qede: Use NETIF_F_GRO_HW.

Advertise NETIF_F_GRO_HW and set edev->gro_disable according to the
feature flag.  Add qede_fix_features() to drop NETIF_F_GRO_HW if
XDP is running or MTU does not support GRO_HW or GRO is not set.
qede_change_mtu() also checks and disables GRO_HW if MTU is not
supported.

Cc: Ariel Elior <Ariel.Elior@cavium.com>
Cc: everest-linux-l2@cavium.com
Acked-by: Manish Chopra <manish.chopra@cavium.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Acked-by: Manish Chopra <manish.chopra@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qede/qede.h

@@ -494,6 +494,8 @@ int qede_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid);
 void qede_vlan_mark_nonconfigured(struct qede_dev *edev);
 int qede_configure_vlan_filters(struct qede_dev *edev);
 
+netdev_features_t qede_fix_features(struct net_device *dev,
+				    netdev_features_t features);
 int qede_set_features(struct net_device *dev, netdev_features_t features);
 void qede_set_rx_mode(struct net_device *ndev);
 void qede_config_rx_mode(struct net_device *ndev);

drivers/net/ethernet/qlogic/qede/qede_ethtool.c

@@ -940,6 +940,9 @@ int qede_change_mtu(struct net_device *ndev, int new_mtu)
 	DP_VERBOSE(edev, (NETIF_MSG_IFUP | NETIF_MSG_IFDOWN),
 		   "Configuring MTU size of %d\n", new_mtu);
 
+	if (new_mtu > PAGE_SIZE)
+		ndev->features &= ~NETIF_F_GRO_HW;
+
 	/* Set the mtu field and re-start the interface if needed */
 	args.u.mtu = new_mtu;
 	args.func = &qede_update_mtu;

drivers/net/ethernet/qlogic/qede/qede_filter.c

@@ -895,19 +895,26 @@ static void qede_set_features_reload(struct qede_dev *edev,
 	edev->ndev->features = args->u.features;
 }
 
+netdev_features_t qede_fix_features(struct net_device *dev,
+				    netdev_features_t features)
+{
+	struct qede_dev *edev = netdev_priv(dev);
+
+	if (edev->xdp_prog || edev->ndev->mtu > PAGE_SIZE ||
+	    !(features & NETIF_F_GRO))
+		features &= ~NETIF_F_GRO_HW;
+
+	return features;
+}
+
 int qede_set_features(struct net_device *dev, netdev_features_t features)
 {
 	struct qede_dev *edev = netdev_priv(dev);
 	netdev_features_t changes = features ^ dev->features;
 	bool need_reload = false;
 
-	/* No action needed if hardware GRO is disabled during driver load */
-	if (changes & NETIF_F_GRO) {
-		if (dev->features & NETIF_F_GRO)
-			need_reload = !edev->gro_disable;
-		else
-			need_reload = edev->gro_disable;
-	}
+	if (changes & NETIF_F_GRO_HW)
+		need_reload = true;
 
 	if (need_reload) {
 		struct qede_reload_args args;

drivers/net/ethernet/qlogic/qede/qede_main.c

@@ -545,6 +545,7 @@ static const struct net_device_ops qede_netdev_ops = {
 #endif
 	.ndo_vlan_rx_add_vid = qede_vlan_rx_add_vid,
 	.ndo_vlan_rx_kill_vid = qede_vlan_rx_kill_vid,
+	.ndo_fix_features = qede_fix_features,
 	.ndo_set_features = qede_set_features,
 	.ndo_get_stats64 = qede_get_stats64,
 #ifdef CONFIG_QED_SRIOV
@@ -572,6 +573,7 @@ static const struct net_device_ops qede_netdev_vf_ops = {
 	.ndo_change_mtu = qede_change_mtu,
 	.ndo_vlan_rx_add_vid = qede_vlan_rx_add_vid,
 	.ndo_vlan_rx_kill_vid = qede_vlan_rx_kill_vid,
+	.ndo_fix_features = qede_fix_features,
 	.ndo_set_features = qede_set_features,
 	.ndo_get_stats64 = qede_get_stats64,
 	.ndo_udp_tunnel_add = qede_udp_tunnel_add,
@@ -589,6 +591,7 @@ static const struct net_device_ops qede_netdev_vf_xdp_ops = {
 	.ndo_change_mtu = qede_change_mtu,
 	.ndo_vlan_rx_add_vid = qede_vlan_rx_add_vid,
 	.ndo_vlan_rx_kill_vid = qede_vlan_rx_kill_vid,
+	.ndo_fix_features = qede_fix_features,
 	.ndo_set_features = qede_set_features,
 	.ndo_get_stats64 = qede_get_stats64,
 	.ndo_udp_tunnel_add = qede_udp_tunnel_add,
@@ -676,7 +679,7 @@ static void qede_init_ndev(struct qede_dev *edev)
 	ndev->priv_flags |= IFF_UNICAST_FLT;
 
 	/* user-changeble features */
-	hw_features = NETIF_F_GRO | NETIF_F_SG |
+	hw_features = NETIF_F_GRO | NETIF_F_GRO_HW | NETIF_F_SG |
 		      NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 		      NETIF_F_TSO | NETIF_F_TSO6;
 
@@ -1228,18 +1231,9 @@ static int qede_alloc_sge_mem(struct qede_dev *edev, struct qede_rx_queue *rxq)
 	dma_addr_t mapping;
 	int i;
 
-	/* Don't perform FW aggregations in case of XDP */
-	if (edev->xdp_prog)
-		edev->gro_disable = 1;
-
 	if (edev->gro_disable)
 		return 0;
 
-	if (edev->ndev->mtu > PAGE_SIZE) {
-		edev->gro_disable = 1;
-		return 0;
-	}
-
 	for (i = 0; i < ETH_TPA_MAX_AGGS_NUM; i++) {
 		struct qede_agg_info *tpa_info = &rxq->tpa_info[i];
 		struct sw_rx_data *replace_buf = &tpa_info->buffer;
@@ -1269,6 +1263,7 @@ static int qede_alloc_sge_mem(struct qede_dev *edev, struct qede_rx_queue *rxq)
 err:
 	qede_free_sge_mem(edev, rxq);
 	edev->gro_disable = 1;
+	edev->ndev->features &= ~NETIF_F_GRO_HW;
 	return -ENOMEM;
 }
 
@@ -1511,7 +1506,7 @@ static void qede_init_fp(struct qede_dev *edev)
 			 edev->ndev->name, queue_id);
 	}
 
-	edev->gro_disable = !(edev->ndev->features & NETIF_F_GRO);
+	edev->gro_disable = !(edev->ndev->features & NETIF_F_GRO_HW);
 }
 
 static int qede_set_real_num_queues(struct qede_dev *edev)