Commit ad5c5690 authored by Zhu Lingshan's avatar Zhu Lingshan Committed by Michael S. Tsirkin
Browse files

vDPA/ifcvf: implement device MSIX vector allocator 



This commit implements a MSIX vector allocation helper
for vqs and config interrupts.

Signed-off-by: default avatarZhu Lingshan <lingshan.zhu@intel.com>
Link: https://lore.kernel.org/r/20220222115428.998334-4-lingshan.zhu@intel.com


Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent cce0ab2b

drivers/vdpa/ifcvf/ifcvf_main.c

+26 −5
Original line number Diff line number Diff line
@@ -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;