AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

ipv6: Add GRO support

Browse Source 
This patch adds GRO support for IPv6.  IPv6 GRO supports extension
headers in the same way as GSO (by using the same infrastructure).
It's also simpler compared to IPv4 since we no longer have to worry
about fragmentation attributes or header checksums.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2009-01-08 10:40:57 -08:00 committed by David S. Miller
parent d9d6f46b42
commit 787e920836
2 changed files with 105 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/protocol.h
View File

@ -59,6 +59,9 @@ struct inet6_protocol
int (*gso_send_check)(struct sk_buff *skb);
struct sk_buff *(*gso_segment)(struct sk_buff *skb,
int features);
struct sk_buff **(*gro_receive)(struct sk_buff **head,
struct sk_buff *skb);
int (*gro_complete)(struct sk_buff *skb);
unsigned int flags; /* INET6_PROTO_xxx */
};

107
net/ipv6/af_inet6.c
View File

@ -672,8 +672,7 @@ int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
int proto)
static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
{
struct inet6_protocol *ops = NULL;
@ -704,7 +703,7 @@ static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
__skb_pull(skb, len);
}
return ops;
return proto;
}
static int ipv6_gso_send_check(struct sk_buff *skb)
@ -721,7 +720,9 @@ static int ipv6_gso_send_check(struct sk_buff *skb)
err = -EPROTONOSUPPORT;
rcu_read_lock();
ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
ops = rcu_dereference(inet6_protos[
ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
if (likely(ops && ops->gso_send_check)) {
skb_reset_transport_header(skb);
err = ops->gso_send_check(skb);
@ -757,7 +758,9 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
segs = ERR_PTR(-EPROTONOSUPPORT);
rcu_read_lock();
ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
ops = rcu_dereference(inet6_protos[
ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
if (likely(ops && ops->gso_segment)) {
skb_reset_transport_header(skb);
segs = ops->gso_segment(skb, features);
@ -777,11 +780,105 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
return segs;
}
struct ipv6_gro_cb {
struct napi_gro_cb napi;
int proto;
};
#define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
struct sk_buff *skb)
{
struct inet6_protocol *ops;
struct sk_buff **pp = NULL;
struct sk_buff *p;
struct ipv6hdr *iph;
unsigned int nlen;
int flush = 1;
int proto;
if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
goto out;
iph = ipv6_hdr(skb);
__skb_pull(skb, sizeof(*iph));
flush += ntohs(iph->payload_len) != skb->len;
rcu_read_lock();
proto = ipv6_gso_pull_exthdrs(skb, iph->nexthdr);
IPV6_GRO_CB(skb)->proto = proto;
ops = rcu_dereference(inet6_protos[proto]);
if (!ops || !ops->gro_receive)
goto out_unlock;
flush--;
skb_reset_transport_header(skb);
nlen = skb_network_header_len(skb);
for (p = *head; p; p = p->next) {
struct ipv6hdr *iph2;
if (!NAPI_GRO_CB(p)->same_flow)
continue;
iph2 = ipv6_hdr(p);
/* All fields must match except length. */
if (nlen != skb_network_header_len(p) ||
memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
memcmp(&iph->nexthdr, &iph2->nexthdr,
nlen - offsetof(struct ipv6hdr, nexthdr))) {
NAPI_GRO_CB(p)->same_flow = 0;
continue;
}
NAPI_GRO_CB(p)->flush |= flush;
}
NAPI_GRO_CB(skb)->flush |= flush;
pp = ops->gro_receive(head, skb);
out_unlock:
rcu_read_unlock();
out:
NAPI_GRO_CB(skb)->flush |= flush;
return pp;
}
static int ipv6_gro_complete(struct sk_buff *skb)
{
struct inet6_protocol *ops;
struct ipv6hdr *iph = ipv6_hdr(skb);
int err = -ENOSYS;
iph->payload_len = htons(skb->len - skb_network_offset(skb) -
sizeof(*iph));
rcu_read_lock();
ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
if (WARN_ON(!ops || !ops->gro_complete))
goto out_unlock;
err = ops->gro_complete(skb);
out_unlock:
rcu_read_unlock();
return err;
}
static struct packet_type ipv6_packet_type = {
.type = __constant_htons(ETH_P_IPV6),
.func = ipv6_rcv,
.gso_send_check = ipv6_gso_send_check,
.gso_segment = ipv6_gso_segment,
.gro_receive = ipv6_gro_receive,
.gro_complete = ipv6_gro_complete,
};
static int __init ipv6_packet_init(void)