linux/net/atm/atm_misc.c

// SPDX-License-Identifier: GPL-2.0
/* net/atm/atm_misc.c - Various functions for use by ATM drivers */

/* Written 1995-2000 by Werner Almesberger, EPFL ICA */

#include <linux/module.h>
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/skbuff.h>
#include <linux/sonet.h>
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/atomic.h>

int atm_charge(struct atm_vcc *vcc, int truesize)
{ … }
EXPORT_SYMBOL(…);

struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc, int pdu_size,
				 gfp_t gfp_flags)
{ … }
EXPORT_SYMBOL(…);


/*
 * atm_pcr_goal returns the positive PCR if it should be rounded up, the
 * negative PCR if it should be rounded down, and zero if the maximum available
 * bandwidth should be used.
 *
 * The rules are as follows (* = maximum, - = absent (0), x = value "x",
 * (x+ = x or next value above x, x- = x or next value below):
 *
 *	min max pcr	result		min max pcr	result
 *	-   -   -	* (UBR only)	x   -   -	x+
 *	-   -   *	*		x   -   *	*
 *	-   -   z	z-		x   -   z	z-
 *	-   *   -	*		x   *   -	x+
 *	-   *   *	*		x   *   *	*
 *	-   *   z	z-		x   *   z	z-
 *	-   y   -	y-		x   y   -	x+
 *	-   y   *	y-		x   y   *	y-
 *	-   y   z	z-		x   y   z	z-
 *
 * All non-error cases can be converted with the following simple set of rules:
 *
 *   if pcr == z then z-
 *   else if min == x && pcr == - then x+
 *     else if max == y then y-
 *	 else *
 */

int atm_pcr_goal(const struct atm_trafprm *tp)
{ … }
EXPORT_SYMBOL(…);

void sonet_copy_stats(struct k_sonet_stats *from, struct sonet_stats *to)
{ … }
EXPORT_SYMBOL(…);

void sonet_subtract_stats(struct k_sonet_stats *from, struct sonet_stats *to)
{ … }
EXPORT_SYMBOL(…);