linux-kernel - Re: [PATCH-for-4.6 1/6] target: Add target_alloc

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Message-ID: <1452680061.27508.93.camel@haakon3.risingtidesystems.com>
Date:	Wed, 13 Jan 2016 02:14:21 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Christoph Hellwig <hch@....de>
Cc:	"Nicholas A. Bellinger" <nab@...erainc.com>,
	target-devel <target-devel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Sagi Grimberg <sagig@...lanox.com>,
	Hannes Reinecke <hare@...e.de>,
	Andy Grover <agrover@...hat.com>,
	Vasu Dev <vasu.dev@...ux.intel.com>, Vu Pham <vu@...lanox.com>
Subject: Re: [PATCH-for-4.6 1/6] target: Add target_alloc_session() helper
 function

On Wed, 2016-01-13 at 10:33 +0100, Christoph Hellwig wrote:
> On Wed, Jan 13, 2016 at 01:22:49AM -0800, Nicholas A. Bellinger wrote:
> > Huh..?  It's used by iscsi-target, ib_isert, tcm_qla2xxx, vhost-scsi and
> > tcm_fc.
> > 
> > That's the majority of the drivers people care about.
> 
> ib_isert never calls transport_init_session / transport_init_session_tags
> directly.
> 

Yes.

Not to mention, there is a new struct iscsit_transport based driver on
the way that assumes percpu-ida tag preallocation using this same
method.

> We've got 3 callers to transport_init_session_tags vs 6 to
> transport_init_session.
> 

In that case, I'll look into converting sbp-target, usb-gadget and
xen-scsiback to use percpu-ida like the other consumers here for v4.6
code. 

> iSCSI already works roughly the way I suggest everything should
> work in the future - it uses transport_init_session but manually
> allocates the tags.

iscsi-target needs it open-coded for discovery purposes, because
se_node_acl lookup does not occur.

However for the normal session login se_node_acl lookup back, I don't
see a reason why iscsi-target can't use target_alloc_session() here too.