Since xsk's TX queue is consumed by TX NAPI, if sq is bound to xsk, then
we must stop tx napi from being disabled.
Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/net/virtio_net.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 35fd8bca7fcf..2767338dc060 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -4738,7 +4738,7 @@ static int virtnet_set_coalesce(struct net_device *dev,
struct netlink_ext_ack *extack)
{
struct virtnet_info *vi = netdev_priv(dev);
- int ret, queue_number, napi_weight;
+ int ret, queue_number, napi_weight, i;
bool update_napi = false;
/* Can't change NAPI weight if the link is up */
@@ -4767,6 +4767,14 @@ static int virtnet_set_coalesce(struct net_device *dev,
return ret;
if (update_napi) {
+ /* xsk xmit depends on the tx napi. So if xsk is active,
+ * prevent modifications to tx napi.
+ */
+ for (i = queue_number; i < vi->max_queue_pairs; i++) {
+ if (vi->sq[i].xsk.pool)
+ return -EBUSY;
+ }
+
for (; queue_number < vi->max_queue_pairs; queue_number++)
vi->sq[queue_number].napi.weight = napi_weight;
}
--
2.32.0.3.g01195cf9f
