60063497a9
This allows us to move duplicated code in <asm/atomic.h> (atomic_inc_not_zero() for now) to <linux/atomic.h> Signed-off-by: Arun Sharma <asharma@fb.com> Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: David Miller <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/* 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)
|
|
{
|
|
atm_force_charge(vcc, truesize);
|
|
if (atomic_read(&sk_atm(vcc)->sk_rmem_alloc) <= sk_atm(vcc)->sk_rcvbuf)
|
|
return 1;
|
|
atm_return(vcc, truesize);
|
|
atomic_inc(&vcc->stats->rx_drop);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(atm_charge);
|
|
|
|
struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc, int pdu_size,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct sock *sk = sk_atm(vcc);
|
|
int guess = atm_guess_pdu2truesize(pdu_size);
|
|
|
|
atm_force_charge(vcc, guess);
|
|
if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
|
|
struct sk_buff *skb = alloc_skb(pdu_size, gfp_flags);
|
|
|
|
if (skb) {
|
|
atomic_add(skb->truesize-guess,
|
|
&sk->sk_rmem_alloc);
|
|
return skb;
|
|
}
|
|
}
|
|
atm_return(vcc, guess);
|
|
atomic_inc(&vcc->stats->rx_drop);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(atm_alloc_charge);
|
|
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
if (tp->pcr && tp->pcr != ATM_MAX_PCR)
|
|
return -tp->pcr;
|
|
if (tp->min_pcr && !tp->pcr)
|
|
return tp->min_pcr;
|
|
if (tp->max_pcr != ATM_MAX_PCR)
|
|
return -tp->max_pcr;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(atm_pcr_goal);
|
|
|
|
void sonet_copy_stats(struct k_sonet_stats *from, struct sonet_stats *to)
|
|
{
|
|
#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
|
|
__SONET_ITEMS
|
|
#undef __HANDLE_ITEM
|
|
}
|
|
EXPORT_SYMBOL(sonet_copy_stats);
|
|
|
|
void sonet_subtract_stats(struct k_sonet_stats *from, struct sonet_stats *to)
|
|
{
|
|
#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
|
|
__SONET_ITEMS
|
|
#undef __HANDLE_ITEM
|
|
}
|
|
EXPORT_SYMBOL(sonet_subtract_stats);
|