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mac80211: support Rx timestamp calculation for all preamble types 

Add support for calculating the Rx timestamp for HE frames.
Since now all frame types are supported, allow setting the Rx
timestamp regardless of the frame type.

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20201206145305.4786559af475.Ia54486bb0a12e5351f9d5c60ef6fcda7c9e7141c@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Avraham Stern 2020-12-06 14:54:45 +02:00 committed by Johannes Berg
parent f65607cdbc
commit da3882331a
2 changed files with 67 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
net/mac80211/ieee80211_i.h
View File

@ -1589,13 +1589,8 @@ ieee80211_have_rx_timestamp(struct ieee80211_rx_status *status)
{
WARN_ON_ONCE(status->flag & RX_FLAG_MACTIME_START &&
status->flag & RX_FLAG_MACTIME_END);
if (status->flag & (RX_FLAG_MACTIME_START | RX_FLAG_MACTIME_END))
return true;
/* can't handle non-legacy preamble yet */
if (status->flag & RX_FLAG_MACTIME_PLCP_START &&
status->encoding == RX_ENC_LEGACY)
return true;
return false;
return !!(status->flag & (RX_FLAG_MACTIME_START | RX_FLAG_MACTIME_END |
RX_FLAG_MACTIME_PLCP_START));
}
void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata);

66
net/mac80211/util.c
View File

@ -3666,6 +3666,7 @@ u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
u64 ts = status->mactime;
struct rate_info ri;
u16 rate;
u8 n_ltf;
if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
return 0;
@ -3676,11 +3677,58 @@ u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
/* Fill cfg80211 rate info */
switch (status->encoding) {
case RX_ENC_HE:
ri.flags |= RATE_INFO_FLAGS_HE_MCS;
ri.mcs = status->rate_idx;
ri.nss = status->nss;
ri.he_ru_alloc = status->he_ru;
if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
/*
* See P802.11ax_D6.0, section 27.3.4 for
* VHT PPDU format.
*/
if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
mpdu_offset += 2;
ts += 36;
/*
* TODO:
* For HE MU PPDU, add the HE-SIG-B.
* For HE ER PPDU, add 8us for the HE-SIG-A.
* For HE TB PPDU, add 4us for the HE-STF.
* Add the HE-LTF durations - variable.
*/
}
break;
case RX_ENC_HT:
ri.mcs = status->rate_idx;
ri.flags |= RATE_INFO_FLAGS_MCS;
if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
/*
* See P802.11REVmd_D3.0, section 19.3.2 for
* HT PPDU format.
*/
if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
mpdu_offset += 2;
if (status->enc_flags & RX_ENC_FLAG_HT_GF)
ts += 24;
else
ts += 32;
/*
* Add Data HT-LTFs per streams
* TODO: add Extension HT-LTFs, 4us per LTF
*/
n_ltf = ((ri.mcs >> 3) & 3) + 1;
n_ltf = n_ltf == 3 ? 4 : n_ltf;
ts += n_ltf * 4;
}
break;
case RX_ENC_VHT:
ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
@ -3688,6 +3736,23 @@ u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
ri.nss = status->nss;
if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
/*
* See P802.11REVmd_D3.0, section 21.3.2 for
* VHT PPDU format.
*/
if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
mpdu_offset += 2;
ts += 36;
/*
* Add VHT-LTFs per streams
*/
n_ltf = (ri.nss != 1) && (ri.nss % 2) ?
ri.nss + 1 : ri.nss;
ts += 4 * n_ltf;
}
break;
default:
WARN_ON(1);
@ -3711,7 +3776,6 @@ u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
/* TODO: handle HT/VHT preambles */
if (status->band == NL80211_BAND_5GHZ) {
ts += 20 << shift;
mpdu_offset += 2;