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nvmet-fc: add transport discovery change event callback support

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This patch adds support for the nvmet discovery_change transport op.
In turn, the transport adds it's own LLDD api callback discovery_event
op to request the LLDD to generate an RSCN for the discovery change.

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 14:58:03 -07:00 committed by Christoph Hellwig
parent 9d09dd8d76
commit 150d71f725
2 changed files with 17 additions and 0 deletions
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11
drivers/nvme/target/fc.c
View File

@ -2549,6 +2549,16 @@ nvmet_fc_remove_port(struct nvmet_port *port)
kfree(pe);
}
static void
nvmet_fc_discovery_chg(struct nvmet_port *port)
{
struct nvmet_fc_port_entry *pe = port->priv;
struct nvmet_fc_tgtport *tgtport = pe->tgtport;
if (tgtport && tgtport->ops->discovery_event)
tgtport->ops->discovery_event(&tgtport->fc_target_port);
}
static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = {
.owner = THIS_MODULE,
.type = NVMF_TRTYPE_FC,
@ -2557,6 +2567,7 @@ static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = {
.remove_port = nvmet_fc_remove_port,
.queue_response = nvmet_fc_fcp_nvme_cmd_done,
.delete_ctrl = nvmet_fc_delete_ctrl,
.discovery_chg = nvmet_fc_discovery_chg,
};
static int __init nvmet_fc_init_module(void)

6
include/linux/nvme-fc-driver.h
View File

@ -791,6 +791,11 @@ struct nvmet_fc_target_port {
* nvmefc_tgt_fcp_req.
* Entrypoint is Optional.
*
* @discovery_event: Called by the transport to generate an RSCN
* change notifications to NVME initiators. The RSCN notifications
* should cause the initiator to rescan the discovery controller
* on the targetport.
*
* @max_hw_queues: indicates the maximum number of hw queues the LLDD
* supports for cpu affinitization.
* Value is Mandatory. Must be at least 1.
@ -832,6 +837,7 @@ struct nvmet_fc_target_template {
struct nvmefc_tgt_fcp_req *fcpreq);
void (*defer_rcv)(struct nvmet_fc_target_port *tgtport,
struct nvmefc_tgt_fcp_req *fcpreq);
void (*discovery_event)(struct nvmet_fc_target_port *tgtport);
u32 max_hw_queues;
u16 max_sgl_segments;