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sky2: force receive checksum when using RSS on some hardware (v2)

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Found when reviewing the vendor driver. Apparently some chip versions
require receive checksumming to be enabled in order for RSS to work.

Also, if fix_features has to change some settings; put in message
in log in similar manner to netdev_fix_features.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2011-07-07 13:40:00 +00:00 committed by David S. Miller
parent 3f9aed7c7d
commit aa5ca96c8f
2 changed files with 18 additions and 3 deletions
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20
drivers/net/sky2.c
View File

@ -2996,7 +2996,8 @@ static int __devinit sky2_init(struct sky2_hw *hw)
hw->flags = SKY2_HW_GIGABIT
| SKY2_HW_NEWER_PHY
| SKY2_HW_NEW_LE
| SKY2_HW_ADV_POWER_CTL;
| SKY2_HW_ADV_POWER_CTL
| SKY2_HW_RSS_CHKSUM;
/* New transmit checksum */
if (hw->chip_rev != CHIP_REV_YU_EX_B0)
@ -3024,7 +3025,7 @@ static int __devinit sky2_init(struct sky2_hw *hw)
/* The workaround for status conflicts VLAN tag detection. */
if (hw->chip_rev == CHIP_REV_YU_FE2_A0)
hw->flags |= SKY2_HW_VLAN_BROKEN;
hw->flags |= SKY2_HW_VLAN_BROKEN | SKY2_HW_RSS_CHKSUM;
break;
case CHIP_ID_YUKON_SUPR:
@ -3033,6 +3034,9 @@ static int __devinit sky2_init(struct sky2_hw *hw)
| SKY2_HW_NEW_LE
| SKY2_HW_AUTO_TX_SUM
| SKY2_HW_ADV_POWER_CTL;
if (hw->chip_rev == CHIP_REV_YU_SU_A0)
hw->flags |= SKY2_HW_RSS_CHKSUM;
break;
case CHIP_ID_YUKON_UL_2:
@ -4176,8 +4180,18 @@ static u32 sky2_fix_features(struct net_device *dev, u32 features)
/* In order to do Jumbo packets on these chips, need to turn off the
* transmit store/forward. Therefore checksum offload won't work.
*/
if (dev->mtu > ETH_DATA_LEN && hw->chip_id == CHIP_ID_YUKON_EC_U)
if (dev->mtu > ETH_DATA_LEN && hw->chip_id == CHIP_ID_YUKON_EC_U) {
netdev_info(dev, "checksum offload not possible with jumbo frames\n");
features &= ~(NETIF_F_TSO|NETIF_F_SG|NETIF_F_ALL_CSUM);
}
/* Some hardware requires receive checksum for RSS to work. */
if ( (features & NETIF_F_RXHASH) &&
!(features & NETIF_F_RXCSUM) &&
(sky2->hw->flags & SKY2_HW_RSS_CHKSUM)) {
netdev_info(dev, "receive hashing forces receive checksum\n");
features |= NETIF_F_RXCSUM;
}
return features;
}

1
drivers/net/sky2.h
View File

@ -2281,6 +2281,7 @@ struct sky2_hw {
#define SKY2_HW_ADV_POWER_CTL 0x00000080 /* additional PHY power regs */
#define SKY2_HW_RSS_BROKEN 0x00000100
#define SKY2_HW_VLAN_BROKEN 0x00000200
#define SKY2_HW_RSS_CHKSUM 0x00000400 /* RSS requires chksum */
u8 chip_id;
u8 chip_rev;