On Thu, Jul 23, 2020 at 11:22:38AM +0200, Christoph Hellwig wrote:
> On Wed, Jul 22, 2020 at 05:42:31PM -0300, Marcelo Ricardo Leitner wrote:
> > Cc'ing linux-s...@vger.kernel.org.
>
> What do you think of this version, which I think is a little cleaner?
It splits up the argument parsing from the actual handling, ok. Looks
good. Just one point:
> +static int sctp_setsockopt_delayed_ack(struct sock *sk,
> + struct sctp_sack_info *params,
> + unsigned int optlen)
> +{
> + if (optlen == sizeof(struct sctp_assoc_value)) {
> + struct sctp_sack_info p;
> +
> + pr_warn_ratelimited(DEPRECATED
> + "%s (pid %d) "
> + "Use of struct sctp_assoc_value in
> delayed_ack socket option.\n"
> + "Use struct sctp_sack_info instead\n",
> + current->comm, task_pid_nr(current));
> +
> + memcpy(&p, params, sizeof(struct sctp_assoc_value));
> + p.sack_freq = p.sack_delay ? 0 : 1;
Please add a comment saying that sctp_sack_info.sack_delay maps
exactly to sctp_assoc_value.assoc_value, so that's why we can do
memcpy and read assoc_value as sack_delay. I think it will help us not
trip on this again in the future.
> + return __sctp_setsockopt_delayed_ack(sk, &p);
> + }
> +
> + if (optlen != sizeof(struct sctp_sack_info))
> + return -EINVAL;
> + if (params->sack_delay == 0 && params->sack_freq == 0)
> + return 0;
> + return __sctp_setsockopt_delayed_ack(sk, params);
> +}
> +
> /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
> *
> * Applications can specify protocol parameters for the default association
