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Message-ID: <1620830927-11828-17-git-send-email-dlinkin@nvidia.com>
Date: Wed, 12 May 2021 17:48:45 +0300
From: <dlinkin@...dia.com>
To: <netdev@...r.kernel.org>
CC: <davem@...emloft.net>, <kuba@...nel.org>, <jiri@...dia.com>,
<stephen@...workplumber.org>, <dsahern@...il.com>,
<vladbu@...dia.com>, <parav@...dia.com>, <huyn@...dia.com>,
Dmytro Linkin <dlinkin@...dia.com>
Subject: [PATCH RFC net-next v2 16/18] netdevsim: Allow setting parent node of rate objects
From: Dmytro Linkin <dlinkin@...dia.com>
Implement new devlink ops that allow setting rate node as a parent for
devlink port (leaf) or another devlink node through devlink API.
Expose parent names to netdevsim debugfs in read only mode.
Co-developed-by: Vlad Buslov <vladbu@...dia.com>
Signed-off-by: Vlad Buslov <vladbu@...dia.com>
Signed-off-by: Dmytro Linkin <dlinkin@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
---
drivers/net/netdevsim/dev.c | 91 +++++++++++++++++++++++++++++++++++++--
drivers/net/netdevsim/netdevsim.h | 2 +
2 files changed, 89 insertions(+), 4 deletions(-)
diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index 0346457..bd1a823 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -222,6 +222,7 @@ static ssize_t nsim_dev_trap_fa_cookie_write(struct file *file,
static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
{
char dev_ddir_name[sizeof(DRV_NAME) + 10];
+ int err;
sprintf(dev_ddir_name, DRV_NAME "%u", nsim_dev->nsim_bus_dev->dev.id);
nsim_dev->ddir = debugfs_create_dir(dev_ddir_name, nsim_dev_ddir);
@@ -264,10 +265,17 @@ static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
nsim_dev->nsim_bus_dev,
&nsim_dev_max_vfs_fops);
nsim_dev->nodes_ddir = debugfs_create_dir("rate_nodes", nsim_dev->ddir);
- if (IS_ERR(nsim_dev->nodes_ddir))
- return PTR_ERR(nsim_dev->nodes_ddir);
+ if (IS_ERR(nsim_dev->nodes_ddir)) {
+ err = PTR_ERR(nsim_dev->nodes_ddir);
+ goto err_out;
+ }
nsim_udp_tunnels_debugfs_create(nsim_dev);
return 0;
+
+err_out:
+ debugfs_remove_recursive(nsim_dev->ports_ddir);
+ debugfs_remove_recursive(nsim_dev->ddir);
+ return err;
}
static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev)
@@ -277,6 +285,27 @@ static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev)
debugfs_remove_recursive(nsim_dev->ddir);
}
+static ssize_t nsim_dev_rate_parent_read(struct file *file,
+ char __user *data,
+ size_t count, loff_t *ppos)
+{
+ char **name_ptr = file->private_data;
+ size_t len;
+
+ if (!*name_ptr)
+ return 0;
+
+ len = strlen(*name_ptr);
+ return simple_read_from_buffer(data, count, ppos, *name_ptr, len);
+}
+
+static const struct file_operations nsim_dev_rate_parent_fops = {
+ .open = simple_open,
+ .read = nsim_dev_rate_parent_read,
+ .llseek = generic_file_llseek,
+ .owner = THIS_MODULE,
+};
+
static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
struct nsim_dev_port *nsim_dev_port)
{
@@ -299,6 +328,11 @@ static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
&nsim_bus_dev->vfconfigs[vf_id].min_tx_rate);
debugfs_create_u16("tx_max", 0400, nsim_dev_port->ddir,
&nsim_bus_dev->vfconfigs[vf_id].max_tx_rate);
+ nsim_dev_port->rate_parent = debugfs_create_file("rate_parent",
+ 0400,
+ nsim_dev_port->ddir,
+ &nsim_dev_port->parent_name,
+ &nsim_dev_rate_parent_fops);
}
debugfs_create_symlink("dev", nsim_dev_port->ddir, dev_link_name);
@@ -1066,6 +1100,8 @@ static int nsim_leaf_tx_max_set(struct devlink_rate *devlink_rate, void *priv,
struct nsim_rate_node {
struct dentry *ddir;
+ struct dentry *rate_parent;
+ char *parent_name;
u16 tx_share;
u16 tx_max;
};
@@ -1103,6 +1139,7 @@ static int nsim_rate_node_new(struct devlink_rate *node, void **priv,
{
struct nsim_dev *nsim_dev = devlink_priv(node->devlink);
struct nsim_rate_node *nsim_node;
+ int err;
if (!nsim_esw_mode_is_switchdev(nsim_dev)) {
NL_SET_ERR_MSG_MOD(extack, "Node creation allowed only in switchdev mode.");
@@ -1115,13 +1152,28 @@ static int nsim_rate_node_new(struct devlink_rate *node, void **priv,
nsim_node->ddir = debugfs_create_dir(node->name, nsim_dev->nodes_ddir);
if (!nsim_node->ddir) {
- kfree(nsim_node);
- return -ENOMEM;
+ err = -ENOMEM;
+ goto err_node;
}
debugfs_create_u16("tx_share", 0400, nsim_node->ddir, &nsim_node->tx_share);
debugfs_create_u16("tx_max", 0400, nsim_node->ddir, &nsim_node->tx_max);
+ nsim_node->rate_parent = debugfs_create_file("rate_parent", 0400,
+ nsim_node->ddir,
+ &nsim_node->parent_name,
+ &nsim_dev_rate_parent_fops);
+ if (IS_ERR(nsim_node->rate_parent)) {
+ err = PTR_ERR(nsim_node->rate_parent);
+ goto err_ddir;
+ }
+
*priv = nsim_node;
return 0;
+
+err_ddir:
+ debugfs_remove_recursive(nsim_node->ddir);
+err_node:
+ kfree(nsim_node);
+ return err;
}
static int nsim_rate_node_del(struct devlink_rate *node, void *priv,
@@ -1129,11 +1181,40 @@ static int nsim_rate_node_del(struct devlink_rate *node, void *priv,
{
struct nsim_rate_node *nsim_node = priv;
+ debugfs_remove(nsim_node->rate_parent);
debugfs_remove_recursive(nsim_node->ddir);
kfree(nsim_node);
return 0;
}
+static int nsim_rate_leaf_parent_set(struct devlink_rate *child,
+ struct devlink_rate *parent,
+ void *priv_child, void *priv_parent,
+ struct netlink_ext_ack *extack)
+{
+ struct nsim_dev_port *nsim_dev_port = priv_child;
+
+ if (parent)
+ nsim_dev_port->parent_name = parent->name;
+ else
+ nsim_dev_port->parent_name = NULL;
+ return 0;
+}
+
+static int nsim_rate_node_parent_set(struct devlink_rate *child,
+ struct devlink_rate *parent,
+ void *priv_child, void *priv_parent,
+ struct netlink_ext_ack *extack)
+{
+ struct nsim_rate_node *nsim_node = priv_child;
+
+ if (parent)
+ nsim_node->parent_name = parent->name;
+ else
+ nsim_node->parent_name = NULL;
+ return 0;
+}
+
static const struct devlink_ops nsim_dev_devlink_ops = {
.eswitch_mode_set = nsim_devlink_eswitch_mode_set,
.eswitch_mode_get = nsim_devlink_eswitch_mode_get,
@@ -1155,6 +1236,8 @@ static int nsim_rate_node_del(struct devlink_rate *node, void *priv,
.rate_node_tx_max_set = nsim_node_tx_max_set,
.rate_node_new = nsim_rate_node_new,
.rate_node_del = nsim_rate_node_del,
+ .rate_leaf_parent_set = nsim_rate_leaf_parent_set,
+ .rate_node_parent_set = nsim_rate_node_parent_set,
};
#define NSIM_DEV_MAX_MACS_DEFAULT 32
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index d62a138..cdfdf2a 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -211,6 +211,8 @@ struct nsim_dev_port {
unsigned int port_index;
enum nsim_dev_port_type port_type;
struct dentry *ddir;
+ struct dentry *rate_parent;
+ char *parent_name;
struct netdevsim *ns;
};
--
1.8.3.1
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