net/macb: add TX checksum offload feature

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index 2e4bfe3..cc36269 100644 (file)
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -1525,6 +1525,10 @@ static void macb_configure_dma(struct macb *bp)
                        dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg);
                dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
                dmacfg &= ~GEM_BIT(ENDIA);
+               if (bp->dev->features & NETIF_F_HW_CSUM)
+                       dmacfg |= GEM_BIT(TXCOEN);
+               else
+                       dmacfg &= ~GEM_BIT(TXCOEN);
                netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n",
                           dmacfg);
                gem_writel(bp, DMACFG, dmacfg);
@@ -1925,6 +1929,27 @@ int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 }
 EXPORT_SYMBOL_GPL(macb_ioctl);
 
+static int macb_set_features(struct net_device *netdev,
+                            netdev_features_t features)
+{
+       struct macb *bp = netdev_priv(netdev);
+       netdev_features_t changed = features ^ netdev->features;
+
+       /* TX checksum offload */
+       if ((changed & NETIF_F_HW_CSUM) && macb_is_gem(bp)) {
+               u32 dmacfg;
+
+               dmacfg = gem_readl(bp, DMACFG);
+               if (features & NETIF_F_HW_CSUM)
+                       dmacfg |= GEM_BIT(TXCOEN);
+               else
+                       dmacfg &= ~GEM_BIT(TXCOEN);
+               gem_writel(bp, DMACFG, dmacfg);
+       }
+
+       return 0;
+}
+
 static const struct net_device_ops macb_netdev_ops = {
        .ndo_open               = macb_open,
        .ndo_stop               = macb_close,
@@ -1938,6 +1963,7 @@ static const struct net_device_ops macb_netdev_ops = {
 #ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = macb_poll_controller,
 #endif
+       .ndo_set_features       = macb_set_features,
 };
 
 #if defined(CONFIG_OF)
@@ -2122,6 +2148,9 @@ static int __init macb_probe(struct platform_device *pdev)
 
        /* Set features */
        dev->hw_features = NETIF_F_SG;
+       /* Checksum offload is only available on gem with packet buffer */
+       if (macb_is_gem(bp) && !(bp->caps & MACB_CAPS_FIFO_MODE))
+               dev->hw_features |= NETIF_F_HW_CSUM;
        if (bp->caps & MACB_CAPS_SG_DISABLED)
                dev->hw_features &= ~NETIF_F_SG;
        dev->features = dev->hw_features;