netdev - Re: [PATCHv3 net-next 3/4] sctp: add support for generating stream reconf add incoming/outgoing streams request chunk

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Date:   Sun, 29 Jan 2017 12:31:17 -0200
From:   marcelo.leitner@...il.com
To:     David Miller <davem@...emloft.net>
Cc:     David.Laight@...LAB.COM, lucien.xin@...il.com,
        netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        nhorman@...driver.com, vyasevich@...il.com
Subject: Re: [PATCHv3 net-next 3/4] sctp: add support for generating stream
 reconf add incoming/outgoing streams request chunk

On Mon, Jan 23, 2017 at 10:58:10AM -0500, David Miller wrote:
> If this is "so critical" for end to end communication, why the heck
> do you not see __packed sprinkled all over our definitions for IPV4,
> IPV6, TCP, UDP, etc. headers?
> 
> Do you know why?  Because it's completely unnecessary...

Btw, virtually all sctp headers are currently tagged with __packed,
since forever.

$ git grep __packed -- include/linux/sctp.h
include/linux/sctp.h:} __packed sctp_sctphdr_t;
include/linux/sctp.h:} __packed sctp_chunkhdr_t;
include/linux/sctp.h:} __packed sctp_paramhdr_t;
include/linux/sctp.h:} __packed sctp_datahdr_t;
include/linux/sctp.h:} __packed sctp_data_chunk_t;
include/linux/sctp.h:} __packed sctp_inithdr_t;
include/linux/sctp.h:} __packed sctp_init_chunk_t;
include/linux/sctp.h:} __packed sctp_ipv4addr_param_t;
include/linux/sctp.h:} __packed sctp_ipv6addr_param_t;
include/linux/sctp.h:} __packed sctp_cookie_preserve_param_t;
include/linux/sctp.h:} __packed sctp_hostname_param_t;
include/linux/sctp.h:} __packed sctp_supported_addrs_param_t;
include/linux/sctp.h:} __packed sctp_ecn_capable_param_t;
include/linux/sctp.h:} __packed sctp_adaptation_ind_param_t;
include/linux/sctp.h:} __packed sctp_supported_ext_param_t;
include/linux/sctp.h:} __packed sctp_random_param_t;
include/linux/sctp.h:} __packed sctp_chunks_param_t;
include/linux/sctp.h:} __packed sctp_hmac_algo_param_t;
include/linux/sctp.h:} __packed sctp_cookie_param_t;
include/linux/sctp.h:} __packed sctp_unrecognized_param_t;
include/linux/sctp.h:} __packed sctp_gap_ack_block_t;
include/linux/sctp.h:} __packed sctp_sackhdr_t;
include/linux/sctp.h:} __packed sctp_sack_chunk_t;
include/linux/sctp.h:} __packed sctp_heartbeathdr_t;
include/linux/sctp.h:} __packed sctp_heartbeat_chunk_t;
include/linux/sctp.h:} __packed sctp_abort_chunk_t;
include/linux/sctp.h:} __packed sctp_shutdownhdr_t;
include/linux/sctp.h:} __packed;
include/linux/sctp.h:} __packed sctp_errhdr_t;
include/linux/sctp.h:} __packed sctp_operr_chunk_t;
include/linux/sctp.h:} __packed sctp_ecne_chunk_t;
include/linux/sctp.h:} __packed sctp_cwr_chunk_t;
...

^1da177e4c3f4 (Linus Torvalds           2005-04-16 15:20:36 -0700  64) }
__attribute__((packed)) sctp_sctphdr_t;

I'm reviewing them all and will probably post a patch to remove them.

  Marcelo