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scsi: lpfc: vmid: Introduce VMID in I/O path

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Introduce the VMID in the I/O path. Check if the VMID is enabled and if
the I/O belongs to a VM or not.

Link: https://lore.kernel.org/r/20210608043556.274139-14-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 10:05:56 +05:30 committed by Martin K. Petersen
parent 0c4792c64f
commit 33c79741de
1 changed files with 174 additions and 0 deletions
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174
drivers/scsi/lpfc/lpfc_scsi.c
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@ -5278,6 +5278,160 @@ static void lpfc_vmid_assign_cs_ctl(struct lpfc_vport *vport,
}
}
/*
* lpfc_vmid_get_appid - get the VMID associated with the UUID
* @vport: The virtual port for which this call is being executed.
* @uuid: UUID associated with the VE
* @cmd: address of scsi_cmd descriptor
* @tag: VMID tag
* Returns status of the function
*/
static int lpfc_vmid_get_appid(struct lpfc_vport *vport, char *uuid, struct
scsi_cmnd * cmd, union lpfc_vmid_io_tag *tag)
{
struct lpfc_vmid *vmp = NULL;
int hash, len, rc, i;
/* check if QFPA is complete */
if (lpfc_vmid_is_type_priority_tag(vport) && !(vport->vmid_flag &
LPFC_VMID_QFPA_CMPL)) {
vport->work_port_events |= WORKER_CHECK_VMID_ISSUE_QFPA;
return -EAGAIN;
}
/* search if the UUID has already been mapped to the VMID */
len = strlen(uuid);
hash = lpfc_vmid_hash_fn(uuid, len);
/* search for the VMID in the table */
read_lock(&vport->vmid_lock);
vmp = lpfc_get_vmid_from_hashtable(vport, hash, uuid);
/* if found, check if its already registered */
if (vmp && vmp->flag & LPFC_VMID_REGISTERED) {
read_unlock(&vport->vmid_lock);
lpfc_vmid_update_entry(vport, cmd, vmp, tag);
rc = 0;
} else if (vmp && (vmp->flag & LPFC_VMID_REQ_REGISTER ||
vmp->flag & LPFC_VMID_DE_REGISTER)) {
/* else if register or dereg request has already been sent */
/* Hence VMID tag will not be added for this I/O */
read_unlock(&vport->vmid_lock);
rc = -EBUSY;
} else {
/* The VMID was not found in the hashtable. At this point, */
/* drop the read lock first before proceeding further */
read_unlock(&vport->vmid_lock);
/* start the process to obtain one as per the */
/* type of the VMID indicated */
write_lock(&vport->vmid_lock);
vmp = lpfc_get_vmid_from_hashtable(vport, hash, uuid);
/* while the read lock was released, in case the entry was */
/* added by other context or is in process of being added */
if (vmp && vmp->flag & LPFC_VMID_REGISTERED) {
lpfc_vmid_update_entry(vport, cmd, vmp, tag);
write_unlock(&vport->vmid_lock);
return 0;
} else if (vmp && vmp->flag & LPFC_VMID_REQ_REGISTER) {
write_unlock(&vport->vmid_lock);
return -EBUSY;
}
/* else search and allocate a free slot in the hash table */
if (vport->cur_vmid_cnt < vport->max_vmid) {
for (i = 0; i < vport->max_vmid; i++) {
vmp = vport->vmid + i;
if (vmp->flag == LPFC_VMID_SLOT_FREE)
break;
}
if (i == vport->max_vmid)
vmp = NULL;
} else {
vmp = NULL;
}
if (!vmp) {
write_unlock(&vport->vmid_lock);
return -ENOMEM;
}
/* Add the vmid and register */
lpfc_put_vmid_in_hashtable(vport, hash, vmp);
vmp->vmid_len = len;
memcpy(vmp->host_vmid, uuid, vmp->vmid_len);
vmp->io_rd_cnt = 0;
vmp->io_wr_cnt = 0;
vmp->flag = LPFC_VMID_SLOT_USED;
vmp->delete_inactive =
vport->vmid_inactivity_timeout ? 1 : 0;
/* if type priority tag, get next available VMID */
if (lpfc_vmid_is_type_priority_tag(vport))
lpfc_vmid_assign_cs_ctl(vport, vmp);
/* allocate the per cpu variable for holding */
/* the last access time stamp only if VMID is enabled */
if (!vmp->last_io_time)
vmp->last_io_time = __alloc_percpu(sizeof(u64),
__alignof__(struct
lpfc_vmid));
if (!vmp->last_io_time) {
hash_del(&vmp->hnode);
vmp->flag = LPFC_VMID_SLOT_FREE;
write_unlock(&vport->vmid_lock);
return -EIO;
}
write_unlock(&vport->vmid_lock);
/* complete transaction with switch */
if (lpfc_vmid_is_type_priority_tag(vport))
rc = lpfc_vmid_uvem(vport, vmp, true);
else
rc = lpfc_vmid_cmd(vport, SLI_CTAS_RAPP_IDENT, vmp);
if (!rc) {
write_lock(&vport->vmid_lock);
vport->cur_vmid_cnt++;
vmp->flag |= LPFC_VMID_REQ_REGISTER;
write_unlock(&vport->vmid_lock);
} else {
write_lock(&vport->vmid_lock);
hash_del(&vmp->hnode);
vmp->flag = LPFC_VMID_SLOT_FREE;
free_percpu(vmp->last_io_time);
write_unlock(&vport->vmid_lock);
return -EIO;
}
/* finally, enable the idle timer once */
if (!(vport->phba->pport->vmid_flag & LPFC_VMID_TIMER_ENBLD)) {
mod_timer(&vport->phba->inactive_vmid_poll,
jiffies +
msecs_to_jiffies(1000 * LPFC_VMID_TIMER));
vport->phba->pport->vmid_flag |= LPFC_VMID_TIMER_ENBLD;
}
}
return rc;
}
/*
* lpfc_is_command_vm_io - get the UUID from blk cgroup
* @cmd: Pointer to scsi_cmnd data structure
* Returns UUID if present, otherwise NULL
*/
static char *lpfc_is_command_vm_io(struct scsi_cmnd *cmd)
{
char *uuid = NULL;
if (cmd->request) {
if (cmd->request->bio)
uuid = blkcg_get_fc_appid(cmd->request->bio);
}
return uuid;
}
/**
* lpfc_queuecommand - scsi_host_template queuecommand entry point
* @shost: kernel scsi host pointer.
@ -5303,6 +5457,7 @@ lpfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
int err, idx;
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
uint64_t start = 0L;
u8 *uuid = NULL;
if (phba->ktime_on)
start = ktime_get_ns();
@ -5430,6 +5585,25 @@ lpfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
}
/* check the necessary and sufficient condition to support VMID */
if (lpfc_is_vmid_enabled(phba) &&
(ndlp->vmid_support ||
phba->pport->vmid_priority_tagging ==
LPFC_VMID_PRIO_TAG_ALL_TARGETS)) {
/* is the I/O generated by a VM, get the associated virtual */
/* entity id */
uuid = lpfc_is_command_vm_io(cmnd);
if (uuid) {
err = lpfc_vmid_get_appid(vport, uuid, cmnd,
(union lpfc_vmid_io_tag *)
&lpfc_cmd->cur_iocbq.vmid_tag);
if (!err)
lpfc_cmd->cur_iocbq.iocb_flag |= LPFC_IO_VMID;
}
}
atomic_inc(&ndlp->cmd_pending);
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
if (unlikely(phba->hdwqstat_on & LPFC_CHECK_SCSI_IO))
this_cpu_inc(phba->sli4_hba.c_stat->xmt_io);