linux-kernel - Re: [PATCH v2 06/13] scsi: fnic: Refactor and redefine fnic.h for multiqueue

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Message-ID: <f0e1431c-cfb3-4245-be79-a9f98d4b57fe@suse.de>
Date:   Thu, 2 Nov 2023 08:36:54 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Karan Tilak Kumar <kartilak@...co.com>, sebaddel@...co.com
Cc:     arulponn@...co.com, djhawar@...co.com, gcboffa@...co.com,
        mkai2@...co.com, satishkh@...co.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/13] scsi: fnic: Refactor and redefine fnic.h for
 multiqueue

On 10/27/23 20:02, Karan Tilak Kumar wrote:
> Refactor and re-define values in fnic.h to implement
> multiqueue(MQ) functionality.
> 
> VIC firmware allows fnic to create up to 64 copy
> workqueues. Update the copy workqueue max to 64.
> Modify the interrupt index to be in sync with the firmware
> to support MQ.
> Add irq number to the MSIX entry.
> Define a software workqueue table to track the status of
> io_reqs. Define a base for the copy workqueue.
> 
> Reviewed-by: Sesidhar Baddela <sebaddel@...co.com>
> Reviewed-by: Arulprabhu Ponnusamy <arulponn@...co.com>
> Signed-off-by: Karan Tilak Kumar <kartilak@...co.com>
> ---
>   drivers/scsi/fnic/fnic.h | 30 ++++++++++++++++++++++--------
>   1 file changed, 22 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/scsi/fnic/fnic.h b/drivers/scsi/fnic/fnic.h
> index 9fd01a867788..f4390fc96323 100644
> --- a/drivers/scsi/fnic/fnic.h
> +++ b/drivers/scsi/fnic/fnic.h
> @@ -163,12 +163,21 @@ do {								\
>   #define FNIC_MAIN_NOTE(kern_level, host, fmt, args...)          \
>   	shost_printk(kern_level, host, fmt, ##args)
>   
> +#define FNIC_WQ_COPY_MAX 64
> +#define FNIC_WQ_MAX 1
> +#define FNIC_RQ_MAX 1
> +#define FNIC_CQ_MAX (FNIC_WQ_COPY_MAX + FNIC_WQ_MAX + FNIC_RQ_MAX)
> +#define FNIC_DFLT_IO_COMPLETIONS 256
> +
> +#define FNIC_MQ_CQ_INDEX        2
> +
>   extern const char *fnic_state_str[];
>   
>   enum fnic_intx_intr_index {
>   	FNIC_INTX_WQ_RQ_COPYWQ,
> -	FNIC_INTX_ERR,
> +	FNIC_INTX_DUMMY,
>   	FNIC_INTX_NOTIFY,
> +	FNIC_INTX_ERR,
>   	FNIC_INTX_INTR_MAX,
>   };
>   
> @@ -176,7 +185,7 @@ enum fnic_msix_intr_index {
>   	FNIC_MSIX_RQ,
>   	FNIC_MSIX_WQ,
>   	FNIC_MSIX_WQ_COPY,
> -	FNIC_MSIX_ERR_NOTIFY,
> +	FNIC_MSIX_ERR_NOTIFY = FNIC_MSIX_WQ_COPY + FNIC_WQ_COPY_MAX,
>   	FNIC_MSIX_INTR_MAX,
>   };
>   
> @@ -185,6 +194,7 @@ struct fnic_msix_entry {
>   	char devname[IFNAMSIZ + 11];
>   	irqreturn_t (*isr)(int, void *);
>   	void *devid;
> +	int irq_num;
>   };
>   
>   enum fnic_state {
> @@ -194,12 +204,6 @@ enum fnic_state {
>   	FNIC_IN_ETH_TRANS_FC_MODE,
>   };
>   
> -#define FNIC_WQ_COPY_MAX 1
> -#define FNIC_WQ_MAX 1
> -#define FNIC_RQ_MAX 1
> -#define FNIC_CQ_MAX (FNIC_WQ_COPY_MAX + FNIC_WQ_MAX + FNIC_RQ_MAX)
> -#define FNIC_DFLT_IO_COMPLETIONS 256
> -
>   struct mempool;
>   
>   enum fnic_evt {
> @@ -214,6 +218,13 @@ struct fnic_event {
>   	enum fnic_evt event;
>   };
>   
> +struct fnic_cpy_wq {
> +	unsigned long hw_lock_flags;
> +	u16 active_ioreq_count;
> +	u16 ioreq_table_size;
> +	____cacheline_aligned struct fnic_io_req **io_req_table;
> +};
> +
>   /* Per-instance private data structure */
>   struct fnic {
>   	int fnic_num;
> @@ -283,6 +294,7 @@ struct fnic {
>   	mempool_t *io_sgl_pool[FNIC_SGL_NUM_CACHES];
>   	spinlock_t io_req_lock[FNIC_IO_LOCKS];	/* locks for scsi cmnds */
>   
> +	unsigned int cpy_wq_base;

Please name it 'copy_wq_base'; all other instances in the driver
always names the structures 'copy', not 'cpy' too.
You are not really saving anything by omitting a single character.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@...e.de                              +49 911 74053 688
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