From: Jason Xing <kernelxing@tencent.com>
Date: Thu, 9 Feb 2023 10:41:28 +0800
Subject: ixgbe: add double of VLAN header when computing the max MTU
Patch-mainline: v6.2
Git-commit: 0967bf837784a11c65d66060623a74e65211af0b
References: jsc#SLE-18384
Include the second VLAN HLEN into account when computing the maximum
MTU size as other drivers do.
Fixes: fabf1bce103a ("ixgbe: Prevent unsupported configurations with XDP")
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Tested-by: Chandan Kumar Rout <chandanx.rout@intel.com> (A Contingent Worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/intel/ixgbe/ixgbe.h | 2 ++
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 3 +--
2 files changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -67,6 +67,8 @@
#define IXGBE_RXBUFFER_4K 4096
#define IXGBE_MAX_RXBUFFER 16384 /* largest size for a single descriptor */
+#define IXGBE_PKT_HDR_PAD (ETH_HLEN + ETH_FCS_LEN + (VLAN_HLEN * 2))
+
/* Attempt to maximize the headroom available for incoming frames. We
* use a 2K buffer for receives and need 1536/1534 to store the data for
* the frame. This leaves us with 512 bytes of room. From that we need
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -6758,8 +6758,7 @@ static int ixgbe_change_mtu(struct net_d
struct ixgbe_adapter *adapter = netdev_priv(netdev);
if (ixgbe_enabled_xdp_adapter(adapter)) {
- int new_frame_size = new_mtu + ETH_HLEN + ETH_FCS_LEN +
- VLAN_HLEN;
+ int new_frame_size = new_mtu + IXGBE_PKT_HDR_PAD;
if (new_frame_size > ixgbe_max_xdp_frame_size(adapter)) {
e_warn(probe, "Requested MTU size is not supported with XDP\n");