scsi: qla2xxx: Add First Burst support for FC-NVMe devices

Add Support for First Burst for FC-NVMe protocol. This feature requires
First Burst support in the firmware.
Signed-off-by: Darren Trapp <darren.trapp@cavium.com>
Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_def.h

@@ -2367,7 +2367,9 @@ typedef struct fc_port {
 #define NVME_PRLI_SP_INITIATOR  BIT_5
 #define NVME_PRLI_SP_TARGET     BIT_4
 #define NVME_PRLI_SP_DISCOVERY  BIT_3
+#define NVME_PRLI_SP_FIRST_BURST	BIT_0
 	uint8_t nvme_flag;
+	uint32_t nvme_first_burst_size;
 #define NVME_FLAG_REGISTERED 4
 #define NVME_FLAG_DELETING 2
 #define NVME_FLAG_RESETTING 1
@@ -3966,6 +3968,7 @@ struct qla_hw_data {
 	uint16_t	fw_subminor_version;
 	uint16_t	fw_attributes;
 	uint16_t	fw_attributes_h;
+#define FW_ATTR_H_NVME_FBURST 	BIT_1
 #define FW_ATTR_H_NVME		BIT_10
 #define FW_ATTR_H_NVME_UPDATED  BIT_14
 
@@ -4260,6 +4263,7 @@ typedef struct scsi_qla_host {
 		uint32_t	qpairs_req_created:1;
 		uint32_t	qpairs_rsp_created:1;
 		uint32_t	nvme_enabled:1;
+		uint32_t        nvme_first_burst:1;
 	} flags;
 
 	atomic_t	loop_state;

drivers/scsi/qla2xxx/qla_init.c

@@ -1831,6 +1831,12 @@ qla24xx_handle_prli_done_event(struct scsi_qla_host *vha, struct event_arg *ea)
 
 		ea->fcport->chip_reset = vha->hw->base_qpair->chip_reset;
 		ea->fcport->logout_on_delete = 1;
+		ea->fcport->nvme_prli_service_param = ea->iop[0];
+		if (ea->iop[0] & NVME_PRLI_SP_FIRST_BURST)
+			ea->fcport->nvme_first_burst_size =
+			    (ea->iop[1] & 0xffff) * 512;
+		else
+			ea->fcport->nvme_first_burst_size = 0;
 		qla24xx_post_gpdb_work(vha, ea->fcport, 0);
 		break;
 	default:

drivers/scsi/qla2xxx/qla_iocb.c

@@ -2419,8 +2419,11 @@ qla24xx_prli_iocb(srb_t *sp, struct logio_entry_24xx *logio)
 
 	logio->entry_type = LOGINOUT_PORT_IOCB_TYPE;
 	logio->control_flags = cpu_to_le16(LCF_COMMAND_PRLI);
-	if (lio->u.logio.flags & SRB_LOGIN_NVME_PRLI)
+	if (lio->u.logio.flags & SRB_LOGIN_NVME_PRLI) {
 		logio->control_flags |= LCF_NVME_PRLI;
+		if (sp->vha->flags.nvme_first_burst)
+			logio->io_parameter[0] = NVME_PRLI_SP_FIRST_BURST;
+	}
 
 	logio->nport_handle = cpu_to_le16(sp->fcport->loop_id);
 	logio->port_id[0] = sp->fcport->d_id.b.al_pa;

drivers/scsi/qla2xxx/qla_isr.c

@@ -1715,6 +1715,15 @@ qla24xx_logio_entry(scsi_qla_host_t *vha, struct req_que *req,
 
 		vha->hw->exch_starvation = 0;
 		data[0] = MBS_COMMAND_COMPLETE;
+
+		if (sp->type == SRB_PRLI_CMD) {
+			lio->u.logio.iop[0] =
+			    le32_to_cpu(logio->io_parameter[0]);
+			lio->u.logio.iop[1] =
+			    le32_to_cpu(logio->io_parameter[1]);
+			goto logio_done;
+		}
+
 		if (sp->type != SRB_LOGIN_CMD)
 			goto logio_done;
 

drivers/scsi/qla2xxx/qla_mbx.c

@@ -1112,6 +1112,9 @@ qla2x00_get_fw_version(scsi_qla_host_t *vha)
 		if ((ha->fw_attributes_h &
 		    (FW_ATTR_H_NVME | FW_ATTR_H_NVME_UPDATED)) &&
 			ql2xnvmeenable) {
+			if (ha->fw_attributes_h & FW_ATTR_H_NVME_FBURST)
+				vha->flags.nvme_first_burst = 1;
+
 			vha->flags.nvme_enabled = 1;
 			ql_log(ql_log_info, vha, 0xd302,
 			    "%s: FC-NVMe is Enabled (0x%x)\n",
@@ -6267,8 +6270,6 @@ int __qla24xx_parse_gpdb(struct scsi_qla_host *vha, fc_port_t *fcport,
 	fcport->d_id.b.rsvd_1 = 0;
 
 	if (fcport->fc4f_nvme) {
-		fcport->nvme_prli_service_param =
-		    pd->prli_nvme_svc_param_word_3;
 		fcport->port_type = FCT_NVME;
 	} else {
 		/* If not target must be initiator or unknown type. */

drivers/scsi/qla2xxx/qla_nvme.c

@@ -358,17 +358,24 @@ static inline int qla2x00_start_nvme_mq(srb_t *sp)
 
 	/* No data transfer how do we check buffer len == 0?? */
 	if (fd->io_dir == NVMEFC_FCP_READ) {
-		cmd_pkt->control_flags =
-		    cpu_to_le16(CF_READ_DATA | CF_NVME_ENABLE);
+		cmd_pkt->control_flags = CF_READ_DATA;
 		vha->qla_stats.input_bytes += fd->payload_length;
 		vha->qla_stats.input_requests++;
 	} else if (fd->io_dir == NVMEFC_FCP_WRITE) {
-		cmd_pkt->control_flags =
-		    cpu_to_le16(CF_WRITE_DATA | CF_NVME_ENABLE);
+		cmd_pkt->control_flags = CF_WRITE_DATA;
+		if ((vha->flags.nvme_first_burst) &&
+		    (sp->fcport->nvme_prli_service_param &
+			NVME_PRLI_SP_FIRST_BURST)) {
+			if ((fd->payload_length <=
+			    sp->fcport->nvme_first_burst_size) ||
+				(sp->fcport->nvme_first_burst_size == 0))
+				cmd_pkt->control_flags |=
+				    CF_NVME_FIRST_BURST_ENABLE;
+		}
 		vha->qla_stats.output_bytes += fd->payload_length;
 		vha->qla_stats.output_requests++;
 	} else if (fd->io_dir == 0) {
-		cmd_pkt->control_flags = cpu_to_le16(CF_NVME_ENABLE);
+		cmd_pkt->control_flags = 0;
 	}
 
 	/* Set NPORT-ID */

drivers/scsi/qla2xxx/qla_nvme.h

@@ -57,7 +57,7 @@ struct cmd_nvme {
 	uint64_t rsvd;
 
 	uint16_t control_flags;         /* Control Flags */
-#define CF_NVME_ENABLE                  BIT_9
+#define CF_NVME_FIRST_BURST_ENABLE	BIT_11
 #define CF_DIF_SEG_DESCR_ENABLE         BIT_3
 #define CF_DATA_SEG_DESCR_ENABLE        BIT_2
 #define CF_READ_DATA                    BIT_1