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Decode SNR in Compressed MIMO Beamforming report per ieee80211at_2013 sections 8.4.1.{29,48} 

Change-Id: I4f3af7e06169461a15507ed8ecce8f15075b9667
Reviewed-on: https://code.wireshark.org/review/23835
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>
This commit is contained in:
Jason Uher 2017-10-04 11:46:00 -04:00 committed by Michael Mann
parent 6ef693dec1
commit 95c50e3dd7
1 changed files with 30 additions and 8 deletions
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38
epan/dissectors/packet-ieee80211.c
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@ -5625,11 +5625,21 @@ add_mimo_compressed_beamforming_feedback_report(proto_tree *tree, tvbuff_t *tvb,
for (i = 1; i <= mimo_cntrl.nc; i++)
{
guint8 snr;
gint8 snr;
char edge_sign;
snr = tvb_get_guint8(tvb, offset);
snr = (gint8) tvb_get_guint8(tvb, offset);
switch(snr) {
case -128:
edge_sign = '<';
case 127:
edge_sign = '>';
default:
edge_sign = ' ';
}
proto_tree_add_uint_format(snr_tree, hf_ieee80211_ff_mimo_csi_snr, tvb, offset, 1,
snr, "Stream %d - Signal to Noise Ratio: 0x%02X", i, snr);
snr, "Stream %d - Signal to Noise Ratio: %c%3.2fdB", i, edge_sign,snr/4.0+22.0);
offset += 1;
}
@ -9484,11 +9494,23 @@ add_ff_vht_compressed_beamforming_report(proto_tree *tree, tvbuff_t *tvb, packet
for (i = 1; i <= nc; i++)
{
guint8 snr;
gint8 snr;
char edge_sign;
snr = (gint8) tvb_get_guint8(tvb, offset);
switch(snr) {
case -128:
edge_sign = '<';
case 127:
edge_sign = '>';
default:
edge_sign = ' ';
}
proto_tree_add_int_format(subtree, hf_ieee80211_vht_compressed_beamforming_report_snr, tvb, offset, 1,
snr, "Stream %d - Signal to Noise Ratio: %c%3.2fdB", i, edge_sign,snr/4.0+22.0);
snr = tvb_get_guint8(tvb, offset);
proto_tree_add_uint_format(subtree, hf_ieee80211_vht_compressed_beamforming_report_snr, tvb, offset, 1,
snr, "Stream %d - Signal to Noise Ratio: 0x%02X", i, snr);
offset += 1;
}
@ -21715,7 +21737,7 @@ proto_register_ieee80211(void)
{&hf_ieee80211_vht_compressed_beamforming_report_snr,
{"Signal to Noise Ratio (SNR)", "wlan.vht.compressed_beamforming_report.snr",
FT_UINT8, BASE_HEX, NULL, 0,
FT_INT8, BASE_DEC, NULL, 0,
NULL, HFILL }},
{&hf_ieee80211_vht_compressed_beamforming_phi_angle,