Merge branch 'stmmac-EST'

Rohan G says:

====================
net: stmmac: EST conformance support

This patchset enables support for queueMaxSDU and transmission overrun
counters which are required for Qbv conformance.
====================

Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/stmicro/stmmac/common.h

···
 	unsigned long mtl_est_hlbf;
 	unsigned long mtl_est_btre;
 	unsigned long mtl_est_btrlm;
+	unsigned long max_sdu_txq_drop[MTL_MAX_TX_QUEUES];
+	unsigned long mtl_est_txq_hlbf[MTL_MAX_TX_QUEUES];
 	/* per queue statistics */
 	struct stmmac_txq_stats txq_stats[MTL_MAX_TX_QUEUES];
 	struct stmmac_rxq_stats rxq_stats[MTL_MAX_RX_QUEUES];

drivers/net/ethernet/stmicro/stmmac/stmmac_est.c

···
 	u32 status, value, feqn, hbfq, hbfs, btrl, btrl_max;
 	void __iomem *est_addr = priv->estaddr;
 	u32 txqcnt_mask = BIT(txqcnt) - 1;
+	int i;
 
 	status = readl(est_addr + EST_STATUS);
 
···
 		hbfs = value & EST_SZ_CAP_HBFS_MASK;
 
 		x->mtl_est_hlbf++;
+
+		for (i = 0; i < txqcnt; i++) {
+			if (feqn & BIT(i))
+				x->mtl_est_txq_hlbf[i]++;
+		}
 
 		/* Clear Interrupt */
 		writel(feqn, est_addr + EST_FRM_SZ_ERR);

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

···
 		if (!xsk_tx_peek_desc(pool, &xdp_desc))
 			break;
 
+		if (priv->plat->est && priv->plat->est->enable &&
+		    priv->plat->est->max_sdu[queue] &&
+		    xdp_desc.len > priv->plat->est->max_sdu[queue]) {
+			priv->xstats.max_sdu_txq_drop[queue]++;
+			continue;
+		}
+
 		if (likely(priv->extend_desc))
 			tx_desc = (struct dma_desc *)(tx_q->dma_etx + entry);
 		else if (tx_q->tbs & STMMAC_TBS_AVAIL)
···
 			return stmmac_tso_xmit(skb, dev);
 	}
 
+	if (priv->plat->est && priv->plat->est->enable &&
+	    priv->plat->est->max_sdu[queue] &&
+	    skb->len > priv->plat->est->max_sdu[queue]){
+		priv->xstats.max_sdu_txq_drop[queue]++;
+		goto max_sdu_err;
+	}
+
 	if (unlikely(stmmac_tx_avail(priv, queue) < nfrags + 1)) {
 		if (!netif_tx_queue_stopped(netdev_get_tx_queue(dev, queue))) {
 			netif_tx_stop_queue(netdev_get_tx_queue(priv->dev,
···
 
 dma_map_err:
 	netdev_err(priv->dev, "Tx DMA map failed\n");
+max_sdu_err:
 	dev_kfree_skb(skb);
 	priv->xstats.tx_dropped++;
 	return NETDEV_TX_OK;
···
 
 	if (stmmac_tx_avail(priv, queue) < STMMAC_TX_THRESH(priv))
 		return STMMAC_XDP_CONSUMED;
+
+	if (priv->plat->est && priv->plat->est->enable &&
+	    priv->plat->est->max_sdu[queue] &&
+	    xdpf->len > priv->plat->est->max_sdu[queue]) {
+		priv->xstats.max_sdu_txq_drop[queue]++;
+		return STMMAC_XDP_CONSUMED;
+	}
 
 	if (likely(priv->extend_desc))
 		tx_desc = (struct dma_desc *)(tx_q->dma_etx + entry);

drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c

···
 	return time;
 }
 
-static int tc_setup_taprio(struct stmmac_priv *priv,
-			   struct tc_taprio_qopt_offload *qopt)
+static void tc_taprio_map_maxsdu_txq(struct stmmac_priv *priv,
+				     struct tc_taprio_qopt_offload *qopt)
+{
+	struct plat_stmmacenet_data *plat = priv->plat;
+	u32 num_tc = qopt->mqprio.qopt.num_tc;
+	u32 offset, count, i, j;
+
+	/* QueueMaxSDU received from the driver corresponds to the Linux traffic
+	 * class. Map queueMaxSDU per Linux traffic class to DWMAC Tx queues.
+	 */
+	for (i = 0; i < num_tc; i++) {
+		if (!qopt->max_sdu[i])
+			continue;
+
+		offset = qopt->mqprio.qopt.offset[i];
+		count = qopt->mqprio.qopt.count[i];
+
+		for (j = offset; j < offset + count; j++)
+			plat->est->max_sdu[j] = qopt->max_sdu[i] + ETH_HLEN - ETH_TLEN;
+	}
+}
+
+static int tc_taprio_configure(struct stmmac_priv *priv,
+			       struct tc_taprio_qopt_offload *qopt)
 {
 	u32 size, wid = priv->dma_cap.estwid, dep = priv->dma_cap.estdep;
 	struct plat_stmmacenet_data *plat = priv->plat;
···
 
 	if (qopt->cmd == TAPRIO_CMD_DESTROY)
 		goto disable;
-	else if (qopt->cmd != TAPRIO_CMD_REPLACE)
-		return -EOPNOTSUPP;
 
 	if (qopt->num_entries >= dep)
 		return -EINVAL;
···
 
 	priv->plat->est->ter = qopt->cycle_time_extension;
 
+	tc_taprio_map_maxsdu_txq(priv, qopt);
+
 	if (fpe && !priv->dma_cap.fpesel) {
 		mutex_unlock(&priv->plat->est->lock);
 		return -EOPNOTSUPP;
···
 		priv->plat->est->enable = false;
 		stmmac_est_configure(priv, priv, priv->plat->est,
 				     priv->plat->clk_ptp_rate);
+		/* Reset taprio status */
+		for (i = 0; i < priv->plat->tx_queues_to_use; i++) {
+			priv->xstats.max_sdu_txq_drop[i] = 0;
+			priv->xstats.mtl_est_txq_hlbf[i] = 0;
+		}
 		mutex_unlock(&priv->plat->est->lock);
 	}
 
···
 	netdev_info(priv->dev, "stop FPE handshake\n");
 
 	return ret;
+}
+
+static void tc_taprio_stats(struct stmmac_priv *priv,
+			    struct tc_taprio_qopt_offload *qopt)
+{
+	u64 window_drops = 0;
+	int i = 0;
+
+	for (i = 0; i < priv->plat->tx_queues_to_use; i++)
+		window_drops += priv->xstats.max_sdu_txq_drop[i] +
+				priv->xstats.mtl_est_txq_hlbf[i];
+	qopt->stats.window_drops = window_drops;
+
+	/* Transmission overrun doesn't happen for stmmac, hence always 0 */
+	qopt->stats.tx_overruns = 0;
+}
+
+static void tc_taprio_queue_stats(struct stmmac_priv *priv,
+				  struct tc_taprio_qopt_offload *qopt)
+{
+	struct tc_taprio_qopt_queue_stats *q_stats = &qopt->queue_stats;
+	int queue = qopt->queue_stats.queue;
+
+	q_stats->stats.window_drops = priv->xstats.max_sdu_txq_drop[queue] +
+				      priv->xstats.mtl_est_txq_hlbf[queue];
+
+	/* Transmission overrun doesn't happen for stmmac, hence always 0 */
+	q_stats->stats.tx_overruns = 0;
+}
+
+static int tc_setup_taprio(struct stmmac_priv *priv,
+			   struct tc_taprio_qopt_offload *qopt)
+{
+	int err = 0;
+
+	switch (qopt->cmd) {
+	case TAPRIO_CMD_REPLACE:
+	case TAPRIO_CMD_DESTROY:
+		err = tc_taprio_configure(priv, qopt);
+		break;
+	case TAPRIO_CMD_STATS:
+		tc_taprio_stats(priv, qopt);
+		break;
+	case TAPRIO_CMD_QUEUE_STATS:
+		tc_taprio_queue_stats(priv, qopt);
+		break;
+	default:
+		err = -EOPNOTSUPP;
+	}
+
+	return err;
 }
 
 static int tc_setup_etf(struct stmmac_priv *priv,
···
 			return -EOPNOTSUPP;
 
 		caps->gate_mask_per_txq = true;
+		caps->supports_queue_max_sdu = true;
 
 		return 0;
 	}

include/linux/stmmac.h

···
 	u32 gcl_unaligned[EST_GCL];
 	u32 gcl[EST_GCL];
 	u32 gcl_size;
+	u32 max_sdu[MTL_MAX_TX_QUEUES];
 };
 
 struct stmmac_rxq_cfg {