netdev - Re: [PATCH net-next 1/2] net/sctp: Make wrappers for accessing in/out streams

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Message-ID: <ee5a2c25-53a2-6d85-0adf-9e329e22e134@virtuozzo.com>
Date:   Fri, 27 Apr 2018 01:19:04 +0300
From:   Oleg Babin <obabin@...tuozzo.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Xin Long <lucien.xin@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: Re: [PATCH net-next 1/2] net/sctp: Make wrappers for accessing in/out
 streams

On 04/24/2018 12:33 AM, Marcelo Ricardo Leitner wrote:
> On Mon, Apr 23, 2018 at 09:41:05PM +0300, Oleg Babin wrote:
>> This patch introduces wrappers for accessing in/out streams indirectly.
>> This will enable to replace physically contiguous memory arrays
>> of streams with flexible arrays (or maybe any other appropriate
>> mechanism) which do memory allocation on a per-page basis.
>>
>> Signed-off-by: Oleg Babin <obabin@...tuozzo.com>
>> ---
>>  include/net/sctp/structs.h   |  30 +++++++-----
>>  net/sctp/chunk.c             |   6 ++-
>>  net/sctp/outqueue.c          |  11 +++--
>>  net/sctp/socket.c            |   4 +-
>>  net/sctp/stream.c            | 107 +++++++++++++++++++++++++------------------
>>  net/sctp/stream_interleave.c |   2 +-
>>  net/sctp/stream_sched.c      |  13 +++---
>>  net/sctp/stream_sched_prio.c |  22 ++++-----
>>  net/sctp/stream_sched_rr.c   |   8 ++--
>>  9 files changed, 116 insertions(+), 87 deletions(-)
>>
>> diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
>> index a0ec462..578bb40 100644
>> --- a/include/net/sctp/structs.h
>> +++ b/include/net/sctp/structs.h
>> @@ -394,37 +394,37 @@ int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
>>
>>  /* What is the current SSN number for this stream? */
>>  #define sctp_ssn_peek(stream, type, sid) \
>> -	((stream)->type[sid].ssn)
>> +	(sctp_stream_##type##_ptr((stream), (sid))->ssn)
>>
>>  /* Return the next SSN number for this stream.	*/
>>  #define sctp_ssn_next(stream, type, sid) \
>> -	((stream)->type[sid].ssn++)
>> +	(sctp_stream_##type##_ptr((stream), (sid))->ssn++)
>>
>>  /* Skip over this ssn and all below. */
>>  #define sctp_ssn_skip(stream, type, sid, ssn) \
>> -	((stream)->type[sid].ssn = ssn + 1)
>> +	(sctp_stream_##type##_ptr((stream), (sid))->ssn = ssn + 1)
>>
>>  /* What is the current MID number for this stream? */
>>  #define sctp_mid_peek(stream, type, sid) \
>> -	((stream)->type[sid].mid)
>> +	(sctp_stream_##type##_ptr((stream), (sid))->mid)
>>
>>  /* Return the next MID number for this stream.  */
>>  #define sctp_mid_next(stream, type, sid) \
>> -	((stream)->type[sid].mid++)
>> +	(sctp_stream_##type##_ptr((stream), (sid))->mid++)
>>
>>  /* Skip over this mid and all below. */
>>  #define sctp_mid_skip(stream, type, sid, mid) \
>> -	((stream)->type[sid].mid = mid + 1)
>> +	(sctp_stream_##type##_ptr((stream), (sid))->mid = mid + 1)
>>
>> -#define sctp_stream_in(asoc, sid) (&(asoc)->stream.in[sid])
>> +#define sctp_stream_in(asoc, sid) sctp_stream_in_ptr(&(asoc)->stream, (sid))
> 
> This will get confusing:
> - sctp_stream_in(asoc, sid)
> - sctp_stream_in_ptr(stream, sid)
> 
> Considering all usages of sctp_stream_in(), seems you can just update
> them to do the ->stream deref and keep only the later implementation.
> Which then don't need the _ptr suffix.
Ok, I'll change that in the next path version.

-- 
Best regards,
Oleg Babin