r8169: Rx path update

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

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Edward Hsu <edward_hsu@realtek.com.tw>

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index e4827a4..4d0cdba 100644 (file)
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -2483,25 +2483,27 @@ static inline void rtl8169_rx_csum(struct sk_buff *skb, struct RxDesc *desc)
                skb->ip_summed = CHECKSUM_NONE;
 }
 
-static inline int rtl8169_try_rx_copy(struct sk_buff **sk_buff, int pkt_size,
-                                     struct RxDesc *desc, int rx_buf_sz,
-                                     unsigned int align)
+static inline bool rtl8169_try_rx_copy(struct sk_buff **sk_buff, int pkt_size,
+                                      struct pci_dev *pdev, dma_addr_t addr,
+                                      unsigned int align)
 {
-       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 = dev_alloc_skb(pkt_size + align);
-               if (skb) {
-                       skb_reserve(skb, (align - 1) & (unsigned long)skb->data);
-                       skb_copy_from_linear_data(*sk_buff, skb->data, pkt_size);
-                       *sk_buff = skb;
-                       rtl8169_mark_to_asic(desc, rx_buf_sz);
-                       ret = 0;
-               }
-       }
-       return ret;
+       skb = dev_alloc_skb(pkt_size + align);
+       if (!skb)
+               goto out;
+
+       pci_dma_sync_single_for_cpu(pdev, addr, pkt_size, PCI_DMA_FROMDEVICE);
+       skb_reserve(skb, (align - 1) & (unsigned long)skb->data);
+       skb_copy_from_linear_data(*sk_buff, skb->data, pkt_size);
+       *sk_buff = skb;
+       done = true;
+out:
+       return done;
 }
 
 static int
@@ -2547,9 +2549,9 @@ rtl8169_rx_interrupt(struct net_device *dev, struct rtl8169_private *tp,
                        rtl8169_mark_to_asic(desc, tp->rx_buf_sz);
                } else {
                        struct sk_buff *skb = tp->Rx_skbuff[entry];
+                       dma_addr_t addr = le64_to_cpu(desc->addr);
                        int pkt_size = (status & 0x00001FFF) - 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;
 
                        /*
                         * The driver does not support incoming fragmented
@@ -2565,19 +2567,17 @@ rtl8169_rx_interrupt(struct net_device *dev, struct rtl8169_private *tp,
 
                        rtl8169_rx_csum(skb, desc);
 
-                       pci_dma_sync_single_for_cpu(tp->pci_dev,
-                               le64_to_cpu(desc->addr), tp->rx_buf_sz,
-                               PCI_DMA_FROMDEVICE);
-
-                       if (rtl8169_try_rx_copy(&skb, pkt_size, desc,
-                                               tp->rx_buf_sz, tp->align)) {
-                               pci_action = pci_unmap_single;
+                       if (rtl8169_try_rx_copy(&skb, pkt_size, pdev, addr,
+                                               tp->align)) {
+                               pci_dma_sync_single_for_device(pdev, addr,
+                                       pkt_size, PCI_DMA_FROMDEVICE);
+                               rtl8169_mark_to_asic(desc, tp->rx_buf_sz);
+                       } else {
+                               pci_unmap_single(pdev, addr, pkt_size,
+                                                PCI_DMA_FROMDEVICE);
                                tp->Rx_skbuff[entry] = NULL;
                        }
 
-                       pci_action(tp->pci_dev, le64_to_cpu(desc->addr),
-                                  tp->rx_buf_sz, PCI_DMA_FROMDEVICE);
-
                        skb_put(skb, pkt_size);
                        skb->protocol = eth_type_trans(skb, dev);