From 9864cfacf77fccb839abcb3873ee3ed0ec2891fa Mon Sep 17 00:00:00 2001 From: Dmytro Linkin Date: Wed, 2 Jun 2021 15:17:29 +0300 Subject: [PATCH] netdevsim: Allow setting parent node of rate objects 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 Signed-off-by: Vlad Buslov Signed-off-by: Dmytro Linkin Reviewed-by: Jiri Pirko Signed-off-by: David S. Miller --- 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 9f01b6c04cfdd..527b019ae0b2d 100644 --- a/drivers/net/netdevsim/dev.c +++ b/drivers/net/netdevsim/dev.c @@ -222,6 +222,7 @@ static const struct file_operations nsim_dev_max_vfs_fops = { 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); @@ -1068,6 +1102,8 @@ 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; }; @@ -1105,6 +1141,7 @@ 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."); @@ -1117,13 +1154,28 @@ 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, @@ -1131,11 +1183,40 @@ 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, @@ -1157,6 +1238,8 @@ static const struct devlink_ops nsim_dev_devlink_ops = { .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 d62a1386f9f1d..cdfdf2a995780 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; }; -- 2.39.5