[PATCH net-next v3 14/27] virtio_net: xsk: prevent disable tx napi

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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/main.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
index 2b11a94c8d5a..180153dba4f2 100644
--- a/drivers/net/virtio/main.c
+++ b/drivers/net/virtio/main.c
@@ -3296,7 +3296,7 @@ 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 */
@@ -3325,6 +3325,14 @@ 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





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