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| author | Jesse Gross <jesse@kernel.org> | 2016-03-19 09:32:02 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-31 04:13:59 -0600 |
| commit | 9f9818f8c1cf44055634297247620be4755e7af2 (patch) | |
| tree | 808aede98736a4ba87b8c6d8750117e9d1b6086a /include/net | |
| parent | 5699b3431e0b14736867484b8669ead2d40f575e (diff) | |
| download | talos-op-linux-9f9818f8c1cf44055634297247620be4755e7af2.tar.gz talos-op-linux-9f9818f8c1cf44055634297247620be4755e7af2.zip | |
tunnels: Remove encapsulation offloads on decap.
commit a09a4c8dd1ec7f830e1fb9e59eb72bddc965d168 upstream.
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>
(backported from commit a09a4c8dd1ec7f830e1fb9e59eb72bddc965d168)
[adapt iptunnel_pull_header arguments, avoid 7f290c9]
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Juerg Haefliger <juerg.haefliger@hpe.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/ip_tunnels.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h index af40bc586a1b..86a7bdd61d1a 100644 --- a/include/net/ip_tunnels.h +++ b/include/net/ip_tunnels.h @@ -283,6 +283,22 @@ struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum, 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(int err, struct net_device_stats *err_stats, struct pcpu_sw_netstats __percpu *stats) |
