From: Petr Machata <petrm@xxxxxxxxxxxx> Date: Wed, 01 Aug 2018 00:35:53 +0200 > After IPv4 packets are forwarded, the priority of the corresponding SKB > is updated according to the TOS field of IPv4 header. This overrides any > prioritization done earlier by e.g. an skbedit action or ingress-qos-map > defined at a vlan device. > > Such overriding may not always be desirable. Even if the packet ends up > being routed, which implies this is an L3 network node, an administrator > may wish to preserve whatever prioritization was done earlier on in the > pipeline. > > Therefore this patch set introduces a sysctl that controls this > behavior, net.ipv4.ip_forward_update_priority. It's value is 1 by > default to preserve the current behavior. > > All of the above is implemented in patch #1. > > Value changes prompt a new NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE > notification, so that the drivers can hook up whatever logic may depend > on this value. That is implemented in patch #2. > > In patches #3 and #4, mlxsw is adapted to recognize the sysctl. On > initialization, the RGCR register that handles router configuration is > set in accordance with the sysctl. The new notification is listened to > and RGCR is reconfigured as necessary. > > In patches #5 to #7, a selftest is added to verify that mlxsw reflects > the sysctl value as necessary. The test is expressed in terms of the > recently-introduced ieee_setapp support, and works by observing how DSCP > value gets rewritten depending on packet priority. For this reason, the > test is added to the subdirectory drivers/net/mlxsw. Even though it's > not particularly specific to mlxsw, it's not suitable for running on > soft devices (which don't support the ieee_setapp et.al.). ... Series applied, thank you. -- To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
