Some controllers (KW, Dove) limits the TX IP/layer4 checksum offloading to a max size.
Signed-off-by: Saeed Bishara <saeed@xxxxxxxxxxx>
---
drivers/net/mv643xx_eth.c | 10 ++++++++++
include/linux/mv643xx_eth.h | 4 ++++
2 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index e345ec8..79243dd 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -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
@@ -2468,6 +2469,14 @@ static int mv643xx_eth_change_mtu(struct net_device *dev, int new_mtu)
mv643xx_eth_recalc_skb_size(mp);
tx_set_rate(mp, 1000000000, 16777216);
+ if (mp->shared->tx_csum_limit && dev->mtu > mp->shared->tx_csum_limit) {
+ dev->features &= ~NETIF_F_IP_CSUM;
+ dev->vlan_features &= ~NETIF_F_IP_CSUM;
+ } else {
+ dev->features |= NETIF_F_IP_CSUM;
+ dev->vlan_features |= NETIF_F_IP_CSUM;
+ }
+
if (!netif_running(dev))
return 0;
@@ -2666,6 +2675,7 @@ 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;
infer_hw_params(msp);
platform_set_drvdata(pdev, msp);
diff --git a/include/linux/mv643xx_eth.h b/include/linux/mv643xx_eth.h
index cbbbe9b..7402718 100644
--- a/include/linux/mv643xx_eth.h
+++ b/include/linux/mv643xx_eth.h
@@ -19,6 +19,10 @@ 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 (0 -> no limit)
+ */
+ int tx_csum_limit;
};
#define MV643XX_ETH_PHY_ADDR_DEFAULT 0
--
1.6.0.4
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