Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending

Pull SCSI target updates from Nicholas Bellinger:
 "Here are the target pending updates for v3.15-rc1.  Apologies in
  advance for waiting until the second to last day of the merge window
  to send these out.

  The highlights this round include:

   - iser-target support for T10 PI (DIF) offloads (Sagi + Or)
   - Fix Task Aborted Status (TAS) handling in target-core (Alex Leung)
   - Pass in transport supported PI at session initialization (Sagi + MKP + nab)
   - Add WRITE_INSERT + READ_STRIP T10 PI support in target-core (nab + Sagi)
   - Fix iscsi-target ERL=2 ASYNC_EVENT connection pointer bug (nab)
   - Fix tcm_fc use-after-free of ft_tpg (Andy Grover)
   - Use correct ib_sg_dma primitives in ib_isert (Mike Marciniszyn)

  Also, note the virtio-scsi + vhost-scsi changes to expose T10 PI
  metadata into KVM guest have been left-out for now, as there where a
  few comments from MST + Paolo that where not able to be addressed in
  time for v3.15.  Please expect this feature for v3.16-rc1"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (43 commits)
  ib_srpt: Use correct ib_sg_dma primitives
  target/tcm_fc: Rename ft_tport_create to ft_tport_get
  target/tcm_fc: Rename ft_{add,del}_lport to {add,del}_wwn
  target/tcm_fc: Rename structs and list members for clarity
  target/tcm_fc: Limit to 1 TPG per wwn
  target/tcm_fc: Don't export ft_lport_list
  target/tcm_fc: Fix use-after-free of ft_tpg
  target: Add check to prevent Abort Task from aborting itself
  target: Enable READ_STRIP emulation in target_complete_ok_work
  target/sbc: Add sbc_dif_read_strip software emulation
  target: Enable WRITE_INSERT emulation in target_execute_cmd
  target/sbc: Add sbc_dif_generate software emulation
  target/sbc: Only expose PI read_cap16 bits when supported by fabric
  target/spc: Only expose PI mode page bits when supported by fabric
  target/spc: Only expose PI inquiry bits when supported by fabric
  target: Pass in transport supported PI at session initialization
  target/iblock: Fix double bioset_integrity_free bug
  Target/sbc: Initialize COMPARE_AND_WRITE write_sg scatterlist
  target/rd: T10-Dif: RAM disk is allocating more space than required.
  iscsi-target: Fix ERL=2 ASYNC_EVENT connection pointer bug
  ...

include/target/iscsi/iscsi_transport.h

@@ -21,6 +21,8 @@ struct iscsit_transport {
 	int (*iscsit_get_dataout)(struct iscsi_conn *, struct iscsi_cmd *, bool);
 	int (*iscsit_queue_data_in)(struct iscsi_conn *, struct iscsi_cmd *);
 	int (*iscsit_queue_status)(struct iscsi_conn *, struct iscsi_cmd *);
+	void (*iscsit_aborted_task)(struct iscsi_conn *, struct iscsi_cmd *);
+	enum target_prot_op (*iscsit_get_sup_prot_ops)(struct iscsi_conn *);
 };
 
 static inline void *iscsit_priv_cmd(struct iscsi_cmd *cmd)

include/target/target_core_backend.h

@@ -73,10 +73,12 @@ sense_reason_t sbc_execute_unmap(struct se_cmd *cmd,
 	sense_reason_t (*do_unmap_fn)(struct se_cmd *cmd, void *priv,
 				      sector_t lba, sector_t nolb),
 	void *priv);
+void	sbc_dif_generate(struct se_cmd *);
 sense_reason_t	sbc_dif_verify_write(struct se_cmd *, sector_t, unsigned int,
 				     unsigned int, struct scatterlist *, int);
 sense_reason_t	sbc_dif_verify_read(struct se_cmd *, sector_t, unsigned int,
 				    unsigned int, struct scatterlist *, int);
+sense_reason_t	sbc_dif_read_strip(struct se_cmd *);
 
 void	transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);
 int	transport_set_vpd_assoc(struct t10_vpd *, unsigned char *);

include/target/target_core_base.h

@@ -162,7 +162,7 @@ enum se_cmd_flags_table {
 	SCF_SENT_CHECK_CONDITION	= 0x00000800,
 	SCF_OVERFLOW_BIT		= 0x00001000,
 	SCF_UNDERFLOW_BIT		= 0x00002000,
-	SCF_SENT_DELAYED_TAS		= 0x00004000,
+	SCF_SEND_DELAYED_TAS		= 0x00004000,
 	SCF_ALUA_NON_OPTIMIZED		= 0x00008000,
 	SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC = 0x00020000,
 	SCF_ACK_KREF			= 0x00040000,
@@ -442,19 +442,18 @@ struct se_tmr_req {
 };
 
 enum target_prot_op {
-	TARGET_PROT_NORMAL = 0,
-	TARGET_PROT_DIN_INSERT,
-	TARGET_PROT_DOUT_INSERT,
-	TARGET_PROT_DIN_STRIP,
-	TARGET_PROT_DOUT_STRIP,
-	TARGET_PROT_DIN_PASS,
-	TARGET_PROT_DOUT_PASS,
+	TARGET_PROT_NORMAL	= 0,
+	TARGET_PROT_DIN_INSERT	= (1 << 0),
+	TARGET_PROT_DOUT_INSERT	= (1 << 1),
+	TARGET_PROT_DIN_STRIP	= (1 << 2),
+	TARGET_PROT_DOUT_STRIP	= (1 << 3),
+	TARGET_PROT_DIN_PASS	= (1 << 4),
+	TARGET_PROT_DOUT_PASS	= (1 << 5),
 };
 
-enum target_prot_ho {
-	PROT_SEPERATED,
-	PROT_INTERLEAVED,
-};
+#define TARGET_PROT_ALL	TARGET_PROT_DIN_INSERT | TARGET_PROT_DOUT_INSERT | \
+			TARGET_PROT_DIN_STRIP | TARGET_PROT_DOUT_STRIP | \
+			TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS
 
 enum target_prot_type {
 	TARGET_DIF_TYPE0_PROT,
@@ -463,6 +462,12 @@ enum target_prot_type {
 	TARGET_DIF_TYPE3_PROT,
 };
 
+enum target_core_dif_check {
+	TARGET_DIF_CHECK_GUARD  = 0x1 << 0,
+	TARGET_DIF_CHECK_APPTAG = 0x1 << 1,
+	TARGET_DIF_CHECK_REFTAG = 0x1 << 2,
+};
+
 struct se_dif_v1_tuple {
 	__be16			guard_tag;
 	__be16			app_tag;
@@ -556,13 +561,14 @@ struct se_cmd {
 	/* DIF related members */
 	enum target_prot_op	prot_op;
 	enum target_prot_type	prot_type;
+	u8			prot_checks;
 	u32			prot_length;
 	u32			reftag_seed;
 	struct scatterlist	*t_prot_sg;
 	unsigned int		t_prot_nents;
-	enum target_prot_ho	prot_handover;
 	sense_reason_t		pi_err;
 	sector_t		bad_sector;
+	bool			prot_pto;
 };
 
 struct se_ua {
@@ -603,6 +609,7 @@ struct se_node_acl {
 struct se_session {
 	unsigned		sess_tearing_down:1;
 	u64			sess_bin_isid;
+	enum target_prot_op	sup_prot_ops;
 	struct se_node_acl	*se_node_acl;
 	struct se_portal_group *se_tpg;
 	void			*fabric_sess_ptr;

include/target/target_core_fabric.h

@@ -62,6 +62,7 @@ struct target_core_fabric_ops {
 	int (*queue_data_in)(struct se_cmd *);
 	int (*queue_status)(struct se_cmd *);
 	void (*queue_tm_rsp)(struct se_cmd *);
+	void (*aborted_task)(struct se_cmd *);
 	/*
 	 * fabric module calls for target_core_fabric_configfs.c
 	 */
@@ -83,10 +84,11 @@ struct target_core_fabric_ops {
 	void (*fabric_drop_nodeacl)(struct se_node_acl *);
 };
 
-struct se_session *transport_init_session(void);
+struct se_session *transport_init_session(enum target_prot_op);
 int transport_alloc_session_tags(struct se_session *, unsigned int,
 		unsigned int);
-struct se_session *transport_init_session_tags(unsigned int, unsigned int);
+struct se_session *transport_init_session_tags(unsigned int, unsigned int,
+		enum target_prot_op);
 void	__transport_register_session(struct se_portal_group *,
 		struct se_node_acl *, struct se_session *, void *);
 void	transport_register_session(struct se_portal_group *,