[dpdk-dev] 2nd try: problem with ixgbe_dev_link_update() for multi-speed fiber [was] Re: [PATCH v4] net/ixgbe: ensure link status is updated

Roger B. Melton rmelton at cisco.com
Fri Jun 2 18:15:50 CEST 2017
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Hi Wei,

Have you had a chance to look at the debug output yet?  Is there any 
additional data you need?

Regards,
Roger


On 5/24/17 2:38 PM, Roger B. Melton wrote:
> Hi Wei,
>
> I am using ixgbe:
>
> 00:02.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit 
> SFI/SFP+ Network Connection (rev 01)
>
> The debug output you requested is below showing the results for both 
> far end link up and far end link down.  In the case of far end link 
> up, the elapse time is too small for the granularity of my logging 
> system.  In the case when the far end link is down, the elapsed time 
> for rte_eth_link_get_nowait() is ~1.4 seconds.  You can really see 
> those 40 and 100msec delays add up when the link is down.
>
> Let me know if you require more information.
>
> Regards,
> Roger
>
>
> Far end link up:
>
> 2017/05/24 18:15:14.353 [ulord-dp]: [3706]:  UUID: 0, ra: 0 (debug): 
> rmeltonDBG Start rte_eth_link_get_nowait()
>
> 2017/05/24 18:15:14.353 [ulord-dp]: [3706]:  UUID: 0, ra: 0 (debug): 
> PMD: ixgbe_check_mac_link_generic(): ixgbe_check_mac_link_generic
>
> 2017/05/24 18:15:14.353 [ulord-dp]: [3706]:  UUID: 0, ra: 0 (debug): 
> rmeltonDBG :End rte_eth_link_get_nowait()
>
>
> Far end link down:
>
>
> 2017/05/24 18:15:38.502 (debug): rmeltonDBG: Start 
> rte_eth_link_get_nowait()
>
> 2017/05/24 18:15:38.502 (debug): PMD: ixgbe_get_media_type_82599(): 
> ixgbe_get_media_type_82599
> 2017/05/24 18:15:38.502 (debug): PMD: 
> ixgbe_setup_mac_link_multispeed_fiber(): 
> ixgbe_setup_mac_link_multispeed_fiber
> 2017/05/24 18:15:38.502 (debug): PMD: 
> ixgbe_get_link_capabilities_82599(): ixgbe_get_link_capabilities_82599
> 2017/05/24 18:15:38.542 (debug): PMD: ixgbe_setup_mac_link_82599(): 
> ixgbe_setup_mac_link_82599
> 2017/05/24 18:15:38.542 (debug): PMD: 
> ixgbe_get_link_capabilities_82599(): ixgbe_get_link_capabilities_82599
> 2017/05/24 18:15:38.542 (debug): PMD: 
> ixgbe_flap_tx_laser_multispeed_fiber(): 
> ixgbe_flap_tx_laser_multispeed_fiber
> 2017/05/24 18:15:38.542 (debug): PMD: ixgbe_check_reset_blocked(): 
> ixgbe_check_reset_blocked
> 2017/05/24 18:15:38.643 (debug): PMD: ixgbe_check_mac_link_generic(): 
> ixgbe_check_mac_link_generic
> 2017/05/24 18:15:38.743 (debug): PMD: ixgbe_check_mac_link_generic(): 
> ixgbe_check_mac_link_generic
> 2017/05/24 18:15:38.843 (debug): PMD: ixgbe_check_mac_link_generic(): 
> ixgbe_check_mac_link_generic
> 2017/05/24 18:15:38.943 (debug): PMD: ixgbe_check_mac_link_generic(): 
> ixgbe_check_mac_link_generic
> 2017/05/24 18:15:39.043 (debug): PMD: ixgbe_check_mac_link_generic(): 
> ixgbe_check_mac_link_generic
> 2017/05/24 18:15:39.083 (debug): PMD: ixgbe_setup_mac_link_82599(): 
> ixgbe_setup_mac_link_82599
> 2017/05/24 18:15:39.083 (debug): PMD: 
> ixgbe_get_link_capabilities_82599(): ixgbe_get_link_capabilities_82599
> 2017/05/24 18:15:39.083 (debug): PMD: ixgbe_check_reset_blocked(): 
> ixgbe_check_reset_blocked
> 2017/05/24 18:15:39.083 (debug): PMD: 
> ixgbe_verify_lesm_fw_enabled_82599(): ixgbe_verify_lesm_fw_enabled_82599
> 2017/05/24 18:15:39.083 (debug): PMD: ixgbe_read_eeprom_82599(): 
> ixgbe_read_eeprom_82599
> 2017/05/24 18:15:39.083 (debug): PMD: 
> ixgbe_read_eerd_buffer_generic(): ixgbe_read_eerd_buffer_generic
> 2017/05/24 18:15:39.083 (debug): PMD: 
> ixgbe_init_eeprom_params_generic(): ixgbe_init_eeprom_params_generic
> 2017/05/24 18:15:39.083 (debug): PMD: ixgbe_poll_eerd_eewr_done(): 
> ixgbe_poll_eerd_eewr_done
> 2017/05/24 18:15:39.083 (debug): PMD: ixgbe_read_eeprom_82599(): 
> ixgbe_read_eeprom_82599
> 2017/05/24 18:15:39.083 (debug): PMD: 
> ixgbe_read_eerd_buffer_generic(): ixgbe_read_eerd_buffer_generic
> 2017/05/24 18:15:39.083 (debug): PMD: 
> ixgbe_init_eeprom_params_generic(): ixgbe_init_eeprom_params_generic
> 2017/05/24 18:15:39.083 (debug): PMD: ixgbe_poll_eerd_eewr_done(): 
> ixgbe_poll_eerd_eewr_done
> 2017/05/24 18:15:39.165 (debug): PMD: 
> ixgbe_flap_tx_laser_multispeed_fiber(): 
> ixgbe_flap_tx_laser_multispeed_fiber
> 2017/05/24 18:15:39.165 (debug): PMD: ixgbe_check_reset_blocked(): 
> ixgbe_check_reset_blocked
> 2017/05/24 18:15:39.265 (debug): PMD: ixgbe_check_mac_link_generic(): 
> ixgbe_check_mac_link_generic
> 2017/05/24 18:15:39.265 (debug): PMD: 
> ixgbe_setup_mac_link_multispeed_fiber(): 
> ixgbe_setup_mac_link_multispeed_fiber
> 2017/05/24 18:15:39.265 (debug): PMD: 
> ixgbe_get_link_capabilities_82599(): ixgbe_get_link_capabilities_82599
> 2017/05/24 18:15:39.305 (debug): PMD: ixgbe_setup_mac_link_82599(): 
> ixgbe_setup_mac_link_82599
> 2017/05/24 18:15:39.305 (debug): PMD: 
> ixgbe_get_link_capabilities_82599(): ixgbe_get_link_capabilities_82599
> 2017/05/24 18:15:39.305 (debug): PMD: ixgbe_check_reset_blocked(): 
> ixgbe_check_reset_blocked
> 2017/05/24 18:15:39.305 (debug): PMD: 
> ixgbe_verify_lesm_fw_enabled_82599(): ixgbe_verify_lesm_fw_enabled_82599
> 2017/05/24 18:15:39.305 (debug): PMD: ixgbe_read_eeprom_82599(): 
> ixgbe_read_eeprom_82599
> 2017/05/24 18:15:39.305 (debug): PMD: 
> ixgbe_read_eerd_buffer_generic(): ixgbe_read_eerd_buffer_generic
> 2017/05/24 18:15:39.305 (debug): PMD: 
> ixgbe_init_eeprom_params_generic(): ixgbe_init_eeprom_params_generic
> 2017/05/24 18:15:39.305 (debug): PMD: ixgbe_poll_eerd_eewr_done(): 
> ixgbe_poll_eerd_eewr_done
> 2017/05/24 18:15:39.305 (debug): PMD: ixgbe_read_eeprom_82599(): 
> ixgbe_read_eeprom_82599
> 2017/05/24 18:15:39.305 (debug): PMD: 
> ixgbe_read_eerd_buffer_generic(): ixgbe_read_eerd_buffer_generic
> 2017/05/24 18:15:39.305 (debug): PMD: 
> ixgbe_init_eeprom_params_generic(): ixgbe_init_eeprom_params_generic
> 2017/05/24 18:15:39.305 (debug): PMD: ixgbe_poll_eerd_eewr_done(): 
> ixgbe_poll_eerd_eewr_done
> 2017/05/24 18:15:39.387 (debug): PMD: 
> ixgbe_flap_tx_laser_multispeed_fiber(): 
> ixgbe_flap_tx_laser_multispeed_fiber
> 2017/05/24 18:15:39.387 (debug): PMD: ixgbe_check_reset_blocked(): 
> ixgbe_check_reset_blocked
> 2017/05/24 18:15:39.487 (debug): PMD: ixgbe_check_mac_link_generic(): 
> ixgbe_check_mac_link_generic
> 2017/05/24 18:15:39.587 (debug): PMD: ixgbe_check_mac_link_generic(): 
> ixgbe_check_mac_link_generic
> 2017/05/24 18:15:39.687 (debug): PMD: ixgbe_check_mac_link_generic(): 
> ixgbe_check_mac_link_generic
> 2017/05/24 18:15:39.787 (debug): PMD: ixgbe_check_mac_link_generic(): 
> ixgbe_check_mac_link_generic
> 2017/05/24 18:15:39.887 (debug): PMD: ixgbe_check_mac_link_generic(): 
> ixgbe_check_mac_link_generic
> 2017/05/24 18:15:39.887 (debug): PMD: ixgbe_check_mac_link_generic(): 
> ixgbe_check_mac_link_generic
>
> 2017/05/24 18:15:39.887 (debug): rmeltonDBG 
> posix_pmd_oper_state_get_by_id:End rte_eth_link_get_nowait()
>
>
> On 5/24/17 10:40 AM, Roger B. Melton wrote:
>> Hi Wei,
>>
>> Thanks for getting back to me.  I'm also dealing with various 
>> priorities so it'll take me a bit to get the data, but I'll get back 
>> to you with the details in the next day or so.
>>
>> Regards,
>> Roger
>>
>>
>> On 5/23/17 3:41 AM, Dai, Wei wrote:
>>> Hi, Roger
>>> Sorry for typo error. You should set --log-level=8
>>>
>>> Regards
>>> -Wei
>>>
>>>> -----Original Message-----
>>>> From: Dai, Wei
>>>> Sent: Tuesday, May 23, 2017 3:24 PM
>>>> To: 'Roger B. Melton' <rmelton at cisco.com>; Laurent Hardy
>>>> <laurent.hardy at 6wind.com>; dev at dpdk.org
>>>> Cc: Yigit, Ferruh <ferruh.yigit at intel.com>; Zhang, Helin
>>>> <helin.zhang at intel.com>; Ananyev, Konstantin
>>>> <konstantin.ananyev at intel.com>; olivier.matz at 6wind.com
>>>> Subject: RE: 2nd try: problem with ixgbe_dev_link_update() for 
>>>> multi-speed
>>>> fiber [was] Re: [dpdk-dev] [PATCH v4] net/ixgbe: ensure link status 
>>>> is updated
>>>>
>>>> Hi, Roger
>>>> Sorry for late response as we are busy with other higher priority 
>>>> task.
>>>> ixgbe_setup_mac_link_multispeed_fiber( ) in ixgbe_common.c calls
>>>> ixgbe_setup_mac_link( ) which some functions defined in ixgbe/base .
>>>> Would you please give us more info to narrow down this issue ?
>>>>
>>>> What device id did you use to trigger this issue ?
>>>>
>>>> To get more info, would you please change
>>>> "CONFIG_RTE_LIBRTE_IXGBE_DEBUG_DRIVER=n" to"
>>>> CONFIG_RTE_LIBRTE_IXGBE_DEBUG_DRIVER=y" in config/common_base And
>>>> run your application with EAL parameter --log-level=7  to get trace 
>>>> path of
>>>> ixgbe functions for us.
>>>>
>>>> Thanks & Best Regards
>>>> -Wei
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: Roger B. Melton [mailto:rmelton at cisco.com]
>>>>> Sent: Tuesday, May 23, 2017 2:54 AM
>>>>> To: Laurent Hardy <laurent.hardy at 6wind.com>; dev at dpdk.org; Dai, Wei
>>>>> <wei.dai at intel.com>
>>>>> Cc: Yigit, Ferruh <ferruh.yigit at intel.com>; Zhang, Helin
>>>>> <helin.zhang at intel.com>; Ananyev, Konstantin
>>>>> <konstantin.ananyev at intel.com>; olivier.matz at 6wind.com
>>>>> Subject: 2nd try: problem with ixgbe_dev_link_update() for 
>>>>> multi-speed
>>>>> fiber [was] Re: [dpdk-dev] [PATCH v4] net/ixgbe: ensure link 
>>>>> status is
>>>>> updated
>>>>>
>>>>> Hi Laurent/Wei,
>>>>>
>>>>> Any thoughts?
>>>>>
>>>>> Regards,
>>>>> Roger
>>>>>
>>>>>
>>>>> On 5/17/17 9:31 AM, Roger B Melton wrote:
>>>>>> Hi Laurent/Wei,
>>>>>>
>>>>>> As I continue to integrate DPDK 17.05 into my application, I have
>>>>>> hit another issue with this patch while testing in a VM with
>>>>>> multispeed fiber ixgbe PCI passthrough.  My application periodically
>>>>>> invokes
>>>>>> rte_eth_link_get_nowait() to detect link state changes. If the link
>>>>>> is down (no cable or far end disabled), ixgbe_setup_link() will not
>>>>>> return for ~1.3seconds due to the link setup algorithm in
>>>>>> ixgbe_common.c:ixgbe_multispeed_fiber():
>>>>>>
>>>>>> +    if ((intr->flags & IXGBE_FLAG_NEED_LINK_CONFIG) &&
>>>>>> +        hw->mac.ops.get_media_type(hw) == ixgbe_media_type_fiber) {
>>>>>> +        speed = hw->phy.autoneg_advertised;
>>>>>> +        if (!speed)
>>>>>> +            ixgbe_get_link_capabilities(hw, &speed, &autoneg);
>>>>>> +        ixgbe_setup_link(hw, speed, true); +    }
>>>>>> +
>>>>>>
>>>>>> I have two questions:
>>>>>>
>>>>>>   * Shouldn't we avoid the link setup cost if the caller has 
>>>>>> specified
>>>>>>     not to wait_to_complete?
>>>>>>   * If the concern is speed may not be properly configured, 
>>>>>> shouldn't
>>>>>>     the link setup be deferred until state changes link up thus
>>>>>>     minimizing the delays enforced in ixgbe_multispeed_fiber()?
>>>>>>
>>>>>>
>>>>>> Regards,
>>>>>> -Roger
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On 4/27/17 11:03 AM, Laurent Hardy wrote:
>>>>>>> In case of fiber and link speed set to 1Gb at peer side (with
>>>>>>> autoneg or with defined speed), link status could be not properly
>>>>>>> updated at time cable is plugged-in.
>>>>>>> Indeed if cable was not plugged when device has been configured and
>>>>>>> started then link status will not be updated properly with new
>>>>>>> speed as no link setup will be triggered.
>>>>>>>
>>>>>>> To avoid this issue, IXGBE_FLAG_NEED_LINK_CONFIG is set to try a
>>>>>>> link setup each time link_update() is triggered and current link
>>>>>>> status is down. When cable is plugged-in, link setup will be
>>>>>>> performed via ixgbe_setup_link().
>>>>>>>
>>>>>>> Signed-off-by: Laurent Hardy <laurent.hardy at 6wind.com>
>>>>>>> ---
>>>>>>> Hi Wei, please find enclosed patch v4, tested using testpmd.
>>>>>>>
>>>>>>> v1 -> v2:
>>>>>>> - rebase on top of head (change flag to 1<<4)
>>>>>>> - fix regression with copper links: only update link for fiber
>>>>>>> links
>>>>>>>
>>>>>>> v2 -> v3:
>>>>>>> - remove unnescessary check on speed mask if autoneg is false
>>>>>>>
>>>>>>> v3 -> v4:
>>>>>>> - remove default speed set to 10Gb if autoneg is false, rely on
>>>>>>> ixgbe_get_link_capabilities( ) instead.
>>>>>>> ---
>>>>>>>    drivers/net/ixgbe/ixgbe_ethdev.c | 14 ++++++++++++++
>>>>>>>    drivers/net/ixgbe/ixgbe_ethdev.h |  1 +
>>>>>>>    2 files changed, 15 insertions(+)
>>>>>>>
>>>>>>> diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c
>>>>>>> b/drivers/net/ixgbe/ixgbe_ethdev.c
>>>>>>> index 7b856bb..8a0c0a7 100644
>>>>>>> --- a/drivers/net/ixgbe/ixgbe_ethdev.c
>>>>>>> +++ b/drivers/net/ixgbe/ixgbe_ethdev.c
>>>>>>> @@ -3782,8 +3782,12 @@ ixgbe_dev_link_update(struct rte_eth_dev
>>>>> *dev,
>>>>>>> int wait_to_complete)
>>>>>>>        struct ixgbe_hw *hw =
>>>>>>> IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
>>>>>>>        struct rte_eth_link link, old;
>>>>>>>        ixgbe_link_speed link_speed = IXGBE_LINK_SPEED_UNKNOWN;
>>>>>>> +    struct ixgbe_interrupt *intr =
>>>>>>> + IXGBE_DEV_PRIVATE_TO_INTR(dev->data->dev_private);
>>>>>>>        int link_up;
>>>>>>>        int diag;
>>>>>>> +    u32 speed = 0;
>>>>>>> +    bool autoneg = false;
>>>>>>>          link.link_status = ETH_LINK_DOWN;
>>>>>>>        link.link_speed = 0;
>>>>>>> @@ -3793,6 +3797,14 @@ ixgbe_dev_link_update(struct rte_eth_dev
>>>>> *dev,
>>>>>>> int wait_to_complete)
>>>>>>>          hw->mac.get_link_status = true;
>>>>>>>    +    if ((intr->flags & IXGBE_FLAG_NEED_LINK_CONFIG) &&
>>>>>>> +        hw->mac.ops.get_media_type(hw) == ixgbe_media_type_fiber)
>>>> {
>>>>>>> +        speed = hw->phy.autoneg_advertised;
>>>>>>> +        if (!speed)
>>>>>>> +            ixgbe_get_link_capabilities(hw, &speed, &autoneg);
>>>>>>> +        ixgbe_setup_link(hw, speed, true);
>>>>>>> +    }
>>>>>>> +
>>>>>>>        /* check if it needs to wait to complete, if lsc 
>>>>>>> interrupt is
>>>>>>> enabled */
>>>>>>>        if (wait_to_complete == 0 ||
>>>>>>> dev->data->dev_conf.intr_conf.lsc != 0)
>>>>>>>            diag = ixgbe_check_link(hw, &link_speed, &link_up, 
>>>>>>> 0); @@
>>>>>>> -3810,10 +3822,12 @@ ixgbe_dev_link_update(struct rte_eth_dev *dev,
>>>>>>> int wait_to_complete)
>>>>>>>          if (link_up == 0) {
>>>>>>>            rte_ixgbe_dev_atomic_write_link_status(dev, &link);
>>>>>>> +        intr->flags |= IXGBE_FLAG_NEED_LINK_CONFIG;
>>>>>>>            if (link.link_status == old.link_status)
>>>>>>>                return -1;
>>>>>>>            return 0;
>>>>>>>        }
>>>>>>> +    intr->flags &= ~IXGBE_FLAG_NEED_LINK_CONFIG;
>>>>>>>        link.link_status = ETH_LINK_UP;
>>>>>>>        link.link_duplex = ETH_LINK_FULL_DUPLEX;
>>>>>>>    diff --git a/drivers/net/ixgbe/ixgbe_ethdev.h
>>>>>>> b/drivers/net/ixgbe/ixgbe_ethdev.h
>>>>>>> index 5176b02..b576a6f 100644
>>>>>>> --- a/drivers/net/ixgbe/ixgbe_ethdev.h
>>>>>>> +++ b/drivers/net/ixgbe/ixgbe_ethdev.h
>>>>>>> @@ -45,6 +45,7 @@
>>>>>>>    #define IXGBE_FLAG_MAILBOX          (uint32_t)(1 << 1)
>>>>>>>    #define IXGBE_FLAG_PHY_INTERRUPT    (uint32_t)(1 << 2)
>>>>>>>    #define IXGBE_FLAG_MACSEC           (uint32_t)(1 << 3)
>>>>>>> +#define IXGBE_FLAG_NEED_LINK_CONFIG (uint32_t)(1 << 4)
>>>>>>>      /*
>>>>>>>     * Defines that were not part of ixgbe_type.h as they are not
>>>>>>> used by the
>>>>>> .
>>>>>>
>>
>>
> =
> .
>
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