netdev - Re: [PATCH net] tcp_bbr: fix u32 wrap bug in round logic if bbr

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Date:   Wed, 11 Aug 2021 22:10:05 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Neal Cardwell <ncardwell@...gle.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, ycheng@...gle.com,
        yyd@...gle.com
Subject: Re: [PATCH net] tcp_bbr: fix u32 wrap bug in round logic if bbr_init()
 called after 2B packets

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Tue, 10 Aug 2021 22:40:56 -0400 you wrote:
> Currently if BBR congestion control is initialized after more than 2B
> packets have been delivered, depending on the phase of the
> tp->delivered counter the tracking of BBR round trips can get stuck.
> 
> The bug arises because if tp->delivered is between 2^31 and 2^32 at
> the time the BBR congestion control module is initialized, then the
> initialization of bbr->next_rtt_delivered to 0 will cause the logic to
> believe that the end of the round trip is still billions of packets in
> the future. More specifically, the following check will fail
> repeatedly:
> 
> [...]

Here is the summary with links:
  - [net] tcp_bbr: fix u32 wrap bug in round logic if bbr_init() called after 2B packets
    https://git.kernel.org/netdev/net/c/6de035fec045

You are awesome, thank you!
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