tc35815: Enable StripCRC feature

The chip can strip CRC automatically on receiving.  Enable it.

Also fix potential RX_BUF_SIZE calculation bug which was obscured by
alignment.  And use proper symbols (NET_IP_ALIGN, ETH_FCS_LEN, etc.)
instead of magic numbers.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 8 deletions

diff --git a/drivers/net/tc35815.c b/drivers/net/tc35815.c
index 44126c463fac..308f365270e9 100644
--- a/drivers/net/tc35815.c
+++ b/drivers/net/tc35815.c
@@ -37,6 +37,7 @@ static const char *version = "tc35815.c:v" DRV_VERSION "\n";
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
 #include <linux/in.h>
+#include <linux/if_vlan.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/spinlock.h>
@@ -341,7 +342,7 @@ struct BDesc {
         Tx_En)  /* maybe  0x7b01 */
 #endif
 #define RX_CTL_CMD      (Rx_EnGood | Rx_EnRxPar | Rx_EnLongErr | Rx_EnOver \
-        | Rx_EnCRCErr | Rx_EnAlign | Rx_RxEn)   /* maybe 0x6f01 */
+        | Rx_EnCRCErr | Rx_EnAlign | Rx_StripCRC | Rx_RxEn) /* maybe 0x6f11 */
 #define INT_EN_CMD  (Int_NRAbtEn | \
         Int_DmParErrEn | Int_DParDEn | Int_DParErrEn | \
         Int_SSysErrEn  | Int_RMasAbtEn | Int_RTargAbtEn | \
@@ -373,9 +374,11 @@ struct BDesc {
 #if RX_CTL_CMD & Rx_LongEn
 #define RX_BUF_SIZE     PAGE_SIZE
 #elif RX_CTL_CMD & Rx_StripCRC
-#define RX_BUF_SIZE     ALIGN(ETH_FRAME_LEN + 4 + 2, 32) /* +2: reserve */
+#define RX_BUF_SIZE     \
+        L1_CACHE_ALIGN(ETH_FRAME_LEN + VLAN_HLEN + NET_IP_ALIGN)
 #else
-#define RX_BUF_SIZE     ALIGN(ETH_FRAME_LEN + 2, 32) /* +2: reserve */
+#define RX_BUF_SIZE     \
+        L1_CACHE_ALIGN(ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN + NET_IP_ALIGN)
 #endif
 #endif /* TC35815_USE_PACKEDBUFFER */
 #define RX_FD_RESERVE   (2 / 2) /* max 2 BD per RxFD */
@@ -1666,7 +1669,7 @@ tc35815_rx(struct net_device *dev)
                 struct RxFD *next_rfd;
 #endif
 #if (RX_CTL_CMD & Rx_StripCRC) == 0
-                pkt_len -= 4;
+                pkt_len -= ETH_FCS_LEN;
 #endif
 
                 if (netif_msg_rx_status(lp))
@@ -1685,14 +1688,14 @@ tc35815_rx(struct net_device *dev)
 #endif
 #ifdef TC35815_USE_PACKEDBUFFER
                         BUG_ON(bd_count > 2);
-                        skb = dev_alloc_skb(pkt_len + 2); /* +2: for reserve */
+                        skb = dev_alloc_skb(pkt_len + NET_IP_ALIGN);
                         if (skb == NULL) {
                                 printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
                                        dev->name);
                                 dev->stats.rx_dropped++;
                                 break;
                         }
-                        skb_reserve(skb, 2);   /* 16 bit alignment */
+                        skb_reserve(skb, NET_IP_ALIGN);
 
                         data = skb_put(skb, pkt_len);
 
@@ -1744,8 +1747,9 @@ tc35815_rx(struct net_device *dev)
                         pci_unmap_single(lp->pci_dev,
                                          lp->rx_skbs[cur_bd].skb_dma,
                                          RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
-                        if (!HAVE_DMA_RXALIGN(lp))
-                                memmove(skb->data, skb->data - 2, pkt_len);
+                        if (!HAVE_DMA_RXALIGN(lp) && NET_IP_ALIGN)
+                                memmove(skb->data, skb->data - NET_IP_ALIGN,
+                                        pkt_len);
                         data = skb_put(skb, pkt_len);
 #endif /* TC35815_USE_PACKEDBUFFER */
                         if (netif_msg_pktdata(lp))