Annotation of sys/net80211/ieee80211_amrr.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ieee80211_amrr.c,v 1.3 2007/06/16 13:17:05 damien Exp $ */
2:
3: /*-
4: * Copyright (c) 2006
5: * Damien Bergamini <damien.bergamini@free.fr>
6: *
7: * Permission to use, copy, modify, and distribute this software for any
8: * purpose with or without fee is hereby granted, provided that the above
9: * copyright notice and this permission notice appear in all copies.
10: *
11: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18: */
19:
20: #include <sys/param.h>
21: #include <sys/kernel.h>
22: #include <sys/socket.h>
23: #include <sys/sysctl.h>
24:
25: #include <net/if.h>
26: #include <net/if_media.h>
27:
28: #ifdef INET
29: #include <netinet/in.h>
30: #include <netinet/if_ether.h>
31: #endif
32:
33: #include <net80211/ieee80211_var.h>
34: #include <net80211/ieee80211_amrr.h>
35:
36: #define is_success(amn) \
37: ((amn)->amn_retrycnt < (amn)->amn_txcnt / 10)
38: #define is_failure(amn) \
39: ((amn)->amn_retrycnt > (amn)->amn_txcnt / 3)
40: #define is_enough(amn) \
41: ((amn)->amn_txcnt > 10)
42: #define is_min_rate(ni) \
43: ((ni)->ni_txrate == 0)
44: #define is_max_rate(ni) \
45: ((ni)->ni_txrate == (ni)->ni_rates.rs_nrates - 1)
46: #define increase_rate(ni) \
47: ((ni)->ni_txrate++)
48: #define decrease_rate(ni) \
49: ((ni)->ni_txrate--)
50: #define reset_cnt(amn) \
51: do { (amn)->amn_txcnt = (amn)->amn_retrycnt = 0; } while (0)
52:
53: void
54: ieee80211_amrr_node_init(const struct ieee80211_amrr *amrr,
55: struct ieee80211_amrr_node *amn)
56: {
57: amn->amn_success = 0;
58: amn->amn_recovery = 0;
59: amn->amn_txcnt = amn->amn_retrycnt = 0;
60: amn->amn_success_threshold = amrr->amrr_min_success_threshold;
61: }
62:
63: /*
64: * Update ni->ni_txrate.
65: */
66: void
67: ieee80211_amrr_choose(struct ieee80211_amrr *amrr, struct ieee80211_node *ni,
68: struct ieee80211_amrr_node *amn)
69: {
70: int need_change = 0;
71:
72: if (is_success(amn) && is_enough(amn)) {
73: amn->amn_success++;
74: if (amn->amn_success >= amn->amn_success_threshold &&
75: !is_max_rate(ni)) {
76: amn->amn_recovery = 1;
77: amn->amn_success = 0;
78: increase_rate(ni);
79: IEEE80211_DPRINTF(("AMRR increasing rate %d (txcnt=%d "
80: "retrycnt=%d)\n",
81: ni->ni_rates.rs_rates[ni->ni_txrate] &
82: IEEE80211_RATE_VAL,
83: amn->amn_txcnt, amn->amn_retrycnt));
84: need_change = 1;
85: } else {
86: amn->amn_recovery = 0;
87: }
88: } else if (is_failure(amn)) {
89: amn->amn_success = 0;
90: if (!is_min_rate(ni)) {
91: if (amn->amn_recovery) {
92: amn->amn_success_threshold *= 2;
93: if (amn->amn_success_threshold >
94: amrr->amrr_max_success_threshold)
95: amn->amn_success_threshold =
96: amrr->amrr_max_success_threshold;
97: } else {
98: amn->amn_success_threshold =
99: amrr->amrr_min_success_threshold;
100: }
101: decrease_rate(ni);
102: IEEE80211_DPRINTF(("AMRR decreasing rate %d (txcnt=%d "
103: "retrycnt=%d)\n",
104: ni->ni_rates.rs_rates[ni->ni_txrate] &
105: IEEE80211_RATE_VAL,
106: amn->amn_txcnt, amn->amn_retrycnt));
107: need_change = 1;
108: }
109: amn->amn_recovery = 0;
110: }
111:
112: if (is_enough(amn) || need_change)
113: reset_cnt(amn);
114: }
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