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[SCSI] lpfc 8.3.11: FCF failover improvements

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FCF failover improvements

- Add random FCF failover when there are multiple FCFs available.
- Prevent FCF log messages from being displayed for FC adapters.
- Separate the New FCF and Modified FCF log messages.

Signed-off-by: Alex Iannicelli <alex.iannicelli@emulex.com>
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
James Smart 2010-03-15 11:24:56 -04:00 committed by James Bottomley
parent 65c054f235
commit 999d813f22
5 changed files with 77 additions and 13 deletions
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13
drivers/scsi/lpfc/lpfc_els.c
View File

@ -893,11 +893,14 @@ lpfc_cmpl_els_flogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
if (!rc) {
/* Mark the FCF discovery process done */
lpfc_printf_vlog(vport, KERN_INFO, LOG_FIP | LOG_ELS,
"2769 FLOGI successful on FCF record: "
"current_fcf_index:x%x, terminate FCF "
"round robin failover process\n",
phba->fcf.current_rec.fcf_indx);
if (phba->hba_flag & HBA_FIP_SUPPORT)
lpfc_printf_vlog(vport, KERN_INFO, LOG_FIP |
LOG_ELS,
"2769 FLOGI successful on FCF "
"record: current_fcf_index:"
"x%x, terminate FCF round "
"robin failover process\n",
phba->fcf.current_rec.fcf_indx);
spin_lock_irq(&phba->hbalock);
phba->fcf.fcf_flag &= ~FCF_DISCOVERY;
spin_unlock_irq(&phba->hbalock);

53
drivers/scsi/lpfc/lpfc_hbadisc.c
View File

@ -1531,7 +1531,37 @@ lpfc_check_pending_fcoe_event(struct lpfc_hba *phba, uint8_t unreg_fcf)
}
/**
* lpfc_sli4_fcf_rec_mbox_parse - parse non-embedded fcf record mailbox command
* lpfc_sli4_new_fcf_random_select - Randomly select an eligible new fcf record
* @phba: pointer to lpfc hba data structure.
* @fcf_cnt: number of eligible fcf record seen so far.
*
* This function makes an running random selection decision on FCF record to
* use through a sequence of @fcf_cnt eligible FCF records with equal
* probability. To perform integer manunipulation of random numbers with
* size unit32_t, the lower 16 bits of the 32-bit random number returned
* from random32() are taken as the random random number generated.
*
* Returns true when outcome is for the newly read FCF record should be
* chosen; otherwise, return false when outcome is for keeping the previously
* chosen FCF record.
**/
static bool
lpfc_sli4_new_fcf_random_select(struct lpfc_hba *phba, uint32_t fcf_cnt)
{
uint32_t rand_num;
/* Get 16-bit uniform random number */
rand_num = (0xFFFF & random32());
/* Decision with probability 1/fcf_cnt */
if ((fcf_cnt * rand_num) < 0xFFFF)
return true;
else
return false;
}
/**
* lpfc_mbx_cmpl_read_fcf_record - Completion handler for read_fcf mbox.
* @phba: pointer to lpfc hba data structure.
* @mboxq: pointer to mailbox object.
* @next_fcf_index: pointer to holder of next fcf index.
@ -1679,6 +1709,8 @@ lpfc_mbx_cmpl_fcf_scan_read_fcf_rec(struct lpfc_hba *phba, LPFC_MBOXQ_t *mboxq)
uint16_t fcf_index, next_fcf_index;
struct lpfc_fcf_rec *fcf_rec = NULL;
uint16_t vlan_id;
uint32_t seed;
bool select_new_fcf;
int rc;
/* If there is pending FCoE event restart FCF table scan */
@ -1809,9 +1841,21 @@ lpfc_mbx_cmpl_fcf_scan_read_fcf_rec(struct lpfc_hba *phba, LPFC_MBOXQ_t *mboxq)
* than the driver FCF record, use the new record.
*/
if (new_fcf_record->fip_priority < fcf_rec->priority) {
/* Choose this FCF record */
/* Choose the new FCF record with lower priority */
__lpfc_update_fcf_record(phba, fcf_rec, new_fcf_record,
addr_mode, vlan_id, 0);
/* Reset running random FCF selection count */
phba->fcf.eligible_fcf_cnt = 1;
} else if (new_fcf_record->fip_priority == fcf_rec->priority) {
/* Update running random FCF selection count */
phba->fcf.eligible_fcf_cnt++;
select_new_fcf = lpfc_sli4_new_fcf_random_select(phba,
phba->fcf.eligible_fcf_cnt);
if (select_new_fcf)
/* Choose the new FCF by random selection */
__lpfc_update_fcf_record(phba, fcf_rec,
new_fcf_record,
addr_mode, vlan_id, 0);
}
spin_unlock_irq(&phba->hbalock);
goto read_next_fcf;
@ -1825,6 +1869,11 @@ lpfc_mbx_cmpl_fcf_scan_read_fcf_rec(struct lpfc_hba *phba, LPFC_MBOXQ_t *mboxq)
addr_mode, vlan_id, (boot_flag ?
BOOT_ENABLE : 0));
phba->fcf.fcf_flag |= FCF_AVAILABLE;
/* Setup initial running random FCF selection count */
phba->fcf.eligible_fcf_cnt = 1;
/* Seeding the random number generator for random selection */
seed = (uint32_t)(0xFFFFFFFF & jiffies);
srandom32(seed);
}
spin_unlock_irq(&phba->hbalock);
goto read_next_fcf;

19
drivers/scsi/lpfc/lpfc_init.c
View File

@ -3304,11 +3304,20 @@ lpfc_sli4_async_fcoe_evt(struct lpfc_hba *phba,
switch (event_type) {
case LPFC_FCOE_EVENT_TYPE_NEW_FCF:
case LPFC_FCOE_EVENT_TYPE_FCF_PARAM_MOD:
lpfc_printf_log(phba, KERN_ERR, LOG_FIP | LOG_DISCOVERY,
"2546 New FCF found/FCF parameter modified event: "
"evt_tag:x%x, fcf_index:x%x\n",
acqe_fcoe->event_tag, acqe_fcoe->index);
if (event_type == LPFC_FCOE_EVENT_TYPE_NEW_FCF)
lpfc_printf_log(phba, KERN_ERR, LOG_FIP |
LOG_DISCOVERY,
"2546 New FCF found event: "
"evt_tag:x%x, fcf_index:x%x\n",
acqe_fcoe->event_tag,
acqe_fcoe->index);
else
lpfc_printf_log(phba, KERN_WARNING, LOG_FIP |
LOG_DISCOVERY,
"2788 FCF parameter modified event: "
"evt_tag:x%x, fcf_index:x%x\n",
acqe_fcoe->event_tag,
acqe_fcoe->index);
spin_lock_irq(&phba->hbalock);
if ((phba->fcf.fcf_flag & FCF_SCAN_DONE) ||
(phba->hba_flag & FCF_DISC_INPROGRESS)) {

4
drivers/scsi/lpfc/lpfc_sli.c
View File

@ -12040,9 +12040,11 @@ lpfc_sli4_fcf_scan_read_fcf_rec(struct lpfc_hba *phba, uint16_t fcf_index)
phba->hba_flag |= FCF_DISC_INPROGRESS;
spin_unlock_irq(&phba->hbalock);
/* Reset FCF round robin index bmask for new scan */
if (fcf_index == LPFC_FCOE_FCF_GET_FIRST)
if (fcf_index == LPFC_FCOE_FCF_GET_FIRST) {
memset(phba->fcf.fcf_rr_bmask, 0,
sizeof(*phba->fcf.fcf_rr_bmask));
phba->fcf.eligible_fcf_cnt = 0;
}
error = 0;
}
fail_fcf_scan:

1
drivers/scsi/lpfc/lpfc_sli4.h
View File

@ -162,6 +162,7 @@ struct lpfc_fcf {
#define FCF_REDISC_FOV 0x200 /* Post FCF rediscovery fast failover */
uint32_t addr_mode;
uint16_t fcf_rr_init_indx;
uint32_t eligible_fcf_cnt;
struct lpfc_fcf_rec current_rec;
struct lpfc_fcf_rec failover_rec;
struct timer_list redisc_wait;