diff options
| -rw-r--r-- | drivers/net/e1000/e1000_main.c | 90 |
1 files changed, 88 insertions, 2 deletions
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c index fe22ae8f0a3..35e4e32c770 100644 --- a/drivers/net/e1000/e1000_main.c +++ b/drivers/net/e1000/e1000_main.c @@ -157,6 +157,9 @@ static struct net_device_stats * e1000_get_stats(struct net_device *netdev); static int e1000_change_mtu(struct net_device *netdev, int new_mtu); static int e1000_set_mac(struct net_device *netdev, void *p); static irqreturn_t e1000_intr(int irq, void *data); +#ifdef CONFIG_PCI_MSI +static irqreturn_t e1000_intr_msi(int irq, void *data); +#endif static boolean_t e1000_clean_tx_irq(struct e1000_adapter *adapter, struct e1000_tx_ring *tx_ring); #ifdef CONFIG_E1000_NAPI @@ -288,7 +291,7 @@ static int e1000_request_irq(struct e1000_adapter *adapter) flags = IRQF_SHARED; #ifdef CONFIG_PCI_MSI - if (adapter->hw.mac_type > e1000_82547_rev_2) { + if (adapter->hw.mac_type >= e1000_82571) { adapter->have_msi = TRUE; if ((err = pci_enable_msi(adapter->pdev))) { DPRINTK(PROBE, ERR, @@ -296,8 +299,14 @@ static int e1000_request_irq(struct e1000_adapter *adapter) adapter->have_msi = FALSE; } } - if (adapter->have_msi) + if (adapter->have_msi) { flags &= ~IRQF_SHARED; + err = request_irq(adapter->pdev->irq, &e1000_intr_msi, flags, + netdev->name, netdev); + if (err) + DPRINTK(PROBE, ERR, + "Unable to allocate interrupt Error: %d\n", err); + } else #endif if ((err = request_irq(adapter->pdev->irq, &e1000_intr, flags, netdev->name, netdev))) @@ -3466,6 +3475,83 @@ e1000_update_stats(struct e1000_adapter *adapter) spin_unlock_irqrestore(&adapter->stats_lock, flags); } +#ifdef CONFIG_PCI_MSI + +/** + * e1000_intr_msi - Interrupt Handler + * @irq: interrupt number + * @data: pointer to a network interface device structure + **/ + +static +irqreturn_t e1000_intr_msi(int irq, void *data) +{ + struct net_device *netdev = data; + struct e1000_adapter *adapter = netdev_priv(netdev); + struct e1000_hw *hw = &adapter->hw; +#ifndef CONFIG_E1000_NAPI + int i; +#endif + + /* this code avoids the read of ICR but has to get 1000 interrupts + * at every link change event before it will notice the change */ + if (++adapter->detect_link >= 1000) { + uint32_t icr = E1000_READ_REG(hw, ICR); +#ifdef CONFIG_E1000_NAPI + /* read ICR disables interrupts using IAM, so keep up with our + * enable/disable accounting */ + atomic_inc(&adapter->irq_sem); +#endif + adapter->detect_link = 0; + if ((icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) && + (icr & E1000_ICR_INT_ASSERTED)) { + hw->get_link_status = 1; + /* 80003ES2LAN workaround-- + * For packet buffer work-around on link down event; + * disable receives here in the ISR and + * reset adapter in watchdog + */ + if (netif_carrier_ok(netdev) && + (adapter->hw.mac_type == e1000_80003es2lan)) { + /* disable receives */ + uint32_t rctl = E1000_READ_REG(hw, RCTL); + E1000_WRITE_REG(hw, RCTL, rctl & ~E1000_RCTL_EN); + } + /* guard against interrupt when we're going down */ + if (!test_bit(__E1000_DOWN, &adapter->flags)) + mod_timer(&adapter->watchdog_timer, + jiffies + 1); + } + } else { + E1000_WRITE_REG(hw, ICR, (0xffffffff & ~(E1000_ICR_RXSEQ | + E1000_ICR_LSC))); + /* bummer we have to flush here, but things break otherwise as + * some event appears to be lost or delayed and throughput + * drops. In almost all tests this flush is un-necessary */ + E1000_WRITE_FLUSH(hw); +#ifdef CONFIG_E1000_NAPI + /* Interrupt Auto-Mask (IAM)...upon writing ICR, interrupts are + * masked. No need for the IMC write, but it does mean we + * should account for it ASAP. */ + atomic_inc(&adapter->irq_sem); +#endif + } + +#ifdef CONFIG_E1000_NAPI + if (likely(netif_rx_schedule_prep(netdev))) + __netif_rx_schedule(netdev); + else + e1000_irq_enable(adapter); +#else + for (i = 0; i < E1000_MAX_INTR; i++) + if (unlikely(!adapter->clean_rx(adapter, adapter->rx_ring) & + !e1000_clean_tx_irq(adapter, adapter->tx_ring))) + break; +#endif + + return IRQ_HANDLED; +} +#endif /** * e1000_intr - Interrupt Handler |