Re: [PATCH net-next 1/3] net: gro: set {inner_,}network_header in receive phase

Eric Dumazet
2024-02-29T20:15:46Z

On Thu, Feb 29, 2024 at 2:22 PM Richard Gobert <richardbgobert@gmail.com> wrote:
>
>
>
> Eric Dumazet wrote:
> >
> > My intuition is that this patch has a high cost for normal GRO processing.
> > SW-GRO is already a bottleneck on ARM cores in smart NICS.
> >
> > I would suggest instead using parameters to give both the nhoff and thoff values
> > this would avoid many conditionals in the fast path.
> >
> > ->
> >
> > INDIRECT_CALLABLE_SCOPE int udp6_gro_complete(struct sk_buff *skb, int
> > nhoff, int thoff)
> > {
> > const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)(skb->data + nhoff);
> > struct udphdr *uh = (struct udphdr *)(skb->data + thoff);
> > ...
> > }
> >
> > INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int
> > nhoff, int thoff)
> > {
> > const struct ipv6hdr *iph = (const struct ipv6hdr *)(skb->data + nhoff);
> > struct tcphdr *th = (struct tcphdr *)(skb->data + thoff);
> >
> > Why storing in skb fields things that really could be propagated more
> > efficiently as function parameters ?
>
> Hi Eric,
> Thanks for the review!
>
> I agree, the conditionals could be a problem and are actually not needed.
> The third commit in this patch series introduces an optimisation for
> ipv6/ipv4 using the correct {inner_}network_header. We can remove the
> conditionals; I thought about multiple ways to do so. First, remove the
> conditional in skb_gro_network_offset:
>
> static inline int skb_gro_network_offset(const struct sk_buff *skb)
> {
> const u32 mask = NAPI_GRO_CB(skb)->encap_mark - 1;
> return (skb_network_offset(skb) & mask) | (skb_inner_network_offset(skb) & ~mask);
> }

I was trying to say that we do not need all these helpers, storing
state in NAPI_GRO_CB(skb),
dirtying cache lines...

Ideally, the skb network/transport/... headers could be set at the
last stage, in gro_complete(big_gro_skb),
instead of doing this for each segment.

All the gro_receive() could be much faster by using additional
parameters (nhoff, thoff)

skb_gro_offset() could be replaced by the current offset (nhoff or
other name), passed as a parameter.

Here is a WIP for gro_complete() step, this looks large but this is
only adding a 2nd 'offset' parameter

Prior offset (typically network offset), called p_off
Old argument nhoff, (renamed thoff if that makes sense), pointing to
the current offset.

drivers/net/geneve.c | 6 +++---
drivers/net/vxlan/vxlan_core.c | 11 +++++++----
include/linux/etherdevice.h | 2 +-
include/linux/netdevice.h | 2 +-
include/linux/udp.h | 2 +-
include/net/gro.h | 10 +++++-----
include/net/inet_common.h | 2 +-
include/net/tcp.h | 4 ++--
include/net/udp.h | 8 ++++----
include/net/udp_tunnel.h | 2 +-
net/8021q/vlan_core.c | 4 ++--
net/core/gro.c | 2 +-
net/ethernet/eth.c | 4 ++--
net/ipv4/af_inet.c | 8 ++++----
net/ipv4/fou_core.c | 9 +++++----
net/ipv4/gre_offload.c | 4 ++--
net/ipv4/tcp_offload.c | 6 +++---
net/ipv4/udp.c | 3 ++-
net/ipv4/udp_offload.c | 24 ++++++++++++------------
net/ipv6/ip6_offload.c | 22 ++++++++++++----------
net/ipv6/tcpv6_offload.c | 7 ++++---
net/ipv6/udp.c | 3 ++-
net/ipv6/udp_offload.c | 12 ++++++------
23 files changed, 83 insertions(+), 74 deletions(-)

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 6f3f9b446b1d202f6c71a20ce48088691e9120bf..af8dfdd47ffdeb7bdea302c5957e81faf83b19db
100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -546,7 +546,7 @@ static struct sk_buff *geneve_gro_receive(struct sock *sk,
}

static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
- int nhoff)
+ int p_off, int nhoff)
{
struct genevehdr *gh;
struct packet_offload *ptype;
@@ -560,11 +560,11 @@ static int geneve_gro_complete(struct sock *sk,
struct sk_buff *skb,

/* since skb->encapsulation is set, eth_gro_complete() sets
the inner mac header */
if (likely(type == htons(ETH_P_TEB)))
- return eth_gro_complete(skb, nhoff + gh_len);
+ return eth_gro_complete(skb, p_off, nhoff + gh_len);

ptype = gro_find_complete_by_type(type);
if (ptype)
- err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
+ err = ptype->callbacks.gro_complete(skb, p_off, nhoff + gh_len);

skb_set_inner_mac_header(skb, nhoff + gh_len);

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 386cbe4d33272791e80470bd1378731d0c3b4d3b..84c123405b70f986a40b9f531e826807bcfc880b
100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -767,15 +767,17 @@ static struct sk_buff
*vxlan_gpe_gro_receive(struct sock *sk,
return pp;
}

-static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
+static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb,
+ int p_off, int nhoff)
{
/* Sets 'skb->inner_mac_header' since we are always called with
* 'skb->encapsulation' set.
*/
- return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
+ return eth_gro_complete(skb, p_off, nhoff + sizeof(struct vxlanhdr));
}

-static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff
*skb, int nhoff)
+static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff *skb,
+ int p_off, int nhoff)
{
struct vxlanhdr *vh = (struct vxlanhdr *)(skb->data + nhoff);
const struct packet_offload *ptype;
@@ -786,7 +788,8 @@ static int vxlan_gpe_gro_complete(struct sock *sk,
struct sk_buff *skb, int nhof
return err;
ptype = gro_find_complete_by_type(protocol);
if (ptype)
- err = ptype->callbacks.gro_complete(skb, nhoff +
sizeof(struct vxlanhdr));
+ err = ptype->callbacks.gro_complete(skb, p_off, nhoff +
+ sizeof(struct vxlanhdr));
return err;
}

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 224645f17c333b2311573197a28b41701eb35f92..b081b43d9686a1f3b0ddc9d84e66566e297a2d67
100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -64,7 +64,7 @@ struct net_device *devm_alloc_etherdev_mqs(struct
device *dev, int sizeof_priv,
#define devm_alloc_etherdev(dev, sizeof_priv)
devm_alloc_etherdev_mqs(dev, sizeof_priv, 1, 1)

struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb);
-int eth_gro_complete(struct sk_buff *skb, int nhoff);
+int eth_gro_complete(struct sk_buff *skb, int p_off, int nhoff);

/* Reserved Ethernet Addresses per IEEE 802.1Q */
static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) =
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 09023e44db4e2c3a2133afc52ba5a335d6030646..b21745f6233a2b56a64adda9f303d4db22019a37
100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2788,7 +2788,7 @@ struct offload_callbacks {
netdev_features_t features);
struct sk_buff *(*gro_receive)(struct list_head *head,
struct sk_buff *skb);
- int (*gro_complete)(struct sk_buff *skb, int nhoff);
+ int (*gro_complete)(struct sk_buff *skb,
int nhoff, int thoff);
};

struct packet_offload {
diff --git a/include/linux/udp.h b/include/linux/udp.h
index 3748e82b627b7044508db66adbf77c54a8e3d612..a04d94a3b42f8f5fb3d85622d2f3e56a94c4ea86
100644
--- a/include/linux/udp.h
+++ b/include/linux/udp.h
@@ -82,7 +82,7 @@ struct udp_sock {
struct sk_buff *skb);
int (*gro_complete)(struct sock *sk,
struct sk_buff *skb,
- int nhoff);
+ int nhoff, int thoff);

/* udp_recvmsg try to use this before splicing sk_receive_queue */
struct sk_buff_head reader_queue ____cacheline_aligned_in_smp;
diff --git a/include/net/gro.h b/include/net/gro.h
index b435f0ddbf64f7bf740b7e479a1b28bcdef122c6..2856b00b84dfbf122871ef9bedab2097a7c823eb
100644
--- a/include/net/gro.h
+++ b/include/net/gro.h
@@ -385,18 +385,18 @@ static inline void
skb_gro_flush_final_remcsum(struct sk_buff *skb,

INDIRECT_CALLABLE_DECLARE(struct sk_buff *ipv6_gro_receive(struct list_head *,
struct sk_buff *));
-INDIRECT_CALLABLE_DECLARE(int ipv6_gro_complete(struct sk_buff *, int));
+INDIRECT_CALLABLE_DECLARE(int ipv6_gro_complete(struct sk_buff *, int, int));
INDIRECT_CALLABLE_DECLARE(struct sk_buff *inet_gro_receive(struct list_head *,
struct sk_buff *));
-INDIRECT_CALLABLE_DECLARE(int inet_gro_complete(struct sk_buff *, int));
+INDIRECT_CALLABLE_DECLARE(int inet_gro_complete(struct sk_buff *, int, int));

INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *,
struct sk_buff *));
-INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int));
+INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int, int));

INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp6_gro_receive(struct list_head *,
struct sk_buff *));
-INDIRECT_CALLABLE_DECLARE(int udp6_gro_complete(struct sk_buff *, int));
+INDIRECT_CALLABLE_DECLARE(int udp6_gro_complete(struct sk_buff *, int, int));

#define indirect_call_gro_receive_inet(cb, f2, f1, head, skb) \
({ \
@@ -407,7 +407,7 @@ INDIRECT_CALLABLE_DECLARE(int
udp6_gro_complete(struct sk_buff *, int));

struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb,
struct udphdr *uh, struct sock *sk);
-int udp_gro_complete(struct sk_buff *skb, int nhoff, udp_lookup_t lookup);
+int udp_gro_complete(struct sk_buff *skb, int nhoff, int thoff,
udp_lookup_t lookup);

static inline struct udphdr *udp_gro_udphdr(struct sk_buff *skb)
{
diff --git a/include/net/inet_common.h b/include/net/inet_common.h
index f50a644d87a9871fbed2dfd49d4bde9d3df0fd92..605f917c830c9b1794dfc3bda1bdc9ac24a0def3
100644
--- a/include/net/inet_common.h
+++ b/include/net/inet_common.h
@@ -64,7 +64,7 @@ int inet_recv_error(struct sock *sk, struct msghdr
*msg, int len,
int *addr_len);

struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb);
-int inet_gro_complete(struct sk_buff *skb, int nhoff);
+int inet_gro_complete(struct sk_buff *skb, int nhoff, int thoff);
struct sk_buff *inet_gso_segment(struct sk_buff *skb,
netdev_features_t features);

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 6ae35199d3b3c159ba029ff74b109c56a7c7d2fc..ad8e6efc8bd867ada990820b5badce96ee49c3da
100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2196,9 +2196,9 @@ void tcp_v4_destroy_sock(struct sock *sk);
struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
netdev_features_t features);
struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb);
-INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *skb,
int thoff));
+INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *skb,
int nhoff, int thoff));
INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct
list_head *head, struct sk_buff *skb));
-INDIRECT_CALLABLE_DECLARE(int tcp6_gro_complete(struct sk_buff *skb,
int thoff));
+INDIRECT_CALLABLE_DECLARE(int tcp6_gro_complete(struct sk_buff *skb,
int nhoff, int thoff));
INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp6_gro_receive(struct
list_head *head, struct sk_buff *skb));
#ifdef CONFIG_INET
void tcp_gro_complete(struct sk_buff *skb);
diff --git a/include/net/udp.h b/include/net/udp.h
index 488a6d2babccf26edfbaecc525f25e03d86b7d62..601d1c3b677a9acd6b6615e64de3f034f940287d
100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -166,8 +166,8 @@ static inline void udp_csum_pull_header(struct sk_buff *skb)
UDP_SKB_CB(skb)->cscov -= sizeof(struct udphdr);
}

-typedef struct sock *(*udp_lookup_t)(const struct sk_buff *skb, __be16 sport,
- __be16 dport);
+typedef struct sock *(*udp_lookup_t)(const struct sk_buff *skb, int nhoff,
+ __be16 sport, __be16 dport);

void udp_v6_early_demux(struct sk_buff *skb);
INDIRECT_CALLABLE_DECLARE(int udpv6_rcv(struct sk_buff *));
@@ -301,7 +301,7 @@ struct sock *udp4_lib_lookup(struct net *net,
__be32 saddr, __be16 sport,
struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
__be32 daddr, __be16 dport, int dif, int sdif,
struct udp_table *tbl, struct sk_buff *skb);
-struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb,
+struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb, int nhoff,
__be16 sport, __be16 dport);
struct sock *udp6_lib_lookup(struct net *net,
const struct in6_addr *saddr, __be16 sport,
@@ -312,7 +312,7 @@ struct sock *__udp6_lib_lookup(struct net *net,
const struct in6_addr *daddr, __be16 dport,
int dif, int sdif, struct udp_table *tbl,
struct sk_buff *skb);
-struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
+struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, int nhoff,
__be16 sport, __be16 dport);
int udp_read_skb(struct sock *sk, skb_read_actor_t recv_actor);

diff --git a/include/net/udp_tunnel.h b/include/net/udp_tunnel.h
index d716214fe03df0a56266c22c7e8b42ba650e728b..a641392e70b0aa3d01826430640f3db6557d604b
100644
--- a/include/net/udp_tunnel.h
+++ b/include/net/udp_tunnel.h
@@ -75,7 +75,7 @@ typedef struct sk_buff
*(*udp_tunnel_gro_receive_t)(struct sock *sk,
struct list_head *head,
struct sk_buff *skb);
typedef int (*udp_tunnel_gro_complete_t)(struct sock *sk, struct sk_buff *skb,
- int nhoff);
+ int nhoff, int thoff);

struct udp_tunnel_sock_cfg {
void *sk_user_data; /* user data used by encap_rcv call back */
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index f001582345052f8c26e008058ae5f721f8bc224d..247704cf70aff1279c62507a940581e5049175b9
100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -510,7 +510,7 @@ static struct sk_buff *vlan_gro_receive(struct
list_head *head,
return pp;
}

-static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
+static int vlan_gro_complete(struct sk_buff *skb, int p_off, int nhoff)
{
struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff);
__be16 type = vhdr->h_vlan_encapsulated_proto;
@@ -521,7 +521,7 @@ static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
if (ptype)
err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
ipv6_gro_complete, inet_gro_complete,
- skb, nhoff + sizeof(*vhdr));
+ skb, p_off, nhoff + sizeof(*vhdr));

return err;
}
diff --git a/net/core/gro.c b/net/core/gro.c
index 0759277dc14ee65d0a5376d48694cc1cccaee959..07768055ecf25d426e7cd01551f32978a70e8379
100644
--- a/net/core/gro.c
+++ b/net/core/gro.c
@@ -254,7 +254,7 @@ static void napi_gro_complete(struct napi_struct
*napi, struct sk_buff *skb)

err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
ipv6_gro_complete, inet_gro_complete,
- skb, 0);
+ skb, 0, 0);
break;
}
rcu_read_unlock();
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 2edc8b796a4e7326aa44128a0618e15b9aa817de..7515e6bcbb7d1e62fa0af2fd477bdea0284bfe40
100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -453,7 +453,7 @@ struct sk_buff *eth_gro_receive(struct list_head
*head, struct sk_buff *skb)
}
EXPORT_SYMBOL(eth_gro_receive);

-int eth_gro_complete(struct sk_buff *skb, int nhoff)
+int eth_gro_complete(struct sk_buff *skb, int p_off, int nhoff)
{
struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff);
__be16 type = eh->h_proto;
@@ -467,7 +467,7 @@ int eth_gro_complete(struct sk_buff *skb, int nhoff)
if (ptype != NULL)
err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
ipv6_gro_complete, inet_gro_complete,
- skb, nhoff + sizeof(*eh));
+ skb, p_off, nhoff + sizeof(*eh));

return err;
}
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 5daebdcbca326aa1fc042e1e1ff1e82a18bd283d..bef9b222f3c90487c7d44015efb23c08168cf164
100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1640,7 +1640,7 @@ int inet_recv_error(struct sock *sk, struct
msghdr *msg, int len, int *addr_len)
}
EXPORT_SYMBOL(inet_recv_error);

-int inet_gro_complete(struct sk_buff *skb, int nhoff)
+int inet_gro_complete(struct sk_buff *skb, int prior_off, int nhoff)
{
struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
const struct net_offload *ops;
@@ -1666,17 +1666,17 @@ int inet_gro_complete(struct sk_buff *skb, int nhoff)
*/
err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
tcp4_gro_complete, udp4_gro_complete,
- skb, nhoff + sizeof(*iph));
+ skb, nhoff, nhoff + sizeof(*iph));

out:
return err;
}

-static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
+static int ipip_gro_complete(struct sk_buff *skb, int prior_off, int nhoff)
{
skb->encapsulation = 1;
skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
- return inet_gro_complete(skb, nhoff);
+ return inet_gro_complete(skb, prior_off, nhoff);
}

int inet_ctl_sock_create(struct sock **sk, unsigned short family,
diff --git a/net/ipv4/fou_core.c b/net/ipv4/fou_core.c
index 0c41076e31edadd16f8e55ebc50f84db262a2f0d..ac4a6595d5cdf7e1e4b0eef417173d8d2d4ad76d
100644
--- a/net/ipv4/fou_core.c
+++ b/net/ipv4/fou_core.c
@@ -260,7 +260,7 @@ static struct sk_buff *fou_gro_receive(struct sock *sk,
}

static int fou_gro_complete(struct sock *sk, struct sk_buff *skb,
- int nhoff)
+ int p_off, int nhoff)
{
const struct net_offload __rcu **offloads;
u8 proto = fou_from_sock(sk)->protocol;
@@ -272,7 +272,7 @@ static int fou_gro_complete(struct sock *sk,
struct sk_buff *skb,
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
goto out;

- err = ops->callbacks.gro_complete(skb, nhoff);
+ err = ops->callbacks.gro_complete(skb, p_off, nhoff);

skb_set_inner_mac_header(skb, nhoff);

@@ -445,7 +445,8 @@ static struct sk_buff *gue_gro_receive(struct sock *sk,
return pp;
}

-static int gue_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
+static int gue_gro_complete(struct sock *sk, struct sk_buff *skb,
+ int p_off, int nhoff)
{
struct guehdr *guehdr = (struct guehdr *)(skb->data + nhoff);
const struct net_offload __rcu **offloads;
@@ -480,7 +481,7 @@ static int gue_gro_complete(struct sock *sk,
struct sk_buff *skb, int nhoff)
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
goto out;

- err = ops->callbacks.gro_complete(skb, nhoff + guehlen);
+ err = ops->callbacks.gro_complete(skb, p_off, nhoff + guehlen);

skb_set_inner_mac_header(skb, nhoff + guehlen);

diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
index 311e70bfce407a2cadaa33fbef9a3976375711f4..803a8498f3030ec80a0ed41313e314021416a207
100644
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -233,7 +233,7 @@ static struct sk_buff *gre_gro_receive(struct
list_head *head,
return pp;
}

-static int gre_gro_complete(struct sk_buff *skb, int nhoff)
+static int gre_gro_complete(struct sk_buff *skb, int p_off, int nhoff)
{
struct gre_base_hdr *greh = (struct gre_base_hdr *)(skb->data + nhoff);
struct packet_offload *ptype;
@@ -253,7 +253,7 @@ static int gre_gro_complete(struct sk_buff *skb, int nhoff)

ptype = gro_find_complete_by_type(type);
if (ptype)
- err = ptype->callbacks.gro_complete(skb, nhoff + grehlen);
+ err = ptype->callbacks.gro_complete(skb, p_off, nhoff
+ grehlen);

skb_set_inner_mac_header(skb, nhoff + grehlen);

diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
index 8311c38267b55ba97e59924c3c1c5b59f133fdcd..6f126f7d806d60e4d884c4f95b53b8e4bd9fbb8a
100644
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -328,10 +328,10 @@ struct sk_buff *tcp4_gro_receive(struct
list_head *head, struct sk_buff *skb)
return tcp_gro_receive(head, skb);
}

-INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff)
+INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb,
int nhoff, int thoff)
{
- const struct iphdr *iph = ip_hdr(skb);
- struct tcphdr *th = tcp_hdr(skb);
+ const struct iphdr *iph = (const struct iphdr *)(skb->data + nhoff);
+ struct tcphdr *th = (struct tcphdr *)(skb->data + thoff);

th->check = ~tcp_v4_check(skb->len - thoff, iph->saddr,
iph->daddr, 0);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index a8acea17b4e5344d022ae8f8eb674d1a36f8035a..70a6d174855f76fb5dd289e3ef222a5158890e4f
100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -532,9 +532,10 @@ static inline struct sock
*__udp4_lib_lookup_skb(struct sk_buff *skb,
}

struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb,
+ int nhoff,
__be16 sport, __be16 dport)
{
- const struct iphdr *iph = ip_hdr(skb);
+ const struct iphdr *iph = (const struct iphdr *)(skb->data + nhoff);
struct net *net = dev_net(skb->dev);
int iif, sdif;

diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 6c95d28d0c4a7e56d587a986113b3711f8de964c..fa82a5a08688086415bae1d425d034f12311b0ab
100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -669,18 +669,18 @@ static int udp_gro_complete_segment(struct sk_buff *skb)
return 0;
}

-int udp_gro_complete(struct sk_buff *skb, int nhoff,
+int udp_gro_complete(struct sk_buff *skb, int nhoff, int thoff,
udp_lookup_t lookup)
{
- __be16 newlen = htons(skb->len - nhoff);
- struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
+ struct udphdr *uh = (struct udphdr *)(skb->data + thoff);
+ __be16 newlen = htons(skb->len - thoff);
struct sock *sk;
int err;

uh->len = newlen;

sk = INDIRECT_CALL_INET(lookup, udp6_lib_lookup_skb,
- udp4_lib_lookup_skb, skb, uh->source, uh->dest);
+ udp4_lib_lookup_skb, skb, nhoff,
uh->source, uh->dest);
if (sk && udp_sk(sk)->gro_complete) {
skb_shinfo(skb)->gso_type = uh->check ? SKB_GSO_UDP_TUNNEL_CSUM
: SKB_GSO_UDP_TUNNEL;
@@ -694,8 +694,8 @@ int udp_gro_complete(struct sk_buff *skb, int nhoff,
* functions to make them set up the inner offsets.
*/
skb->encapsulation = 1;
- err = udp_sk(sk)->gro_complete(sk, skb,
- nhoff + sizeof(struct udphdr));
+ err = udp_sk(sk)->gro_complete(sk, skb, nhoff,
+ thoff + sizeof(struct udphdr));
} else {
err = udp_gro_complete_segment(skb);
}
@@ -707,14 +707,14 @@ int udp_gro_complete(struct sk_buff *skb, int nhoff,
}
EXPORT_SYMBOL(udp_gro_complete);

-INDIRECT_CALLABLE_SCOPE int udp4_gro_complete(struct sk_buff *skb, int nhoff)
+INDIRECT_CALLABLE_SCOPE int udp4_gro_complete(struct sk_buff *skb,
int nhoff, int thoff)
{
- const struct iphdr *iph = ip_hdr(skb);
- struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
+ const struct iphdr *iph = (const struct iphdr *)(skb->data + nhoff);
+ struct udphdr *uh = (struct udphdr *)(skb->data + thoff);

/* do fraglist only if there is no outer UDP encap (or we
already processed it) */
if (NAPI_GRO_CB(skb)->is_flist && !NAPI_GRO_CB(skb)->encap_mark) {
- uh->len = htons(skb->len - nhoff);
+ uh->len = htons(skb->len - thoff);

skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4);
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
@@ -731,10 +731,10 @@ INDIRECT_CALLABLE_SCOPE int
udp4_gro_complete(struct sk_buff *skb, int nhoff)
}

if (uh->check)
- uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr,
+ uh->check = ~udp_v4_check(skb->len - thoff, iph->saddr,
iph->daddr, 0);

- return udp_gro_complete(skb, nhoff, udp4_lib_lookup_skb);
+ return udp_gro_complete(skb, nhoff, thoff, udp4_lib_lookup_skb);
}

static const struct net_offload udpv4_offload = {
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index cca64c7809bee9a0360cbfab6a645d3f8d2ffea3..e3a05b84c76ab9d55afafa94a53130b3b0d6c7f7
100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -346,12 +346,14 @@ static struct sk_buff *ip4ip6_gro_receive(struct
list_head *head,
return inet_gro_receive(head, skb);
}

-INDIRECT_CALLABLE_SCOPE int ipv6_gro_complete(struct sk_buff *skb, int nhoff)
+INDIRECT_CALLABLE_SCOPE int ipv6_gro_complete(struct sk_buff *skb,
+ int p_off, int nhoff)
{
const struct net_offload *ops;
struct ipv6hdr *iph;
int err = -ENOSYS;
u32 payload_len;
+ int nhlen;

if (skb->encapsulation) {
skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IPV6));
@@ -387,36 +389,36 @@ INDIRECT_CALLABLE_SCOPE int
ipv6_gro_complete(struct sk_buff *skb, int nhoff)
iph->payload_len = htons(payload_len);
}

- nhoff += sizeof(*iph) + ipv6_exthdrs_len(iph, &ops);
- if (WARN_ON(!ops || !ops->callbacks.gro_complete))
+ nhlen = sizeof(*iph) + ipv6_exthdrs_len(iph, &ops);
+ if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_complete))
goto out;

err = INDIRECT_CALL_L4(ops->callbacks.gro_complete, tcp6_gro_complete,
- udp6_gro_complete, skb, nhoff);
+ udp6_gro_complete, skb, nhoff, nhoff + nhlen);

out:
return err;
}

-static int sit_gro_complete(struct sk_buff *skb, int nhoff)
+static int sit_gro_complete(struct sk_buff *skb, int p_off, int nhoff)
{
skb->encapsulation = 1;
skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
- return ipv6_gro_complete(skb, nhoff);
+ return ipv6_gro_complete(skb, p_off, nhoff);
}

-static int ip6ip6_gro_complete(struct sk_buff *skb, int nhoff)
+static int ip6ip6_gro_complete(struct sk_buff *skb, int p_off, int nhoff)
{
skb->encapsulation = 1;
skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6;
- return ipv6_gro_complete(skb, nhoff);
+ return ipv6_gro_complete(skb, p_off, nhoff);
}

-static int ip4ip6_gro_complete(struct sk_buff *skb, int nhoff)
+static int ip4ip6_gro_complete(struct sk_buff *skb, int p_off, int nhoff)
{
skb->encapsulation = 1;
skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6;
- return inet_gro_complete(skb, nhoff);
+ return inet_gro_complete(skb, p_off, nhoff);
}

static struct packet_offload ipv6_packet_offload __read_mostly = {
diff --git a/net/ipv6/tcpv6_offload.c b/net/ipv6/tcpv6_offload.c
index bf0c957e4b5eaaabc0ac3a7e55c7de6608cec156..5043d2ff34eb8a7f9aeb7db6b4347a0f976b8502
100644
--- a/net/ipv6/tcpv6_offload.c
+++ b/net/ipv6/tcpv6_offload.c
@@ -27,10 +27,11 @@ struct sk_buff *tcp6_gro_receive(struct list_head
*head, struct sk_buff *skb)
return tcp_gro_receive(head, skb);
}

-INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff)
+INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb,
+ int nhoff, int thoff)
{
- const struct ipv6hdr *iph = ipv6_hdr(skb);
- struct tcphdr *th = tcp_hdr(skb);
+ const struct ipv6hdr *iph = (const struct ipv6hdr *)(skb->data + nhoff);
+ struct tcphdr *th = (struct tcphdr *)(skb->data + thoff);

th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr,
&iph->daddr, 0);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 3f2249b4cd5f6a594dd9768e29f20f0d9a57faed..400243c89d8234ff98b3991c049e83237fa6686f
100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -273,9 +273,10 @@ static struct sock *__udp6_lib_lookup_skb(struct
sk_buff *skb,
}

struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
+ int nhoff,
__be16 sport, __be16 dport)
{
- const struct ipv6hdr *iph = ipv6_hdr(skb);
+ const struct ipv6hdr *iph = (const struct ipv6hdr *)(skb->data + nhoff);
struct net *net = dev_net(skb->dev);
int iif, sdif;

diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index 6b95ba241ebe2af7e5f2760d8a9c1d78f08579c5..7bf0fb609451586ab9fb1de955d1ae2ea2dbee64
100644
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -162,14 +162,14 @@ struct sk_buff *udp6_gro_receive(struct
list_head *head, struct sk_buff *skb)
return NULL;
}

-INDIRECT_CALLABLE_SCOPE int udp6_gro_complete(struct sk_buff *skb, int nhoff)
+INDIRECT_CALLABLE_SCOPE int udp6_gro_complete(struct sk_buff *skb,
int nhoff, int thoff)
{
- const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
- struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
+ const struct ipv6hdr *ipv6h = (const struct ipv6hdr
*)(skb->data + nhoff);
+ struct udphdr *uh = (struct udphdr *)(skb->data + thoff);

/* do fraglist only if there is no outer UDP encap (or we
already processed it) */
if (NAPI_GRO_CB(skb)->is_flist && !NAPI_GRO_CB(skb)->encap_mark) {
- uh->len = htons(skb->len - nhoff);
+ uh->len = htons(skb->len - thoff);

skb_shinfo(skb)->gso_type |= (SKB_GSO_FRAGLIST|SKB_GSO_UDP_L4);
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
@@ -186,10 +186,10 @@ INDIRECT_CALLABLE_SCOPE int
udp6_gro_complete(struct sk_buff *skb, int nhoff)
}

if (uh->check)
- uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr,
+ uh->check = ~udp_v6_check(skb->len - thoff, &ipv6h->saddr,
&ipv6h->daddr, 0);

- return udp_gro_complete(skb, nhoff, udp6_lib_lookup_skb);
+ return udp_gro_complete(skb, nhoff, thoff, udp6_lib_lookup_skb);
}

static const struct net_offload udpv6_offload = {