path: root/include/linux/pkt_sched.h

#ifndef __LINUX_PKT_SCHED_H
#define __LINUX_PKT_SCHED_H

/* Logical priority bands not depending on specific packet scheduler.
   Every scheduler will map them to real traffic classes, if it has
   no more precise mechanism to classify packets.

   These numbers have no special meaning, though their coincidence
   with obsolete IPv6 values is not occasional :-). New IPv6 drafts
   preferred full anarchy inspired by diffserv group.

   Note: TC_PRIO_BESTEFFORT does not mean that it is the most unhappy
   class, actually, as rule it will be handled with more care than
   filler or even bulk.
 */

#define TC_PRIO_BESTEFFORT		0
#define TC_PRIO_FILLER			1
#define TC_PRIO_BULK			2
#define TC_PRIO_INTERACTIVE_BULK	4
#define TC_PRIO_INTERACTIVE		6
#define TC_PRIO_CONTROL			7

#define TC_PRIO_MAX			15

/* Generic queue statistics, available for all the elements.
   Particular schedulers may have also their private records.
 */

struct tc_stats
{
	__u64	bytes;			/* NUmber of enqueues bytes */
	__u32	packets;		/* Number of enqueued packets	*/
	__u32	drops;			/* Packets dropped because of lack of resources */
	__u32	overlimits;		/* Number of throttle events when this
					 * flow goes out of allocated bandwidth */
	__u32	bps;			/* Current flow byte rate */
	__u32	pps;			/* Current flow packet rate */
	__u32	qlen;
	__u32	backlog;
#ifdef __KERNEL__
	spinlock_t *lock;
#endif
};

struct tc_estimator
{
	char		interval;
	unsigned char	ewma_log;
};

/* "Handles"
   ---------

    All the traffic control objects have 32bit identifiers, or "handles".

    They can be considered as opaque numbers from user API viewpoint,
    but actually they always consist of two fields: major and
    minor numbers, which are interpreted by kernel specially,
    that may be used by applications, though not recommended.

    F.e. qdisc handles always have minor number equal to zero,
    classes (or flows) have major equal to parent qdisc major, and
    minor uniquely identifying class inside qdisc.

    Macros to manipulate handles:
 */

#define TC_H_MAJ_MASK (0xFFFF0000U)
#define TC_H_MIN_MASK (0x0000FFFFU)
#define TC_H_MAJ(h) ((h)&TC_H_MAJ_MASK)
#define TC_H_MIN(h) ((h)&TC_H_MIN_MASK)
#define TC_H_MAKE(maj,min) (((maj)&TC_H_MAJ_MASK)|((min)&TC_H_MIN_MASK))

#define TC_H_UNSPEC	(0U)
#define TC_H_ROOT	(0xFFFFFFFFU)

struct tc_ratespec
{
	unsigned char	cell_log;
	unsigned char	__reserved;
	unsigned short	feature;
	short		addend;
	unsigned short	mpu;
	__u32		rate;
};

/* FIFO section */

struct tc_fifo_qopt
{
	__u32	limit;	/* Queue length: bytes for bfifo, packets for pfifo */
};

/* PRIO section */

#define TCQ_PRIO_BANDS	16

struct tc_prio_qopt
{
	int	bands;			/* Number of bands */
	__u8	priomap[TC_PRIO_MAX+1];	/* Map: logical priority -> PRIO band */
};

/* CSZ section */

struct tc_csz_qopt
{
	int		flows;		/* Maximal number of guaranteed flows */
	unsigned char	R_log;		/* Fixed point position for round number */
	unsigned char	delta_log;	/* Log of maximal managed time interval */
	__u8		priomap[TC_PRIO_MAX+1];	/* Map: logical priority -> CSZ band */
};

struct tc_csz_copt
{
	struct tc_ratespec slice;
	struct tc_ratespec rate;
	struct tc_ratespec peakrate;
	__u32		limit;
	__u32		buffer;
	__u32		mtu;
};

enum
{
	TCA_CSZ_UNSPEC,
	TCA_CSZ_PARMS,
	TCA_CSZ_RTAB,
	TCA_CSZ_PTAB,
};

/* TBF section */

struct tc_tbf_qopt
{
	struct tc_ratespec rate;
	struct tc_ratespec peakrate;
	__u32		limit;
	__u32		buffer;
	__u32		mtu;
};

enum
{
	TCA_TBF_UNSPEC,
	TCA_TBF_PARMS,
	TCA_TBF_RTAB,
	TCA_TBF_PTAB,
};


/* TEQL section */

/* TEQL does not require any parameters */

/* SFQ section */

struct tc_sfq_qopt
{
	unsigned	quantum;	/* Bytes per round allocated to flow */
	int		perturb_period;	/* Period of hash perturbation */
	__u32		limit;		/* Maximal packets in queue */
	unsigned	divisor;	/* Hash divisor  */
	unsigned	flows;		/* Maximal number of flows  */
};

/*
 *  NOTE: limit, divisor and flows are hardwired to code at the moment.
 *
 *	limit=flows=128, divisor=1024;
 *
 *	The only reason for this is efficiency, it is possible
 *	to change these parameters in compile time.
 */

/* RED section */

enum
{
	TCA_RED_UNSPEC,
	TCA_RED_PARMS,
	TCA_RED_STAB,
};

struct tc_red_qopt
{
	__u32		limit;		/* HARD maximal queue length (bytes)	*/
	__u32		qth_min;	/* Min average length threshold (bytes) */
	__u32		qth_max;	/* Max average length threshold (bytes) */
	unsigned char   Wlog;		/* log(W)		*/
	unsigned char   Plog;		/* log(P_max/(qth_max-qth_min))	*/
	unsigned char   Scell_log;	/* cell size for idle damping */
};

/* CBQ section */

#define TC_CBQ_MAXPRIO		8
#define TC_CBQ_MAXLEVEL		8
#define TC_CBQ_DEF_EWMA		5

struct tc_cbq_lssopt
{
	unsigned char	change;
	unsigned char	flags;
#define TCF_CBQ_LSS_BOUNDED	1
#define TCF_CBQ_LSS_ISOLATED	2
	unsigned char  	ewma_log;
	unsigned char  	level;
#define TCF_CBQ_LSS_FLAGS	1
#define TCF_CBQ_LSS_EWMA	2
#define TCF_CBQ_LSS_MAXIDLE	4
#define TCF_CBQ_LSS_MINIDLE	8
#define TCF_CBQ_LSS_OFFTIME	0x10
#define TCF_CBQ_LSS_AVPKT	0x20
	__u32		maxidle;
	__u32		minidle;
	__u32		offtime;
	__u32		avpkt;
};

struct tc_cbq_wrropt
{
	unsigned char	flags;
	unsigned char	priority;
	unsigned char	cpriority;
	unsigned char	__reserved;
	__u32		allot;
	__u32		weight;
};

struct tc_cbq_ovl
{
	unsigned char	strategy;
#define	TC_CBQ_OVL_CLASSIC	0
#define	TC_CBQ_OVL_DELAY	1
#define	TC_CBQ_OVL_LOWPRIO	2
#define	TC_CBQ_OVL_DROP		3
#define	TC_CBQ_OVL_RCLASSIC	4
	unsigned char	priority2;
	__u32		penalty;
};

struct tc_cbq_police
{
	unsigned char	police;
	unsigned char	__res1;
	unsigned short	__res2;
};

struct tc_cbq_fopt
{
	__u32		split;
	__u32		defmap;
	__u32		defchange;
};

struct tc_cbq_xstats
{
	__u32		borrows;
	__u32		overactions;
	__s32		avgidle;
	__s32		undertime;
};

enum
{
	TCA_CBQ_UNSPEC,
	TCA_CBQ_LSSOPT,
	TCA_CBQ_WRROPT,
	TCA_CBQ_FOPT,
	TCA_CBQ_OVL_STRATEGY,
	TCA_CBQ_RATE,
	TCA_CBQ_RTAB,
	TCA_CBQ_POLICE,
};

#define TCA_CBQ_MAX	TCA_CBQ_POLICE

/* ATM  section */

enum {
	TCA_ATM_UNSPEC,
	TCA_ATM_FD,		/* file/socket descriptor */
	TCA_ATM_PTR,		/* pointer to descriptor - later */
	TCA_ATM_HDR,		/* LL header */
	TCA_ATM_EXCESS,		/* excess traffic class (0 for CLP)  */
	TCA_ATM_ADDR,		/* PVC address (for output only) */
	TCA_ATM_STATE		/* VC state (ATM_VS_*; for output only) */
};

#define TCA_ATM_MAX	TCA_ATM_STATE

#endif