From bc98e7fdd80d215b4b55eea001023231eb8ce12e Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Wed, 20 Apr 2022 14:29:00 +0200 Subject: [PATCH] mt76: fix encap offload ethernet type check MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The driver needs to check if the format is 802.2 vs 802.3 in order to set a tx descriptor flag. skb->protocol can't be used, since it may not be properly initialized for packets coming in from a packet socket. Fix misdetection by checking the ethertype from the skb data instead Reported-by: Thibaut VARÈNE Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/mt7915/mac.c | 4 +++- drivers/net/wireless/mediatek/mt76/mt7921/mac.c | 4 +++- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c index 9c1421884435b..94a1871fbf431 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c @@ -1016,6 +1016,7 @@ mt7915_mac_write_txwi_8023(struct mt7915_dev *dev, __le32 *txwi, u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; u8 fc_type, fc_stype; + u16 ethertype; bool wmm = false; u32 val; @@ -1029,7 +1030,8 @@ mt7915_mac_write_txwi_8023(struct mt7915_dev *dev, __le32 *txwi, val = FIELD_PREP(MT_TXD1_HDR_FORMAT, MT_HDR_FORMAT_802_3) | FIELD_PREP(MT_TXD1_TID, tid); - if (be16_to_cpu(skb->protocol) >= ETH_P_802_3_MIN) + ethertype = get_unaligned_be16(&skb->data[12]); + if (ethertype >= ETH_P_802_3_MIN) val |= MT_TXD1_ETH_802_3; txwi[1] |= cpu_to_le32(val); diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c index 0c4ee3ffa0bbf..e67c3d17d36c8 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c @@ -814,6 +814,7 @@ mt7921_mac_write_txwi_8023(struct mt7921_dev *dev, __le32 *txwi, { u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; u8 fc_type, fc_stype; + u16 ethertype; bool wmm = false; u32 val; @@ -827,7 +828,8 @@ mt7921_mac_write_txwi_8023(struct mt7921_dev *dev, __le32 *txwi, val = FIELD_PREP(MT_TXD1_HDR_FORMAT, MT_HDR_FORMAT_802_3) | FIELD_PREP(MT_TXD1_TID, tid); - if (be16_to_cpu(skb->protocol) >= ETH_P_802_3_MIN) + ethertype = get_unaligned_be16(&skb->data[12]); + if (ethertype >= ETH_P_802_3_MIN) val |= MT_TXD1_ETH_802_3; txwi[1] |= cpu_to_le32(val); -- 2.39.5