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[4/7] vhost: fix NUMA reallocation with multiqueue

Message ID 20210617105845.125472-5-maxime.coquelin@redhat.com (mailing list archive)
State Superseded, archived
Delegated to: Maxime Coquelin
Headers show
Series vhost: Fix and improve NUMA reallocation | expand


Context Check Description
ci/checkpatch success coding style OK

Commit Message

Maxime Coquelin June 17, 2021, 10:58 a.m. UTC
Since the Vhost-user device initialization has been reworked,
enabling the application to start using the device as soon as
the first queue pair is ready, NUMA reallocation no more
happened on queue pairs other than the first one since
numa_realloc() was returning early if the device was running.

This patch fixes this issue by only preventing the device
metadata to be allocated if the device is running. For the
virtqueues, a vring state change notification is sent to
notify the application of its disablement. Since the callback
is supposed to be blocking, it is safe to reallocate it

Fixes: d0fcc38f5fa4 ("vhost: improve device readiness notifications")
Cc: stable@dpdk.org

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
 lib/vhost/vhost_user.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)
diff mbox series


diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
index 0e9e26ebe0..6e7b327ef8 100644
--- a/lib/vhost/vhost_user.c
+++ b/lib/vhost/vhost_user.c
@@ -488,9 +488,6 @@  numa_realloc(struct virtio_net *dev, int index)
 	struct batch_copy_elem *new_batch_copy_elems;
 	int ret;
-	if (dev->flags & VIRTIO_DEV_RUNNING)
-		return dev;
 	old_dev = dev;
 	vq = old_vq = dev->virtqueue[index];
@@ -506,6 +503,11 @@  numa_realloc(struct virtio_net *dev, int index)
 		return dev;
 	if (oldnode != newnode) {
+		if (vq->ready) {
+			vq->ready = false;
+			vhost_user_notify_queue_state(dev, index, 0);
+		}
 			"reallocate vq from %d to %d node\n", oldnode, newnode);
 		vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode);
@@ -558,6 +560,9 @@  numa_realloc(struct virtio_net *dev, int index)
+	if (dev->flags & VIRTIO_DEV_RUNNING)
+		goto out;
 	/* check if we need to reallocate dev */
 	ret = get_mempolicy(&oldnode, NULL, 0, old_dev,