From: Benjamin Herrenschmidt Date: Wed, 5 Apr 2017 02:28:53 +0000 (+1000) Subject: ftgmac100: Rework NAPI & interrupts handling X-Git-Tag: v4.12-rc1~108^2~228^2 X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-linux.git;a=commitdiff_plain;h=10cbd640760991b8563dbe1d94160641fa6287b7 ftgmac100: Rework NAPI & interrupts handling First, don't look at the interrupt status in the poll loop to decide what to poll. It's wrong. If we have run out of budget, we may still have RX packets to unqueue but no more RX interrupt pending. So instead move the code looking at the interrupt status into the interrupt handler where it belongs. That avoids a slow MMIO read in the NAPI fast path. We keep the abnormal interrupts enabled while NAPI is scheduled. While at it, actually do something useful in the "error" cases: On AHB bus error, trigger the new reset task, that's about all we can do. On RX packet fifo or descriptor overflows, we need to restart the MAC after having freed things up. So set a flag that NAPI will see and use to perform that restart after harvesting the RX ring. Finally, we shouldn't complete NAPI if there are still outgoing packets that will need harvesting. Waiting for more interrupts is less efficient than letting NAPI run a while longer while the queue drains. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c index 6625012d734e..20fc7c8d1a50 100644 --- a/drivers/net/ethernet/faraday/ftgmac100.c +++ b/drivers/net/ethernet/faraday/ftgmac100.c @@ -85,7 +85,7 @@ struct ftgmac100 { bool use_ncsi; /* Misc */ - int int_mask_all; + bool need_mac_restart; }; static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv, @@ -1048,10 +1048,49 @@ static irqreturn_t ftgmac100_interrupt(int irq, void *dev_id) { struct net_device *netdev = dev_id; struct ftgmac100 *priv = netdev_priv(netdev); + unsigned int status, new_mask = FTGMAC100_INT_BAD; - /* Disable interrupts for polling */ - iowrite32(0, priv->base + FTGMAC100_OFFSET_IER); - napi_schedule(&priv->napi); + /* Fetch and clear interrupt bits, process abnormal ones */ + status = ioread32(priv->base + FTGMAC100_OFFSET_ISR); + iowrite32(status, priv->base + FTGMAC100_OFFSET_ISR); + if (unlikely(status & FTGMAC100_INT_BAD)) { + + /* RX buffer unavailable */ + if (status & FTGMAC100_INT_NO_RXBUF) + netdev->stats.rx_over_errors++; + + /* received packet lost due to RX FIFO full */ + if (status & FTGMAC100_INT_RPKT_LOST) + netdev->stats.rx_fifo_errors++; + + /* sent packet lost due to excessive TX collision */ + if (status & FTGMAC100_INT_XPKT_LOST) + netdev->stats.tx_fifo_errors++; + + /* AHB error -> Reset the chip */ + if (status & FTGMAC100_INT_AHB_ERR) { + if (net_ratelimit()) + netdev_warn(netdev, + "AHB bus error ! Resetting chip.\n"); + iowrite32(0, priv->base + FTGMAC100_OFFSET_IER); + schedule_work(&priv->reset_task); + return IRQ_HANDLED; + } + + /* We may need to restart the MAC after such errors, delay + * this until after we have freed some Rx buffers though + */ + priv->need_mac_restart = true; + + /* Disable those errors until we restart */ + new_mask &= ~status; + } + + /* Only enable "bad" interrupts while NAPI is on */ + iowrite32(new_mask, priv->base + FTGMAC100_OFFSET_IER); + + /* Schedule NAPI bh */ + napi_schedule_irqoff(&priv->napi); return IRQ_HANDLED; } @@ -1059,68 +1098,51 @@ static irqreturn_t ftgmac100_interrupt(int irq, void *dev_id) static int ftgmac100_poll(struct napi_struct *napi, int budget) { struct ftgmac100 *priv = container_of(napi, struct ftgmac100, napi); - struct net_device *netdev = priv->netdev; - unsigned int status; - bool completed = true; + bool more, completed = true; int rx = 0; - status = ioread32(priv->base + FTGMAC100_OFFSET_ISR); - iowrite32(status, priv->base + FTGMAC100_OFFSET_ISR); - - if (status & (FTGMAC100_INT_RPKT_BUF | FTGMAC100_INT_NO_RXBUF)) { - /* - * FTGMAC100_INT_RPKT_BUF: - * RX DMA has received packets into RX buffer successfully - * - * FTGMAC100_INT_NO_RXBUF: - * RX buffer unavailable - */ - bool retry; + ftgmac100_tx_complete(priv); - do { - retry = ftgmac100_rx_packet(priv, &rx); - } while (retry && rx < budget); + do { + more = ftgmac100_rx_packet(priv, &rx); + } while (more && rx < budget); - if (retry && rx == budget) - completed = false; - } + if (more && rx == budget) + completed = false; - if (status & (FTGMAC100_INT_XPKT_ETH | FTGMAC100_INT_XPKT_LOST)) { - /* - * FTGMAC100_INT_XPKT_ETH: - * packet transmitted to ethernet successfully - * - * FTGMAC100_INT_XPKT_LOST: - * packet transmitted to ethernet lost due to late - * collision or excessive collision - */ - ftgmac100_tx_complete(priv); - } - - if (status & priv->int_mask_all & (FTGMAC100_INT_NO_RXBUF | - FTGMAC100_INT_RPKT_LOST | FTGMAC100_INT_AHB_ERR)) { - if (net_ratelimit()) - netdev_info(netdev, "[ISR] = 0x%x: %s%s%s\n", status, - status & FTGMAC100_INT_NO_RXBUF ? "NO_RXBUF " : "", - status & FTGMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "", - status & FTGMAC100_INT_AHB_ERR ? "AHB_ERR " : ""); - if (status & FTGMAC100_INT_NO_RXBUF) { - /* RX buffer unavailable */ - netdev->stats.rx_over_errors++; - } + /* The interrupt is telling us to kick the MAC back to life + * after an RX overflow + */ + if (unlikely(priv->need_mac_restart)) { + ftgmac100_start_hw(priv); - if (status & FTGMAC100_INT_RPKT_LOST) { - /* received packet lost due to RX FIFO full */ - netdev->stats.rx_fifo_errors++; - } + /* Re-enable "bad" interrupts */ + iowrite32(FTGMAC100_INT_BAD, + priv->base + FTGMAC100_OFFSET_IER); } + /* Keep NAPI going if we have still packets to reclaim */ + if (priv->tx_pending) + return budget; + if (completed) { + /* We are about to re-enable all interrupts. However + * the HW has been latching RX/TX packet interrupts while + * they were masked. So we clear them first, then we need + * to re-check if there's something to process + */ + iowrite32(FTGMAC100_INT_RXTX, + priv->base + FTGMAC100_OFFSET_ISR); + if (ftgmac100_rxdes_packet_ready + (ftgmac100_current_rxdes(priv)) || priv->tx_pending) + return budget; + + /* deschedule NAPI */ napi_complete(napi); /* enable all interrupts */ - iowrite32(priv->int_mask_all, + iowrite32(FTGMAC100_INT_ALL, priv->base + FTGMAC100_OFFSET_IER); } @@ -1148,7 +1170,7 @@ static int ftgmac100_init_all(struct ftgmac100 *priv, bool ignore_alloc_err) netif_start_queue(priv->netdev); /* Enable all interrupts */ - iowrite32(priv->int_mask_all, priv->base + FTGMAC100_OFFSET_IER); + iowrite32(FTGMAC100_INT_ALL, priv->base + FTGMAC100_OFFSET_IER); return err; } @@ -1491,13 +1513,6 @@ static int ftgmac100_probe(struct platform_device *pdev) /* MAC address from chip or random one */ ftgmac100_setup_mac(priv); - priv->int_mask_all = (FTGMAC100_INT_RPKT_LOST | - FTGMAC100_INT_XPKT_ETH | - FTGMAC100_INT_XPKT_LOST | - FTGMAC100_INT_AHB_ERR | - FTGMAC100_INT_RPKT_BUF | - FTGMAC100_INT_NO_RXBUF); - if (of_machine_is_compatible("aspeed,ast2400") || of_machine_is_compatible("aspeed,ast2500")) { priv->rxdes0_edorr_mask = BIT(30); diff --git a/drivers/net/ethernet/faraday/ftgmac100.h b/drivers/net/ethernet/faraday/ftgmac100.h index a7ce0ac8858a..c4d5cc11062f 100644 --- a/drivers/net/ethernet/faraday/ftgmac100.h +++ b/drivers/net/ethernet/faraday/ftgmac100.h @@ -86,6 +86,20 @@ #define FTGMAC100_INT_PHYSTS_CHG (1 << 9) #define FTGMAC100_INT_NO_HPTXBUF (1 << 10) +/* Interrupts we care about in NAPI mode */ +#define FTGMAC100_INT_BAD (FTGMAC100_INT_RPKT_LOST | \ + FTGMAC100_INT_XPKT_LOST | \ + FTGMAC100_INT_AHB_ERR | \ + FTGMAC100_INT_NO_RXBUF) + +/* Normal RX/TX interrupts, enabled when NAPI off */ +#define FTGMAC100_INT_RXTX (FTGMAC100_INT_XPKT_ETH | \ + FTGMAC100_INT_RPKT_BUF) + +/* All the interrupts we care about */ +#define FTGMAC100_INT_ALL (FTGMAC100_INT_RPKT_BUF | \ + FTGMAC100_INT_BAD) + /* * Interrupt timer control register */