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Disabled the use of flowid for lagg by default

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Disabled the use of RSS hash from the network card aka flowid for
lagg(4) interfaces by default as it's currently incompatible with
the lacp and loadbalance protocols.

The incompatibility is due to the fact that the flowid isn't know
for the first packet of a new outbound stream which can result in
the hash calculation method changing and hence a stream being
incorrectly split across multiple interfaces during normal
operation.

This can be re-enabled by setting the following in loader.conf:
net.link.lagg.default_use_flowid="1"

Discussed with: kmacy
Sponsored by:	Multiplay
This commit is contained in:
Steven Hartland 2018-01-04 20:05:47 +00:00
parent 07a0a243ec
commit fd3bb7aa46
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=327559
2 changed files with 9 additions and 1 deletions
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8
UPDATING
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@ -51,6 +51,14 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 12.x IS SLOW:
****************************** SPECIAL WARNING: ******************************
20180104:
The use of RSS hash from the network card aka flowid has been
disabled by default for lagg(4) as it's currently incompatible with
the lacp and loadbalance protocols.
This can be re-enabled by setting the following in loader.conf:
net.link.lagg.default_use_flowid="1"
20180102:
The SW_WATCHDOG option is no longer necessary to enable the
hardclock-based software watchdog if no hardware watchdog is

2
sys/net/if_lagg.c
View file

@ -244,7 +244,7 @@ SYSCTL_INT(_net_link_lagg, OID_AUTO, failover_rx_all, CTLFLAG_RW | CTLFLAG_VNET,
"Accept input from any interface in a failover lagg");
/* Default value for using flowid */
static VNET_DEFINE(int, def_use_flowid) = 1;
static VNET_DEFINE(int, def_use_flowid) = 0;
#define V_def_use_flowid VNET(def_use_flowid)
SYSCTL_INT(_net_link_lagg, OID_AUTO, default_use_flowid, CTLFLAG_RWTUN,
&VNET_NAME(def_use_flowid), 0,