Commit 1045592f authored by James Smart's avatar James Smart Committed by Martin K. Petersen
Browse files

scsi: lpfc: Introduce FC_RSCN_MEMENTO flag for tracking post RSCN completion 

During an NVMe target reboot, the target may initialize itself as FCP only
during the first RSCN and shortly after trigger a second RSCN claiming NVMe
support.  The timing of these RSCNs occur before FCP-PRLI for the first
RSCN completes leading discovery issues over NVMe.

Change RSCN and NVME-PRLI send logic based on a new FC_RSCN_MEMENTO flag
that signals when lpfc_end_rscn() is completed and serves as a memento that
discovery was started from RSCN.

Link: https://lore.kernel.org/r/20220412222008.126521-20-jsmart2021@gmail.com


Co-developed-by: default avatarJustin Tee <justin.tee@broadcom.com>
Signed-off-by: default avatarJustin Tee <justin.tee@broadcom.com>
Signed-off-by: default avatarJames Smart <jsmart2021@gmail.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 6c983d32

drivers/scsi/lpfc/lpfc.h

+1 −0
Original line number Diff line number Diff line
@@ -604,6 +604,7 @@ struct lpfc_vport { 
#define FC_VFI_REGISTERED	0x800000 /* VFI is registered */

#define FC_FDISC_COMPLETED	0x1000000/* FDISC completed */

#define FC_DISC_DELAYED		0x2000000/* Delay NPort discovery */

#define FC_RSCN_MEMENTO		0x4000000/* RSCN cmd processed */



	uint32_t ct_flags;

#define FC_CT_RFF_ID		0x1	 /* RFF_ID accepted by switch */

drivers/scsi/lpfc/lpfc_els.c

+6 −2
Original line number Diff line number Diff line
@@ -1896,6 +1896,7 @@ lpfc_end_rscn(struct lpfc_vport *vport) 
		else {

			spin_lock_irq(shost->host_lock);

			vport->fc_flag &= ~FC_RSCN_MODE;

			vport->fc_flag |= FC_RSCN_MEMENTO;

			spin_unlock_irq(shost->host_lock);

		}

	}
@@ -2444,13 +2445,14 @@ lpfc_issue_els_prli(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp, 
	u32 local_nlp_type, elscmd;



	/*

	 * If we are in RSCN mode, the FC4 types supported from a

	 * If discovery was kicked off from RSCN mode,

	 * the FC4 types supported from a

	 * previous GFT_ID command may not be accurate. So, if we

	 * are a NVME Initiator, always look for the possibility of

	 * the remote NPort beng a NVME Target.

	 */

	if (phba->sli_rev == LPFC_SLI_REV4 &&

	    vport->fc_flag & FC_RSCN_MODE &&

	    vport->fc_flag & (FC_RSCN_MODE | FC_RSCN_MEMENTO) &&

	    vport->nvmei_support)

		ndlp->nlp_fc4_type |= NLP_FC4_NVME;

	local_nlp_type = ndlp->nlp_fc4_type;
@@ -7988,6 +7990,7 @@ lpfc_els_rcv_rscn(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb, 
		if ((rscn_cnt < FC_MAX_HOLD_RSCN) &&

		    !(vport->fc_flag & FC_RSCN_DISCOVERY)) {

			vport->fc_flag |= FC_RSCN_MODE;

			vport->fc_flag &= ~FC_RSCN_MEMENTO;

			spin_unlock_irq(shost->host_lock);

			if (rscn_cnt) {

				cmd = vport->fc_rscn_id_list[rscn_cnt-1]->virt;
@@ -8037,6 +8040,7 @@ lpfc_els_rcv_rscn(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb, 


	spin_lock_irq(shost->host_lock);

	vport->fc_flag |= FC_RSCN_MODE;

	vport->fc_flag &= ~FC_RSCN_MEMENTO;

	spin_unlock_irq(shost->host_lock);

	vport->fc_rscn_id_list[vport->fc_rscn_id_cnt++] = pcmd;

	/* Indicate we are done walking fc_rscn_id_list on this vport */

drivers/scsi/lpfc/lpfc_hbadisc.c

+2 −1
Original line number Diff line number Diff line
@@ -1343,7 +1343,8 @@ lpfc_linkup_port(struct lpfc_vport *vport) 


	spin_lock_irq(shost->host_lock);

	vport->fc_flag &= ~(FC_PT2PT | FC_PT2PT_PLOGI | FC_ABORT_DISCOVERY |

			    FC_RSCN_MODE | FC_NLP_MORE | FC_RSCN_DISCOVERY);

			    FC_RSCN_MEMENTO | FC_RSCN_MODE |

			    FC_NLP_MORE | FC_RSCN_DISCOVERY);

	vport->fc_flag |= FC_NDISC_ACTIVE;

	vport->fc_ns_retry = 0;

	spin_unlock_irq(shost->host_lock);