Commit 6d1555cc authored by Max Gurtovoy's avatar Max Gurtovoy Committed by Christoph Hellwig
Browse files

nvmet: add get_max_queue_size op for controllers 



Some transports, such as RDMA, would like to set the queue size
according to device/port/ctrl characteristics. Add a new nvmet transport
op that is called during ctrl initialization. This will not effect
transports that don't implement this option.

Reviewed-by: default avatarChaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: default avatarMax Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 44c3c625

drivers/nvme/target/core.c

+5 −3
Original line number Diff line number Diff line
@@ -1205,6 +1205,9 @@ static void nvmet_init_cap(struct nvmet_ctrl *ctrl) 
	/* CC.EN timeout in 500msec units: */

	ctrl->cap |= (15ULL << 24);

	/* maximum queue entries supported: */

	if (ctrl->ops->get_max_queue_size)

		ctrl->cap |= ctrl->ops->get_max_queue_size(ctrl) - 1;

	else

		ctrl->cap |= NVMET_QUEUE_SIZE - 1;



	if (nvmet_is_passthru_subsys(ctrl->subsys))
@@ -1367,6 +1370,7 @@ u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn, 
	mutex_init(&ctrl->lock);



	ctrl->port = req->port;

	ctrl->ops = req->ops;



	INIT_WORK(&ctrl->async_event_work, nvmet_async_event_work);

	INIT_LIST_HEAD(&ctrl->async_events);
@@ -1405,8 +1409,6 @@ u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn, 
	}

	ctrl->cntlid = ret;



	ctrl->ops = req->ops;



	/*

	 * Discovery controllers may use some arbitrary high value

	 * in order to cleanup stale discovery sessions

drivers/nvme/target/nvmet.h

+1 −0
Original line number Diff line number Diff line
@@ -309,6 +309,7 @@ struct nvmet_fabrics_ops { 
	u16 (*install_queue)(struct nvmet_sq *nvme_sq);

	void (*discovery_chg)(struct nvmet_port *port);

	u8 (*get_mdts)(const struct nvmet_ctrl *ctrl);

	u16 (*get_max_queue_size)(const struct nvmet_ctrl *ctrl);

};



#define NVMET_MAX_INLINE_BIOVEC	8