Merge tag 'ath-current-20240812' of git://git.kernel.org/pub/scm/linux/kernel/git/ath/ath

ath.git patch for v6.11

We have a single patch for the next 6.11-rc which introduces a
workaround to ath12k which addresses a WCN7850 hardware issue that
prevents proper operation with unaligned transmit buffers.

Author: Kalle Valo

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

@@ -162,6 +162,60 @@ static int ath12k_dp_prepare_htt_metadata(struct sk_buff *skb)
 	return 0;
 }
 
+static void ath12k_dp_tx_move_payload(struct sk_buff *skb,
+				      unsigned long delta,
+				      bool head)
+{
+	unsigned long len = skb->len;
+
+	if (head) {
+		skb_push(skb, delta);
+		memmove(skb->data, skb->data + delta, len);
+		skb_trim(skb, len);
+	} else {
+		skb_put(skb, delta);
+		memmove(skb->data + delta, skb->data, len);
+		skb_pull(skb, delta);
+	}
+}
+
+static int ath12k_dp_tx_align_payload(struct ath12k_base *ab,
+				      struct sk_buff **pskb)
+{
+	u32 iova_mask = ab->hw_params->iova_mask;
+	unsigned long offset, delta1, delta2;
+	struct sk_buff *skb2, *skb = *pskb;
+	unsigned int headroom = skb_headroom(skb);
+	int tailroom = skb_tailroom(skb);
+	int ret = 0;
+
+	offset = (unsigned long)skb->data & iova_mask;
+	delta1 = offset;
+	delta2 = iova_mask - offset + 1;
+
+	if (headroom >= delta1) {
+		ath12k_dp_tx_move_payload(skb, delta1, true);
+	} else if (tailroom >= delta2) {
+		ath12k_dp_tx_move_payload(skb, delta2, false);
+	} else {
+		skb2 = skb_realloc_headroom(skb, iova_mask);
+		if (!skb2) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		dev_kfree_skb_any(skb);
+
+		offset = (unsigned long)skb2->data & iova_mask;
+		if (offset)
+			ath12k_dp_tx_move_payload(skb2, offset, true);
+		*pskb = skb2;
+	}
+
+out:
+	return ret;
+}
+
 int ath12k_dp_tx(struct ath12k *ar, struct ath12k_vif *arvif,
 		 struct sk_buff *skb)
 {
@@ -184,6 +238,7 @@ int ath12k_dp_tx(struct ath12k *ar, struct ath12k_vif *arvif,
 	bool tcl_ring_retry;
 	bool msdu_ext_desc = false;
 	bool add_htt_metadata = false;
+	u32 iova_mask = ab->hw_params->iova_mask;
 
 	if (test_bit(ATH12K_FLAG_CRASH_FLUSH, &ar->ab->dev_flags))
 		return -ESHUTDOWN;
@@ -279,6 +334,23 @@ int ath12k_dp_tx(struct ath12k *ar, struct ath12k_vif *arvif,
 		goto fail_remove_tx_buf;
 	}
 
+	if (iova_mask &&
+	    (unsigned long)skb->data & iova_mask) {
+		ret = ath12k_dp_tx_align_payload(ab, &skb);
+		if (ret) {
+			ath12k_warn(ab, "failed to align TX buffer %d\n", ret);
+			/* don't bail out, give original buffer
+			 * a chance even unaligned.
+			 */
+			goto map;
+		}
+
+		/* hdr is pointing to a wrong place after alignment,
+		 * so refresh it for later use.
+		 */
+		hdr = (void *)skb->data;
+	}
+map:
 	ti.paddr = dma_map_single(ab->dev, skb->data, skb->len, DMA_TO_DEVICE);
 	if (dma_mapping_error(ab->dev, ti.paddr)) {
 		atomic_inc(&ab->soc_stats.tx_err.misc_fail);

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

@@ -924,6 +924,8 @@ static const struct ath12k_hw_params ath12k_hw_params[] = {
 
 		.acpi_guid = NULL,
 		.supports_dynamic_smps_6ghz = true,
+
+		.iova_mask = 0,
 	},
 	{
 		.name = "wcn7850 hw2.0",
@@ -1000,6 +1002,8 @@ static const struct ath12k_hw_params ath12k_hw_params[] = {
 
 		.acpi_guid = &wcn7850_uuid,
 		.supports_dynamic_smps_6ghz = false,
+
+		.iova_mask = ATH12K_PCIE_MAX_PAYLOAD_SIZE - 1,
 	},
 	{
 		.name = "qcn9274 hw2.0",
@@ -1072,6 +1076,8 @@ static const struct ath12k_hw_params ath12k_hw_params[] = {
 
 		.acpi_guid = NULL,
 		.supports_dynamic_smps_6ghz = true,
+
+		.iova_mask = 0,
 	},
 };
 

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

@@ -96,6 +96,8 @@
 #define ATH12K_M3_FILE			"m3.bin"
 #define ATH12K_REGDB_FILE_NAME		"regdb.bin"
 
+#define ATH12K_PCIE_MAX_PAYLOAD_SIZE	128
+
 enum ath12k_hw_rate_cck {
 	ATH12K_HW_RATE_CCK_LP_11M = 0,
 	ATH12K_HW_RATE_CCK_LP_5_5M,
@@ -215,6 +217,8 @@ struct ath12k_hw_params {
 
 	const guid_t *acpi_guid;
 	bool supports_dynamic_smps_6ghz;
+
+	u32 iova_mask;
 };
 
 struct ath12k_hw_ops {

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

@@ -9193,6 +9193,7 @@ static int ath12k_mac_hw_register(struct ath12k_hw *ah)
 
 	hw->vif_data_size = sizeof(struct ath12k_vif);
 	hw->sta_data_size = sizeof(struct ath12k_sta);
+	hw->extra_tx_headroom = ab->hw_params->iova_mask;
 
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_STA_TX_PWR);