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9cfc7bd6 | 1 | /* Copyright (C) 2009-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
3 | * Marek Lindner | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
c6c8fea2 SE |
18 | */ |
19 | ||
20 | #include "main.h" | |
21 | #include "gateway_common.h" | |
22 | #include "gateway_client.h" | |
23 | ||
24 | /* calculates the gateway class from kbit */ | |
25 | static void kbit_to_gw_bandwidth(int down, int up, long *gw_srv_class) | |
26 | { | |
27 | int mdown = 0, tdown, tup, difference; | |
28 | uint8_t sbit, part; | |
29 | ||
30 | *gw_srv_class = 0; | |
31 | difference = 0x0FFFFFFF; | |
32 | ||
33 | /* test all downspeeds */ | |
34 | for (sbit = 0; sbit < 2; sbit++) { | |
35 | for (part = 0; part < 16; part++) { | |
36 | tdown = 32 * (sbit + 2) * (1 << part); | |
37 | ||
38 | if (abs(tdown - down) < difference) { | |
39 | *gw_srv_class = (sbit << 7) + (part << 3); | |
40 | difference = abs(tdown - down); | |
41 | mdown = tdown; | |
42 | } | |
43 | } | |
44 | } | |
45 | ||
46 | /* test all upspeeds */ | |
47 | difference = 0x0FFFFFFF; | |
48 | ||
49 | for (part = 0; part < 8; part++) { | |
50 | tup = ((part + 1) * (mdown)) / 8; | |
51 | ||
52 | if (abs(tup - up) < difference) { | |
53 | *gw_srv_class = (*gw_srv_class & 0xF8) | part; | |
54 | difference = abs(tup - up); | |
55 | } | |
56 | } | |
57 | } | |
58 | ||
59 | /* returns the up and downspeeds in kbit, calculated from the class */ | |
84d5e5e0 | 60 | void batadv_gw_bandwidth_to_kbit(uint8_t gw_srv_class, int *down, int *up) |
c6c8fea2 | 61 | { |
b4e17054 SE |
62 | int sbit = (gw_srv_class & 0x80) >> 7; |
63 | int dpart = (gw_srv_class & 0x78) >> 3; | |
64 | int upart = (gw_srv_class & 0x07); | |
c6c8fea2 SE |
65 | |
66 | if (!gw_srv_class) { | |
67 | *down = 0; | |
68 | *up = 0; | |
69 | return; | |
70 | } | |
71 | ||
72 | *down = 32 * (sbit + 2) * (1 << dpart); | |
73 | *up = ((upart + 1) * (*down)) / 8; | |
74 | } | |
75 | ||
76 | static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff, | |
37a4065e | 77 | int *up, int *down) |
c6c8fea2 SE |
78 | { |
79 | int ret, multi = 1; | |
80 | char *slash_ptr, *tmp_ptr; | |
37a4065e | 81 | long ldown, lup; |
c6c8fea2 SE |
82 | |
83 | slash_ptr = strchr(buff, '/'); | |
84 | if (slash_ptr) | |
85 | *slash_ptr = 0; | |
86 | ||
87 | if (strlen(buff) > 4) { | |
88 | tmp_ptr = buff + strlen(buff) - 4; | |
89 | ||
90 | if (strnicmp(tmp_ptr, "mbit", 4) == 0) | |
91 | multi = 1024; | |
92 | ||
93 | if ((strnicmp(tmp_ptr, "kbit", 4) == 0) || | |
7c64fd98 | 94 | (multi > 1)) |
c6c8fea2 SE |
95 | *tmp_ptr = '\0'; |
96 | } | |
97 | ||
25a92b13 | 98 | ret = kstrtol(buff, 10, &ldown); |
c6c8fea2 SE |
99 | if (ret) { |
100 | bat_err(net_dev, | |
101 | "Download speed of gateway mode invalid: %s\n", | |
102 | buff); | |
103 | return false; | |
104 | } | |
105 | ||
37a4065e | 106 | *down = ldown * multi; |
c6c8fea2 SE |
107 | |
108 | /* we also got some upload info */ | |
109 | if (slash_ptr) { | |
110 | multi = 1; | |
111 | ||
112 | if (strlen(slash_ptr + 1) > 4) { | |
113 | tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1); | |
114 | ||
115 | if (strnicmp(tmp_ptr, "mbit", 4) == 0) | |
116 | multi = 1024; | |
117 | ||
118 | if ((strnicmp(tmp_ptr, "kbit", 4) == 0) || | |
7c64fd98 | 119 | (multi > 1)) |
c6c8fea2 SE |
120 | *tmp_ptr = '\0'; |
121 | } | |
122 | ||
25a92b13 | 123 | ret = kstrtol(slash_ptr + 1, 10, &lup); |
c6c8fea2 SE |
124 | if (ret) { |
125 | bat_err(net_dev, | |
86ceb360 SE |
126 | "Upload speed of gateway mode invalid: %s\n", |
127 | slash_ptr + 1); | |
c6c8fea2 SE |
128 | return false; |
129 | } | |
130 | ||
37a4065e | 131 | *up = lup * multi; |
c6c8fea2 SE |
132 | } |
133 | ||
134 | return true; | |
135 | } | |
136 | ||
84d5e5e0 SE |
137 | ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff, |
138 | size_t count) | |
c6c8fea2 SE |
139 | { |
140 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
37a4065e SE |
141 | long gw_bandwidth_tmp = 0; |
142 | int up = 0, down = 0; | |
c6c8fea2 SE |
143 | bool ret; |
144 | ||
145 | ret = parse_gw_bandwidth(net_dev, buff, &up, &down); | |
146 | if (!ret) | |
147 | goto end; | |
148 | ||
149 | if ((!down) || (down < 256)) | |
150 | down = 2000; | |
151 | ||
152 | if (!up) | |
153 | up = down / 5; | |
154 | ||
155 | kbit_to_gw_bandwidth(down, up, &gw_bandwidth_tmp); | |
156 | ||
9cfc7bd6 | 157 | /* the gw bandwidth we guessed above might not match the given |
c6c8fea2 SE |
158 | * speeds, hence we need to calculate it back to show the number |
159 | * that is going to be propagated | |
9cfc7bd6 | 160 | */ |
84d5e5e0 | 161 | batadv_gw_bandwidth_to_kbit((uint8_t)gw_bandwidth_tmp, &down, &up); |
c6c8fea2 | 162 | |
dafe94b2 ML |
163 | if (atomic_read(&bat_priv->gw_bandwidth) == gw_bandwidth_tmp) |
164 | return count; | |
165 | ||
7cf06bc6 | 166 | batadv_gw_deselect(bat_priv); |
86ceb360 SE |
167 | bat_info(net_dev, |
168 | "Changing gateway bandwidth from: '%i' to: '%ld' (propagating: %d%s/%d%s)\n", | |
c6c8fea2 SE |
169 | atomic_read(&bat_priv->gw_bandwidth), gw_bandwidth_tmp, |
170 | (down > 2048 ? down / 1024 : down), | |
171 | (down > 2048 ? "MBit" : "KBit"), | |
172 | (up > 2048 ? up / 1024 : up), | |
173 | (up > 2048 ? "MBit" : "KBit")); | |
174 | ||
175 | atomic_set(&bat_priv->gw_bandwidth, gw_bandwidth_tmp); | |
176 | ||
177 | end: | |
178 | return count; | |
179 | } |