Merge branch 'net-hns3-use-seq_file-for-debugfs'

Jijie Shao says:

====================
net: hns3: use seq_file for debugfs

Arnd reported that there are two build warning for on-stasck
buffer oversize. As Arnd's suggestion, using seq file way
to avoid the stack buffer or kmalloc buffer allocating.

v2: https://lore.kernel.org/[email protected]
v1: https://lore.kernel.org/[email protected]
====================

Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: kuba-moo

drivers/net/ethernet/hisilicon/hns3/hnae3.h

@@ -339,6 +339,10 @@ enum hnae3_dbg_cmd {
 	HNAE3_DBG_CMD_UNKNOWN,
 };
 
+#define hnae3_seq_file_to_ae_dev(s)	(dev_get_drvdata((s)->private))
+#define hnae3_seq_file_to_handle(s)	\
+		(((struct hnae3_ae_dev *)hnae3_seq_file_to_ae_dev(s))->handle)
+
 enum hnae3_tc_map_mode {
 	HNAE3_TC_MAP_MODE_PRIO,
 	HNAE3_TC_MAP_MODE_DSCP,
@@ -434,8 +438,11 @@ struct hnae3_ae_dev {
 	u32 dev_version;
 	DECLARE_BITMAP(caps, HNAE3_DEV_CAPS_MAX_NUM);
 	void *priv;
+	struct hnae3_handle *handle;
 };
 
+typedef int (*read_func)(struct seq_file *s, void *data);
+
 /* This struct defines the operation on the handle.
  *
  * init_ae_dev(): (mandatory)
@@ -580,8 +587,6 @@ struct hnae3_ae_dev {
  *   Delete clsflower rule
  * cls_flower_active
  *   Check if any cls flower rule exist
- * dbg_read_cmd
- *   Execute debugfs read command.
  * set_tx_hwts_info
  *   Save information for 1588 tx packet
  * get_rx_hwts
@@ -594,6 +599,8 @@ struct hnae3_ae_dev {
  *   Get wake on lan info
  * set_wol
  *   Config wake on lan
+ * dbg_get_read_func
+ *   Return the read func for debugfs seq file
  */
 struct hnae3_ae_ops {
 	int (*init_ae_dev)(struct hnae3_ae_dev *ae_dev);
@@ -748,8 +755,6 @@ struct hnae3_ae_ops {
 	void (*enable_fd)(struct hnae3_handle *handle, bool enable);
 	int (*add_arfs_entry)(struct hnae3_handle *handle, u16 queue_id,
 			      u16 flow_id, struct flow_keys *fkeys);
-	int (*dbg_read_cmd)(struct hnae3_handle *handle, enum hnae3_dbg_cmd cmd,
-			    char *buf, int len);
 	pci_ers_result_t (*handle_hw_ras_error)(struct hnae3_ae_dev *ae_dev);
 	bool (*get_hw_reset_stat)(struct hnae3_handle *handle);
 	bool (*ae_dev_resetting)(struct hnae3_handle *handle);
@@ -796,6 +801,9 @@ struct hnae3_ae_ops {
 			struct ethtool_wolinfo *wol);
 	int (*set_wol)(struct hnae3_handle *handle,
 		       struct ethtool_wolinfo *wol);
+	int (*dbg_get_read_func)(struct hnae3_handle *handle,
+				 enum hnae3_dbg_cmd cmd,
+				 read_func *func);
 };
 
 struct hnae3_dcb_ops {