diff options
| author | Lennert Buytenhek <buytenh@wantstofly.org> | 2008-07-24 06:22:59 +0200 |
|---|---|---|
| committer | Lennert Buytenhek <buytenh@marvell.com> | 2008-07-24 06:22:59 +0200 |
| commit | e32b66175072d75bde1ddca4227a6723ca17e0af (patch) | |
| tree | bdbd3342dd0575976f15114759a95c6ff07e95d2 /drivers | |
| parent | 2f7eb47a7b9f703d4f7dfdab358df6ff1f2a2204 (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')
| -rw-r--r-- | drivers/net/mv643xx_eth.c | 29 |
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); |