[SCSI] bfa: Add support for user to configure bandwidth on QoS priorities

Made changes to provide an option for user to configure the
bandwidth percentage for High/Medium/Low QoS priorities.
Signed-off-by: Sudarsana Reddy Kalluru <skalluru@brocade.com>
Signed-off-by: Krishna Gudipati <kgudipat@brocade.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/bfa/bfa_defs.h

@@ -190,6 +190,8 @@ enum bfa_status {
 	BFA_STATUS_TOPOLOGY_LOOP = 230, /* Topology is set to Loop */
 	BFA_STATUS_LOOP_UNSUPP_MEZZ = 231, /* Loop topology is not supported
 					    * on mezz cards */
+	BFA_STATUS_QOS_BW_INVALID = 234,   /* Invalid QOS bandwidth
+					    * configuration */
 	BFA_STATUS_DPORT_ENABLED = 235, /* D-port mode is already enabled */
 	BFA_STATUS_DPORT_DISABLED = 236, /* D-port mode is already disabled */
 	BFA_STATUS_CMD_NOTSUPP_MEZZ = 239, /* Cmd not supported for MEZZ card */

drivers/scsi/bfa/bfa_defs_svc.h

@@ -522,6 +522,14 @@ enum bfa_qos_bw_alloc {
 	BFA_QOS_BW_LOW  =  10,	/*  bandwidth allocation for Low */
 };
 #pragma pack(1)
+
+struct bfa_qos_bw_s {
+	u8	qos_bw_set;
+	u8	high;
+	u8	med;
+	u8	low;
+};
+
 /*
  * QoS attribute returned in QoS Query
  */
@@ -529,7 +537,8 @@ struct bfa_qos_attr_s {
 	u8	state;		/*  QoS current state */
 	u8	rsvd1[3];
 	u32	total_bb_cr;	/*  Total BB Credits */
-	u32	rsvd2[2];
+	struct bfa_qos_bw_s qos_bw;	/* QOS bw cfg */
+	struct bfa_qos_bw_s qos_bw_op;	/* QOS bw operational */
 };
 
 /*
@@ -887,7 +896,7 @@ struct bfa_port_cfg_s {
 	u8	 rsvd1;
 	u16	 path_tov;	/*  device path timeout	*/
 	u16	 q_depth;	/*  SCSI Queue depth		*/
-	u32	 rsvd2;
+	struct bfa_qos_bw_s qos_bw;	/* QOS bandwidth	*/
 };
 #pragma pack()
 
@@ -935,7 +944,7 @@ struct bfa_port_attr_s {
 
 	/* FCoE specific  */
 	u16			fcoe_vlan;
-	u8			rsvd1[2];
+	u8			rsvd1[6];
 };
 
 /*

drivers/scsi/bfa/bfa_svc.c

@@ -3067,6 +3067,7 @@ bfa_fcport_attach(struct bfa_s *bfa, void *bfad, struct bfa_iocfc_cfg_s *cfg,
 	 */
 	do_gettimeofday(&tv);
 	fcport->stats_reset_time = tv.tv_sec;
+	fcport->stats_dma_ready = BFA_FALSE;
 
 	/*
 	 * initialize and set default configuration
@@ -3077,6 +3078,9 @@ bfa_fcport_attach(struct bfa_s *bfa, void *bfad, struct bfa_iocfc_cfg_s *cfg,
 	port_cfg->maxfrsize = 0;
 
 	port_cfg->trl_def_speed = BFA_PORT_SPEED_1GBPS;
+	port_cfg->qos_bw.high = BFA_QOS_BW_HIGH;
+	port_cfg->qos_bw.med = BFA_QOS_BW_MED;
+	port_cfg->qos_bw.low = BFA_QOS_BW_LOW;
 
 	INIT_LIST_HEAD(&fcport->stats_pending_q);
 	INIT_LIST_HEAD(&fcport->statsclr_pending_q);
@@ -3596,6 +3600,7 @@ bfa_fcport_isr(struct bfa_s *bfa, struct bfi_msg_s *msg)
 	case BFI_FCPORT_I2H_ENABLE_RSP:
 		if (fcport->msgtag == i2hmsg.penable_rsp->msgtag) {
 
+			fcport->stats_dma_ready = BFA_TRUE;
 			if (fcport->use_flash_cfg) {
 				fcport->cfg = i2hmsg.penable_rsp->port_cfg;
 				fcport->cfg.maxfrsize =
@@ -3611,6 +3616,8 @@ bfa_fcport_isr(struct bfa_s *bfa, struct bfi_msg_s *msg)
 				else
 					fcport->trunk.attr.state =
 						BFA_TRUNK_DISABLED;
+				fcport->qos_attr.qos_bw =
+					i2hmsg.penable_rsp->port_cfg.qos_bw;
 				fcport->use_flash_cfg = BFA_FALSE;
 			}
 
@@ -3619,6 +3626,9 @@ bfa_fcport_isr(struct bfa_s *bfa, struct bfi_msg_s *msg)
 			else
 				fcport->qos_attr.state = BFA_QOS_DISABLED;
 
+			fcport->qos_attr.qos_bw_op =
+					i2hmsg.penable_rsp->port_cfg.qos_bw;
+
 			bfa_sm_send_event(fcport, BFA_FCPORT_SM_FWRSP);
 		}
 		break;
@@ -3640,6 +3650,8 @@ bfa_fcport_isr(struct bfa_s *bfa, struct bfi_msg_s *msg)
 				bfa_sm_send_event(fcport,
 						  BFA_FCPORT_SM_LINKDOWN);
 		}
+		fcport->qos_attr.qos_bw_op =
+				i2hmsg.event->link_state.qos_attr.qos_bw_op;
 		break;
 
 	case BFI_FCPORT_I2H_TRUNK_SCN:
@@ -4035,8 +4047,9 @@ bfa_fcport_get_stats(struct bfa_s *bfa, struct bfa_cb_pending_q_s *cb)
 {
 	struct bfa_fcport_s *fcport = BFA_FCPORT_MOD(bfa);
 
-	if (bfa_ioc_is_disabled(&bfa->ioc))
-		return BFA_STATUS_IOC_DISABLED;
+	if (!bfa_iocfc_is_operational(bfa) ||
+	    !fcport->stats_dma_ready)
+		return BFA_STATUS_IOC_NON_OP;
 
 	if (!list_empty(&fcport->statsclr_pending_q))
 		return BFA_STATUS_DEVBUSY;
@@ -4061,6 +4074,10 @@ bfa_fcport_clear_stats(struct bfa_s *bfa, struct bfa_cb_pending_q_s *cb)
 {
 	struct bfa_fcport_s *fcport = BFA_FCPORT_MOD(bfa);
 
+	if (!bfa_iocfc_is_operational(bfa) ||
+	    !fcport->stats_dma_ready)
+		return BFA_STATUS_IOC_NON_OP;
+
 	if (!list_empty(&fcport->stats_pending_q))
 		return BFA_STATUS_DEVBUSY;
 
@@ -4098,6 +4115,31 @@ bfa_fcport_is_dport(struct bfa_s *bfa)
 		BFA_PORT_ST_DPORT);
 }
 
+bfa_status_t
+bfa_fcport_set_qos_bw(struct bfa_s *bfa, struct bfa_qos_bw_s *qos_bw)
+{
+	struct bfa_fcport_s *fcport = BFA_FCPORT_MOD(bfa);
+	enum bfa_ioc_type_e ioc_type = bfa_get_type(bfa);
+
+	bfa_trc(bfa, ioc_type);
+
+	if ((qos_bw->high == 0) || (qos_bw->med == 0) || (qos_bw->low == 0))
+		return BFA_STATUS_QOS_BW_INVALID;
+
+	if ((qos_bw->high + qos_bw->med + qos_bw->low) != 100)
+		return BFA_STATUS_QOS_BW_INVALID;
+
+	if ((qos_bw->med > qos_bw->high) || (qos_bw->low > qos_bw->med) ||
+	    (qos_bw->low > qos_bw->high))
+		return BFA_STATUS_QOS_BW_INVALID;
+
+	if ((ioc_type == BFA_IOC_TYPE_FC) &&
+	    (fcport->cfg.topology != BFA_PORT_TOPOLOGY_LOOP))
+		fcport->cfg.qos_bw = *qos_bw;
+
+	return BFA_STATUS_OK;
+}
+
 bfa_boolean_t
 bfa_fcport_is_ratelim(struct bfa_s *bfa)
 {

drivers/scsi/bfa/bfa_svc.h

@@ -514,6 +514,7 @@ struct bfa_fcport_s {
 	struct bfa_fcport_trunk_s trunk;
 	u16		fcoe_vlan;
 	struct bfa_mem_dma_s	fcport_dma;
+	bfa_boolean_t		stats_dma_ready;
 };
 
 #define BFA_FCPORT_MOD(__bfa)	(&(__bfa)->modules.fcport)
@@ -551,6 +552,8 @@ void bfa_fcport_event_register(struct bfa_s *bfa,
 			enum bfa_port_linkstate event), void *event_cbarg);
 bfa_boolean_t bfa_fcport_is_disabled(struct bfa_s *bfa);
 bfa_boolean_t bfa_fcport_is_dport(struct bfa_s *bfa);
+bfa_status_t bfa_fcport_set_qos_bw(struct bfa_s *bfa,
+				   struct bfa_qos_bw_s *qos_bw);
 enum bfa_port_speed bfa_fcport_get_ratelim_speed(struct bfa_s *bfa);
 
 void bfa_fcport_set_tx_bbcredit(struct bfa_s *bfa, u16 tx_bbcredit, u8 bb_scn);

drivers/scsi/bfa/bfad_bsg.c

@@ -879,6 +879,19 @@ bfad_iocmd_fabric_get_lports(struct bfad_s *bfad, void *cmd,
 	return 0;
 }
 
+int
+bfad_iocmd_qos_set_bw(struct bfad_s *bfad, void *pcmd)
+{
+	struct bfa_bsg_qos_bw_s *iocmd = (struct bfa_bsg_qos_bw_s *)pcmd;
+	unsigned long	flags;
+
+	spin_lock_irqsave(&bfad->bfad_lock, flags);
+	iocmd->status = bfa_fcport_set_qos_bw(&bfad->bfa, &iocmd->qos_bw);
+	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+
+	return 0;
+}
+
 int
 bfad_iocmd_ratelim(struct bfad_s *bfad, unsigned int cmd, void *pcmd)
 {
@@ -2284,8 +2297,12 @@ bfad_iocmd_qos(struct bfad_s *bfad, void *cmd, unsigned int v_cmd)
 		else {
 			if (v_cmd == IOCMD_QOS_ENABLE)
 				fcport->cfg.qos_enabled = BFA_TRUE;
-			else if (v_cmd == IOCMD_QOS_DISABLE)
+			else if (v_cmd == IOCMD_QOS_DISABLE) {
 				fcport->cfg.qos_enabled = BFA_FALSE;
+				fcport->cfg.qos_bw.high = BFA_QOS_BW_HIGH;
+				fcport->cfg.qos_bw.med = BFA_QOS_BW_MED;
+				fcport->cfg.qos_bw.low = BFA_QOS_BW_LOW;
+			}
 		}
 	}
 	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
@@ -2308,6 +2325,10 @@ bfad_iocmd_qos_get_attr(struct bfad_s *bfad, void *cmd)
 		iocmd->attr.state = fcport->qos_attr.state;
 		iocmd->attr.total_bb_cr =
 			be32_to_cpu(fcport->qos_attr.total_bb_cr);
+		iocmd->attr.qos_bw.high = fcport->cfg.qos_bw.high;
+		iocmd->attr.qos_bw.med = fcport->cfg.qos_bw.med;
+		iocmd->attr.qos_bw.low = fcport->cfg.qos_bw.low;
+		iocmd->attr.qos_bw_op = fcport->qos_attr.qos_bw_op;
 		iocmd->status = BFA_STATUS_OK;
 	}
 	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
@@ -2839,6 +2860,9 @@ bfad_iocmd_handler(struct bfad_s *bfad, unsigned int cmd, void *iocmd,
 	case IOCMD_QOS_RESET_STATS:
 		rc = bfad_iocmd_qos_reset_stats(bfad, iocmd);
 		break;
+	case IOCMD_QOS_SET_BW:
+		rc = bfad_iocmd_qos_set_bw(bfad, iocmd);
+		break;
 	case IOCMD_VF_GET_STATS:
 		rc = bfad_iocmd_vf_get_stats(bfad, iocmd);
 		break;

drivers/scsi/bfa/bfad_bsg.h

@@ -144,6 +144,7 @@ enum {
 	IOCMD_DIAG_DPORT_ENABLE,
 	IOCMD_DIAG_DPORT_DISABLE,
 	IOCMD_DIAG_DPORT_GET_STATE,
+	IOCMD_QOS_SET_BW,
 };
 
 struct bfa_bsg_gen_s {
@@ -704,6 +705,13 @@ struct bfa_bsg_qos_vc_attr_s {
 	struct bfa_qos_vc_attr_s attr;
 };
 
+struct bfa_bsg_qos_bw_s {
+	bfa_status_t	status;
+	u16		bfad_num;
+	u16		rsvd;
+	struct bfa_qos_bw_s qos_bw;
+};
+
 struct bfa_bsg_vf_stats_s {
 	bfa_status_t	status;
 	u16		bfad_num;