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:   Fri, 20 Jan 2017 14:50:01 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Xin Long' <lucien.xin@...il.com>,
        network dev <netdev@...r.kernel.org>,
        "linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>
CC:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Vlad Yasevich <vyasevich@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: RE: [PATCHv3 net-next 3/4] sctp: add support for generating stream
 reconf add incoming/outgoing streams request chunk

From: Xin Long
> Sent: 19 January 2017 17:19
> This patch is to define Add Incoming/Outgoing Streams Request
> Parameter described in rfc6525 section 4.5 and 4.6. They can
> be in one same chunk trunk as rfc6525 section 3.1-7 describes,
> so make them in one function.
...
> +struct sctp_strreset_addstrm {
> +	sctp_paramhdr_t param_hdr;
> +	__u32 request_seq;
> +	__u16 number_of_streams;
> +	__u16 reserved;
> +} __packed;
...
> +		addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;
> +		addstrm.param_hdr.length = htons(size);
> +		addstrm.number_of_streams = htons(out);
> +		addstrm.request_seq = htonl(asoc->strreset_outseq);
> +		addstrm.reserved = 0;
> +
> +		sctp_addto_chunk(retval, size, &addstrm);

Since you allocate the sctp_strreset_addstrm structure on stack
there is no requirement for it to be packed.

	David