[PATCH net-next v6 5/6] net: stmmac: xgmac: Complete FPE support
Vladimir Oltean
olteanv at gmail.com
Wed Oct 30 04:51:30 PDT 2024
On Wed, Oct 30, 2024 at 01:36:14PM +0800, Furong Xu wrote:
> +int dwxgmac3_fpe_map_preemption_class(struct net_device *ndev,
> + struct netlink_ext_ack *extack, u32 pclass)
> +{
> + u32 val, offset, count, preemptible_txqs = 0;
> + struct stmmac_priv *priv = netdev_priv(ndev);
> + u32 num_tc = ndev->num_tc;
Curiously, struct net_device :: num_tc is s16. Just use netdev_get_num_tc()
and store it as int...
> +
> + if (!num_tc) {
> + /* Restore default TC:Queue mapping */
> + for (u32 i = 0; i < priv->plat->tx_queues_to_use; i++) {
> + val = readl(priv->ioaddr + XGMAC_MTL_TXQ_OPMODE(i));
> + writel(u32_replace_bits(val, i, XGMAC_Q2TCMAP),
> + priv->ioaddr + XGMAC_MTL_TXQ_OPMODE(i));
> + }
> + }
> +
> + /* Synopsys Databook:
> + * "All Queues within a traffic class are selected in a round robin
> + * fashion (when packets are available) when the traffic class is
> + * selected by the scheduler for packet transmission. This is true for
> + * any of the scheduling algorithms."
> + */
> + for (u32 tc = 0; tc < num_tc; tc++) {
> + count = ndev->tc_to_txq[tc].count;
> + offset = ndev->tc_to_txq[tc].offset;
> +
> + if (pclass & BIT(tc))
> + preemptible_txqs |= GENMASK(offset + count - 1, offset);
> +
> + for (u32 i = 0; i < count; i++) {
> + val = readl(priv->ioaddr + XGMAC_MTL_TXQ_OPMODE(offset + i));
> + writel(u32_replace_bits(val, tc, XGMAC_Q2TCMAP),
> + priv->ioaddr + XGMAC_MTL_TXQ_OPMODE(offset + i));
> + }
> + }
> +
> + val = readl(priv->ioaddr + XGMAC_MTL_FPE_CTRL_STS);
> + writel(u32_replace_bits(val, preemptible_txqs, FPE_MTL_PREEMPTION_CLASS),
> + priv->ioaddr + XGMAC_MTL_FPE_CTRL_STS);
> +
> + return 0;
> +}
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