netdev - Re: [PATCH net-next v2 5/6] gtp: add socket to pdp context

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Date:   Thu, 2 Feb 2017 15:12:55 +0100 (CET)
From:   Andreas Schultz <aschultz@...p.net>
To:     pablo <pablo@...filter.org>
Cc:     netdev <netdev@...r.kernel.org>, laforge <laforge@...monks.org>,
        Lionel Gauthier <Lionel.Gauthier@...ecom.fr>,
        openbsc <openbsc@...ts.osmocom.org>
Subject: Re: [PATCH net-next v2 5/6] gtp: add socket to pdp context

Hi,

----- On Feb 2, 2017, at 2:56 PM, pablo pablo@...filter.org wrote:

> On Mon, Jan 30, 2017 at 05:37:12PM +0100, Andreas Schultz wrote:
>> Having the socket present in context simplifies the sending logic.
>> It also fixes the invalid assumption that we have to use the same
>> sending socket for all client IP's on a specific gtp interface.
>> 
>> Signed-off-by: Andreas Schultz <aschultz@...p.net>
>> ---
>>  drivers/net/gtp.c | 72 ++++++++++++++++++++++++++++++-------------------------
>>  1 file changed, 39 insertions(+), 33 deletions(-)
>> 
>> diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
>> index 68c6c9b..ff00597 100644
>> --- a/drivers/net/gtp.c
>> +++ b/drivers/net/gtp.c
> [...]
>> @@ -984,16 +966,26 @@ static int ipv4_pdp_add(struct gtp_dev *gtp, struct
>> genl_info *info)
>>  	return 0;
>>  }
>>  
>> +static void pdp_context_free(struct rcu_head *head)
>> +{
>> +	struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head);
>> +
>> +	sock_put(pctx->sk);
>> +	kfree(pctx);
>> +}
>> +
>>  static void pdp_context_delete(struct pdp_ctx *pctx)
>>  {
>>  	hlist_del_rcu(&pctx->hlist_tid);
>>  	hlist_del_rcu(&pctx->hlist_addr);
>> -	kfree(pctx);
>> +	call_rcu(&pctx->rcu_head, pdp_context_free);
> 
> This is fixing incorrect rcu conversion in 4/6. Please, fix this there.

Ehm, right, but the kfree in 4/6 could have been a kfree_rcu instead without
the call_rcu.

Do you prefer to introduce the call_rcu in 4/6 and then just add the sock_put
in this patch or should I change 4/6 to kfree_rcu and do the call_rcu
conversion here?

Andreas