Commit da388233 authored by Avraham Stern's avatar Avraham Stern Committed by Johannes Berg
Browse files

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: default avatarAvraham Stern <avraham.stern@intel.com>
Signed-off-by: default avatarLuca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20201206145305.4786559af475.Ia54486bb0a12e5351f9d5c60ef6fcda7c9e7141c@changeid


Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent f65607cd

net/mac80211/ieee80211_i.h

+2 −7
Original line number Diff line number Diff line
@@ -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);

net/mac80211/util.c

+65 −1
Original line number Diff line number Diff line
@@ -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;

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