[SCSI] lpfc 8.1.2: Modify RSCN handling to unregister rpis on lost FCP_TARGETs immediately

Modify RSCN handling to unregister rpis on lost FCP_TARGETs immediately

Signed-off-by: Jamie Wellnitz <Jamie.Wellnitz@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 30 insertions, 1 deletions

diff --git a/drivers/scsi/lpfc/lpfc_ct.c b/drivers/scsi/lpfc/lpfc_ct.c
index eab087bf826e..0c982bbc4c77 100644
--- a/drivers/scsi/lpfc/lpfc_ct.c
+++ b/drivers/scsi/lpfc/lpfc_ct.c
@@ -323,6 +323,7 @@ lpfc_ns_rsp(struct lpfc_hba * phba, struct lpfc_dmabuf * mp, uint32_t Size)
         struct lpfc_sli_ct_request *Response =
                 (struct lpfc_sli_ct_request *) mp->virt;
         struct lpfc_nodelist *ndlp = NULL;
+        struct lpfc_nodelist *next_ndlp;
         struct lpfc_dmabuf *mlast, *next_mp;
         uint32_t *ctptr = (uint32_t *) & Response->un.gid.PortType;
         uint32_t Did;
@@ -391,8 +392,36 @@ lpfc_ns_rsp(struct lpfc_hba * phba, struct lpfc_dmabuf * mp, uint32_t Size)
 nsout1:
         list_del(&head);
 
-        /* Here we are finished in the case RSCN */
+        /*
+         * The driver has cycled through all Nports in the RSCN payload.
+         * Complete the handling by cleaning up and marking the
+         * current driver state.
+         */
         if (phba->hba_state == LPFC_HBA_READY) {
+
+                /*
+                 * Switch ports that connect a loop of multiple targets need
+                 * special consideration.  The driver wants to unregister the
+                 * rpi only on the target that was pulled from the loop.  On
+                 * RSCN, the driver wants to rediscover an NPort only if the
+                 * driver flagged it as NLP_NPR_2B_DISC.  Provided adisc is
+                 * not enabled and the NPort is not capable of retransmissions
+                 * (FC Tape) prevent timing races with the scsi error handler by
+                 * unregistering the Nport's RPI.  This action causes all
+                 * outstanding IO to flush back to the midlayer.
+                 */
+                list_for_each_entry_safe(ndlp, next_ndlp, &phba->fc_npr_list,
+                                         nlp_listp) {
+                        if (!(ndlp->nlp_flag & NLP_NPR_2B_DISC) &&
+                            (lpfc_rscn_payload_check(phba, ndlp->nlp_DID))) {
+                                if ((phba->cfg_use_adisc == 0) &&
+                                    !(ndlp->nlp_fcp_info &
+                                      NLP_FCP_2_DEVICE)) {
+                                        lpfc_unreg_rpi(phba, ndlp);
+                                        ndlp->nlp_flag &= ~NLP_NPR_ADISC;
+                                }
+                        }
+                }
                 lpfc_els_flush_rscn(phba);
                 spin_lock_irq(phba->host->host_lock);
                 phba->fc_flag |= FC_RSCN_MODE; /* we are still in RSCN mode */