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scsi: lpfc: vmid: Timeout implementation for VMID

Browse source 
Implement timeout functionality for the VMID. After the set time period of
inactivity, the VMID is deregistered from the switch.

Link: https://lore.kernel.org/r/20210608043556.274139-12-muneendra.kumar@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Gaurav Srivastava <gaurav.srivastava@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Muneendra Kumar <muneendra.kumar@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Gaurav Srivastava 2021-06-08 10:05:54 +05:30 committed by Martin K. Petersen
parent f56e86a082
commit 20397179aa
2 changed files with 145 additions and 0 deletions
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105
drivers/scsi/lpfc/lpfc_hbadisc.c
View file

@ -72,6 +72,7 @@ static void lpfc_disc_flush_list(struct lpfc_vport *vport);
static void lpfc_unregister_fcfi_cmpl(struct lpfc_hba *, LPFC_MBOXQ_t *);
static int lpfc_fcf_inuse(struct lpfc_hba *);
static void lpfc_mbx_cmpl_read_sparam(struct lpfc_hba *, LPFC_MBOXQ_t *);
static void lpfc_check_inactive_vmid(struct lpfc_hba *phba);
static int
lpfc_valid_xpt_node(struct lpfc_nodelist *ndlp)
@ -234,6 +235,110 @@ lpfc_dev_loss_tmo_callbk(struct fc_rport *rport)
return;
}
/**
* lpfc_check_inactive_vmid_one - VMID inactivity checker for a vport
* @vport: Pointer to vport context object.
*
* This function checks for idle VMID entries related to a particular vport. If
* found unused/idle, free them accordingly.
**/
static void lpfc_check_inactive_vmid_one(struct lpfc_vport *vport)
{
u16 keep;
u32 difftime = 0, r, bucket;
u64 *lta;
int cpu;
struct lpfc_vmid *vmp;
write_lock(&vport->vmid_lock);
if (!vport->cur_vmid_cnt)
goto out;
/* iterate through the table */
hash_for_each(vport->hash_table, bucket, vmp, hnode) {
keep = 0;
if (vmp->flag & LPFC_VMID_REGISTERED) {
/* check if the particular VMID is in use */
/* for all available per cpu variable */
for_each_possible_cpu(cpu) {
/* if last access time is less than timeout */
lta = per_cpu_ptr(vmp->last_io_time, cpu);
if (!lta)
continue;
difftime = (jiffies) - (*lta);
if ((vport->vmid_inactivity_timeout *
JIFFIES_PER_HR) > difftime) {
keep = 1;
break;
}
}
/* if none of the cpus have been used by the vm, */
/* remove the entry if already registered */
if (!keep) {
/* mark the entry for deregistration */
vmp->flag = LPFC_VMID_DE_REGISTER;
write_unlock(&vport->vmid_lock);
if (vport->vmid_priority_tagging)
r = lpfc_vmid_uvem(vport, vmp, false);
else
r = lpfc_vmid_cmd(vport,
SLI_CTAS_DAPP_IDENT,
vmp);
/* decrement number of active vms and mark */
/* entry in slot as free */
write_lock(&vport->vmid_lock);
if (!r) {
struct lpfc_vmid *ht = vmp;
vport->cur_vmid_cnt--;
ht->flag = LPFC_VMID_SLOT_FREE;
free_percpu(ht->last_io_time);
ht->last_io_time = NULL;
hash_del(&ht->hnode);
}
}
}
}
out:
write_unlock(&vport->vmid_lock);
}
/**
* lpfc_check_inactive_vmid - VMID inactivity checker
* @phba: Pointer to hba context object.
*
* This function is called from the worker thread to determine if an entry in
* the VMID table can be released since there was no I/O activity seen from that
* particular VM for the specified time. When this happens, the entry in the
* table is released and also the resources on the switch cleared.
**/
static void lpfc_check_inactive_vmid(struct lpfc_hba *phba)
{
struct lpfc_vport *vport;
struct lpfc_vport **vports;
int i;
vports = lpfc_create_vport_work_array(phba);
if (!vports)
return;
for (i = 0; i <= phba->max_vports; i++) {
if ((!vports[i]) && (i == 0))
vport = phba->pport;
else
vport = vports[i];
if (!vport)
break;
lpfc_check_inactive_vmid_one(vport);
}
lpfc_destroy_vport_work_array(phba, vports);
}
/**
* lpfc_dev_loss_tmo_handler - Remote node devloss timeout handler
* @ndlp: Pointer to remote node object.

40
drivers/scsi/lpfc/lpfc_init.c
View file

@ -4843,6 +4843,42 @@ lpfc_sli4_fcf_redisc_wait_tmo(struct timer_list *t)
lpfc_worker_wake_up(phba);
}
/**
* lpfc_vmid_poll - VMID timeout detection
* @ptr: Map to lpfc_hba data structure pointer.
*
* This routine is invoked when there is no I/O on by a VM for the specified
* amount of time. When this situation is detected, the VMID has to be
* deregistered from the switch and all the local resources freed. The VMID
* will be reassigned to the VM once the I/O begins.
**/
static void
lpfc_vmid_poll(struct timer_list *t)
{
struct lpfc_hba *phba = from_timer(phba, t, inactive_vmid_poll);
u32 wake_up = 0;
/* check if there is a need to issue QFPA */
if (phba->pport->vmid_priority_tagging) {
wake_up = 1;
phba->pport->work_port_events |= WORKER_CHECK_VMID_ISSUE_QFPA;
}
/* Is the vmid inactivity timer enabled */
if (phba->pport->vmid_inactivity_timeout ||
phba->pport->load_flag & FC_DEREGISTER_ALL_APP_ID) {
wake_up = 1;
phba->pport->work_port_events |= WORKER_CHECK_INACTIVE_VMID;
}
if (wake_up)
lpfc_worker_wake_up(phba);
/* restart the timer for the next iteration */
mod_timer(&phba->inactive_vmid_poll, jiffies + msecs_to_jiffies(1000 *
LPFC_VMID_TIMER));
}
/**
* lpfc_sli4_parse_latt_fault - Parse sli4 link-attention link fault code
* @phba: pointer to lpfc hba data structure.
@ -6691,6 +6727,10 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
phba->hbqs[LPFC_ELS_HBQ].hbq_alloc_buffer = lpfc_sli4_rb_alloc;
phba->hbqs[LPFC_ELS_HBQ].hbq_free_buffer = lpfc_sli4_rb_free;
/* for VMID idle timeout if VMID is enabled */
if (lpfc_is_vmid_enabled(phba))
timer_setup(&phba->inactive_vmid_poll, lpfc_vmid_poll, 0);
/*
* Initialize the SLI Layer to run with lpfc SLI4 HBAs.
*/