[PATCH v2 6/7] nvme-fc: add nvme_fc_set_remoteport_fpin()

[Jesse Taube <jtaubepe@redhat.com>]

Add nvme_fc_set_remoteport_fpin() and supporting functions. This
function is called by the SCSI FC transport and driver layer to set or
clear the 'marginal' path status for a specific rport.

Co-developed-by: Hannes Reinecke <hare@kernel.org>
Signed-off-by: Hannes Reinecke <hare@kernel.org>
Signed-off-by: John Meneghini <jmeneghi@redhat.com>
Signed-off-by: Jesse Taube <jtaubepe@redhat.com>
---
V10 -> V1:
 - Remove nvme_fc_modify_rport_fpin_state
 - Use struct nvme_fc_remote_port instead of wwpn and wwnn
V1 -> V2:
 - Use nvme_ctrl_assign_marginal over set/clear_bit
---
 drivers/nvme/host/fc.c         | 13 +++++++++++++
 include/linux/nvme-fc-driver.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 7886c0dcc626..c4810d048b87 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -895,6 +895,19 @@ nvme_fc_set_remoteport_devloss(struct nvme_fc_remote_port *portptr,
 }
 EXPORT_SYMBOL_GPL(nvme_fc_set_remoteport_devloss);
 
+void
+nvme_fc_set_remoteport_fpin(struct nvme_fc_remote_port *portptr, bool marginal)
+{
+	struct nvme_fc_rport *rport = remoteport_to_rport(portptr);
+	struct nvme_fc_ctrl *ctrl;
+	unsigned long flags;
+
+	spin_lock_irqsave(&rport->lock, flags);
+	list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list)
+		nvme_ctrl_assign_marginal(&ctrl->ctrl, marginal);
+	spin_unlock_irqrestore(&rport->lock, flags);
+}
+EXPORT_SYMBOL_GPL(nvme_fc_set_remoteport_fpin);
 
 /* *********************** FC-NVME DMA Handling **************************** */
 
diff --git a/include/linux/nvme-fc-driver.h b/include/linux/nvme-fc-driver.h
index 9f6acadfe0c8..95d79386d126 100644
--- a/include/linux/nvme-fc-driver.h
+++ b/include/linux/nvme-fc-driver.h
@@ -536,6 +536,8 @@ void nvme_fc_rescan_remoteport(struct nvme_fc_remote_port *remoteport);
 int nvme_fc_set_remoteport_devloss(struct nvme_fc_remote_port *remoteport,
 			u32 dev_loss_tmo);
 
+void nvme_fc_set_remoteport_fpin(struct nvme_fc_remote_port *portptr, bool marginal);
+
 /*
  * Routine called to pass a NVME-FC LS request, received by the lldd,
  * to the nvme-fc transport.
-- 
2.55.0