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ipvs: add pmtu_disc option to disable IP DF for TUN packets

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Disabling PMTU discovery can increase the output packet
rate but some users have enough resources and prefer to fragment
than to drop traffic. By default, we copy the DF bit but if
pmtu_disc is disabled we do not send FRAG_NEEDED messages anymore.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
This commit is contained in:
Julian Anastasov
2012-07-20 11:59:53 +03:00
committed by Simon Horman
parent f2edb9f770
commit 3654e61137
3 changed files with 22 additions and 3 deletions
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11
include/net/ip_vs.h
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@@ -888,6 +888,7 @@ struct netns_ipvs {
unsigned int sysctl_sync_refresh_period;
int sysctl_sync_retries;
int sysctl_nat_icmp_send;
int sysctl_pmtu_disc;
/* ip_vs_lblc */
int sysctl_lblc_expiration;
@@ -974,6 +975,11 @@ static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
return ipvs->sysctl_sync_sock_size;
}
static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_pmtu_disc;
}
#else
static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
@@ -1016,6 +1022,11 @@ static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
return 0;
}
static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
{
return 1;
}
#endif
/*