recipes-wifi/linux-mt76/files/patches-3.x/2007-mtk-wifi-mt76-mt7915-wed-find-rx-token-by-physical-a.patch

From 3fd9079da8481df27e2ce65a99e3638bae6c7a33 Mon Sep 17 00:00:00 2001
From: "sujuan.chen" <sujuan.chen@mediatek.com>
Date: Wed, 19 Jul 2023 10:55:09 +0800
Subject: [PATCH 2007/2032] mtk: wifi: mt76: mt7915: wed: find rx token by
 physical address

The token id in RxDMAD may be incorrect when it is not the last frame due to
WED HW bug. Lookup correct token id by physical address in sdp0.
Add len == 0 check to drop garbage frames

Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
---
 dma.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/dma.c b/dma.c
index 89ae929f..6bfcee1a 100644
--- a/dma.c
+++ b/dma.c
@@ -446,9 +446,32 @@ mt76_dma_get_buf(struct mt76_dev *dev, struct mt76_queue *q, int idx,
 	mt76_dma_should_drop_buf(drop, ctrl, buf1, desc_info);
 
 	if (mt76_queue_is_wed_rx(q)) {
+		u32 id, find = 0;
 		u32 token = FIELD_GET(MT_DMA_CTL_TOKEN, buf1);
-		struct mt76_rxwi_cache *r = mt76_rx_token_release(dev, token);
+		struct mt76_rxwi_cache *r;
+
+		if (*more) {
+			spin_lock_bh(&dev->rx_token_lock);
+
+			idr_for_each_entry(&dev->rx_token, r, id) {
+				if (r->dma_addr == le32_to_cpu(desc->buf0)) {
+					find = 1;
+					token = id;
+
+					/* Write correct id back to DMA*/
+					u32p_replace_bits(&buf1, id,
+							  MT_DMA_CTL_TOKEN);
+					WRITE_ONCE(desc->buf1, cpu_to_le32(buf1));
+					break;
+				}
+			}
 
+			spin_unlock_bh(&dev->rx_token_lock);
+			if (!find)
+				return NULL;
+		}
+
+		r = mt76_rx_token_release(dev, token);
 		if (!r)
 			return NULL;
 
@@ -901,7 +924,7 @@ mt76_dma_rx_process(struct mt76_dev *dev, struct mt76_queue *q, int budget)
 		if (!data)
 			break;
 
-		if (drop)
+		if (drop || (len == 0))
 			goto free_frag;
 
 		if (q->rx_head)
-- 
2.18.0