net: stmmac: adding multiple napi mechanism

This patch adds the napi variable to the stmmac_rx_queue
structure and forces that operations like netif_queue_stopped,
netif_wake_queue, netif_stop_queue, netdev_reset_queue and
netdev_sent_queue be made by queue.

Signed-off-by: Joao Pinto <[email protected]>
Tested-by: Niklas Cassel <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Joao Pinto

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

@@ -72,6 +72,7 @@ struct stmmac_rx_queue {
 	u32 rx_zeroc_thresh;
 	dma_addr_t dma_rx_phy;
 	u32 rx_tail_addr;
+	struct napi_struct napi ____cacheline_aligned_in_smp;
 };
 
 struct stmmac_priv {
@@ -91,8 +92,6 @@ struct stmmac_priv {
 	u32 rx_riwt;
 	int hwts_rx_en;
 
-	struct napi_struct napi ____cacheline_aligned_in_smp;
-
 	void __iomem *ioaddr;
 	struct net_device *dev;
 	struct device *device;

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

@@ -138,6 +138,64 @@ static void stmmac_verify_args(void)
 		eee_timer = STMMAC_DEFAULT_LPI_TIMER;
 }
 
+/**
+ * stmmac_disable_all_queues - Disable all queues
+ * @priv: driver private structure
+ */
+static void stmmac_disable_all_queues(struct stmmac_priv *priv)
+{
+	u32 rx_queues_cnt = priv->plat->rx_queues_to_use;
+	u32 queue;
+
+	for (queue = 0; queue < rx_queues_cnt; queue++) {
+		struct stmmac_rx_queue *rx_q = &priv->rx_queue[queue];
+
+		napi_disable(&rx_q->napi);
+	}
+}
+
+/**
+ * stmmac_enable_all_queues - Enable all queues
+ * @priv: driver private structure
+ */
+static void stmmac_enable_all_queues(struct stmmac_priv *priv)
+{
+	u32 rx_queues_cnt = priv->plat->rx_queues_to_use;
+	u32 queue;
+
+	for (queue = 0; queue < rx_queues_cnt; queue++) {
+		struct stmmac_rx_queue *rx_q = &priv->rx_queue[queue];
+
+		napi_enable(&rx_q->napi);
+	}
+}
+
+/**
+ * stmmac_stop_all_queues - Stop all queues
+ * @priv: driver private structure
+ */
+static void stmmac_stop_all_queues(struct stmmac_priv *priv)
+{
+	u32 tx_queues_cnt = priv->plat->tx_queues_to_use;
+	u32 queue;
+
+	for (queue = 0; queue < tx_queues_cnt; queue++)
+		netif_tx_stop_queue(netdev_get_tx_queue(priv->dev, queue));
+}
+
+/**
+ * stmmac_start_all_queues - Start all queues
+ * @priv: driver private structure
+ */
+static void stmmac_start_all_queues(struct stmmac_priv *priv)
+{
+	u32 tx_queues_cnt = priv->plat->tx_queues_to_use;
+	u32 queue;
+
+	for (queue = 0; queue < tx_queues_cnt; queue++)
+		netif_tx_start_queue(netdev_get_tx_queue(priv->dev, queue));
+}
+
 /**
  * stmmac_clk_csr_set - dynamically set the MDC clock
  * @priv: driver private structure
@@ -1262,7 +1320,6 @@ static int init_dma_tx_desc_rings(struct net_device *dev)
 
 		for (i = 0; i < DMA_TX_SIZE; i++) {
 			struct dma_desc *p;
-
 			if (priv->extend_desc)
 				p = &((tx_q->dma_etx + i)->basic);
 			else
@@ -1286,9 +1343,9 @@ static int init_dma_tx_desc_rings(struct net_device *dev)
 
 		tx_q->dirty_tx = 0;
 		tx_q->cur_tx = 0;
-	}
 
-	netdev_reset_queue(priv->dev);
+		netdev_tx_reset_queue(netdev_get_tx_queue(priv->dev, queue));
+	}
 
 	return 0;
 }
@@ -1805,13 +1862,16 @@ static void stmmac_tx_clean(struct stmmac_priv *priv, u32 queue)
 	}
 	tx_q->dirty_tx = entry;
 
-	netdev_completed_queue(priv->dev, pkts_compl, bytes_compl);
+	netdev_tx_completed_queue(netdev_get_tx_queue(priv->dev, queue),
+				  pkts_compl, bytes_compl);
+
+	if (unlikely(netif_tx_queue_stopped(netdev_get_tx_queue(priv->dev,
+								queue))) &&
+	    stmmac_tx_avail(priv, queue) > STMMAC_TX_THRESH) {
 
-	if (unlikely(netif_queue_stopped(priv->dev) &&
-	    stmmac_tx_avail(priv, queue) > STMMAC_TX_THRESH)) {
 		netif_dbg(priv, tx_done, priv->dev,
 			  "%s: restart transmit\n", __func__);
-		netif_wake_queue(priv->dev);
+		netif_tx_wake_queue(netdev_get_tx_queue(priv->dev, queue));
 	}
 
 	if ((priv->eee_enabled) && (!priv->tx_path_in_lpi_mode)) {
@@ -1843,7 +1903,7 @@ static void stmmac_tx_err(struct stmmac_priv *priv, u32 chan)
 	struct stmmac_tx_queue *tx_q = &priv->tx_queue[chan];
 	int i;
 
-	netif_stop_queue(priv->dev);
+	netif_tx_stop_queue(netdev_get_tx_queue(priv->dev, chan));
 
 	stmmac_stop_tx_dma(priv, chan);
 	dma_free_tx_skbufs(priv, chan);
@@ -1858,11 +1918,11 @@ static void stmmac_tx_err(struct stmmac_priv *priv, u32 chan)
 						     (i == DMA_TX_SIZE - 1));
 	tx_q->dirty_tx = 0;
 	tx_q->cur_tx = 0;
-	netdev_reset_queue(priv->dev);
+	netdev_tx_reset_queue(netdev_get_tx_queue(priv->dev, chan));
 	stmmac_start_tx_dma(priv, chan);
 
 	priv->dev->stats.tx_errors++;
-	netif_wake_queue(priv->dev);
+	netif_tx_wake_queue(netdev_get_tx_queue(priv->dev, chan));
 }
 
 /**
@@ -1907,12 +1967,14 @@ static void stmmac_dma_interrupt(struct stmmac_priv *priv)
 	u32 chan;
 
 	for (chan = 0; chan < tx_channel_count; chan++) {
+		struct stmmac_rx_queue *rx_q = &priv->rx_queue[chan];
+
 		status = priv->hw->dma->dma_interrupt(priv->ioaddr,
 						      &priv->xstats, chan);
 		if (likely((status & handle_rx)) || (status & handle_tx)) {
-			if (likely(napi_schedule_prep(&priv->napi))) {
+			if (likely(napi_schedule_prep(&rx_q->napi))) {
 				stmmac_disable_dma_irq(priv, chan);
-				__napi_schedule(&priv->napi);
+				__napi_schedule(&rx_q->napi);
 			}
 		}
 
@@ -2554,8 +2616,8 @@ static int stmmac_open(struct net_device *dev)
 		}
 	}
 
-	napi_enable(&priv->napi);
-	netif_start_queue(dev);
+	stmmac_enable_all_queues(priv);
+	stmmac_start_all_queues(priv);
 
 	return 0;
 
@@ -2598,9 +2660,9 @@ static int stmmac_release(struct net_device *dev)
 		phy_disconnect(dev->phydev);
 	}
 
-	netif_stop_queue(dev);
+	stmmac_stop_all_queues(priv);
 
-	napi_disable(&priv->napi);
+	stmmac_disable_all_queues(priv);
 
 	del_timer_sync(&priv->txtimer);
 
@@ -2717,8 +2779,9 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
 	/* Desc availability based on threshold should be enough safe */
 	if (unlikely(stmmac_tx_avail(priv, queue) <
 		(((skb->len - proto_hdr_len) / TSO_MAX_BUFF_SIZE + 1)))) {
-		if (!netif_queue_stopped(dev)) {
-			netif_stop_queue(dev);
+		if (!netif_tx_queue_stopped(netdev_get_tx_queue(dev, queue))) {
+			netif_tx_stop_queue(netdev_get_tx_queue(priv->dev,
+								queue));
 			/* This is a hard error, log it. */
 			netdev_err(priv->dev,
 				   "%s: Tx Ring full when queue awake\n",
@@ -2798,7 +2861,7 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (unlikely(stmmac_tx_avail(priv, queue) <= (MAX_SKB_FRAGS + 1))) {
 		netif_dbg(priv, hw, priv->dev, "%s: stop transmitted packets\n",
 			  __func__);
-		netif_stop_queue(dev);
+		netif_tx_stop_queue(netdev_get_tx_queue(priv->dev, queue));
 	}
 
 	dev->stats.tx_bytes += skb->len;
@@ -2855,7 +2918,7 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
 		print_pkt(skb->data, skb_headlen(skb));
 	}
 
-	netdev_sent_queue(dev, skb->len);
+	netdev_tx_sent_queue(netdev_get_tx_queue(dev, queue), skb->len);
 
 	priv->hw->dma->set_tx_tail_ptr(priv->ioaddr, tx_q->tx_tail_addr,
 				       queue);
@@ -2899,8 +2962,9 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 
 	if (unlikely(stmmac_tx_avail(priv, queue) < nfrags + 1)) {
-		if (!netif_queue_stopped(dev)) {
-			netif_stop_queue(dev);
+		if (!netif_tx_queue_stopped(netdev_get_tx_queue(dev, queue))) {
+			netif_tx_stop_queue(netdev_get_tx_queue(priv->dev,
+								queue));
 			/* This is a hard error, log it. */
 			netdev_err(priv->dev,
 				   "%s: Tx Ring full when queue awake\n",
@@ -2998,7 +3062,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (unlikely(stmmac_tx_avail(priv, queue) <= (MAX_SKB_FRAGS + 1))) {
 		netif_dbg(priv, hw, priv->dev, "%s: stop transmitted packets\n",
 			  __func__);
-		netif_stop_queue(dev);
+		netif_tx_stop_queue(netdev_get_tx_queue(priv->dev, queue));
 	}
 
 	dev->stats.tx_bytes += skb->len;
@@ -3061,7 +3125,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 		dma_wmb();
 	}
 
-	netdev_sent_queue(dev, skb->len);
+	netdev_tx_sent_queue(netdev_get_tx_queue(dev, queue), skb->len);
 
 	if (priv->synopsys_id < DWMAC_CORE_4_00)
 		priv->hw->dma->enable_dma_transmission(priv->ioaddr);
@@ -3361,7 +3425,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
 			else
 				skb->ip_summed = CHECKSUM_UNNECESSARY;
 
-			napi_gro_receive(&priv->napi, skb);
+			napi_gro_receive(&rx_q->napi, skb);
 
 			priv->dev->stats.rx_packets++;
 			priv->dev->stats.rx_bytes += frame_len;
@@ -3386,21 +3450,21 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
  */
 static int stmmac_poll(struct napi_struct *napi, int budget)
 {
-	struct stmmac_priv *priv = container_of(napi, struct stmmac_priv, napi);
+	struct stmmac_rx_queue *rx_q =
+		container_of(napi, struct stmmac_rx_queue, napi);
+	struct stmmac_priv *priv = rx_q->priv_data;
 	u32 tx_count = priv->plat->tx_queues_to_use;
-	u32 chan = STMMAC_CHAN0;
+	u32 chan = rx_q->queue_index;
 	int work_done = 0;
-	u32 queue = chan;
+	u32 queue;
 
 	priv->xstats.napi_poll++;
 
 	/* check all the queues */
 	for (queue = 0; queue < tx_count; queue++)
 		stmmac_tx_clean(priv, queue);
 
-	queue = chan;
-
-	work_done = stmmac_rx(priv, budget, queue);
+	work_done = stmmac_rx(priv, budget, rx_q->queue_index);
 	if (work_done < budget) {
 		napi_complete_done(napi, work_done);
 		stmmac_enable_dma_irq(priv, chan);
@@ -3989,11 +4053,14 @@ int stmmac_dvr_probe(struct device *device,
 		     struct plat_stmmacenet_data *plat_dat,
 		     struct stmmac_resources *res)
 {
-	int ret = 0;
 	struct net_device *ndev = NULL;
 	struct stmmac_priv *priv;
+	int ret = 0;
+	u32 queue;
 
-	ndev = alloc_etherdev(sizeof(struct stmmac_priv));
+	ndev = alloc_etherdev_mqs(sizeof(struct stmmac_priv),
+				  MTL_MAX_TX_QUEUES,
+				  MTL_MAX_RX_QUEUES);
 	if (!ndev)
 		return -ENOMEM;
 
@@ -4035,6 +4102,10 @@ int stmmac_dvr_probe(struct device *device,
 	if (ret)
 		goto error_hw_init;
 
+	/* Configure real RX and TX queues */
+	ndev->real_num_rx_queues = priv->plat->rx_queues_to_use;
+	ndev->real_num_tx_queues = priv->plat->tx_queues_to_use;
+
 	ndev->netdev_ops = &stmmac_netdev_ops;
 
 	ndev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
@@ -4084,7 +4155,12 @@ int stmmac_dvr_probe(struct device *device,
 			 "Enable RX Mitigation via HW Watchdog Timer\n");
 	}
 
-	netif_napi_add(ndev, &priv->napi, stmmac_poll, 64);
+	for (queue = 0; queue < priv->plat->rx_queues_to_use; queue++) {
+		struct stmmac_rx_queue *rx_q = &priv->rx_queue[queue];
+
+		netif_napi_add(ndev, &rx_q->napi, stmmac_poll,
+			       (8 * priv->plat->rx_queues_to_use));
+	}
 
 	spin_lock_init(&priv->lock);
 
@@ -4129,7 +4205,11 @@ int stmmac_dvr_probe(struct device *device,
 	    priv->hw->pcs != STMMAC_PCS_RTBI)
 		stmmac_mdio_unregister(ndev);
 error_mdio_register:
-	netif_napi_del(&priv->napi);
+	for (queue = 0; queue < priv->plat->rx_queues_to_use; queue++) {
+		struct stmmac_rx_queue *rx_q = &priv->rx_queue[queue];
+
+		netif_napi_del(&rx_q->napi);
+	}
 error_hw_init:
 	free_netdev(ndev);
 
@@ -4191,9 +4271,9 @@ int stmmac_suspend(struct device *dev)
 	spin_lock_irqsave(&priv->lock, flags);
 
 	netif_device_detach(ndev);
-	netif_stop_queue(ndev);
+	stmmac_stop_all_queues(priv);
 
-	napi_disable(&priv->napi);
+	stmmac_disable_all_queues(priv);
 
 	/* Stop TX/RX DMA */
 	stmmac_stop_all_dma(priv);
@@ -4296,9 +4376,9 @@ int stmmac_resume(struct device *dev)
 	stmmac_init_tx_coalesce(priv);
 	stmmac_set_rx_mode(ndev);
 
-	napi_enable(&priv->napi);
+	stmmac_enable_all_queues(priv);
 
-	netif_start_queue(ndev);
+	stmmac_start_all_queues(priv);
 
 	spin_unlock_irqrestore(&priv->lock, flags);