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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2015 - 2024 Beijing WangXun Technology Co., Ltd. */
#include <linux/pci.h>
#include "../libwx/wx_type.h"
#include "../libwx/wx_lib.h"
#include "../libwx/wx_hw.h"
#include "txgbe_type.h"
#include "txgbe_irq.h"
/**
* txgbe_irq_enable - Enable default interrupt generation settings
* @wx: pointer to private structure
* @queues: enable irqs for queues
**/
void txgbe_irq_enable(struct wx *wx, bool queues)
{
wr32(wx, WX_PX_MISC_IEN, TXGBE_PX_MISC_IEN_MASK);
/* unmask interrupt */
wx_intr_enable(wx, TXGBE_INTR_MISC);
if (queues)
wx_intr_enable(wx, TXGBE_INTR_QALL(wx));
}
/**
* txgbe_intr - msi/legacy mode Interrupt Handler
* @irq: interrupt number
* @data: pointer to a network interface device structure
**/
static irqreturn_t txgbe_intr(int __always_unused irq, void *data)
{
struct wx_q_vector *q_vector;
struct wx *wx = data;
struct pci_dev *pdev;
u32 eicr;
q_vector = wx->q_vector[0];
pdev = wx->pdev;
eicr = wx_misc_isb(wx, WX_ISB_VEC0);
if (!eicr) {
/* shared interrupt alert!
* the interrupt that we masked before the ICR read.
*/
if (netif_running(wx->netdev))
txgbe_irq_enable(wx, true);
return IRQ_NONE; /* Not our interrupt */
}
wx->isb_mem[WX_ISB_VEC0] = 0;
if (!(pdev->msi_enabled))
wr32(wx, WX_PX_INTA, 1);
wx->isb_mem[WX_ISB_MISC] = 0;
/* would disable interrupts here but it is auto disabled */
napi_schedule_irqoff(&q_vector->napi);
/* re-enable link(maybe) and non-queue interrupts, no flush.
* txgbe_poll will re-enable the queue interrupts
*/
if (netif_running(wx->netdev))
txgbe_irq_enable(wx, false);
return IRQ_HANDLED;
}
/**
* txgbe_request_msix_irqs - Initialize MSI-X interrupts
* @wx: board private structure
*
* Allocate MSI-X vectors and request interrupts from the kernel.
**/
static int txgbe_request_msix_irqs(struct wx *wx)
{
struct net_device *netdev = wx->netdev;
int vector, err;
for (vector = 0; vector < wx->num_q_vectors; vector++) {
struct wx_q_vector *q_vector = wx->q_vector[vector];
struct msix_entry *entry = &wx->msix_q_entries[vector];
if (q_vector->tx.ring && q_vector->rx.ring)
snprintf(q_vector->name, sizeof(q_vector->name) - 1,
"%s-TxRx-%d", netdev->name, entry->entry);
else
/* skip this unused q_vector */
continue;
err = request_irq(entry->vector, wx_msix_clean_rings, 0,
q_vector->name, q_vector);
if (err) {
wx_err(wx, "request_irq failed for MSIX interrupt %s Error: %d\n",
q_vector->name, err);
goto free_queue_irqs;
}
}
return 0;
free_queue_irqs:
while (vector) {
vector--;
free_irq(wx->msix_q_entries[vector].vector,
wx->q_vector[vector]);
}
wx_reset_interrupt_capability(wx);
return err;
}
/**
* txgbe_request_irq - initialize interrupts
* @wx: board private structure
*
* Attempt to configure interrupts using the best available
* capabilities of the hardware and kernel.
**/
int txgbe_request_irq(struct wx *wx)
{
struct net_device *netdev = wx->netdev;
struct pci_dev *pdev = wx->pdev;
int err;
if (pdev->msix_enabled)
err = txgbe_request_msix_irqs(wx);
else if (pdev->msi_enabled)
err = request_irq(wx->pdev->irq, &txgbe_intr, 0,
netdev->name, wx);
else
err = request_irq(wx->pdev->irq, &txgbe_intr, IRQF_SHARED,
netdev->name, wx);
if (err)
wx_err(wx, "request_irq failed, Error %d\n", err);
return err;
}
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