linux-kernel - Re: [PATCH 4/4] ib_srpt: Convert acl lookup to modern get_initiator_node

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Date:	Fri, 08 Jan 2016 01:17:13 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Bart Van Assche <bart.vanassche@...disk.com>
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>,
	Christoph Hellwig <hch@....de>, 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 4/4] ib_srpt: Convert acl lookup to modern
 get_initiator_node_acl usage

On Fri, 2016-01-08 at 09:52 +0100, Bart Van Assche wrote:
> On 01/08/2016 08:15 AM, Nicholas A. Bellinger wrote:
> > @@ -2574,24 +2558,18 @@ static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
> >
> >   	pr_debug("registering session %s\n", ch->sess_name);
> >
> > -	nacl = srpt_lookup_acl(sport, ch->i_port_id);
> > -	if (!nacl) {
> > +	se_acl = core_tpg_get_initiator_node_acl(&sport->port_tpg_1, ch->sess_name);
> > +	if (!se_acl) {
> >   		pr_info("Rejected login because no ACL has been"
> >   			" configured yet for initiator %s.\n", ch->sess_name);
> >   		rej->reason = cpu_to_be32(
> > -			      SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
> > +				SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
> > +		transport_free_session(ch->sess);
> >   		goto destroy_ib;
> >   	}
> > +	ch->sess->se_node_acl = se_acl;
> 
> This is a backwards-incompatible change. Today the ib_srpt target driver 
> accepts initiator port names with and without leading "0x". With this 
> change the "0x" prefix becomes mandatory.

The internally ib_srpt formatted ch->sess_name already needs to match
se_node_acl->initiatorname for se_node_acl->acl_group configfs group
shutdown reference..

How does this patch become a backworks-incompatible change for that..?

> 
> > diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.h b/drivers/infiniband/ulp/srpt/ib_srpt.h
> > index 5faad8ac..bb4fbe2 100644
> > --- a/drivers/infiniband/ulp/srpt/ib_srpt.h
> > +++ b/drivers/infiniband/ulp/srpt/ib_srpt.h
> > @@ -364,11 +364,9 @@ struct srpt_port {
> >   	u16			sm_lid;
> >   	u16			lid;
> >   	union ib_gid		gid;
> > -	spinlock_t		port_acl_lock;
> >   	struct work_struct	work;
> >   	struct se_portal_group	port_tpg_1;
> >   	struct se_wwn		port_wwn;
> > -	struct list_head	port_acl_list;
> >   	struct srpt_port_attrib port_attrib;
> >   };
> 
> With this patch applied the following srpt_node_acl members are no 
> longer read: i_port_id, sport and list. Hence please remove the 
> srpt_node_acl structure definition and use struct se_node_acl instead.
> 

Dropping these now.