skge: add GRO support

- napi_gro_flush() is exported from net/core/dev.c, to avoid
  an irq_save/irq_restore in the packet receive path.
- use napi_gro_receive() instead of netif_receive_skb()
- use napi_gro_flush() before calling __napi_complete()
- turn on NETIF_F_GRO by default
- Tested on a Marvell 88E8001 Gigabit NIC

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 6 insertions, 3 deletions

diff --git a/drivers/net/skge.c b/drivers/net/skge.c
index 40e5c46e7571..a8a63581d63d 100644
--- a/drivers/net/skge.c
+++ b/drivers/net/skge.c
@@ -3178,8 +3178,7 @@ static int skge_poll(struct napi_struct *napi, int to_do)
 
                 skb = skge_rx_get(dev, e, control, rd->status, rd->csum2);
                 if (likely(skb)) {
-                        netif_receive_skb(skb);
-
+                        napi_gro_receive(napi, skb);
                         ++work_done;
                 }
         }
@@ -3192,6 +3191,7 @@ static int skge_poll(struct napi_struct *napi, int to_do)
         if (work_done < to_do) {
                 unsigned long flags;
 
+                napi_gro_flush(napi);
                 spin_lock_irqsave(&hw->hw_lock, flags);
                 __napi_complete(napi);
                 hw->intr_mask |= napimask[skge->port];
@@ -3849,6 +3849,7 @@ static struct net_device *skge_devinit(struct skge_hw *hw, int port,
                 dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
                 skge->rx_csum = 1;
         }
+        dev->features |= NETIF_F_GRO;
 
         /* read the mac address */
         memcpy_fromio(dev->dev_addr, hw->regs + B2_MAC_1 + port*8, ETH_ALEN);
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c82220a9f3d5..af05186d5b36 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1702,6 +1702,7 @@ extern gro_result_t	dev_gro_receive(struct napi_struct *napi,
 extern gro_result_t     napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
 extern gro_result_t     napi_gro_receive(struct napi_struct *napi,
                                          struct sk_buff *skb);
+extern void             napi_gro_flush(struct napi_struct *napi);
 extern void             napi_reuse_skb(struct napi_struct *napi,
                                        struct sk_buff *skb);
 extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
diff --git a/net/core/dev.c b/net/core/dev.c
index 63bd20a75929..d8c43e73f0b7 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3063,7 +3063,7 @@ out:
         return netif_receive_skb(skb);
 }
 
-static void napi_gro_flush(struct napi_struct *napi)
+inline void napi_gro_flush(struct napi_struct *napi)
 {
         struct sk_buff *skb, *next;
 
@@ -3076,6 +3076,7 @@ static void napi_gro_flush(struct napi_struct *napi)
         napi->gro_count = 0;
         napi->gro_list = NULL;
 }
+EXPORT_SYMBOL(napi_gro_flush);
 
 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
 {