netdev - Re: [PATCH v2 net-next 6/9] l2tp: use get_next APIs for management requests and procfs/debugfs

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Message-ID: <6730f50c-929d-aaed-0282-60eb321f8679@katalix.com>
Date: Mon, 12 Aug 2024 09:14:42 +0100
From: James Chapman <jchapman@...alix.com>
To: Cong Wang <xiyou.wangcong@...il.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, dsahern@...nel.org, tparkin@...alix.com,
 horms@...nel.org
Subject: Re: [PATCH v2 net-next 6/9] l2tp: use get_next APIs for management
 requests and procfs/debugfs

On 11/08/2024 19:36, Cong Wang wrote:
> On Wed, Aug 07, 2024 at 07:54:49AM +0100, James Chapman wrote:
>> diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h
>> index cc464982a7d9..0fabacffc3f3 100644
>> --- a/net/l2tp/l2tp_core.h
>> +++ b/net/l2tp/l2tp_core.h
>> @@ -219,14 +219,12 @@ void l2tp_session_dec_refcount(struct l2tp_session *session);
>>    * the caller must ensure that the reference is dropped appropriately.
>>    */
>>   struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id);
>> -struct l2tp_tunnel *l2tp_tunnel_get_nth(const struct net *net, int nth);
>>   struct l2tp_tunnel *l2tp_tunnel_get_next(const struct net *net, unsigned long *key);
>>   
>>   struct l2tp_session *l2tp_v3_session_get(const struct net *net, struct sock *sk, u32 session_id);
>>   struct l2tp_session *l2tp_v2_session_get(const struct net *net, u16 tunnel_id, u16 session_id);
>>   struct l2tp_session *l2tp_session_get(const struct net *net, struct sock *sk, int pver,
>>   				      u32 tunnel_id, u32 session_id);
>> -struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth);
>>   struct l2tp_session *l2tp_session_get_next(const struct net *net, struct sock *sk, int pver,
>>   					   u32 tunnel_id, unsigned long *key);
>>   struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net,
>> diff --git a/net/l2tp/l2tp_debugfs.c b/net/l2tp/l2tp_debugfs.c
>> index 8755ae521154..b2134b57ed18 100644
>> --- a/net/l2tp/l2tp_debugfs.c
>> +++ b/net/l2tp/l2tp_debugfs.c
>> @@ -34,8 +34,8 @@ static struct dentry *rootdir;
>>   struct l2tp_dfs_seq_data {
>>   	struct net	*net;
>>   	netns_tracker	ns_tracker;
>> -	int tunnel_idx;			/* current tunnel */
>> -	int session_idx;		/* index of session within current tunnel */
>> +	unsigned long tkey;		/* lookup key of current tunnel */
>> +	unsigned long skey;		/* lookup key of current session */
> 
> Any reason to change the type from int to unsigned long?
> 
> Asking because tunnel ID remains to be 32bit unsigned int as a part of
> UAPI.
> 
> Thanks.

It's used as the key in and potentially modified by idr_get_next_ul calls.