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authorZhu Lingshan <lingshan.zhu@intel.com>2022-02-22 19:54:26 +0800
committerMichael S. Tsirkin <mst@redhat.com>2022-03-28 16:52:57 -0400
commitad5c5690de57f0bd3888ecade4685d4181a4e85c (patch)
tree52d527429f6c51b662b5ebda20129411b50c90b0 /drivers/vdpa
parentcce0ab2b2a39072d81f98017f7b076f3410ef740 (diff)
vDPA/ifcvf: implement device MSIX vector allocator
This commit implements a MSIX vector allocation helper for vqs and config interrupts. Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com> Link: https://lore.kernel.org/r/20220222115428.998334-4-lingshan.zhu@intel.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vdpa')
-rw-r--r--drivers/vdpa/ifcvf/ifcvf_main.c31
1 files changed, 26 insertions, 5 deletions
diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index 43b7180256c6..964f7ac142ba 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -58,23 +58,44 @@ static void ifcvf_free_irq(struct ifcvf_adapter *adapter, int queues)
ifcvf_free_irq_vectors(pdev);
}
-static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
+/* ifcvf MSIX vectors allocator, this helper tries to allocate
+ * vectors for all virtqueues and the config interrupt.
+ * It returns the number of allocated vectors, negative
+ * return value when fails.
+ */
+static int ifcvf_alloc_vectors(struct ifcvf_adapter *adapter)
{
struct pci_dev *pdev = adapter->pdev;
struct ifcvf_hw *vf = &adapter->vf;
- int vector, i, ret, irq;
- u16 max_intr;
+ int max_intr, ret;
/* all queues and config interrupt */
max_intr = vf->nr_vring + 1;
+ ret = pci_alloc_irq_vectors(pdev, 1, max_intr, PCI_IRQ_MSIX | PCI_IRQ_AFFINITY);
- ret = pci_alloc_irq_vectors(pdev, max_intr,
- max_intr, PCI_IRQ_MSIX);
if (ret < 0) {
IFCVF_ERR(pdev, "Failed to alloc IRQ vectors\n");
return ret;
}
+ if (ret < max_intr)
+ IFCVF_INFO(pdev,
+ "Requested %u vectors, however only %u allocated, lower performance\n",
+ max_intr, ret);
+
+ return ret;
+}
+
+static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
+{
+ struct pci_dev *pdev = adapter->pdev;
+ struct ifcvf_hw *vf = &adapter->vf;
+ int vector, nvectors, i, ret, irq;
+
+ nvectors = ifcvf_alloc_vectors(adapter);
+ if (nvectors <= 0)
+ return -EFAULT;
+
snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n",
pci_name(pdev));
vector = 0;