[SCSI] lpfc 8.3.36: Fix bug with Target Resets and FCP2 devices

Fix bug with Target Resets and FCP2 devices

Create module parameter to disable Target Reset on FCP-Tape devices
when a "bus reset" is requested. Default is to reset all devices on
bus reset.

Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

3 files changed, 16 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
index d0ed6c19a9aa..df4c13a5534c 100644
--- a/drivers/scsi/lpfc/lpfc.h
+++ b/drivers/scsi/lpfc/lpfc.h
@@ -689,6 +689,7 @@ struct lpfc_hba {
 #define LPFC_FCF_PRIORITY 2     /* Priority fcf failover */
         uint32_t cfg_fcf_failover_policy;
         uint32_t cfg_fcp_io_sched;
+        uint32_t cfg_fcp2_no_tgt_reset;
         uint32_t cfg_cr_delay;
         uint32_t cfg_cr_count;
         uint32_t cfg_multi_ring_support;
diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index a71c7ebe7b74..a364cae9e984 100644
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -3859,6 +3859,16 @@ LPFC_ATTR_RW(fcp_io_sched, 0, 0, 1, "Determine scheduling algrithmn for "
                 "issuing commands [0] - Round Robin, [1] - Current CPU");
 
 /*
+# lpfc_fcp2_no_tgt_reset: Determine bus reset behavior
+# range is [0,1]. Default value is 0.
+# For [0], bus reset issues target reset to ALL devices
+# For [1], bus reset issues target reset to non-FCP2 devices
+*/
+LPFC_ATTR_RW(fcp2_no_tgt_reset, 0, 0, 1, "Determine bus reset behavior for "
+             "FCP2 devices [0] - issue tgt reset, [1] - no tgt reset");
+
+
+/*
 # lpfc_cr_delay & lpfc_cr_count: Default values for I/O colaesing
 # cr_delay (msec) or cr_count outstanding commands. cr_delay can take
 # value [0,63]. cr_count can take value [1,255]. Default value of cr_delay
@@ -4100,6 +4110,7 @@ struct device_attribute *lpfc_hba_attrs[] = {
         &dev_attr_lpfc_scan_down,
         &dev_attr_lpfc_link_speed,
         &dev_attr_lpfc_fcp_io_sched,
+        &dev_attr_lpfc_fcp2_no_tgt_reset,
         &dev_attr_lpfc_cr_delay,
         &dev_attr_lpfc_cr_count,
         &dev_attr_lpfc_multi_ring_support,
@@ -5091,6 +5102,7 @@ void
 lpfc_get_cfgparam(struct lpfc_hba *phba)
 {
         lpfc_fcp_io_sched_init(phba, lpfc_fcp_io_sched);
+        lpfc_fcp2_no_tgt_reset_init(phba, lpfc_fcp2_no_tgt_reset);
         lpfc_cr_delay_init(phba, lpfc_cr_delay);
         lpfc_cr_count_init(phba, lpfc_cr_count);
         lpfc_multi_ring_support_init(phba, lpfc_multi_ring_support);
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 7f45ac9964a9..fd2ff5a9e18c 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -4914,6 +4914,9 @@ lpfc_bus_reset_handler(struct scsi_cmnd *cmnd)
                 list_for_each_entry(ndlp, &vport->fc_nodes, nlp_listp) {
                         if (!NLP_CHK_NODE_ACT(ndlp))
                                 continue;
+                        if (vport->phba->cfg_fcp2_no_tgt_reset &&
+                            (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE))
+                                continue;
                         if (ndlp->nlp_state == NLP_STE_MAPPED_NODE &&
                             ndlp->nlp_sid == i &&
                             ndlp->rport) {