net: ksz884x: convert to hw_features

This also fixes possible race when changing receive checksum state
and removes IPV6_CSUM_GEN_HACK as it's always set.

BTW, The claim about fake IPV6 checksum looks dubious. If that were true,
then there's a problem in networking core and should be fixed there and not
in random drivers.

BTW#2, there's no MAINTAINERS entry for this driver. I assume this driver
is supported by Micrel?

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 21 insertions, 52 deletions

diff --git a/drivers/net/ksz884x.c b/drivers/net/ksz884x.c
index 7f7d5708a658..2c37a3804303 100644
--- a/drivers/net/ksz884x.c
+++ b/drivers/net/ksz884x.c
@@ -1221,7 +1221,6 @@ struct ksz_port_info {
 #define LINK_INT_WORKING                (1 << 0)
 #define SMALL_PACKET_TX_BUG             (1 << 1)
 #define HALF_DUPLEX_SIGNAL_BUG          (1 << 2)
-#define IPV6_CSUM_GEN_HACK              (1 << 3)
 #define RX_HUGE_FRAME                   (1 << 4)
 #define STP_SUPPORT                     (1 << 8)
 
@@ -3748,7 +3747,6 @@ static int hw_init(struct ksz_hw *hw)
                 if (1 == rc)
                         hw->features |= HALF_DUPLEX_SIGNAL_BUG;
         }
-        hw->features |= IPV6_CSUM_GEN_HACK;
         return rc;
 }
 
@@ -4887,8 +4885,7 @@ static netdev_tx_t netdev_tx(struct sk_buff *skb, struct net_device *dev)
         left = hw_alloc_pkt(hw, skb->len, num);
         if (left) {
                 if (left < num ||
-                                ((hw->features & IPV6_CSUM_GEN_HACK) &&
-                                (CHECKSUM_PARTIAL == skb->ip_summed) &&
+                                ((CHECKSUM_PARTIAL == skb->ip_summed) &&
                                 (ETH_P_IPV6 == htons(skb->protocol)))) {
                         struct sk_buff *org_skb = skb;
 
@@ -6583,57 +6580,33 @@ static void netdev_get_ethtool_stats(struct net_device *dev,
 }
 
 /**
- * netdev_get_rx_csum - get receive checksum support
+ * netdev_set_features - set receive checksum support
  * @dev:        Network device.
- *
- * This function gets receive checksum support setting.
- *
- * Return true if receive checksum is enabled; false otherwise.
- */
-static u32 netdev_get_rx_csum(struct net_device *dev)
-{
-        struct dev_priv *priv = netdev_priv(dev);
-        struct dev_info *hw_priv = priv->adapter;
-        struct ksz_hw *hw = &hw_priv->hw;
-
-        return hw->rx_cfg &
-                (DMA_RX_CSUM_UDP |
-                DMA_RX_CSUM_TCP |
-                DMA_RX_CSUM_IP);
-}
-
-/**
- * netdev_set_rx_csum - set receive checksum support
- * @dev:        Network device.
- * @data:       Zero to disable receive checksum support.
+ * @features:   New device features (offloads).
  *
  * This function sets receive checksum support setting.
  *
  * Return 0 if successful; otherwise an error code.
  */
-static int netdev_set_rx_csum(struct net_device *dev, u32 data)
+static int netdev_set_features(struct net_device *dev, u32 features)
 {
         struct dev_priv *priv = netdev_priv(dev);
         struct dev_info *hw_priv = priv->adapter;
         struct ksz_hw *hw = &hw_priv->hw;
-        u32 new_setting = hw->rx_cfg;
 
-        if (data)
-                new_setting |=
-                        (DMA_RX_CSUM_UDP | DMA_RX_CSUM_TCP |
-                        DMA_RX_CSUM_IP);
-        else
-                new_setting &=
-                        ~(DMA_RX_CSUM_UDP | DMA_RX_CSUM_TCP |
-                        DMA_RX_CSUM_IP);
-        new_setting &= ~DMA_RX_CSUM_UDP;
         mutex_lock(&hw_priv->lock);
-        if (new_setting != hw->rx_cfg) {
-                hw->rx_cfg = new_setting;
-                if (hw->enabled)
-                        writel(hw->rx_cfg, hw->io + KS_DMA_RX_CTRL);
-        }
+
+        /* see note in hw_setup() */
+        if (features & NETIF_F_RXCSUM)
+                hw->rx_cfg |= DMA_RX_CSUM_TCP | DMA_RX_CSUM_IP;
+        else
+                hw->rx_cfg &= ~(DMA_RX_CSUM_TCP | DMA_RX_CSUM_IP);
+
+        if (hw->enabled)
+                writel(hw->rx_cfg, hw->io + KS_DMA_RX_CTRL);
+
         mutex_unlock(&hw_priv->lock);
+
         return 0;
 }
 
@@ -6658,12 +6631,6 @@ static struct ethtool_ops netdev_ethtool_ops = {
         .get_strings            = netdev_get_strings,
         .get_sset_count         = netdev_get_sset_count,
         .get_ethtool_stats      = netdev_get_ethtool_stats,
-        .get_rx_csum            = netdev_get_rx_csum,
-        .set_rx_csum            = netdev_set_rx_csum,
-        .get_tx_csum            = ethtool_op_get_tx_csum,
-        .set_tx_csum            = ethtool_op_set_tx_csum,
-        .get_sg                 = ethtool_op_get_sg,
-        .set_sg                 = ethtool_op_set_sg,
 };
 
 /*
@@ -6828,14 +6795,15 @@ static int __init netdev_init(struct net_device *dev)
         /* 500 ms timeout */
         dev->watchdog_timeo = HZ / 2;
 
-        dev->features |= NETIF_F_IP_CSUM;
+        dev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;
 
         /*
          * Hardware does not really support IPv6 checksum generation, but
-         * driver actually runs faster with this on.  Refer IPV6_CSUM_GEN_HACK.
+         * driver actually runs faster with this on.
          */
-        dev->features |= NETIF_F_IPV6_CSUM;
-        dev->features |= NETIF_F_SG;
+        dev->hw_features |= NETIF_F_IPV6_CSUM;
+
+        dev->features |= dev->hw_features;
 
         sema_init(&priv->proc_sem, 1);
 
@@ -6860,6 +6828,7 @@ static const struct net_device_ops netdev_ops = {
         .ndo_start_xmit         = netdev_tx,
         .ndo_tx_timeout         = netdev_tx_timeout,
         .ndo_change_mtu         = netdev_change_mtu,
+        .ndo_set_features       = netdev_set_features,
         .ndo_set_mac_address    = netdev_set_mac_address,
         .ndo_validate_addr      = eth_validate_addr,
         .ndo_do_ioctl           = netdev_ioctl,