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[NET]: IPV6 checksum offloading in network devices

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The existing model for checksum offload does not correctly handle
devices that can offload IPV4 and IPV6 only. The NETIF_F_HW_CSUM flag
implies device can do any arbitrary protocol.

This patch:
 * adds NETIF_F_IPV6_CSUM for those devices
 * fixes bnx2 and tg3 devices that need it
 * add NETIF_F_IPV6_CSUM to ipv6 output (incl GSO)
 * fixes assumptions about NETIF_F_ALL_CSUM in nat
 * adjusts bridge union of checksumming computation

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger
2007-06-27 00:47:37 -07:00
committed by David S. Miller
parent d3d6dd3ada
commit d212f87b06
9 changed files with 49 additions and 17 deletions
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10
net/bridge/br_if.c
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@@ -368,10 +368,18 @@ void br_features_recompute(struct net_bridge *br)
list_for_each_entry(p, &br->port_list, list) {
unsigned long feature = p->dev->features;
/* if device needs checksumming, downgrade to hw checksumming */
if (checksum & NETIF_F_NO_CSUM && !(feature & NETIF_F_NO_CSUM))
checksum ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
/* if device can't do all checksum, downgrade to ipv4/ipv6 */
if (checksum & NETIF_F_HW_CSUM && !(feature & NETIF_F_HW_CSUM))
checksum ^= NETIF_F_HW_CSUM | NETIF_F_IP_CSUM;
checksum ^= NETIF_F_HW_CSUM
| NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
if (checksum & NETIF_F_IPV6_CSUM && !(feature & NETIF_F_IPV6_CSUM))
checksum &= ~NETIF_F_IPV6_CSUM;
if (!(feature & NETIF_F_IP_CSUM))
checksum = 0;