netdev - [PATCH net-next v5 1/5] netdevsim: maintain a list of probed netdevsims

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Date: Wed, 27 Dec 2023 17:46:29 -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 v5 1/5] netdevsim: maintain a list of probed netdevsims

In this patch I added a linked list nsim_dev_list of probed nsim_devs,
added during nsim_drv_probe() and removed during nsim_drv_remove(). A
mutex nsim_dev_list_lock protects the list.

Signed-off-by: David Wei <dw@...idwei.uk>
---
 drivers/net/netdevsim/dev.c       | 19 +++++++++++++++++++
 drivers/net/netdevsim/netdevsim.h |  1 +
 2 files changed, 20 insertions(+)

diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index b4d3b9cde8bd..8d477aa99f94 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -35,6 +35,9 @@
 
 #include "netdevsim.h"
 
+static LIST_HEAD(nsim_dev_list);
+static DEFINE_MUTEX(nsim_dev_list_lock);
+
 static unsigned int
 nsim_dev_port_index(enum nsim_dev_port_type type, unsigned int port_index)
 {
@@ -1607,6 +1610,11 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 
 	nsim_dev->esw_mode = DEVLINK_ESWITCH_MODE_LEGACY;
 	devl_unlock(devlink);
+
+	mutex_lock(&nsim_dev_list_lock);
+	list_add(&nsim_dev->list, &nsim_dev_list);
+	mutex_unlock(&nsim_dev_list_lock);
+
 	return 0;
 
 err_hwstats_exit:
@@ -1668,8 +1676,19 @@ void nsim_drv_remove(struct nsim_bus_dev *nsim_bus_dev)
 {
 	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 	struct devlink *devlink = priv_to_devlink(nsim_dev);
+	struct nsim_dev *pos, *tmp;
+
+	mutex_lock(&nsim_dev_list_lock);
+	list_for_each_entry_safe(pos, tmp, &nsim_dev_list, list) {
+		if (pos == nsim_dev) {
+			list_del(&nsim_dev->list);
+			break;
+		}
+	}
+	mutex_unlock(&nsim_dev_list_lock);
 
 	devl_lock(devlink);
+
 	nsim_dev_reload_destroy(nsim_dev);
 
 	nsim_bpf_dev_exit(nsim_dev);
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index 028c825b86db..babb61d7790b 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -277,6 +277,7 @@ struct nsim_vf_config {
 
 struct nsim_dev {
 	struct nsim_bus_dev *nsim_bus_dev;
+	struct list_head list;
 	struct nsim_fib_data *fib_data;
 	struct nsim_trap_data *trap_data;
 	struct dentry *ddir;
-- 
2.39.3