Re: [PATCH net-next v14 0/5] tun/tap & vhost-net: apply qdisc backpressure on full ptr_ring to reduce TX drops

[Simon Schippers]

On 8/3/26 20:36, 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 is happy now.

Gemini reports in patch 2:
"[Severity: Medium]
Will vhost-net bypass this wrapper and cause permanent TX queue stalls when
IFF_BACKPRESSURE is enabled?"
... but this is added in patch 3. It just cant cross-reference it.
So it is fine.