linux-kernel - Re: [PATCH 2/6] ibmvscsi: Add and use enums for valid CRQ header values

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Date:	Thu, 4 Feb 2016 09:39:17 +0100
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
Cc:	JBottomley@...n.com, martin.petersen@...cle.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, nfont@...ux.vnet.ibm.com,
	brking@...ux.vnet.ibm.com, hare@...e.de
Subject: Re: [PATCH 2/6] ibmvscsi: Add and use enums for valid CRQ header
 values

On Wed, Feb 03, 2016 at 05:28:30PM -0600, Tyrel Datwyler wrote:
> The PAPR defines four valid header values for the first byte of a
> CRQ message. Namely, an unused/empty message (0x00), a valid
> command/response entry (0x80), a valid initialization entry (0xC0),
> and a transport event (0xFF). Define these values as enums and use
> them in the code in place of their magic number equivalents.
> 
> Signed-off-by: Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
> ---
>  drivers/scsi/ibmvscsi/ibmvscsi.c | 14 +++++++-------
>  drivers/scsi/ibmvscsi/viosrp.h   |  7 +++++++
>  2 files changed, 14 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
> index adfef9d..176260d 100644
> --- a/drivers/scsi/ibmvscsi/ibmvscsi.c
> +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
> @@ -182,7 +182,7 @@ static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
>  
>  	spin_lock_irqsave(&queue->lock, flags);
>  	crq = &queue->msgs[queue->cur];
> -	if (crq->valid & 0x80) {
> +	if (crq->valid & VIOSRP_CRQ_VALID) {
>  		if (++queue->cur == queue->size)
>  			queue->cur = 0;
>  
> @@ -231,7 +231,7 @@ static void ibmvscsi_task(void *data)
>  		/* Pull all the valid messages off the CRQ */
>  		while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
>  			ibmvscsi_handle_crq(crq, hostdata);
> -			crq->valid = 0x00;
> +			crq->valid = VIOSRP_CRQ_FREE;
>  		}
>  
>  		vio_enable_interrupts(vdev);
> @@ -239,7 +239,7 @@ static void ibmvscsi_task(void *data)
>  		if (crq != NULL) {
>  			vio_disable_interrupts(vdev);
>  			ibmvscsi_handle_crq(crq, hostdata);
> -			crq->valid = 0x00;
> +			crq->valid = VIOSRP_CRQ_FREE;
>  		} else {
>  			done = 1;
>  		}
> @@ -474,7 +474,7 @@ static int initialize_event_pool(struct event_pool *pool,
>  		struct srp_event_struct *evt = &pool->events[i];
>  		memset(&evt->crq, 0x00, sizeof(evt->crq));
>  		atomic_set(&evt->free, 1);
> -		evt->crq.valid = 0x80;
> +		evt->crq.valid = VIOSRP_CRQ_VALID;
>  		evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu));
>  		evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token +
>  			sizeof(*evt->xfer_iu) * i);
> @@ -1767,7 +1767,7 @@ static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
>  	struct srp_event_struct *evt_struct =
>  			(__force struct srp_event_struct *)crq->IU_data_ptr;
>  	switch (crq->valid) {
> -	case 0xC0:		/* initialization */
> +	case VIOSRP_CRQ_INIT:		/* initialization */
>  		switch (crq->format) {
>  		case 0x01:	/* Initialization message */
>  			dev_info(hostdata->dev, "partner initialized\n");
> @@ -1791,7 +1791,7 @@ static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
>  			dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
>  		}
>  		return;
> -	case 0xFF:	/* Hypervisor telling us the connection is closed */
> +	case VIOSRP_CRQ_TRANSPORT:	/* Hypervisor telling us the connection is closed */
>  		scsi_block_requests(hostdata->host);
>  		atomic_set(&hostdata->request_limit, 0);
>  		if (crq->format == 0x06) {
> @@ -1807,7 +1807,7 @@ static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
>  			ibmvscsi_reset_host(hostdata);
>  		}
>  		return;
> -	case 0x80:		/* real payload */
> +	case VIOSRP_CRQ_VALID:		/* real payload */
>  		break;
>  	default:
>  		dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
> diff --git a/drivers/scsi/ibmvscsi/viosrp.h b/drivers/scsi/ibmvscsi/viosrp.h
> index d1044e9..17f2de0 100644
> --- a/drivers/scsi/ibmvscsi/viosrp.h
> +++ b/drivers/scsi/ibmvscsi/viosrp.h
> @@ -51,6 +51,13 @@ union srp_iu {
>  	u8 reserved[SRP_MAX_IU_LEN];
>  };
>  
> +enum viosrp_crq_headers {
> +	VIOSRP_CRQ_FREE = 0x00,
> +	VIOSRP_CRQ_VALID = 0x80,
> +	VIOSRP_CRQ_INIT = 0xC0,
> +	VIOSRP_CRQ_TRANSPORT = 0xFF
> +};
> +
>  enum viosrp_crq_formats {
>  	VIOSRP_SRP_FORMAT = 0x01,
>  	VIOSRP_MAD_FORMAT = 0x02,
> -- 
> 2.5.0
> 
> --
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Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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