net: hns3: add debugfs support for tm nodes, priority and qset info

In order to query tm info of nodes, priority and qset
for debugging, adds three debugfs files tm_nodes,
tm_priority and tm_qset in newly created tm directory.

Unlike previous debugfs commands, these three files
just support read ops, so they only support to use cat
command to dump their info.

The new tm file style is acccording to suggestion from
Jakub Kicinski's opinion as link https://lkml.org/lkml/2020/9/29/2101.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 54 insertions, 1 deletions

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
index 9d4e9c053a8f..6978304f1ac5 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
@@ -7,7 +7,7 @@
 #include "hnae3.h"
 #include "hns3_enet.h"
 
-#define HNS3_DBG_READ_LEN 256
+#define HNS3_DBG_READ_LEN 65536
 #define HNS3_DBG_WRITE_LEN 1024
 
 static struct dentry *hns3_dbgfs_root;
@@ -484,6 +484,42 @@ static ssize_t hns3_dbg_cmd_write(struct file *filp, const char __user *buffer,
 	return count;
 }
 
+static ssize_t hns3_dbg_read(struct file *filp, char __user *buffer,
+			     size_t count, loff_t *ppos)
+{
+	struct hnae3_handle *handle = filp->private_data;
+	const struct hnae3_ae_ops *ops = handle->ae_algo->ops;
+	struct hns3_nic_priv *priv = handle->priv;
+	char *cmd_buf, *read_buf;
+	ssize_t size = 0;
+	int ret = 0;
+
+	if (!filp->f_path.dentry->d_iname)
+		return -EINVAL;
+
+	read_buf = kzalloc(HNS3_DBG_READ_LEN, GFP_KERNEL);
+	if (!read_buf)
+		return -ENOMEM;
+
+	cmd_buf = filp->f_path.dentry->d_iname;
+
+	if (ops->dbg_read_cmd)
+		ret = ops->dbg_read_cmd(handle, cmd_buf, read_buf,
+					HNS3_DBG_READ_LEN);
+
+	if (ret) {
+		dev_info(priv->dev, "unknown command\n");
+		goto out;
+	}
+
+	size = simple_read_from_buffer(buffer, count, ppos, read_buf,
+				       strlen(read_buf));
+
+out:
+	kfree(read_buf);
+	return size;
+}
+
 static const struct file_operations hns3_dbg_cmd_fops = {
 	.owner = THIS_MODULE,
 	.open  = simple_open,
@@ -491,14 +527,31 @@ static const struct file_operations hns3_dbg_cmd_fops = {
 	.write = hns3_dbg_cmd_write,
 };
 
+static const struct file_operations hns3_dbg_fops = {
+	.owner = THIS_MODULE,
+	.open  = simple_open,
+	.read  = hns3_dbg_read,
+};
+
 void hns3_dbg_init(struct hnae3_handle *handle)
 {
+	struct hnae3_ae_dev *ae_dev = pci_get_drvdata(handle->pdev);
 	const char *name = pci_name(handle->pdev);
+	struct dentry *entry_dir;
 
 	handle->hnae3_dbgfs = debugfs_create_dir(name, hns3_dbgfs_root);
 
 	debugfs_create_file("cmd", 0600, handle->hnae3_dbgfs, handle,
 			    &hns3_dbg_cmd_fops);
+
+	entry_dir = debugfs_create_dir("tm", handle->hnae3_dbgfs);
+	if (ae_dev->dev_version > HNAE3_DEVICE_VERSION_V2)
+		debugfs_create_file(HNAE3_DBG_TM_NODES, 0600, entry_dir, handle,
+				    &hns3_dbg_fops);
+	debugfs_create_file(HNAE3_DBG_TM_PRI, 0600, entry_dir, handle,
+			    &hns3_dbg_fops);
+	debugfs_create_file(HNAE3_DBG_TM_QSET, 0600, entry_dir, handle,
+			    &hns3_dbg_fops);
 }
 
 void hns3_dbg_uninit(struct hnae3_handle *handle)