959_TAS_GCL_ENTRY_MAX) {
+ ret = -ERANGE;
+ goto err;
+ }
/* Enable guard band. The switch will schedule frames without taking
* their length into account. Thus we'll always need to enable the
@@ -1236,8 +1244,10 @@ static int vsc9959_qos_port_tas_set(struct ocelot *ocelot, int port,
* config is pending, need reset the TAS module
*/
val = ocelot_read(ocelot, QSYS_PARAM_STATUS_REG_8);
- if (val & QSYS_PARAM_STATUS_REG_8_CONFIG_PENDING)
- return -EBUSY;
+ if (val & QSYS_PARAM_STATUS_REG_8_CONFIG_PENDING) {
+ ret = -EBUSY;
+ goto err;
+ }
ocelot_rmw_rix(ocelot,
QSYS_TAG_CONFIG_ENABLE |
@@ -1248,6 +1258,8 @@ static int vsc9959_qos_port_tas_set(struct ocelot *ocelot, int port,
QSYS_TAG_CONFIG_SCH_TRAFFIC_QUEUES_M,
QSYS_TAG_CONFIG, port);
+ ocelot_port->base_time = taprio->base_time;
+
vsc9959_new_base_time(ocelot, taprio->base_time,
taprio->cycle_time, &base_ts);
ocelot_write(ocelot, base_ts.tv_nsec, QSYS_PARAM_CFG_REG_1);
@@ -1271,9 +1283,67 @@ static int vsc9959_qos_port_tas_set(struct ocelot *ocelot, int port,
!(val & QSYS_TAS_PARAM_CFG_CTRL_CONFIG_CHANGE),
10, 100000);
+err:
+ mutex_unlock(&ocelot->tas_lock);
+
return ret;
}
+static void vsc9959_tas_clock_adjust(struct ocelot *ocelot)
+{
+ struct ocelot_port *ocelot_port;
+ struct timespec64 base_ts;
+ u64 cycletime;
+ int port;
+ u32 val;
+
+ mutex_lock(&ocelot->tas_lock);
+
+ for (port = 0; port < ocelot->num_phys_ports; port++) {
+ val = ocelot_read_rix(ocelot, QSYS_TAG_CONFIG, port);
+ if (!(val & QSYS_TAG_CONFIG_ENABLE))
+ continue;
+
+ ocelot_rmw(ocelot,
+ QSYS_TAS_PARAM_CFG_CTRL_PORT_NUM(port),
+ QSYS_TAS_PARAM_CFG_CTRL_PORT_NUM_M,
+ QSYS_TAS_PARAM_CFG_CTRL);
+
+ ocelot_rmw_rix(ocelot,
+ QSYS_TAG_CONFIG_INIT_GATE_STATE(0xFF),
+ QSYS_TAG_CONFIG_ENABLE |
+ QSYS_TAG_CONFIG_INIT_GATE_STATE_M,
+ QSYS_TAG_CONFIG, port);
+
+ cycletime = ocelot_read(ocelot, QSYS_PARAM_CFG_REG_4);
+ ocelot_port = ocelot->ports[port];
+
+ vsc9959_new_base_time(ocelot, ocelot_port->base_time,
+ cycletime, &base_ts);
+
+ ocelot_write(ocelot, base_ts.tv_nsec, QSYS_PARAM_CFG_REG_1);
+ ocelot_write(ocelot, lower_32_bits(base_ts.tv_sec),
+ QSYS_PARAM_CFG_REG_2);
+ val = upper_32_bits(base_ts.tv_sec);
+ ocelot_rmw(ocelot,
+ QSYS_PARAM_CFG_REG_3_BASE_TIME_SEC_MSB(val),
+ QSYS_PARAM_CFG_REG_3_BASE_TIME_SEC_MSB_M,
+ QSYS_PARAM_CFG_REG_3);
+
+ ocelot_rmw(ocelot, QSYS_TAS_PARAM_CFG_CTRL_CONFIG_CHANGE,
+ QSYS_TAS_PARAM_CFG_CTRL_CONFIG_CHANGE,
+ QSYS_TAS_PARAM_CFG_CTRL);
+
+ ocelot_rmw_rix(ocelot,
+ QSYS_TAG_CONFIG_INIT_GATE_STATE(0xFF) |
+ QSYS_TAG_CONFIG_ENABLE,
+ QSYS_TAG_CONFIG_ENABLE |
+ QSYS_TAG_CONFIG_INIT_GATE_STATE_M,
+ QSYS_TAG_CONFIG, port);
+ }
+ mutex_unlock(&ocelot->tas_lock);
+}
+
static int vsc9959_qos_port_cbs_set(struct dsa_switch *ds, int port,
struct tc_cbs_qopt_offload *cbs_qopt)
{
@@ -2210,6 +2280,7 @@ static const struct ocelot_ops vsc9959_ops = {
.psfp_filter_del = vsc9959_psfp_filter_del,
.psfp_stats_get = vsc9959_psfp_stats_get,
.cut_through_fwd = vsc9959_cut_through_fwd,
+ .tas_clock_adjust = vsc9959_tas_clock_adjust,
};
static const struct felix_info felix_info_vsc9959 = {
diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 8da7e25a47c9..d4649e4ee0e7 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -3367,6 +3367,7 @@ int ocelot_init(struct ocelot *ocelot)
mutex_init(&ocelot->ptp_lock);
mutex_init(&ocelot->mact_lock);
mutex_init(&ocelot->fwd_domain_lock);
+ mutex_init(&ocelot->tas_lock);
spin_lock_init(&ocelot->ptp_clock_lock);
spin_lock_init(&ocelot->ts_id_lock);
snprintf(queue_name, sizeof(queue_name), "%s-stats",
diff --git a/drivers/net/ethernet/mscc/ocelot_ptp.c b/drivers/net/ethernet/mscc/ocelot_ptp.c
index 87ad2137ba06..09c703efe946 100644
--- a/drivers/net/ethernet/mscc/ocelot_ptp.c
+++ b/drivers/net/ethernet/mscc/ocelot_ptp.c
@@ -72,6 +72,10 @@ int ocelot_ptp_settime64(struct ptp_clock_info *ptp,
ocelot_write_rix(ocelot, val, PTP_PIN_CFG, TOD_ACC_PIN);
spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
+
+ if (ocelot->ops->tas_clock_adjust)
+ ocelot->ops->tas_clock_adjust(ocelot);
+
return 0;
}
EXPORT_SYMBOL(ocelot_ptp_settime64);
@@ -105,6 +109,9 @@ int ocelot_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
ocelot_write_rix(ocelot, val, PTP_PIN_CFG, TOD_ACC_PIN);
spin_unlock_irqrestore(&ocelot->ptp_clock_lock, flags);
+
+ if (ocelot->ops->tas_clock_adjust)
+ ocelot->ops->tas_clock_adjust(ocelot);
} else {
/* Fall back using ocelot_ptp_settime64 which is not exact. */
struct timespec64 ts;
@@ -117,6 +124,7 @@ int ocelot_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
ocelot_ptp_settime64(ptp, &ts);
}
+
return 0;
}
EXPORT_SYMBOL(ocelot_ptp_adjtime);
diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index 5f88385a7748..3737570116c3 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -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;