From: Divy Le Ray <divy@chelsio.com>
Date: Wed, 29 Oct 2008 05:40:32 +0000 (-0700)
Subject: cxgb3 - enable lro control through ethtool
Acked-by: Karsten Keil <kkeil@novell.com>
Reference: bnc#446739


cxgb3 - enable lro control through ethtool

Implement ethtool's get_flags and set_flags methods.
It enables ethtool to control the LRO settings.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
---

Index: linux-2.6.27/drivers/net/cxgb3/cxgb3_main.c
===================================================================
--- linux-2.6.27.orig/drivers/net/cxgb3/cxgb3_main.c
+++ linux-2.6.27/drivers/net/cxgb3/cxgb3_main.c
@@ -470,6 +470,36 @@ static void enable_all_napi(struct adapt
 }
 
 /**
+ *	set_qset_lro - Turn a queue set's LRO capability on and off
+ *	@dev: the device the qset is attached to
+ *	@qset_idx: the queue set index
+ *	@val: the LRO switch
+ *
+ *	Sets LRO on or off for a particular queue set.
+ *	the device's features flag is updated to reflect the LRO
+ *	capability when all queues belonging to the device are
+ *	in the same state.
+ */
+static void set_qset_lro(struct net_device *dev, int qset_idx, int val)
+{
+	struct port_info *pi = netdev_priv(dev);
+	struct adapter *adapter = pi->adapter;
+	int i, lro_on = 1;
+
+	adapter->params.sge.qset[qset_idx].lro = !!val;
+	adapter->sge.qs[qset_idx].lro_enabled = !!val;
+
+	/* let ethtool report LRO on only if all queues are LRO enabled */
+	for (i = pi->first_qset; i < pi->first_qset + pi->nqsets; ++i)
+		lro_on &= adapter->params.sge.qset[i].lro;
+
+	if (lro_on)
+		dev->features |= NETIF_F_LRO;
+	else
+		dev->features &= ~NETIF_F_LRO;
+}
+
+/**
  *	setup_sge_qsets - configure SGE Tx/Rx/response queues
  *	@adap: the adapter
  *
@@ -492,8 +522,7 @@ static int setup_sge_qsets(struct adapte
 		pi->qs = &adap->sge.qs[pi->first_qset];
 		for (j = pi->first_qset; j < pi->first_qset + pi->nqsets;
 		     ++j, ++qset_idx) {
-			if (!pi->rx_csum_offload)
-				adap->params.sge.qset[qset_idx].lro = 0;
+			set_qset_lro(dev, qset_idx, pi->rx_csum_offload);
 			err = t3_sge_alloc_qset(adap, qset_idx, 1,
 				(adap->flags & USING_MSIX) ? qset_idx + 1 :
 							     irq_idx,
@@ -1637,13 +1666,10 @@ static int set_rx_csum(struct net_device
 
 	p->rx_csum_offload = data;
 	if (!data) {
-		struct adapter *adap = p->adapter;
 		int i;
 
-		for (i = p->first_qset; i < p->first_qset + p->nqsets; i++) {
-			adap->params.sge.qset[i].lro = 0;
-			adap->sge.qs[i].lro_enabled = 0;
-		}
+		for (i = p->first_qset; i < p->first_qset + p->nqsets; i++)
+			set_qset_lro(dev, i, 0);
 	}
 	return 0;
 }
@@ -1798,6 +1824,25 @@ static void get_wol(struct net_device *d
 	memset(&wol->sopass, 0, sizeof(wol->sopass));
 }
 
+static int cxgb3_set_flags(struct net_device *dev, u32 data)
+{
+	struct port_info *pi = netdev_priv(dev);
+	int i;
+
+	if (data & ETH_FLAG_LRO) {
+		if (!pi->rx_csum_offload)
+			return -EINVAL;
+
+		for (i = pi->first_qset; i < pi->first_qset + pi->nqsets; i++)
+			set_qset_lro(dev, i, 1);
+
+	} else
+		for (i = pi->first_qset; i < pi->first_qset + pi->nqsets; i++)
+			set_qset_lro(dev, i, 0);
+
+	return 0;
+}
+
 static const struct ethtool_ops cxgb_ethtool_ops = {
 	.get_settings = get_settings,
 	.set_settings = set_settings,
@@ -1827,6 +1872,8 @@ static const struct ethtool_ops cxgb_eth
 	.get_regs = get_regs,
 	.get_wol = get_wol,
 	.set_tso = ethtool_op_set_tso,
+	.get_flags = ethtool_op_get_flags,
+	.set_flags = cxgb3_set_flags,
 };
 
 static int in_range(int val, int lo, int hi)
@@ -1943,11 +1990,9 @@ static int cxgb_extension_ioctl(struct n
 				}
 			}
 		}
-		if (t.lro >= 0) {
-			struct sge_qset *qs = &adapter->sge.qs[t.qset_idx];
-			q->lro = t.lro;
-			qs->lro_enabled = t.lro;
-		}
+		if (t.lro >= 0)
+			set_qset_lro(dev, t.qset_idx, t.lro);
+
 		break;
 	}
 	case CHELSIO_GET_QSET_PARAMS:{