linux-kernel - Re: [PATCH 12/13] scsi: fnic: Add support for multiqueue (MQ) in fnic driver

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Date:   Wed, 25 Oct 2023 11:19:40 -0700
From:   Bart Van Assche <bvanassche@....org>
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 12/13] scsi: fnic: Add support for multiqueue (MQ) in fnic
 driver

On 10/20/23 12:06, Karan Tilak Kumar wrote:
> @@ -405,22 +388,20 @@ static inline int fnic_queue_wq_copy_desc(struct fnic *fnic,
>    * Routine to send a scsi cdb
>    * Called with host_lock held and interrupts disabled.
>    */

This patch removes the DEF_SCSI_QCMD() invocation so the above comment 
is now wrong. Please fix it.

> -static int fnic_queuecommand_lck(struct scsi_cmnd *sc)
> +static int fnic_queuecommand_lck(struct scsi_cmnd *sc, uint32_t mqtag, uint16_t hwq)

Because this patch removes the DEF_SCSI_QCMD() invocation, the name of 
the fnic_queuecommand_lck() function is now incorrect. Please remove the 
_lck() suffix.

> -DEF_SCSI_QCMD(fnic_queuecommand)
> +int fnic_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc)
> +{
> +	struct request *const rq = scsi_cmd_to_rq(sc);
> +	int rc;
> +	struct fc_lport *lp = shost_priv(sc->device->host);
> +	struct fnic *fnic = lport_priv(lp);
> +	uint32_t mqtag = 0;
> +	int tag = 0;
> +	uint16_t hwq = 0;
> +
> +	mqtag = blk_mq_unique_tag(rq);
> +	hwq = blk_mq_unique_tag_to_hwq(mqtag);
> +	tag = blk_mq_unique_tag_to_tag(mqtag);
> +
> +	if (tag >= fnic->fnic_max_tag_id) {
> +		FNIC_SCSI_DBG(KERN_ERR, fnic->lport->host,
> +				"fnic<%d>: %s: Out of range tag: 0x%x\n",
> +				fnic->fnic_num, __func__, tag);
> +		sc->result = DID_ERROR << 16;
> +		scsi_done(sc);
> +		return 0;
> +	}
> +
> +	rc = fnic_queuecommand_lck(sc, mqtag, hwq);
> +	return rc;
> +}

The code guarded by "if (tag >= fnic->fnic_max_tag_id)" should be 
removed and instead the driver should ensure that tags never exceed the 
fnic->fnic_max_tag_id limit.

Please also remove the local variable 'rc'.

Thanks,

Bart.