igb_uio: add MSI IRQ mode

[dpdk.git] / lib / librte_eal / linuxapp / igb_uio / igb_uio.c

diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index e4ef817..b578c4a 100644 (file)
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -119,7 +119,7 @@ igbuio_pci_irqcontrol(struct uio_info *info, s32 irq_state)
 
        pci_cfg_access_lock(pdev);
 
-       if (udev->mode == RTE_INTR_MODE_MSIX) {
+       if (udev->mode == RTE_INTR_MODE_MSIX || udev->mode == RTE_INTR_MODE_MSI) {
 #ifdef HAVE_PCI_MSI_MASK_IRQ
                if (irq_state == 1)
                        pci_msi_unmask_irq(irq);
@@ -325,6 +325,25 @@ igbuio_pci_enable_interrupts(struct rte_uio_pci_dev *udev)
                        udev->mode = RTE_INTR_MODE_MSIX;
                        break;
                }
+#endif
+       /* fall back to MSI */
+       case RTE_INTR_MODE_MSI:
+#ifndef HAVE_ALLOC_IRQ_VECTORS
+               if (pci_enable_msi(udev->pdev) == 0) {
+                       dev_dbg(&udev->pdev->dev, "using MSI");
+                       udev->info.irq_flags = IRQF_NO_THREAD;
+                       udev->info.irq = udev->pdev->irq;
+                       udev->mode = RTE_INTR_MODE_MSI;
+                       break;
+               }
+#else
+               if (pci_alloc_irq_vectors(udev->pdev, 1, 1, PCI_IRQ_MSI) == 1) {
+                       dev_dbg(&udev->pdev->dev, "using MSI");
+                       udev->info.irq_flags = IRQF_NO_THREAD;
+                       udev->info.irq = pci_irq_vector(udev->pdev, 0);
+                       udev->mode = RTE_INTR_MODE_MSI;
+                       break;
+               }
 #endif
        /* fall back to INTX */
        case RTE_INTR_MODE_LEGACY:
@@ -336,7 +355,7 @@ igbuio_pci_enable_interrupts(struct rte_uio_pci_dev *udev)
                        break;
                }
                dev_notice(&udev->pdev->dev, "PCI INTX mask not supported\n");
-               /* fall back to no IRQ */
+       /* fall back to no IRQ */
        case RTE_INTR_MODE_NONE:
                udev->mode = RTE_INTR_MODE_NONE;
                udev->info.irq = 0;
@@ -357,8 +376,11 @@ igbuio_pci_disable_interrupts(struct rte_uio_pci_dev *udev)
 #ifndef HAVE_ALLOC_IRQ_VECTORS
        if (udev->mode == RTE_INTR_MODE_MSIX)
                pci_disable_msix(udev->pdev);
+       if (udev->mode == RTE_INTR_MODE_MSI)
+               pci_disable_msi(udev->pdev);
 #else
-       if (udev->mode == RTE_INTR_MODE_MSIX)
+       if (udev->mode == RTE_INTR_MODE_MSIX ||
+           udev->mode == RTE_INTR_MODE_MSI)
                pci_free_irq_vectors(udev->pdev);
 #endif
 }
@@ -544,6 +566,9 @@ igbuio_config_intr_mode(char *intr_str)
        if (!strcmp(intr_str, RTE_INTR_MODE_MSIX_NAME)) {
                igbuio_intr_mode_preferred = RTE_INTR_MODE_MSIX;
                pr_info("Use MSIX interrupt\n");
+       } else if (!strcmp(intr_str, RTE_INTR_MODE_MSI_NAME)) {
+               igbuio_intr_mode_preferred = RTE_INTR_MODE_MSI;
+               pr_info("Use MSI interrupt\n");
        } else if (!strcmp(intr_str, RTE_INTR_MODE_LEGACY_NAME)) {
                igbuio_intr_mode_preferred = RTE_INTR_MODE_LEGACY;
                pr_info("Use legacy interrupt\n");
@@ -587,6 +612,7 @@ module_param(intr_mode, charp, S_IRUGO);
 MODULE_PARM_DESC(intr_mode,
 "igb_uio interrupt mode (default=msix):\n"
 "    " RTE_INTR_MODE_MSIX_NAME "       Use MSIX interrupt\n"
+"    " RTE_INTR_MODE_MSI_NAME "        Use MSI interrupt\n"
 "    " RTE_INTR_MODE_LEGACY_NAME "     Use Legacy interrupt\n"
 "\n");