From: James Smart <jsmart2021@gmail.com>
Date: Thu, 14 Sep 2017 10:38:41 -0700
Subject: nvme-fc: create fc class and transport device
Patch-mainline: v4.15-rc1
Git-commit: 5f5685569ae8fccb0344373d823f2e4c59bb3d8e
References: FATE#323952, FATE#322506
Added a new fc class and a device node for udev events under it. I
expect the fc class will eventually be the location where the FC SCSI and
FC NVME merge in the future. Therefore names are kept somewhat generic.
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/nvme/host/fc.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 54 insertions(+), 1 deletion(-)
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -213,6 +213,13 @@ static DEFINE_IDA(nvme_fc_ctrl_cnt);
+/*
+ * These items are short-term. They will eventually be moved into
+ * a generic FC class. See comments in module init.
+ */
+static struct class *fc_class;
+static struct device *fc_udev_device;
+
/* *********************** FC-NVME Port Management ************************ */
@@ -2997,7 +3004,50 @@ static struct nvmf_transport_ops nvme_fc
static int __init nvme_fc_init_module(void)
{
- return nvmf_register_transport(&nvme_fc_transport);
+ int ret;
+
+ /*
+ * NOTE:
+ * It is expected that in the future the kernel will combine
+ * the FC-isms that are currently under scsi and now being
+ * added to by NVME into a new standalone FC class. The SCSI
+ * and NVME protocols and their devices would be under this
+ * new FC class.
+ *
+ * As we need something to post FC-specific udev events to,
+ * specifically for nvme probe events, start by creating the
+ * new device class. When the new standalone FC class is
+ * put in place, this code will move to a more generic
+ * location for the class.
+ */
+ fc_class = class_create(THIS_MODULE, "fc");
+ if (IS_ERR(fc_class)) {
+ pr_err("couldn't register class fc\n");
+ return PTR_ERR(fc_class);
+ }
+
+ /*
+ * Create a device for the FC-centric udev events
+ */
+ fc_udev_device = device_create(fc_class, NULL, MKDEV(0, 0), NULL,
+ "fc_udev_device");
+ if (IS_ERR(fc_udev_device)) {
+ pr_err("couldn't create fc_udev device!\n");
+ ret = PTR_ERR(fc_udev_device);
+ goto out_destroy_class;
+ }
+
+ ret = nvmf_register_transport(&nvme_fc_transport);
+ if (ret)
+ goto out_destroy_device;
+
+ return 0;
+
+out_destroy_device:
+ device_destroy(fc_class, MKDEV(0, 0));
+out_destroy_class:
+ class_destroy(fc_class);
+ return ret;
}
static void __exit nvme_fc_exit_module(void)
@@ -3010,6 +3060,9 @@ static void __exit nvme_fc_exit_module(v
ida_destroy(&nvme_fc_local_port_cnt);
ida_destroy(&nvme_fc_ctrl_cnt);
+
+ device_destroy(fc_class, MKDEV(0, 0));
+ class_destroy(fc_class);
}
module_init(nvme_fc_init_module);