Re: [PATCH v10 14/20] dlb: add start domain ioctl

Add ioctl to start a domain. Once a scheduling domain and its resources
have been configured, this ioctl is called to allow the domain's ports to
begin enqueueing to the device. Once started, the domain's resources cannot
be configured again until after the domain is reset.

This ioctl instructs the DLB device to start load-balancing operations.
It corresponds to rte_event_dev_start() function in DPDK' eventdev library.

Signed-off-by: Gage Eads <redacted>
Signed-off-by: Mike Ximing Chen <redacted>
Reviewed-by: Björn Töpel <redacted>
Reviewed-by: Dan Williams <redacted>
---
 drivers/misc/dlb/dlb_ioctl.c    |   3 +
 drivers/misc/dlb/dlb_main.h     |   4 ++
 drivers/misc/dlb/dlb_pf_ops.c   |   9 +++
 drivers/misc/dlb/dlb_resource.c | 116 ++++++++++++++++++++++++++++++++
 drivers/misc/dlb/dlb_resource.h |   4 ++
 include/uapi/linux/dlb.h        |  22 ++++++
 6 files changed, 158 insertions(+)

diff --git a/drivers/misc/dlb/dlb_ioctl.c b/drivers/misc/dlb/dlb_ioctl.c
index 6a311b969643..9b05344f03c8 100644
--- a/drivers/misc/dlb/dlb_ioctl.c
+++ b/drivers/misc/dlb/dlb_ioctl.c

@@ -51,6 +51,7 @@ DLB_DOMAIN_IOCTL_CALLBACK_TEMPLATE(create_ldb_queue)
 DLB_DOMAIN_IOCTL_CALLBACK_TEMPLATE(create_dir_queue)
 DLB_DOMAIN_IOCTL_CALLBACK_TEMPLATE(get_ldb_queue_depth)
 DLB_DOMAIN_IOCTL_CALLBACK_TEMPLATE(get_dir_queue_depth)
+DLB_DOMAIN_IOCTL_CALLBACK_TEMPLATE(start_domain)
 
 /*
  * Port creation ioctls don't use the callback template macro.

@@ -322,6 +323,8 @@ long dlb_domain_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 		return dlb_domain_ioctl_get_dir_port_pp_fd(dlb, dom, arg);
 	case DLB_IOC_GET_DIR_PORT_CQ_FD:
 		return dlb_domain_ioctl_get_dir_port_cq_fd(dlb, dom, arg);
+	case DLB_IOC_START_DOMAIN:
+		return dlb_domain_ioctl_start_domain(dlb, dom, arg);
 	default:
 		return -ENOTTY;
 	}

diff --git a/drivers/misc/dlb/dlb_main.h b/drivers/misc/dlb/dlb_main.h
index 477974e1a178..2f3096a45b1e 100644
--- a/drivers/misc/dlb/dlb_main.h
+++ b/drivers/misc/dlb/dlb_main.h

@@ -63,6 +63,10 @@ struct dlb_device_ops {
 			       struct dlb_create_dir_port_args *args,
 			       uintptr_t cq_dma_base,
 			       struct dlb_cmd_response *resp);
+	int (*start_domain)(struct dlb_hw *hw,
+			    u32 domain_id,
+			    struct dlb_start_domain_args *args,
+			    struct dlb_cmd_response *resp);
 	int (*get_num_resources)(struct dlb_hw *hw,
 				 struct dlb_get_num_resources_args *args);
 	int (*reset_domain)(struct dlb_hw *hw, u32 domain_id);

diff --git a/drivers/misc/dlb/dlb_pf_ops.c b/drivers/misc/dlb/dlb_pf_ops.c
index 02a188aa5a60..ce9d29b94a55 100644
--- a/drivers/misc/dlb/dlb_pf_ops.c
+++ b/drivers/misc/dlb/dlb_pf_ops.c

@@ -160,6 +160,14 @@ dlb_pf_create_dir_port(struct dlb_hw *hw, u32 id,
 				       resp, false, 0);
 }
 
+static int
+dlb_pf_start_domain(struct dlb_hw *hw, u32 id,
+		    struct dlb_start_domain_args *args,
+		    struct dlb_cmd_response *resp)
+{
+	return dlb_hw_start_domain(hw, id, args, resp, false, 0);
+}
+
 static int dlb_pf_get_num_resources(struct dlb_hw *hw,
 				    struct dlb_get_num_resources_args *args)
 {

@@ -232,6 +240,7 @@ struct dlb_device_ops dlb_pf_ops = {
 	.create_dir_queue = dlb_pf_create_dir_queue,
 	.create_ldb_port = dlb_pf_create_ldb_port,
 	.create_dir_port = dlb_pf_create_dir_port,
+	.start_domain = dlb_pf_start_domain,