Commit | Line | Data |
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c6c8fea2 | 1 | /* |
64afe353 | 2 | * Copyright (C) 2009-2011 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
23 | #include "gateway_common.h" | |
24 | #include "gateway_client.h" | |
25 | ||
26 | /* calculates the gateway class from kbit */ | |
27 | static void kbit_to_gw_bandwidth(int down, int up, long *gw_srv_class) | |
28 | { | |
29 | int mdown = 0, tdown, tup, difference; | |
30 | uint8_t sbit, part; | |
31 | ||
32 | *gw_srv_class = 0; | |
33 | difference = 0x0FFFFFFF; | |
34 | ||
35 | /* test all downspeeds */ | |
36 | for (sbit = 0; sbit < 2; sbit++) { | |
37 | for (part = 0; part < 16; part++) { | |
38 | tdown = 32 * (sbit + 2) * (1 << part); | |
39 | ||
40 | if (abs(tdown - down) < difference) { | |
41 | *gw_srv_class = (sbit << 7) + (part << 3); | |
42 | difference = abs(tdown - down); | |
43 | mdown = tdown; | |
44 | } | |
45 | } | |
46 | } | |
47 | ||
48 | /* test all upspeeds */ | |
49 | difference = 0x0FFFFFFF; | |
50 | ||
51 | for (part = 0; part < 8; part++) { | |
52 | tup = ((part + 1) * (mdown)) / 8; | |
53 | ||
54 | if (abs(tup - up) < difference) { | |
55 | *gw_srv_class = (*gw_srv_class & 0xF8) | part; | |
56 | difference = abs(tup - up); | |
57 | } | |
58 | } | |
59 | } | |
60 | ||
61 | /* returns the up and downspeeds in kbit, calculated from the class */ | |
62 | void gw_bandwidth_to_kbit(uint8_t gw_srv_class, int *down, int *up) | |
63 | { | |
64 | char sbit = (gw_srv_class & 0x80) >> 7; | |
65 | char dpart = (gw_srv_class & 0x78) >> 3; | |
66 | char upart = (gw_srv_class & 0x07); | |
67 | ||
68 | if (!gw_srv_class) { | |
69 | *down = 0; | |
70 | *up = 0; | |
71 | return; | |
72 | } | |
73 | ||
74 | *down = 32 * (sbit + 2) * (1 << dpart); | |
75 | *up = ((upart + 1) * (*down)) / 8; | |
76 | } | |
77 | ||
78 | static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff, | |
79 | long *up, long *down) | |
80 | { | |
81 | int ret, multi = 1; | |
82 | char *slash_ptr, *tmp_ptr; | |
83 | ||
84 | slash_ptr = strchr(buff, '/'); | |
85 | if (slash_ptr) | |
86 | *slash_ptr = 0; | |
87 | ||
88 | if (strlen(buff) > 4) { | |
89 | tmp_ptr = buff + strlen(buff) - 4; | |
90 | ||
91 | if (strnicmp(tmp_ptr, "mbit", 4) == 0) | |
92 | multi = 1024; | |
93 | ||
94 | if ((strnicmp(tmp_ptr, "kbit", 4) == 0) || | |
95 | (multi > 1)) | |
96 | *tmp_ptr = '\0'; | |
97 | } | |
98 | ||
99 | ret = strict_strtoul(buff, 10, down); | |
100 | if (ret) { | |
101 | bat_err(net_dev, | |
102 | "Download speed of gateway mode invalid: %s\n", | |
103 | buff); | |
104 | return false; | |
105 | } | |
106 | ||
107 | *down *= multi; | |
108 | ||
109 | /* we also got some upload info */ | |
110 | if (slash_ptr) { | |
111 | multi = 1; | |
112 | ||
113 | if (strlen(slash_ptr + 1) > 4) { | |
114 | tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1); | |
115 | ||
116 | if (strnicmp(tmp_ptr, "mbit", 4) == 0) | |
117 | multi = 1024; | |
118 | ||
119 | if ((strnicmp(tmp_ptr, "kbit", 4) == 0) || | |
120 | (multi > 1)) | |
121 | *tmp_ptr = '\0'; | |
122 | } | |
123 | ||
124 | ret = strict_strtoul(slash_ptr + 1, 10, up); | |
125 | if (ret) { | |
126 | bat_err(net_dev, | |
127 | "Upload speed of gateway mode invalid: " | |
128 | "%s\n", slash_ptr + 1); | |
129 | return false; | |
130 | } | |
131 | ||
132 | *up *= multi; | |
133 | } | |
134 | ||
135 | return true; | |
136 | } | |
137 | ||
138 | ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count) | |
139 | { | |
140 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
141 | long gw_bandwidth_tmp = 0, up = 0, down = 0; | |
142 | bool ret; | |
143 | ||
144 | ret = parse_gw_bandwidth(net_dev, buff, &up, &down); | |
145 | if (!ret) | |
146 | goto end; | |
147 | ||
148 | if ((!down) || (down < 256)) | |
149 | down = 2000; | |
150 | ||
151 | if (!up) | |
152 | up = down / 5; | |
153 | ||
154 | kbit_to_gw_bandwidth(down, up, &gw_bandwidth_tmp); | |
155 | ||
156 | /** | |
157 | * the gw bandwidth we guessed above might not match the given | |
158 | * speeds, hence we need to calculate it back to show the number | |
159 | * that is going to be propagated | |
160 | **/ | |
161 | gw_bandwidth_to_kbit((uint8_t)gw_bandwidth_tmp, | |
162 | (int *)&down, (int *)&up); | |
163 | ||
164 | gw_deselect(bat_priv); | |
165 | bat_info(net_dev, "Changing gateway bandwidth from: '%i' to: '%ld' " | |
166 | "(propagating: %ld%s/%ld%s)\n", | |
167 | atomic_read(&bat_priv->gw_bandwidth), gw_bandwidth_tmp, | |
168 | (down > 2048 ? down / 1024 : down), | |
169 | (down > 2048 ? "MBit" : "KBit"), | |
170 | (up > 2048 ? up / 1024 : up), | |
171 | (up > 2048 ? "MBit" : "KBit")); | |
172 | ||
173 | atomic_set(&bat_priv->gw_bandwidth, gw_bandwidth_tmp); | |
174 | ||
175 | end: | |
176 | return count; | |
177 | } |