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mv643xx_eth: use sw csum for big packets

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Some controllers (KW, Dove) limits the TX IP/layer4 checksum offloading to a max size.

Signed-off-by: Saeed Bishara <saeed@marvell.com>
Acked-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Saeed Bishara 2010-06-27 00:26:43 +00:00 • committed by David S. Miller
commit 9b2c2ff7a1
2 changed files with 12 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

9
drivers/net/mv643xx_eth.c
View file

@ -289,6 +289,7 @@ struct mv643xx_eth_shared_private {
unsigned int t_clk;
int extended_rx_coal_limit;
int tx_bw_control;
int tx_csum_limit;
};
#define TX_BW_CONTROL_ABSENT 0
@ -776,13 +777,16 @@ static int txq_submit_skb(struct tx_queue *txq, struct sk_buff *skb)
l4i_chk = 0;
if (skb->ip_summed == CHECKSUM_PARTIAL) {
int hdr_len;
int tag_bytes;
BUG_ON(skb->protocol != htons(ETH_P_IP) &&
skb->protocol != htons(ETH_P_8021Q));
tag_bytes = (void *)ip_hdr(skb) - (void *)skb->data - ETH_HLEN;
if (unlikely(tag_bytes & ~12)) {
hdr_len = (void *)ip_hdr(skb) - (void *)skb->data;
tag_bytes = hdr_len - ETH_HLEN;
if (skb->len - hdr_len > mp->shared->tx_csum_limit ||
unlikely(tag_bytes & ~12)) {
if (skb_checksum_help(skb) == 0)
goto no_csum;
kfree_skb(skb);
@ -2666,6 +2670,7 @@ static int mv643xx_eth_shared_probe(struct platform_device *pdev)
* Detect hardware parameters.
*/
msp->t_clk = (pd != NULL && pd->t_clk != 0) ? pd->t_clk : 133000000;
msp->tx_csum_limit = pd->tx_csum_limit ? pd->tx_csum_limit : 9 * 1024;
infer_hw_params(msp);
platform_set_drvdata(pdev, msp);

5
include/linux/mv643xx_eth.h
View file

@ -19,6 +19,11 @@ struct mv643xx_eth_shared_platform_data {
struct mbus_dram_target_info *dram;
struct platform_device *shared_smi;
unsigned int t_clk;
/*
* Max packet size for Tx IP/Layer 4 checksum, when set to 0, default
* limit of 9KiB will be used.
*/
int tx_csum_limit;
};
#define MV643XX_ETH_PHY_ADDR_DEFAULT 0