sis190: Rx path update

- remove the function pointer to help gcc optimizing the
  inline pci_dma functions
- pci_dma_sync_single_for_cpu is not needed for a single
  large packet
- convert rtl8169_try_rx_copy to bool

b449655ff52ff8a29c66c5fc3fc03617e61182ee did the same
for the r8169 driver.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>

diff --git a/drivers/net/sis190.c b/drivers/net/sis190.c
index 97aa18d..0b22e75 100644 (file)
--- a/drivers/net/sis190.c
+++ b/drivers/net/sis190.c
@@ -518,25 +518,28 @@ static u32 sis190_rx_fill(struct sis190_private *tp, struct net_device *dev,
        return cur - start;
 }
 
-static int sis190_try_rx_copy(struct sis190_private *tp,
-                             struct sk_buff **sk_buff, int pkt_size,
-                             struct RxDesc *desc)
+static bool sis190_try_rx_copy(struct sis190_private *tp,
+                              struct sk_buff **sk_buff, int pkt_size,
+                              dma_addr_t addr)
 {
-       int ret = -1;
+       struct sk_buff *skb;
+       bool done = false;
 
-       if (pkt_size < rx_copybreak) {
-               struct sk_buff *skb;
+       if (pkt_size >= rx_copybreak)
+               goto out;
 
-               skb = netdev_alloc_skb(tp->dev, pkt_size + 2);
-               if (skb) {
-                       skb_reserve(skb, 2);
-                       skb_copy_to_linear_data(skb, sk_buff[0]->data, pkt_size);
-                       *sk_buff = skb;
-                       sis190_give_to_asic(desc, tp->rx_buf_sz);
-                       ret = 0;
-               }
-       }
-       return ret;
+       skb = netdev_alloc_skb(tp->dev, pkt_size + 2);
+       if (!skb)
+               goto out;
+
+       pci_dma_sync_single_for_device(tp->pci_dev, addr, pkt_size,
+                                      PCI_DMA_FROMDEVICE);
+       skb_reserve(skb, 2);
+       skb_copy_to_linear_data(skb, sk_buff[0]->data, pkt_size);
+       *sk_buff = skb;
+       done = true;
+out:
+       return done;
 }
 
 static inline int sis190_rx_pkt_err(u32 status, struct net_device_stats *stats)
@@ -586,9 +589,9 @@ static int sis190_rx_interrupt(struct net_device *dev,
                        sis190_give_to_asic(desc, tp->rx_buf_sz);
                else {
                        struct sk_buff *skb = tp->Rx_skbuff[entry];
+                       dma_addr_t addr = le32_to_cpu(desc->addr);
                        int pkt_size = (status & RxSizeMask) - 4;
-                       void (*pci_action)(struct pci_dev *, dma_addr_t,
-                               size_t, int) = pci_dma_sync_single_for_device;
+                       struct pci_dev *pdev = tp->pci_dev;
 
                        if (unlikely(pkt_size > tp->rx_buf_sz)) {
                                net_intr(tp, KERN_INFO
@@ -600,19 +603,18 @@ static int sis190_rx_interrupt(struct net_device *dev,
                                continue;
                        }
 
-                       pci_dma_sync_single_for_cpu(tp->pci_dev,
-                               le32_to_cpu(desc->addr), tp->rx_buf_sz,
-                               PCI_DMA_FROMDEVICE);
 
-                       if (sis190_try_rx_copy(tp, &skb, pkt_size, desc)) {
-                               pci_action = pci_unmap_single;
+                       if (sis190_try_rx_copy(tp, &skb, pkt_size, addr)) {
+                               pci_dma_sync_single_for_device(pdev, addr,
+                                       tp->rx_buf_sz, PCI_DMA_FROMDEVICE);
+                               sis190_give_to_asic(desc, tp->rx_buf_sz);
+                       } else {
+                               pci_unmap_single(pdev, addr, tp->rx_buf_sz,
+                                                PCI_DMA_FROMDEVICE);
                                tp->Rx_skbuff[entry] = NULL;
                                sis190_make_unusable_by_asic(desc);
                        }
 
-                       pci_action(tp->pci_dev, le32_to_cpu(desc->addr),
-                                  tp->rx_buf_sz, PCI_DMA_FROMDEVICE);
-
                        skb_put(skb, pkt_size);
                        skb->protocol = eth_type_trans(skb, dev);