1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -438,139 +438,6 @@ struct Qdisc_ops noqueue_qdisc_ops __rea
.owner = THIS_MODULE,
};
-static const u8 prio2band[TC_PRIO_MAX + 1] = {
- 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1
-};
-
-/* 3-band FIFO queue: old style, but should be a bit faster than
- generic prio+fifo combination.
- */
-
-#define PFIFO_FAST_BANDS 3
-
-/*
- * Private data for a pfifo_fast scheduler containing:
- * - queues for the three band
- * - bitmap indicating which of the bands contain skbs
- */
-struct pfifo_fast_priv {
- u32 bitmap;
- struct sk_buff_head q[PFIFO_FAST_BANDS];
-};
-
-/*
- * Convert a bitmap to the first band number where an skb is queued, where:
- * bitmap=0 means there are no skbs on any band.
- * bitmap=1 means there is an skb on band 0.
- * bitmap=7 means there are skbs on all 3 bands, etc.
- */
-static const int bitmap2band[] = {-1, 0, 1, 0, 2, 0, 1, 0};
-
-static inline struct sk_buff_head *band2list(struct pfifo_fast_priv *priv,
- int band)
-{
- return priv->q + band;
-}
-
-static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc)
-{
- if (skb_queue_len(&qdisc->q) < qdisc_dev(qdisc)->tx_queue_len) {
- int band = prio2band[skb->priority & TC_PRIO_MAX];
- struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
- struct sk_buff_head *list = band2list(priv, band);
-
- priv->bitmap |= (1 << band);
- qdisc->q.qlen++;
- return __qdisc_enqueue_tail(skb, qdisc, list);
- }
-
- return qdisc_drop(skb, qdisc);
-}
-
-static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc)
-{
- struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
- int band = bitmap2band[priv->bitmap];
-
- if (likely(band >= 0)) {
- struct sk_buff_head *list = band2list(priv, band);
- struct sk_buff *skb = __qdisc_dequeue_head(qdisc, list);
-
- qdisc->q.qlen--;
- if (skb_queue_empty(list))
- priv->bitmap &= ~(1 << band);
-
- return skb;
- }
-
- return NULL;
-}
-
-static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc)
-{
- struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
- int band = bitmap2band[priv->bitmap];
-
- if (band >= 0) {
- struct sk_buff_head *list = band2list(priv, band);
-
- return skb_peek(list);
- }
-
- return NULL;
-}
-
-static void pfifo_fast_reset(struct Qdisc *qdisc)
-{
- int prio;
- struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
-
- for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
- __qdisc_reset_queue(qdisc, band2list(priv, prio));
-
- priv->bitmap = 0;
- qdisc->qstats.backlog = 0;
- qdisc->q.qlen = 0;
-}
-
-static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb)
-{
- struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS };
-
- memcpy(&opt.priomap, prio2band, TC_PRIO_MAX + 1);
- if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
- goto nla_put_failure;
- return skb->len;
-
-nla_put_failure:
- return -1;
-}
-
-static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt)
-{
- int prio;
- struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
-
- for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
- __skb_queue_head_init(band2list(priv, prio));
-
- /* Can by-pass the queue discipline */
- qdisc->flags |= TCQ_F_CAN_BYPASS;
- return 0;
-}
-
-struct Qdisc_ops pfifo_fast_ops __read_mostly = {
- .id = "pfifo_fast",
- .priv_size = sizeof(struct pfifo_fast_priv),
- .enqueue = pfifo_fast_enqueue,
- .dequeue = pfifo_fast_dequeue,
- .peek = pfifo_fast_peek,
- .init = pfifo_fast_init,
- .reset = pfifo_fast_reset,
- .dump = pfifo_fast_dump,
- .owner = THIS_MODULE,
-};
-
static struct lock_class_key qdisc_tx_busylock;
struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
|
