drivers/net/wireless/mediatek/mt76/mt76_connac3_mac.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/mediatek/mt76/mt76_connac3_mac.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/mediatek/mt76/mt76_connac3_mac.c
Extension
.c
Size
8931 bytes
Lines
269
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: BSD-3-Clause-Clear
/* Copyright (C) 2023 MediaTek Inc. */

#include "mt76_connac.h"
#include "mt76_connac3_mac.h"
#include "dma.h"

#define HE_BITS(f)		cpu_to_le16(IEEE80211_RADIOTAP_HE_##f)
#define EHT_BITS(f)		cpu_to_le32(IEEE80211_RADIOTAP_EHT_##f)
#define HE_PREP(f, m, v)	le16_encode_bits(le32_get_bits(v, MT_CRXV_HE_##m),\
						 IEEE80211_RADIOTAP_HE_##f)
#define EHT_PREP(f, m, v)	le32_encode_bits(le32_get_bits(v, MT_CRXV_EHT_##m),\
						 IEEE80211_RADIOTAP_EHT_##f)

static void
mt76_connac3_mac_decode_he_radiotap_ru(struct mt76_rx_status *status,
				       struct ieee80211_radiotap_he *he,
				       __le32 *rxv)
{
	u32 ru = le32_get_bits(rxv[0], MT_PRXV_HE_RU_ALLOC), offs = 0;

	status->bw = RATE_INFO_BW_HE_RU;

	switch (ru) {
	case 0 ... 36:
		status->he_ru = NL80211_RATE_INFO_HE_RU_ALLOC_26;
		offs = ru;
		break;
	case 37 ... 52:
		status->he_ru = NL80211_RATE_INFO_HE_RU_ALLOC_52;
		offs = ru - 37;
		break;
	case 53 ... 60:
		status->he_ru = NL80211_RATE_INFO_HE_RU_ALLOC_106;
		offs = ru - 53;
		break;
	case 61 ... 64:
		status->he_ru = NL80211_RATE_INFO_HE_RU_ALLOC_242;
		offs = ru - 61;
		break;
	case 65 ... 66:
		status->he_ru = NL80211_RATE_INFO_HE_RU_ALLOC_484;
		offs = ru - 65;
		break;
	case 67:
		status->he_ru = NL80211_RATE_INFO_HE_RU_ALLOC_996;
		break;
	case 68:
		status->he_ru = NL80211_RATE_INFO_HE_RU_ALLOC_2x996;
		break;
	}

	he->data1 |= HE_BITS(DATA1_BW_RU_ALLOC_KNOWN);
	he->data2 |= HE_BITS(DATA2_RU_OFFSET_KNOWN) |
		     le16_encode_bits(offs,
				      IEEE80211_RADIOTAP_HE_DATA2_RU_OFFSET);
}

#define MU_PREP(f, v)	le16_encode_bits(v, IEEE80211_RADIOTAP_HE_MU_##f)
static void
mt76_connac3_mac_decode_he_mu_radiotap(struct sk_buff *skb, __le32 *rxv)
{
	struct mt76_rx_status *status = (struct mt76_rx_status *)skb->cb;
	static const struct ieee80211_radiotap_he_mu mu_known = {
		.flags1 = HE_BITS(MU_FLAGS1_SIG_B_MCS_KNOWN) |
			  HE_BITS(MU_FLAGS1_SIG_B_DCM_KNOWN) |
			  HE_BITS(MU_FLAGS1_CH1_RU_KNOWN) |
			  HE_BITS(MU_FLAGS1_SIG_B_SYMS_USERS_KNOWN),
		.flags2 = HE_BITS(MU_FLAGS2_BW_FROM_SIG_A_BW_KNOWN),
	};
	struct ieee80211_radiotap_he_mu *he_mu;

	status->flag |= RX_FLAG_RADIOTAP_HE_MU;

	he_mu = skb_push(skb, sizeof(mu_known));
	memcpy(he_mu, &mu_known, sizeof(mu_known));

	he_mu->flags1 |= MU_PREP(FLAGS1_SIG_B_MCS, status->rate_idx);
	if (status->he_dcm)
		he_mu->flags1 |= MU_PREP(FLAGS1_SIG_B_DCM, status->he_dcm);

	he_mu->flags2 |= MU_PREP(FLAGS2_BW_FROM_SIG_A_BW, status->bw) |
			 MU_PREP(FLAGS2_SIG_B_SYMS_USERS,
				 le32_get_bits(rxv[4], MT_CRXV_HE_NUM_USER));

	he_mu->ru_ch1[0] = le32_get_bits(rxv[16], MT_CRXV_HE_RU0) & 0xff;

	if (status->bw >= RATE_INFO_BW_40) {
		he_mu->flags1 |= HE_BITS(MU_FLAGS1_CH2_RU_KNOWN);
		he_mu->ru_ch2[0] = le32_get_bits(rxv[16], MT_CRXV_HE_RU1) & 0xff;

Annotation

Implementation Notes