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tunnels: Remove encapsulation offloads on decap. 

If a packet is either locally encapsulated or processed through GRO
it is marked with the offloads that it requires. However, when it is
decapsulated these tunnel offload indications are not removed. This
means that if we receive an encapsulated TCP packet, aggregate it with
GRO, decapsulate, and retransmit the resulting frame on a NIC that does
not support encapsulation, we won't be able to take advantage of hardware
offloads even though it is just a simple TCP packet at this point.

This fixes the problem by stripping off encapsulation offload indications
when packets are decapsulated.

The performance impacts of this bug are significant. In a test where a
Geneve encapsulated TCP stream is sent to a hypervisor, GRO'ed, decapsulated,
and bridged to a VM performance is improved by 60% (5Gbps->8Gbps) as a
result of avoiding unnecessary segmentation at the VM tap interface.

Reported-by: Ramu Ramamurthy <sramamur@linux.vnet.ibm.com>
Fixes: 68c33163 ("v4 GRE: Add TCP segmentation offload for GRE")
Signed-off-by: Jesse Gross <jesse@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesse Gross 2016-03-19 09:32:02 -07:00 committed by David S. Miller
parent fac8e0f579
commit a09a4c8dd1
4 changed files with 33 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
include/net/ip_tunnels.h
View File

@ -305,6 +305,22 @@ struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
static inline int iptunnel_pull_offloads(struct sk_buff *skb)
{
if (skb_is_gso(skb)) {
int err;
err = skb_unclone(skb, GFP_ATOMIC);
if (unlikely(err))
return err;
skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >>
NETIF_F_GSO_SHIFT);
}
skb->encapsulation = 0;
return 0;
}
static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
{
if (pkt_len > 0) {

13
net/ipv4/fou.c
View File

@ -48,7 +48,7 @@ static inline struct fou *fou_from_sock(struct sock *sk)
return sk->sk_user_data;
}
static void fou_recv_pull(struct sk_buff *skb, size_t len)
static int fou_recv_pull(struct sk_buff *skb, size_t len)
{
struct iphdr *iph = ip_hdr(skb);
@ -59,6 +59,7 @@ static void fou_recv_pull(struct sk_buff *skb, size_t len)
__skb_pull(skb, len);
skb_postpull_rcsum(skb, udp_hdr(skb), len);
skb_reset_transport_header(skb);
return iptunnel_pull_offloads(skb);
}
static int fou_udp_recv(struct sock *sk, struct sk_buff *skb)
@ -68,9 +69,14 @@ static int fou_udp_recv(struct sock *sk, struct sk_buff *skb)
if (!fou)
return 1;
fou_recv_pull(skb, sizeof(struct udphdr));
if (fou_recv_pull(skb, sizeof(struct udphdr)))
goto drop;
return -fou->protocol;
drop:
kfree_skb(skb);
return 0;
}
static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr,
@ -170,6 +176,9 @@ static int gue_udp_recv(struct sock *sk, struct sk_buff *skb)
__skb_pull(skb, sizeof(struct udphdr) + hdrlen);
skb_reset_transport_header(skb);
if (iptunnel_pull_offloads(skb))
goto drop;
return -guehdr->proto_ctype;
drop:

3
net/ipv4/ip_tunnel_core.c
View File

@ -114,7 +114,8 @@ int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto,
skb->vlan_tci = 0;
skb_set_queue_mapping(skb, 0);
skb_scrub_packet(skb, xnet);
return 0;
return iptunnel_pull_offloads(skb);
}
EXPORT_SYMBOL_GPL(iptunnel_pull_header);

6
net/ipv6/sit.c
View File

@ -681,14 +681,16 @@ static int ipip6_rcv(struct sk_buff *skb)
skb->mac_header = skb->network_header;
skb_reset_network_header(skb);
IPCB(skb)->flags = 0;
skb->protocol = htons(ETH_P_IPV6);
skb->dev = tunnel->dev;
if (packet_is_spoofed(skb, iph, tunnel)) {
tunnel->dev->stats.rx_errors++;
goto out;
}
__skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6),
!net_eq(tunnel->net, dev_net(tunnel->dev))))
goto out;
err = IP_ECN_decapsulate(iph, skb);
if (unlikely(err)) {