Re: [PATCH v2 7/7] ibmvfc: handle extended FPIN events

[Tyrel Datwyler <tyreld@linux.ibm.com>]

On 6/8/26 11:30 AM, Dave Marquardt via B4 Relay wrote:
> From: Dave Marquardt <davemarq@linux.ibm.com>
> 
> Add extended FPIN handling to ibmvfc driver. Tell VIOS ibmvfc can
> handle extended FPIN messages, convert any received to struct fc_els
> descriptors, and call fc_host_fpin_rcv to update statistics and send
> netlink multicast messages to listeners such as multipathd.
> ---
>  drivers/scsi/ibmvscsi/ibmvfc.c       |  41 +++++++++++-
>  drivers/scsi/ibmvscsi/ibmvfc.h       |  31 +++++++++
>  drivers/scsi/ibmvscsi/ibmvfc_kunit.c | 122 +++++++++++++++++++++++++++++++++--
>  3 files changed, 186 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
> index a2252cd2f44b..b034a894e3ec 100644
> --- a/drivers/scsi/ibmvscsi/ibmvfc.c
> +++ b/drivers/scsi/ibmvscsi/ibmvfc.c
> @@ -1515,7 +1515,8 @@ static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
>  	login_info->capabilities =
>  		cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN |
>  			    IBMVFC_CAN_USE_NOOP_CMD | IBMVFC_YES_SCSI |
> -			    IBMVFC_USE_ASYNC_SUBQ | IBMVFC_CAN_HANDLE_FPIN);
> +			    IBMVFC_USE_ASYNC_SUBQ | IBMVFC_CAN_HANDLE_FPIN |
> +			    IBMVFC_CAN_HANDLE_FPIN_EXT);
>  
>  	if (vhost->mq_enabled || vhost->using_channels)
>  		login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS);
> @@ -3254,7 +3255,7 @@ ibmvfc_common_fpin_to_desc(u8 fpin_status, __be64 wwpn, __be16 type, __be16 modi
>  	if (size == 0)
>  		return NULL;
>  
> -	fpin = kzalloc(size, GFP_ATOMIC);
> +	fpin = kzalloc(size, GFP_KERNEL);

I commented on why this was changed in the previous patch, but now its been
reverted back here. Looks like a refactoring artifact that needs to be fixed in
patch 6.

>  	if (fpin == NULL)
>  		return NULL;
>  
> @@ -3371,6 +3372,28 @@ ibmvfc_full_fpin_to_desc(struct ibmvfc_async_subq *ibmvfc_fpin)
>  					  cpu_to_be32(1));
>  }
>  
> +/**
> + * ibmvfc_ext_fpin_to_desc(): allocate and populate a struct fc_els_fpin struct
> + * containing a descriptor.
> + * @ibmvfc_fpin: Pointer to async subq FPIN data
> + *
> + * Allocate a struct fc_els_fpin containing a descriptor and populate
> + * based on data from *ibmvfc_fpin.
> + *
> + * Return:
> + * NULL     - unable to allocate structure
> + * non-NULL - pointer to populated struct fc_els_fpin
> + */
> +static struct fc_els_fpin *
> +ibmvfc_ext_fpin_to_desc(struct ibmvfc_async_subq_fpin *ibmvfc_fpin)
> +{
> +	return ibmvfc_common_fpin_to_desc(ibmvfc_fpin->fpin_status, ibmvfc_fpin->wwpn,
> +					  ibmvfc_fpin->fpin_data.event_type,
> +					  ibmvfc_fpin->fpin_data.event_type_modifier,
> +					  ibmvfc_fpin->fpin_data.event_threshold,
> +					  ibmvfc_fpin->fpin_data.event_data.event_count);
> +}
> +
>  /**
>   * ibmvfc_process_async_work - Process IBMVFC_AE_FPIN async CRQ from work queue
>   * @work: pointer to work_struct
> @@ -3425,7 +3448,19 @@ static void ibmvfc_process_async_work(struct work_struct *work)
>  			fpin = ibmvfc_basic_fpin_to_desc(crq, tgt->wwpn);
>  		} else {
>  			sqfpin = (struct ibmvfc_async_subq_fpin *)subq;
> -			fpin = ibmvfc_full_fpin_to_desc(subq);

I think this should be fpin = NULL here.

> +			if ((subq->flags & IBMVFC_ASYNC_IS_FPIN_EXT) == 0) {
> +				fpin = ibmvfc_full_fpin_to_desc(subq);

As you set it here for non-EXT fpins.

> +			} else if (!(sqfpin->fpin_data.flags & IBMVFC_FPIN_EVENT_TYPE_VALID)) {
> +				dev_err_ratelimited(vhost->dev,
> +						    "Invalid extended FPIN event received");
> +				fpin = NULL;

No longer need to set NULL here

> +			} else if (!ibmvfc_check_caps(vhost, IBMVFC_SUPPORT_FPIN_EXT)) {
> +				dev_err_ratelimited(vhost->dev,
> +						    "Unexpected extended FPIN event received");
> +				fpin = NULL;

Or here.

> +			} else {
> +				fpin = ibmvfc_ext_fpin_to_desc(sqfpin);

And here you set the ext-fpin case.

-Tyrel