forked from Minki/linux
net: bcmgenet: fix throughtput regression
This patch adds bcmgenet_tx_poll for the tx_rings. This can reduce the
interrupt load and send xmit in network stack on time. This also
separated for the completion of tx_ring16 from bcmgenet_poll.
The bcmgenet_tx_reclaim of tx_ring[{0,1,2,3}] operative by an interrupt
is to be not more than a certain number TxBDs. It is caused by too
slowly reclaiming the transmitted skb. Therefore, performance
degradation of xmit after 605ad7f ("tcp: refine TSO autosizing").
Signed-off-by: Jaedon Shin <jaedon.shin@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jaedon Shin
David S. Miller
parent
2f1d8b9e8a
commit
4092e6acf5
@ -971,13 +971,14 @@ static inline void bcmgenet_tx_ring_int_disable(struct bcmgenet_priv *priv,
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}
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/* Unlocked version of the reclaim routine */
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static void __bcmgenet_tx_reclaim(struct net_device *dev,
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struct bcmgenet_tx_ring *ring)
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static unsigned int __bcmgenet_tx_reclaim(struct net_device *dev,
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struct bcmgenet_tx_ring *ring)
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{
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struct bcmgenet_priv *priv = netdev_priv(dev);
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int last_tx_cn, last_c_index, num_tx_bds;
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struct enet_cb *tx_cb_ptr;
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struct netdev_queue *txq;
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unsigned int pkts_compl = 0;
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unsigned int bds_compl;
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unsigned int c_index;
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@ -1005,6 +1006,7 @@ static void __bcmgenet_tx_reclaim(struct net_device *dev,
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tx_cb_ptr = ring->cbs + last_c_index;
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bds_compl = 0;
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if (tx_cb_ptr->skb) {
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pkts_compl++;
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bds_compl = skb_shinfo(tx_cb_ptr->skb)->nr_frags + 1;
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dev->stats.tx_bytes += tx_cb_ptr->skb->len;
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dma_unmap_single(&dev->dev,
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@ -1028,23 +1030,45 @@ static void __bcmgenet_tx_reclaim(struct net_device *dev,
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last_c_index &= (num_tx_bds - 1);
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}
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if (ring->free_bds > (MAX_SKB_FRAGS + 1))
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ring->int_disable(priv, ring);
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if (netif_tx_queue_stopped(txq))
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netif_tx_wake_queue(txq);
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if (ring->free_bds > (MAX_SKB_FRAGS + 1)) {
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if (netif_tx_queue_stopped(txq))
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netif_tx_wake_queue(txq);
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}
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ring->c_index = c_index;
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return pkts_compl;
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}
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static void bcmgenet_tx_reclaim(struct net_device *dev,
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static unsigned int bcmgenet_tx_reclaim(struct net_device *dev,
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struct bcmgenet_tx_ring *ring)
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{
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unsigned int released;
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unsigned long flags;
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spin_lock_irqsave(&ring->lock, flags);
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__bcmgenet_tx_reclaim(dev, ring);
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released = __bcmgenet_tx_reclaim(dev, ring);
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spin_unlock_irqrestore(&ring->lock, flags);
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return released;
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}
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static int bcmgenet_tx_poll(struct napi_struct *napi, int budget)
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{
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struct bcmgenet_tx_ring *ring =
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container_of(napi, struct bcmgenet_tx_ring, napi);
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unsigned int work_done = 0;
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work_done = bcmgenet_tx_reclaim(ring->priv->dev, ring);
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if (work_done == 0) {
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napi_complete(napi);
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ring->int_enable(ring->priv, ring);
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return 0;
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}
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return budget;
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}
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static void bcmgenet_tx_reclaim_all(struct net_device *dev)
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@ -1302,10 +1326,8 @@ static netdev_tx_t bcmgenet_xmit(struct sk_buff *skb, struct net_device *dev)
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bcmgenet_tdma_ring_writel(priv, ring->index,
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ring->prod_index, TDMA_PROD_INDEX);
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if (ring->free_bds <= (MAX_SKB_FRAGS + 1)) {
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if (ring->free_bds <= (MAX_SKB_FRAGS + 1))
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netif_tx_stop_queue(txq);
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ring->int_enable(priv, ring);
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}
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out:
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spin_unlock_irqrestore(&ring->lock, flags);
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@ -1621,6 +1643,7 @@ static int init_umac(struct bcmgenet_priv *priv)
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struct device *kdev = &priv->pdev->dev;
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int ret;
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u32 reg, cpu_mask_clear;
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int index;
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dev_dbg(&priv->pdev->dev, "bcmgenet: init_umac\n");
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@ -1647,7 +1670,7 @@ static int init_umac(struct bcmgenet_priv *priv)
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bcmgenet_intr_disable(priv);
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cpu_mask_clear = UMAC_IRQ_RXDMA_BDONE;
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cpu_mask_clear = UMAC_IRQ_RXDMA_BDONE | UMAC_IRQ_TXDMA_BDONE;
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dev_dbg(kdev, "%s:Enabling RXDMA_BDONE interrupt\n", __func__);
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@ -1674,6 +1697,10 @@ static int init_umac(struct bcmgenet_priv *priv)
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bcmgenet_intrl2_0_writel(priv, cpu_mask_clear, INTRL2_CPU_MASK_CLEAR);
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for (index = 0; index < priv->hw_params->tx_queues; index++)
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bcmgenet_intrl2_1_writel(priv, (1 << index),
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INTRL2_CPU_MASK_CLEAR);
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/* Enable rx/tx engine.*/
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dev_dbg(kdev, "done init umac\n");
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@ -1693,6 +1720,8 @@ static void bcmgenet_init_tx_ring(struct bcmgenet_priv *priv,
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unsigned int first_bd;
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spin_lock_init(&ring->lock);
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ring->priv = priv;
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netif_napi_add(priv->dev, &ring->napi, bcmgenet_tx_poll, 64);
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ring->index = index;
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if (index == DESC_INDEX) {
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ring->queue = 0;
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@ -1738,6 +1767,17 @@ static void bcmgenet_init_tx_ring(struct bcmgenet_priv *priv,
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TDMA_WRITE_PTR);
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bcmgenet_tdma_ring_writel(priv, index, end_ptr * words_per_bd - 1,
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DMA_END_ADDR);
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napi_enable(&ring->napi);
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}
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static void bcmgenet_fini_tx_ring(struct bcmgenet_priv *priv,
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unsigned int index)
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{
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struct bcmgenet_tx_ring *ring = &priv->tx_rings[index];
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napi_disable(&ring->napi);
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netif_napi_del(&ring->napi);
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}
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/* Initialize a RDMA ring */
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@ -1907,7 +1947,7 @@ static int bcmgenet_dma_teardown(struct bcmgenet_priv *priv)
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return ret;
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}
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static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
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static void __bcmgenet_fini_dma(struct bcmgenet_priv *priv)
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{
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int i;
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@ -1926,6 +1966,18 @@ static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
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kfree(priv->tx_cbs);
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}
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static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
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{
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int i;
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bcmgenet_fini_tx_ring(priv, DESC_INDEX);
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for (i = 0; i < priv->hw_params->tx_queues; i++)
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bcmgenet_fini_tx_ring(priv, i);
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__bcmgenet_fini_dma(priv);
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}
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/* init_edma: Initialize DMA control register */
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static int bcmgenet_init_dma(struct bcmgenet_priv *priv)
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{
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@ -1952,7 +2004,7 @@ static int bcmgenet_init_dma(struct bcmgenet_priv *priv)
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priv->tx_cbs = kcalloc(priv->num_tx_bds, sizeof(struct enet_cb),
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GFP_KERNEL);
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if (!priv->tx_cbs) {
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bcmgenet_fini_dma(priv);
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__bcmgenet_fini_dma(priv);
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return -ENOMEM;
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}
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@ -1975,9 +2027,6 @@ static int bcmgenet_poll(struct napi_struct *napi, int budget)
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struct bcmgenet_priv, napi);
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unsigned int work_done;
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/* tx reclaim */
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bcmgenet_tx_reclaim(priv->dev, &priv->tx_rings[DESC_INDEX]);
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work_done = bcmgenet_desc_rx(priv, budget);
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/* Advancing our consumer index*/
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@ -2022,28 +2071,34 @@ static void bcmgenet_irq_task(struct work_struct *work)
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static irqreturn_t bcmgenet_isr1(int irq, void *dev_id)
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{
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struct bcmgenet_priv *priv = dev_id;
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struct bcmgenet_tx_ring *ring;
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unsigned int index;
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/* Save irq status for bottom-half processing. */
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priv->irq1_stat =
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bcmgenet_intrl2_1_readl(priv, INTRL2_CPU_STAT) &
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~priv->int1_mask;
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~bcmgenet_intrl2_1_readl(priv, INTRL2_CPU_MASK_STATUS);
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/* clear interrupts */
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bcmgenet_intrl2_1_writel(priv, priv->irq1_stat, INTRL2_CPU_CLEAR);
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netif_dbg(priv, intr, priv->dev,
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"%s: IRQ=0x%x\n", __func__, priv->irq1_stat);
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/* Check the MBDONE interrupts.
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* packet is done, reclaim descriptors
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*/
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if (priv->irq1_stat & 0x0000ffff) {
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index = 0;
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for (index = 0; index < 16; index++) {
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if (priv->irq1_stat & (1 << index))
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bcmgenet_tx_reclaim(priv->dev,
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&priv->tx_rings[index]);
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for (index = 0; index < priv->hw_params->tx_queues; index++) {
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if (!(priv->irq1_stat & BIT(index)))
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continue;
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ring = &priv->tx_rings[index];
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if (likely(napi_schedule_prep(&ring->napi))) {
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ring->int_disable(priv, ring);
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__napi_schedule(&ring->napi);
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}
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}
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return IRQ_HANDLED;
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}
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@ -2075,8 +2130,12 @@ static irqreturn_t bcmgenet_isr0(int irq, void *dev_id)
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}
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if (priv->irq0_stat &
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(UMAC_IRQ_TXDMA_BDONE | UMAC_IRQ_TXDMA_PDONE)) {
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/* Tx reclaim */
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bcmgenet_tx_reclaim(priv->dev, &priv->tx_rings[DESC_INDEX]);
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struct bcmgenet_tx_ring *ring = &priv->tx_rings[DESC_INDEX];
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if (likely(napi_schedule_prep(&ring->napi))) {
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ring->int_disable(priv, ring);
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__napi_schedule(&ring->napi);
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}
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}
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if (priv->irq0_stat & (UMAC_IRQ_PHY_DET_R |
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UMAC_IRQ_PHY_DET_F |
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@ -520,6 +520,7 @@ struct bcmgenet_hw_params {
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struct bcmgenet_tx_ring {
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spinlock_t lock; /* ring lock */
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struct napi_struct napi; /* NAPI per tx queue */
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unsigned int index; /* ring index */
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unsigned int queue; /* queue index */
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struct enet_cb *cbs; /* tx ring buffer control block*/
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@ -534,6 +535,7 @@ struct bcmgenet_tx_ring {
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struct bcmgenet_tx_ring *);
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void (*int_disable)(struct bcmgenet_priv *priv,
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struct bcmgenet_tx_ring *);
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struct bcmgenet_priv *priv;
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};
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/* device context */
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