Re: [PATCH 4/6] sctp multistream scheduling: extend socket API

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Yaogong Wang wrote:
> Augment SCTP socket API with a new socket option to choose and
> configure scheduling algorithm.
> 
> Signed-off-by: Yaogong Wang <ywang15@xxxxxxxx>
> ---
> diff -uprN -X linux-2.6.32.8/Documentation/dontdiff
> p3/include/net/sctp/structs.h p4/include/net/sctp/structs.h
> --- p3/include/net/sctp/structs.h	2010-06-02 12:57:24.000000000 -0700
> +++ p4/include/net/sctp/structs.h	2010-06-02 12:58:11.000000000 -0700
> @@ -326,6 +326,8 @@ struct sctp_sock {
> 
>  	/* Multistream scheduling  */
>  	const struct sctp_sched_ops *sched_ops;
> +	__u32 sched_priv_len;
> +	__u16 *sched_priv;
> 
>  	struct sctp_initmsg initmsg;
>  	struct sctp_rtoinfo rtoinfo;
> @@ -1691,6 +1693,8 @@ struct sctp_association {
> 
>  	/* Multistream scheduling  */
>  	const struct sctp_sched_ops *sched_ops;
> +	__u32 sched_priv_len;
> +	__u16 *sched_priv;
> 
>  	/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
>  	 * the destination address every heartbeat interval. This value
> diff -uprN -X linux-2.6.32.8/Documentation/dontdiff
> p3/include/net/sctp/user.h p4/include/net/sctp/user.h
> --- p3/include/net/sctp/user.h	2010-05-28 10:59:23.000000000 -0700
> +++ p4/include/net/sctp/user.h	2010-05-28 11:54:47.000000000 -0700
> @@ -67,6 +67,8 @@ enum sctp_optname {
>  #define SCTP_ASSOCINFO SCTP_ASSOCINFO
>  	SCTP_INITMSG,
>  #define SCTP_INITMSG SCTP_INITMSG
> +	SCTP_SCHED,
> +#define SCTP_SCHED SCTP_SCHED
>  	SCTP_NODELAY, 	/* Get/set nodelay option. */

You can't insert a new option into the middle.  This would change the ordering
of subsequent options and break the ABI.

>  #define SCTP_NODELAY	SCTP_NODELAY
>  	SCTP_AUTOCLOSE,
> @@ -171,8 +173,22 @@ struct sctp_initmsg {
>  	__u16 sinit_max_init_timeo;
>  };
> 
> +/*
> + * SCTP Scheduling Structure (SCTP_SCHED)
> + *
> + *   cmsg_level    cmsg_type      cmsg_data[]
> + *   ------------  ------------   ----------------------
> + *   IPPROTO_SCTP  SCTP_SCHED     struct sctp_sched
> + *
> + */
>  #define SCTP_SCHED_NAME_MAX	16
> 
> +struct sctp_sched {
> +	char  ssched_name[SCTP_SCHED_NAME_MAX];
> +	__u32 ssched_priv_len;
> +	__u16 ssched_priv[0];
> +};
> +

Don't document it as ancillary data since it can't be used as such.

Also, should this also have an assoc_id so that it can be set per
association?

>  /*
>   * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
>   *
> diff -uprN -X linux-2.6.32.8/Documentation/dontdiff
> p3/net/sctp/associola.c p4/net/sctp/associola.c
> --- p3/net/sctp/associola.c	2010-06-02 12:57:06.000000000 -0700
> +++ p4/net/sctp/associola.c	2010-06-02 12:57:57.000000000 -0700
> @@ -187,6 +187,14 @@ static struct sctp_association *sctp_ass
> 
>  	/* Multistream scheduling  */
>  	asoc->sched_ops = sp->sched_ops;
> +	asoc->sched_priv_len = sp->sched_priv_len;
> +	if (asoc->sched_priv_len) {
> +		asoc->sched_priv = kmalloc(asoc->sched_priv_len, gfp);
> +		if (!asoc->sched_priv)
> +			goto fail_init;
> +		memcpy(asoc->sched_priv, sp->sched_priv, asoc->sched_priv_len);

use kmemdup()

> +	} else
> +		asoc->sched_priv = NULL;
> 
>  	/* Allocate storage for the ssnmap after the inbound and outbound
>  	 * streams have been negotiated during Init.
> @@ -464,6 +472,8 @@ static void sctp_association_destroy(str
>  {
>  	SCTP_ASSERT(asoc->base.dead, "Assoc is not dead", return);
> 
> +	kfree(asoc->sched_priv);
> +
>  	sctp_endpoint_put(asoc->ep);
>  	sock_put(asoc->base.sk);
> 
> diff -uprN -X linux-2.6.32.8/Documentation/dontdiff
> p3/net/sctp/socket.c p4/net/sctp/socket.c
> --- p3/net/sctp/socket.c	2010-05-28 12:38:09.000000000 -0700
> +++ p4/net/sctp/socket.c	2010-05-28 12:36:37.000000000 -0700
> @@ -2580,6 +2580,50 @@ static int sctp_setsockopt_initmsg(struc
>  	return 0;
>  }
> 
> +/* Set the multistream scheduling algorithm*/
> +static int sctp_setsockopt_sched(struct sock *sk, char __user *optval,
> +						unsigned int optlen)
> +{
> +	struct sctp_sched *ssched = NULL;
> +	struct sctp_sock *sp = sctp_sk(sk);
> +	int ret = 0;
> +
> +	if (optlen < sizeof(struct sctp_sched))
> +		return -EINVAL;
> +
> +	ssched = kmalloc(optlen, GFP_KERNEL);
> +	if (!ssched)
> +		return -ENOMEM;
> +
> +	if (copy_from_user(ssched, optval, optlen)) {
> +		ret = -EFAULT;
> +		goto out;
> +	}

use memdup_user().

> +
> +	if (optlen != sizeof(struct sctp_sched) + ssched->ssched_priv_len) {
> +		ret = -EINVAL;
> +		goto out;
> +	}
> +
> +	ret = sctp_set_sched(sk, ssched->ssched_name);
> +	if (ret)
> +		goto out;
> +	sp->sched_priv_len = ssched->ssched_priv_len;
> +	kfree(sp->sched_priv);
> +	if (sp->sched_priv_len) {
> +		sp->sched_priv = kmalloc(sp->sched_priv_len, GFP_KERNEL);
> +		if (!sp->sched_priv) {
> +			ret = -ENOMEM;
> +			goto out;
> +		}
> +		memcpy(sp->sched_priv, ssched->ssched_priv, sp->sched_priv_len);
> +	}
> +
> +out:
> +	kfree(ssched);
> +	return ret;
> +}
> +
>  /*
>   * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
>   *
> @@ -3417,6 +3461,9 @@ SCTP_STATIC int sctp_setsockopt(struct s
>  		retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
>  		break;
> 
> +	case SCTP_SCHED:
> +		retval = sctp_setsockopt_sched(sk, optval, optlen);
> +		break;
>  	case SCTP_INITMSG:
>  		retval = sctp_setsockopt_initmsg(sk, optval, optlen);
>  		break;
> @@ -3642,7 +3689,10 @@ SCTP_STATIC int sctp_init_sock(struct so
>  	sp->initmsg.sinit_max_attempts   = sctp_max_retrans_init;
>  	sp->initmsg.sinit_max_init_timeo = sctp_rto_max;
> 
> +	/* Initialize default scheduling algorithm  */
>  	sp->sched_ops = sctp_default_sched_ops;
> +	sp->sched_priv_len = 0;
> +	sp->sched_priv = NULL;
> 

This part should be in the framework patch.  That way assoc will actually
inherit the proper pointer.


>  	/* Initialize default RTO related parameters.  These parameters can
>  	 * be modified for with the SCTP_RTOINFO socket option.
> @@ -3735,6 +3785,9 @@ SCTP_STATIC void sctp_destroy_sock(struc
> 
>  	SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
> 
> +	sctp_cleanup_sched(sk);
> +	kfree(sctp_sk(sk)->sched_priv);
> +
>  	/* Release our hold on the endpoint. */
>  	ep = sctp_sk(sk)->ep;
>  	sctp_endpoint_free(ep);
> @@ -4351,6 +4404,35 @@ static int sctp_getsockopt_initmsg(struc
>  	return 0;
>  }
> 
> +/* Get the multistream scheduling algorithm*/
> +static int sctp_getsockopt_sched(struct sock *sk, int len, char __user *optval,
> +							int __user *optlen)
> +{
> +	struct sctp_sched *ssched;
> +	int sz = sizeof(struct sctp_sched) + sctp_sk(sk)->sched_priv_len;
> +	int ret = 0;
> +
> +	if (len < sz)
> +		return -EINVAL;
> +	if (put_user(sz, optlen))
> +		return -EFAULT;
> +
> +	ssched = kmalloc(sz, GFP_KERNEL);
> +	if (!ssched)
> +		return -EFAULT;
> +	memcpy(ssched->ssched_name, sctp_sk(sk)->sched_ops->name,
> +					SCTP_SCHED_NAME_MAX);
> +	ssched->ssched_priv_len = sctp_sk(sk)->sched_priv_len;
> +	memcpy(ssched->ssched_priv, sctp_sk(sk)->sched_priv,
> +					ssched->ssched_priv_len);
> +
> +	if (copy_to_user(optval, ssched, sz))
> +		ret = -EFAULT;
> +

Don't forget to also copy out the sz to let user know how long the data
is.

-vlad

> +	kfree(ssched);
> +	return ret;
> +}
> +
>  static int sctp_getsockopt_peer_addrs_num_old(struct sock *sk, int len,
>  					      char __user *optval,
>  					      int __user *optlen)
> @@ -5605,6 +5687,9 @@ SCTP_STATIC int sctp_getsockopt(struct s
>  	case SCTP_INITMSG:
>  		retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
>  		break;
> +	case SCTP_SCHED:
> +		retval = sctp_getsockopt_sched(sk, len, optval, optlen);
> +		break;
>  	case SCTP_GET_PEER_ADDRS_NUM_OLD:
>  		retval = sctp_getsockopt_peer_addrs_num_old(sk, len, optval,
>  							    optlen);
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