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64afe35398
Signed-off-by: Sven Eckelmann <sven@narfation.org>
178 lines
4.1 KiB
C
178 lines
4.1 KiB
C
/*
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* Copyright (C) 2009-2011 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#include "main.h"
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#include "gateway_common.h"
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#include "gateway_client.h"
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/* calculates the gateway class from kbit */
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static void kbit_to_gw_bandwidth(int down, int up, long *gw_srv_class)
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{
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int mdown = 0, tdown, tup, difference;
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uint8_t sbit, part;
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*gw_srv_class = 0;
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difference = 0x0FFFFFFF;
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/* test all downspeeds */
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for (sbit = 0; sbit < 2; sbit++) {
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for (part = 0; part < 16; part++) {
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tdown = 32 * (sbit + 2) * (1 << part);
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if (abs(tdown - down) < difference) {
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*gw_srv_class = (sbit << 7) + (part << 3);
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difference = abs(tdown - down);
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mdown = tdown;
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}
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}
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}
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/* test all upspeeds */
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difference = 0x0FFFFFFF;
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for (part = 0; part < 8; part++) {
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tup = ((part + 1) * (mdown)) / 8;
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if (abs(tup - up) < difference) {
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*gw_srv_class = (*gw_srv_class & 0xF8) | part;
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difference = abs(tup - up);
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}
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}
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}
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/* returns the up and downspeeds in kbit, calculated from the class */
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void gw_bandwidth_to_kbit(uint8_t gw_srv_class, int *down, int *up)
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{
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char sbit = (gw_srv_class & 0x80) >> 7;
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char dpart = (gw_srv_class & 0x78) >> 3;
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char upart = (gw_srv_class & 0x07);
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if (!gw_srv_class) {
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*down = 0;
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*up = 0;
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return;
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}
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*down = 32 * (sbit + 2) * (1 << dpart);
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*up = ((upart + 1) * (*down)) / 8;
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}
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static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff,
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long *up, long *down)
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{
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int ret, multi = 1;
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char *slash_ptr, *tmp_ptr;
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slash_ptr = strchr(buff, '/');
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if (slash_ptr)
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*slash_ptr = 0;
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if (strlen(buff) > 4) {
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tmp_ptr = buff + strlen(buff) - 4;
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if (strnicmp(tmp_ptr, "mbit", 4) == 0)
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multi = 1024;
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if ((strnicmp(tmp_ptr, "kbit", 4) == 0) ||
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(multi > 1))
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*tmp_ptr = '\0';
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}
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ret = strict_strtoul(buff, 10, down);
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if (ret) {
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bat_err(net_dev,
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"Download speed of gateway mode invalid: %s\n",
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buff);
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return false;
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}
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*down *= multi;
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/* we also got some upload info */
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if (slash_ptr) {
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multi = 1;
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if (strlen(slash_ptr + 1) > 4) {
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tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1);
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if (strnicmp(tmp_ptr, "mbit", 4) == 0)
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multi = 1024;
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if ((strnicmp(tmp_ptr, "kbit", 4) == 0) ||
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(multi > 1))
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*tmp_ptr = '\0';
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}
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ret = strict_strtoul(slash_ptr + 1, 10, up);
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if (ret) {
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bat_err(net_dev,
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"Upload speed of gateway mode invalid: "
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"%s\n", slash_ptr + 1);
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return false;
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}
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*up *= multi;
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}
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return true;
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}
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ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count)
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{
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struct bat_priv *bat_priv = netdev_priv(net_dev);
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long gw_bandwidth_tmp = 0, up = 0, down = 0;
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bool ret;
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ret = parse_gw_bandwidth(net_dev, buff, &up, &down);
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if (!ret)
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goto end;
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if ((!down) || (down < 256))
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down = 2000;
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if (!up)
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up = down / 5;
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kbit_to_gw_bandwidth(down, up, &gw_bandwidth_tmp);
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/**
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* the gw bandwidth we guessed above might not match the given
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* speeds, hence we need to calculate it back to show the number
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* that is going to be propagated
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**/
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gw_bandwidth_to_kbit((uint8_t)gw_bandwidth_tmp,
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(int *)&down, (int *)&up);
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gw_deselect(bat_priv);
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bat_info(net_dev, "Changing gateway bandwidth from: '%i' to: '%ld' "
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"(propagating: %ld%s/%ld%s)\n",
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atomic_read(&bat_priv->gw_bandwidth), gw_bandwidth_tmp,
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(down > 2048 ? down / 1024 : down),
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(down > 2048 ? "MBit" : "KBit"),
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(up > 2048 ? up / 1024 : up),
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(up > 2048 ? "MBit" : "KBit"));
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atomic_set(&bat_priv->gw_bandwidth, gw_bandwidth_tmp);
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end:
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return count;
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}
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