linux-kernel - Re: [RESEND RFC PATCH] mpt3sas: support target smid for [abort|query] task

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Date:   Thu, 27 Jun 2019 16:39:03 +0900
From:   Minwoo Im <minwoo.im@...sung.com>
To:     "sathya.prakash@...adcom.com" <sathya.prakash@...adcom.com>,
        "suganath-prabu.subramani@...adcom.com" 
        <suganath-prabu.subramani@...adcom.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "minwoo.im.dev@...il.com" <minwoo.im.dev@...il.com>
CC:     Minwoo Im <minwoo.im@...sung.com>,
        "MPT-FusionLinux.pdl@...adcom.com" <MPT-FusionLinux.pdl@...adcom.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        Euihyeok Kwon <eh81.kwon@...sung.com>,
        Sarah Cho <sohyeon.jo@...sung.com>,
        Sanggwan Lee <sanggwan.lee@...sung.com>,
        Gyeongmin Nam <gm.nam@...sung.com>
Subject: Re: [RESEND RFC PATCH] mpt3sas: support target smid for
 [abort|query] task

Gentle ping. :)

> -----Original Message-----
> From: Minwoo Im <minwoo.im@...sung.com>
> Sent: Friday, June 21, 2019 3:37 PM
> To: sathya.prakash@...adcom.com; suganath-prabu.subramani@...adcom.com;
> jejb@...ux.ibm.com; martin.petersen@...cle.com
> Cc: Minwoo Im <minwoo.im@...sung.com>; MPT-FusionLinux.pdl@...adcom.com;
> linux-kernel@...r.kernel.org; linux-scsi@...r.kernel.org; linux-
> block@...r.kernel.org; Euihyeok Kwon <eh81.kwon@...sung.com>; Sarah Cho
> <sohyeon.jo@...sung.com>; Sanggwan Lee <sanggwan.lee@...sung.com>;
> Gyeongmin Nam <gm.nam@...sung.com>
> Subject: [RESEND RFC PATCH] mpt3sas: support target smid for [abort|query]
> task
> 
> We can request task management IOCTL command(MPI2_FUNCTION_SCSI_TASK_MGMT)
> to /dev/mpt3ctl.  If the given task_type is either abort task or query
> task, it may need a field named "Initiator Port Transfer Tag to Manage"
> in the IU.
> 
> Current code does not support to check target IPTT tag from the
> tm_request.  This patch introduces to check TaskMID given from the
> userspace as a target tag.  We have a rule of relationship between
> (struct request *req->tag) and smid in mpt3sas_base.c:
> 
> 3318 u16
> 3319 mpt3sas_base_get_smid_scsiio(struct MPT3SAS_ADAPTER *ioc, u8 cb_idx,
> 3320         struct scsi_cmnd *scmd)
> 3321 {
> 3322         struct scsiio_tracker *request = scsi_cmd_priv(scmd);
> 3323         unsigned int tag = scmd->request->tag;
> 3324         u16 smid;
> 3325
> 3326         smid = tag + 1;
> 
> So if we want to abort a request tagged #X, then we can pass (X + 1) to
> this IOCTL handler.
> 
> Cc: Sathya Prakash <sathya.prakash@...adcom.com>
> Cc: Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>
> Cc: James E.J. Bottomley <jejb@...ux.ibm.com>
> Cc: Martin K. Petersen <martin.petersen@...cle.com>
> Cc: MPT-FusionLinux.pdl@...adcom.com
> Signed-off-by: Minwoo Im <minwoo.im@...sung.com>
> ---
>  drivers/scsi/mpt3sas/mpt3sas_ctl.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> index b2bb47c14d35..5c7539dae713 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> @@ -596,15 +596,17 @@ _ctl_set_task_mid(struct MPT3SAS_ADAPTER *ioc,
> struct mpt3_ioctl_command *karg,
>  		if (priv_data->sas_target->handle != handle)
>  			continue;
>  		st = scsi_cmd_priv(scmd);
> -		tm_request->TaskMID = cpu_to_le16(st->smid);
> -		found = 1;
> +		if (tm_request->TaskMID == st->smid) {
> +			tm_request->TaskMID = cpu_to_le16(st->smid);
> +			found = 1;
> +		}
>  	}
> 
>  	if (!found) {
>  		dctlprintk(ioc,
> -			   ioc_info(ioc, "%s: handle(0x%04x), lun(%d), no
> active mid!!\n",
> +			   ioc_info(ioc, "%s: handle(0x%04x), lun(%d), no
> matched mid(%d)!!\n",
>  				    desc, le16_to_cpu(tm_request->DevHandle),
> -				    lun));
> +				    lun, tm_request->TaskMID));
>  		tm_reply = ioc->ctl_cmds.reply;
>  		tm_reply->DevHandle = tm_request->DevHandle;
>  		tm_reply->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
> --
> 2.16.1