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mt76: backport fix encap offload ethernet type check

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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.

Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>
Signed-off-by: Petr Štetiar <ynezz@true.cz> [commit description]
This commit is contained in:
Thibaut VARÈNE 2022-04-20 17:57:47 +02:00 committed by Petr Štetiar
parent 8b552b1d28
commit 4cb9d08e71
1 changed files with 63 additions and 0 deletions
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63
package/kernel/mt76/patches/101-fix-encap-offload-ethernet-type-check.patch Normal file
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@ -0,0 +1,63 @@
From: Felix Fietkau <nbd@nbd.name>
To: linux-wireless@vger.kernel.org
Cc: =?utf-8?q?Thibaut_VAR=C3=88NE?= <hacks+kernel@slashdirt.org>
Subject: [PATCH] mt76: fix encap offload ethernet type check
Date: Wed, 20 Apr 2022 14:33:08 +0200
Message-Id: <20220420123308.70104-1-nbd@nbd.name>
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>
---
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 5f4a0e811137..e353e8c44d6c 100644
--- a/mt7915/mac.c
+++ b/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 368e54c53ddd..ac11e8b28f13 100644
--- a/mt7921/mac.c
+++ b/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);