From 9b471446cb376e2d1a4ceb4695059acfc3437f32 Mon Sep 17 00:00:00 2001 From: Jesse Brandeburg Date: Thu, 3 Dec 2009 11:33:54 +0000 Subject: [PATCH] ixgbe: use EIAM to automask MSI-X when disabling interrupts, driver was writing with IO, this is no necessary because on ixgbe parts the hardware can "oneshot" disable and clear the interrupt. So on 82598/82599 use of EIAM should avoid one posted write per interrupt when in MSI-X mode. This should improve performance and seems to in my limited testing, reduce CPU utilization VERY slightly. Signed-off-by: Jesse Brandeburg Acked-by: Peter P Waskiewicz Jr Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- drivers/net/ixgbe/ixgbe_main.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-) diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c index db05030a30ec..247ed2a24769 100644 --- a/drivers/net/ixgbe/ixgbe_main.c +++ b/drivers/net/ixgbe/ixgbe_main.c @@ -1329,8 +1329,7 @@ static irqreturn_t ixgbe_msix_clean_tx(int irq, void *data) r_idx + 1); } - /* disable interrupts on this vector only */ - ixgbe_irq_disable_queues(adapter, ((u64)1 << q_vector->v_idx)); + /* EIAM disabled interrupts (on this vector) for us */ napi_schedule(&q_vector->napi); return IRQ_HANDLED; @@ -1362,7 +1361,7 @@ static irqreturn_t ixgbe_msix_clean_rx(int irq, void *data) return IRQ_HANDLED; /* disable interrupts on this vector only */ - ixgbe_irq_disable_queues(adapter, ((u64)1 << q_vector->v_idx)); + /* EIAM disabled interrupts (on this vector) for us */ napi_schedule(&q_vector->napi); return IRQ_HANDLED; @@ -1397,8 +1396,7 @@ static irqreturn_t ixgbe_msix_clean_many(int irq, void *data) r_idx + 1); } - /* disable interrupts on this vector only */ - ixgbe_irq_disable_queues(adapter, ((u64)1 << q_vector->v_idx)); + /* EIAM disabled interrupts (on this vector) for us */ napi_schedule(&q_vector->napi); return IRQ_HANDLED; @@ -2716,7 +2714,22 @@ static int ixgbe_up_complete(struct ixgbe_adapter *adapter) IXGBE_WRITE_REG(hw, IXGBE_GPIE, gpie); } - if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED)) { + if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) { + /* + * use EIAM to auto-mask when MSI-X interrupt is asserted + * this saves a register write for every interrupt + */ + switch (hw->mac.type) { + case ixgbe_mac_82598EB: + IXGBE_WRITE_REG(hw, IXGBE_EIAM, IXGBE_EICS_RTX_QUEUE); + break; + default: + case ixgbe_mac_82599EB: + IXGBE_WRITE_REG(hw, IXGBE_EIAM_EX(0), 0xFFFFFFFF); + IXGBE_WRITE_REG(hw, IXGBE_EIAM_EX(1), 0xFFFFFFFF); + break; + } + } else { /* legacy interrupts, use EIAM to auto-mask when reading EICR, * specifically only auto mask tx and rx interrupts */ IXGBE_WRITE_REG(hw, IXGBE_EIAM, IXGBE_EICS_RTX_QUEUE); -- 2.20.1