Re: [PATCH 10/36] target: Implement TMR_ABORT_TASK_SET

[Dmitry Bogdanov <d.bogdanov@yadro.com>]

On Thu, Jul 07, 2022 at 10:40:18PM +0300, Dmitry Bogdanov wrote:
> Hi Thinh,
> 
> On Wed, Jul 06, 2022 at 04:35:26PM -0700, Thinh Nguyen wrote:
> > Task ABORT TASK SET function is required by SCSI transport protocol
> > standards (SAM-4 r14 section 7.3). It is similar to ABORT TASK
> > function, but it applies to all commands received on a specified I_T
> > nexus rather than a specific referenced command. Modify
> > core_tmr_abort_task() to support TMR_ABORT_TASK_SET.
> TCM Core does not support Task Sets, there is no list of commands per
> I_T nexus. Your patch aborts all commands in all I_T nexuses for the
> particular backstore device. That is defenitely not according to SAM.
Sorry, there is a check against se_sess, so this patch looks good
actually.
> > 
> > Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
> > ---
> >  drivers/target/target_core_tmr.c       | 16 +++++++++++-----
> >  drivers/target/target_core_transport.c |  2 +-
> >  2 files changed, 12 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c
> > index 3e73f60319d5..e77721db1ea9 100644
> > --- a/drivers/target/target_core_tmr.c
> > +++ b/drivers/target/target_core_tmr.c
> > @@ -132,11 +132,13 @@ void core_tmr_abort_task(
> >  				continue;
> >  
> >  			ref_tag = se_cmd->tag;
> > -			if (tmr->ref_task_tag != ref_tag)
> > -				continue;
> > +			if (tmr->function == TMR_ABORT_TASK) {
> > +				if (tmr->ref_task_tag != ref_tag)
> > +					continue;
> >  
> > -			pr_err("ABORT_TASK: Found referenced %s task_tag: %llu\n",
> > -			       se_cmd->se_tfo->fabric_name, ref_tag);
> > +				pr_err("ABORT_TASK: Found referenced %s task_tag: %llu\n",
> > +				       se_cmd->se_tfo->fabric_name, ref_tag);
> > +			}
> >  
> >  			spin_lock(&se_sess->sess_cmd_lock);
> >  			rc = __target_check_io_state(se_cmd, se_sess, 0);
> > @@ -159,7 +161,11 @@ void core_tmr_abort_task(
> >  			target_put_cmd_and_wait(se_cmd);
> >  
> >  			atomic_long_inc(&dev->aborts_complete);
> > -			goto exit;
> > +
> > +			if (tmr->function == TMR_ABORT_TASK)
> > +				goto exit;
> > +
> > +			spin_lock_irqsave(&dev->queues[i].lock, flags);
> >  		}
> >  		spin_unlock_irqrestore(&dev->queues[i].lock, flags);
> >  	}
> > diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
> > index cbd876e44cf0..bc1e4a7c4538 100644
> > --- a/drivers/target/target_core_transport.c
> > +++ b/drivers/target/target_core_transport.c
> > @@ -3519,9 +3519,9 @@ static void target_tmr_work(struct work_struct *work)
> >  
> >  	switch (tmr->function) {
> >  	case TMR_ABORT_TASK:
> > +	case TMR_ABORT_TASK_SET:
> >  		core_tmr_abort_task(dev, tmr, cmd->se_sess);
> >  		break;
> > -	case TMR_ABORT_TASK_SET:
> >  	case TMR_CLEAR_ACA:
> >  	case TMR_CLEAR_TASK_SET:
> >  		tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;