[SCSI] lpfc 8.3.45: Incorporated support of a low-latency io path
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 0b08188..4015fcc 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -68,6 +68,17 @@
__be32 ref_tag; /* Target LBA or indirect LBA */
};
+static struct lpfc_rport_data *
+lpfc_rport_data_from_scsi_device(struct scsi_device *sdev)
+{
+ struct lpfc_vport *vport = (struct lpfc_vport *)sdev->host->hostdata;
+
+ if (vport->phba->cfg_EnableXLane)
+ return ((struct lpfc_device_data *)sdev->hostdata)->rport_data;
+ else
+ return (struct lpfc_rport_data *)sdev->hostdata;
+}
+
static void
lpfc_release_scsi_buf_s4(struct lpfc_hba *phba, struct lpfc_scsi_buf *psb);
static void
@@ -306,7 +317,7 @@
old_queue_depth = sdev->queue_depth;
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
new_queue_depth = sdev->queue_depth;
- rdata = sdev->hostdata;
+ rdata = lpfc_rport_data_from_scsi_device(sdev);
if (rdata)
lpfc_send_sdev_queuedepth_change_event(phba, vport,
rdata->pnode, sdev->lun,
@@ -1502,7 +1513,7 @@
}
/* Next check if we need to match the remote NPortID or WWPN */
- rdata = sc->device->hostdata;
+ rdata = lpfc_rport_data_from_scsi_device(sc->device);
if (rdata && rdata->pnode) {
ndlp = rdata->pnode;
@@ -3507,6 +3518,14 @@
* we need to set word 4 of IOCB here
*/
iocb_cmd->un.fcpi.fcpi_parm = scsi_bufflen(scsi_cmnd);
+
+ /*
+ * If the OAS driver feature is enabled and the lun is enabled for
+ * OAS, set the oas iocb related flags.
+ */
+ if ((phba->cfg_EnableXLane) && ((struct lpfc_device_data *)
+ scsi_cmnd->device->hostdata)->oas_enabled)
+ lpfc_cmd->cur_iocbq.iocb_flag |= LPFC_IO_OAS;
return 0;
}
@@ -4691,12 +4710,13 @@
{
struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
struct lpfc_hba *phba = vport->phba;
- struct lpfc_rport_data *rdata = cmnd->device->hostdata;
+ struct lpfc_rport_data *rdata;
struct lpfc_nodelist *ndlp;
struct lpfc_scsi_buf *lpfc_cmd;
struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
int err;
+ rdata = lpfc_rport_data_from_scsi_device(cmnd->device);
err = fc_remote_port_chkready(rport);
if (err) {
cmnd->result = err;
@@ -5179,10 +5199,11 @@
static int
lpfc_chk_tgt_mapped(struct lpfc_vport *vport, struct scsi_cmnd *cmnd)
{
- struct lpfc_rport_data *rdata = cmnd->device->hostdata;
+ struct lpfc_rport_data *rdata;
struct lpfc_nodelist *pnode;
unsigned long later;
+ rdata = lpfc_rport_data_from_scsi_device(cmnd->device);
if (!rdata) {
lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
"0797 Tgt Map rport failure: rdata x%p\n", rdata);
@@ -5200,7 +5221,7 @@
if (pnode->nlp_state == NLP_STE_MAPPED_NODE)
return SUCCESS;
schedule_timeout_uninterruptible(msecs_to_jiffies(500));
- rdata = cmnd->device->hostdata;
+ rdata = lpfc_rport_data_from_scsi_device(cmnd->device);
if (!rdata)
return FAILED;
pnode = rdata->pnode;
@@ -5272,13 +5293,14 @@
{
struct Scsi_Host *shost = cmnd->device->host;
struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
- struct lpfc_rport_data *rdata = cmnd->device->hostdata;
+ struct lpfc_rport_data *rdata;
struct lpfc_nodelist *pnode;
unsigned tgt_id = cmnd->device->id;
unsigned int lun_id = cmnd->device->lun;
struct lpfc_scsi_event_header scsi_event;
int status;
+ rdata = lpfc_rport_data_from_scsi_device(cmnd->device);
if (!rdata) {
lpfc_printf_vlog(vport, KERN_ERR, LOG_FCP,
"0798 Device Reset rport failure: rdata x%p\n", rdata);
@@ -5341,13 +5363,14 @@
{
struct Scsi_Host *shost = cmnd->device->host;
struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
- struct lpfc_rport_data *rdata = cmnd->device->hostdata;
+ struct lpfc_rport_data *rdata;
struct lpfc_nodelist *pnode;
unsigned tgt_id = cmnd->device->id;
unsigned int lun_id = cmnd->device->lun;
struct lpfc_scsi_event_header scsi_event;
int status;
+ rdata = lpfc_rport_data_from_scsi_device(cmnd->device);
if (!rdata) {
lpfc_printf_vlog(vport, KERN_ERR, LOG_FCP,
"0799 Target Reset rport failure: rdata x%p\n", rdata);
@@ -5547,11 +5570,45 @@
uint32_t num_to_alloc = 0;
int num_allocated = 0;
uint32_t sdev_cnt;
+ struct lpfc_device_data *device_data;
+ unsigned long flags;
+ struct lpfc_name target_wwpn;
if (!rport || fc_remote_port_chkready(rport))
return -ENXIO;
- sdev->hostdata = rport->dd_data;
+ if (phba->cfg_EnableXLane) {
+
+ /*
+ * Check to see if the device data structure for the lun
+ * exists. If not, create one.
+ */
+
+ u64_to_wwn(rport->port_name, target_wwpn.u.wwn);
+ spin_lock_irqsave(&phba->devicelock, flags);
+ device_data = __lpfc_get_device_data(phba,
+ &phba->luns,
+ &vport->fc_portname,
+ &target_wwpn,
+ sdev->lun);
+ if (!device_data) {
+ spin_unlock_irqrestore(&phba->devicelock, flags);
+ device_data = lpfc_create_device_data(phba,
+ &vport->fc_portname,
+ &target_wwpn,
+ sdev->lun, true);
+ if (!device_data)
+ return -ENOMEM;
+ spin_lock_irqsave(&phba->devicelock, flags);
+ list_add_tail(&device_data->listentry, &phba->luns);
+ }
+ device_data->rport_data = rport->dd_data;
+ device_data->available = true;
+ spin_unlock_irqrestore(&phba->devicelock, flags);
+ sdev->hostdata = device_data;
+ } else {
+ sdev->hostdata = rport->dd_data;
+ }
sdev_cnt = atomic_inc_return(&phba->sdev_cnt);
/*
@@ -5641,11 +5698,344 @@
{
struct lpfc_vport *vport = (struct lpfc_vport *) sdev->host->hostdata;
struct lpfc_hba *phba = vport->phba;
+ unsigned long flags;
+ struct lpfc_device_data *device_data = sdev->hostdata;
+
atomic_dec(&phba->sdev_cnt);
+ if ((phba->cfg_EnableXLane) && (device_data)) {
+ spin_lock_irqsave(&phba->devicelock, flags);
+ device_data->available = false;
+ if (!device_data->oas_enabled)
+ lpfc_delete_device_data(phba, device_data);
+ spin_unlock_irqrestore(&phba->devicelock, flags);
+ }
sdev->hostdata = NULL;
return;
}
+/**
+ * lpfc_create_device_data - creates and initializes device data structure for OAS
+ * @pha: Pointer to host bus adapter structure.
+ * @vport_wwpn: Pointer to vport's wwpn information
+ * @target_wwpn: Pointer to target's wwpn information
+ * @lun: Lun on target
+ * @atomic_create: Flag to indicate if memory should be allocated using the
+ * GFP_ATOMIC flag or not.
+ *
+ * This routine creates a device data structure which will contain identifying
+ * information for the device (host wwpn, target wwpn, lun), state of OAS,
+ * whether or not the corresponding lun is available by the system,
+ * and pointer to the rport data.
+ *
+ * Return codes:
+ * NULL - Error
+ * Pointer to lpfc_device_data - Success
+ **/
+struct lpfc_device_data*
+lpfc_create_device_data(struct lpfc_hba *phba, struct lpfc_name *vport_wwpn,
+ struct lpfc_name *target_wwpn, uint64_t lun,
+ bool atomic_create)
+{
+
+ struct lpfc_device_data *lun_info;
+ int memory_flags;
+
+ if (unlikely(!phba) || !vport_wwpn || !target_wwpn ||
+ !(phba->cfg_EnableXLane))
+ return NULL;
+
+ /* Attempt to create the device data to contain lun info */
+
+ if (atomic_create)
+ memory_flags = GFP_ATOMIC;
+ else
+ memory_flags = GFP_KERNEL;
+ lun_info = mempool_alloc(phba->device_data_mem_pool, memory_flags);
+ if (!lun_info)
+ return NULL;
+ INIT_LIST_HEAD(&lun_info->listentry);
+ lun_info->rport_data = NULL;
+ memcpy(&lun_info->device_id.vport_wwpn, vport_wwpn,
+ sizeof(struct lpfc_name));
+ memcpy(&lun_info->device_id.target_wwpn, target_wwpn,
+ sizeof(struct lpfc_name));
+ lun_info->device_id.lun = lun;
+ lun_info->oas_enabled = false;
+ lun_info->available = false;
+ return lun_info;
+}
+
+/**
+ * lpfc_delete_device_data - frees a device data structure for OAS
+ * @pha: Pointer to host bus adapter structure.
+ * @lun_info: Pointer to device data structure to free.
+ *
+ * This routine frees the previously allocated device data structure passed.
+ *
+ **/
+void
+lpfc_delete_device_data(struct lpfc_hba *phba,
+ struct lpfc_device_data *lun_info)
+{
+
+ if (unlikely(!phba) || !lun_info ||
+ !(phba->cfg_EnableXLane))
+ return;
+
+ if (!list_empty(&lun_info->listentry))
+ list_del(&lun_info->listentry);
+ mempool_free(lun_info, phba->device_data_mem_pool);
+ return;
+}
+
+/**
+ * __lpfc_get_device_data - returns the device data for the specified lun
+ * @pha: Pointer to host bus adapter structure.
+ * @list: Point to list to search.
+ * @vport_wwpn: Pointer to vport's wwpn information
+ * @target_wwpn: Pointer to target's wwpn information
+ * @lun: Lun on target
+ *
+ * This routine searches the list passed for the specified lun's device data.
+ * This function does not hold locks, it is the responsibility of the caller
+ * to ensure the proper lock is held before calling the function.
+ *
+ * Return codes:
+ * NULL - Error
+ * Pointer to lpfc_device_data - Success
+ **/
+struct lpfc_device_data*
+__lpfc_get_device_data(struct lpfc_hba *phba, struct list_head *list,
+ struct lpfc_name *vport_wwpn,
+ struct lpfc_name *target_wwpn, uint64_t lun)
+{
+
+ struct lpfc_device_data *lun_info;
+
+ if (unlikely(!phba) || !list || !vport_wwpn || !target_wwpn ||
+ !phba->cfg_EnableXLane)
+ return NULL;
+
+ /* Check to see if the lun is already enabled for OAS. */
+
+ list_for_each_entry(lun_info, list, listentry) {
+ if ((memcmp(&lun_info->device_id.vport_wwpn, vport_wwpn,
+ sizeof(struct lpfc_name)) == 0) &&
+ (memcmp(&lun_info->device_id.target_wwpn, target_wwpn,
+ sizeof(struct lpfc_name)) == 0) &&
+ (lun_info->device_id.lun == lun))
+ return lun_info;
+ }
+
+ return NULL;
+}
+
+/**
+ * lpfc_find_next_oas_lun - searches for the next oas lun
+ * @pha: Pointer to host bus adapter structure.
+ * @vport_wwpn: Pointer to vport's wwpn information
+ * @target_wwpn: Pointer to target's wwpn information
+ * @starting_lun: Pointer to the lun to start searching for
+ * @found_vport_wwpn: Pointer to the found lun's vport wwpn information
+ * @found_target_wwpn: Pointer to the found lun's target wwpn information
+ * @found_lun: Pointer to the found lun.
+ * @found_lun_status: Pointer to status of the found lun.
+ *
+ * This routine searches the luns list for the specified lun
+ * or the first lun for the vport/target. If the vport wwpn contains
+ * a zero value then a specific vport is not specified. In this case
+ * any vport which contains the lun will be considered a match. If the
+ * target wwpn contains a zero value then a specific target is not specified.
+ * In this case any target which contains the lun will be considered a
+ * match. If the lun is found, the lun, vport wwpn, target wwpn and lun status
+ * are returned. The function will also return the next lun if available.
+ * If the next lun is not found, starting_lun parameter will be set to
+ * NO_MORE_OAS_LUN.
+ *
+ * Return codes:
+ * non-0 - Error
+ * 0 - Success
+ **/
+bool
+lpfc_find_next_oas_lun(struct lpfc_hba *phba, struct lpfc_name *vport_wwpn,
+ struct lpfc_name *target_wwpn, uint64_t *starting_lun,
+ struct lpfc_name *found_vport_wwpn,
+ struct lpfc_name *found_target_wwpn,
+ uint64_t *found_lun,
+ uint32_t *found_lun_status)
+{
+
+ unsigned long flags;
+ struct lpfc_device_data *lun_info;
+ struct lpfc_device_id *device_id;
+ uint64_t lun;
+ bool found = false;
+
+ if (unlikely(!phba) || !vport_wwpn || !target_wwpn ||
+ !starting_lun || !found_vport_wwpn ||
+ !found_target_wwpn || !found_lun || !found_lun_status ||
+ (*starting_lun == NO_MORE_OAS_LUN) ||
+ !phba->cfg_EnableXLane)
+ return false;
+
+ lun = *starting_lun;
+ *found_lun = NO_MORE_OAS_LUN;
+ *starting_lun = NO_MORE_OAS_LUN;
+
+ /* Search for lun or the lun closet in value */
+
+ spin_lock_irqsave(&phba->devicelock, flags);
+ list_for_each_entry(lun_info, &phba->luns, listentry) {
+ if (((wwn_to_u64(vport_wwpn->u.wwn) == 0) ||
+ (memcmp(&lun_info->device_id.vport_wwpn, vport_wwpn,
+ sizeof(struct lpfc_name)) == 0)) &&
+ ((wwn_to_u64(target_wwpn->u.wwn) == 0) ||
+ (memcmp(&lun_info->device_id.target_wwpn, target_wwpn,
+ sizeof(struct lpfc_name)) == 0)) &&
+ (lun_info->oas_enabled)) {
+ device_id = &lun_info->device_id;
+ if ((!found) &&
+ ((lun == FIND_FIRST_OAS_LUN) ||
+ (device_id->lun == lun))) {
+ *found_lun = device_id->lun;
+ memcpy(found_vport_wwpn,
+ &device_id->vport_wwpn,
+ sizeof(struct lpfc_name));
+ memcpy(found_target_wwpn,
+ &device_id->target_wwpn,
+ sizeof(struct lpfc_name));
+ if (lun_info->available)
+ *found_lun_status =
+ OAS_LUN_STATUS_EXISTS;
+ else
+ *found_lun_status = 0;
+ if (phba->cfg_oas_flags & OAS_FIND_ANY_VPORT)
+ memset(vport_wwpn, 0x0,
+ sizeof(struct lpfc_name));
+ if (phba->cfg_oas_flags & OAS_FIND_ANY_TARGET)
+ memset(target_wwpn, 0x0,
+ sizeof(struct lpfc_name));
+ found = true;
+ } else if (found) {
+ *starting_lun = device_id->lun;
+ memcpy(vport_wwpn, &device_id->vport_wwpn,
+ sizeof(struct lpfc_name));
+ memcpy(target_wwpn, &device_id->target_wwpn,
+ sizeof(struct lpfc_name));
+ break;
+ }
+ }
+ }
+ spin_unlock_irqrestore(&phba->devicelock, flags);
+ return found;
+}
+
+/**
+ * lpfc_enable_oas_lun - enables a lun for OAS operations
+ * @pha: Pointer to host bus adapter structure.
+ * @vport_wwpn: Pointer to vport's wwpn information
+ * @target_wwpn: Pointer to target's wwpn information
+ * @lun: Lun
+ *
+ * This routine enables a lun for oas operations. The routines does so by
+ * doing the following :
+ *
+ * 1) Checks to see if the device data for the lun has been created.
+ * 2) If found, sets the OAS enabled flag if not set and returns.
+ * 3) Otherwise, creates a device data structure.
+ * 4) If successfully created, indicates the device data is for an OAS lun,
+ * indicates the lun is not available and add to the list of luns.
+ *
+ * Return codes:
+ * false - Error
+ * true - Success
+ **/
+bool
+lpfc_enable_oas_lun(struct lpfc_hba *phba, struct lpfc_name *vport_wwpn,
+ struct lpfc_name *target_wwpn, uint64_t lun)
+{
+
+ struct lpfc_device_data *lun_info;
+ unsigned long flags;
+
+ if (unlikely(!phba) || !vport_wwpn || !target_wwpn ||
+ !phba->cfg_EnableXLane)
+ return false;
+
+ spin_lock_irqsave(&phba->devicelock, flags);
+
+ /* Check to see if the device data for the lun has been created */
+ lun_info = __lpfc_get_device_data(phba, &phba->luns, vport_wwpn,
+ target_wwpn, lun);
+ if (lun_info) {
+ if (!lun_info->oas_enabled)
+ lun_info->oas_enabled = true;
+ spin_unlock_irqrestore(&phba->devicelock, flags);
+ return true;
+ }
+
+ /* Create an lun info structure and add to list of luns */
+ lun_info = lpfc_create_device_data(phba, vport_wwpn, target_wwpn, lun,
+ false);
+ if (lun_info) {
+ lun_info->oas_enabled = true;
+ lun_info->available = false;
+ list_add_tail(&lun_info->listentry, &phba->luns);
+ spin_unlock_irqrestore(&phba->devicelock, flags);
+ return true;
+ }
+ spin_unlock_irqrestore(&phba->devicelock, flags);
+ return false;
+}
+
+/**
+ * lpfc_disable_oas_lun - disables a lun for OAS operations
+ * @pha: Pointer to host bus adapter structure.
+ * @vport_wwpn: Pointer to vport's wwpn information
+ * @target_wwpn: Pointer to target's wwpn information
+ * @lun: Lun
+ *
+ * This routine disables a lun for oas operations. The routines does so by
+ * doing the following :
+ *
+ * 1) Checks to see if the device data for the lun is created.
+ * 2) If present, clears the flag indicating this lun is for OAS.
+ * 3) If the lun is not available by the system, the device data is
+ * freed.
+ *
+ * Return codes:
+ * false - Error
+ * true - Success
+ **/
+bool
+lpfc_disable_oas_lun(struct lpfc_hba *phba, struct lpfc_name *vport_wwpn,
+ struct lpfc_name *target_wwpn, uint64_t lun)
+{
+
+ struct lpfc_device_data *lun_info;
+ unsigned long flags;
+
+ if (unlikely(!phba) || !vport_wwpn || !target_wwpn ||
+ !phba->cfg_EnableXLane)
+ return false;
+
+ spin_lock_irqsave(&phba->devicelock, flags);
+
+ /* Check to see if the lun is available. */
+ lun_info = __lpfc_get_device_data(phba,
+ &phba->luns, vport_wwpn,
+ target_wwpn, lun);
+ if (lun_info) {
+ lun_info->oas_enabled = false;
+ if (!lun_info->available)
+ lpfc_delete_device_data(phba, lun_info);
+ spin_unlock_irqrestore(&phba->devicelock, flags);
+ return true;
+ }
+
+ spin_unlock_irqrestore(&phba->devicelock, flags);
+ return false;
+}
struct scsi_host_template lpfc_template = {
.module = THIS_MODULE,