netdev - Re: [PATCH net v2] xfrm: Reinject transport-mode packets through workqueue

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Date:   Thu, 29 Sep 2022 06:39:47 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Liu Jian <liujian56@...wei.com>
CC:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH net v2] xfrm: Reinject transport-mode packets through
 workqueue

On Sat, Sep 24, 2022 at 04:01:57PM +0800, Liu Jian wrote:
> The following warning is displayed when the tcp6-multi-diffip11 stress
> test case of the LTP test suite is tested:
> 
> watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [ns-tcpserver:48198]
> CPU: 0 PID: 48198 Comm: ns-tcpserver Kdump: loaded Not tainted 6.0.0-rc6+ #39
> Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
> pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : des3_ede_encrypt+0x27c/0x460 [libdes]
> lr : 0x3f
> sp : ffff80000ceaa1b0
> x29: ffff80000ceaa1b0 x28: ffff0000df056100 x27: ffff0000e51e5280
> x26: ffff80004df75030 x25: ffff0000e51e4600 x24: 000000000000003b
> x23: 0000000000802080 x22: 000000000000003d x21: 0000000000000038
> x20: 0000000080000020 x19: 000000000000000a x18: 0000000000000033
> x17: ffff0000e51e4780 x16: ffff80004e2d1448 x15: ffff80004e2d1248
> x14: ffff0000e51e4680 x13: ffff80004e2d1348 x12: ffff80004e2d1548
> x11: ffff80004e2d1848 x10: ffff80004e2d1648 x9 : ffff80004e2d1748
> x8 : ffff80004e2d1948 x7 : 000000000bcaf83d x6 : 000000000000001b
> x5 : ffff80004e2d1048 x4 : 00000000761bf3bf x3 : 000000007f1dd0a3
> x2 : ffff0000e51e4780 x1 : ffff0000e3b9a2f8 x0 : 00000000db44e872
> Call trace:

...

> The tasklet software interrupt takes too much time. Therefore, the
> xfrm_trans_reinject executor is changed from tasklet to workqueue. Add add
> spin lock to protect the queue. This reduces the processing flow of the
> tcp_sendmsg function in this scenario.
> 
> Fixes: acf568ee859f0 ("xfrm: Reinject transport-mode packets through tasklet")
> Signed-off-by: Liu Jian <liujian56@...wei.com>

Applied, thanks!