This patch adds support for transport events to signal discovery
controller changes.
Add new lldd api for a subsystem change. The lldd is to generate the
appropriate RSCN for the FC-NVME targetport.
Add transport op for discov_chg callback from the nvmet layer.
Signed-off-by: James Smart <james.smart@xxxxxxxxxxxx>
---
drivers/nvme/target/fc.c | 10 ++++++++++
include/linux/nvme-fc-driver.h | 6 ++++++
2 files changed, 16 insertions(+)
diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index 58e010bdda3e..590133c35d11 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -2546,6 +2546,15 @@ nvmet_fc_remove_port(struct nvmet_port *port)
nvmet_fc_tgtport_put(tgtport);
}
+static void
+nvmet_fc_port_subsys_event(struct nvmet_port *port)
+{
+ struct nvmet_fc_tgtport *tgtport = port->priv;
+
+ if (tgtport && tgtport->ops->nvme_subsystem_change)
+ tgtport->ops->nvme_subsystem_change(&tgtport->fc_target_port);
+}
+
static struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = {
.owner = THIS_MODULE,
.type = NVMF_TRTYPE_FC,
@@ -2554,6 +2563,7 @@ static 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,
+ .discov_chg = nvmet_fc_port_subsys_event,
};
static int __init nvmet_fc_init_module(void)
diff --git a/include/linux/nvme-fc-driver.h b/include/linux/nvme-fc-driver.h
index 2be4db353937..ac9d7f190650 100644
--- a/include/linux/nvme-fc-driver.h
+++ b/include/linux/nvme-fc-driver.h
@@ -344,6 +344,11 @@ struct nvme_fc_remote_port {
* indicating an FC transport Aborted status.
* Entrypoint is Mandatory.
*
+ * @nvme_subsystem_change: Called by the transport to generate FC state change
+ * notifications to NVME initiators. The state change notifications should
+ * cause the initiator to reconnect to the discovery controller on the
+ * targetport to look for new discovery log records.
+ *
* @max_hw_queues: indicates the maximum number of hw queues the LLDD
* supports for cpu affinitization.
* Value is Mandatory. Must be at least 1.
@@ -856,6 +861,7 @@ 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 (*nvme_subsystem_change)(struct nvmet_fc_target_port *tgtport);
u32 max_hw_queues;
u16 max_sgl_segments;
--
2.13.1
