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135 lines
3.8 KiB
Diff
135 lines
3.8 KiB
Diff
From: Avraham Stern <avraham.stern@intel.com>
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Date: Sun, 6 Dec 2020 14:54:45 +0200
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Subject: [PATCH] mac80211: support Rx timestamp calculation for all preamble
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types
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Add support for calculating the Rx timestamp for HE frames.
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Since now all frame types are supported, allow setting the Rx
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timestamp regardless of the frame type.
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Signed-off-by: Avraham Stern <avraham.stern@intel.com>
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Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
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Link: https://lore.kernel.org/r/iwlwifi.20201206145305.4786559af475.Ia54486bb0a12e5351f9d5c60ef6fcda7c9e7141c@changeid
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Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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---
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--- a/net/mac80211/ieee80211_i.h
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+++ b/net/mac80211/ieee80211_i.h
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@@ -1600,13 +1600,8 @@ ieee80211_have_rx_timestamp(struct ieee8
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{
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WARN_ON_ONCE(status->flag & RX_FLAG_MACTIME_START &&
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status->flag & RX_FLAG_MACTIME_END);
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- if (status->flag & (RX_FLAG_MACTIME_START | RX_FLAG_MACTIME_END))
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- return true;
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- /* can't handle non-legacy preamble yet */
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- if (status->flag & RX_FLAG_MACTIME_PLCP_START &&
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- status->encoding == RX_ENC_LEGACY)
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- return true;
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- return false;
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+ return !!(status->flag & (RX_FLAG_MACTIME_START | RX_FLAG_MACTIME_END |
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+ RX_FLAG_MACTIME_PLCP_START));
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}
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void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata);
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--- a/net/mac80211/util.c
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+++ b/net/mac80211/util.c
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@@ -3665,6 +3665,7 @@ u64 ieee80211_calculate_rx_timestamp(str
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u64 ts = status->mactime;
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struct rate_info ri;
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u16 rate;
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+ u8 n_ltf;
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if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
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return 0;
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@@ -3675,11 +3676,58 @@ u64 ieee80211_calculate_rx_timestamp(str
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/* Fill cfg80211 rate info */
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switch (status->encoding) {
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+ case RX_ENC_HE:
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+ ri.flags |= RATE_INFO_FLAGS_HE_MCS;
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+ ri.mcs = status->rate_idx;
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+ ri.nss = status->nss;
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+ ri.he_ru_alloc = status->he_ru;
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+ if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
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+ ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
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+
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+ /*
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+ * See P802.11ax_D6.0, section 27.3.4 for
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+ * VHT PPDU format.
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+ */
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+ if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
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+ mpdu_offset += 2;
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+ ts += 36;
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+
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+ /*
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+ * TODO:
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+ * For HE MU PPDU, add the HE-SIG-B.
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+ * For HE ER PPDU, add 8us for the HE-SIG-A.
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+ * For HE TB PPDU, add 4us for the HE-STF.
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+ * Add the HE-LTF durations - variable.
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+ */
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+ }
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+
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+ break;
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case RX_ENC_HT:
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ri.mcs = status->rate_idx;
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ri.flags |= RATE_INFO_FLAGS_MCS;
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if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
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ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
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+
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+ /*
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+ * See P802.11REVmd_D3.0, section 19.3.2 for
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+ * HT PPDU format.
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+ */
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+ if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
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+ mpdu_offset += 2;
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+ if (status->enc_flags & RX_ENC_FLAG_HT_GF)
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+ ts += 24;
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+ else
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+ ts += 32;
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+
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+ /*
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+ * Add Data HT-LTFs per streams
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+ * TODO: add Extension HT-LTFs, 4us per LTF
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+ */
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+ n_ltf = ((ri.mcs >> 3) & 3) + 1;
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+ n_ltf = n_ltf == 3 ? 4 : n_ltf;
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+ ts += n_ltf * 4;
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+ }
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+
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break;
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case RX_ENC_VHT:
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ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
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@@ -3687,6 +3735,23 @@ u64 ieee80211_calculate_rx_timestamp(str
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ri.nss = status->nss;
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if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
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ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
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+
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+ /*
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+ * See P802.11REVmd_D3.0, section 21.3.2 for
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+ * VHT PPDU format.
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+ */
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+ if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
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+ mpdu_offset += 2;
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+ ts += 36;
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+
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+ /*
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+ * Add VHT-LTFs per streams
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+ */
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+ n_ltf = (ri.nss != 1) && (ri.nss % 2) ?
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+ ri.nss + 1 : ri.nss;
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+ ts += 4 * n_ltf;
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+ }
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+
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break;
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default:
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WARN_ON(1);
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@@ -3710,7 +3775,6 @@ u64 ieee80211_calculate_rx_timestamp(str
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ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
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if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
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- /* TODO: handle HT/VHT preambles */
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if (status->band == NL80211_BAND_5GHZ) {
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ts += 20 << shift;
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mpdu_offset += 2;
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