Re: [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

["Dai, Wei" <wei.dai@intel.com>]

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@cisco.com>; Laurent Hardy
> <laurent.hardy@6wind.com>; dev@dpdk.org
> Cc: Yigit, Ferruh <ferruh.yigit@intel.com>; Zhang, Helin
> <helin.zhang@intel.com>; Ananyev, Konstantin
> <konstantin.ananyev@intel.com>; olivier.matz@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@cisco.com]
> > Sent: Tuesday, May 23, 2017 2:54 AM
> > To: Laurent Hardy <laurent.hardy@6wind.com>; dev@dpdk.org; Dai, Wei
> > <wei.dai@intel.com>
> > Cc: Yigit, Ferruh <ferruh.yigit@intel.com>; Zhang, Helin
> > <helin.zhang@intel.com>; Ananyev, Konstantin
> > <konstantin.ananyev@intel.com>; olivier.matz@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@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
> > >
> > > .
> > >