netdev - Re: bonding reports interface up with 0 Mbps

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Date:	Thu, 04 Feb 2016 12:29:33 -0800
From:	Jay Vosburgh <jay.vosburgh@...onical.com>
To:	"Tantilov, Emil S" <emil.s.tantilov@...el.com>
cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...ulusnetworks.com" <gospo@...ulusnetworks.com>,
	zhuyj <zyjzyj2000@...il.com>,
	"jiri@...lanox.com" <jiri@...lanox.com>
Subject: Re: bonding reports interface up with 0 Mbps

Tantilov, Emil S <emil.s.tantilov@...el.com> wrote:

>We are seeing an occasional issue where the bonding driver may report interface up with 0 Mbps:
>bond0: link status definitely up for interface eth0, 0 Mbps full duplex
>
>So far in all the failed traces I have collected this happens on NETDEV_CHANGELOWERSTATE event:
>
><...>-20533 [000] .... 81811.041241: ixgbe_service_task: eth1: NIC Link is Up 10 Gbps, Flow Control: RX/TX
><...>-20533 [000] .... 81811.041257: ixgbe_check_vf_rate_limit <-ixgbe_service_task
><...>-20533 [000] .... 81811.041272: ixgbe_ping_all_vfs <-ixgbe_service_task
>kworker/u48:0-7503  [010] .... 81811.041345: ixgbe_get_stats64 <-dev_get_stats
>kworker/u48:0-7503  [010] .... 81811.041393: bond_netdev_event: eth1: event: 1b
>kworker/u48:0-7503  [010] .... 81811.041394: bond_netdev_event: eth1: IFF_SLAVE
>kworker/u48:0-7503  [010] .... 81811.041395: bond_netdev_event: eth1: slave->speed = ffffffff
><...>-20533 [000] .... 81811.041407: ixgbe_ptp_overflow_check <-ixgbe_service_task
>kworker/u48:0-7503  [010] .... 81811.041407: bond_mii_monitor: bond0: link status definitely up for interface eth1, 0 Mbps full duplex

	Thinking about the trace again... Emil: what happens in the
trace before this?  Is there ever a call to the ixgbe_get_settings?
Does a NETDEV_UP or NETDEV_CHANGE event ever hit the bond_netdev_event
function?

	Could you describe your test that reproduces this?  I'd like to
see if I can set it up locally.

	-J

---
	-Jay Vosburgh, jay.vosburgh@...onical.com