----- Original Message -----
> From: jsmart2021@xxxxxxxxx
> To: linux-scsi@xxxxxxxxxxxxxxx, linux-nvme@xxxxxxxxxxxxxxxxxxx
> Cc: "James Smart" <jsmart2021@xxxxxxxxx>, "Dick Kennedy" <dick.kennedy@xxxxxxxxxxxx>, "James Smart"
> <james.smart@xxxxxxxxxxxx>
> Sent: Saturday, March 4, 2017 12:30:31 PM
> Subject: [PATCH 11/20] lpfc: Fix eh_deadline setting for sli3 adapters.
>
> From: James Smart <jsmart2021@xxxxxxxxx>
>
> A previous change unilaterally removed the hba reset entry point
> from the sli3 host template. This was done to allow tape devices
> being used for back up from being removed. Why was this done ?
> When there was non-responding device on the fabric, the error
> escalation policy would escalate to the reset handler. When the
> reset handler was called, it would reset the adapter, dropping
> link, thus logging out and terminating all i/o's - on any target.
> If there was a tape device on the same adapter that wasn't in
> error, it would kill the tape i/o's, effectively killing the
> tape device state. With the reset point removed, the adapter
> reset avoided the fabric logout, allowing the other devices to
> continue to operate unaffected. A hack - yes. Hint: we really
> need a transport I_T nexus reset callback added to the eh process
> (in between the SCSI target reset and hba reset points), so a
> fc logout could occur to the one bad target only and stop the error
> escalation process.
>
> This patch commonizes the approach so it can be used for sli3 and sli4
> adapters, but mandates the admin, via module parameter, specifically
> identify which adapters the resets are to be removed for. Additionally,
> bus_reset, which sends Target Reset TMFs to all targets, is also removed
> from the template as it too has the same effect as the adapter reset.
>
> Signed-off-by: Dick Kennedy <dick.kennedy@xxxxxxxxxxxx>
> Signed-off-by: James Smart <james.smart@xxxxxxxxxxxx>
> ---
> drivers/scsi/lpfc/lpfc.h | 1 +
> drivers/scsi/lpfc/lpfc_attr.c | 6 +++++
> drivers/scsi/lpfc/lpfc_crtn.h | 4 ++-
> drivers/scsi/lpfc/lpfc_init.c | 61
> ++++++++++++++++++++++++++++++++++++++++---
> drivers/scsi/lpfc/lpfc_scsi.c | 3 +--
> 5 files changed, 69 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
> index de6cd57..763f32d 100644
> --- a/drivers/scsi/lpfc/lpfc.h
> +++ b/drivers/scsi/lpfc/lpfc.h
> @@ -99,6 +99,7 @@ struct lpfc_sli2_slim;
> #define FC_MAX_ADPTMSG 64
>
> #define MAX_HBAEVT 32
> +#define MAX_HBAS_NO_RESET 16
>
> /* Number of MSI-X vectors the driver uses */
> #define LPFC_MSIX_VECTORS 2
> diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
> index 4114cf4..b741dcb 100644
> --- a/drivers/scsi/lpfc/lpfc_attr.c
> +++ b/drivers/scsi/lpfc/lpfc_attr.c
> @@ -3010,6 +3010,12 @@ MODULE_PARM_DESC(lpfc_poll, "FCP ring polling mode
> control:"
> static DEVICE_ATTR(lpfc_poll, S_IRUGO | S_IWUSR,
> lpfc_poll_show, lpfc_poll_store);
>
> +int lpfc_no_hba_reset_cnt;
> +unsigned long lpfc_no_hba_reset[MAX_HBAS_NO_RESET] = {
> + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
> +module_param_array(lpfc_no_hba_reset, ulong, &lpfc_no_hba_reset_cnt, 0444);
> +MODULE_PARM_DESC(lpfc_no_hba_reset, "WWPN of HBAs that should not be
> reset");
> +
> LPFC_ATTR(sli_mode, 0, 0, 3,
> "SLI mode selector:"
> " 0 - auto (SLI-3 if supported),"
> diff --git a/drivers/scsi/lpfc/lpfc_crtn.h b/drivers/scsi/lpfc/lpfc_crtn.h
> index 843dd73..54e6ac4 100644
> --- a/drivers/scsi/lpfc/lpfc_crtn.h
> +++ b/drivers/scsi/lpfc/lpfc_crtn.h
> @@ -384,7 +384,7 @@ void lpfc_free_sysfs_attr(struct lpfc_vport *);
> extern struct device_attribute *lpfc_hba_attrs[];
> extern struct device_attribute *lpfc_vport_attrs[];
> extern struct scsi_host_template lpfc_template;
> -extern struct scsi_host_template lpfc_template_s3;
> +extern struct scsi_host_template lpfc_template_no_hr;
> extern struct scsi_host_template lpfc_template_nvme;
> extern struct scsi_host_template lpfc_vport_template;
> extern struct fc_function_template lpfc_transport_functions;
> @@ -554,3 +554,5 @@ void lpfc_nvme_abort_fcreq_cmpl(struct lpfc_hba *phba,
> struct lpfc_wcqe_complete *abts_cmpl);
> extern int lpfc_enable_nvmet_cnt;
> extern unsigned long long lpfc_enable_nvmet[];
> +extern int lpfc_no_hba_reset_cnt;
> +extern unsigned long lpfc_no_hba_reset[];
> diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
> index b754887..ecb8e1c 100644
> --- a/drivers/scsi/lpfc/lpfc_init.c
> +++ b/drivers/scsi/lpfc/lpfc_init.c
> @@ -3555,6 +3555,44 @@ lpfc_sli4_scsi_sgl_update(struct lpfc_hba *phba)
> return rc;
> }
>
> +static uint64_t
> +lpfc_get_wwpn(struct lpfc_hba *phba)
> +{
> + uint64_t wwn;
> + int rc;
> + LPFC_MBOXQ_t *mboxq;
> + MAILBOX_t *mb;
> +
> +
> + mboxq = (LPFC_MBOXQ_t *) mempool_alloc(phba->mbox_mem_pool,
> + GFP_KERNEL);
> + if (!mboxq)
> + return (uint64_t)-1;
> +
> + /* First get WWN of HBA instance */
> + lpfc_read_nv(phba, mboxq);
> + rc = lpfc_sli_issue_mbox(phba, mboxq, MBX_POLL);
> + if (rc != MBX_SUCCESS) {
> + lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
> + "6019 Mailbox failed , mbxCmd x%x "
> + "READ_NV, mbxStatus x%x\n",
> + bf_get(lpfc_mqe_command, &mboxq->u.mqe),
> + bf_get(lpfc_mqe_status, &mboxq->u.mqe));
> + mempool_free(mboxq, phba->mbox_mem_pool);
> + return (uint64_t) -1;
> + }
> + mb = &mboxq->u.mb;
> + memcpy(&wwn, (char *)mb->un.varRDnvp.portname, sizeof(uint64_t));
> + /* wwn is WWPN of HBA instance */
> + mempool_free(mboxq, phba->mbox_mem_pool);
> + if (phba->sli_rev == LPFC_SLI_REV4)
> + return be64_to_cpu(wwn);
> + else
> + return (((wwn & 0xffffffff00000000) >> 32) |
> + ((wwn & 0x00000000ffffffff) << 32));
> +
> +}
> +
> /**
> * lpfc_sli4_nvme_sgl_update - update xri-sgl sizing and mapping
> * @phba: pointer to lpfc hba data structure.
> @@ -3676,17 +3714,32 @@ lpfc_create_port(struct lpfc_hba *phba, int instance,
> struct device *dev)
> struct lpfc_vport *vport;
> struct Scsi_Host *shost = NULL;
> int error = 0;
> + int i;
> + uint64_t wwn;
> + bool use_no_reset_hba = false;
> +
> + wwn = lpfc_get_wwpn(phba);
> +
> + for (i = 0; i < lpfc_no_hba_reset_cnt; i++) {
> + if (wwn == lpfc_no_hba_reset[i]) {
> + lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
> + "6020 Setting use_no_reset port=%llx\n",
> + wwn);
> + use_no_reset_hba = true;
> + break;
> + }
> + }
>
> if (phba->cfg_enable_fc4_type & LPFC_ENABLE_FCP) {
> if (dev != &phba->pcidev->dev) {
> shost = scsi_host_alloc(&lpfc_vport_template,
> sizeof(struct lpfc_vport));
> } else {
> - if (phba->sli_rev == LPFC_SLI_REV4)
> + if (!use_no_reset_hba)
> shost = scsi_host_alloc(&lpfc_template,
> sizeof(struct lpfc_vport));
> else
> - shost = scsi_host_alloc(&lpfc_template_s3,
> + shost = scsi_host_alloc(&lpfc_template_no_hr,
> sizeof(struct lpfc_vport));
> }
> } else if (phba->cfg_enable_fc4_type & LPFC_ENABLE_NVME) {
> @@ -5482,7 +5535,8 @@ lpfc_sli_driver_resource_setup(struct lpfc_hba *phba)
>
> /* Initialize the host templates the configured values. */
> lpfc_vport_template.sg_tablesize = phba->cfg_sg_seg_cnt;
> - lpfc_template_s3.sg_tablesize = phba->cfg_sg_seg_cnt;
> + lpfc_template_no_hr.sg_tablesize = phba->cfg_sg_seg_cnt;
> + lpfc_template.sg_tablesize = phba->cfg_sg_seg_cnt;
>
> /* There are going to be 2 reserved BDEs: 1 FCP cmnd + 1 FCP rsp */
> if (phba->cfg_enable_bg) {
> @@ -5706,6 +5760,7 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
> /* Initialize the host templates with the updated values. */
> lpfc_vport_template.sg_tablesize = phba->cfg_sg_seg_cnt;
> lpfc_template.sg_tablesize = phba->cfg_sg_seg_cnt;
> + lpfc_template_no_hr.sg_tablesize = phba->cfg_sg_seg_cnt;
>
> if (phba->cfg_sg_dma_buf_size <= LPFC_MIN_SG_SLI4_BUF_SZ)
> phba->cfg_sg_dma_buf_size = LPFC_MIN_SG_SLI4_BUF_SZ;
> diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
> index 9d6384a..bcfd6d6 100644
> --- a/drivers/scsi/lpfc/lpfc_scsi.c
> +++ b/drivers/scsi/lpfc/lpfc_scsi.c
> @@ -5953,7 +5953,7 @@ struct scsi_host_template lpfc_template_nvme = {
> .track_queue_depth = 0,
> };
>
> -struct scsi_host_template lpfc_template_s3 = {
> +struct scsi_host_template lpfc_template_no_hr = {
> .module = THIS_MODULE,
> .name = LPFC_DRIVER_NAME,
> .proc_name = LPFC_DRIVER_NAME,
> @@ -6015,7 +6015,6 @@ struct scsi_host_template lpfc_vport_template = {
> .eh_abort_handler = lpfc_abort_handler,
> .eh_device_reset_handler = lpfc_device_reset_handler,
> .eh_target_reset_handler = lpfc_target_reset_handler,
> - .eh_bus_reset_handler = lpfc_bus_reset_handler,
> .slave_alloc = lpfc_slave_alloc,
> .slave_configure = lpfc_slave_configure,
> .slave_destroy = lpfc_slave_destroy,
> --
> 2.5.0
>
>
This patch was implemented and tested in the Red Hat lab and validated for a customer requiring eh_deadline.
Reviewed-by: Laurence Oberman <loberman@xxxxxxxxxx>
Tested-by: Laurence Oberman <loberman@xxxxxxxxxx>
