linux-kernel - Re: [PATCH v2] dccp: put dccp_qpolicy_full() and dccp_qpolicy

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Message-Id: <165938341366.9721.17408043483330420763.git-patchwork-notify@kernel.org>
Date:   Mon, 01 Aug 2022 19:50:13 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Hangyu Hua <hbh25y@...il.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, kuniyu@...zon.co.jp, joannelkoong@...il.com,
        richard_siegfried@...temli.org, socketcan@...tkopp.net,
        ian.mcdonald@...di.co.nz, acme@...driva.com, gerrit@....abdn.ac.uk,
        dccp@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dccp: put dccp_qpolicy_full() and dccp_qpolicy_push() in
 the same lock

Hello:

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

On Fri, 29 Jul 2022 19:00:27 +0800 you wrote:
> In the case of sk->dccps_qpolicy == DCCPQ_POLICY_PRIO, dccp_qpolicy_full
> will drop a skb when qpolicy is full. And the lock in dccp_sendmsg is
> released before sock_alloc_send_skb and then relocked after
> sock_alloc_send_skb. The following conditions may lead dccp_qpolicy_push
> to add skb to an already full sk_write_queue:
> 
> thread1--->lock
> thread1--->dccp_qpolicy_full: queue is full. drop a skb
> thread1--->unlock
> thread2--->lock
> thread2--->dccp_qpolicy_full: queue is not full. no need to drop.
> thread2--->unlock
> thread1--->lock
> thread1--->dccp_qpolicy_push: add a skb. queue is full.
> thread1--->unlock
> thread2--->lock
> thread2--->dccp_qpolicy_push: add a skb!
> thread2--->unlock
> 
> [...]

Here is the summary with links:
  - [v2] dccp: put dccp_qpolicy_full() and dccp_qpolicy_push() in the same lock
    https://git.kernel.org/netdev/net/c/a41b17ff9dac

You are awesome, thank you!
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