cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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atm_misc.c (2671B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* net/atm/atm_misc.c - Various functions for use by ATM drivers */
      3
      4/* Written 1995-2000 by Werner Almesberger, EPFL ICA */
      5
      6#include <linux/module.h>
      7#include <linux/atm.h>
      8#include <linux/atmdev.h>
      9#include <linux/skbuff.h>
     10#include <linux/sonet.h>
     11#include <linux/bitops.h>
     12#include <linux/errno.h>
     13#include <linux/atomic.h>
     14
     15int atm_charge(struct atm_vcc *vcc, int truesize)
     16{
     17	atm_force_charge(vcc, truesize);
     18	if (atomic_read(&sk_atm(vcc)->sk_rmem_alloc) <= sk_atm(vcc)->sk_rcvbuf)
     19		return 1;
     20	atm_return(vcc, truesize);
     21	atomic_inc(&vcc->stats->rx_drop);
     22	return 0;
     23}
     24EXPORT_SYMBOL(atm_charge);
     25
     26struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc, int pdu_size,
     27				 gfp_t gfp_flags)
     28{
     29	struct sock *sk = sk_atm(vcc);
     30	int guess = SKB_TRUESIZE(pdu_size);
     31
     32	atm_force_charge(vcc, guess);
     33	if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
     34		struct sk_buff *skb = alloc_skb(pdu_size, gfp_flags);
     35
     36		if (skb) {
     37			atomic_add(skb->truesize-guess,
     38				   &sk->sk_rmem_alloc);
     39			return skb;
     40		}
     41	}
     42	atm_return(vcc, guess);
     43	atomic_inc(&vcc->stats->rx_drop);
     44	return NULL;
     45}
     46EXPORT_SYMBOL(atm_alloc_charge);
     47
     48
     49/*
     50 * atm_pcr_goal returns the positive PCR if it should be rounded up, the
     51 * negative PCR if it should be rounded down, and zero if the maximum available
     52 * bandwidth should be used.
     53 *
     54 * The rules are as follows (* = maximum, - = absent (0), x = value "x",
     55 * (x+ = x or next value above x, x- = x or next value below):
     56 *
     57 *	min max pcr	result		min max pcr	result
     58 *	-   -   -	* (UBR only)	x   -   -	x+
     59 *	-   -   *	*		x   -   *	*
     60 *	-   -   z	z-		x   -   z	z-
     61 *	-   *   -	*		x   *   -	x+
     62 *	-   *   *	*		x   *   *	*
     63 *	-   *   z	z-		x   *   z	z-
     64 *	-   y   -	y-		x   y   -	x+
     65 *	-   y   *	y-		x   y   *	y-
     66 *	-   y   z	z-		x   y   z	z-
     67 *
     68 * All non-error cases can be converted with the following simple set of rules:
     69 *
     70 *   if pcr == z then z-
     71 *   else if min == x && pcr == - then x+
     72 *     else if max == y then y-
     73 *	 else *
     74 */
     75
     76int atm_pcr_goal(const struct atm_trafprm *tp)
     77{
     78	if (tp->pcr && tp->pcr != ATM_MAX_PCR)
     79		return -tp->pcr;
     80	if (tp->min_pcr && !tp->pcr)
     81		return tp->min_pcr;
     82	if (tp->max_pcr != ATM_MAX_PCR)
     83		return -tp->max_pcr;
     84	return 0;
     85}
     86EXPORT_SYMBOL(atm_pcr_goal);
     87
     88void sonet_copy_stats(struct k_sonet_stats *from, struct sonet_stats *to)
     89{
     90#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
     91	__SONET_ITEMS
     92#undef __HANDLE_ITEM
     93}
     94EXPORT_SYMBOL(sonet_copy_stats);
     95
     96void sonet_subtract_stats(struct k_sonet_stats *from, struct sonet_stats *to)
     97{
     98#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
     99	__SONET_ITEMS
    100#undef __HANDLE_ITEM
    101}
    102EXPORT_SYMBOL(sonet_subtract_stats);