qla2xxx: Improve T10-DIF/PI handling in driver.

Add routines to support T10 DIF tag.
Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Anil Gurumurthy <anil.gurumurthy@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/scsi/qla2xxx/qla_dbg.h

@@ -348,6 +348,7 @@ ql_log_pci(uint32_t, struct pci_dev *pdev, int32_t, const char *fmt, ...);
 #define ql_dbg_tgt	0x00004000 /* Target mode */
 #define ql_dbg_tgt_mgt	0x00002000 /* Target mode management */
 #define ql_dbg_tgt_tmr	0x00001000 /* Target mode task management */
+#define ql_dbg_tgt_dif  0x00000800 /* Target mode dif */
 
 extern int qla27xx_dump_mpi_ram(struct qla_hw_data *, uint32_t, uint32_t *,
 	uint32_t, void **);

drivers/scsi/qla2xxx/qla_def.h

@@ -3127,6 +3127,16 @@ struct bidi_statistics {
 	unsigned long long transfer_bytes;
 };
 
+struct qla_tc_param {
+	struct scsi_qla_host *vha;
+	uint32_t blk_sz;
+	uint32_t bufflen;
+	struct scatterlist *sg;
+	struct scatterlist *prot_sg;
+	struct crc_context *ctx;
+	uint8_t *ctx_dsd_alloced;
+};
+
 /* Multi queue support */
 #define MBC_INITIALIZE_MULTIQ 0x1f
 #define QLA_QUE_PAGE 0X1000

drivers/scsi/qla2xxx/qla_gbl.h

@@ -256,11 +256,11 @@ extern unsigned long qla2x00_get_async_timeout(struct scsi_qla_host *);
 extern void *qla2x00_alloc_iocbs(scsi_qla_host_t *, srb_t *);
 extern int qla2x00_issue_marker(scsi_qla_host_t *, int);
 extern int qla24xx_walk_and_build_sglist_no_difb(struct qla_hw_data *, srb_t *,
-	uint32_t *, uint16_t, struct qla_tgt_cmd *);
+	uint32_t *, uint16_t, struct qla_tc_param *);
 extern int qla24xx_walk_and_build_sglist(struct qla_hw_data *, srb_t *,
-	uint32_t *, uint16_t, struct qla_tgt_cmd *);
+	uint32_t *, uint16_t, struct qla_tc_param *);
 extern int qla24xx_walk_and_build_prot_sglist(struct qla_hw_data *, srb_t *,
-	uint32_t *, uint16_t, struct qla_tgt_cmd *);
+	uint32_t *, uint16_t, struct qla_tc_param *);
 extern int qla24xx_get_one_block_sg(uint32_t, struct qla2_sgx *, uint32_t *);
 extern int qla24xx_configure_prot_mode(srb_t *, uint16_t *);
 extern int qla24xx_build_scsi_crc_2_iocbs(srb_t *,

drivers/scsi/qla2xxx/qla_iocb.c

@@ -889,7 +889,7 @@ qla24xx_get_one_block_sg(uint32_t blk_sz, struct qla2_sgx *sgx,
 
 int
 qla24xx_walk_and_build_sglist_no_difb(struct qla_hw_data *ha, srb_t *sp,
-	uint32_t *dsd, uint16_t tot_dsds, struct qla_tgt_cmd *tc)
+	uint32_t *dsd, uint16_t tot_dsds, struct qla_tc_param *tc)
 {
 	void *next_dsd;
 	uint8_t avail_dsds = 0;
@@ -898,7 +898,6 @@ qla24xx_walk_and_build_sglist_no_difb(struct qla_hw_data *ha, srb_t *sp,
 	struct scatterlist *sg_prot;
 	uint32_t *cur_dsd = dsd;
 	uint16_t	used_dsds = tot_dsds;
-
 	uint32_t	prot_int; /* protection interval */
 	uint32_t	partial;
 	struct qla2_sgx sgx;
@@ -966,7 +965,7 @@ qla24xx_walk_and_build_sglist_no_difb(struct qla_hw_data *ha, srb_t *sp,
 			} else {
 				list_add_tail(&dsd_ptr->list,
 				    &(tc->ctx->dsd_list));
-				tc->ctx_dsd_alloced = 1;
+				*tc->ctx_dsd_alloced = 1;
 			}
 
 
@@ -1005,7 +1004,7 @@ qla24xx_walk_and_build_sglist_no_difb(struct qla_hw_data *ha, srb_t *sp,
 
 int
 qla24xx_walk_and_build_sglist(struct qla_hw_data *ha, srb_t *sp, uint32_t *dsd,
-	uint16_t tot_dsds, struct qla_tgt_cmd *tc)
+	uint16_t tot_dsds, struct qla_tc_param *tc)
 {
 	void *next_dsd;
 	uint8_t avail_dsds = 0;
@@ -1066,7 +1065,7 @@ qla24xx_walk_and_build_sglist(struct qla_hw_data *ha, srb_t *sp, uint32_t *dsd,
 			} else {
 				list_add_tail(&dsd_ptr->list,
 				    &(tc->ctx->dsd_list));
-				tc->ctx_dsd_alloced = 1;
+				*tc->ctx_dsd_alloced = 1;
 			}
 
 			/* add new list to cmd iocb or last list */
@@ -1092,7 +1091,7 @@ qla24xx_walk_and_build_sglist(struct qla_hw_data *ha, srb_t *sp, uint32_t *dsd,
 
 int
 qla24xx_walk_and_build_prot_sglist(struct qla_hw_data *ha, srb_t *sp,
-	uint32_t *dsd, uint16_t tot_dsds, struct qla_tgt_cmd *tc)
+	uint32_t *dsd, uint16_t tot_dsds, struct qla_tc_param *tc)
 {
 	void *next_dsd;
 	uint8_t avail_dsds = 0;
@@ -1158,7 +1157,7 @@ qla24xx_walk_and_build_prot_sglist(struct qla_hw_data *ha, srb_t *sp,
 			} else {
 				list_add_tail(&dsd_ptr->list,
 				    &(tc->ctx->dsd_list));
-				tc->ctx_dsd_alloced = 1;
+				*tc->ctx_dsd_alloced = 1;
 			}
 
 			/* add new list to cmd iocb or last list */

drivers/scsi/qla2xxx/qla_target.h

@@ -378,6 +378,14 @@ static inline void adjust_corrupted_atio(struct atio_from_isp *atio)
 	atio->u.isp24.fcp_cmnd.add_cdb_len = 0;
 }
 
+static inline int get_datalen_for_atio(struct atio_from_isp *atio)
+{
+	int len = atio->u.isp24.fcp_cmnd.add_cdb_len;
+
+	return (be32_to_cpu(get_unaligned((uint32_t *)
+	    &atio->u.isp24.fcp_cmnd.add_cdb[len * 4])));
+}
+
 #define CTIO_TYPE7 0x12 /* Continue target I/O entry (for 24xx) */
 
 /*
@@ -667,7 +675,6 @@ struct qla_tgt_func_tmpl {
 	int (*handle_cmd)(struct scsi_qla_host *, struct qla_tgt_cmd *,
 			unsigned char *, uint32_t, int, int, int);
 	void (*handle_data)(struct qla_tgt_cmd *);
-	void (*handle_dif_err)(struct qla_tgt_cmd *);
 	int (*handle_tmr)(struct qla_tgt_mgmt_cmd *, uint32_t, uint16_t,
 			uint32_t);
 	void (*free_cmd)(struct qla_tgt_cmd *);
@@ -684,6 +691,8 @@ struct qla_tgt_func_tmpl {
 	void (*clear_nacl_from_fcport_map)(struct fc_port *);
 	void (*put_sess)(struct fc_port *);
 	void (*shutdown_sess)(struct fc_port *);
+	int (*get_dif_tags)(struct qla_tgt_cmd *cmd, uint16_t *pfw_prot_opts);
+	int (*chk_dif_tags)(uint32_t tag);
 };
 
 int qla2x00_wait_for_hba_online(struct scsi_qla_host *);
@@ -845,6 +854,7 @@ enum trace_flags {
 	TRC_CMD_FREE = BIT_17,
 	TRC_DATA_IN = BIT_18,
 	TRC_ABORT = BIT_19,
+	TRC_DIF_ERR = BIT_20,
 };
 
 struct qla_tgt_cmd {
@@ -862,7 +872,6 @@ struct qla_tgt_cmd {
 	unsigned int sg_mapped:1;
 	unsigned int free_sg:1;
 	unsigned int write_data_transferred:1;
-	unsigned int ctx_dsd_alloced:1;
 	unsigned int q_full:1;
 	unsigned int term_exchg:1;
 	unsigned int cmd_sent_to_fw:1;
@@ -885,11 +894,25 @@ struct qla_tgt_cmd {
 	struct list_head cmd_list;
 
 	struct atio_from_isp atio;
-	/* t10dif */
+
+	uint8_t ctx_dsd_alloced;
+
+	/* T10-DIF */
+#define DIF_ERR_NONE 0
+#define DIF_ERR_GRD 1
+#define DIF_ERR_REF 2
+#define DIF_ERR_APP 3
+	int8_t dif_err_code;
 	struct scatterlist *prot_sg;
 	uint32_t prot_sg_cnt;
-	uint32_t blk_sz;
+	uint32_t blk_sz, num_blks;
+	uint8_t scsi_status, sense_key, asc, ascq;
+
 	struct crc_context *ctx;
+	uint8_t		*cdb;
+	uint64_t	lba;
+	uint16_t	a_guard, e_guard, a_app_tag, e_app_tag;
+	uint32_t	a_ref_tag, e_ref_tag;
 
 	uint64_t jiffies_at_alloc;
 	uint64_t jiffies_at_free;
@@ -1053,4 +1076,7 @@ extern int qlt_free_qfull_cmds(struct scsi_qla_host *);
 extern void qlt_logo_completion_handler(fc_port_t *, int);
 extern void qlt_do_generation_tick(struct scsi_qla_host *, int *);
 
+void qlt_send_resp_ctio(scsi_qla_host_t *, struct qla_tgt_cmd *, uint8_t,
+    uint8_t, uint8_t, uint8_t);
+
 #endif /* __QLA_TARGET_H */

drivers/scsi/qla2xxx/tcm_qla2xxx.c

@@ -531,6 +531,24 @@ static void tcm_qla2xxx_handle_data_work(struct work_struct *work)
 			return;
 		}
 
+		switch (cmd->dif_err_code) {
+		case DIF_ERR_GRD:
+			cmd->se_cmd.pi_err =
+			    TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
+			break;
+		case DIF_ERR_REF:
+			cmd->se_cmd.pi_err =
+			    TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
+			break;
+		case DIF_ERR_APP:
+			cmd->se_cmd.pi_err =
+			    TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
+			break;
+		case DIF_ERR_NONE:
+		default:
+			break;
+		}
+
 		if (cmd->se_cmd.pi_err)
 			transport_generic_request_failure(&cmd->se_cmd,
 				cmd->se_cmd.pi_err);
@@ -555,25 +573,23 @@ static void tcm_qla2xxx_handle_data(struct qla_tgt_cmd *cmd)
 	queue_work_on(smp_processor_id(), tcm_qla2xxx_free_wq, &cmd->work);
 }
 
-static void tcm_qla2xxx_handle_dif_work(struct work_struct *work)
+static int tcm_qla2xxx_chk_dif_tags(uint32_t tag)
 {
-	struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);
-
-	/* take an extra kref to prevent cmd free too early.
-	 * need to wait for SCSI status/check condition to
-	 * finish responding generate by transport_generic_request_failure.
-	 */
-	kref_get(&cmd->se_cmd.cmd_kref);
-	transport_generic_request_failure(&cmd->se_cmd, cmd->se_cmd.pi_err);
+	return 0;
 }
 
-/*
- * Called from qla_target.c:qlt_do_ctio_completion()
- */
-static void tcm_qla2xxx_handle_dif_err(struct qla_tgt_cmd *cmd)
+static int tcm_qla2xxx_dif_tags(struct qla_tgt_cmd *cmd,
+    uint16_t *pfw_prot_opts)
 {
-	INIT_WORK(&cmd->work, tcm_qla2xxx_handle_dif_work);
-	queue_work(tcm_qla2xxx_free_wq, &cmd->work);
+	struct se_cmd *se_cmd = &cmd->se_cmd;
+
+	if (!(se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD))
+		*pfw_prot_opts |= PO_DISABLE_GUARD_CHECK;
+
+	if (!(se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG))
+		*pfw_prot_opts |= PO_DIS_APP_TAG_VALD;
+
+	return 0;
 }
 
 /*
@@ -1610,7 +1626,6 @@ static void tcm_qla2xxx_update_sess(struct fc_port *sess, port_id_t s_id,
 static struct qla_tgt_func_tmpl tcm_qla2xxx_template = {
 	.handle_cmd		= tcm_qla2xxx_handle_cmd,
 	.handle_data		= tcm_qla2xxx_handle_data,
-	.handle_dif_err		= tcm_qla2xxx_handle_dif_err,
 	.handle_tmr		= tcm_qla2xxx_handle_tmr,
 	.free_cmd		= tcm_qla2xxx_free_cmd,
 	.free_mcmd		= tcm_qla2xxx_free_mcmd,
@@ -1622,6 +1637,8 @@ static struct qla_tgt_func_tmpl tcm_qla2xxx_template = {
 	.clear_nacl_from_fcport_map = tcm_qla2xxx_clear_nacl_from_fcport_map,
 	.put_sess		= tcm_qla2xxx_put_sess,
 	.shutdown_sess		= tcm_qla2xxx_shutdown_sess,
+	.get_dif_tags		= tcm_qla2xxx_dif_tags,
+	.chk_dif_tags		= tcm_qla2xxx_chk_dif_tags,
 };
 
 static int tcm_qla2xxx_init_lport(struct tcm_qla2xxx_lport *lport)