octeon_ep: implement device unload control net API

Device unload control net function should inform firmware
of driver unload to let it take necessary actions to cleanup.
Signed-off-by: Shinas Rasheed <srasheed@marvell.com>
Link: https://lore.kernel.org/r/20231129045348.2538843-2-srasheed@marvell.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.c

@@ -26,7 +26,7 @@ static atomic_t ctrl_net_msg_id;
 
 /* Control plane version in which OCTEP_CTRL_NET_H2F_CMD was added */
 static const u32 octep_ctrl_net_h2f_cmd_versions[OCTEP_CTRL_NET_H2F_CMD_MAX] = {
-	[OCTEP_CTRL_NET_H2F_CMD_INVALID ... OCTEP_CTRL_NET_H2F_CMD_GET_INFO] =
+	[OCTEP_CTRL_NET_H2F_CMD_INVALID ... OCTEP_CTRL_NET_H2F_CMD_DEV_REMOVE] =
 	 OCTEP_CP_VERSION(1, 0, 0)
 };
 
@@ -393,10 +393,24 @@ int octep_ctrl_net_get_info(struct octep_device *oct, int vfid,
 	return 0;
 }
 
+int octep_ctrl_net_dev_remove(struct octep_device *oct, int vfid)
+{
+	struct octep_ctrl_net_wait_data d = {};
+	struct octep_ctrl_net_h2f_req *req;
+
+	req = &d.data.req;
+	dev_dbg(&oct->pdev->dev, "Sending dev_unload msg to fw\n");
+	init_send_req(&d.msg, req, sizeof(int), vfid);
+	req->hdr.s.cmd = OCTEP_CTRL_NET_H2F_CMD_DEV_REMOVE;
+
+	return octep_send_mbox_req(oct, &d, false);
+}
 int octep_ctrl_net_uninit(struct octep_device *oct)
 {
 	struct octep_ctrl_net_wait_data *pos, *n;
 
+	octep_ctrl_net_dev_remove(oct, OCTEP_CTRL_NET_INVALID_VFID);
+
 	list_for_each_entry_safe(pos, n, &oct->ctrl_req_wait_list, list)
 		pos->done = 1;
 

drivers/net/ethernet/marvell/octeon_ep/octep_ctrl_net.h

@@ -42,6 +42,7 @@ enum octep_ctrl_net_h2f_cmd {
 	OCTEP_CTRL_NET_H2F_CMD_RX_STATE,
 	OCTEP_CTRL_NET_H2F_CMD_LINK_INFO,
 	OCTEP_CTRL_NET_H2F_CMD_GET_INFO,
+	OCTEP_CTRL_NET_H2F_CMD_DEV_REMOVE,
 	OCTEP_CTRL_NET_H2F_CMD_MAX
 };
 
@@ -370,6 +371,16 @@ void octep_ctrl_net_recv_fw_messages(struct octep_device *oct);
 int octep_ctrl_net_get_info(struct octep_device *oct, int vfid,
 			    struct octep_fw_info *info);
 
+/**
+ * octep_ctrl_net_dev_remove() - Indicate to firmware that a device unload has happened.
+ *
+ * @oct: non-null pointer to struct octep_device.
+ * @vfid: Index of virtual function.
+ *
+ * return value: 0 on success, -errno on failure.
+ */
+int octep_ctrl_net_dev_remove(struct octep_device *oct, int vfid);
+
 /**
  * octep_ctrl_net_uninit() - Uninitialize data for ctrl net.
  *