scsi: lpfc: Fix unreleased RPIs when NPIV ports are created

While testing NPIV and watching logins and used RPI levels, it was seen the
used RPI count was much higher than the number of remote ports discovered.

Code inspection showed that remote port removals on any NPIV instance are
releasing the RPI, but not performing an UNREG_RPI with the adapter thus
the reference counting never fully drops and the RPI is never fully
released. This was happening on NPIV nodes due to a log of fabric ELS's to
fabric addresses. This lack of UNREG_RPI was introduced by a prior node
rework patch that performed the UNREG_RPI as part of node cleanup.

To resolve the issue, do the following:

 - Restore the RPI release code, but move the location to so that it is in
   line with the new node cleanup design.

 - NPIV ports now release the RPI and drop the node when the caller sets
   the NLP_RELEASE_RPI flag.

 - Set the NLP_RELEASE_RPI flag in node cleanup which will trigger a
   release of RPI to free pool.

 - Ensure there's an UNREG_RPI at LOGO completion so that RPI release is
   completed.

 - Stop offline_prep from skipping nodes that are UNUSED. The RPI may
   not have been released.

 - Stop the default RPI handling in lpfc_cmpl_els_rsp() for SLI4.

 - Fixed up debugfs RPI displays for better debugging.

Fixes: a70e63eee1c1 ("scsi: lpfc: Fix NPIV Fabric Node reference counting")
Link: https://lore.kernel.org/r/20210514195559.119853-2-jsmart2021@gmail.com
Cc: <stable@vger.kernel.org> # v5.11+
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 17 insertions, 8 deletions

diff --git a/drivers/scsi/lpfc/lpfc_nportdisc.c b/drivers/scsi/lpfc/lpfc_nportdisc.c
index bb4e65a32ecc..3dac116c405b 100644
--- a/drivers/scsi/lpfc/lpfc_nportdisc.c
+++ b/drivers/scsi/lpfc/lpfc_nportdisc.c
@@ -567,15 +567,24 @@ lpfc_rcv_plogi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
 		/* no deferred ACC */
 		kfree(save_iocb);
 
-		/* In order to preserve RPIs, we want to cleanup
-		 * the default RPI the firmware created to rcv
-		 * this ELS request. The only way to do this is
-		 * to register, then unregister the RPI.
+		/* This is an NPIV SLI4 instance that does not need to register
+		 * a default RPI.
 		 */
-		spin_lock_irq(&ndlp->lock);
-		ndlp->nlp_flag |= (NLP_RM_DFLT_RPI | NLP_ACC_REGLOGIN |
-				   NLP_RCV_PLOGI);
-		spin_unlock_irq(&ndlp->lock);
+		if (phba->sli_rev == LPFC_SLI_REV4) {
+			mempool_free(login_mbox, phba->mbox_mem_pool);
+			login_mbox = NULL;
+		} else {
+			/* In order to preserve RPIs, we want to cleanup
+			 * the default RPI the firmware created to rcv
+			 * this ELS request. The only way to do this is
+			 * to register, then unregister the RPI.
+			 */
+			spin_lock_irq(&ndlp->lock);
+			ndlp->nlp_flag |= (NLP_RM_DFLT_RPI | NLP_ACC_REGLOGIN |
+					   NLP_RCV_PLOGI);
+			spin_unlock_irq(&ndlp->lock);
+		}
+
 		stat.un.b.lsRjtRsnCode = LSRJT_INVALID_CMD;
 		stat.un.b.lsRjtRsnCodeExp = LSEXP_NOTHING_MORE;
 		rc = lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb,