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    Subject[PATCH 5.18 161/879] mt76: fix encap offload ethernet type check
    Date
    From: Felix Fietkau <nbd@nbd.name>

    [ Upstream commit bc98e7fdd80d215b4b55eea001023231eb8ce12e ]

    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 <hacks+kernel@slashdirt.org>
    Signed-off-by: Felix Fietkau <nbd@nbd.name>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    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 a8df65cc115f..eaa31f5e0b00 100644
    --- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
    +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
    @@ -1017,6 +1017,7 @@ 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;

    @@ -1030,7 +1031,8 @@ 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 f34070ca7bbe..c5350e7a11e6 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);
    --
    2.35.1


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