[PATCH net-next v4] net: enetc: Replace ifdef with IS_ENABLED

[Martyn Welch <martyn.welch@collabora.com>]

The enetc driver uses ifdefs when checking whether
CONFIG_FSL_ENETC_PTP_CLOCK is enabled in a number of places. This works
if the driver is built-in but fails if the driver is available as a
kernel module. Replace the instances of ifdef with use of the IS_ENABLED
macro, that will evaluate as true when this feature is built as a kernel
module and follows the kernel's coding style.

Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
---

Changes since v1:
  - Switched from preprocessor conditionals to normal C conditionals.

Changes since v2:
  - Reworked enetc_ethtool.c changes to fit around changes merged in
    net-next.

Changes since v3:
  - Correction of SOB ordering.
  - Removal of unneeded `__maybe_unused` tags.

drivers/net/ethernet/freescale/enetc/enetc.c  | 22 ++++++++-----------
 drivers/net/ethernet/freescale/enetc/enetc.h  |  9 +++-----
 .../ethernet/freescale/enetc/enetc_ethtool.c  | 12 ++++++----
 3 files changed, 20 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 5c45f42232d3..66e3e982882a 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -977,7 +977,6 @@ static int enetc_refill_rx_ring(struct enetc_bdr *rx_ring, const int buff_cnt)
 	return j;
 }
 
-#ifdef CONFIG_FSL_ENETC_PTP_CLOCK
 static void enetc_get_rx_tstamp(struct net_device *ndev,
 				union enetc_rx_bd *rxbd,
 				struct sk_buff *skb)
@@ -1001,7 +1000,6 @@ static void enetc_get_rx_tstamp(struct net_device *ndev,
 		shhwtstamps->hwtstamp = ns_to_ktime(tstamp);
 	}
 }
-#endif
 
 static void enetc_get_offloads(struct enetc_bdr *rx_ring,
 			       union enetc_rx_bd *rxbd, struct sk_buff *skb)
@@ -1041,10 +1039,9 @@ static void enetc_get_offloads(struct enetc_bdr *rx_ring,
 		__vlan_hwaccel_put_tag(skb, tpid, le16_to_cpu(rxbd->r.vlan_opt));
 	}
 
-#ifdef CONFIG_FSL_ENETC_PTP_CLOCK
-	if (priv->active_offloads & ENETC_F_RX_TSTAMP)
+	if (IS_ENABLED(CONFIG_FSL_ENETC_PTP_CLOCK) &&
+	    (priv->active_offloads & ENETC_F_RX_TSTAMP))
 		enetc_get_rx_tstamp(rx_ring->ndev, rxbd, skb);
-#endif
 }
 
 /* This gets called during the non-XDP NAPI poll cycle as well as on XDP_PASS,
@@ -2882,7 +2879,6 @@ void enetc_set_features(struct net_device *ndev, netdev_features_t features)
 }
 EXPORT_SYMBOL_GPL(enetc_set_features);
 
-#ifdef CONFIG_FSL_ENETC_PTP_CLOCK
 static int enetc_hwtstamp_set(struct net_device *ndev, struct ifreq *ifr)
 {
 	struct enetc_ndev_priv *priv = netdev_priv(ndev);
@@ -2951,17 +2947,17 @@ static int enetc_hwtstamp_get(struct net_device *ndev, struct ifreq *ifr)
 	return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
 	       -EFAULT : 0;
 }
-#endif
 
 int enetc_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
 {
 	struct enetc_ndev_priv *priv = netdev_priv(ndev);
-#ifdef CONFIG_FSL_ENETC_PTP_CLOCK
-	if (cmd == SIOCSHWTSTAMP)
-		return enetc_hwtstamp_set(ndev, rq);
-	if (cmd == SIOCGHWTSTAMP)
-		return enetc_hwtstamp_get(ndev, rq);
-#endif
+
+	if (IS_ENABLED(CONFIG_FSL_ENETC_PTP_CLOCK)) {
+		if (cmd == SIOCSHWTSTAMP)
+			return enetc_hwtstamp_set(ndev, rq);
+		if (cmd == SIOCGHWTSTAMP)
+			return enetc_hwtstamp_get(ndev, rq);
+	}
 
 	if (!priv->phylink)
 		return -EOPNOTSUPP;
diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h
index a9c2ff22431c..97524dfa234c 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc.h
@@ -184,10 +184,9 @@ static inline union enetc_rx_bd *enetc_rxbd(struct enetc_bdr *rx_ring, int i)
 {
 	int hw_idx = i;
 
-#ifdef CONFIG_FSL_ENETC_PTP_CLOCK
-	if (rx_ring->ext_en)
+	if (IS_ENABLED(CONFIG_FSL_ENETC_PTP_CLOCK) && rx_ring->ext_en)
 		hw_idx = 2 * i;
-#endif
+
 	return &(((union enetc_rx_bd *)rx_ring->bd_base)[hw_idx]);
 }
 
@@ -199,10 +198,8 @@ static inline void enetc_rxbd_next(struct enetc_bdr *rx_ring,
 
 	new_rxbd++;
 
-#ifdef CONFIG_FSL_ENETC_PTP_CLOCK
-	if (rx_ring->ext_en)
+	if (IS_ENABLED(CONFIG_FSL_ENETC_PTP_CLOCK) && rx_ring->ext_en)
 		new_rxbd++;
-#endif
 
 	if (unlikely(++new_index == rx_ring->bd_count)) {
 		new_rxbd = rx_ring->bd_base;
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
index 47c478e08d44..2563eb8ac7b6 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
@@ -851,7 +851,12 @@ static int enetc_get_ts_info(struct net_device *ndev,
 		symbol_put(enetc_phc_index);
 	}
 
-#ifdef CONFIG_FSL_ENETC_PTP_CLOCK
+	if (!IS_ENABLED(CONFIG_FSL_ENETC_PTP_CLOCK)) {
+		info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE;
+
+		return 0;
+	}
+
 	info->so_timestamping = SOF_TIMESTAMPING_TX_HARDWARE |
 				SOF_TIMESTAMPING_RX_HARDWARE |
 				SOF_TIMESTAMPING_RAW_HARDWARE |
@@ -860,11 +865,10 @@ static int enetc_get_ts_info(struct net_device *ndev,
 	info->tx_types = (1 << HWTSTAMP_TX_OFF) |
 			 (1 << HWTSTAMP_TX_ON) |
 			 (1 << HWTSTAMP_TX_ONESTEP_SYNC);
+
 	info->rx_filters = (1 << HWTSTAMP_FILTER_NONE) |
 			   (1 << HWTSTAMP_FILTER_ALL);
-#else
-	info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE;
-#endif
+
 	return 0;
 }
 
-- 
2.45.2