netdev - [PATCH net-next 5/8] igc: enable Qbv configuration for 2nd GCL

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Date:   Mon,  5 Dec 2022 13:24:11 -0800
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com
Cc:     Tan Tee Min <tee.min.tan@...ux.intel.com>, netdev@...r.kernel.org,
        anthony.l.nguyen@...el.com, sasha.neftin@...el.com,
        Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>,
        Naama Meir <naamax.meir@...ux.intel.com>
Subject: [PATCH net-next 5/8] igc: enable Qbv configuration for 2nd GCL

From: Tan Tee Min <tee.min.tan@...ux.intel.com>

Make reset task only executes for i225 and Qbv disabling to allow
i226 configure for 2nd GCL without resetting the adapter.

In i226, Tx won't hang if there is a GCL is already running, so in
this case we don't need to set FutScdDis bit.

Signed-off-by: Tan Tee Min <tee.min.tan@...ux.intel.com>
Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>
Tested-by: Naama Meir <naamax.meir@...ux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c |  9 +++++----
 drivers/net/ethernet/intel/igc/igc_tsn.c  | 13 +++++++++----
 drivers/net/ethernet/intel/igc/igc_tsn.h  |  2 +-
 3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 5aa72eac2a35..480b814dc18c 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -5902,7 +5902,7 @@ static int igc_tsn_enable_launchtime(struct igc_adapter *adapter,
 	if (err)
 		return err;
 
-	return igc_tsn_offload_apply(adapter);
+	return igc_tsn_offload_apply(adapter, qopt->enable);
 }
 
 static int igc_tsn_clear_schedule(struct igc_adapter *adapter)
@@ -5926,6 +5926,7 @@ static int igc_save_qbv_schedule(struct igc_adapter *adapter,
 				 struct tc_taprio_qopt_offload *qopt)
 {
 	bool queue_configured[IGC_MAX_TX_QUEUES] = { };
+	struct igc_hw *hw = &adapter->hw;
 	u32 start_time = 0, end_time = 0;
 	size_t n;
 
@@ -5937,7 +5938,7 @@ static int igc_save_qbv_schedule(struct igc_adapter *adapter,
 	if (qopt->base_time < 0)
 		return -ERANGE;
 
-	if (adapter->base_time)
+	if (igc_is_device_id_i225(hw) && adapter->base_time)
 		return -EALREADY;
 
 	if (!validate_schedule(adapter, qopt))
@@ -6003,7 +6004,7 @@ static int igc_tsn_enable_qbv_scheduling(struct igc_adapter *adapter,
 	if (err)
 		return err;
 
-	return igc_tsn_offload_apply(adapter);
+	return igc_tsn_offload_apply(adapter, qopt->enable);
 }
 
 static int igc_save_cbs_params(struct igc_adapter *adapter, int queue,
@@ -6071,7 +6072,7 @@ static int igc_tsn_enable_cbs(struct igc_adapter *adapter,
 	if (err)
 		return err;
 
-	return igc_tsn_offload_apply(adapter);
+	return igc_tsn_offload_apply(adapter, qopt->enable);
 }
 
 static int igc_setup_tc(struct net_device *dev, enum tc_setup_type type,
diff --git a/drivers/net/ethernet/intel/igc/igc_tsn.c b/drivers/net/ethernet/intel/igc/igc_tsn.c
index d7832cf1bc5b..5d351c873c41 100644
--- a/drivers/net/ethernet/intel/igc/igc_tsn.c
+++ b/drivers/net/ethernet/intel/igc/igc_tsn.c
@@ -232,7 +232,7 @@ static int igc_tsn_enable_offload(struct igc_adapter *adapter)
 		wr32(IGC_TXQCTL(i), txqctl);
 	}
 
-	tqavctrl = rd32(IGC_TQAVCTRL);
+	tqavctrl = rd32(IGC_TQAVCTRL) & ~IGC_TQAVCTRL_FUTSCDDIS;
 	tqavctrl |= IGC_TQAVCTRL_TRANSMIT_MODE_TSN | IGC_TQAVCTRL_ENHANCED_QAV;
 
 	cycle = adapter->cycle_time;
@@ -249,8 +249,11 @@ static int igc_tsn_enable_offload(struct igc_adapter *adapter)
 	} else {
 		/* According to datasheet section 7.5.2.9.3.3, FutScdDis bit
 		 * has to be configured before the cycle time and base time.
+		 * Tx won't hang if there is a GCL is already running,
+		 * so in this case we don't need to set FutScdDis.
 		 */
-		if (igc_is_device_id_i226(hw))
+		if (igc_is_device_id_i226(hw) &&
+		    !(rd32(IGC_BASET_H) || rd32(IGC_BASET_L)))
 			tqavctrl |= IGC_TQAVCTRL_FUTSCDDIS;
 	}
 
@@ -293,11 +296,13 @@ int igc_tsn_reset(struct igc_adapter *adapter)
 	return err;
 }
 
-int igc_tsn_offload_apply(struct igc_adapter *adapter)
+int igc_tsn_offload_apply(struct igc_adapter *adapter, bool enable)
 {
+	struct igc_hw *hw = &adapter->hw;
 	int err;
 
-	if (netif_running(adapter->netdev)) {
+	if (netif_running(adapter->netdev) &&
+	    (igc_is_device_id_i225(hw) || !enable)) {
 		schedule_work(&adapter->reset_task);
 		return 0;
 	}
diff --git a/drivers/net/ethernet/intel/igc/igc_tsn.h b/drivers/net/ethernet/intel/igc/igc_tsn.h
index b53e6af560b7..631222bb6eb5 100644
--- a/drivers/net/ethernet/intel/igc/igc_tsn.h
+++ b/drivers/net/ethernet/intel/igc/igc_tsn.h
@@ -4,7 +4,7 @@
 #ifndef _IGC_TSN_H_
 #define _IGC_TSN_H_
 
-int igc_tsn_offload_apply(struct igc_adapter *adapter);
+int igc_tsn_offload_apply(struct igc_adapter *adapter, bool enable);
 int igc_tsn_reset(struct igc_adapter *adapter);
 void igc_tsn_adjust_txtime_offset(struct igc_adapter *adapter);
 
-- 
2.35.1