[PATCH 5/7] nvmet-fc: implement queue_peer_traddr()

[Hannes Reinecke <hare@kernel.org>]

Implement callback to display the peer transport address by
adding a callback 'host_traddr' for nvmet_fc_target_template.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
---
 drivers/nvme/target/fc.c       | 25 +++++++++++++++++++++++++
 include/linux/nvme-fc-driver.h |  1 +
 2 files changed, 26 insertions(+)

diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index fd229f310c93..b0fedff44e51 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -2931,6 +2931,30 @@ nvmet_fc_discovery_chg(struct nvmet_port *port)
 		tgtport->ops->discovery_event(&tgtport->fc_target_port);
 }
 
+static ssize_t
+nvmet_fc_peer_addr(struct nvmet_ctrl *ctrl,
+		   struct nvmet_sq *sq, char *traddr, size_t traddr_size)
+{
+	struct nvmet_fc_tgt_queue *queue =
+		container_of(sq, struct nvmet_fc_tgt_queue, nvme_sq);
+	struct nvmet_fc_tgtport *tgtport = queue->assoc ? queue->assoc->tgtport : NULL;
+	struct nvmet_fc_hostport *hostport = queue->assoc ? queue->assoc->hostport : NULL;
+	ssize_t ret = 0;
+
+	if (!tgtport || !nvmet_fc_tgtport_get(tgtport))
+		return -ENODEV;
+	if (!hostport) {
+		ret = -ENODEV;
+		goto out_put;
+	}
+
+	if (tgtport->ops->host_traddr)
+		ret = tgtport->ops->host_traddr(hostport->hosthandle, traddr, traddr_size);
+out_put:
+	nvmet_fc_tgtport_put(tgtport);
+	return ret;
+}
+
 static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = {
 	.owner			= THIS_MODULE,
 	.type			= NVMF_TRTYPE_FC,
@@ -2940,6 +2964,7 @@ static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = {
 	.queue_response		= nvmet_fc_fcp_nvme_cmd_done,
 	.delete_ctrl		= nvmet_fc_delete_ctrl,
 	.discovery_chg		= nvmet_fc_discovery_chg,
+	.queue_peertraddr	= nvmet_fc_peer_addr,
 };
 
 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 4109f1bd6128..885f2951041b 100644
--- a/include/linux/nvme-fc-driver.h
+++ b/include/linux/nvme-fc-driver.h
@@ -975,6 +975,7 @@ struct nvmet_fc_target_template {
 	void (*ls_abort)(struct nvmet_fc_target_port *targetport,
 				void *hosthandle, struct nvmefc_ls_req *lsreq);
 	void (*host_release)(void *hosthandle);
+	ssize_t (*host_traddr)(void *hosthandle, char *traddr, size_t traddr_size);
 
 	u32	max_hw_queues;
 	u16	max_sgl_segments;
-- 
2.35.3