From: zhuyj <zyjzyj2000@gmail.com>
To: "Tantilov, Emil S" <emil.s.tantilov@intel.com>,
"Kirsher, Jeffrey T" <jeffrey.t.kirsher@intel.com>,
"Brandeburg, Jesse" <jesse.brandeburg@intel.com>,
"Nelson, Shannon" <shannon.nelson@intel.com>,
"Wyborny, Carolyn" <carolyn.wyborny@intel.com>,
"Skidmore, Donald C" <donald.c.skidmore@intel.com>,
"Allan, Bruce W" <bruce.w.allan@intel.com>,
"Ronciak, John" <john.ronciak@intel.com>,
"Williams, Mitch A" <mitch.a.williams@intel.com>,
"intel-wired-lan@lists.osuosl.org"
<intel-wired-lan@lists.osuosl.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"e1000-devel@lists.sourceforge.net"
<e1000-devel@lists.sourceforge.net>
Cc: "Viswanathan,
Ven \(Wind River\)" <venkat.viswanathan@windriver.com>,
"Shteinbock,
Boris \(Wind River\)" <boris.shteinbock@windriver.com>,
"Bourg, Vincent \(Wind River\)" <vincent.bourg@windriver.com>
Subject: Re: [Intel-wired-lan] [PATCH 1/1] ixgbe: force to synchronize reporting "link on" and getting speed and duplex
Date: Thu, 24 Dec 2015 14:24:29 +0800 [thread overview]
Message-ID: <567B8F9D.1090709@gmail.com> (raw)
In-Reply-To: <87618083B2453E4A8714035B62D67992504EC970@FMSMSX105.amr.corp.intel.com>
On 12/24/2015 01:58 PM, Tantilov, Emil S wrote:
>> -----Original Message-----
>> From: zhuyj [mailto:zyjzyj2000@gmail.com]
>> Sent: Wednesday, December 23, 2015 6:28 PM
>> To: Tantilov, Emil S; Kirsher, Jeffrey T; Brandeburg, Jesse; Nelson,
>> Shannon; Wyborny, Carolyn; Skidmore, Donald C; Allan, Bruce W; Ronciak,
>> John; Williams, Mitch A; intel-wired-lan@lists.osuosl.org;
>> netdev@vger.kernel.org; e1000-devel@lists.sourceforge.net
>> Cc: Viswanathan, Ven (Wind River); Shteinbock, Boris (Wind River); Bourg,
>> Vincent (Wind River)
>> Subject: Re: [Intel-wired-lan] [PATCH 1/1] ixgbe: force to synchronize
>> reporting "link on" and getting speed and duplex
>>
>> On 12/23/2015 11:59 PM, Tantilov, Emil S wrote:
>>>> -----Original Message-----
>>>> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@lists.osuosl.org]
>> On
>>>> Behalf Of zyjzyj2000@gmail.com
>>>> Sent: Tuesday, December 22, 2015 10:47 PM
>>>> To: Kirsher, Jeffrey T; Brandeburg, Jesse; Nelson, Shannon; Wyborny,
>>>> Carolyn; Skidmore, Donald C; Allan, Bruce W; Ronciak, John; Williams,
>> Mitch
>>>> A; intel-wired-lan@lists.osuosl.org; netdev@vger.kernel.org; e1000-
>>>> devel@lists.sourceforge.net
>>>> Cc: Viswanathan, Ven (Wind River); Shteinbock, Boris (Wind River);
>> Bourg,
>>>> Vincent (Wind River)
>>>> Subject: [Intel-wired-lan] [PATCH 1/1] ixgbe: force to synchronize
>>>> reporting "link on" and getting speed and duplex
>>>>
>>>> From: Zhu Yanjun <zyjzyj2000@gmail.com>
>>>>
>>>> In X540 NIC, there is a time span between reporting "link on" and
>>>> getting the speed and duplex. To a bonding driver in 802.3ad mode,
>>>> this time span will make it not work well if the time span is big
>>>> enough. The big time span will make bonding driver change the state of
>>>> the slave device to up while the speed and duplex of the slave device
>>>> can not be gotten. Later the bonding driver will not have change to
>>>> get the speed and duplex of the slave device. The speed and duplex of
>>>> the slave device are important to a bonding driver in 802.3ad mode.
>>>>
>>>> To 82599_SFP NIC and other kinds of NICs, this problem does
>>>> not exist. As such, it is necessary for X540 to report"link on" when
>>>> the link speed is not IXGBE_LINK_SPEED_UNKNOWN.
>>>>
>>>> Signed-off-by: Zhu Yanjun <zyjzyj2000@gmail.com>
>>>> ---
>>>> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 16 +++++++++++++++-
>>>> 1 file changed, 15 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>>>> b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>>>> index aed8d02..cb9d310 100644
>>>> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>>>> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>>>> @@ -6479,7 +6479,21 @@ static void ixgbe_watchdog_link_is_up(struct
>>>> ixgbe_adapter *adapter)
>>>> (flow_rx ? "RX" :
>>>> (flow_tx ? "TX" : "None"))));
>>>>
>>>> - netif_carrier_on(netdev);
>>>> + /*
>>>> + * In X540 NIC, there is a time span between reporting "link on"
>>>> + * and getting the speed and duplex. To a bonding driver in 802.3ad
>>>> + * mode, this time span will make it not work well if the time span
>>>> + * is big enough. To 82599_SFP NIC and other kinds of NICs, this
>>>> + * problem does not exist. As such, it is better for X540 to report
>>>> + * "link on" when the link speed is not IXGBE_LINK_SPEED_UNKNOWN.
>>>> + */
>>>> + if ((hw->mac.type == ixgbe_mac_X540) &&
>>>> + (link_speed != IXGBE_LINK_SPEED_UNKNOWN)) {
>>>> + netif_carrier_on(netdev);
>>>> + } else {
>>>> + netif_carrier_on(netdev);
>>>> + }
>>>> +
>>>> ixgbe_check_vf_rate_limit(adapter);
>>>>
>>>> /* enable transmits */
>>>> --
>>>> 1.7.9.5
>>> NAK
>>>
>>> I have already submitted a patch that will address the issue with bonding
>> reporting
>>> unknown speed (in /proc/bonding/bondX) after the link is established due
>> to link flaps:
>>> http://patchwork.ozlabs.org/patch/552485/
>>>
>>> The bonding driver gets the speed from ethtool and this is where the
>> reporting needs
>>> to be fixed. The issue is that the bonding driver polls for
>> netif_carrier_ok() at a
>>> certain rate and as such will not be able to detect rapid link changes.
>> Thanks for your reply. The root cause is different from my problem. My
>> problem is that
>> "link up" is prior to "speed and duplex". That is, the physical NIC
>> reports "link up" while
> The "link up" event is a result of an LSC interrupt, the speed is
> determined as result of that interrupt by checking the LINKS register.
Hi,
Sorry. I do not agree with you. Please see the followings for details.
/**
* ixgbe_watchdog_update_link - update the link status
* @adapter: pointer to the device adapter structure
* @link_speed: pointer to a u32 to store the link_speed
**/
static void ixgbe_watchdog_update_link(struct ixgbe_adapter *adapter)
From this function, link_up and link_speed is from watchdo poll.
Thanks for your reply.
Zhu Yanjun
> If the LINKS register reports link as unknown then that is the actual state
> of the PHY - meaning the device is re-negotiating the speed for some reason.
>
>> the speed is unknown at the same time. We can run "ethtool ethx" to
>> confirm it.
> Prior to my patch the ethtool call will read the LINKS register which can show
> speed as unknown due to a link flap (for example). You are seeing the momentary
> state of the device.
>
> If you are still seeing the bond reporting "unknown" speed after the patch I pointed
> out please file a bug either through e1000.sf.net or via Intel support and provide
> detailed information about the bonding setup, the type of the link partner (switch
> model etc) and full dmesg from the failed scenario along with the output from
> /proc/bonding/bond0
>
> Thanks,
> Emil
>
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next prev parent reply other threads:[~2015-12-24 6:24 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-23 6:46 [PATCH 1/1] ixgbe: force to synchronize reporting "link on" and getting speed and duplex zyjzyj2000
2015-12-23 10:54 ` Jeff Kirsher
2015-12-24 3:12 ` [V2 PATCH 1/1] ixgbe: force to synchronize reporting "link on" and zyjzyj2000
2015-12-24 3:12 ` [PATCH 1/1] ixgbe: force to synchronize reporting "link on" and getting speed zyjzyj2000
2015-12-24 5:10 ` [V2 PATCH 1/1] ixgbe: force to synchronize reporting "link on" and zhuyj
2015-12-24 6:17 ` [Intel-wired-lan] " Tantilov, Emil S
2015-12-29 2:32 ` [PATCH V3] ixgbe: force to synchronize link_up and speed as a slave zyjzyj2000
2015-12-29 2:32 ` [PATCH 1/2] ixgbe: force to synchronize reporting "link on" and getting speed zyjzyj2000
2015-12-29 2:32 ` [PATCH 2/2] ixgbe: restrict synchronization of link_up and speed zyjzyj2000
2015-12-29 16:18 ` [Intel-wired-lan] " Tantilov, Emil S
2015-12-29 19:17 ` Rustad, Mark D
2015-12-30 3:06 ` zhuyj
2015-12-30 9:16 ` [PATCH V4] ixgbe: synchronize the link_speed and link_up of a slave interface zyjzyj2000
2015-12-30 9:16 ` [PATCH 1/3] ixgbe: force to synchronize reporting "link on" and getting speed zyjzyj2000
2015-12-30 9:16 ` [PATCH 2/3] ixgbe: restrict synchronization of link_up and speed zyjzyj2000
2015-12-30 9:16 ` [PATCH 3/3] ixgbe: synchronize the link_speed and link_up of a slave interface zyjzyj2000
2015-12-30 19:02 ` Rustad, Mark D
2015-12-31 5:04 ` [PATCH V5] ixgbe: synchronize link_up and link_speed of a slave zyjzyj2000
2015-12-31 5:04 ` [PATCH 1/1] ixgbe: synchronize link_up and link_speed of a slave interface zyjzyj2000
2015-12-31 5:37 ` Jeff Kirsher
2015-12-31 7:11 ` [PATCH V6] ixgbe: synchronize link_up and link_speed of a slave zyjzyj2000
2015-12-31 7:11 ` [PATCH V6 1/1] ixgbe: synchronize link_up and link_speed of a slave interface zyjzyj2000
2015-12-31 5:17 ` [PATCH V5] ixgbe: synchronize link_up and link_speed of a slave Jeff Kirsher
2015-12-31 5:24 ` zhuyj
2015-12-30 2:49 ` [Intel-wired-lan] [PATCH 2/2] ixgbe: restrict synchronization of link_up and speed zhuyj
2015-12-30 6:55 ` Tantilov, Emil S
2015-12-30 8:20 ` zhuyj
2015-12-30 16:37 ` Tantilov, Emil S
2016-01-06 5:41 ` zhuyj
2016-01-06 15:30 ` Tantilov, Emil S
2016-01-07 2:08 ` zhuyj
2016-01-07 2:38 ` zhuyj
2015-12-23 12:17 ` [PATCH 1/1] ixgbe: force to synchronize reporting "link on" and getting speed and duplex Sergei Shtylyov
2015-12-23 15:59 ` [Intel-wired-lan] " Tantilov, Emil S
2015-12-23 18:09 ` [E1000-devel] " Stephen Hemminger
2015-12-24 2:27 ` zhuyj
2015-12-24 5:58 ` Tantilov, Emil S
2015-12-24 6:24 ` zhuyj [this message]
2015-12-24 14:52 ` Tantilov, Emil S
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