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Date: Thu, 7 Jan 2016 15:47:13 +0800
From: zhuyj <zyjzyj2000@...il.com>
To: "Tantilov, Emil S" <emil.s.tantilov@...el.com>,
Michal Kubecek <mkubecek@...e.cz>,
Jay Vosburgh <jay.vosburgh@...onical.com>
Cc: "vfalico@...il.com" <vfalico@...il.com>,
"gospo@...ulusnetworks.com" <gospo@...ulusnetworks.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"Shteinbock, Boris (Wind River)" <boris.shteinbock@...driver.com>
Subject: Re: [PATCH 1/1] bonding: restrict up state in 802.3ad mode
On 01/07/2016 10:43 AM, Tantilov, Emil S wrote:
>> -----Original Message-----
>> From: zhuyj [mailto:zyjzyj2000@...il.com]
>> Sent: Tuesday, January 05, 2016 7:05 PM
>> To: Tantilov, Emil S; Michal Kubecek; Jay Vosburgh
>> Cc: vfalico@...il.com; gospo@...ulusnetworks.com; netdev@...r.kernel.org;
>> Shteinbock, Boris (Wind River)
>> Subject: Re: [PATCH 1/1] bonding: restrict up state in 802.3ad mode
>>
>> On 01/06/2016 09:26 AM, Tantilov, Emil S wrote:
>>>> -----Original Message-----
>>>> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
>> On
>>>> Behalf Of zhuyj
>>>> Sent: Monday, December 28, 2015 1:19 AM
>>>> To: Michal Kubecek; Jay Vosburgh
>>>> Cc: vfalico@...il.com; gospo@...ulusnetworks.com;
>> netdev@...r.kernel.org;
>>>> Shteinbock, Boris (Wind River)
>>>> Subject: Re: [PATCH 1/1] bonding: restrict up state in 802.3ad mode
>>>>
>>>> On 12/28/2015 04:43 PM, Michal Kubecek wrote:
>>>>> On Thu, Dec 17, 2015 at 01:57:16PM -0800, Jay Vosburgh wrote:
>>>>>> <zyjzyj2000@...il.com> wrote:
>>>>>>> In 802.3ad mode, the speed and duplex is needed. But in some NIC,
>>>>>>> there is a time span between NIC up state and getting speed and
>> duplex.
>>>>>>> As such, sometimes a slave in 802.3ad mode is in up state without
>>>>>>> speed and duplex. This will make bonding in 802.3ad mode can not
>>>>>>> work well.
>>>>>>> To make bonding driver be compatible with more NICs, it is
>>>>>>> necessary to restrict the up state in 802.3ad mode.
>>>>>> What device is this? It seems a bit odd that an Ethernet device
>>>>>> can be carrier up but not have the duplex and speed available.
>>>>> ...
>>>>>> In general, though, bonding expects a speed or duplex change to
>>>>>> be announced via a NETDEV_UPDATE or NETDEV_UP notifier, which would
>>>>>> propagate to the 802.3ad logic.
>>>>>>
>>>>>> If the device here is going carrier up prior to having speed or
>>>>>> duplex available, then maybe it should call netdev_state_change() when
>>>>>> the duplex and speed are available, or delay calling
>> netif_carrier_on().
>>>>> I have encountered this problem (NIC having carrier on before being
>> able
>>>>> to detect speed/duplex and driver not notifying when speed/duplex
>>>>> becomes available) with netxen cards earlier. But it was eventually
>>>>> fixed in the driver by commit 9d01412ae76f ("netxen: Fix link event
>>>>> handling.") so this example rather supports what you said.
>>>>>
>>>>> Michal
>> Kubecek
>>>> Thanks a lot.
>>>> I checked the commit 9d01412ae76f ("netxen: Fix link event
>>>> handling."). The symptoms are the same with mine.
>>>>
>>>> The root cause is different. In my problem, the root cause is that LINKS
>>>> register[] can not provide link_up and link_speed at the same time.
>>>> There is a time span between link_up and link_speed.
>>> The LINK_UP and LINK_SPEED bits in the LINKS register for ixgbe HW are
>> updated
>>> simultaneously. Do you have any proof to show the delay you are referring
>> to
>>> as I am sure our HW engineers would like to know about it.
>> Sorry. I can not reproduce this problem locally. What I have is the
>> feedback from the customer.
> So you are assuming that there is a delay due to the issue you are seeing?
>
>> Settings for eth0:
>> Supported ports: [ TP ]
>> Supported link modes: 100baseT/Full
>> 1000baseT/Full
>> 10000baseT/Full
>> Supported pause frame use: No
>> Supports auto-negotiation: Yes
>> Advertised link modes: 100baseT/Full
>> 1000baseT/Full
>> 10000baseT/Full
>> Advertised pause frame use: No
>> Advertised auto-negotiation: Yes
>> Speed: Unknown!
>> Duplex: Unknown! (255)
>> Port: Twisted Pair
>> PHYAD: 0
>> Transceiver: external
>> Auto-negotiation: on
>> MDI-X: Unknown
>> Supports Wake-on: d
>> Wake-on: d
>> Current message level: 0x00000007 (7)
>> drv probe link
>> Link detected: yes
> The speed and the link state here are reported from
> different sources:
>
>> Link detected: yes
> Comes from a netif_carrier_ok() check. This is done via ethtool_op_get_link().
>
> Only the speed is reported through the LINKS register - that is why it is reported
> as "Unknown" - in other words link_up is false.
>
> This is a trace from the case where the bonding driver reports 0 Mbps:
>
> kworker/u48:1-27950 [010] .... 6493.084916: ixgbe_service_task: eth1: link_speed = 80, link_up = false
> kworker/u48:1-27950 [011] .... 6493.184894: ixgbe_service_task: eth1: link_speed = 80, link_up = false
> kworker/u48:1-27950 [000] .... 6494.439883: ixgbe_service_task: eth1: link_speed = 80, link_up = true
> kworker/u48:1-27950 [000] .... 6494.464204: ixgbe_service_task: eth1: NIC Link is Up 10 Gbps, Flow Control: RX/TX
> kworker/0:2-1926 [000] .... 6494.464249: ixgbe_get_settings: eth1: link_speed = 80, link_up = false
> NetworkManager-3819 [008] .... 6494.464484: ixgbe_get_settings: eth1: link_speed = 80, link_up = false
> kworker/u48:1-27950 [007] .... 6494.496886: bond_mii_monitor: bond0: link status definitely up for interface eth1, 0 Mbps full duplex
> NetworkManager-3819 [008] .... 6494.496967: ixgbe_get_settings: eth1: link_speed = 80, link_up = false
> kworker/u48:1-27950 [008] .... 6495.288798: ixgbe_service_task: eth1: link_speed = 80, link_up = true
> kworker/u48:1-27950 [008] .... 6495.388806: ixgbe_service_task: eth1: link_speed = 80, link_up = true
Hi, Emil
Thanks for your feedback.
From your log, I think the following can explain why bonding driver can
not get speed.
bonding ixgbe
. .
. <----------------------- NETDEV_UP
. .
bond_slave_netdev_event NETDEV_DOWN
. .
. .
. .
NETDEV_UP .
. ----------------> get_settings
.
speed unknown <--------------- link_up false
.
.
link_up = true
link_speed = unknown
In the above, ixgbe is up and bonding gets this message, then bonding
calls bond_slave_netdev_event while ixgbe is down.
In bond_slave_netdev_event, bonding call get_settings in ixgbe to get
link_speed. Since now ixgbe is down, so link_speed is
unknown. In the end, bonding get the final state of ixgbe as link_up
without link_speed.
If you agree with me, would you like to help me to make tests with the
following patch?
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index d681273..3efc4d8 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -285,27 +285,24 @@ static int ixgbe_get_settings(struct net_device
*netdev,
}
hw->mac.ops.check_link(hw, &link_speed, &link_up, false);
- if (link_up) {
- switch (link_speed) {
- case IXGBE_LINK_SPEED_10GB_FULL:
- ethtool_cmd_speed_set(ecmd, SPEED_10000);
- break;
- case IXGBE_LINK_SPEED_2_5GB_FULL:
- ethtool_cmd_speed_set(ecmd, SPEED_2500);
- break;
- case IXGBE_LINK_SPEED_1GB_FULL:
- ethtool_cmd_speed_set(ecmd, SPEED_1000);
- break;
- case IXGBE_LINK_SPEED_100_FULL:
- ethtool_cmd_speed_set(ecmd, SPEED_100);
- break;
- default:
- break;
- }
- ecmd->duplex = DUPLEX_FULL;
- } else {
- ethtool_cmd_speed_set(ecmd, SPEED_UNKNOWN);
+
+ ecmd->duplex = DUPLEX_FULL;
+ switch (link_speed) {
+ case IXGBE_LINK_SPEED_10GB_FULL:
+ ethtool_cmd_speed_set(ecmd, SPEED_10000);
+ break;
+ case IXGBE_LINK_SPEED_2_5GB_FULL:
+ ethtool_cmd_speed_set(ecmd, SPEED_2500);
+ break;
+ case IXGBE_LINK_SPEED_1GB_FULL:
+ ethtool_cmd_speed_set(ecmd, SPEED_1000);
+ break;
+ case IXGBE_LINK_SPEED_100_FULL:
+ ethtool_cmd_speed_set(ecmd, SPEED_100);
+ break;
+ default:
ecmd->duplex = DUPLEX_UNKNOWN;
+ break;
}
return 0;
Thanks a lot.
Zhu Yanjun
>
> As you can see the link is initially established, but then lost and if just so happens that the
> bonding driver is checking it at that time it will report 0 Mbps.
>
> I will give your patch a try and see if it helps in this situation.
>
> Thanks,
> Emil
>
>
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