[PATCH v7 5/6] igb_uio: use kernel functions for masking MSI-X

[Markus Theil <markus.theil@tu-ilmenau.de>]

This patch removes the custom MSI-X mask/unmask code and
uses already existing kernel functions.

Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
---
 lib/librte_eal/linuxapp/igb_uio/compat.h  | 26 +++++-----------
 lib/librte_eal/linuxapp/igb_uio/igb_uio.c | 51 ++++++++++++-------------------
 2 files changed, 28 insertions(+), 49 deletions(-)

diff --git a/lib/librte_eal/linuxapp/igb_uio/compat.h b/lib/librte_eal/linuxapp/igb_uio/compat.h
index 3825933..67a7ab3 100644
--- a/lib/librte_eal/linuxapp/igb_uio/compat.h
+++ b/lib/librte_eal/linuxapp/igb_uio/compat.h
@@ -15,24 +15,6 @@
 #define HAVE_PTE_MASK_PAGE_IOMAP
 #endif
 
-#ifndef PCI_MSIX_ENTRY_SIZE
-#define PCI_MSIX_ENTRY_SIZE             16
-#define  PCI_MSIX_ENTRY_LOWER_ADDR      0
-#define  PCI_MSIX_ENTRY_UPPER_ADDR      4
-#define  PCI_MSIX_ENTRY_DATA            8
-#define  PCI_MSIX_ENTRY_VECTOR_CTRL     12
-#define   PCI_MSIX_ENTRY_CTRL_MASKBIT   1
-#endif
-
-/*
- * for kernels < 2.6.38 and backported patch that moves MSI-X entry definition
- * to pci_regs.h Those kernels has PCI_MSIX_ENTRY_SIZE defined but not
- * PCI_MSIX_ENTRY_CTRL_MASKBIT
- */
-#ifndef PCI_MSIX_ENTRY_CTRL_MASKBIT
-#define PCI_MSIX_ENTRY_CTRL_MASKBIT    1
-#endif
-
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 34) && \
 	(!(defined(RHEL_RELEASE_CODE) && \
 	 RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(5, 9)))
@@ -127,3 +109,11 @@ static bool pci_check_and_mask_intx(struct pci_dev *pdev)
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0)
 #define HAVE_ALLOC_IRQ_VECTORS 1
 #endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
+#define HAVE_PCI_MSI_MASK_IRQ 1
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)
+#define HAVE_IRQ_DATA 1
+#endif
diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index c570eed..e4ef817 100644
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -91,27 +91,6 @@ static struct attribute *dev_attrs[] = {
 static const struct attribute_group dev_attr_grp = {
 	.attrs = dev_attrs,
 };
-/*
- * It masks the msix on/off of generating MSI-X messages.
- */
-static void
-igbuio_msix_mask_irq(struct msi_desc *desc, int32_t state)
-{
-	u32 mask_bits = desc->masked;
-	unsigned offset = desc->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
-						PCI_MSIX_ENTRY_VECTOR_CTRL;
-
-	if (state != 0)
-		mask_bits &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
-	else
-		mask_bits |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
-
-	if (mask_bits != desc->masked) {
-		writel(mask_bits, desc->mask_base + offset);
-		readl(desc->mask_base);
-		desc->masked = mask_bits;
-	}
-}
 
 /**
  * This is the irqcontrol callback to be registered to uio_info.
@@ -132,21 +111,31 @@ igbuio_pci_irqcontrol(struct uio_info *info, s32 irq_state)
 	struct rte_uio_pci_dev *udev = info->priv;
 	struct pci_dev *pdev = udev->pdev;
 
-	pci_cfg_access_lock(pdev);
-	if (udev->mode == RTE_INTR_MODE_LEGACY)
-		pci_intx(pdev, !!irq_state);
+#ifdef HAVE_IRQ_DATA
+	struct irq_data *irq = irq_get_irq_data(udev->info.irq);
+#else
+	unsigned int irq = udev->info.irq;
+#endif
 
-	else if (udev->mode == RTE_INTR_MODE_MSIX) {
-		struct msi_desc *desc;
+	pci_cfg_access_lock(pdev);
 
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0))
-		list_for_each_entry(desc, &pdev->msi_list, list)
-			igbuio_msix_mask_irq(desc, irq_state);
+	if (udev->mode == RTE_INTR_MODE_MSIX) {
+#ifdef HAVE_PCI_MSI_MASK_IRQ
+		if (irq_state == 1)
+			pci_msi_unmask_irq(irq);
+		else
+			pci_msi_mask_irq(irq);
 #else
-		list_for_each_entry(desc, &pdev->dev.msi_list, list)
-			igbuio_msix_mask_irq(desc, irq_state);
+		if (irq_state == 1)
+			unmask_msi_irq(irq);
+		else
+			mask_msi_irq(irq);
 #endif
 	}
+
+	if (udev->mode == RTE_INTR_MODE_LEGACY)
+		pci_intx(pdev, !!irq_state);
+
 	pci_cfg_access_unlock(pdev);
 
 	return 0;
-- 
2.7.4