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Date: Wed, 30 May 2007 14:00:34 -0700
From: Stephen Hemminger <shemminger@...ux-foundation.org>
To: Patrick McHardy <kaber@...sh.net>
Cc: Herbert Xu <herbert.xu@...hat.com>,
"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
Michael Chan <mchan@...adcom.com>
Subject: Re: [RFC] IPV6 checksum offloading in network devices
This is better.
There is still a possiblity when a device allows IPV6 and not IPV4
checksumming, that the checksum will be done in the fixup code in
dev_queue_xmit.
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
---
drivers/net/bnx2.c | 6 +++---
drivers/net/tg3.c | 7 +++----
include/linux/netdevice.h | 8 ++++++--
net/bridge/br_if.c | 10 +++++++++-
net/core/dev.c | 24 +++++++++++++++++++++---
net/ipv4/af_inet.c | 3 +++
net/ipv4/ip_output.c | 2 +-
net/ipv4/netfilter/nf_nat_helper.c | 4 ++--
net/ipv6/ipv6_sockglue.c | 2 +-
9 files changed, 49 insertions(+), 17 deletions(-)
--- a/drivers/net/bnx2.c 2007-05-30 08:26:18.000000000 -0700
+++ b/drivers/net/bnx2.c 2007-05-30 08:26:32.000000000 -0700
@@ -6471,10 +6471,10 @@ bnx2_init_one(struct pci_dev *pdev, cons
memcpy(dev->perm_addr, bp->mac_addr, 6);
bp->name = board_info[ent->driver_data].name;
+ dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
if (CHIP_NUM(bp) == CHIP_NUM_5709)
- dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
- else
- dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
+ dev->features |= NETIF_F_IPV6_CSUM;
+
#ifdef BCM_VLAN
dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
#endif
--- a/drivers/net/tg3.c 2007-05-30 08:26:18.000000000 -0700
+++ b/drivers/net/tg3.c 2007-05-30 08:26:32.000000000 -0700
@@ -11959,12 +11959,11 @@ static int __devinit tg3_init_one(struct
* checksumming.
*/
if ((tp->tg3_flags & TG3_FLAG_BROKEN_CHECKSUMS) == 0) {
+ dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5755 ||
GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5787)
- dev->features |= NETIF_F_HW_CSUM;
- else
- dev->features |= NETIF_F_IP_CSUM;
- dev->features |= NETIF_F_SG;
+ dev->features |= NETIF_F_IPV6_CSUM;
+
tp->tg3_flags |= TG3_FLAG_RX_CHECKSUMS;
} else
tp->tg3_flags &= ~TG3_FLAG_RX_CHECKSUMS;
--- a/include/linux/netdevice.h 2007-05-30 08:26:18.000000000 -0700
+++ b/include/linux/netdevice.h 2007-05-30 10:10:57.000000000 -0700
@@ -314,9 +314,10 @@ struct net_device
/* Net device features */
unsigned long features;
#define NETIF_F_SG 1 /* Scatter/gather IO. */
-#define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */
+#define NETIF_F_IP_CSUM 2 /* Can checksum TCP/UDP over IPv4. */
#define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
#define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
+#define NETIF_F_IPV6_CSUM 16 /* Can checksum TCP/UDP over IPV6 */
#define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
#define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
#define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
@@ -338,8 +339,11 @@ struct net_device
/* List of features with software fallbacks. */
#define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
+
#define NETIF_F_GEN_CSUM (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
-#define NETIF_F_ALL_CSUM (NETIF_F_IP_CSUM | NETIF_F_GEN_CSUM)
+#define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
+#define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
+#define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
struct net_device *next_sched;
--- a/net/bridge/br_if.c 2007-05-30 08:26:18.000000000 -0700
+++ b/net/bridge/br_if.c 2007-05-30 10:07:22.000000000 -0700
@@ -368,10 +368,18 @@ void br_features_recompute(struct net_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;
--- a/net/core/dev.c 2007-05-30 08:26:18.000000000 -0700
+++ b/net/core/dev.c 2007-05-30 10:07:31.000000000 -0700
@@ -1509,9 +1509,11 @@ int dev_queue_xmit(struct sk_buff *skb)
skb_set_transport_header(skb, skb->csum_start -
skb_headroom(skb));
- if (!(dev->features & NETIF_F_GEN_CSUM) &&
- (!(dev->features & NETIF_F_IP_CSUM) ||
- skb->protocol != htons(ETH_P_IP)))
+ if (!(dev->features & NETIF_F_GEN_CSUM)
+ || ((dev->features & NETIF_F_IP_CSUM)
+ && skb->protocol == htons(ETH_P_IP))
+ || ((dev->features & NETIF_F_IPV6_CSUM)
+ && skb->protocol == htons(ETH_P_IPV6)))
if (skb_checksum_help(skb))
goto out_kfree_skb;
}
@@ -3105,6 +3107,22 @@ int register_netdevice(struct net_device
}
}
+ /* Fix illegal checksum combinations */
+ if ((dev->features & NETIF_F_HW_CSUM) &&
+ (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
+ printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
+ dev->name);
+ dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
+ }
+
+ if ((dev->features & NETIF_F_NO_CSUM) &&
+ (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
+ printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
+ dev->name);
+ dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
+ }
+
+
/* Fix illegal SG+CSUM combinations. */
if ((dev->features & NETIF_F_SG) &&
!(dev->features & NETIF_F_ALL_CSUM)) {
--- a/net/ipv6/ipv6_sockglue.c 2007-05-29 16:44:45.000000000 -0700
+++ b/net/ipv6/ipv6_sockglue.c 2007-05-30 09:54:52.000000000 -0700
@@ -123,7 +123,7 @@ static struct sk_buff *ipv6_gso_segment(
struct ipv6hdr *ipv6h;
struct inet6_protocol *ops;
- if (!(features & NETIF_F_HW_CSUM))
+ if (!(features & NETIF_F_V6_CSUM))
features &= ~NETIF_F_SG;
if (unlikely(skb_shinfo(skb)->gso_type &
--- a/net/ipv4/af_inet.c 2007-05-29 16:44:45.000000000 -0700
+++ b/net/ipv4/af_inet.c 2007-05-30 09:55:11.000000000 -0700
@@ -1170,6 +1170,9 @@ static struct sk_buff *inet_gso_segment(
int ihl;
int id;
+ if (!(features & NETIF_F_V4_CSUM))
+ features &= ~NETIF_F_SG;
+
if (unlikely(skb_shinfo(skb)->gso_type &
~(SKB_GSO_TCPV4 |
SKB_GSO_UDP |
--- a/net/ipv4/ip_output.c 2007-05-29 16:44:45.000000000 -0700
+++ b/net/ipv4/ip_output.c 2007-05-30 09:51:33.000000000 -0700
@@ -837,7 +837,7 @@ int ip_append_data(struct sock *sk,
*/
if (transhdrlen &&
length + fragheaderlen <= mtu &&
- rt->u.dst.dev->features & NETIF_F_ALL_CSUM &&
+ rt->u.dst.dev->features & NETIF_F_V4_CSUM &&
!exthdrlen)
csummode = CHECKSUM_PARTIAL;
--- a/net/ipv4/netfilter/nf_nat_helper.c 2007-05-29 16:44:45.000000000 -0700
+++ b/net/ipv4/netfilter/nf_nat_helper.c 2007-05-30 10:01:33.000000000 -0700
@@ -178,7 +178,7 @@ nf_nat_mangle_tcp_packet(struct sk_buff
datalen = (*pskb)->len - iph->ihl*4;
if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
if (!(rt->rt_flags & RTCF_LOCAL) &&
- (*pskb)->dev->features & NETIF_F_ALL_CSUM) {
+ (*pskb)->dev->features & NETIF_F_V4_CSUM) {
(*pskb)->ip_summed = CHECKSUM_PARTIAL;
(*pskb)->csum_start = skb_headroom(*pskb) +
skb_network_offset(*pskb) +
@@ -265,7 +265,7 @@ nf_nat_mangle_udp_packet(struct sk_buff
if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
if (!(rt->rt_flags & RTCF_LOCAL) &&
- (*pskb)->dev->features & NETIF_F_ALL_CSUM) {
+ (*pskb)->dev->features & NETIF_F_V4_CSUM) {
(*pskb)->ip_summed = CHECKSUM_PARTIAL;
(*pskb)->csum_start = skb_headroom(*pskb) +
skb_network_offset(*pskb) +
-
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