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2005-02-07 Dan Williams <dcbw@redhat.com>

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* src/NetworkManagerWireless.c
		- (nm_wireless_qual_to_percent): Fix up wireless quality calculations
			to be in line with the WEXT quality specification


git-svn-id: http://svn-archive.gnome.org/svn/NetworkManager/trunk@413 4912f4e0-d625-0410-9fb7-b9a5a253dbdc
This commit is contained in:
Dan Williams
2005-02-07 22:31:22 +00:00
parent b2e89762c6
commit 1fd38eed9d
2 changed files with 70 additions and 28 deletions
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6
ChangeLog
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@@ -1,3 +1,9 @@
2005-02-07 Dan Williams <dcbw@redhat.com>
* src/NetworkManagerWireless.c
- (nm_wireless_qual_to_percent): Fix up wireless quality calculations
to be in line with the WEXT quality specification
2005-02-02 Dan Williams <dcbw@redhat.com> 2005-02-02 Dan Williams <dcbw@redhat.com>
Patch from Nathan Fredrickson <nathan@silverorange.com> Patch from Nathan Fredrickson <nathan@silverorange.com>

92
src/NetworkManagerWireless.c
View File

@@ -132,45 +132,81 @@ char *nm_wireless_128bit_key_from_passphrase (const char *passphrase)
*/ */
int nm_wireless_qual_to_percent (const struct iw_quality *qual, const struct iw_quality *max_qual, const struct iw_quality *avg_qual) int nm_wireless_qual_to_percent (const struct iw_quality *qual, const struct iw_quality *max_qual, const struct iw_quality *avg_qual)
{ {
int percent = -1; int percent = -1;
int level_percent = -1;
g_return_val_if_fail (qual != NULL, -1); g_return_val_if_fail (qual != NULL, -1);
g_return_val_if_fail (max_qual != NULL, -1); g_return_val_if_fail (max_qual != NULL, -1);
g_return_val_if_fail (avg_qual != NULL, -1); g_return_val_if_fail (avg_qual != NULL, -1);
/* Try using the card's idea of the signal quality first as long as it tells us what the max quality is */ /*
syslog (LOG_DEBUG, "QL: qual %d/%u/0x%X, level %d/%u/0x%X, noise %d/%u/0x%X ** MAX: qual %d/%u/0x%X, level %d/%u/0x%X, noise %d/%u/0x%X",
(__s8)qual->qual, qual->qual, qual->qual, (__s8)qual->level, qual->level, qual->level, (__s8)qual->noise, qual->noise, qual->noise,
(__s8)max_qual->qual, max_qual->qual, max_qual->qual, (__s8)max_qual->level, max_qual->level, max_qual->level, (__s8)max_qual->noise, max_qual->noise, max_qual->noise);
*/
/* Try using the card's idea of the signal quality first as long as it tells us what the max quality is.
* Drivers that fill in quality values MUST treat them as percentages, ie the "Link Quality" MUST be
* bounded by 0 and max_qual->qual, and MUST change in a linear fashion. Within those bounds, drivers
* are free to use whatever they want to calculate "Link Quality".
*/
if ((max_qual->qual != 0) && !(max_qual->updated & IW_QUAL_QUAL_INVALID) && !(qual->updated & IW_QUAL_QUAL_INVALID)) if ((max_qual->qual != 0) && !(max_qual->updated & IW_QUAL_QUAL_INVALID) && !(qual->updated & IW_QUAL_QUAL_INVALID))
{
percent = (int)(100 * ((double)qual->qual / (double)max_qual->qual)); percent = (int)(100 * ((double)qual->qual / (double)max_qual->qual));
}
else /* If the driver doesn't specify a complete and valid quality, we have two options:
*
* 1) dBm: driver must specify max_qual->level = 0, and have valid values for
* qual->level and (qual->noise OR max_qual->noise)
* 2) raw RSSI: driver must specify max_qual->level > 0, and have valid values for
* qual->level and max_qual->level
*
* This is the WEXT spec. If this interpretation is wrong, I'll fix it. Otherwise,
* If drivers don't conform to it, they are wrong and need to be fixed.
*/
/* Absolute power values (dBm) */
if ( (max_qual->level == 0) && !(max_qual->updated & IW_QUAL_LEVEL_INVALID) /* Valid max_qual->level == 0 */
&& !(qual->updated & IW_QUAL_LEVEL_INVALID) /* Must have valid qual->level */
&& ( ((max_qual->noise > 0) && !(max_qual->updated & IW_QUAL_NOISE_INVALID)) /* Must have valid max_qual->noise */
|| ((qual->noise > 0) && (!qual->updated & IW_QUAL_NOISE_INVALID))) /* OR valid qual->noise */
)
{ {
if((qual->level > max_qual->level) && (qual->noise != 0)) /* Reasonable fallbacks for dumb drivers that don't specify either level. */
{ #define FALLBACK_NOISE_FLOOR_DBM -90
int level = -1; #define FALLBACK_SIGNAL_MAX_DBM -20
int noise = -1; int max_level = FALLBACK_SIGNAL_MAX_DBM;
int noise = FALLBACK_NOISE_FLOOR_DBM;
int level = qual->level - 0x100;
/* Signal level is in dBm (absolute power measurement) */ level = CLAMP (level, FALLBACK_NOISE_FLOOR_DBM, FALLBACK_SIGNAL_MAX_DBM);
if (!(qual->updated & IW_QUAL_LEVEL_INVALID))
level = qual->level - 0x100;
/* Deal with noise level in dBm (absolute power measurement) */ if ((qual->noise > 0) && (!qual->updated & IW_QUAL_NOISE_INVALID))
if (!(qual->updated & IW_QUAL_NOISE_INVALID)) noise = qual->noise - 0x100;
noise = qual->noise - 0x100; else if ((max_qual->noise > 0) && !(max_qual->updated & IW_QUAL_NOISE_INVALID))
noise = max_qual->noise - 0x100;
noise = CLAMP (noise, FALLBACK_NOISE_FLOOR_DBM, FALLBACK_SIGNAL_MAX_DBM);
/* Try a sort of signal-to-noise ratio */ /* A sort of signal-to-noise ratio calculation */
percent = abs((int)rint(10 * log ((double)level / ((double)level + (double)noise)))); level_percent = (int)(100 - 70 *(
} ((double)max_level - (double)level) /
else if (!(max_qual->level & IW_QUAL_LEVEL_INVALID) && (max_qual->level != 0)) ((double)max_level - (double)noise)));
{ /* syslog (LOG_DEBUG, "QL1: level_percent is %d. max_level %d, level %d, noise_floor %d.", level_percent, max_level, level, noise);*/
/* Signal level is relavtive (0 -> max) */ }
if (!(qual->updated & IW_QUAL_LEVEL_INVALID)) else if ((max_qual->level != 0) && !(max_qual->updated & IW_QUAL_LEVEL_INVALID) /* Valid max_qual->level as upper bound */
{ && !(qual->updated & IW_QUAL_LEVEL_INVALID))
percent = (int)(100 * ((double)qual->level / (double)max_qual->level)); {
} int level = qual->level;
}
/* Signal level is relavtive (0 -> max_qual->level) */
level = CLAMP (level, 0, max_qual->level);
level_percent = (int)(100 * ((double)level / (double)max_qual->level));
/* syslog (LOG_DEBUG, "QL2: level_percent is %d. max_level %d, level %d.", level_percent, max_qual->level, level);*/
} }
percent = CLAMP (percent, 0, 100); /* If the quality percent was 0 or doesn't exist, then try to use signal levels instead */
return (percent); if ((percent < 1) && (level_percent >= 0))
percent = level_percent;
/* syslog (LOG_DEBUG, "QL: Final quality %% is %d (%d).", percent, CLAMP (percent, 0, 100));*/
return (CLAMP (percent, 0, 100));
} }