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/*******************************************************************
* This file is part of the Emulex Linux Device Driver for *
* Fibre Channel Host Bus Adapters. *
* Copyright (C) 2017-2022 Broadcom. All Rights Reserved. The term *
* “Broadcom” refers to Broadcom Inc. and/or its subsidiaries. *
* Copyright (C) 2004-2016 Emulex. All rights reserved. *
* EMULEX and SLI are trademarks of Emulex. *
* www.broadcom.com *
* Portions Copyright (C) 2004-2005 Christoph Hellwig *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of version 2 of the GNU General *
* Public License as published by the Free Software Foundation. *
* This program is distributed in the hope that it will be useful. *
* ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND *
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, *
* FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE *
* DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
* TO BE LEGALLY INVALID. See the GNU General Public License for *
* more details, a copy of which can be found in the file COPYING *
* included with this package. *
*******************************************************************/
#include <linux/interrupt.h>
#include <linux/dma-direction.h>
#include <scsi/scsi_transport_fc.h>
#include "lpfc_hw4.h"
#include "lpfc_hw.h"
#include "lpfc_sli.h"
#include "lpfc_sli4.h"
#include "lpfc_nl.h"
#include "lpfc_disc.h"
#include "lpfc.h"
#include "lpfc_crtn.h"
/*
* lpfc_get_vmid_from_hashtable - search the UUID in the hash table
* @vport: The virtual port for which this call is being executed.
* @hash: calculated hash value
* @buf: uuid associated with the VE
* Return the VMID entry associated with the UUID
* Make sure to acquire the appropriate lock before invoking this routine.
*/
struct lpfc_vmid *lpfc_get_vmid_from_hashtable(struct lpfc_vport *vport,
u32 hash, u8 *buf)
{
struct lpfc_vmid *vmp;
hash_for_each_possible(vport->hash_table, vmp, hnode, hash) {
if (memcmp(&vmp->host_vmid[0], buf, 16) == 0)
return vmp;
}
return NULL;
}
/*
* lpfc_put_vmid_in_hashtable - put the VMID in the hash table
* @vport: The virtual port for which this call is being executed.
* @hash - calculated hash value
* @vmp: Pointer to a VMID entry representing a VM sending I/O
*
* This routine will insert the newly acquired VMID entity in the hash table.
* Make sure to acquire the appropriate lock before invoking this routine.
*/
static void
lpfc_put_vmid_in_hashtable(struct lpfc_vport *vport, u32 hash,
struct lpfc_vmid *vmp)
{
hash_add(vport->hash_table, &vmp->hnode, hash);
}
/*
* lpfc_vmid_hash_fn - create a hash value of the UUID
* @vmid: uuid associated with the VE
* @len: length of the VMID string
* Returns the calculated hash value
*/
int lpfc_vmid_hash_fn(const char *vmid, int len)
{
int c;
int hash = 0;
if (len == 0)
return 0;
while (len--) {
c = *vmid++;
if (c >= 'A' && c <= 'Z')
c += 'a' - 'A';
hash = (hash + (c << LPFC_VMID_HASH_SHIFT) +
(c >> LPFC_VMID_HASH_SHIFT)) * 19;
}
return hash & LPFC_VMID_HASH_MASK;
}
/*
* lpfc_vmid_update_entry - update the vmid entry in the hash table
* @vport: The virtual port for which this call is being executed.
* @iodir: io direction
* @vmp: Pointer to a VMID entry representing a VM sending I/O
* @tag: VMID tag
*/
static void lpfc_vmid_update_entry(struct lpfc_vport *vport,
enum dma_data_direction iodir,
struct lpfc_vmid *vmp,
union lpfc_vmid_io_tag *tag)
{
u64 *lta;
if (vport->phba->pport->vmid_flag & LPFC_VMID_TYPE_PRIO)
tag->cs_ctl_vmid = vmp->un.cs_ctl_vmid;
else if (vport->phba->cfg_vmid_app_header)
tag->app_id = vmp->un.app_id;
if (iodir == DMA_TO_DEVICE)
vmp->io_wr_cnt++;
else if (iodir == DMA_FROM_DEVICE)
vmp->io_rd_cnt++;
/* update the last access timestamp in the table */
lta = per_cpu_ptr(vmp->last_io_time, raw_smp_processor_id());
*lta = jiffies;
}
static void lpfc_vmid_assign_cs_ctl(struct lpfc_vport *vport,
struct lpfc_vmid *vmid)
{
u32 hash;
struct lpfc_vmid *pvmid;
if (vport->port_type == LPFC_PHYSICAL_PORT) {
vmid->un.cs_ctl_vmid = lpfc_vmid_get_cs_ctl(vport);
} else {
hash = lpfc_vmid_hash_fn(vmid->host_vmid, vmid->vmid_len);
pvmid =
lpfc_get_vmid_from_hashtable(vport->phba->pport, hash,
vmid->host_vmid);
if (pvmid)
vmid->un.cs_ctl_vmid = pvmid->un.cs_ctl_vmid;
else
vmid->un.cs_ctl_vmid = lpfc_vmid_get_cs_ctl(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
* @iodir: io direction
* @tag: VMID tag
* Returns status of the function
*/
int lpfc_vmid_get_appid(struct lpfc_vport *vport, char *uuid,
enum dma_data_direction iodir,
union lpfc_vmid_io_tag *tag)
{
struct lpfc_vmid *vmp = NULL;
int hash, len, rc = -EPERM, i;
/* check if QFPA is complete */
if (lpfc_vmid_is_type_priority_tag(vport) &&
!(vport->vmid_flag & LPFC_VMID_QFPA_CMPL) &&
(vport->vmid_flag & LPFC_VMID_ISSUE_QFPA)) {
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, iodir, 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, iodir, 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 (vport->phba->pport->vmid_flag & LPFC_VMID_TYPE_PRIO)
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_gfp(u64, GFP_ATOMIC);
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 (vport->phba->pport->vmid_flag & LPFC_VMID_TYPE_PRIO)
rc = lpfc_vmid_uvem(vport, vmp, true);
else if (vport->phba->cfg_vmid_app_header)
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;
}
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