net: enetc: refactor enetc_setup_tc_taprio() to have a switch/case for cmd

Make enetc_setup_tc_taprio() more amenable to future extensions, like
reporting statistics.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/enetc/enetc.c

@@ -2624,7 +2624,7 @@ static void enetc_debug_tx_ring_prios(struct enetc_ndev_priv *priv)
 			   priv->tx_ring[i]->prio);
 }
 
-static void enetc_reset_tc_mqprio(struct net_device *ndev)
+void enetc_reset_tc_mqprio(struct net_device *ndev)
 {
 	struct enetc_ndev_priv *priv = netdev_priv(ndev);
 	struct enetc_hw *hw = &priv->si->hw;
@@ -2649,6 +2649,7 @@ static void enetc_reset_tc_mqprio(struct net_device *ndev)
 
 	enetc_change_preemptible_tcs(priv, 0);
 }
+EXPORT_SYMBOL_GPL(enetc_reset_tc_mqprio);
 
 int enetc_setup_tc_mqprio(struct net_device *ndev, void *type_data)
 {

drivers/net/ethernet/freescale/enetc/enetc.h

@@ -429,6 +429,7 @@ struct net_device_stats *enetc_get_stats(struct net_device *ndev);
 void enetc_set_features(struct net_device *ndev, netdev_features_t features);
 int enetc_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd);
 int enetc_setup_tc_mqprio(struct net_device *ndev, void *type_data);
+void enetc_reset_tc_mqprio(struct net_device *ndev);
 int enetc_setup_bpf(struct net_device *ndev, struct netdev_bpf *bpf);
 int enetc_xdp_xmit(struct net_device *ndev, int num_frames,
 		   struct xdp_frame **frames, u32 flags);

drivers/net/ethernet/freescale/enetc/enetc_qos.c

@@ -43,10 +43,9 @@ void enetc_sched_speed_set(struct enetc_ndev_priv *priv, int speed)
 	enetc_port_wr(hw, ENETC_PMR, (tmp & ~ENETC_PMR_PSPEED_MASK) | pspeed);
 }
 
-static int enetc_setup_taprio(struct net_device *ndev,
+static int enetc_setup_taprio(struct enetc_ndev_priv *priv,
 			      struct tc_taprio_qopt_offload *admin_conf)
 {
-	struct enetc_ndev_priv *priv = netdev_priv(ndev);
 	struct enetc_hw *hw = &priv->si->hw;
 	struct enetc_cbd cbd = {.cmd = 0};
 	struct tgs_gcl_conf *gcl_config;
@@ -60,19 +59,13 @@ static int enetc_setup_taprio(struct net_device *ndev,
 	int err;
 	int i;
 
+	/* TSD and Qbv are mutually exclusive in hardware */
+	for (i = 0; i < priv->num_tx_rings; i++)
+		if (priv->tx_ring[i]->tsd_enable)
+			return -EBUSY;
+
 	if (admin_conf->num_entries > enetc_get_max_gcl_len(hw))
 		return -EINVAL;
-	gcl_len = admin_conf->num_entries;
-
-	tge = enetc_rd(hw, ENETC_PTGCR);
-	if (admin_conf->cmd == TAPRIO_CMD_DESTROY) {
-		enetc_wr(hw, ENETC_PTGCR, tge & ~ENETC_PTGCR_TGE);
-		enetc_reset_ptcmsdur(hw);
-
-		priv->active_offloads &= ~ENETC_F_QBV;
-
-		return 0;
-	}
 
 	if (admin_conf->cycle_time > U32_MAX ||
 	    admin_conf->cycle_time_extension > U32_MAX)
@@ -82,6 +75,7 @@ static int enetc_setup_taprio(struct net_device *ndev,
 	 * control BD descriptor.
 	 */
 	gcl_config = &cbd.gcl_conf;
+	gcl_len = admin_conf->num_entries;
 
 	data_size = struct_size(gcl_data, entry, gcl_len);
 	tmp = enetc_cbd_alloc_data_mem(priv->si, &cbd, data_size,
@@ -115,6 +109,7 @@ static int enetc_setup_taprio(struct net_device *ndev,
 	cbd.cls = BDCR_CMD_PORT_GCL;
 	cbd.status_flags = 0;
 
+	tge = enetc_rd(hw, ENETC_PTGCR);
 	enetc_wr(hw, ENETC_PTGCR, tge | ENETC_PTGCR_TGE);
 
 	err = enetc_send_cmd(priv->si, &cbd);
@@ -132,29 +127,57 @@ static int enetc_setup_taprio(struct net_device *ndev,
 	return 0;
 }
 
-int enetc_setup_tc_taprio(struct net_device *ndev, void *type_data)
+static void enetc_reset_taprio(struct enetc_ndev_priv *priv)
+{
+	struct enetc_hw *hw = &priv->si->hw;
+	u32 val;
+
+	val = enetc_rd(hw, ENETC_PTGCR);
+	enetc_wr(hw, ENETC_PTGCR, val & ~ENETC_PTGCR_TGE);
+	enetc_reset_ptcmsdur(hw);
+
+	priv->active_offloads &= ~ENETC_F_QBV;
+}
+
+static void enetc_taprio_destroy(struct net_device *ndev)
 {
-	struct tc_taprio_qopt_offload *taprio = type_data;
 	struct enetc_ndev_priv *priv = netdev_priv(ndev);
-	int err, i;
 
-	if (taprio->cmd != TAPRIO_CMD_REPLACE &&
-	    taprio->cmd != TAPRIO_CMD_DESTROY)
-		return -EOPNOTSUPP;
+	enetc_reset_taprio(priv);
+	enetc_reset_tc_mqprio(ndev);
+}
 
-	/* TSD and Qbv are mutually exclusive in hardware */
-	for (i = 0; i < priv->num_tx_rings; i++)
-		if (priv->tx_ring[i]->tsd_enable)
-			return -EBUSY;
+static int enetc_taprio_replace(struct net_device *ndev,
+				struct tc_taprio_qopt_offload *offload)
+{
+	struct enetc_ndev_priv *priv = netdev_priv(ndev);
+	int err;
 
-	err = enetc_setup_tc_mqprio(ndev, &taprio->mqprio);
+	err = enetc_setup_tc_mqprio(ndev, &offload->mqprio);
 	if (err)
 		return err;
 
-	err = enetc_setup_taprio(ndev, taprio);
-	if (err) {
-		taprio->mqprio.qopt.num_tc = 0;
-		enetc_setup_tc_mqprio(ndev, &taprio->mqprio);
+	err = enetc_setup_taprio(priv, offload);
+	if (err)
+		enetc_reset_tc_mqprio(ndev);
+
+	return err;
+}
+
+int enetc_setup_tc_taprio(struct net_device *ndev, void *type_data)
+{
+	struct tc_taprio_qopt_offload *offload = type_data;
+	int err = 0;
+
+	switch (offload->cmd) {
+	case TAPRIO_CMD_REPLACE:
+		err = enetc_taprio_replace(ndev, offload);
+		break;
+	case TAPRIO_CMD_DESTROY:
+		enetc_taprio_destroy(ndev);
+		break;
+	default:
+		err = -EOPNOTSUPP;
 	}
 
 	return err;