netdev - Re: [PATCH net-next v3 2/3] net: sched: Make tc-related drop reason more flexible for remaining qdiscs

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Message-ID: <20231213130807.503e1332@kernel.org>
Date: Wed, 13 Dec 2023 13:08:07 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: Jamal Hadi Salim <hadi@...atatu.com>, Eric Dumazet
 <edumazet@...gle.com>, Victor Nogueira <victor@...atatu.com>,
 xiyou.wangcong@...il.com, jiri@...nulli.us, davem@...emloft.net,
 pabeni@...hat.com, daniel@...earbox.net, dcaratti@...hat.com,
 netdev@...r.kernel.org, kernel@...atatu.com
Subject: Re: [PATCH net-next v3 2/3] net: sched: Make tc-related drop reason
 more flexible for remaining qdiscs

On Wed, 13 Dec 2023 13:36:31 -0500 Jamal Hadi Salim wrote:
> Putting this to rest:
> Other than fq codel, the others that deal with multiple skbs due to
> gso segments. So the conclusion is:  if we have a bunch in the list
> then they all suffer the same fate. So a single reason for the list is
> sufficient.

Alright.

I'm still a bit confused about the cb, tho.

struct qdisc_skb_cb is the state struct.
But we put the drop reason in struct tc_skb_cb.
How does that work. Qdiscs will assume they own all of
qdisc_skb_cb::data ?

Maybe some documentation about the lifetimes of these things
would clarify things?