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>

1 files changed, 28 insertions, 26 deletions

diff --git a/drivers/net/sis190.c b/drivers/net/sis190.c
index 97aa18dd9a4b..0b22e75633a2 100644
--- 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);