netdev - [patch net-next RFC 09/10] netdevsim: implement line card activation

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Message-Id: <20210113121222.733517-10-jiri@resnulli.us>
Date:   Wed, 13 Jan 2021 13:12:21 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, jacob.e.keller@...el.com,
        roopa@...dia.com, mlxsw@...dia.com
Subject: [patch net-next RFC 09/10] netdevsim: implement line card activation

From: Jiri Pirko <jiri@...dia.com>

On real HW, the activation typically happens upon line card insertion.
Emulate such event using write to debugfs file "active".

Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
 drivers/net/netdevsim/dev.c | 81 +++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)

diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index 9e9a2a75ddf8..81d68269e121 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -64,6 +64,30 @@ nsim_dev_port_index(struct nsim_dev_linecard *nsim_dev_linecard,
 	       port_index;
 }
 
+static int
+nsim_dev_linecard_activate(struct nsim_dev_linecard *nsim_dev_linecard)
+{
+	struct nsim_dev_port *nsim_dev_port;
+
+	list_for_each_entry(nsim_dev_port, &nsim_dev_linecard->port_list,
+			    list_lc)
+		netif_carrier_on(nsim_dev_port->ns->netdev);
+
+	devlink_linecard_activate(nsim_dev_linecard->devlink_linecard);
+	return 0;
+}
+
+static void
+nsim_dev_linecard_deactivate(struct nsim_dev_linecard *nsim_dev_linecard)
+{
+	struct nsim_dev_port *nsim_dev_port;
+
+	list_for_each_entry(nsim_dev_port, &nsim_dev_linecard->port_list,
+			    list_lc)
+		netif_carrier_off(nsim_dev_port->ns->netdev);
+	devlink_linecard_deactivate(nsim_dev_linecard->devlink_linecard);
+}
+
 static struct dentry *nsim_dev_ddir;
 
 #define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32)
@@ -299,6 +323,61 @@ static void nsim_dev_port_debugfs_exit(struct nsim_dev_port *nsim_dev_port)
 	debugfs_remove_recursive(nsim_dev_port->ddir);
 }
 
+static ssize_t nsim_dev_linecard_active_read(struct file *file,
+					     char __user *data,
+					     size_t count, loff_t *ppos)
+{
+	struct nsim_dev_linecard *nsim_dev_linecard = file->private_data;
+	char buf[3];
+
+	if (!nsim_dev_linecard->provisioned)
+		return -EOPNOTSUPP;
+
+	if (devlink_linecard_is_active(nsim_dev_linecard->devlink_linecard))
+		buf[0] = 'Y';
+	else
+		buf[0] = 'N';
+	buf[1] = '\n';
+	buf[2] = 0x00;
+	return simple_read_from_buffer(data, count, ppos, buf, strlen(buf));
+}
+
+static ssize_t nsim_dev_linecard_active_write(struct file *file,
+					      const char __user *data,
+					      size_t count, loff_t *ppos)
+{
+	struct nsim_dev_linecard *nsim_dev_linecard = file->private_data;
+	bool active;
+	bool bv;
+	int err;
+	int r;
+
+	if (!nsim_dev_linecard->provisioned)
+		return -EOPNOTSUPP;
+
+	active = devlink_linecard_is_active(nsim_dev_linecard->devlink_linecard);
+
+	r = kstrtobool_from_user(data, count, &bv);
+	if (!r && active != bv) {
+		if (bv) {
+			err = nsim_dev_linecard_activate(nsim_dev_linecard);
+			if (err)
+				return err;
+		} else {
+			nsim_dev_linecard_deactivate(nsim_dev_linecard);
+		}
+	}
+	return count;
+}
+
+static const struct file_operations nsim_dev_linecard_active_fops = {
+	.open = simple_open,
+	.read = nsim_dev_linecard_active_read,
+	.write = nsim_dev_linecard_active_write,
+	.llseek = generic_file_llseek,
+	.owner = THIS_MODULE,
+};
+
 static ssize_t nsim_dev_linecard_type_read(struct file *file, char __user *data,
 					   size_t count, loff_t *ppos)
 {
@@ -334,6 +413,8 @@ nsim_dev_linecard_debugfs_init(struct nsim_dev *nsim_dev,
 	sprintf(dev_link_name, "../../../" DRV_NAME "%u",
 		nsim_dev->nsim_bus_dev->dev.id);
 	debugfs_create_symlink("dev", nsim_dev_linecard->ddir, dev_link_name);
+	debugfs_create_file("active", 0600, nsim_dev_linecard->ddir,
+			    nsim_dev_linecard, &nsim_dev_linecard_active_fops);
 	debugfs_create_file("type", 0400, nsim_dev_linecard->ddir,
 			    nsim_dev_linecard, &nsim_dev_linecard_type_fops);
 
-- 
2.26.2