> +static void owl_emac_set_multicast(struct net_device *netdev, int count)
> +{
> + struct owl_emac_priv *priv = netdev_priv(netdev);
> + struct netdev_hw_addr *ha;
> + int index = 0;
> +
> + if (count <= 0) {
> + priv->mcaddr_list.count = 0;
> + return;
> + }
> +
> + netdev_for_each_mc_addr(ha, netdev) {
> + if (!is_multicast_ether_addr(ha->addr))
> + continue;
Is this possible?
> +
> + WARN_ON(index >= OWL_EMAC_MAX_MULTICAST_ADDRS);
> + ether_addr_copy(priv->mcaddr_list.addrs[index++], ha->addr);
> + }
> +
> + priv->mcaddr_list.count = index;
> +
> + owl_emac_setup_frame_xmit(priv);
> +}
> +
> +static void owl_emac_ndo_set_rx_mode(struct net_device *netdev)
> +{
> + struct owl_emac_priv *priv = netdev_priv(netdev);
> + u32 status, val = 0;
> + int mcast_count = 0;
> +
> + if (netdev->flags & IFF_PROMISC) {
> + val = OWL_EMAC_BIT_MAC_CSR6_PR;
> + } else if (netdev->flags & IFF_ALLMULTI) {
> + val = OWL_EMAC_BIT_MAC_CSR6_PM;
> + } else if (netdev->flags & IFF_MULTICAST) {
> + mcast_count = netdev_mc_count(netdev);
> +
> + if (mcast_count > OWL_EMAC_MAX_MULTICAST_ADDRS) {
> + val = OWL_EMAC_BIT_MAC_CSR6_PM;
> + mcast_count = 0;
> + }
> + }
> +
> + spin_lock_bh(&priv->lock);
> +
> + /* Temporarily stop DMA TX & RX. */
> + status = owl_emac_dma_cmd_stop(priv);
> +
> + /* Update operation modes. */
> + owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6,
> + OWL_EMAC_BIT_MAC_CSR6_PR | OWL_EMAC_BIT_MAC_CSR6_PM,
> + val);
> +
> + /* Restore DMA TX & RX status. */
> + owl_emac_dma_cmd_set(priv, status);
> +
> + spin_unlock_bh(&priv->lock);
> +
> + /* Set/reset multicast addr list. */
> + owl_emac_set_multicast(netdev, mcast_count);
> +}
I think this can be simplified. At least, you had me going around in
circles a while trying to see if WARN_ON() could be triggered from
user space.
If you have more than OWL_EMAC_MAX_MULTICAST_ADDRS MC addresses, you
go into promisc mode. Can you then skip calling
owl_emac_set_multicast(), which appears not to do too much useful when
passed 0?
Andrew
