From: David Thompson <davthompson@nvidia.com>
To: <bryan.whitehead@microchip.com>, <UNGLinuxDriver@microchip.com>,
<andrew+netdev@lunn.ch>, <davem@davemloft.net>,
<edumazet@google.com>, <kuba@kernel.org>, <pabeni@redhat.com>
Cc: <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
David Thompson <davthompson@nvidia.com>
Subject: [PATCH net] net: lan743x: permit VLAN-tagged packets up to configured MTU
Date: Fri, 15 May 2026 19:23:57 +0000 [thread overview]
Message-ID: <20260515192357.3631802-1-davthompson@nvidia.com> (raw)
VLAN-tagged interfaces on lan743x devices were previously unreachable via
SSH and failed to respond to large ping packets (e.g. "ping -s 1469" given
MTU=1500). In these scenarios, "ethtool -S" reports non-zero "RX Oversize
Frame Errors". According to Microchip AN2948, the MAC_RX FSE (VLAN field
size enforcement) bit determines whether frames with VLAN tags exceeding
the base MTU plus tag length are discarded.
The driver must set the MAC_RX.FSE bit before setting MAC_RX.RXEN to allow
VLAN-tagged frames up to the interface MTU, preventing them from being
treated as oversized. As a result, both the base and VLAN-tagged interfaces
can use the same MTU without receive errors.
Fixes: 23f0703c125b ("lan743x: Add main source files for new lan743x driver")
Signed-off-by: David Thompson <davthompson@nvidia.com>
---
drivers/net/ethernet/microchip/lan743x_main.c | 2 ++
drivers/net/ethernet/microchip/lan743x_main.h | 1 +
2 files changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c
index f3332417162e..6c840f8dd9c3 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.c
+++ b/drivers/net/ethernet/microchip/lan743x_main.c
@@ -1266,6 +1266,8 @@ static int lan743x_mac_open(struct lan743x_adapter *adapter)
u32 temp;
temp = lan743x_csr_read(adapter, MAC_RX);
+ temp |= MAC_RX_FSE_;
+ lan743x_csr_write(adapter, MAC_RX, temp);
lan743x_csr_write(adapter, MAC_RX, temp | MAC_RX_RXEN_);
temp = lan743x_csr_read(adapter, MAC_TX);
lan743x_csr_write(adapter, MAC_TX, temp | MAC_TX_TXEN_);
diff --git a/drivers/net/ethernet/microchip/lan743x_main.h b/drivers/net/ethernet/microchip/lan743x_main.h
index 160d94a7cee6..1573c8f9c993 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.h
+++ b/drivers/net/ethernet/microchip/lan743x_main.h
@@ -182,6 +182,7 @@
#define MAC_RX (0x104)
#define MAC_RX_MAX_SIZE_SHIFT_ (16)
#define MAC_RX_MAX_SIZE_MASK_ (0x3FFF0000)
+#define MAC_RX_FSE_ BIT(2)
#define MAC_RX_RXD_ BIT(1)
#define MAC_RX_RXEN_ BIT(0)
--
2.43.0
reply other threads:[~2026-05-15 19:24 UTC|newest]
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