diff mbox series

[net-next,v8,1/3] net: gro: use cb instead of skb->network_header

Message ID 20240506093550.128210-2-richardbgobert@gmail.com (mailing list archive)
State New
Headers show
Series net: gro: remove network_header use, move p->{flush/flush_id} calculations to L4 | expand

Commit Message

Richard Gobert May 6, 2024, 9:35 a.m. UTC 
This patch converts references of skb->network_header to napi_gro_cb's
network_offset and inner_network_offset.

Signed-off-by: Richard Gobert <richardbgobert@gmail.com>
---
 include/net/gro.h        | 9 +++++++--
 net/ipv4/af_inet.c       | 4 ----
 net/ipv4/tcp_offload.c   | 3 ++-
 net/ipv6/ip6_offload.c   | 5 ++---
 net/ipv6/tcpv6_offload.c | 3 ++-
 5 files changed, 13 insertions(+), 11 deletions(-)

Comments

Willem de Bruijn May 6, 2024, 4:46 p.m. UTC | #1 
Richard Gobert wrote:
> This patch converts references of skb->network_header to napi_gro_cb's
> network_offset and inner_network_offset.
> 
> Signed-off-by: Richard Gobert <richardbgobert@gmail.com>
> ---
>  include/net/gro.h        | 9 +++++++--
>  net/ipv4/af_inet.c       | 4 ----
>  net/ipv4/tcp_offload.c   | 3 ++-
>  net/ipv6/ip6_offload.c   | 5 ++---
>  net/ipv6/tcpv6_offload.c | 3 ++-
>  5 files changed, 13 insertions(+), 11 deletions(-)
> 
> diff --git a/include/net/gro.h b/include/net/gro.h
> index c1d4ca0463a1..1faff23b66e8 100644
> --- a/include/net/gro.h
> +++ b/include/net/gro.h
> @@ -181,12 +181,17 @@ static inline void *skb_gro_header(struct sk_buff *skb, unsigned int hlen,
>  	return ptr;
>  }
>  
> +static inline int skb_gro_network_offset(const struct sk_buff *skb)
> +{
> +	return NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark];
> +}
> +

The fact that .._receive sets encap_mark, but .._complete must read
encapsulation, due to the clear in udp_gro_complete, is non-obvious.

Can you add a comment to clarify this or rename this to
skb_gro_receive_network_offset?

>  static inline void *skb_gro_network_header(const struct sk_buff *skb)
>  {
>  	if (skb_gro_may_pull(skb, skb_gro_offset(skb)))
> -		return skb_gro_header_fast(skb, skb_network_offset(skb));
> +		return skb_gro_header_fast(skb, skb_gro_network_offset(skb));
>  
> -	return skb_network_header(skb);
> +	return skb->data + skb_gro_network_offset(skb);
>  }
Richard Gobert May 7, 2024, 4:11 p.m. UTC | #2 
Willem de Bruijn wrote:
> Richard Gobert wrote:
>> This patch converts references of skb->network_header to napi_gro_cb's
>> network_offset and inner_network_offset.
>>
>> Signed-off-by: Richard Gobert <richardbgobert@gmail.com>
>> ---
>>  include/net/gro.h        | 9 +++++++--
>>  net/ipv4/af_inet.c       | 4 ----
>>  net/ipv4/tcp_offload.c   | 3 ++-
>>  net/ipv6/ip6_offload.c   | 5 ++---
>>  net/ipv6/tcpv6_offload.c | 3 ++-
>>  5 files changed, 13 insertions(+), 11 deletions(-)
>>
>> diff --git a/include/net/gro.h b/include/net/gro.h
>> index c1d4ca0463a1..1faff23b66e8 100644
>> --- a/include/net/gro.h
>> +++ b/include/net/gro.h
>> @@ -181,12 +181,17 @@ static inline void *skb_gro_header(struct sk_buff *skb, unsigned int hlen,
>>  	return ptr;
>>  }
>>  
>> +static inline int skb_gro_network_offset(const struct sk_buff *skb)
>> +{
>> +	return NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark];
>> +}
>> +
> 
> The fact that .._receive sets encap_mark, but .._complete must read
> encapsulation, due to the clear in udp_gro_complete, is non-obvious.
> 
> Can you add a comment to clarify this or rename this to
> skb_gro_receive_network_offset?
> 

I'll rename that to skb_gro_receive_network_offset for better clarity,
thanks.

>>  static inline void *skb_gro_network_header(const struct sk_buff *skb)
>>  {
>>  	if (skb_gro_may_pull(skb, skb_gro_offset(skb)))
>> -		return skb_gro_header_fast(skb, skb_network_offset(skb));
>> +		return skb_gro_header_fast(skb, skb_gro_network_offset(skb));
>>  
>> -	return skb_network_header(skb);
>> +	return skb->data + skb_gro_network_offset(skb);
>>  }
diff mbox series

Patch

diff --git a/include/net/gro.h b/include/net/gro.h
index c1d4ca0463a1..1faff23b66e8 100644
--- a/include/net/gro.h
+++ b/include/net/gro.h
@@ -181,12 +181,17 @@  static inline void *skb_gro_header(struct sk_buff *skb, unsigned int hlen,
 	return ptr;
 }
 
+static inline int skb_gro_network_offset(const struct sk_buff *skb)
+{
+	return NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark];
+}
+
 static inline void *skb_gro_network_header(const struct sk_buff *skb)
 {
 	if (skb_gro_may_pull(skb, skb_gro_offset(skb)))
-		return skb_gro_header_fast(skb, skb_network_offset(skb));
+		return skb_gro_header_fast(skb, skb_gro_network_offset(skb));
 
-	return skb_network_header(skb);
+	return skb->data + skb_gro_network_offset(skb);
 }
 
 static inline __wsum inet_gro_compute_pseudo(const struct sk_buff *skb,
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index a7bad18bc8b5..428196e1541f 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1569,10 +1569,6 @@  struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
 
 	NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
 	NAPI_GRO_CB(skb)->flush |= flush;
-	skb_set_network_header(skb, off);
-	/* The above will be needed by the transport layer if there is one
-	 * immediately following this IP hdr.
-	 */
 	NAPI_GRO_CB(skb)->inner_network_offset = off;
 
 	/* Note : No need to call skb_gro_postpull_rcsum() here,
diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
index fab0973f995b..b70ae50e658d 100644
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -330,7 +330,8 @@  struct sk_buff *tcp4_gro_receive(struct list_head *head, struct sk_buff *skb)
 
 INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff)
 {
-	const struct iphdr *iph = ip_hdr(skb);
+	const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation];
+	const struct iphdr *iph = (struct iphdr *)(skb->data + offset);
 	struct tcphdr *th = tcp_hdr(skb);
 
 	th->check = ~tcp_v4_check(skb->len - thoff, iph->saddr,
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index c8b909a9904f..5d6b875a4638 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -67,7 +67,7 @@  static int ipv6_gro_pull_exthdrs(struct sk_buff *skb, int off, int proto)
 		off += len;
 	}
 
-	skb_gro_pull(skb, off - skb_network_offset(skb));
+	skb_gro_pull(skb, off - skb_gro_network_offset(skb));
 	return proto;
 }
 
@@ -236,7 +236,6 @@  INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head,
 	if (unlikely(!iph))
 		goto out;
 
-	skb_set_network_header(skb, off);
 	NAPI_GRO_CB(skb)->inner_network_offset = off;
 
 	flush += ntohs(iph->payload_len) != skb->len - hlen;
@@ -260,7 +259,7 @@  INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head,
 	NAPI_GRO_CB(skb)->proto = proto;
 
 	flush--;
-	nlen = skb_network_header_len(skb);
+	nlen = skb_gro_offset(skb) - off;
 
 	list_for_each_entry(p, head, list) {
 		const struct ipv6hdr *iph2;
diff --git a/net/ipv6/tcpv6_offload.c b/net/ipv6/tcpv6_offload.c
index 4b07d1e6c952..e70d60e0f86f 100644
--- a/net/ipv6/tcpv6_offload.c
+++ b/net/ipv6/tcpv6_offload.c
@@ -29,7 +29,8 @@  struct sk_buff *tcp6_gro_receive(struct list_head *head, struct sk_buff *skb)
 
 INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff)
 {
-	const struct ipv6hdr *iph = ipv6_hdr(skb);
+	const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation];
+	const struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + offset);
 	struct tcphdr *th = tcp_hdr(skb);
 
 	th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr,