wifi: ath12k: dynamic VLAN support

Add support for dynamic VLAN. VLAN group traffic is encapsulated and
encrypted in mac80211 and driver needs to set flags for the VLAN group
traffic to skip hardware encapsulation and encryption.

VLAN group traffic utilizes ext MSDU and HTT Metadata to set
encapsulation type to RAW and encryption type to OPEN in order to
inform firmware to skip hardware encapsulation and encryption.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
Signed-off-by: Muna Sinada <quic_msinada@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240515192830.995013-1-quic_msinada@quicinc.com

drivers/net/wireless/ath/ath12k/dp_tx.c

@@ -124,6 +124,44 @@ static void ath12k_hal_tx_cmd_ext_desc_setup(struct ath12k_base *ab,
 						 HAL_TX_MSDU_EXT_INFO1_ENCRYPT_TYPE);
 }
 
+#define HTT_META_DATA_ALIGNMENT 0x8
+
+static void *ath12k_dp_metadata_align_skb(struct sk_buff *skb, u8 tail_len)
+{
+	struct sk_buff *tail;
+	void *metadata;
+
+	if (unlikely(skb_cow_data(skb, tail_len, &tail) < 0))
+		return NULL;
+
+	metadata = pskb_put(skb, tail, tail_len);
+	memset(metadata, 0, tail_len);
+	return metadata;
+}
+
+/* Preparing HTT Metadata when utilized with ext MSDU */
+static int ath12k_dp_prepare_htt_metadata(struct sk_buff *skb)
+{
+	struct hal_tx_msdu_metadata *desc_ext;
+	u8 htt_desc_size;
+	/* Size rounded of multiple of 8 bytes */
+	u8 htt_desc_size_aligned;
+
+	htt_desc_size = sizeof(struct hal_tx_msdu_metadata);
+	htt_desc_size_aligned = ALIGN(htt_desc_size, HTT_META_DATA_ALIGNMENT);
+
+	desc_ext = ath12k_dp_metadata_align_skb(skb, htt_desc_size_aligned);
+	if (!desc_ext)
+		return -ENOMEM;
+
+	desc_ext->info0 = le32_encode_bits(1, HAL_TX_MSDU_METADATA_INFO0_ENCRYPT_FLAG) |
+			  le32_encode_bits(0, HAL_TX_MSDU_METADATA_INFO0_ENCRYPT_TYPE) |
+			  le32_encode_bits(1,
+					   HAL_TX_MSDU_METADATA_INFO0_HOST_TX_DESC_POOL);
+
+	return 0;
+}
+
 int ath12k_dp_tx(struct ath12k *ar, struct ath12k_vif *arvif,
 		 struct sk_buff *skb)
 {
@@ -145,6 +183,7 @@ int ath12k_dp_tx(struct ath12k *ar, struct ath12k_vif *arvif,
 	u8 ring_selector, ring_map = 0;
 	bool tcl_ring_retry;
 	bool msdu_ext_desc = false;
+	bool add_htt_metadata = false;
 
 	if (test_bit(ATH12K_FLAG_CRASH_FLUSH, &ar->ab->dev_flags))
 		return -ESHUTDOWN;
@@ -248,6 +287,18 @@ int ath12k_dp_tx(struct ath12k *ar, struct ath12k_vif *arvif,
 		goto fail_remove_tx_buf;
 	}
 
+	if (!test_bit(ATH12K_FLAG_HW_CRYPTO_DISABLED, &ar->ab->dev_flags) &&
+	    !(skb_cb->flags & ATH12K_SKB_HW_80211_ENCAP) &&
+	    !(skb_cb->flags & ATH12K_SKB_CIPHER_SET) &&
+	    ieee80211_has_protected(hdr->frame_control)) {
+		/* Add metadata for sw encrypted vlan group traffic */
+		add_htt_metadata = true;
+		msdu_ext_desc = true;
+		ti.flags0 |= u32_encode_bits(1, HAL_TCL_DATA_CMD_INFO2_TO_FW);
+		ti.encap_type = HAL_TCL_ENCAP_TYPE_RAW;
+		ti.encrypt_type = HAL_ENCRYPT_TYPE_OPEN;
+	}
+
 	tx_desc->skb = skb;
 	tx_desc->mac_id = ar->pdev_idx;
 	ti.desc_id = tx_desc->desc_id;
@@ -269,6 +320,15 @@ int ath12k_dp_tx(struct ath12k *ar, struct ath12k_vif *arvif,
 		msg = (struct hal_tx_msdu_ext_desc *)skb_ext_desc->data;
 		ath12k_hal_tx_cmd_ext_desc_setup(ab, msg, &ti);
 
+		if (add_htt_metadata) {
+			ret = ath12k_dp_prepare_htt_metadata(skb_ext_desc);
+			if (ret < 0) {
+				ath12k_dbg(ab, ATH12K_DBG_DP_TX,
+					   "Failed to add HTT meta data, dropping packet\n");
+				goto fail_unmap_dma;
+			}
+		}
+
 		ti.paddr = dma_map_single(ab->dev, skb_ext_desc->data,
 					  skb_ext_desc->len, DMA_TO_DEVICE);
 		ret = dma_mapping_error(ab->dev, ti.paddr);

drivers/net/wireless/ath/ath12k/hal_desc.h

@@ -2984,4 +2984,29 @@ struct hal_mon_dest_desc {
  *	updated by SRNG.
  */
 
+#define HAL_TX_MSDU_METADATA_INFO0_ENCRYPT_FLAG		BIT(8)
+#define HAL_TX_MSDU_METADATA_INFO0_ENCRYPT_TYPE		GENMASK(16, 15)
+#define HAL_TX_MSDU_METADATA_INFO0_HOST_TX_DESC_POOL	BIT(31)
+
+struct hal_tx_msdu_metadata {
+	__le32 info0;
+	__le32 rsvd0[6];
+} __packed;
+
+/* hal_tx_msdu_metadata
+ * valid_encrypt_type
+ *		if set, encrypt type is valid
+ * encrypt_type
+ *		0 = NO_ENCRYPT,
+ *		1 = ENCRYPT,
+ *		2 ~ 3 - Reserved
+ * host_tx_desc_pool
+ *		If set, Firmware allocates tx_descriptors
+ *		in WAL_BUFFERID_TX_HOST_DATA_EXP,instead
+ *		of WAL_BUFFERID_TX_TCL_DATA_EXP.
+ *		Use cases:
+ *		Any time firmware uses TQM-BYPASS for Data
+ *		TID, firmware expect host to set this bit.
+ */
+
 #endif /* ATH12K_HAL_DESC_H */

drivers/net/wireless/ath/ath12k/hw.c

@@ -891,7 +891,8 @@ static const struct ath12k_hw_params ath12k_hw_params[] = {
 
 		.interface_modes = BIT(NL80211_IFTYPE_STATION) |
 					BIT(NL80211_IFTYPE_AP) |
-					BIT(NL80211_IFTYPE_MESH_POINT),
+					BIT(NL80211_IFTYPE_MESH_POINT) |
+					BIT(NL80211_IFTYPE_AP_VLAN),
 		.supports_monitor = false,
 
 		.idle_ps = false,
@@ -1038,7 +1039,8 @@ static const struct ath12k_hw_params ath12k_hw_params[] = {
 
 		.interface_modes = BIT(NL80211_IFTYPE_STATION) |
 					BIT(NL80211_IFTYPE_AP) |
-					BIT(NL80211_IFTYPE_MESH_POINT),
+					BIT(NL80211_IFTYPE_MESH_POINT) |
+					BIT(NL80211_IFTYPE_AP_VLAN),
 		.supports_monitor = false,
 
 		.idle_ps = false,