[PATCH 09/17] lpfc: Fix NPIV Fabric Node reference counting

James Smart
2020-11-15T19:27:17Z

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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.

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>
---
drivers/scsi/lpfc/lpfc_els.c | 47 +++++++++++++++++---------------
drivers/scsi/lpfc/lpfc_hbadisc.c | 29 ++++++++------------
drivers/scsi/lpfc/lpfc_init.c | 6 ++--
drivers/scsi/lpfc/lpfc_sli.c | 10 +++++--
4 files changed, 46 insertions(+), 46 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 6fc42c978730..48095bebd47b 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -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;
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
index f3cf988733c2..4c5a0ffec86f 100644
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -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;
}

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index f0cbf98e7caa..86d9ab4bcebb 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -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;
}
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 4f537a07bac6..116a6822c201 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -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.