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Message-Id: <20231220014747.1508581-3-dw@davidwei.uk>
Date: Tue, 19 Dec 2023 17:47:44 -0800
From: David Wei <dw@...idwei.uk>
To: Jakub Kicinski <kuba@...nel.org>,
Jiri Pirko <jiri@...nulli.us>,
Sabrina Dubroca <sd@...asysnail.net>,
netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next v4 2/5] netdevsim: allow two netdevsim ports to be connected
Add a debugfs file in
/sys/kernel/debug/netdevsim/netdevsimN/ports/A/peer
Writing "M B" to this file will link port A of netdevsim N with port B
of netdevsim M. Reading this file will return the linked netdevsim id
and port, if any.
nsim_dev_list_lock and rtnl_lock are held during read/write of peer to
prevent concurrent modification of netdevsims or their ports.
Signed-off-by: David Wei <dw@...idwei.uk>
---
drivers/net/netdevsim/dev.c | 127 +++++++++++++++++++++++++++---
drivers/net/netdevsim/netdev.c | 6 ++
drivers/net/netdevsim/netdevsim.h | 1 +
3 files changed, 121 insertions(+), 13 deletions(-)
diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index e30a12130e07..e4621861c70b 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -391,6 +391,117 @@ static const struct file_operations nsim_dev_rate_parent_fops = {
.owner = THIS_MODULE,
};
+static struct nsim_dev *nsim_dev_find_by_id(unsigned int id)
+{
+ struct nsim_dev *dev;
+
+ list_for_each_entry(dev, &nsim_dev_list, list)
+ if (dev->nsim_bus_dev->dev.id == id)
+ return dev;
+
+ return NULL;
+}
+
+static struct nsim_dev_port *
+__nsim_dev_port_lookup(struct nsim_dev *nsim_dev, enum nsim_dev_port_type type,
+ unsigned int port_index)
+{
+ struct nsim_dev_port *nsim_dev_port;
+
+ port_index = nsim_dev_port_index(type, port_index);
+ list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list)
+ if (nsim_dev_port->port_index == port_index)
+ return nsim_dev_port;
+ return NULL;
+}
+
+static ssize_t nsim_dev_peer_read(struct file *file, char __user *data,
+ size_t count, loff_t *ppos)
+{
+ struct nsim_dev_port *nsim_dev_port;
+ struct netdevsim *peer;
+ unsigned int id, port;
+ char buf[23];
+ ssize_t ret;
+
+ mutex_lock(&nsim_dev_list_lock);
+ rtnl_lock();
+ nsim_dev_port = file->private_data;
+ peer = rtnl_dereference(nsim_dev_port->ns->peer);
+ if (!peer)
+ goto out;
+
+ id = peer->nsim_bus_dev->dev.id;
+ port = peer->nsim_dev_port->port_index;
+ ret = scnprintf(buf, sizeof(buf), "%u %u\n", id, port);
+ ret = simple_read_from_buffer(data, count, ppos, buf, ret);
+
+out:
+ rtnl_unlock();
+ mutex_unlock(&nsim_dev_list_lock);
+
+ return ret;
+}
+
+static ssize_t nsim_dev_peer_write(struct file *file,
+ const char __user *data,
+ size_t count, loff_t *ppos)
+{
+ struct nsim_dev_port *nsim_dev_port, *peer_dev_port;
+ struct nsim_dev *peer_dev;
+ unsigned int id, port;
+ char buf[22];
+ ssize_t ret;
+
+ if (count >= sizeof(buf))
+ return -ENOSPC;
+
+ ret = copy_from_user(buf, data, count);
+ if (ret)
+ return -EFAULT;
+ buf[count] = '\0';
+
+ ret = sscanf(buf, "%u %u", &id, &port);
+ if (ret != 2) {
+ pr_err("Format for adding a peer is \"id port\" (uint uint)");
+ return -EINVAL;
+ }
+
+ ret = -EINVAL;
+ mutex_lock(&nsim_dev_list_lock);
+ rtnl_lock();
+ peer_dev = nsim_dev_find_by_id(id);
+ if (!peer_dev)
+ goto out;
+
+ peer_dev_port = __nsim_dev_port_lookup(peer_dev, NSIM_DEV_PORT_TYPE_PF,
+ port);
+ if (!peer_dev_port)
+ goto out;
+
+ nsim_dev_port = file->private_data;
+ if (nsim_dev_port == peer_dev_port)
+ goto out;
+
+ rcu_assign_pointer(nsim_dev_port->ns->peer, peer_dev_port->ns);
+ rcu_assign_pointer(peer_dev_port->ns->peer, nsim_dev_port->ns);
+ ret = count;
+
+out:
+ rtnl_unlock();
+ mutex_unlock(&nsim_dev_list_lock);
+
+ return ret;
+}
+
+static const struct file_operations nsim_dev_peer_fops = {
+ .open = simple_open,
+ .read = nsim_dev_peer_read,
+ .write = nsim_dev_peer_write,
+ .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)
{
@@ -421,6 +532,9 @@ static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
}
debugfs_create_symlink("dev", nsim_dev_port->ddir, dev_link_name);
+ debugfs_create_file("peer", 0600, nsim_dev_port->ddir,
+ nsim_dev_port, &nsim_dev_peer_fops);
+
return 0;
}
@@ -1702,19 +1816,6 @@ void nsim_drv_remove(struct nsim_bus_dev *nsim_bus_dev)
dev_set_drvdata(&nsim_bus_dev->dev, NULL);
}
-static struct nsim_dev_port *
-__nsim_dev_port_lookup(struct nsim_dev *nsim_dev, enum nsim_dev_port_type type,
- unsigned int port_index)
-{
- struct nsim_dev_port *nsim_dev_port;
-
- port_index = nsim_dev_port_index(type, port_index);
- list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list)
- if (nsim_dev_port->port_index == port_index)
- return nsim_dev_port;
- return NULL;
-}
-
int nsim_drv_port_add(struct nsim_bus_dev *nsim_bus_dev, enum nsim_dev_port_type type,
unsigned int port_index)
{
diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index aecaf5f44374..434322f6a565 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -388,6 +388,7 @@ nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port)
ns->nsim_dev = nsim_dev;
ns->nsim_dev_port = nsim_dev_port;
ns->nsim_bus_dev = nsim_dev->nsim_bus_dev;
+ RCU_INIT_POINTER(ns->peer, NULL);
SET_NETDEV_DEV(dev, &ns->nsim_bus_dev->dev);
SET_NETDEV_DEVLINK_PORT(dev, &nsim_dev_port->devlink_port);
nsim_ethtool_init(ns);
@@ -407,8 +408,13 @@ nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port)
void nsim_destroy(struct netdevsim *ns)
{
struct net_device *dev = ns->netdev;
+ struct netdevsim *peer;
rtnl_lock();
+ peer = rtnl_dereference(ns->peer);
+ if (peer)
+ RCU_INIT_POINTER(peer->peer, NULL);
+ RCU_INIT_POINTER(ns->peer, NULL);
unregister_netdevice(dev);
if (nsim_dev_port_is_pf(ns->nsim_dev_port)) {
nsim_macsec_teardown(ns);
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index babb61d7790b..24fc3fbda791 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -125,6 +125,7 @@ struct netdevsim {
} udp_ports;
struct nsim_ethtool ethtool;
+ struct netdevsim __rcu *peer;
};
struct netdevsim *
--
2.39.3
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