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nvmet: add transport discovery change op 

Some transports, such as FC-NVME, support discovery controller change
events without the use of a persistent discovery controller. FC receives
events via RSCN from the FC Fabric Controller or subsystem FC port.

This patch adds a nvmet transport op that is called whenever a
discovery change event occurs in the nvmet layer.

To facilitate the callback without adding another layer to cross into
core.c to reference the transport ops, the port structure snapshots
the transport ops when the port is enabled and clears them when disabled.

Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
James Smart 2019-05-14 14:58:02 -07:00 committed by Christoph Hellwig
parent 474a280036
commit 9d09dd8d76
3 changed files with 8 additions and 0 deletions
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2
drivers/nvme/target/core.c
View File

@ -311,6 +311,7 @@ int nvmet_enable_port(struct nvmet_port *port)
port->inline_data_size = 0;
port->enabled = true;
port->tr_ops = ops;
return 0;
}
@ -321,6 +322,7 @@ void nvmet_disable_port(struct nvmet_port *port)
lockdep_assert_held(&nvmet_config_sem);
port->enabled = false;
port->tr_ops = NULL;
ops = nvmet_transports[port->disc_addr.trtype];
ops->remove_port(port);

4
drivers/nvme/target/discovery.c
View File

@ -41,6 +41,10 @@ void nvmet_port_disc_changed(struct nvmet_port *port,
__nvmet_disc_changed(port, ctrl);
}
mutex_unlock(&nvmet_disc_subsys->lock);
/* If transport can signal change, notify transport */
if (port->tr_ops && port->tr_ops->discovery_chg)
port->tr_ops->discovery_chg(port);
}
static void __nvmet_subsys_disc_changed(struct nvmet_port *port,

2
drivers/nvme/target/nvmet.h
View File

@ -140,6 +140,7 @@ struct nvmet_port {
void *priv;
bool enabled;
int inline_data_size;
const struct nvmet_fabrics_ops *tr_ops;
};
static inline struct nvmet_port *to_nvmet_port(struct config_item *item)
@ -277,6 +278,7 @@ struct nvmet_fabrics_ops {
void (*disc_traddr)(struct nvmet_req *req,
struct nvmet_port *port, char *traddr);
u16 (*install_queue)(struct nvmet_sq *nvme_sq);
void (*discovery_chg)(struct nvmet_port *port);
};
#define NVMET_MAX_INLINE_BIOVEC 8