[Intel-wired-lan] [PATCH net-next v2] igc: Add qbv_config_change_errors counter

[Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>]

Add ConfigChangeError(qbv_config_change_errors) when user try to set the
AdminBaseTime to past value while the current GCL is still running.

The ConfigChangeError counter should not be increased when a gate control
list is scheduled into the future.

User can use "ethtool -S <interface> | grep qbv_config_change_errors"
command to check the counter values.

Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>

---
V1 -> V2: Fix wrong tree applied
---
---
 drivers/net/ethernet/intel/igc/igc.h         | 1 +
 drivers/net/ethernet/intel/igc/igc_ethtool.c | 1 +
 drivers/net/ethernet/intel/igc/igc_main.c    | 1 +
 drivers/net/ethernet/intel/igc/igc_tsn.c     | 6 ++++++
 4 files changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h
index 5da8d162cd38..9db93c1f9767 100644
--- a/drivers/net/ethernet/intel/igc/igc.h
+++ b/drivers/net/ethernet/intel/igc/igc.h
@@ -185,6 +185,7 @@ struct igc_adapter {
 	ktime_t base_time;
 	ktime_t cycle_time;
 	bool qbv_enable;
+	u32 qbv_config_change_errors;
 
 	/* OS defined structs */
 	struct pci_dev *pdev;
diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index 5a26a7805ef8..0e2cb00622d1 100644
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -67,6 +67,7 @@ static const struct igc_stats igc_gstrings_stats[] = {
 	IGC_STAT("rx_hwtstamp_cleared", rx_hwtstamp_cleared),
 	IGC_STAT("tx_lpi_counter", stats.tlpic),
 	IGC_STAT("rx_lpi_counter", stats.rlpic),
+	IGC_STAT("qbv_config_change_errors", qbv_config_change_errors),
 };
 
 #define IGC_NETDEV_STAT(_net_stat) { \
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index fdb7f0b26ed0..4947b0f308cd 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -6012,6 +6012,7 @@ static int igc_tsn_clear_schedule(struct igc_adapter *adapter)
 
 	adapter->base_time = 0;
 	adapter->cycle_time = NSEC_PER_SEC;
+	adapter->qbv_config_change_errors = 0;
 
 	for (i = 0; i < adapter->num_tx_queues; i++) {
 		struct igc_ring *ring = adapter->tx_ring[i];
diff --git a/drivers/net/ethernet/intel/igc/igc_tsn.c b/drivers/net/ethernet/intel/igc/igc_tsn.c
index b03c6168bd23..a6b963839741 100644
--- a/drivers/net/ethernet/intel/igc/igc_tsn.c
+++ b/drivers/net/ethernet/intel/igc/igc_tsn.c
@@ -239,6 +239,12 @@ static int igc_tsn_enable_offload(struct igc_adapter *adapter)
 		s64 n = div64_s64(ktime_sub_ns(systim, base_time), cycle);
 
 		base_time = ktime_add_ns(base_time, (n + 1) * cycle);
+
+		/* Increase the counter if scheduling into the past while
+		 * Gate Control List (GCL) is running.
+		 */
+		if (rd32(IGC_BASET_H) || rd32(IGC_BASET_L))
+			adapter->qbv_config_change_errors++;
 	} else {
 		/* According to datasheet section 7.5.2.9.3.3, FutScdDis bit
 		 * has to be configured before the cycle time and base time.
-- 
2.17.1

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