netdev - [PATCH net 2/8] qede: Reload on GRO changes

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Date:	Thu, 26 May 2016 11:01:18 +0300
From:	Yuval Mintz <Yuval.Mintz@...gic.com>
To:	<davem@...emloft.net>, <netdev@...r.kernel.org>
CC:	Yuval Mintz <Yuval.Mintz@...gic.com>
Subject: [PATCH net 2/8] qede: Reload on GRO changes

Since driver is using a FW-based GRO implementation, this has some
effects on its ability to cope with GRO enablement/disablement.
As a result, driver must perform an inner-reload as a result of a state
change in the offload configuration of said feature.

[Failure to do so means network stack would continue to receive
aggregated packets even though user requested the feature to be disabled].

Signed-off-by: Yuval Mintz <Yuval.Mintz@...gic.com>
---
 drivers/net/ethernet/qlogic/qede/qede_main.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c
index 3bb1428..5d00d14 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_main.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
@@ -2091,6 +2091,29 @@ static void qede_vlan_mark_nonconfigured(struct qede_dev *edev)
 	edev->accept_any_vlan = false;
 }
 
+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 (need_reload && netif_running(edev->ndev)) {
+		dev->features = features;
+		qede_reload(edev, NULL, NULL);
+		return 1;
+	}
+
+	return 0;
+}
+
 #ifdef CONFIG_QEDE_VXLAN
 static void qede_add_vxlan_port(struct net_device *dev,
 				sa_family_t sa_family, __be16 port)
@@ -2175,6 +2198,7 @@ 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_set_features = qede_set_features,
 	.ndo_get_stats64 = qede_get_stats64,
 #ifdef CONFIG_QED_SRIOV
 	.ndo_set_vf_link_state = qede_set_vf_link_state,
-- 
1.9.3