Re: [PATCH v2] net/ice: fix link update

[Shuang Han <hanshuang87@gmail.com>]

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ice_atomic_write_link_status in ice_link_update function is not protected
by the spinlock, there maybe a situation：
1.dev_start call ice_link_update with wait_to_complete = 1，and
get link_status = 0
2.LSC interrupt handler call ice_link_update and get link_status = 1
3.LSC interrupt handler call ice_atomic_write_link_status update link
status to 1
4.dev_start call ice_atomic_write_link_status update link status to 0
So I think ice_atomic_write_link_status must be protected by spinlock

Zhang, Qi Z <qi.z.zhang@intel.com> 于2023年12月21日周四 10:44写道：

>
>
> > -----Original Message-----
> > From: Yang, Qiming <qiming.yang@intel.com>
> > Sent: Thursday, December 21, 2023 9:44 AM
> > To: Zhang, Qi Z <qi.z.zhang@intel.com>
> > Cc: dev@dpdk.org; stable@dpdk.org
> > Subject: RE: [PATCH v2] net/ice: fix link update
> >
> > hi
> >
> > > -----Original Message-----
> > > From: Zhang, Qi Z <qi.z.zhang@intel.com>
> > > Sent: Thursday, December 14, 2023 4:41 PM
> > > To: Yang, Qiming <qiming.yang@intel.com>
> > > Cc: dev@dpdk.org; Zhang, Qi Z <qi.z.zhang@intel.com>; stable@dpdk.org
> > > Subject: [PATCH v2] net/ice: fix link update
> > >
> > > The ice_aq_get_link_info function is not thread-safe. However, it is
> > > possible to simultaneous invocations during both the dev_start and the
> > > LSC interrupt handler, potentially leading to unexpected adminq
> > > errors. This patch addresses the issue by introducing a thread-safe
> > > wrapper that utilizes a spinlock.
> > >
> > > Fixes: cf911d90e366 ("net/ice: support link update")
> > > Cc: stable@dpdk.org
> > >
> > > Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
> > > ---
> > > v2:
> > > - fix coding style warning.
> > >
> > >  drivers/net/ice/ice_ethdev.c | 26 ++++++++++++++++++++------
> > > drivers/net/ice/ice_ethdev.h |  4 ++++
> > >  2 files changed, 24 insertions(+), 6 deletions(-)
> > >
> > > diff --git a/drivers/net/ice/ice_ethdev.c
> > > b/drivers/net/ice/ice_ethdev.c index 3ccba4db80..1f8ab5158a 100644
> > > --- a/drivers/net/ice/ice_ethdev.c
> > > +++ b/drivers/net/ice/ice_ethdev.c
> > > @@ -1804,6 +1804,7 @@ ice_pf_setup(struct ice_pf *pf)
> > >     }
> > >
> > >     pf->main_vsi = vsi;
> > > +   rte_spinlock_init(&pf->link_lock);
> > >
> > >     return 0;
> > >  }
> > > @@ -3621,17 +3622,31 @@ ice_rxq_intr_setup(struct rte_eth_dev *dev)
> > >     return 0;
> > >  }
> > >
> > > +static enum ice_status
> > > +ice_get_link_info_safe(struct ice_pf *pf, bool ena_lse,
> > > +                  struct ice_link_status *link) {
> > > +   struct ice_hw *hw = ICE_PF_TO_HW(pf);
> > > +   int ret;
> > > +
> > > +   rte_spinlock_lock(&pf->link_lock);
> > > +
> > > +   ret = ice_aq_get_link_info(hw->port_info, ena_lse, link, NULL);
> > > +
> > > +   rte_spinlock_unlock(&pf->link_lock);
> > > +
> > > +   return ret;
> > > +}
> > > +
> > >  static void
> > >  ice_get_init_link_status(struct rte_eth_dev *dev)  {
> > > -   struct ice_hw *hw = ICE_DEV_PRIVATE_TO_HW(dev->data-
> > > >dev_private);
> > >     struct ice_pf *pf = ICE_DEV_PRIVATE_TO_PF(dev->data-
> > > >dev_private);
> > >     bool enable_lse = dev->data->dev_conf.intr_conf.lsc ? true : false;
> > >     struct ice_link_status link_status;
> > >     int ret;
> > >
> > > -   ret = ice_aq_get_link_info(hw->port_info, enable_lse,
> > > -                              &link_status, NULL);
> > > +   ret = ice_get_link_info_safe(pf, enable_lse, &link_status);
> > >     if (ret != ICE_SUCCESS) {
> > >             PMD_DRV_LOG(ERR, "Failed to get link info");
> > >             pf->init_link_up = false;
> > > @@ -3996,7 +4011,7 @@ ice_link_update(struct rte_eth_dev *dev, int
> > > wait_to_complete)  {  #define CHECK_INTERVAL 50  /* 50ms */  #define
> > > MAX_REPEAT_TIME 40  /* 2s (40 * 50ms) in total */
> > > -   struct ice_hw *hw = ICE_DEV_PRIVATE_TO_HW(dev->data-
> > > >dev_private);
> > > +   struct ice_pf *pf = ICE_DEV_PRIVATE_TO_PF(dev->data-
> > > >dev_private);
> > >     struct ice_link_status link_status;
> > >     struct rte_eth_link link, old;
> > >     int status;
> > > @@ -4010,8 +4025,7 @@ ice_link_update(struct rte_eth_dev *dev, int
> > > wait_to_complete)
> > >
> > >     do {
> > >             /* Get link status information from hardware */
> > > -           status = ice_aq_get_link_info(hw->port_info, enable_lse,
> > > -                                         &link_status, NULL);
> > > +           status = ice_get_link_info_safe(pf, enable_lse,
> &link_status);
> > >             if (status != ICE_SUCCESS) {
> > >                     link.link_speed = RTE_ETH_SPEED_NUM_100M;
> > >                     link.link_duplex = RTE_ETH_LINK_FULL_DUPLEX; diff -
> > -git
> > > a/drivers/net/ice/ice_ethdev.h b/drivers/net/ice/ice_ethdev.h index
> > > abe6dcdc23..d607f028e0 100644
> > > --- a/drivers/net/ice/ice_ethdev.h
> > > +++ b/drivers/net/ice/ice_ethdev.h
> > > @@ -548,6 +548,10 @@ struct ice_pf {
> > >     uint64_t rss_hf;
> > >     struct ice_tm_conf tm_conf;
> > >     uint16_t outer_ethertype;
> > > +   /* lock prevent race condition between lsc interrupt handler
> > > +    * and link status update during dev_start.
> > > +    */
> > > +   rte_spinlock_t link_lock;
> > >  };
> > >
> > >  #define ICE_MAX_QUEUE_NUM  2048
> > > --
> > > 2.31.1
> >
> >
> > Acked-by: Qiming Yang <qiming.yang@intel.com>
>
> Applied to dpdk-next-net-intel.
>
> Thanks
> Qi
>

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