wifi: mt76: add tx checksum offload for mt7915 and mt7921

Supports IPv4 and IPv6 TCP + UDP

Signed-off-by: Felix Fietkau <[email protected]>

mt76_connac_mac.c

@@ -337,6 +337,9 @@ mt76_connac2_mac_write_txwi_8023(__le32 *txwi, struct sk_buff *skb,
 		wmm = sta->wme;
 	}
 
+	val = FIELD_PREP(MT_TXD0_ETH_TYPE_OFFSET, 10);
+	txwi[0] |= cpu_to_le32(val);
+
 	val = FIELD_PREP(MT_TXD1_HDR_FORMAT, MT_HDR_FORMAT_802_3) |
 	      FIELD_PREP(MT_TXD1_TID, tid);
 
@@ -356,6 +359,8 @@ mt76_connac2_mac_write_txwi_8023(__le32 *txwi, struct sk_buff *skb,
 
 	val = FIELD_PREP(MT_TXD7_TYPE, fc_type) |
 	      FIELD_PREP(MT_TXD7_SUB_TYPE, fc_stype);
+	if (skb->ip_summed == CHECKSUM_PARTIAL)
+		val |= MT_TXD7_IP_SUM | MT_TXD7_UDP_TCP_SUM;
 
 	txwi[7] |= cpu_to_le32(val);
 }

mt7915/init.c

@@ -329,7 +329,9 @@ mt7915_init_wiphy(struct ieee80211_hw *hw)
 	hw->queues = 4;
 	hw->max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HE;
 	hw->max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HE;
-	hw->netdev_features = NETIF_F_RXCSUM | NETIF_F_SG;
+	hw->netdev_features = NETIF_F_RXCSUM | NETIF_F_SG |
+			      NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
+			      NETIF_F_GSO_SOFTWARE;
 
 	hw->radiotap_timestamp.units_pos =
 		IEEE80211_RADIOTAP_TIMESTAMP_UNIT_US;

mt7915/main.c

@@ -248,9 +248,13 @@ static int mt7915_add_interface(struct ieee80211_hw *hw,
 		mtxq->wcid = idx;
 	}
 
+	vif->netdev_features &= ~NETIF_F_GSO_SOFTWARE;
 	if (vif->type != NL80211_IFTYPE_AP &&
-	    (!mvif->mt76.omac_idx || mvif->mt76.omac_idx > 3))
+	    (!mvif->mt76.omac_idx || mvif->mt76.omac_idx > 3)) {
 		vif->offload_flags = 0;
+		vif->netdev_features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
+	}
+
 	vif->offload_flags |= IEEE80211_OFFLOAD_ENCAP_4ADDR;
 
 	mt7915_init_bitrate_mask(vif);

mt7921/init.c

@@ -55,7 +55,9 @@ mt7921_init_wiphy(struct ieee80211_hw *hw)
 	hw->queues = 4;
 	hw->max_rx_aggregation_subframes = 256;
 	hw->max_tx_aggregation_subframes = 256;
-	hw->netdev_features = NETIF_F_RXCSUM;
+	hw->netdev_features = NETIF_F_RXCSUM |
+			      NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
+			      NETIF_F_GSO_SOFTWARE;
 	if (mt76_is_mmio(&dev->mt76))
 		hw->netdev_features |= NETIF_F_SG;
 

mt7921/main.c

@@ -352,6 +352,7 @@ static int mt7921_add_interface(struct ieee80211_hw *hw,
 	}
 
 	vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;
+	vif->netdev_features &= ~NETIF_F_GSO_SOFTWARE;
 out:
 	mt7921_mutex_release(dev);
 

tx.c

@@ -312,16 +312,18 @@ mt76_tx(struct mt76_phy *phy, struct ieee80211_sta *sta,
 	struct mt76_queue *q;
 	int qid = skb_get_queue_mapping(skb);
 
-	if (mt76_testmode_enabled(phy)) {
+	if (mt76_testmode_enabled(phy))
-		ieee80211_free_txskb(phy->hw, skb);
+		goto free;
-		return;
-	}
 
 	if (WARN_ON(qid >= MT_TXQ_PSD)) {
 		qid = MT_TXQ_BE;
 		skb_set_queue_mapping(skb, qid);
 	}
 
+	if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
+	    skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_help(skb))
+		goto free;
+
 	if ((dev->drv->drv_flags & MT_DRV_HW_MGMT_TXQ) &&
 	    !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
 	    !ieee80211_is_data(hdr->frame_control) &&
@@ -340,6 +342,10 @@ mt76_tx(struct mt76_phy *phy, struct ieee80211_sta *sta,
 	__mt76_tx_queue_skb(phy, qid, skb, wcid, sta, NULL);
 	dev->queue_ops->kick(dev, q);
 	spin_unlock_bh(&q->lock);
+	return;
+
+free:
+	ieee80211_free_txskb(phy->hw, skb);
 }
 EXPORT_SYMBOL_GPL(mt76_tx);