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nvme-fc: add a dev_loss_tmo field to the remoteport 

Add a dev_loss_tmo value, paralleling the SCSI FC transport, for device
connectivity loss.

The transport initializes the value in the nvme_fc_register_remoteport()
call. If the value is not set, a default of 60s is set.

Add a new routine to the api, nvme_fc_set_remoteport_devloss() routine,
which allows the lldd to dynamically update the value on an existing
remoteport.

Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
James Smart 2017-10-25 16:43:15 -07:00 committed by Christoph Hellwig
parent 44c6ec77e1
commit ac7fe82b6f
2 changed files with 40 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/nvme/host/fc.c
View File

@ -45,6 +45,8 @@ enum nvme_fc_queue_flags {
#define NVMEFC_QUEUE_DELAY 3 /* ms units */
#define NVME_FC_DEFAULT_DEV_LOSS_TMO 60 /* seconds */
struct nvme_fc_queue {
struct nvme_fc_ctrl *ctrl;
struct device *dev;
@ -585,6 +587,11 @@ nvme_fc_register_remoteport(struct nvme_fc_local_port *localport,
newrec->remoteport.port_id = pinfo->port_id;
newrec->remoteport.port_state = FC_OBJSTATE_ONLINE;
newrec->remoteport.port_num = idx;
/* a registration value of dev_loss_tmo=0 results in the default */
if (pinfo->dev_loss_tmo)
newrec->remoteport.dev_loss_tmo = pinfo->dev_loss_tmo;
else
newrec->remoteport.dev_loss_tmo = NVME_FC_DEFAULT_DEV_LOSS_TMO;
spin_lock_irqsave(&nvme_fc_lock, flags);
list_add_tail(&newrec->endp_list, &lport->endp_list);
@ -688,6 +695,30 @@ nvme_fc_rescan_remoteport(struct nvme_fc_remote_port *remoteport)
}
EXPORT_SYMBOL_GPL(nvme_fc_rescan_remoteport);
int
nvme_fc_set_remoteport_devloss(struct nvme_fc_remote_port *portptr,
u32 dev_loss_tmo)
{
struct nvme_fc_rport *rport = remoteport_to_rport(portptr);
struct nvme_fc_ctrl *ctrl;
unsigned long flags;
spin_lock_irqsave(&rport->lock, flags);
if (portptr->port_state != FC_OBJSTATE_ONLINE) {
spin_unlock_irqrestore(&rport->lock, flags);
return -EINVAL;
}
/* a dev_loss_tmo of 0 (immediate) is allowed to be set */
rport->remoteport.dev_loss_tmo = dev_loss_tmo;
spin_unlock_irqrestore(&rport->lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(nvme_fc_set_remoteport_devloss);
/* *********************** FC-NVME DMA Handling **************************** */

11
include/linux/nvme-fc-driver.h
View File

@ -40,6 +40,8 @@
* @node_name: FC WWNN for the port
* @port_name: FC WWPN for the port
* @port_role: What NVME roles are supported (see FC_PORT_ROLE_xxx)
* @dev_loss_tmo: maximum delay for reconnects to an association on
* this device. Used only on a remoteport.
*
* Initialization values for dynamic port fields:
* @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must
@ -50,6 +52,7 @@ struct nvme_fc_port_info {
u64 port_name;
u32 port_role;
u32 port_id;
u32 dev_loss_tmo;
};
@ -200,6 +203,9 @@ enum nvme_fc_obj_state {
* The length of the buffer corresponds to the local_priv_sz
* value specified in the nvme_fc_port_template supplied by
* the LLDD.
* @dev_loss_tmo: maximum delay for reconnects to an association on
* this device. To modify, lldd must call
* nvme_fc_set_remoteport_devloss().
*
* Fields with dynamic values. Values may change base on link state. LLDD
* may reference fields directly to change them. Initialized by the
@ -257,10 +263,9 @@ struct nvme_fc_remote_port {
u32 port_role;
u64 node_name;
u64 port_name;
struct nvme_fc_local_port *localport;
void *private;
u32 dev_loss_tmo;
/* dynamic fields */
u32 port_id;
@ -446,6 +451,8 @@ int nvme_fc_unregister_remoteport(struct nvme_fc_remote_port *remoteport);
void nvme_fc_rescan_remoteport(struct nvme_fc_remote_port *remoteport);
int nvme_fc_set_remoteport_devloss(struct nvme_fc_remote_port *remoteport,
u32 dev_loss_tmo);
/*