8139cp: ring_info removal for the transmit path

As long as the descriptor fits on a single cacheline, the change
should be almost free.

Now ring_info is not used at all. Remove it.

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

diff --git a/drivers/net/8139cp.c b/drivers/net/8139cp.c
index bbdaa18879abf83aa6c068191747d2804a64761d..c3b8400bdc3f99b1b62702ba4cd4d20a65cd421a 100644 (file)
--- a/drivers/net/8139cp.c
+++ b/drivers/net/8139cp.c
@@ -314,11 +314,6 @@ struct cp_desc {
        u64             addr;
 };
 
-struct ring_info {
-       struct sk_buff          *skb;
-       u32                     len;
-};
-
 struct cp_dma_stats {
        u64                     tx_ok;
        u64                     rx_ok;
@@ -360,7 +355,7 @@ struct cp_private {
        unsigned                tx_head         ____cacheline_aligned;
        unsigned                tx_tail;
        struct cp_desc          *tx_ring;
-       struct ring_info        tx_skb[CP_TX_RING_SIZE];
+       struct sk_buff          *tx_skb[CP_TX_RING_SIZE];
 
        unsigned                rx_buf_sz;
        unsigned                wol_enabled : 1; /* Is Wake-on-LAN enabled? */
@@ -721,11 +716,12 @@ static void cp_tx (struct cp_private *cp)
                if (status & DescOwn)
                        break;
 
-               skb = cp->tx_skb[tx_tail].skb;
+               skb = cp->tx_skb[tx_tail];
                BUG_ON(!skb);
 
                pci_unmap_single(cp->pdev, le64_to_cpu(txd->addr),
-                                cp->tx_skb[tx_tail].len, PCI_DMA_TODEVICE);
+                                le32_to_cpu(txd->opts1) & 0xffff,
+                                PCI_DMA_TODEVICE);
 
                if (status & LastFrag) {
                        if (status & (TxError | TxFIFOUnder)) {
@@ -752,7 +748,7 @@ static void cp_tx (struct cp_private *cp)
                        dev_kfree_skb_irq(skb);
                }
 
-               cp->tx_skb[tx_tail].skb = NULL;
+               cp->tx_skb[tx_tail] = NULL;
 
                tx_tail = NEXT_TX(tx_tail);
        }
@@ -822,8 +818,7 @@ static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
                txd->opts1 = cpu_to_le32(flags);
                wmb();
 
-               cp->tx_skb[entry].skb = skb;
-               cp->tx_skb[entry].len = len;
+               cp->tx_skb[entry] = skb;
                entry = NEXT_TX(entry);
        } else {
                struct cp_desc *txd;
@@ -839,8 +834,7 @@ static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
                first_len = skb_headlen(skb);
                first_mapping = pci_map_single(cp->pdev, skb->data,
                                               first_len, PCI_DMA_TODEVICE);
-               cp->tx_skb[entry].skb = skb;
-               cp->tx_skb[entry].len = first_len;
+               cp->tx_skb[entry] = skb;
                entry = NEXT_TX(entry);
 
                for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) {
@@ -881,8 +875,7 @@ static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
                        txd->opts1 = cpu_to_le32(ctrl);
                        wmb();
 
-                       cp->tx_skb[entry].skb = skb;
-                       cp->tx_skb[entry].len = len;
+                       cp->tx_skb[entry] = skb;
                        entry = NEXT_TX(entry);
                }
 
@@ -1159,12 +1152,13 @@ static void cp_clean_rings (struct cp_private *cp)
        }
 
        for (i = 0; i < CP_TX_RING_SIZE; i++) {
-               if (cp->tx_skb[i].skb) {
-                       struct sk_buff *skb = cp->tx_skb[i].skb;
+               if (cp->tx_skb[i]) {
+                       struct sk_buff *skb = cp->tx_skb[i];
 
                        desc = cp->tx_ring + i;
                        pci_unmap_single(cp->pdev, le64_to_cpu(desc->addr),
-                                        cp->tx_skb[i].len, PCI_DMA_TODEVICE);
+                                        le32_to_cpu(desc->opts1) & 0xffff,
+                                        PCI_DMA_TODEVICE);
                        if (le32_to_cpu(desc->opts1) & LastFrag)
                                dev_kfree_skb(skb);
                        cp->net_stats.tx_dropped++;
@@ -1175,7 +1169,7 @@ static void cp_clean_rings (struct cp_private *cp)
        memset(cp->tx_ring, 0, sizeof(struct cp_desc) * CP_TX_RING_SIZE);
 
        memset(cp->rx_skb, 0, sizeof(struct sk_buff *) * CP_RX_RING_SIZE);
-       memset(&cp->tx_skb, 0, sizeof(struct ring_info) * CP_TX_RING_SIZE);
+       memset(cp->tx_skb, 0, sizeof(struct sk_buff *) * CP_TX_RING_SIZE);
 }
 
 static void cp_free_rings (struct cp_private *cp)