nvmet-tcp: implement host_traddr()

Implement callback to display the host transport address.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>

Author: Hannes Reinecke

drivers/nvme/target/tcp.c

@@ -2167,6 +2167,19 @@ static void nvmet_tcp_disc_port_addr(struct nvmet_req *req,
 	}
 }
 
+static ssize_t nvmet_tcp_host_port_addr(struct nvmet_ctrl *ctrl,
+			char *traddr, size_t traddr_len)
+{
+	struct nvmet_sq *sq = ctrl->sqs[0];
+	struct nvmet_tcp_queue *queue =
+		container_of(sq, struct nvmet_tcp_queue, nvme_sq);
+
+	if (queue->sockaddr_peer.ss_family == AF_UNSPEC)
+		return -EINVAL;
+	return snprintf(traddr, traddr_len, "%pISc",
+			(struct sockaddr *)&queue->sockaddr_peer);
+}
+
 static const struct nvmet_fabrics_ops nvmet_tcp_ops = {
 	.owner			= THIS_MODULE,
 	.type			= NVMF_TRTYPE_TCP,
@@ -2177,6 +2190,7 @@ static const struct nvmet_fabrics_ops nvmet_tcp_ops = {
 	.delete_ctrl		= nvmet_tcp_delete_ctrl,
 	.install_queue		= nvmet_tcp_install_queue,
 	.disc_traddr		= nvmet_tcp_disc_port_addr,
+	.host_traddr		= nvmet_tcp_host_port_addr,
 };
 
 static int __init nvmet_tcp_init(void)