[PATCH] net/iavf: fix abnormal disable HW interrupt

[Zhang, Qi Z]

> -----Original Message-----
> From: Mingjin Ye <mingjinx.ye at intel.com>
> Sent: Thursday, June 8, 2023 2:23 PM
> To: dev at dpdk.org
> Cc: Yang, Qiming <qiming.yang at intel.com>; Zhou, YidingX
> <yidingx.zhou at intel.com>; Ye, MingjinX <mingjinx.ye at intel.com>;
> stable at dpdk.org; Wu, Jingjing <jingjing.wu at intel.com>; Xing, Beilei
> <beilei.xing at intel.com>
> Subject: [PATCH] net/iavf: fix abnormal disable HW interrupt
>
> For command VIRTCHNL_OP_REQUEST_QUEUES, polling access to the admin
> queue has the issue of access overruns after disabling interrupt. That results
> in FW disabling HW interrupt for protection purposes.
>
> The updates/changes in this patch:
> 1. Remove the polling admin queue processing and use the generic interrupt
> processing instead.
> 2. Release redundant queue resource before stopping processing interrupt
> events.
>
> Fixes: 22b123a36d07 ("net/avf: initialize PMD")
> Fixes: ef807926e148 ("net/iavf: support requesting additional queues from
> PF")
> Fixes: 84108425054a ("net/iavf: support asynchronous virtual channel
> message")
> Cc: stable at dpdk.org
>
> Signed-off-by: Mingjin Ye <mingjinx.ye at intel.com>
> ---
>  drivers/net/iavf/iavf_ethdev.c | 25 +++++++++---------
> drivers/net/iavf/iavf_vchnl.c  | 48 +++++++---------------------------
>  2 files changed, 23 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
> index e6cf897293..ba5c88a1ec 100644
> --- a/drivers/net/iavf/iavf_ethdev.c
> +++ b/drivers/net/iavf/iavf_ethdev.c
> @@ -2756,6 +2756,19 @@ iavf_dev_close(struct rte_eth_dev *dev)
>       }
>
>       ret = iavf_dev_stop(dev);
> +
> +     /*
> +      * Release redundant queue resource when close the dev
> +      * so that other vfs can re-use the queues.
> +      */
> +     if (vf->lv_enabled) {
> +             ret = iavf_request_queues(dev,
> IAVF_MAX_NUM_QUEUES_DFLT);
> +             if (ret)
> +                     PMD_DRV_LOG(ERR, "Reset the num of queues
> failed");
> +
> +             vf->max_rss_qregion = IAVF_MAX_NUM_QUEUES_DFLT;
> +     }
> +
>       adapter->closed = true;
>
>       /* free iAVF security device context all related resources */ @@ -
> 2772,18 +2785,6 @@ iavf_dev_close(struct rte_eth_dev *dev)
>       if (vf->promisc_unicast_enabled || vf->promisc_multicast_enabled)
>               iavf_config_promisc(adapter, false, false);
>
> -     /*
> -      * Release redundant queue resource when close the dev
> -      * so that other vfs can re-use the queues.
> -      */
> -     if (vf->lv_enabled) {
> -             ret = iavf_request_queues(dev,
> IAVF_MAX_NUM_QUEUES_DFLT);
> -             if (ret)
> -                     PMD_DRV_LOG(ERR, "Reset the num of queues
> failed");
> -
> -             vf->max_rss_qregion = IAVF_MAX_NUM_QUEUES_DFLT;
> -     }
> -
>       iavf_shutdown_adminq(hw);
>       if (vf->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_WB_ON_ITR)
> {
>               /* disable uio intr before callback unregister */ diff --git
> a/drivers/net/iavf/iavf_vchnl.c b/drivers/net/iavf/iavf_vchnl.c index
> 8cc5377bcf..579c0d0d70 100644
> --- a/drivers/net/iavf/iavf_vchnl.c
> +++ b/drivers/net/iavf/iavf_vchnl.c
> @@ -323,6 +323,7 @@ iavf_execute_vf_cmd(struct iavf_adapter *adapter,
> struct iavf_cmd_info *args,
>
>       switch (args->ops) {
>       case VIRTCHNL_OP_RESET_VF:
> +     case VIRTCHNL_OP_REQUEST_QUEUES:
>               /*no need to wait for response */
>               _clear_cmd(vf);
>               break;

Have you tested the "large VF" case ( > 16 queue) with this patch.
I assume event VIRTCHNL_EVENT_RESET_IMPENDING need to be handled here then to trigger a device reset.
But I didn't see related part in your patch.