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Commit fe4a9791 authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

nvme-loop: add support for multiple ports 



This is useful at least for multipath testing.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
parent 90ea5ca4

drivers/nvme/target/loop.c

+30 −18
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ struct nvme_loop_ctrl { 
	struct nvme_ctrl	ctrl;



	struct nvmet_ctrl	*target_ctrl;

	struct nvmet_port	*port;

};



static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl)
@@ -63,7 +64,8 @@ struct nvme_loop_queue { 
	unsigned long		flags;

};



static struct nvmet_port *nvmet_loop_port;

static LIST_HEAD(nvme_loop_ports);

static DEFINE_MUTEX(nvme_loop_ports_mutex);



static LIST_HEAD(nvme_loop_ctrl_list);

static DEFINE_MUTEX(nvme_loop_ctrl_mutex);
@@ -169,7 +171,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, 


	blk_mq_start_request(req);

	iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;

	iod->req.port = nvmet_loop_port;

	iod->req.port = queue->ctrl->port;

	if (!nvmet_req_init(&iod->req, &queue->nvme_cq,

			&queue->nvme_sq, &nvme_loop_ops))

		return BLK_STS_OK;
@@ -517,6 +519,7 @@ static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { 
	.free_ctrl		= nvme_loop_free_ctrl,

	.submit_async_event	= nvme_loop_submit_async_event,

	.delete_ctrl		= nvme_loop_delete_ctrl_host,

	.get_address		= nvmf_get_address,

};



static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl)
@@ -565,6 +568,23 @@ static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) 
	return ret;

}



static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl)

{

	struct nvmet_port *p, *found = NULL;



	mutex_lock(&nvme_loop_ports_mutex);

	list_for_each_entry(p, &nvme_loop_ports, entry) {

		/* if no transport address is specified use the first port */

		if ((ctrl->opts->mask & NVMF_OPT_TRADDR) &&

		    strcmp(ctrl->opts->traddr, p->disc_addr.traddr))

			continue;

		found = p;

		break;

	}

	mutex_unlock(&nvme_loop_ports_mutex);

	return found;

}



static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,

		struct nvmf_ctrl_options *opts)

{
@@ -589,6 +609,7 @@ static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, 


	ctrl->ctrl.sqsize = opts->queue_size - 1;

	ctrl->ctrl.kato = opts->kato;

	ctrl->port = nvme_loop_find_port(&ctrl->ctrl);



	ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues),

			GFP_KERNEL);
@@ -646,27 +667,17 @@ static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, 


static int nvme_loop_add_port(struct nvmet_port *port)

{

	/*

	 * XXX: disalow adding more than one port so

	 * there is no connection rejections when a

	 * a subsystem is assigned to a port for which

	 * loop doesn't have a pointer.

	 * This scenario would be possible if we allowed

	 * more than one port to be added and a subsystem

	 * was assigned to a port other than nvmet_loop_port.

	 */



	if (nvmet_loop_port)

		return -EPERM;



	nvmet_loop_port = port;

	mutex_lock(&nvme_loop_ports_mutex);

	list_add_tail(&port->entry, &nvme_loop_ports);

	mutex_unlock(&nvme_loop_ports_mutex);

	return 0;

}



static void nvme_loop_remove_port(struct nvmet_port *port)

{

	if (port == nvmet_loop_port)

		nvmet_loop_port = NULL;

	mutex_lock(&nvme_loop_ports_mutex);

	list_del_init(&port->entry);

	mutex_unlock(&nvme_loop_ports_mutex);

}



static const struct nvmet_fabrics_ops nvme_loop_ops = {
@@ -682,6 +693,7 @@ static struct nvmf_transport_ops nvme_loop_transport = { 
	.name		= "loop",

	.module		= THIS_MODULE,

	.create_ctrl	= nvme_loop_create_ctrl,

	.allowed_opts	= NVMF_OPT_TRADDR,

};



static int __init nvme_loop_init_module(void)

drivers/nvme/target/nvmet.h

+1 −1
Original line number Diff line number Diff line
@@ -85,7 +85,7 @@ struct nvmet_sq { 
/**

 * struct nvmet_port -	Common structure to keep port

 *				information for the target.

 * @entry:		List head for holding a list of these elements.

 * @entry:		Entry into referrals or transport list.

 * @disc_addr:		Address information is stored in a format defined

 *				for a discovery log page entry.

 * @group:		ConfigFS group for this element's folder.