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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>
This commit is contained in:
Atsushi Nemoto 2008-12-11 20:58:04 -08:00 committed by David S. Miller
parent 2cb377283f
commit 82a9928db5
1 changed files with 12 additions and 8 deletions
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20
drivers/net/tc35815.c
View File

@ -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))