linux-kernel - Re: [PATCH v4 2/8] scsi: libsas: introduce sas_find_attached

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Message-ID: <19189c2c-91ee-f389-314f-a5133a5d3ef2@huawei.com>
Date:   Tue, 27 Sep 2022 09:46:19 +0100
From:   John Garry <john.garry@...wei.com>
To:     Jason Yan <yanaijie@...wei.com>, <martin.petersen@...cle.com>,
        <jejb@...ux.ibm.com>
CC:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <hare@...e.com>, <hch@....de>, <bvanassche@....org>,
        <jinpu.wang@...ud.ionos.com>, <damien.lemoal@...nsource.wdc.com>,
        Jack Wang <jinpu.wang@...os.com>
Subject: Re: [PATCH v4 2/8] scsi: libsas: introduce sas_find_attached_phy()
 helper

On 27/09/2022 04:25, Jason Yan wrote:
> LLDDs are implementing their own attached phy finding code repeatedly.
> Factor it out to libsas.
> 
> Signed-off-by: Jason Yan <yanaijie@...wei.com>
> Reviewed-by: Jack Wang <jinpu.wang@...os.com>
> Reviewed-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>

Apart from nit, below:
Reviewed-by: John Garry <john.garry@...wei.com>

> ---
>   drivers/scsi/libsas/sas_expander.c | 16 ++++++++++++++++
>   include/scsi/libsas.h              |  2 ++
>   2 files changed, 18 insertions(+)
> 
> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
> index fa2209080cc2..df5a64ad902f 100644
> --- a/drivers/scsi/libsas/sas_expander.c
> +++ b/drivers/scsi/libsas/sas_expander.c
> @@ -2107,6 +2107,22 @@ int sas_ex_revalidate_domain(struct domain_device *port_dev)
>   	return res;
>   }
>   
> +int sas_find_attached_phy(struct expander_device *ex_dev,
> +			  struct domain_device *dev)

Maybe sas_find_attached_phy_id() is a better name

> +{
> +	struct ex_phy *phy;
> +	int phy_id;
> +
> +	for (phy_id = 0; phy_id < ex_dev->num_phys; phy_id++) {
> +		phy = &ex_dev->ex_phy[phy_id];
> +		if (sas_phy_match_dev_addr(dev, phy))
> +			return phy_id;
> +	}
> +
> +	return -ENODEV;
> +}
> +EXPORT_SYMBOL_GPL(sas_find_attached_phy);
> +
>   void sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,
>   		struct sas_rphy *rphy)
>   {
> diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
> index 2dbead74a2af..75faf2308eae 100644
> --- a/include/scsi/libsas.h
> +++ b/include/scsi/libsas.h
> @@ -750,6 +750,8 @@ int sas_clear_task_set(struct domain_device *dev, u8 *lun);
>   int sas_lu_reset(struct domain_device *dev, u8 *lun);
>   int sas_query_task(struct sas_task *task, u16 tag);
>   int sas_abort_task(struct sas_task *task, u16 tag);
> +int sas_find_attached_phy(struct expander_device *ex_dev,
> +			  struct domain_device *dev);
>   
>   void sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event,
>   			   gfp_t gfp_flags);