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scsi: lpfc: Implement GID_PT on Nameserver query to support faster failover 

The switches seem to respond faster to GID_PT vs GID_FT NameServer
queries.  Add support for GID_PT to be used over GID_FT to enable
faster storage failover detection. Includes addition of new module
parameter to select between GID_PT and GID_FT (GID_FT is default).

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart 2018-10-23 13:41:10 -07:00 committed by Martin K. Petersen
parent d83ca3ea83
commit 7ea92eb458
9 changed files with 275 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/scsi/lpfc/lpfc.h
View File

@ -784,6 +784,7 @@ 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_ns_query;
uint32_t cfg_fcp2_no_tgt_reset;
uint32_t cfg_cr_delay;
uint32_t cfg_cr_count;

14
drivers/scsi/lpfc/lpfc_attr.c
View File

@ -5069,6 +5069,18 @@ LPFC_ATTR_RW(fcp_io_sched, LPFC_FCP_SCHED_ROUND_ROBIN,
"Determine scheduling algorithm for "
"issuing commands [0] - Round Robin, [1] - Current CPU");
/*
* lpfc_ns_query: Determine algrithmn for NameServer queries after RSCN
* range is [0,1]. Default value is 0.
* For [0], GID_FT is used for NameServer queries after RSCN (default)
* For [1], GID_PT is used for NameServer queries after RSCN
*
*/
LPFC_ATTR_RW(ns_query, LPFC_NS_QUERY_GID_FT,
LPFC_NS_QUERY_GID_FT, LPFC_NS_QUERY_GID_PT,
"Determine algorithm NameServer queries after RSCN "
"[0] - GID_FT, [1] - GID_PT");
/*
# lpfc_fcp2_no_tgt_reset: Determine bus reset behavior
# range is [0,1]. Default value is 0.
@ -5514,6 +5526,7 @@ 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_ns_query,
&dev_attr_lpfc_fcp2_no_tgt_reset,
&dev_attr_lpfc_cr_delay,
&dev_attr_lpfc_cr_count,
@ -6564,6 +6577,7 @@ void
lpfc_get_cfgparam(struct lpfc_hba *phba)
{
lpfc_fcp_io_sched_init(phba, lpfc_fcp_io_sched);
lpfc_ns_query_init(phba, lpfc_ns_query);
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);

1
drivers/scsi/lpfc/lpfc_crtn.h
View File

@ -175,6 +175,7 @@ void lpfc_hb_timeout_handler(struct lpfc_hba *);
void lpfc_ct_unsol_event(struct lpfc_hba *, struct lpfc_sli_ring *,
struct lpfc_iocbq *);
int lpfc_ct_handle_unsol_abort(struct lpfc_hba *, struct hbq_dmabuf *);
int lpfc_issue_gidpt(struct lpfc_vport *vport);
int lpfc_issue_gidft(struct lpfc_vport *vport);
int lpfc_get_gidft_type(struct lpfc_vport *vport, struct lpfc_iocbq *iocbq);
int lpfc_ns_cmd(struct lpfc_vport *, int, uint8_t, uint32_t);

206
drivers/scsi/lpfc/lpfc_ct.c
View File

@ -831,6 +831,198 @@ out:
return;
}
static void
lpfc_cmpl_ct_cmd_gid_pt(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
struct lpfc_iocbq *rspiocb)
{
struct lpfc_vport *vport = cmdiocb->vport;
struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
IOCB_t *irsp;
struct lpfc_dmabuf *outp;
struct lpfc_dmabuf *inp;
struct lpfc_sli_ct_request *CTrsp;
struct lpfc_sli_ct_request *CTreq;
struct lpfc_nodelist *ndlp;
int rc;
/* First save ndlp, before we overwrite it */
ndlp = cmdiocb->context_un.ndlp;
/* we pass cmdiocb to state machine which needs rspiocb as well */
cmdiocb->context_un.rsp_iocb = rspiocb;
inp = (struct lpfc_dmabuf *)cmdiocb->context1;
outp = (struct lpfc_dmabuf *)cmdiocb->context2;
irsp = &rspiocb->iocb;
lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_CT,
"GID_PT cmpl: status:x%x/x%x rtry:%d",
irsp->ulpStatus, irsp->un.ulpWord[4],
vport->fc_ns_retry);
/* Don't bother processing response if vport is being torn down. */
if (vport->load_flag & FC_UNLOADING) {
if (vport->fc_flag & FC_RSCN_MODE)
lpfc_els_flush_rscn(vport);
goto out;
}
if (lpfc_els_chk_latt(vport)) {
lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
"4108 Link event during NS query\n");
if (vport->fc_flag & FC_RSCN_MODE)
lpfc_els_flush_rscn(vport);
lpfc_vport_set_state(vport, FC_VPORT_FAILED);
goto out;
}
if (lpfc_error_lost_link(irsp)) {
lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
"4101 NS query failed due to link event\n");
if (vport->fc_flag & FC_RSCN_MODE)
lpfc_els_flush_rscn(vport);
goto out;
}
spin_lock_irq(shost->host_lock);
if (vport->fc_flag & FC_RSCN_DEFERRED) {
vport->fc_flag &= ~FC_RSCN_DEFERRED;
spin_unlock_irq(shost->host_lock);
/* This is a GID_PT completing so the gidft_inp counter was
* incremented before the GID_PT was issued to the wire.
*/
vport->gidft_inp--;
/*
* Skip processing the NS response
* Re-issue the NS cmd
*/
lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
"4102 Process Deferred RSCN Data: x%x x%x\n",
vport->fc_flag, vport->fc_rscn_id_cnt);
lpfc_els_handle_rscn(vport);
goto out;
}
spin_unlock_irq(shost->host_lock);
if (irsp->ulpStatus) {
/* Check for retry */
if (vport->fc_ns_retry < LPFC_MAX_NS_RETRY) {
if (irsp->ulpStatus != IOSTAT_LOCAL_REJECT ||
(irsp->un.ulpWord[4] & IOERR_PARAM_MASK) !=
IOERR_NO_RESOURCES)
vport->fc_ns_retry++;
/* CT command is being retried */
vport->gidft_inp--;
rc = lpfc_ns_cmd(vport, SLI_CTNS_GID_PT,
vport->fc_ns_retry, GID_PT_N_PORT);
if (rc == 0)
goto out;
}
if (vport->fc_flag & FC_RSCN_MODE)
lpfc_els_flush_rscn(vport);
lpfc_vport_set_state(vport, FC_VPORT_FAILED);
lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
"4103 GID_FT Query error: 0x%x 0x%x\n",
irsp->ulpStatus, vport->fc_ns_retry);
} else {
/* Good status, continue checking */
CTreq = (struct lpfc_sli_ct_request *)inp->virt;
CTrsp = (struct lpfc_sli_ct_request *)outp->virt;
if (CTrsp->CommandResponse.bits.CmdRsp ==
cpu_to_be16(SLI_CT_RESPONSE_FS_ACC)) {
lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
"4105 NameServer Rsp Data: x%x x%x\n",
vport->fc_flag,
CTreq->un.gid.Fc4Type);
lpfc_ns_rsp(vport,
outp,
CTreq->un.gid.Fc4Type,
(uint32_t)(irsp->un.genreq64.bdl.bdeSize));
} else if (CTrsp->CommandResponse.bits.CmdRsp ==
be16_to_cpu(SLI_CT_RESPONSE_FS_RJT)) {
/* NameServer Rsp Error */
if ((CTrsp->ReasonCode == SLI_CT_UNABLE_TO_PERFORM_REQ)
&& (CTrsp->Explanation == SLI_CT_NO_FC4_TYPES)) {
lpfc_printf_vlog(
vport, KERN_INFO, LOG_DISCOVERY,
"4106 No NameServer Entries "
"Data: x%x x%x x%x x%x\n",
CTrsp->CommandResponse.bits.CmdRsp,
(uint32_t)CTrsp->ReasonCode,
(uint32_t)CTrsp->Explanation,
vport->fc_flag);
lpfc_debugfs_disc_trc(
vport, LPFC_DISC_TRC_CT,
"GID_PT no entry cmd:x%x rsn:x%x exp:x%x",
(uint32_t)CTrsp->CommandResponse.bits.CmdRsp,
(uint32_t)CTrsp->ReasonCode,
(uint32_t)CTrsp->Explanation);
} else {
lpfc_printf_vlog(
vport, KERN_INFO, LOG_DISCOVERY,
"4107 NameServer Rsp Error "
"Data: x%x x%x x%x x%x\n",
CTrsp->CommandResponse.bits.CmdRsp,
(uint32_t)CTrsp->ReasonCode,
(uint32_t)CTrsp->Explanation,
vport->fc_flag);
lpfc_debugfs_disc_trc(
vport, LPFC_DISC_TRC_CT,
"GID_PT rsp err1 cmd:x%x rsn:x%x exp:x%x",
(uint32_t)CTrsp->CommandResponse.bits.CmdRsp,
(uint32_t)CTrsp->ReasonCode,
(uint32_t)CTrsp->Explanation);
}
} else {
/* NameServer Rsp Error */
lpfc_printf_vlog(vport, KERN_ERR, LOG_DISCOVERY,
"4109 NameServer Rsp Error "
"Data: x%x x%x x%x x%x\n",
CTrsp->CommandResponse.bits.CmdRsp,
(uint32_t)CTrsp->ReasonCode,
(uint32_t)CTrsp->Explanation,
vport->fc_flag);
lpfc_debugfs_disc_trc(
vport, LPFC_DISC_TRC_CT,
"GID_PT rsp err2 cmd:x%x rsn:x%x exp:x%x",
(uint32_t)CTrsp->CommandResponse.bits.CmdRsp,
(uint32_t)CTrsp->ReasonCode,
(uint32_t)CTrsp->Explanation);
}
vport->gidft_inp--;
}
/* Link up / RSCN discovery */
if ((vport->num_disc_nodes == 0) &&
(vport->gidft_inp == 0)) {
/*
* The driver has cycled through all Nports in the RSCN payload.
* Complete the handling by cleaning up and marking the
* current driver state.
*/
if (vport->port_state >= LPFC_DISC_AUTH) {
if (vport->fc_flag & FC_RSCN_MODE) {
lpfc_els_flush_rscn(vport);
spin_lock_irq(shost->host_lock);
vport->fc_flag |= FC_RSCN_MODE; /* RSCN still */
spin_unlock_irq(shost->host_lock);
} else {
lpfc_els_flush_rscn(vport);
}
}
lpfc_disc_start(vport);
}
out:
cmdiocb->context_un.ndlp = ndlp; /* Now restore ndlp for free */
lpfc_ct_free_iocb(phba, cmdiocb);
}
static void
lpfc_cmpl_ct_cmd_gff_id(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
struct lpfc_iocbq *rspiocb)
@ -1365,6 +1557,8 @@ lpfc_ns_cmd(struct lpfc_vport *vport, int cmdcode,
bpl->tus.f.bdeFlags = 0;
if (cmdcode == SLI_CTNS_GID_FT)
bpl->tus.f.bdeSize = GID_REQUEST_SZ;
else if (cmdcode == SLI_CTNS_GID_PT)
bpl->tus.f.bdeSize = GID_REQUEST_SZ;
else if (cmdcode == SLI_CTNS_GFF_ID)
bpl->tus.f.bdeSize = GFF_REQUEST_SZ;
else if (cmdcode == SLI_CTNS_GFT_ID)
@ -1405,6 +1599,18 @@ lpfc_ns_cmd(struct lpfc_vport *vport, int cmdcode,
rsp_size = FC_MAX_NS_RSP;
break;
case SLI_CTNS_GID_PT:
CtReq->CommandResponse.bits.CmdRsp =
cpu_to_be16(SLI_CTNS_GID_PT);
CtReq->un.gid.PortType = context;
if (vport->port_state < LPFC_NS_QRY)
vport->port_state = LPFC_NS_QRY;
lpfc_set_disctmo(vport);
cmpl = lpfc_cmpl_ct_cmd_gid_pt;
rsp_size = FC_MAX_NS_RSP;
break;
case SLI_CTNS_GFF_ID:
CtReq->CommandResponse.bits.CmdRsp =
cpu_to_be16(SLI_CTNS_GFF_ID);

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

@ -6371,6 +6371,7 @@ int
lpfc_els_handle_rscn(struct lpfc_vport *vport)
{
struct lpfc_nodelist *ndlp;
struct lpfc_hba *phba = vport->phba;
/* Ignore RSCN if the port is being torn down. */
if (vport->load_flag & FC_UNLOADING) {
@ -6399,8 +6400,15 @@ lpfc_els_handle_rscn(struct lpfc_vport *vport)
* flush the RSCN. Otherwise, the outstanding requests
* need to complete.
*/
if (lpfc_issue_gidft(vport) > 0)
if (phba->cfg_ns_query == LPFC_NS_QUERY_GID_FT) {
if (lpfc_issue_gidft(vport) > 0)
return 1;
} else if (phba->cfg_ns_query == LPFC_NS_QUERY_GID_PT) {
if (lpfc_issue_gidpt(vport) > 0)
return 1;
} else {
return 1;
}
} else {
/* Nameserver login in question. Revalidate. */
if (ndlp) {

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

@ -3942,6 +3942,35 @@ lpfc_issue_gidft(struct lpfc_vport *vport)
return vport->gidft_inp;
}
/**
* lpfc_issue_gidpt - issue a GID_PT for all N_Ports
* @vport: The virtual port for which this call is being executed.
*
* This routine will issue a GID_PT to get a list of all N_Ports
*
* Return value :
* 0 - Failure to issue a GID_PT
* 1 - GID_PT issued
**/
int
lpfc_issue_gidpt(struct lpfc_vport *vport)
{
/* Good status, issue CT Request to NameServer */
if (lpfc_ns_cmd(vport, SLI_CTNS_GID_PT, 0, GID_PT_N_PORT)) {
/* Cannot issue NameServer FCP Query, so finish up
* discovery
*/
lpfc_printf_vlog(vport, KERN_ERR, LOG_SLI,
"0606 %s Port TYPE %x %s\n",
"Failed to issue GID_PT to ",
GID_PT_N_PORT,
"Finishing discovery.");
return 0;
}
vport->gidft_inp++;
return 1;
}
/*
* This routine handles processing a NameServer REG_LOGIN mailbox
* command upon completion. It is setup in the LPFC_MBOXQ

1
drivers/scsi/lpfc/lpfc_hw.h
View File

@ -115,6 +115,7 @@ struct lpfc_sli_ct_request {
uint32_t PortID;
struct gid {
uint8_t PortType; /* for GID_PT requests */
#define GID_PT_N_PORT 1
uint8_t DomainScope;
uint8_t AreaScope;
uint8_t Fc4Type; /* for GID_FT requests */

4
drivers/scsi/lpfc/lpfc_hw4.h
View File

@ -197,6 +197,10 @@ struct lpfc_sli_intf {
#define LPFC_FCP_SCHED_ROUND_ROBIN 0
#define LPFC_FCP_SCHED_BY_CPU 1
/* Algrithmns for NameServer Query after RSCN */
#define LPFC_NS_QUERY_GID_FT 0
#define LPFC_NS_QUERY_GID_PT 1
/* Delay Multiplier constant */
#define LPFC_DMULT_CONST 651042
#define LPFC_DMULT_MAX 1023

13
drivers/scsi/lpfc/lpfc_nportdisc.c
View File

@ -1775,9 +1775,16 @@ lpfc_cmpl_reglogin_reglogin_issue(struct lpfc_vport *vport,
ndlp->nlp_fc4_type |= NLP_FC4_FCP;
} else if (ndlp->nlp_fc4_type == 0) {
rc = lpfc_ns_cmd(vport, SLI_CTNS_GFT_ID,
0, ndlp->nlp_DID);
return ndlp->nlp_state;
/* If we are only configured for FCP, the driver
* should just issue PRLI for FCP. Otherwise issue
* GFT_ID to determine if remote port supports NVME.
*/
if (phba->cfg_enable_fc4_type != LPFC_ENABLE_FCP) {
rc = lpfc_ns_cmd(vport, SLI_CTNS_GFT_ID,
0, ndlp->nlp_DID);
return ndlp->nlp_state;
}
ndlp->nlp_fc4_type = NLP_FC4_FCP;
}
ndlp->nlp_prev_state = NLP_STE_REG_LOGIN_ISSUE;