[PATCH v2 3/9] ftgmac100: Add ndo_set_rx_mode() and support for multicast & promisc

[Benjamin Herrenschmidt]

This adds the ndo_set_rx_mode() callback to configure the
multicast filters, promisc and allmulti options.

Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 52 ++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c 
b/drivers/net/ethernet/faraday/ftgmac100.c
index 4be8bf9..551ab3e 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -30,6 +30,7 @@
 #include <linux/netdevice.h>
 #include <linux/phy.h>
 #include <linux/platform_device.h>
+#include <linux/crc32.h>
 #include <net/ip.h>
 #include <net/ncsi.h>
 
@@ -97,6 +98,10 @@ struct ftgmac100 {
        int cur_duplex;
        bool use_ncsi;
 
+       /* Multicast filter settings */
+       u32 maht0;
+       u32 maht1;
+
        /* Flow control settings */
        bool tx_pause;
        bool rx_pause;
@@ -264,6 +269,10 @@ static void ftgmac100_init_hw(struct ftgmac100 *priv)
        /* Write MAC address */
        ftgmac100_write_mac_addr(priv, priv->netdev->dev_addr);
 
+       /* Write multicast filter */
+       iowrite32(priv->maht0, priv->base + FTGMAC100_OFFSET_MAHT0);
+       iowrite32(priv->maht1, priv->base + FTGMAC100_OFFSET_MAHT1);
+
        /* Configure descriptor sizes and increase burst sizes according
         * to values in Aspeed SDK. The FIFO arbitration is enabled and
         * the thresholds set based on the recommended values in the
@@ -317,6 +326,12 @@ static void ftgmac100_start_hw(struct ftgmac100 *priv)
        /* Add other bits as needed */
        if (priv->cur_duplex == DUPLEX_FULL)
                maccr |= FTGMAC100_MACCR_FULLDUP;
+       if (priv->netdev->flags & IFF_PROMISC)
+               maccr |= FTGMAC100_MACCR_RX_ALL;
+       if (priv->netdev->flags & IFF_ALLMULTI)
+               maccr |= FTGMAC100_MACCR_RX_MULTIPKT;
+       else if (netdev_mc_count(priv->netdev))
+               maccr |= FTGMAC100_MACCR_HT_MULTI_EN;
 
        /* Hit the HW */
        iowrite32(maccr, priv->base + FTGMAC100_OFFSET_MACCR);
@@ -327,6 +342,42 @@ static void ftgmac100_stop_hw(struct ftgmac100 *priv)
        iowrite32(0, priv->base + FTGMAC100_OFFSET_MACCR);
 }
 
+static void ftgmac100_calc_mc_hash(struct ftgmac100 *priv)
+{
+       struct netdev_hw_addr *ha;
+
+       priv->maht1 = 0;
+       priv->maht0 = 0;
+       netdev_for_each_mc_addr(ha, priv->netdev) {
+               u32 crc_val = ether_crc_le(ETH_ALEN, ha->addr);
+
+               crc_val = (~(crc_val >> 2)) & 0x3f;
+               if (crc_val >= 32)
+                       priv->maht1 |= 1ul << (crc_val - 32);
+               else
+                       priv->maht0 |= 1ul << (crc_val);
+       }
+}
+
+static void ftgmac100_set_rx_mode(struct net_device *netdev)
+{
+       struct ftgmac100 *priv = netdev_priv(netdev);
+
+       /* Setup the hash filter */
+       ftgmac100_calc_mc_hash(priv);
+
+       /* Interface down ? that's all there is to do */
+       if (!netif_running(netdev))
+               return;
+
+       /* Update the HW */
+       iowrite32(priv->maht0, priv->base + FTGMAC100_OFFSET_MAHT0);
+       iowrite32(priv->maht1, priv->base + FTGMAC100_OFFSET_MAHT1);
+
+       /* Reconfigure MACCR */
+       ftgmac100_start_hw(priv);
+}
+
 static int ftgmac100_alloc_rx_buf(struct ftgmac100 *priv, unsigned int entry,
                                  struct ftgmac100_rxdes *rxdes, gfp_t gfp)
 {
@@ -1501,6 +1552,7 @@ static const struct net_device_ops ftgmac100_netdev_ops = 
{
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_do_ioctl           = ftgmac100_do_ioctl,
        .ndo_tx_timeout         = ftgmac100_tx_timeout,
+       .ndo_set_rx_mode        = ftgmac100_set_rx_mode,
 };
 
 static int ftgmac100_setup_mdio(struct net_device *netdev)
-- 
2.9.3