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authorLennert Buytenhek <buytenh@wantstofly.org>2008-07-24 06:22:59 +0200
committerLennert Buytenhek <buytenh@marvell.com>2008-07-24 06:22:59 +0200
commite32b66175072d75bde1ddca4227a6723ca17e0af (patch)
treebdbd3342dd0575976f15114759a95c6ff07e95d2 /drivers/net/mv643xx_eth.c
parent2f7eb47a7b9f703d4f7dfdab358df6ff1f2a2204 (diff)
mv643xx_eth: enable hardware TX checksumming with vlan tags
Although mv643xx_eth has no hardware support for inserting a vlan tag by twiddling some bits in the TX descriptor, it does support hardware TX checksumming on packets where the IP header starts {a limited set of values other than 14} bytes into the packet. This patch sets mv643xx_eth's ->vlan_features to NETIF_F_SG | NETIF_F_IP_CSUM, which prevents the stack from checksumming vlan'ed packets in software, and if vlan tags are present on a transmitted packet, notifies the hardware of this fact by toggling the right bits in the TX descriptor. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Diffstat (limited to 'drivers/net/mv643xx_eth.c')
-rw-r--r--drivers/net/mv643xx_eth.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 01dd3c505d25..88bb1f1e8065 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -235,6 +235,8 @@ struct tx_desc {
#define GEN_IP_V4_CHECKSUM 0x00040000
#define GEN_TCP_UDP_CHECKSUM 0x00020000
#define UDP_FRAME 0x00010000
+#define MAC_HDR_EXTRA_4_BYTES 0x00008000
+#define MAC_HDR_EXTRA_8_BYTES 0x00000200
#define TX_IHL_SHIFT 11
@@ -757,12 +759,36 @@ static void txq_submit_skb(struct tx_queue *txq, struct sk_buff *skb)
desc->buf_ptr = dma_map_single(NULL, skb->data, length, DMA_TO_DEVICE);
if (skb->ip_summed == CHECKSUM_PARTIAL) {
- BUG_ON(skb->protocol != htons(ETH_P_IP));
+ int mac_hdr_len;
+
+ BUG_ON(skb->protocol != htons(ETH_P_IP) &&
+ skb->protocol != htons(ETH_P_8021Q));
cmd_sts |= GEN_TCP_UDP_CHECKSUM |
GEN_IP_V4_CHECKSUM |
ip_hdr(skb)->ihl << TX_IHL_SHIFT;
+ mac_hdr_len = (void *)ip_hdr(skb) - (void *)skb->data;
+ switch (mac_hdr_len - ETH_HLEN) {
+ case 0:
+ break;
+ case 4:
+ cmd_sts |= MAC_HDR_EXTRA_4_BYTES;
+ break;
+ case 8:
+ cmd_sts |= MAC_HDR_EXTRA_8_BYTES;
+ break;
+ case 12:
+ cmd_sts |= MAC_HDR_EXTRA_4_BYTES;
+ cmd_sts |= MAC_HDR_EXTRA_8_BYTES;
+ break;
+ default:
+ if (net_ratelimit())
+ dev_printk(KERN_ERR, &txq_to_mp(txq)->dev->dev,
+ "mac header length is %d?!\n", mac_hdr_len);
+ break;
+ }
+
switch (ip_hdr(skb)->protocol) {
case IPPROTO_UDP:
cmd_sts |= UDP_FRAME;
@@ -2565,6 +2591,7 @@ static int mv643xx_eth_probe(struct platform_device *pdev)
* have to map the buffers to ISA memory which is only 16 MB
*/
dev->features = NETIF_F_SG | NETIF_F_IP_CSUM;
+ dev->vlan_features = NETIF_F_SG | NETIF_F_IP_CSUM;
#endif
SET_NETDEV_DEV(dev, &pdev->dev);