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scsi: lpfc: Fix NPIV Fabric Node reference counting 

While testing initiator-side cable swaps with NPIV, oops occur.  The
reference counts for the Fabric nodes on the NPIV vports isn't balanced,
resulting in premature node removal.

The following fixes were made:

 - Removed the FC_LBIT check in lpfc_linkup_port. This removed the special
   case for vports that didn't have them clean up just like the physical
   port.

 - Removed the unreg_rpi call in lpfc_cleanup_node. In this section, the
   node is being removed in the context of a reference count release and a
   mailbox command can't be issued at this point.

 - Remove special case handling in the default mailbox completion handler
   that allowed the skipping of a node reference. Now, reference counting
   always requires the removal of the reference.

 - Move the location of the DEVICE_RM event is done during LOGO handling as
   the driver has additional work to do on the ndlp before puts/releases
   can be performed.

Link: https://lore.kernel.org/r/20201115192646.12977-10-james.smart@broadcom.com
Co-developed-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart 2020-11-15 11:26:38 -08:00 committed by Martin K. Petersen
parent b3f2e67cc2
commit a70e63eee1
4 changed files with 46 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
drivers/scsi/lpfc/lpfc_els.c
View File

@ -2835,8 +2835,9 @@ lpfc_cmpl_els_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
/* LOGO completes to NPort <nlp_DID> */
lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
"0105 LOGO completes to NPort x%x "
"Data: x%x x%x x%x x%x\n",
ndlp->nlp_DID, irsp->ulpStatus, irsp->un.ulpWord[4],
"refcnt %d nflags x%x Data: x%x x%x x%x x%x\n",
ndlp->nlp_DID, kref_read(&ndlp->kref), ndlp->nlp_flag,
irsp->ulpStatus, irsp->un.ulpWord[4],
irsp->ulpTimeout, vport->num_disc_nodes);
if (lpfc_els_chk_latt(vport)) {
@ -2844,17 +2845,6 @@ lpfc_cmpl_els_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
goto out;
}
/* Check to see if link went down during discovery */
if (ndlp->nlp_flag & NLP_TARGET_REMOVE) {
/* NLP_EVT_DEVICE_RM should unregister the RPI
* which should abort all outstanding IOs.
*/
lpfc_disc_state_machine(vport, ndlp, cmdiocb,
NLP_EVT_DEVICE_RM);
skip_recovery = 1;
goto out;
}
/* The LOGO will not be retried on failure. A LOGO was
* issued to the remote rport and a ACC or RJT or no Answer are
* all acceptable. Note the failure and move forward with
@ -2876,6 +2866,19 @@ lpfc_cmpl_els_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
/* Call state machine. This will unregister the rpi if needed. */
lpfc_disc_state_machine(vport, ndlp, cmdiocb, NLP_EVT_CMPL_LOGO);
/* The driver sets this flag for an NPIV instance that doesn't want to
* log into the remote port.
*/
if (ndlp->nlp_flag & NLP_TARGET_REMOVE) {
lpfc_disc_state_machine(vport, ndlp, cmdiocb,
NLP_EVT_DEVICE_RM);
lpfc_els_free_iocb(phba, cmdiocb);
lpfc_nlp_put(ndlp);
/* Presume the node was released. */
return;
}
out:
/* Driver is done with the IO. */
lpfc_els_free_iocb(phba, cmdiocb);
@ -4399,10 +4402,10 @@ lpfc_cmpl_els_logo_acc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
irsp->ulpStatus, irsp->un.ulpWord[4], ndlp->nlp_DID);
/* ACC to LOGO completes to NPort <nlp_DID> */
lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
"0109 ACC to LOGO completes to NPort x%x "
"0109 ACC to LOGO completes to NPort x%x refcnt %d"
"Data: x%x x%x x%x\n",
ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state,
ndlp->nlp_rpi);
ndlp->nlp_DID, kref_read(&ndlp->kref), ndlp->nlp_flag,
ndlp->nlp_state, ndlp->nlp_rpi);
if (ndlp->nlp_state == NLP_STE_NPR_NODE) {
/* NPort Recovery mode or node is just allocated */
@ -8650,9 +8653,9 @@ lpfc_els_unsol_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
/* ELS command <elsCmd> received from NPORT <did> */
lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
"0112 ELS command x%x received from NPORT x%x "
"Data: x%x x%x x%x x%x\n",
cmd, did, vport->port_state, vport->fc_flag,
vport->fc_myDID, vport->fc_prevDID);
"refcnt %d Data: x%x x%x x%x x%x\n",
cmd, did, kref_read(&ndlp->kref), vport->port_state,
vport->fc_flag, vport->fc_myDID, vport->fc_prevDID);
/* reject till our FLOGI completes or PLOGI assigned DID via PT2PT */
if ((vport->port_state < LPFC_FABRIC_CFG_LINK) &&
@ -9144,9 +9147,9 @@ lpfc_do_scr_ns_plogi(struct lpfc_hba *phba, struct lpfc_vport *vport)
spin_lock_irq(shost->host_lock);
if (vport->fc_flag & FC_DISC_DELAYED) {
spin_unlock_irq(shost->host_lock);
lpfc_printf_log(phba, KERN_ERR, LOG_TRACE_EVENT,
"3334 Delay fc port discovery for %d seconds\n",
phba->fc_ratov);
lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
"3334 Delay fc port discovery for %d secs\n",
phba->fc_ratov);
mod_timer(&vport->delayed_disc_tmo,
jiffies + msecs_to_jiffies(1000 * phba->fc_ratov));
return;

29
drivers/scsi/lpfc/lpfc_hbadisc.c
View File

@ -4810,8 +4810,14 @@ lpfc_set_unreg_login_mbx_cmpl(struct lpfc_hba *phba, struct lpfc_vport *vport,
{
unsigned long iflags;
/* Driver always gets a reference on the mailbox job
* in support of async jobs.
*/
mbox->ctx_ndlp = lpfc_nlp_get(ndlp);
if (!mbox->ctx_ndlp)
return;
if (ndlp->nlp_flag & NLP_ISSUE_LOGO) {
mbox->ctx_ndlp = ndlp;
mbox->mbox_cmpl = lpfc_nlp_logo_unreg;
} else if (phba->sli_rev == LPFC_SLI_REV4 &&
@ -4819,7 +4825,6 @@ lpfc_set_unreg_login_mbx_cmpl(struct lpfc_hba *phba, struct lpfc_vport *vport,
(bf_get(lpfc_sli_intf_if_type, &phba->sli4_hba.sli_intf) >=
LPFC_SLI_INTF_IF_TYPE_2) &&
(kref_read(&ndlp->kref) > 0)) {
mbox->ctx_ndlp = lpfc_nlp_get(ndlp);
mbox->mbox_cmpl = lpfc_sli4_unreg_rpi_cmpl_clr;
} else {
if (vport->load_flag & FC_UNLOADING) {
@ -4828,9 +4833,7 @@ lpfc_set_unreg_login_mbx_cmpl(struct lpfc_hba *phba, struct lpfc_vport *vport,
ndlp->nlp_flag |= NLP_RELEASE_RPI;
spin_unlock_irqrestore(&ndlp->lock, iflags);
}
lpfc_nlp_get(ndlp);
}
mbox->ctx_ndlp = ndlp;
mbox->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
}
}
@ -4888,6 +4891,11 @@ lpfc_unreg_rpi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
lpfc_unreg_login(phba, vport->vpi, rpi, mbox);
mbox->vport = vport;
lpfc_set_unreg_login_mbx_cmpl(phba, vport, ndlp, mbox);
if (!mbox->ctx_ndlp) {
mempool_free(mbox, phba->mbox_mem_pool);
return 1;
}
if (mbox->mbox_cmpl == lpfc_sli4_unreg_rpi_cmpl_clr)
/*
* accept PLOGIs after unreg_rpi_cmpl
@ -5057,7 +5065,6 @@ lpfc_cleanup_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
struct lpfc_hba *phba = vport->phba;
LPFC_MBOXQ_t *mb, *nextmb;
struct lpfc_dmabuf *mp;
unsigned long iflags;
/* Cleanup node for NPort <nlp_DID> */
lpfc_printf_vlog(vport, KERN_INFO, LOG_NODE,
@ -5125,18 +5132,6 @@ lpfc_cleanup_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
lpfc_cleanup_vports_rrqs(vport, ndlp);
if (phba->sli_rev == LPFC_SLI_REV4)
ndlp->nlp_flag |= NLP_RELEASE_RPI;
if (!lpfc_unreg_rpi(vport, ndlp)) {
/* Clean up unregistered and non freed rpis */
if ((ndlp->nlp_flag & NLP_RELEASE_RPI) &&
!(ndlp->nlp_rpi == LPFC_RPI_ALLOC_ERROR)) {
lpfc_sli4_free_rpi(vport->phba,
ndlp->nlp_rpi);
spin_lock_irqsave(&ndlp->lock, iflags);
ndlp->nlp_flag &= ~NLP_RELEASE_RPI;
ndlp->nlp_rpi = LPFC_RPI_ALLOC_ERROR;
spin_unlock_irqrestore(&ndlp->lock, iflags);
}
}
return 0;
}

6
drivers/scsi/lpfc/lpfc_init.c
View File

@ -2851,10 +2851,8 @@ lpfc_cleanup(struct lpfc_vport *vport)
continue;
}
/* take care of nodes in unused state before the state
* machine taking action.
*/
if (ndlp->nlp_state == NLP_STE_UNUSED_NODE) {
if (ndlp->nlp_DID == Fabric_Cntl_DID &&
ndlp->nlp_state == NLP_STE_UNUSED_NODE) {
lpfc_nlp_put(ndlp);
continue;
}

10
drivers/scsi/lpfc/lpfc_sli.c
View File

@ -2541,8 +2541,12 @@ lpfc_sli_def_mbox_cmpl(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
} else {
__lpfc_sli_rpi_release(vport, ndlp);
}
if (vport->load_flag & FC_UNLOADING)
lpfc_nlp_put(ndlp);
/* The unreg_login mailbox is complete and had a
* reference that has to be released. The PLOGI
* got its own ref.
*/
lpfc_nlp_put(ndlp);
pmb->ctx_ndlp = NULL;
}
}
@ -2566,7 +2570,7 @@ lpfc_sli_def_mbox_cmpl(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
*
* This function is the unreg rpi mailbox completion handler. It
* frees the memory resources associated with the completed mailbox
* command. An additional refrenece is put on the ndlp to prevent
* command. An additional reference is put on the ndlp to prevent
* lpfc_nlp_release from freeing the rpi bit in the bitmask before
* the unreg mailbox command completes, this routine puts the
* reference back.