[Intel-wired-lan] [next PATCH S90 4/8] i40evf: Fix turning TSO, GSO and GRO on after

[Jablonski, Pawel]

ACK,

Thanks!

-----Original Message-----
From: Michael, Alice 
Sent: Friday, April 20, 2018 10:42 AM
To: Michael, Alice <alice.michael at intel.com>; intel-wired-lan at lists.osuosl.org
Cc: Jablonski, Pawel <pawel.jablonski at intel.com>
Subject: [next PATCH S90 4/8] i40evf: Fix turning TSO, GSO and GRO on after

From: Paweł Jabłoński <pawel.jablonski at intel.com>

This patch fixes the problem where each MTU change turns TSO, GSO and GRO on from off state.

Now when TSO, GSO or GRO is turned off, MTU change does not turn them on.

Signed-off-by: Paweł Jabłoński <pawel.jablonski at intel.com>
---
 drivers/net/ethernet/intel/i40evf/i40evf_main.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index 28a8cc4..3f04a182 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -3357,6 +3357,24 @@ int i40evf_process_config(struct i40evf_adapter *adapter)
 	if (vfres->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_VLAN)
 		netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
 
+	/* Do not turn on offloads when they are requested to be turned off.
+	 * TSO needs minimum 576 bytes to work correctly.
+	 */
+	if (netdev->wanted_features) {
+		if (!(netdev->wanted_features & NETIF_F_TSO) ||
+		    netdev->mtu < 576)
+			netdev->features &= ~NETIF_F_TSO;
+		if (!(netdev->wanted_features & NETIF_F_TSO6) ||
+		    netdev->mtu < 576)
+			netdev->features &= ~NETIF_F_TSO6;
+		if (!(netdev->wanted_features & NETIF_F_TSO_ECN))
+			netdev->features &= ~NETIF_F_TSO_ECN;
+		if (!(netdev->wanted_features & NETIF_F_GRO))
+			netdev->features &= ~NETIF_F_GRO;
+		if (!(netdev->wanted_features & NETIF_F_GSO))
+			netdev->features &= ~NETIF_F_GSO;
+	}
+
 	adapter->vsi.id = adapter->vsi_res->vsi_id;
 
 	adapter->vsi.back = adapter;
--
2.9.5

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