From: "Toke Høiland-Jørgensen" <toke@toke.dk>
To: Jakub Kicinski <kuba@kernel.org>
Cc: jhs@mojatatu.com, xiyou.wangcong@gmail.com, jiri@resnulli.us,
davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, cake@lists.bufferbloat.net,
netdev@vger.kernel.org
Subject: Re: [PATCH net] sch_cake: Return __NET_XMIT_STOLEN when consuming enqueued skb
Date: Thu, 01 Sep 2022 00:13:24 +0200 [thread overview]
Message-ID: <87wnao2ha3.fsf@toke.dk> (raw)
In-Reply-To: <166198321517.20200.12054704879498725145.git-patchwork-notify@kernel.org>
patchwork-bot+netdevbpf@kernel.org writes:
> Hello:
>
> This patch was applied to netdev/net.git (master)
> by Jakub Kicinski <kuba@kernel.org>:
>
> On Wed, 31 Aug 2022 11:21:03 +0200 you wrote:
>> When the GSO splitting feature of sch_cake is enabled, GSO superpackets
>> will be broken up and the resulting segments enqueued in place of the
>> original skb. In this case, CAKE calls consume_skb() on the original skb,
>> but still returns NET_XMIT_SUCCESS. This can confuse parent qdiscs into
>> assuming the original skb still exists, when it really has been freed. Fix
>> this by adding the __NET_XMIT_STOLEN flag to the return value in this case.
>>
>> [...]
>
> Here is the summary with links:
> - [net] sch_cake: Return __NET_XMIT_STOLEN when consuming enqueued skb
> https://git.kernel.org/netdev/net/c/90fabae8a2c2
Ah, crossed streams (just sent v2[0]).
Hmm, okay, so as noted in the changelog to v2, just this patch will
break htb+cake (because htb will now skip htb_activate()); do you prefer
that I send a follow-up to fix HTB in this mode, or to revert this and
apply the fix to sfb in v2 instead?
-Toke
[0] https://lore.kernel.org/r/20220831215219.499563-1-toke@toke.dk
next prev parent reply other threads:[~2022-08-31 22:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-31 9:21 [PATCH net] sch_cake: Return __NET_XMIT_STOLEN when consuming enqueued skb Toke Høiland-Jørgensen
2022-08-31 17:08 ` Eric Dumazet
2022-08-31 21:31 ` Toke Høiland-Jørgensen
2022-08-31 21:52 ` [PATCH net v2] sch_sfb: Don't assume the skb is still around after enqueueing to child Toke Høiland-Jørgensen
2022-09-02 11:30 ` patchwork-bot+netdevbpf
2022-09-05 17:55 ` Cong Wang
2022-09-05 19:05 ` Toke Høiland-Jørgensen
2022-08-31 22:00 ` [PATCH net] sch_cake: Return __NET_XMIT_STOLEN when consuming enqueued skb patchwork-bot+netdevbpf
2022-08-31 22:13 ` Toke Høiland-Jørgensen [this message]
2022-09-01 3:07 ` Jakub Kicinski
2022-09-01 9:20 ` Toke Høiland-Jørgensen
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