Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* net/atm/atm_misc.c - Various functions for use by ATM drivers */ |
| 3 | |
| 4 | /* Written 1995-2000 by Werner Almesberger, EPFL ICA */ |
| 5 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 12 | #include <linux/errno.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 13 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 15 | int atm_charge(struct atm_vcc *vcc, int truesize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | { |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 17 | atm_force_charge(vcc, truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | if (atomic_read(&sk_atm(vcc)->sk_rmem_alloc) <= sk_atm(vcc)->sk_rcvbuf) |
| 19 | return 1; |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 20 | atm_return(vcc, truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | atomic_inc(&vcc->stats->rx_drop); |
| 22 | return 0; |
| 23 | } |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 24 | EXPORT_SYMBOL(atm_charge); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 26 | struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc, int pdu_size, |
| 27 | gfp_t gfp_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | { |
| 29 | struct sock *sk = sk_atm(vcc); |
chas williams - CONTRACTOR | 49f5ed4 | 2011-11-22 12:51:56 +0000 | [diff] [blame] | 30 | int guess = SKB_TRUESIZE(pdu_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 32 | atm_force_charge(vcc, guess); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 34 | struct sk_buff *skb = alloc_skb(pdu_size, gfp_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | if (skb) { |
| 37 | atomic_add(skb->truesize-guess, |
| 38 | &sk->sk_rmem_alloc); |
| 39 | return skb; |
| 40 | } |
| 41 | } |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 42 | atm_return(vcc, guess); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | atomic_inc(&vcc->stats->rx_drop); |
| 44 | return NULL; |
| 45 | } |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 46 | EXPORT_SYMBOL(atm_alloc_charge); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Mitchell Blank Jr | c219750 | 2005-11-29 16:13:55 -0800 | [diff] [blame] | 76 | int atm_pcr_goal(const struct atm_trafprm *tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | { |
Mitchell Blank Jr | c219750 | 2005-11-29 16:13:55 -0800 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | return 0; |
| 85 | } |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 86 | EXPORT_SYMBOL(atm_pcr_goal); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 88 | void sonet_copy_stats(struct k_sonet_stats *from, struct sonet_stats *to) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
| 90 | #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i) |
| 91 | __SONET_ITEMS |
| 92 | #undef __HANDLE_ITEM |
| 93 | } |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 94 | EXPORT_SYMBOL(sonet_copy_stats); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 96 | void sonet_subtract_stats(struct k_sonet_stats *from, struct sonet_stats *to) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | { |
Joe Perches | 3356b4d | 2010-01-26 11:40:02 +0000 | [diff] [blame] | 98 | #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | __SONET_ITEMS |
| 100 | #undef __HANDLE_ITEM |
| 101 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | EXPORT_SYMBOL(sonet_subtract_stats); |