diff options
| author | Lance Richardson <lrichard@redhat.com> | 2016-11-02 16:36:17 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-11-03 16:10:26 -0400 |
| commit | 9ee6c5dc816aa8256257f2cd4008a9291ec7e985 (patch) | |
| tree | b52ae6938861f8a9ce99c46db958b28a7ac321fd /include/net/ip.h | |
| parent | da96786e26c3ae47316db2b92046b11268c4379c (diff) | |
| download | lwn-9ee6c5dc816aa8256257f2cd4008a9291ec7e985.tar.gz lwn-9ee6c5dc816aa8256257f2cd4008a9291ec7e985.zip | |
ipv4: allow local fragmentation in ip_finish_output_gso()
Some configurations (e.g. geneve interface with default
MTU of 1500 over an ethernet interface with 1500 MTU) result
in the transmission of packets that exceed the configured MTU.
While this should be considered to be a "bad" configuration,
it is still allowed and should not result in the sending
of packets that exceed the configured MTU.
Fix by dropping the assumption in ip_finish_output_gso() that
locally originated gso packets will never need fragmentation.
Basic testing using iperf (observing CPU usage and bandwidth)
have shown no measurable performance impact for traffic not
requiring fragmentation.
Fixes: c7ba65d7b649 ("net: ip: push gso skb forwarding handling down the stack")
Reported-by: Jan Tluka <jtluka@redhat.com>
Signed-off-by: Lance Richardson <lrichard@redhat.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/ip.h')
| -rw-r--r-- | include/net/ip.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/include/net/ip.h b/include/net/ip.h index 5413883ac47f..d3a107850a41 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -47,8 +47,7 @@ struct inet_skb_parm { #define IPSKB_REROUTED BIT(4) #define IPSKB_DOREDIRECT BIT(5) #define IPSKB_FRAG_PMTU BIT(6) -#define IPSKB_FRAG_SEGS BIT(7) -#define IPSKB_L3SLAVE BIT(8) +#define IPSKB_L3SLAVE BIT(7) u16 frag_max_size; }; |