virtio: Make vp_set_vq_affinity() take a mask.

Make vp_set_vq_affinity() take a cpumask instead of taking a single CPU.

If there are fewer queues than cores, queue affinity should be able to
map to multiple cores.

Link: https://patchwork.ozlabs.org/patch/948149/
Suggested-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Caleb Raitto <caraitto@google.com>
Acked-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/crypto/virtio/virtio_crypto_core.c

@@ -146,7 +146,7 @@ static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
 
 	if (vi->affinity_hint_set) {
 		for (i = 0; i < vi->max_data_queues; i++)
-			virtqueue_set_affinity(vi->data_vq[i].vq, -1);
+			virtqueue_set_affinity(vi->data_vq[i].vq, NULL);
 
 		vi->affinity_hint_set = false;
 	}
@@ -173,7 +173,7 @@ static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
 	 *
 	 */
 	for_each_online_cpu(cpu) {
-		virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpu);
+		virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpumask_of(cpu));
 		if (++i >= vcrypto->max_data_queues)
 			break;
 	}

drivers/net/virtio_net.c

@@ -1878,8 +1878,8 @@ static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
 
 	if (vi->affinity_hint_set) {
 		for (i = 0; i < vi->max_queue_pairs; i++) {
-			virtqueue_set_affinity(vi->rq[i].vq, -1);
-			virtqueue_set_affinity(vi->sq[i].vq, -1);
+			virtqueue_set_affinity(vi->rq[i].vq, NULL);
+			virtqueue_set_affinity(vi->sq[i].vq, NULL);
 		}
 
 		vi->affinity_hint_set = false;
@@ -1905,8 +1905,8 @@ static void virtnet_set_affinity(struct virtnet_info *vi)
 	for_each_online_cpu(cpu) {
 		const unsigned long *mask = cpumask_bits(cpumask_of(cpu));
 
-		virtqueue_set_affinity(vi->rq[i].vq, cpu);
-		virtqueue_set_affinity(vi->sq[i].vq, cpu);
+		virtqueue_set_affinity(vi->rq[i].vq, cpumask_of(cpu));
+		virtqueue_set_affinity(vi->sq[i].vq, cpumask_of(cpu));
 		__netif_set_xps_queue(vi->dev, mask, i, false);
 		i++;
 	}

drivers/virtio/virtio_pci_common.c

@@ -421,7 +421,7 @@ const char *vp_bus_name(struct virtio_device *vdev)
  * - OR over all affinities for shared MSI
  * - ignore the affinity request if we're using INTX
  */
-int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
+int vp_set_vq_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask)
 {
 	struct virtio_device *vdev = vq->vdev;
 	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
@@ -435,11 +435,10 @@ int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
 	if (vp_dev->msix_enabled) {
 		mask = vp_dev->msix_affinity_masks[info->msix_vector];
 		irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector);
-		if (cpu == -1)
+		if (!cpu_mask)
 			irq_set_affinity_hint(irq, NULL);
 		else {
-			cpumask_clear(mask);
-			cpumask_set_cpu(cpu, mask);
+			cpumask_copy(mask, cpu_mask);
 			irq_set_affinity_hint(irq, mask);
 		}
 	}

drivers/virtio/virtio_pci_common.h

@@ -141,7 +141,7 @@ const char *vp_bus_name(struct virtio_device *vdev);
  * - OR over all affinities for shared MSI
  * - ignore the affinity request if we're using INTX
  */
-int vp_set_vq_affinity(struct virtqueue *vq, int cpu);
+int vp_set_vq_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask);
 
 const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index);
 

include/linux/virtio_config.h

@@ -79,7 +79,8 @@ struct virtio_config_ops {
 	u64 (*get_features)(struct virtio_device *vdev);
 	int (*finalize_features)(struct virtio_device *vdev);
 	const char *(*bus_name)(struct virtio_device *vdev);
-	int (*set_vq_affinity)(struct virtqueue *vq, int cpu);
+	int (*set_vq_affinity)(struct virtqueue *vq,
+			       const struct cpumask *cpu_mask);
 	const struct cpumask *(*get_vq_affinity)(struct virtio_device *vdev,
 			int index);
 };
@@ -236,11 +237,11 @@ const char *virtio_bus_name(struct virtio_device *vdev)
  *
  */
 static inline
-int virtqueue_set_affinity(struct virtqueue *vq, int cpu)
+int virtqueue_set_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask)
 {
 	struct virtio_device *vdev = vq->vdev;
 	if (vdev->config->set_vq_affinity)
-		return vdev->config->set_vq_affinity(vq, cpu);
+		return vdev->config->set_vq_affinity(vq, cpu_mask);
 	return 0;
 }