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