[PATCH net-next] sunvnet: restrict advertized checksum offloads to just IP

As much as we'd like to play well with others, we really aren't
handling the checksums on non-IP protocol packets very well.  This
is easily seen when trying to do TCP over ipv6 - the checksums are
garbage.

Here we restrict the checksum feature flag to just IP traffic so
that we aren't given work we can't yet do.

Orabug: 26175391, 26259755

Signed-off-by: Shannon Nelson <redacted>
---
 drivers/net/ethernet/sun/ldmvsw.c  |    2 +-
 drivers/net/ethernet/sun/sunvnet.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sun/ldmvsw.c b/drivers/net/ethernet/sun/ldmvsw.c
index 5b56c24..8603e39 100644
--- a/drivers/net/ethernet/sun/ldmvsw.c
+++ b/drivers/net/ethernet/sun/ldmvsw.c

@@ -248,7 +248,7 @@ static void vsw_poll_controller(struct net_device *dev)
 	dev->ethtool_ops = &vsw_ethtool_ops;
 	dev->watchdog_timeo = VSW_TX_TIMEOUT;
 
-	dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG;
+	dev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG;
 	dev->features = dev->hw_features;
 
 	/* MTU range: 68 - 65535 */

diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c
index 0b95105..75b167e 100644
--- a/drivers/net/ethernet/sun/sunvnet.c
+++ b/drivers/net/ethernet/sun/sunvnet.c

@@ -312,7 +312,7 @@ static void vnet_poll_controller(struct net_device *dev)
 	dev->watchdog_timeo = VNET_TX_TIMEOUT;
 
 	dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE |
-			   NETIF_F_HW_CSUM | NETIF_F_SG;
+			   NETIF_F_IP_CSUM | NETIF_F_SG;
 	dev->features = dev->hw_features;
 
 	/* MTU range: 68 - 65535 */

-- 
1.7.1

From: Shannon Nelson <redacted>
Date: Wed, 14 Jun 2017 15:43:37 -0700

As much as we'd like to play well with others, we really aren't
handling the checksums on non-IP protocol packets very well.  This
is easily seen when trying to do TCP over ipv6 - the checksums are
garbage.

Here we restrict the checksum feature flag to just IP traffic so
that we aren't given work we can't yet do.

Orabug: 26175391, 26259755

Signed-off-by: Shannon Nelson <redacted>

Applied, but this bug must be fixed properly and ipv6 checksumming
properly supported.

Thanks.

On 6/15/2017 11:23 AM, David Miller wrote:

Applied, but this bug must be fixed properly and ipv6 checksumming
properly supported.

Thanks.

Understood - we just wanted first to stop the bleeding while we think about how to do this right.

Thanks,
sln