Re: [PATCH v3] net/sched: netem: account for backlog updates from child qdisc

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@xxxxxxxxxx>:

On Tue, 10 Dec 2024 14:14:11 +0100 you wrote:
> In general, 'qlen' of any classful qdisc should keep track of the
> number of packets that the qdisc itself and all of its children holds.
> In case of netem, 'qlen' only accounts for the packets in its internal
> tfifo. When netem is used with a child qdisc, the child qdisc can use
> 'qdisc_tree_reduce_backlog' to inform its parent, netem, about created
> or dropped SKBs. This function updates 'qlen' and the backlog statistics
> of netem, but netem does not account for changes made by a child qdisc.
> 'qlen' then indicates the wrong number of packets in the tfifo.
> If a child qdisc creates new SKBs during enqueue and informs its parent
> about this, netem's 'qlen' value is increased. When netem dequeues the
> newly created SKBs from the child, the 'qlen' in netem is not updated.
> If 'qlen' reaches the configured sch->limit, the enqueue function stops
> working, even though the tfifo is not full.
> 
> [...]

Here is the summary with links:
  - [v3] net/sched: netem: account for backlog updates from child qdisc
    https://git.kernel.org/netdev/net/c/f8d4bc455047

You are awesome, thank you!
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