ixgbe: DCB, do not call set_state() from IEEE mode

The DCB CEE command set_state() will complete successfully
but is misleading because it enables IEEE mode. After
this patch the command is failed.

And IEEE PFC/ETS is managed from ieee paths now instead
of using CEE primitives.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_dcb.c

@@ -40,7 +40,8 @@
  * hardware. The IEEE 802.1Qaz specification do not use bandwidth
  * groups so this is much simplified from the CEE case.
  */
-s32 ixgbe_ieee_credits(__u8 *bw, __u16 *refill, __u16 *max, int max_frame)
+static s32 ixgbe_ieee_credits(__u8 *bw, __u16 *refill,
+			      __u16 *max, int max_frame)
 {
 	int min_percent = 100;
 	int min_credit, multiplier;
@@ -291,6 +292,39 @@ s32 ixgbe_dcb_hw_pfc_config(struct ixgbe_hw *hw, u8 pfc_en)
 	return ret;
 }
 
+s32 ixgbe_dcb_hw_ets(struct ixgbe_hw *hw, struct ieee_ets *ets, int max_frame)
+{
+	__u16 refill[IEEE_8021QAZ_MAX_TCS], max[IEEE_8021QAZ_MAX_TCS];
+	__u8 prio_type[IEEE_8021QAZ_MAX_TCS];
+	int i;
+
+	/* naively give each TC a bwg to map onto CEE hardware */
+	__u8 bwg_id[IEEE_8021QAZ_MAX_TCS] = {0, 1, 2, 3, 4, 5, 6, 7};
+
+	/* Map TSA onto CEE prio type */
+	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
+		switch (ets->tc_tsa[i]) {
+		case IEEE_8021QAZ_TSA_STRICT:
+			prio_type[i] = 2;
+			break;
+		case IEEE_8021QAZ_TSA_ETS:
+			prio_type[i] = 0;
+			break;
+		default:
+			/* Hardware only supports priority strict or
+			 * ETS transmission selection algorithms if
+			 * we receive some other value from dcbnl
+			 * throw an error
+			 */
+			return -EINVAL;
+		}
+	}
+
+	ixgbe_ieee_credits(ets->tc_tx_bw, refill, max, max_frame);
+	return ixgbe_dcb_hw_ets_config(hw, refill, max,
+				       bwg_id, prio_type, ets->prio_tc);
+}
+
 s32 ixgbe_dcb_hw_ets_config(struct ixgbe_hw *hw,
 			    u16 *refill, u16 *max, u8 *bwg_id,
 			    u8 *prio_type, u8 *prio_tc)

drivers/net/ethernet/intel/ixgbe/ixgbe_dcb.h

@@ -29,6 +29,7 @@
 #ifndef _DCB_CONFIG_H_
 #define _DCB_CONFIG_H_
 
+#include <linux/dcbnl.h>
 #include "ixgbe_type.h"
 
 /* DCB data structures */
@@ -147,11 +148,11 @@ void ixgbe_dcb_unpack_bwgid(struct ixgbe_dcb_config *, int, u8 *);
 void ixgbe_dcb_unpack_prio(struct ixgbe_dcb_config *, int, u8 *);
 
 /* DCB credits calculation */
-s32 ixgbe_ieee_credits(__u8 *bw, __u16 *refill, __u16 *max, int max_frame);
 s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_hw *,
 				   struct ixgbe_dcb_config *, int, u8);
 
 /* DCB hw initialization */
+s32 ixgbe_dcb_hw_ets(struct ixgbe_hw *hw, struct ieee_ets *ets, int max);
 s32 ixgbe_dcb_hw_ets_config(struct ixgbe_hw *hw, u16 *refill, u16 *max,
 			    u8 *bwg_id, u8 *prio_type, u8 *tc_prio);
 s32 ixgbe_dcb_hw_pfc_config(struct ixgbe_hw *hw, u8 pfc_en);

drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c

@@ -114,6 +114,10 @@ static u8 ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
 	u8 err = 0;
 	struct ixgbe_adapter *adapter = netdev_priv(netdev);
 
+	/* Fail command if not in CEE mode */
+	if (!(adapter->dcbx_cap & DCB_CAP_DCBX_VER_CEE))
+		return 1;
+
 	/* verify there is something to do, if not then exit */
 	if (!!state != !(adapter->flags & IXGBE_FLAG_DCB_ENABLED))
 		return err;
@@ -301,6 +305,10 @@ static u8 ixgbe_dcbnl_set_all(struct net_device *netdev)
 	u8 up = dcb_getapp(netdev, &app);
 #endif
 
+	/* Fail command if not in CEE mode */
+	if (!(adapter->dcbx_cap & DCB_CAP_DCBX_VER_CEE))
+		return 1;
+
 	ret = ixgbe_copy_dcb_cfg(&adapter->temp_dcb_cfg, &adapter->dcb_cfg,
 				 MAX_TRAFFIC_CLASS);
 	if (ret)
@@ -537,13 +545,9 @@ static int ixgbe_dcbnl_ieee_setets(struct net_device *dev,
 				   struct ieee_ets *ets)
 {
 	struct ixgbe_adapter *adapter = netdev_priv(dev);
-	__u16 refill[IEEE_8021QAZ_MAX_TCS], max[IEEE_8021QAZ_MAX_TCS];
-	__u8 prio_type[IEEE_8021QAZ_MAX_TCS];
 	int max_frame = dev->mtu + ETH_HLEN + ETH_FCS_LEN;
-	int i, err;
+	int i;
-	__u64 *p = (__u64 *) ets->prio_tc;
+	__u8 max_tc = 0;
-	/* naively give each TC a bwg to map onto CEE hardware */
-	__u8 bwg_id[IEEE_8021QAZ_MAX_TCS] = {0, 1, 2, 3, 4, 5, 6, 7};
 
 	if (!(adapter->dcbx_cap & DCB_CAP_DCBX_VER_IEEE))
 		return -EINVAL;
@@ -557,34 +561,18 @@ static int ixgbe_dcbnl_ieee_setets(struct net_device *dev,
 
 	memcpy(adapter->ixgbe_ieee_ets, ets, sizeof(*adapter->ixgbe_ieee_ets));
 
-	/* Map TSA onto CEE prio type */
 	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
-		switch (ets->tc_tsa[i]) {
+		if (ets->prio_tc[i] > max_tc)
-		case IEEE_8021QAZ_TSA_STRICT:
+			max_tc = ets->prio_tc[i];
-			prio_type[i] = 2;
-			break;
-		case IEEE_8021QAZ_TSA_ETS:
-			prio_type[i] = 0;
-			break;
-		default:
-			/* Hardware only supports priority strict or
-			 * ETS transmission selection algorithms if
-			 * we receive some other value from dcbnl
-			 * throw an error
-			 */
-			return -EINVAL;
-		}
 	}
 
-	if (*p)
+	if (max_tc)
-		ixgbe_dcbnl_set_state(dev, 1);
+		max_tc++;
-	else
-		ixgbe_dcbnl_set_state(dev, 0);
 
-	ixgbe_ieee_credits(ets->tc_tx_bw, refill, max, max_frame);
+	if (max_tc != netdev_get_num_tc(dev))
-	err = ixgbe_dcb_hw_ets_config(&adapter->hw, refill, max,
+		ixgbe_setup_tc(dev, max_tc);
-				      bwg_id, prio_type, ets->prio_tc);
+
-	return err;
+	return ixgbe_dcb_hw_ets(&adapter->hw, ets, max_frame);
 }
 
 static int ixgbe_dcbnl_ieee_getpfc(struct net_device *dev,
@@ -615,7 +603,6 @@ static int ixgbe_dcbnl_ieee_setpfc(struct net_device *dev,
 				   struct ieee_pfc *pfc)
 {
 	struct ixgbe_adapter *adapter = netdev_priv(dev);
-	int err;
 
 	if (!(adapter->dcbx_cap & DCB_CAP_DCBX_VER_IEEE))
 		return -EINVAL;
@@ -628,8 +615,7 @@ static int ixgbe_dcbnl_ieee_setpfc(struct net_device *dev,
 	}
 
 	memcpy(adapter->ixgbe_ieee_pfc, pfc, sizeof(*adapter->ixgbe_ieee_pfc));
-	err = ixgbe_dcb_hw_pfc_config(&adapter->hw, pfc->pfc_en);
+	return ixgbe_dcb_hw_pfc_config(&adapter->hw, pfc->pfc_en);
-	return err;
 }
 
 #ifdef IXGBE_FCOE
@@ -740,7 +726,7 @@ static u8 ixgbe_dcbnl_setdcbx(struct net_device *dev, u8 mode)
 		 */
 		ixgbe_dcbnl_ieee_setets(dev, &ets);
 		ixgbe_dcbnl_ieee_setpfc(dev, &pfc);
-		ixgbe_dcbnl_set_state(dev, 0);
+		ixgbe_setup_tc(dev, 0);
 	}
 
 	return 0;

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

@@ -3319,12 +3319,18 @@ static void ixgbe_configure_dcb(struct ixgbe_adapter *adapter)
 	} else {
 		struct net_device *dev = adapter->netdev;
 
-		if (adapter->ixgbe_ieee_ets)
+		if (adapter->ixgbe_ieee_ets) {
-			dev->dcbnl_ops->ieee_setets(dev,
+			struct ieee_ets *ets = adapter->ixgbe_ieee_ets;
-						    adapter->ixgbe_ieee_ets);
+			int max_frame = dev->mtu + ETH_HLEN + ETH_FCS_LEN;
-		if (adapter->ixgbe_ieee_pfc)
+
-			dev->dcbnl_ops->ieee_setpfc(dev,
+			ixgbe_dcb_hw_ets(&adapter->hw, ets, max_frame);
-						    adapter->ixgbe_ieee_pfc);
+		}
+
+		if (adapter->ixgbe_ieee_pfc) {
+			struct ieee_pfc *pfc = adapter->ixgbe_ieee_pfc;
+
+			ixgbe_dcb_hw_pfc_config(&adapter->hw, pfc->pfc_en);
+		}
 	}
 
 	/* Enable RSS Hash per TC */