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

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Date: Wed, 3 Jan 2024 13:48:47 -0800
From: David Wei <dw@...idwei.uk>
To: Jiri Pirko <jiri@...nulli.us>
Cc: Jakub Kicinski <kuba@...nel.org>, Sabrina Dubroca <sd@...asysnail.net>,
 netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next v5 1/5] netdevsim: maintain a list of probed
 netdevsims

On 2024-01-02 03:04, Jiri Pirko wrote:
> Thu, Dec 28, 2023 at 02:46:29AM CET, dw@...idwei.uk wrote:
>> 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);
> 
> This is just:
> 	mutex_lock(&nsim_dev_list_lock);
> 	list_del(&nsim_dev->list);
> 	mutex_unlock(&nsim_dev_list_lock);
> 
> The loop is not good for anything.

Thanks, will fix this.

> 
> 
> 
>>
>> 	devl_lock(devlink);
>> +
> 
> Remove this leftover line addition.

Ditto.

> 
> 
>> 	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
>>