linux-kernel - Re: [PATCH V2] mpt3sas: support target smid for [abort|query] task

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Message-ID: <CAK=zhgoqoTDZb=q9Cq7hC+RDNOC9GTKCnDdHeiPsYcKOaT8N6g@mail.gmail.com>
Date:   Fri, 26 Jul 2019 15:19:50 +0530
From:   Sreekanth Reddy <sreekanth.reddy@...adcom.com>
To:     minwoo.im@...sung.com
Cc:     "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>,
        "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>,
        Sungjun Park <sj1228.park@...sung.com>,
        "minwoo.im.dev@...il.com" <minwoo.im.dev@...il.com>
Subject: Re: [PATCH V2] mpt3sas: support target smid for [abort|query] task

On Sun, Jul 14, 2019 at 9:14 AM Minwoo Im <minwoo.im@...sung.com> wrote:
>
> 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.  Otherwise, user space just can pass 0 TaskMID to
> abort the first outstanding smid which is legacy behaviour.
>
> Cc: Sreekanth Reddy <sreekanth.reddy@...adcom.com>
> Cc: Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>
> Cc: Sathya Prakash <sathya.prakash@...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>

Acked-by:  Sreekanth Reddy <sreekanth.reddy@...adcom.com>

> ---
>  drivers/scsi/mpt3sas/mpt3sas_ctl.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.c b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> index b2bb47c14d35..f6b8fd90610a 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> @@ -596,8 +596,16 @@ _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 the given TaskMID from the user space is zero, then the
> +                * first outstanding smid will be picked up.  Otherwise,
> +                * targeted smid will be the one.
> +                */
> +               if (!tm_request->TaskMID || tm_request->TaskMID == st->smid) {
> +                       tm_request->TaskMID = cpu_to_le16(st->smid);
> +                       found = 1;
> +               }
>         }
>
>         if (!found) {
> --
> 2.16.1
>