nvme-fcloop: refactor to enable target to host LS

Currently nvmefc-loop only sends LS's from host to target.
Slightly rework data structures and routine names to reflect this
path. Allows a straight-forward conversion to be used by ls's
from target to host.
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/nvme/target/fcloop.c

@@ -226,9 +226,15 @@ struct fcloop_nport {
 	u32 port_id;
 };
 
+enum {
+	H2T	= 0,
+	T2H	= 1,
+};
+
 struct fcloop_lsreq {
 	struct nvmefc_ls_req		*lsreq;
 	struct nvmefc_ls_rsp		ls_rsp;
+	int				lsdir;	/* H2T or T2H */
 	int				status;
 	struct list_head		ls_list; /* fcloop_rport->ls_list */
 };
@@ -323,7 +329,7 @@ fcloop_rport_lsrqst_work(struct work_struct *work)
 }
 
 static int
-fcloop_ls_req(struct nvme_fc_local_port *localport,
+fcloop_h2t_ls_req(struct nvme_fc_local_port *localport,
 			struct nvme_fc_remote_port *remoteport,
 			struct nvmefc_ls_req *lsreq)
 {
@@ -331,6 +337,7 @@ fcloop_ls_req(struct nvme_fc_local_port *localport,
 	struct fcloop_rport *rport = remoteport->private;
 	int ret = 0;
 
+	tls_req->lsdir = H2T;
 	tls_req->lsreq = lsreq;
 	INIT_LIST_HEAD(&tls_req->ls_list);
 
@@ -351,7 +358,7 @@ fcloop_ls_req(struct nvme_fc_local_port *localport,
 }
 
 static int
-fcloop_xmt_ls_rsp(struct nvmet_fc_target_port *targetport,
+fcloop_h2t_xmt_ls_rsp(struct nvmet_fc_target_port *targetport,
 			struct nvmefc_ls_rsp *lsrsp)
 {
 	struct fcloop_lsreq *tls_req = ls_rsp_to_lsreq(lsrsp);
@@ -762,7 +769,7 @@ fcloop_fcp_req_release(struct nvmet_fc_target_port *tgtport,
 }
 
 static void
-fcloop_ls_abort(struct nvme_fc_local_port *localport,
+fcloop_h2t_ls_abort(struct nvme_fc_local_port *localport,
 			struct nvme_fc_remote_port *remoteport,
 				struct nvmefc_ls_req *lsreq)
 {
@@ -879,9 +886,9 @@ static struct nvme_fc_port_template fctemplate = {
 	.remoteport_delete	= fcloop_remoteport_delete,
 	.create_queue		= fcloop_create_queue,
 	.delete_queue		= fcloop_delete_queue,
-	.ls_req			= fcloop_ls_req,
+	.ls_req			= fcloop_h2t_ls_req,
 	.fcp_io			= fcloop_fcp_req,
-	.ls_abort		= fcloop_ls_abort,
+	.ls_abort		= fcloop_h2t_ls_abort,
 	.fcp_abort		= fcloop_fcp_abort,
 	.max_hw_queues		= FCLOOP_HW_QUEUES,
 	.max_sgl_segments	= FCLOOP_SGL_SEGS,
@@ -896,7 +903,7 @@ static struct nvme_fc_port_template fctemplate = {
 
 static struct nvmet_fc_target_template tgttemplate = {
 	.targetport_delete	= fcloop_targetport_delete,
-	.xmt_ls_rsp		= fcloop_xmt_ls_rsp,
+	.xmt_ls_rsp		= fcloop_h2t_xmt_ls_rsp,
 	.fcp_op			= fcloop_fcp_op,
 	.fcp_abort		= fcloop_tgt_fcp_abort,
 	.fcp_req_release	= fcloop_fcp_req_release,