Re: [PATCH net-next v13 0/5] tun/tap & vhost-net: apply qdisc backpressure on full ptr_ring to reduce TX drops

On 7/30/26 23:36, Simon Schippers wrote:

This patch series deals with tun/tap & vhost-net which drop incoming
SKBs whenever their internal ptr_ring buffer is full. Instead, with this
patch series, the associated netdev queue is stopped, but only when the
new IFF_BACKPRESSURE flag is set and a qdisc is attached. Without the
flag, or if no qdisc is present, the existing behavior is preserved. The
XDP transmit path is not affected. This patch series touches tun/tap and
vhost-net, as they share common logic and must be updated together.
Modifying only one of them would break the other.

Sashiko found valid regressions, even though the code stayed the same.

I will address them and send a v14 soon.