Thanks for raising this. Agree with your finding, the current implementation ensures data integrity but not guarantee 100% correctness, as updates to link status by interrupts could be missed in certain cases though less happen. Please raise a Bugzilla if you think its urgent for your usage and welcome to submit a patch directly. Regards Qi From: Shuang Han Sent: Thursday, January 4, 2024 9:17 AM To: Zhang, Qi Z Cc: Yang, Qiming ; dev@dpdk.org; stable@dpdk.org Subject: Re: [PATCH v2] net/ice: fix link update 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 > 于2023年12月21日周四 10:44写道： > -----Original Message----- > From: Yang, Qiming > > Sent: Thursday, December 21, 2023 9:44 AM > To: Zhang, Qi Z > > Cc: dev@dpdk.org; stable@dpdk.org > Subject: RE: [PATCH v2] net/ice: fix link update > > hi > > > -----Original Message----- > > From: Zhang, Qi Z > > > Sent: Thursday, December 14, 2023 4:41 PM > > To: Yang, Qiming > > > Cc: dev@dpdk.org; Zhang, Qi Z >; 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 > > > --- > > 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 > Applied to dpdk-next-net-intel. Thanks Qi