From: Mao Wenan <maowenan@huawei.com>
To: <davem@davemloft.net>, <loke.chetan@gmail.com>,
<willemb@google.com>, <edumazet@google.com>,
<maximmi@mellanox.com>, <nhorman@tuxdriver.com>,
<pabeni@redhat.com>, <maowenan@huawei.com>,
<yuehaibing@huawei.com>, <tglx@linutronix.de>
Cc: <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<kernel-janitors@vger.kernel.org>,
Xiao Jiangfeng <xiaojiangfeng@huawei.com>
Subject: [PATCH net] af_packet: set defaule value for tmo
Date: Mon, 9 Dec 2019 21:31:25 +0800 [thread overview]
Message-ID: <20191209133125.59093-1-maowenan@huawei.com> (raw)
There is softlockup when using TPACKET_V3:
...
NMI watchdog: BUG: soft lockup - CPU#2 stuck for 60010ms!
(__irq_svc) from [<c0558a0c>] (_raw_spin_unlock_irqrestore+0x44/0x54)
(_raw_spin_unlock_irqrestore) from [<c027b7e8>] (mod_timer+0x210/0x25c)
(mod_timer) from [<c0549c30>]
(prb_retire_rx_blk_timer_expired+0x68/0x11c)
(prb_retire_rx_blk_timer_expired) from [<c027a7ac>]
(call_timer_fn+0x90/0x17c)
(call_timer_fn) from [<c027ab6c>] (run_timer_softirq+0x2d4/0x2fc)
(run_timer_softirq) from [<c021eaf4>] (__do_softirq+0x218/0x318)
(__do_softirq) from [<c021eea0>] (irq_exit+0x88/0xac)
(irq_exit) from [<c0240130>] (msa_irq_exit+0x11c/0x1d4)
(msa_irq_exit) from [<c0209cf0>] (handle_IPI+0x650/0x7f4)
(handle_IPI) from [<c02015bc>] (gic_handle_irq+0x108/0x118)
(gic_handle_irq) from [<c0558ee4>] (__irq_usr+0x44/0x5c)
...
If __ethtool_get_link_ksettings() is failed in
prb_calc_retire_blk_tmo(), msec and tmo will be zero, so tov_in_jiffies
is zero and the timer expire for retire_blk_timer is turn to
mod_timer(&pkc->retire_blk_timer, jiffies + 0),
which will trigger cpu usage of softirq is 100%.
Fixes: f6fb8f100b80 ("af-packet: TPACKET_V3 flexible buffer implementation.")
Tested-by: Xiao Jiangfeng <xiaojiangfeng@huawei.com>
Signed-off-by: Mao Wenan <maowenan@huawei.com>
---
net/packet/af_packet.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 53c1d41fb1c9..118cd66b7516 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -544,7 +544,8 @@ static int prb_calc_retire_blk_tmo(struct packet_sock *po,
msec = 1;
div = ecmd.base.speed / 1000;
}
- }
+ } else
+ return DEFAULT_PRB_RETIRE_TOV;
mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
--
2.20.1
next reply other threads:[~2019-12-09 13:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-09 13:31 Mao Wenan [this message]
2019-12-09 14:14 ` [PATCH net] af_packet: set defaule value for tmo walter harms
2019-12-09 22:31 ` David Miller
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