Merge branch 'srp' into for-next

Documentation/ABI/stable/sysfs-driver-ib_srp

+What:		/sys/class/infiniband_srp/srp-<hca>-<port_number>/add_target
+Date:		January 2, 2006
+KernelVersion:	2.6.15
+Contact:	linux-rdma@vger.kernel.org
+Description:	Interface for making ib_srp connect to a new target.
+		One can request ib_srp to connect to a new target by writing
+		a comma-separated list of login parameters to this sysfs
+		attribute. The supported parameters are:
+		* id_ext, a 16-digit hexadecimal number specifying the eight
+		  byte identifier extension in the 16-byte SRP target port
+		  identifier. The target port identifier is sent by ib_srp
+		  to the target in the SRP_LOGIN_REQ request.
+		* ioc_guid, a 16-digit hexadecimal number specifying the eight
+		  byte I/O controller GUID portion of the 16-byte target port
+		  identifier.
+		* dgid, a 32-digit hexadecimal number specifying the
+		  destination GID.
+		* pkey, a four-digit hexadecimal number specifying the
+		  InfiniBand partition key.
+		* service_id, a 16-digit hexadecimal number specifying the
+		  InfiniBand service ID used to establish communication with
+		  the SRP target. How to find out the value of the service ID
+		  is specified in the documentation of the SRP target.
+		* max_sect, a decimal number specifying the maximum number of
+		  512-byte sectors to be transferred via a single SCSI command.
+		* max_cmd_per_lun, a decimal number specifying the maximum
+		  number of outstanding commands for a single LUN.
+		* io_class, a hexadecimal number specifying the SRP I/O class.
+		  Must be either 0xff00 (rev 10) or 0x0100 (rev 16a). The I/O
+		  class defines the format of the SRP initiator and target
+		  port identifiers.
+		* initiator_ext, a 16-digit hexadecimal number specifying the
+		  identifier extension portion of the SRP initiator port
+		  identifier. This data is sent by the initiator to the target
+		  in the SRP_LOGIN_REQ request.
+		* cmd_sg_entries, a number in the range 1..255 that specifies
+		  the maximum number of data buffer descriptors stored in the
+		  SRP_CMD information unit itself. With allow_ext_sg=0 the
+		  parameter cmd_sg_entries defines the maximum S/G list length
+		  for a single SRP_CMD, and commands whose S/G list length
+		  exceeds this limit after S/G list collapsing will fail.
+		* allow_ext_sg, whether ib_srp is allowed to include a partial
+		  memory descriptor list in an SRP_CMD instead of the entire
+		  list. If a partial memory descriptor list has been included
+		  in an SRP_CMD the remaining memory descriptors are
+		  communicated from initiator to target via an additional RDMA
+		  transfer. Setting allow_ext_sg to 1 increases the maximum
+		  amount of data that can be transferred between initiator and
+		  target via a single SCSI command. Since not all SRP target
+		  implementations support partial memory descriptor lists the
+		  default value for this option is 0.
+		* sg_tablesize, a number in the range 1..2048 specifying the
+		  maximum S/G list length the SCSI layer is allowed to pass to
+		  ib_srp. Specifying a value that exceeds cmd_sg_entries is
+		  only safe with partial memory descriptor list support enabled
+		  (allow_ext_sg=1).
+
+What:		/sys/class/infiniband_srp/srp-<hca>-<port_number>/ibdev
+Date:		January 2, 2006
+KernelVersion:	2.6.15
+Contact:	linux-rdma@vger.kernel.org
+Description:	HCA name (<hca>).
+
+What:		/sys/class/infiniband_srp/srp-<hca>-<port_number>/port
+Date:		January 2, 2006
+KernelVersion:	2.6.15
+Contact:	linux-rdma@vger.kernel.org
+Description:	HCA port number (<port_number>).
+
+What:		/sys/class/scsi_host/host<n>/allow_ext_sg
+Date:		May 19, 2011
+KernelVersion:	2.6.39
+Contact:	linux-rdma@vger.kernel.org
+Description:	Whether ib_srp is allowed to include a partial memory
+		descriptor list in an SRP_CMD when communicating with an SRP
+		target.
+
+What:		/sys/class/scsi_host/host<n>/cmd_sg_entries
+Date:		May 19, 2011
+KernelVersion:	2.6.39
+Contact:	linux-rdma@vger.kernel.org
+Description:	Maximum number of data buffer descriptors that may be sent to
+		the target in a single SRP_CMD request.
+
+What:		/sys/class/scsi_host/host<n>/dgid
+Date:		June 17, 2006
+KernelVersion:	2.6.17
+Contact:	linux-rdma@vger.kernel.org
+Description:	InfiniBand destination GID used for communication with the SRP
+		target. Differs from orig_dgid if port redirection has happened.
+
+What:		/sys/class/scsi_host/host<n>/id_ext
+Date:		June 17, 2006
+KernelVersion:	2.6.17
+Contact:	linux-rdma@vger.kernel.org
+Description:	Eight-byte identifier extension portion of the 16-byte target
+		port identifier.
+
+What:		/sys/class/scsi_host/host<n>/ioc_guid
+Date:		June 17, 2006
+KernelVersion:	2.6.17
+Contact:	linux-rdma@vger.kernel.org
+Description:	Eight-byte I/O controller GUID portion of the 16-byte target
+		port identifier.
+
+What:		/sys/class/scsi_host/host<n>/local_ib_device
+Date:		November 29, 2006
+KernelVersion:	2.6.19
+Contact:	linux-rdma@vger.kernel.org
+Description:	Name of the InfiniBand HCA used for communicating with the
+		SRP target.
+
+What:		/sys/class/scsi_host/host<n>/local_ib_port
+Date:		November 29, 2006
+KernelVersion:	2.6.19
+Contact:	linux-rdma@vger.kernel.org
+Description:	Number of the HCA port used for communicating with the
+		SRP target.
+
+What:		/sys/class/scsi_host/host<n>/orig_dgid
+Date:		June 17, 2006
+KernelVersion:	2.6.17
+Contact:	linux-rdma@vger.kernel.org
+Description:	InfiniBand destination GID specified in the parameters
+		written to the add_target sysfs attribute.
+
+What:		/sys/class/scsi_host/host<n>/pkey
+Date:		June 17, 2006
+KernelVersion:	2.6.17
+Contact:	linux-rdma@vger.kernel.org
+Description:	A 16-bit number representing the InfiniBand partition key used
+		for communication with the SRP target.
+
+What:		/sys/class/scsi_host/host<n>/req_lim
+Date:		October 20, 2010
+KernelVersion:	2.6.36
+Contact:	linux-rdma@vger.kernel.org
+Description:	Number of requests ib_srp can send to the target before it has
+		to wait for more credits. For more information see also the
+		SRP credit algorithm in the SRP specification.
+
+What:		/sys/class/scsi_host/host<n>/service_id
+Date:		June 17, 2006
+KernelVersion:	2.6.17
+Contact:	linux-rdma@vger.kernel.org
+Description:	InfiniBand service ID used for establishing communication with
+		the SRP	target.
+
+What:		/sys/class/scsi_host/host<n>/zero_req_lim
+Date:		September 20, 2006
+KernelVersion:	2.6.18
+Contact:	linux-rdma@vger.kernel.org
+Description:	Number of times the initiator had to wait before sending a
+		request to the target because it ran out of credits. For more
+		information see also the SRP credit algorithm in the SRP
+		specification.

Documentation/ABI/stable/sysfs-transport-srp

+What:		/sys/class/srp_remote_ports/port-<h>:<n>/delete
+Date:		June 1, 2012
+KernelVersion:	3.7
+Contact:	linux-scsi@vger.kernel.org, linux-rdma@vger.kernel.org
+Description:	Instructs an SRP initiator to disconnect from a target and to
+		remove all LUNs imported from that target.
+
+What:		/sys/class/srp_remote_ports/port-<h>:<n>/port_id
+Date:		June 27, 2007
+KernelVersion:	2.6.24
+Contact:	linux-scsi@vger.kernel.org
+Description:	16-byte local SRP port identifier in hexadecimal format. An
+		example: 4c:49:4e:55:58:20:56:49:4f:00:00:00:00:00:00:00.
+
+What:		/sys/class/srp_remote_ports/port-<h>:<n>/roles
+Date:		June 27, 2007
+KernelVersion:	2.6.24
+Contact:	linux-scsi@vger.kernel.org
+Description:	Role of the remote port. Either "SRP Initiator" or "SRP Target".

drivers/infiniband/ulp/srp/ib_srp.h

@@ -80,9 +80,7 @@ enum {
 
 enum srp_target_state {
 	SRP_TARGET_LIVE,
-	SRP_TARGET_CONNECTING,
-	SRP_TARGET_DEAD,
-	SRP_TARGET_REMOVED
+	SRP_TARGET_REMOVED,
 };
 
 enum srp_iu_type {
@@ -163,6 +161,9 @@ struct srp_target_port {
 	struct ib_sa_query     *path_query;
 	int			path_query_id;
 
+	u32			rq_tmo_jiffies;
+	bool			connected;
+
 	struct ib_cm_id	       *cm_id;
 
 	int			max_ti_iu_len;
@@ -173,12 +174,12 @@ struct srp_target_port {
 	struct srp_iu	       *rx_ring[SRP_RQ_SIZE];
 	struct srp_request	req_ring[SRP_CMD_SQ_SIZE];
 
-	struct work_struct	work;
+	struct work_struct	remove_work;
 
 	struct list_head	list;
 	struct completion	done;
 	int			status;
-	int			qp_in_error;
+	bool			qp_in_error;
 
 	struct completion	tsk_mgmt_done;
 	u8			tsk_mgmt_status;

drivers/scsi/scsi_transport_srp.c

@@ -38,7 +38,7 @@ struct srp_host_attrs {
 #define to_srp_host_attrs(host)	((struct srp_host_attrs *)(host)->shost_data)
 
 #define SRP_HOST_ATTRS 0
-#define SRP_RPORT_ATTRS 2
+#define SRP_RPORT_ATTRS 3
 
 struct srp_internal {
 	struct scsi_transport_template t;
@@ -47,7 +47,6 @@ struct srp_internal {
 	struct device_attribute *host_attrs[SRP_HOST_ATTRS + 1];
 
 	struct device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1];
-	struct device_attribute private_rport_attrs[SRP_RPORT_ATTRS];
 	struct transport_container rport_attr_cont;
 };
 
@@ -72,24 +71,6 @@ static DECLARE_TRANSPORT_CLASS(srp_host_class, "srp_host", srp_host_setup,
 static DECLARE_TRANSPORT_CLASS(srp_rport_class, "srp_remote_ports",
 			       NULL, NULL, NULL);
 
-#define SETUP_TEMPLATE(attrb, field, perm, test, ro_test, ro_perm)	\
-	i->private_##attrb[count] = dev_attr_##field;		\
-	i->private_##attrb[count].attr.mode = perm;			\
-	if (ro_test) {							\
-		i->private_##attrb[count].attr.mode = ro_perm;		\
-		i->private_##attrb[count].store = NULL;			\
-	}								\
-	i->attrb[count] = &i->private_##attrb[count];			\
-	if (test)							\
-		count++
-
-#define SETUP_RPORT_ATTRIBUTE_RD(field)					\
-	SETUP_TEMPLATE(rport_attrs, field, S_IRUGO, 1, 0, 0)
-
-#define SETUP_RPORT_ATTRIBUTE_RW(field)					\
-	SETUP_TEMPLATE(rport_attrs, field, S_IRUGO | S_IWUSR,		\
-		       1, 1, S_IRUGO)
-
 #define SRP_PID(p) \
 	(p)->port_id[0], (p)->port_id[1], (p)->port_id[2], (p)->port_id[3], \
 	(p)->port_id[4], (p)->port_id[5], (p)->port_id[6], (p)->port_id[7], \
@@ -135,6 +116,24 @@ show_srp_rport_roles(struct device *dev, struct device_attribute *attr,
 
 static DEVICE_ATTR(roles, S_IRUGO, show_srp_rport_roles, NULL);
 
+static ssize_t store_srp_rport_delete(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buf, size_t count)
+{
+	struct srp_rport *rport = transport_class_to_srp_rport(dev);
+	struct Scsi_Host *shost = dev_to_shost(dev);
+	struct srp_internal *i = to_srp_internal(shost->transportt);
+
+	if (i->f->rport_delete) {
+		i->f->rport_delete(rport);
+		return count;
+	} else {
+		return -ENOSYS;
+	}
+}
+
+static DEVICE_ATTR(delete, S_IWUSR, NULL, store_srp_rport_delete);
+
 static void srp_rport_release(struct device *dev)
 {
 	struct srp_rport *rport = dev_to_rport(dev);
@@ -324,12 +323,16 @@ srp_attach_transport(struct srp_function_template *ft)
 	i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
 	i->rport_attr_cont.ac.class = &srp_rport_class.class;
 	i->rport_attr_cont.ac.match = srp_rport_match;
-	transport_container_register(&i->rport_attr_cont);
 
 	count = 0;
-	SETUP_RPORT_ATTRIBUTE_RD(port_id);
-	SETUP_RPORT_ATTRIBUTE_RD(roles);
-	i->rport_attrs[count] = NULL;
+	i->rport_attrs[count++] = &dev_attr_port_id;
+	i->rport_attrs[count++] = &dev_attr_roles;
+	if (ft->rport_delete)
+		i->rport_attrs[count++] = &dev_attr_delete;
+	i->rport_attrs[count++] = NULL;
+	BUG_ON(count > ARRAY_SIZE(i->rport_attrs));
+
+	transport_container_register(&i->rport_attr_cont);
 
 	i->f = ft;
 

include/scsi/scsi_transport_srp.h

@@ -14,13 +14,21 @@ struct srp_rport_identifiers {
 };
 
 struct srp_rport {
+	/* for initiator and target drivers */
+
 	struct device dev;
 
 	u8 port_id[16];
 	u8 roles;
+
+	/* for initiator drivers */
+
+	void *lld_data;	/* LLD private data */
 };
 
 struct srp_function_template {
+	/* for initiator drivers */
+	void (*rport_delete)(struct srp_rport *rport);
 	/* for target drivers */
 	int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int);
 	int (* it_nexus_response)(struct Scsi_Host *, u64, int);