[PATCH v2] net: ethernet: octeon_mgmt: Account for second possible VLAN header

[PATCH v2] net: ethernet: octeon_mgmt: Account for second possible VLAN header

[Sverdlin, Alexander (Nokia - DE/Ulm)]

From: Alexander Sverdlin <alexander.sverdlin@nokia.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.

Fixes: 109cc16526c6d ("ethernet/cavium: use core min/max MTU checking")
Cc: stable@vger.kernel.org
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
---
Changelog:
v2: Added "Fixes:" tag, Cc'ed stable

 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

Re: [PATCH v2] net: ethernet: octeon_mgmt: Account for second possible VLAN header

[David Miller]

From: "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@nokia.com>
Date: Fri, 8 Nov 2019 10:00:44 +0000

> From: Alexander Sverdlin <alexander.sverdlin@nokia.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.
> 
> Fixes: 109cc16526c6d ("ethernet/cavium: use core min/max MTU checking")
> Cc: stable@vger.kernel.org
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
> ---
> Changelog:
> v2: Added "Fixes:" tag, Cc'ed stable

Networking patches do not CC: stable, as per the Netdev FAQ

Re: [PATCH v2] net: ethernet: octeon_mgmt: Account for second possible VLAN header

[David Miller]

From: David Miller <davem@davemloft.net>
Date: Fri, 08 Nov 2019 11:09:21 -0800 (PST)

> From: "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@nokia.com>
> Date: Fri, 8 Nov 2019 10:00:44 +0000
> 
>> From: Alexander Sverdlin <alexander.sverdlin@nokia.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.
>> 
>> Fixes: 109cc16526c6d ("ethernet/cavium: use core min/max MTU checking")
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
>> ---
>> Changelog:
>> v2: Added "Fixes:" tag, Cc'ed stable
> 
> Networking patches do not CC: stable, as per the Netdev FAQ

Applied with stable CC: removed, and queued up for -stable, thanks.