From: Justin Tee <justin.tee@xxxxxxxxxxxx> [ Upstream commit b5c18c9dd138733c16893613345af44deadcf05e ] In direct attached topology, certain target vendors that are quick to issue FLOGI followed by a cable pull for more than dev_loss_tmo may result in a kref imbalance for the remote port ndlp object. Add an nlp_get when the defer_flogi_acc flag is set. This is expected to balance the nlp_put in the defer_flogi_acc clause in the lpfc_issue_els_flogi() routine. Because we need to retain the ndlp ptr, reorganize all of the defer_flogi_acc information into one lpfc_defer_flogi_acc struct. Signed-off-by: Justin Tee <justin.tee@xxxxxxxxxxxx> Link: https://lore.kernel.org/r/20240726231512.92867-6-justintee8345@xxxxxxxxx Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/scsi/lpfc/lpfc.h | 12 ++++++--- drivers/scsi/lpfc/lpfc_els.c | 46 +++++++++++++++++++------------- drivers/scsi/lpfc/lpfc_hbadisc.c | 11 ++++++-- 3 files changed, 46 insertions(+), 23 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h index 7c147d6ea8a8f..e5a9c5a323f8b 100644 --- a/drivers/scsi/lpfc/lpfc.h +++ b/drivers/scsi/lpfc/lpfc.h @@ -306,6 +306,14 @@ struct lpfc_stats { struct lpfc_hba; +/* Data structure to keep withheld FLOGI_ACC information */ +struct lpfc_defer_flogi_acc { + bool flag; + u16 rx_id; + u16 ox_id; + struct lpfc_nodelist *ndlp; + +}; #define LPFC_VMID_TIMER 300 /* timer interval in seconds */ @@ -1430,9 +1438,7 @@ struct lpfc_hba { uint16_t vlan_id; struct list_head fcf_conn_rec_list; - bool defer_flogi_acc_flag; - uint16_t defer_flogi_acc_rx_id; - uint16_t defer_flogi_acc_ox_id; + struct lpfc_defer_flogi_acc defer_flogi_acc; spinlock_t ct_ev_lock; /* synchronize access to ct_ev_waiters */ struct list_head ct_ev_waiters; diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c index 929cbfc95163b..8c0926ffee1bf 100644 --- a/drivers/scsi/lpfc/lpfc_els.c +++ b/drivers/scsi/lpfc/lpfc_els.c @@ -1390,7 +1390,7 @@ lpfc_issue_els_flogi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp, phba->link_flag &= ~LS_EXTERNAL_LOOPBACK; /* Check for a deferred FLOGI ACC condition */ - if (phba->defer_flogi_acc_flag) { + if (phba->defer_flogi_acc.flag) { /* lookup ndlp for received FLOGI */ ndlp = lpfc_findnode_did(vport, 0); if (!ndlp) @@ -1404,34 +1404,38 @@ lpfc_issue_els_flogi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp, if (phba->sli_rev == LPFC_SLI_REV4) { bf_set(wqe_ctxt_tag, &defer_flogi_acc.wqe.xmit_els_rsp.wqe_com, - phba->defer_flogi_acc_rx_id); + phba->defer_flogi_acc.rx_id); bf_set(wqe_rcvoxid, &defer_flogi_acc.wqe.xmit_els_rsp.wqe_com, - phba->defer_flogi_acc_ox_id); + phba->defer_flogi_acc.ox_id); } else { icmd = &defer_flogi_acc.iocb; - icmd->ulpContext = phba->defer_flogi_acc_rx_id; + icmd->ulpContext = phba->defer_flogi_acc.rx_id; icmd->unsli3.rcvsli3.ox_id = - phba->defer_flogi_acc_ox_id; + phba->defer_flogi_acc.ox_id; } lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS, "3354 Xmit deferred FLOGI ACC: rx_id: x%x," " ox_id: x%x, hba_flag x%lx\n", - phba->defer_flogi_acc_rx_id, - phba->defer_flogi_acc_ox_id, phba->hba_flag); + phba->defer_flogi_acc.rx_id, + phba->defer_flogi_acc.ox_id, phba->hba_flag); /* Send deferred FLOGI ACC */ lpfc_els_rsp_acc(vport, ELS_CMD_FLOGI, &defer_flogi_acc, ndlp, NULL); - phba->defer_flogi_acc_flag = false; - vport->fc_myDID = did; + phba->defer_flogi_acc.flag = false; - /* Decrement ndlp reference count to indicate the node can be - * released when other references are removed. + /* Decrement the held ndlp that was incremented when the + * deferred flogi acc flag was set. */ - lpfc_nlp_put(ndlp); + if (phba->defer_flogi_acc.ndlp) { + lpfc_nlp_put(phba->defer_flogi_acc.ndlp); + phba->defer_flogi_acc.ndlp = NULL; + } + + vport->fc_myDID = did; } return 0; @@ -8454,9 +8458,9 @@ lpfc_els_rcv_flogi(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb, /* Defer ACC response until AFTER we issue a FLOGI */ if (!test_bit(HBA_FLOGI_ISSUED, &phba->hba_flag)) { - phba->defer_flogi_acc_rx_id = bf_get(wqe_ctxt_tag, + phba->defer_flogi_acc.rx_id = bf_get(wqe_ctxt_tag, &wqe->xmit_els_rsp.wqe_com); - phba->defer_flogi_acc_ox_id = bf_get(wqe_rcvoxid, + phba->defer_flogi_acc.ox_id = bf_get(wqe_rcvoxid, &wqe->xmit_els_rsp.wqe_com); vport->fc_myDID = did; @@ -8464,11 +8468,17 @@ lpfc_els_rcv_flogi(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb, lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS, "3344 Deferring FLOGI ACC: rx_id: x%x," " ox_id: x%x, hba_flag x%lx\n", - phba->defer_flogi_acc_rx_id, - phba->defer_flogi_acc_ox_id, phba->hba_flag); + phba->defer_flogi_acc.rx_id, + phba->defer_flogi_acc.ox_id, phba->hba_flag); - phba->defer_flogi_acc_flag = true; + phba->defer_flogi_acc.flag = true; + /* This nlp_get is paired with nlp_puts that reset the + * defer_flogi_acc.flag back to false. We need to retain + * a kref on the ndlp until the deferred FLOGI ACC is + * processed or cancelled. + */ + phba->defer_flogi_acc.ndlp = lpfc_nlp_get(ndlp); return 0; } @@ -10504,7 +10514,7 @@ lpfc_els_unsol_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring, lpfc_els_rcv_flogi(vport, elsiocb, ndlp); /* retain node if our response is deferred */ - if (phba->defer_flogi_acc_flag) + if (phba->defer_flogi_acc.flag) break; if (newnode) lpfc_disc_state_machine(vport, ndlp, NULL, diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c index f21c5993e8d72..35c9181c6608a 100644 --- a/drivers/scsi/lpfc/lpfc_hbadisc.c +++ b/drivers/scsi/lpfc/lpfc_hbadisc.c @@ -1255,7 +1255,14 @@ lpfc_linkdown(struct lpfc_hba *phba) lpfc_scsi_dev_block(phba); offline = pci_channel_offline(phba->pcidev); - phba->defer_flogi_acc_flag = false; + /* Decrement the held ndlp if there is a deferred flogi acc */ + if (phba->defer_flogi_acc.flag) { + if (phba->defer_flogi_acc.ndlp) { + lpfc_nlp_put(phba->defer_flogi_acc.ndlp); + phba->defer_flogi_acc.ndlp = NULL; + } + } + phba->defer_flogi_acc.flag = false; /* Clear external loopback plug detected flag */ phba->link_flag &= ~LS_EXTERNAL_LOOPBACK; @@ -1377,7 +1384,7 @@ lpfc_linkup_port(struct lpfc_vport *vport) (vport != phba->pport)) return; - if (phba->defer_flogi_acc_flag) { + if (phba->defer_flogi_acc.flag) { clear_bit(FC_ABORT_DISCOVERY, &vport->fc_flag); clear_bit(FC_RSCN_MODE, &vport->fc_flag); clear_bit(FC_NLP_MORE, &vport->fc_flag); -- 2.43.0
