[Intel-wired-lan] [PATCH iwl-net v1 2/2] ice: use NETIF_F_HW_CSUM instead of IP/IPV6

[Michal Swiatkowski]

The hardware is capable of calculating checksum for IPV6 packets with
extension header. To not drop such packets switch from IP/IPV6 checksum
to HW_CSUM.

HW_CSUM is also used in previous generation (i40e).

Previously HW_CSUM was used to indicate that hardware supports general
checksum. Drop it assuming that if the hardware supports it, it is used.

Disabling offload for E830 in case of TSO isn't needed anymore as the
check for TSO is done in Tx path just before preparation of the special
GCS descriptor.

The commit from Fixes didn't introduce a bug, it just shown that the
driver is doing sth wrong with the checksum features.

Suggested-by: Jakub Ramaseuski <jramaseu at redhat.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel at intel.com>
Fixes: 04c20a9356f2 ("net: skip offload for NETIF_F_IPV6_CSUM if ipv6 header contains extension")
Signed-off-by: Michal Swiatkowski <michal.swiatkowski at linux.intel.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 21 +--------------------
 1 file changed, 1 insertion(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 15550216fbf0..0f2f949af536 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3500,9 +3500,8 @@ void ice_set_netdev_features(struct net_device *netdev)
 			NETIF_F_RXHASH;
 
 	csumo_features = NETIF_F_RXCSUM	  |
-			 NETIF_F_IP_CSUM  |
 			 NETIF_F_SCTP_CRC |
-			 NETIF_F_IPV6_CSUM;
+			 NETIF_F_HW_CSUM;
 
 	vlano_features = NETIF_F_HW_VLAN_CTAG_FILTER |
 			 NETIF_F_HW_VLAN_CTAG_TX     |
@@ -3564,12 +3563,6 @@ void ice_set_netdev_features(struct net_device *netdev)
 	/* Allow core to manage IRQs affinity */
 	netif_set_affinity_auto(netdev);
 
-	/* Mutual exclusivity for TSO and GCS is enforced by the set features
-	 * ndo callback.
-	 */
-	if (ice_is_feature_supported(pf, ICE_F_GCS))
-		netdev->hw_features |= NETIF_F_HW_CSUM;
-
 	netif_set_tso_max_size(netdev, ICE_MAX_TSO_SIZE);
 }
 
@@ -6489,18 +6482,6 @@ ice_set_features(struct net_device *netdev, netdev_features_t features)
 	if (changed & NETIF_F_LOOPBACK)
 		ret = ice_set_loopback(vsi, !!(features & NETIF_F_LOOPBACK));
 
-	/* Due to E830 hardware limitations, TSO (NETIF_F_ALL_TSO) with GCS
-	 * (NETIF_F_HW_CSUM) is not supported.
-	 */
-	if (ice_is_feature_supported(pf, ICE_F_GCS) &&
-	    ((features & NETIF_F_HW_CSUM) && (features & NETIF_F_ALL_TSO))) {
-		if (netdev->features & NETIF_F_HW_CSUM)
-			dev_err(ice_pf_to_dev(pf), "To enable TSO, you must first disable HW checksum.\n");
-		else
-			dev_err(ice_pf_to_dev(pf), "To enable HW checksum, you must first disable TSO.\n");
-		return -EIO;
-	}
-
 	return ret;
 }
 
-- 
2.49.0