diff options
author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2015-09-25 16:09:36 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2015-09-29 18:51:40 (GMT) |
commit | 12bb03b436dad56692e9a103ed26156156bef5d2 (patch) | |
tree | feb55201ac2fab088173d595e6b7218d72c9efc1 /drivers | |
parent | 2502d0ef272da7058ef303b849a2c8dc324c2e2e (diff) | |
download | linux-12bb03b436dad56692e9a103ed26156156bef5d2.tar.xz |
net: mvneta: Handle per-cpu interrupts
Now that our interrupt controller is allowing us to use per-CPU interrupts,
actually use it in the mvneta driver.
This involves obviously reworking the driver to have a CPU-local NAPI
structure, and report for incoming packet using that structure.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/net/ethernet/marvell/mvneta.c | 91 |
1 files changed, 62 insertions, 29 deletions
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index 8c6f307..d0b710a 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -285,7 +285,21 @@ struct mvneta_pcpu_stats { u64 tx_bytes; }; +struct mvneta_pcpu_port { + /* Pointer to the shared port */ + struct mvneta_port *pp; + + /* Pointer to the CPU-local NAPI struct */ + struct napi_struct napi; + + /* Cause of the previous interrupt */ + u32 cause_rx_tx; +}; + struct mvneta_port { + struct mvneta_pcpu_port __percpu *ports; + struct mvneta_pcpu_stats __percpu *stats; + int pkt_size; unsigned int frag_size; void __iomem *base; @@ -293,15 +307,11 @@ struct mvneta_port { struct mvneta_tx_queue *txqs; struct net_device *dev; - u32 cause_rx_tx; - struct napi_struct napi; - /* Core clock */ struct clk *clk; u8 mcast_count[256]; u16 tx_ring_size; u16 rx_ring_size; - struct mvneta_pcpu_stats *stats; struct mii_bus *mii_bus; struct phy_device *phy_dev; @@ -1461,6 +1471,7 @@ static void mvneta_rxq_drop_pkts(struct mvneta_port *pp, static int mvneta_rx(struct mvneta_port *pp, int rx_todo, struct mvneta_rx_queue *rxq) { + struct mvneta_pcpu_port *port = this_cpu_ptr(pp->ports); struct net_device *dev = pp->dev; int rx_done; u32 rcvd_pkts = 0; @@ -1515,7 +1526,7 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo, skb->protocol = eth_type_trans(skb, dev); mvneta_rx_csum(pp, rx_status, skb); - napi_gro_receive(&pp->napi, skb); + napi_gro_receive(&port->napi, skb); rcvd_pkts++; rcvd_bytes += rx_bytes; @@ -1550,7 +1561,7 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo, mvneta_rx_csum(pp, rx_status, skb); - napi_gro_receive(&pp->napi, skb); + napi_gro_receive(&port->napi, skb); } if (rcvd_pkts) { @@ -2061,12 +2072,11 @@ static void mvneta_set_rx_mode(struct net_device *dev) /* Interrupt handling - the callback for request_irq() */ static irqreturn_t mvneta_isr(int irq, void *dev_id) { - struct mvneta_port *pp = (struct mvneta_port *)dev_id; + struct mvneta_pcpu_port *port = (struct mvneta_pcpu_port *)dev_id; - /* Mask all interrupts */ - mvreg_write(pp, MVNETA_INTR_NEW_MASK, 0); + disable_percpu_irq(port->pp->dev->irq); - napi_schedule(&pp->napi); + napi_schedule(&port->napi); return IRQ_HANDLED; } @@ -2104,11 +2114,11 @@ static int mvneta_poll(struct napi_struct *napi, int budget) { int rx_done = 0; u32 cause_rx_tx; - unsigned long flags; struct mvneta_port *pp = netdev_priv(napi->dev); + struct mvneta_pcpu_port *port = this_cpu_ptr(pp->ports); if (!netif_running(pp->dev)) { - napi_complete(napi); + napi_complete(&port->napi); return rx_done; } @@ -2135,7 +2145,7 @@ static int mvneta_poll(struct napi_struct *napi, int budget) /* For the case where the last mvneta_poll did not process all * RX packets */ - cause_rx_tx |= pp->cause_rx_tx; + cause_rx_tx |= port->cause_rx_tx; if (rxq_number > 1) { while ((cause_rx_tx & MVNETA_RX_INTR_MASK_ALL) && (budget > 0)) { int count; @@ -2166,16 +2176,11 @@ static int mvneta_poll(struct napi_struct *napi, int budget) if (budget > 0) { cause_rx_tx = 0; - napi_complete(napi); - local_irq_save(flags); - mvreg_write(pp, MVNETA_INTR_NEW_MASK, - MVNETA_RX_INTR_MASK(rxq_number) | - MVNETA_TX_INTR_MASK(txq_number) | - MVNETA_MISCINTR_INTR_MASK); - local_irq_restore(flags); + napi_complete(&port->napi); + enable_percpu_irq(pp->dev->irq, 0); } - pp->cause_rx_tx = cause_rx_tx; + port->cause_rx_tx = cause_rx_tx; return rx_done; } @@ -2424,6 +2429,8 @@ static int mvneta_setup_txqs(struct mvneta_port *pp) static void mvneta_start_dev(struct mvneta_port *pp) { + unsigned int cpu; + mvneta_max_rx_size_set(pp, pp->pkt_size); mvneta_txq_max_tx_size_set(pp, pp->pkt_size); @@ -2431,7 +2438,11 @@ static void mvneta_start_dev(struct mvneta_port *pp) mvneta_port_enable(pp); /* Enable polling on the port */ - napi_enable(&pp->napi); + for_each_present_cpu(cpu) { + struct mvneta_pcpu_port *port = per_cpu_ptr(pp->ports, cpu); + + napi_enable(&port->napi); + } /* Unmask interrupts */ mvreg_write(pp, MVNETA_INTR_NEW_MASK, @@ -2449,9 +2460,15 @@ static void mvneta_start_dev(struct mvneta_port *pp) static void mvneta_stop_dev(struct mvneta_port *pp) { + unsigned int cpu; + phy_stop(pp->phy_dev); - napi_disable(&pp->napi); + for_each_present_cpu(cpu) { + struct mvneta_pcpu_port *port = per_cpu_ptr(pp->ports, cpu); + + napi_disable(&port->napi); + } netif_carrier_off(pp->dev); @@ -2709,8 +2726,8 @@ static int mvneta_open(struct net_device *dev) goto err_cleanup_rxqs; /* Connect to port interrupt line */ - ret = request_irq(pp->dev->irq, mvneta_isr, 0, - MVNETA_DRIVER_NAME, pp); + ret = request_percpu_irq(pp->dev->irq, mvneta_isr, + MVNETA_DRIVER_NAME, pp->ports); if (ret) { netdev_err(pp->dev, "cannot request irq %d\n", pp->dev->irq); goto err_cleanup_txqs; @@ -2730,7 +2747,7 @@ static int mvneta_open(struct net_device *dev) return 0; err_free_irq: - free_irq(pp->dev->irq, pp); + free_percpu_irq(pp->dev->irq, pp->ports); err_cleanup_txqs: mvneta_cleanup_txqs(pp); err_cleanup_rxqs: @@ -2745,7 +2762,7 @@ static int mvneta_stop(struct net_device *dev) mvneta_stop_dev(pp); mvneta_mdio_remove(pp); - free_irq(dev->irq, pp); + free_percpu_irq(dev->irq, pp->ports); mvneta_cleanup_rxqs(pp); mvneta_cleanup_txqs(pp); @@ -3032,6 +3049,7 @@ static int mvneta_probe(struct platform_device *pdev) const char *managed; int phy_mode; int err; + int cpu; /* Our multiqueue support is not complete, so for now, only * allow the usage of the first RX queue @@ -3107,11 +3125,18 @@ static int mvneta_probe(struct platform_device *pdev) goto err_clk; } + /* Alloc per-cpu port structure */ + pp->ports = alloc_percpu(struct mvneta_pcpu_port); + if (!pp->ports) { + err = -ENOMEM; + goto err_clk; + } + /* Alloc per-cpu stats */ pp->stats = netdev_alloc_pcpu_stats(struct mvneta_pcpu_stats); if (!pp->stats) { err = -ENOMEM; - goto err_clk; + goto err_free_ports; } dt_mac_addr = of_get_mac_address(dn); @@ -3152,7 +3177,12 @@ static int mvneta_probe(struct platform_device *pdev) if (dram_target_info) mvneta_conf_mbus_windows(pp, dram_target_info); - netif_napi_add(dev, &pp->napi, mvneta_poll, NAPI_POLL_WEIGHT); + for_each_present_cpu(cpu) { + struct mvneta_pcpu_port *port = per_cpu_ptr(pp->ports, cpu); + + netif_napi_add(dev, &port->napi, mvneta_poll, NAPI_POLL_WEIGHT); + port->pp = pp; + } dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO; dev->hw_features |= dev->features; @@ -3183,6 +3213,8 @@ static int mvneta_probe(struct platform_device *pdev) err_free_stats: free_percpu(pp->stats); +err_free_ports: + free_percpu(pp->ports); err_clk: clk_disable_unprepare(pp->clk); err_put_phy_node: @@ -3202,6 +3234,7 @@ static int mvneta_remove(struct platform_device *pdev) unregister_netdev(dev); clk_disable_unprepare(pp->clk); + free_percpu(pp->ports); free_percpu(pp->stats); irq_dispose_mapping(dev->irq); of_node_put(pp->phy_node); |