[4.19] [Bugfix] 回合上游bugfix af_packet: set defaule value for tmo · Pull Request !3036 · anolis/cloud-kernel

bugzilla: https://bugzilla.openanolis.cn/show_bug.cgi?id=8733

There is softlockup when using TPACKET_V3:
...
NMI watchdog: BUG: soft lockup - CPU#2 stuck for 60010ms!
(__irq_svc) from [] (_raw_spin_unlock_irqrestore+0x44/0x54)
(_raw_spin_unlock_irqrestore) from [] (mod_timer+0x210/0x25c)
(mod_timer) from []
(prb_retire_rx_blk_timer_expired+0x68/0x11c)
(prb_retire_rx_blk_timer_expired) from []
(call_timer_fn+0x90/0x17c)
(call_timer_fn) from [] (run_timer_softirq+0x2d4/0x2fc)
(run_timer_softirq) from [] (__do_softirq+0x218/0x318)
(__do_softirq) from [] (irq_exit+0x88/0xac)
(irq_exit) from [] (msa_irq_exit+0x11c/0x1d4)
(msa_irq_exit) from [] (handle_IPI+0x650/0x7f4)
(handle_IPI) from [] (gic_handle_irq+0x108/0x118)
(gic_handle_irq) from [] (__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%.

类型	指派人员	状态
审查		已完成 (1/0)
测试		已完成 (1/1)

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