netdev - [PATCH] net: ethernet: octeon_mgmt: Account for second possible VLAN header

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Message-ID: <20191106153125.118789-1-alexander.sverdlin@nokia.com>
Date:   Wed, 6 Nov 2019 15:32:01 +0000
From:   "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@...ia.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@...ia.com>,
        "David S . Miller " <davem@...emloft.net>
Subject: [PATCH] net: ethernet: octeon_mgmt: Account for second possible VLAN
 header

From: Alexander Sverdlin <alexander.sverdlin@...ia.com>

Octeon's input ring-buffer entry has 14 bits-wide size field, so to account
for second possible VLAN header max_mtu must be further reduced.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>
---
 drivers/net/ethernet/cavium/octeon/octeon_mgmt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c b/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
index 0e5de88..cdd7e5d 100644
--- a/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
+++ b/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
@@ -1499,7 +1499,7 @@ static int octeon_mgmt_probe(struct platform_device *pdev)
 	netdev->ethtool_ops = &octeon_mgmt_ethtool_ops;
 
 	netdev->min_mtu = 64 - OCTEON_MGMT_RX_HEADROOM;
-	netdev->max_mtu = 16383 - OCTEON_MGMT_RX_HEADROOM;
+	netdev->max_mtu = 16383 - OCTEON_MGMT_RX_HEADROOM - VLAN_HLEN;
 
 	mac = of_get_mac_address(pdev->dev.of_node);
 
-- 
2.4.6