(Fast) Prio

Attribute Modification
int	rtnl_qdisc_prio_set_bands (struct rtnl_qdisc *qdisc, int bands)
	Set number of bands of PRIO qdisc.
int	rtnl_qdisc_prio_get_bands (struct rtnl_qdisc *qdisc)
	Get number of bands of PRIO qdisc.
int	rtnl_qdisc_prio_set_priomap (struct rtnl_qdisc *qdisc, uint8_t priomap[], int len)
	Set priomap of the PRIO qdisc.
uint8_t *	rtnl_qdisc_prio_get_priomap (struct rtnl_qdisc *qdisc)
	Get priomap of a PRIO qdisc.

Priority Band Translations
char *	rtnl_prio2str (int prio, char *buf, size_t size)
	Convert priority to character string.
int	rtnl_str2prio (const char *name)
	Convert character string to priority.

Default Values
#define	QDISC_PRIO_DEFAULT_BANDS   3
	Default number of bands.
#define	QDISC_PRIO_DEFAULT_PRIOMAP   { 1, 2, 2, 2, 1, 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 }
	Default priority mapping.

---

Detailed Description

1) Typical PRIO configuration

   // Specify the maximal number of bands to be used for this PRIO qdisc.
   rtnl_qdisc_prio_set_bands(qdisc, QDISC_PRIO_DEFAULT_BANDS);
  
   // Provide a map assigning each priority to a band number.
   uint8_t map[] = QDISC_PRIO_DEFAULT_PRIOMAP;
   rtnl_qdisc_prio_set_priomap(qdisc, map, sizeof(map));

---

Function Documentation

int rtnl_qdisc_prio_set_bands	(	struct rtnl_qdisc *	qdisc,
		int	bands
	)

Parameters:

qdisc	PRIO qdisc to be modified.
bands	New number of bands.

Returns:

0 on success or a negative error code.

Definition at line 170 of file prio.c.

{
        struct rtnl_prio *prio;
        
        prio = prio_alloc(qdisc);
        if (!prio)
                return nl_errno(ENOMEM);

        prio->qp_bands = bands;
        prio->qp_mask |= SCH_PRIO_ATTR_BANDS;

        return 0;
}

int rtnl_qdisc_prio_get_bands

(

struct rtnl_qdisc *

qdisc

)

Parameters:

qdisc

PRIO qdisc.

Returns:

Number of bands or a negative error code.

Definition at line 189 of file prio.c.

{
        struct rtnl_prio *prio;

        prio = prio_qdisc(qdisc);
        if (prio && prio->qp_mask & SCH_PRIO_ATTR_BANDS)
                return prio->qp_bands;
        else
                return nl_errno(ENOMEM);
}

int rtnl_qdisc_prio_set_priomap	(	struct rtnl_qdisc *	qdisc,
		uint8_t	priomap[],
		int	len
	)

Parameters:

qdisc	PRIO qdisc to be modified.
priomap	New priority mapping.
len	Length of priomap (# of elements).

Returns:

0 on success or a negative error code.

Definition at line 207 of file prio.c.

{
        struct rtnl_prio *prio;
        int i;

        prio = prio_alloc(qdisc);
        if (!prio)
                return nl_errno(ENOMEM);

        if (!(prio->qp_mask & SCH_PRIO_ATTR_BANDS))
                return nl_error(EINVAL, "Set number of bands first");

        if ((len / sizeof(uint8_t)) > (TC_PRIO_MAX+1))
                return nl_error(ERANGE, "priomap length out of bounds");

        for (i = 0; i <= TC_PRIO_MAX; i++) {
                if (priomap[i] > prio->qp_bands)
                        return nl_error(ERANGE, "priomap element %d " \
                            "out of bounds, increase bands number");
        }

        memcpy(prio->qp_priomap, priomap, len);
        prio->qp_mask |= SCH_PRIO_ATTR_PRIOMAP;

        return 0;
}

uint8_t* rtnl_qdisc_prio_get_priomap

(

struct rtnl_qdisc *

qdisc

)

Parameters:

qdisc

PRIO qdisc.

Returns:

Priority mapping as array of size TC_PRIO_MAX+1 or NULL if an error occured.

Definition at line 241 of file prio.c.

{
        struct rtnl_prio *prio;

        prio = prio_qdisc(qdisc);
        if (prio && prio->qp_mask & SCH_PRIO_ATTR_PRIOMAP)
                return prio->qp_priomap;
        else {
                nl_errno(ENOENT);
                return NULL;
        }
}

char* rtnl_prio2str	(	int	prio,
		char *	buf,
		size_t	size
	)

Parameters:

prio	Priority.
buf	Destination buffer
size	Size of destination buffer.

Converts a priority to a character string and stores the result in the specified destination buffer.

Returns:

Name of priority as character string.

Definition at line 281 of file prio.c.

{
        return __type2str(prio, buf, size, prios, ARRAY_SIZE(prios));
}

int rtnl_str2prio

(

const char *

name

)

Parameters:

name	Name of priority.

Converts the provided character string specifying a priority to the corresponding numeric value.

Returns:

Numeric priority or a negative value if no match was found.

Definition at line 295 of file prio.c.

{
        return __str2type(name, prios, ARRAY_SIZE(prios));
}