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>

diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 1ace41a13ac360363b2857475920a014daad4e94..e1746eeb34a47145537a60488f4d8dd2f5572871 100644 (file)
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -493,6 +493,36 @@ static void enable_all_napi(struct adapter *adap)
                        napi_enable(&adap->sge.qs[i].napi);
 }
 
+/**
+ *     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
@@ -516,8 +546,7 @@ static int setup_sge_qsets(struct adapter *adap)
                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,
@@ -1632,13 +1661,10 @@ static int set_rx_csum(struct net_device *dev, u32 data)
 
        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;
 }
@@ -1793,6 +1819,25 @@ static void get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
        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,
@@ -1822,6 +1867,8 @@ static const struct ethtool_ops cxgb_ethtool_ops = {
        .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)
@@ -1938,11 +1985,9 @@ static int cxgb_extension_ioctl(struct net_device *dev, void __user *useraddr)
                                }
                        }
                }
-               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:{