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