octeontx2-pf: Allow both ntuple and TC features on the interface

The current implementation does not allow the user to enable both
hw-tc-offload and ntuple features on the interface. These checks
are added as TC flower offload and ntuple features internally configures
the same hardware resource MCAM. But TC HTB offload configures the
transmit scheduler which can be safely enabled on the interface with
ntuple feature.

This patch adds the same and ensures only TC flower offload and ntuple
features are mutually exclusive.

Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Hariprasad Kelam

drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c

@@ -1905,31 +1905,16 @@ int otx2_handle_ntuple_tc_features(struct net_device *netdev, netdev_features_t
 		}
 	}
 
-	if ((changed & NETIF_F_HW_TC) && tc) {
-		if (!pfvf->flow_cfg->max_flows) {
-			netdev_err(netdev,
-				   "Can't enable TC, MCAM entries not allocated\n");
-			return -EINVAL;
-		}
-	}
-
 	if ((changed & NETIF_F_HW_TC) && !tc &&
-	    pfvf->flow_cfg && pfvf->flow_cfg->nr_flows) {
+	    otx2_tc_flower_rule_cnt(pfvf)) {
 		netdev_err(netdev, "Can't disable TC hardware offload while flows are active\n");
 		return -EBUSY;
 	}
 
 	if ((changed & NETIF_F_NTUPLE) && ntuple &&
-	    (netdev->features & NETIF_F_HW_TC) && !(changed & NETIF_F_HW_TC)) {
-		netdev_err(netdev,
-			   "Can't enable NTUPLE when TC is active, disable TC and retry\n");
-		return -EINVAL;
-	}
-
-	if ((changed & NETIF_F_HW_TC) && tc &&
-	    (netdev->features & NETIF_F_NTUPLE) && !(changed & NETIF_F_NTUPLE)) {
+	    otx2_tc_flower_rule_cnt(pfvf) && !(changed & NETIF_F_HW_TC)) {
 		netdev_err(netdev,
-			   "Can't enable TC when NTUPLE is active, disable NTUPLE and retry\n");
+			   "Can't enable NTUPLE when TC flower offload is active, disable TC rules and retry\n");
 		return -EINVAL;
 	}
 

drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h

@@ -940,6 +940,15 @@ static inline u64 otx2_convert_rate(u64 rate)
 	return converted_rate;
 }
 
+static inline int otx2_tc_flower_rule_cnt(struct otx2_nic *pfvf)
+{
+	/* return here if MCAM entries not allocated */
+	if (!pfvf->flow_cfg)
+		return 0;
+
+	return pfvf->flow_cfg->nr_flows;
+}
+
 /* MSI-X APIs */
 void otx2_free_cints(struct otx2_nic *pfvf, int n);
 void otx2_set_cints_affinity(struct otx2_nic *pfvf);