From: Vinicius Costa Gomes <[email protected]> Date: Fri, 28 Sep 2018 17:59:43 -0700
> This traffic scheduler allows traffic classes states (transmission > allowed/not allowed, in the simplest case) to be scheduled, according > to a pre-generated time sequence. This is the basis of the IEEE > 802.1Qbv specification. > > Example configuration: > > tc qdisc replace dev enp3s0 parent root handle 100 taprio \ > num_tc 3 \ > map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 \ > queues 1@0 1@1 2@2 \ > base-time 1528743495910289987 \ > sched-entry S 01 300000 \ > sched-entry S 02 300000 \ > sched-entry S 04 300000 \ > clockid CLOCK_TAI > > The configuration format is similar to mqprio. The main difference is > the presence of a schedule, built by multiple "sched-entry" > definitions, each entry has the following format: > > sched-entry <CMD> <GATE MASK> <INTERVAL> > > The only supported <CMD> is "S", which means "SetGateStates", > following the IEEE 802.1Qbv-2015 definition (Table 8-6). <GATE MASK> > is a bitmask where each bit is a associated with a traffic class, so > bit 0 (the least significant bit) being "on" means that traffic class > 0 is "active" for that schedule entry. <INTERVAL> is a time duration > in nanoseconds that specifies for how long that state defined by <CMD> > and <GATE MASK> should be held before moving to the next entry. > > This schedule is circular, that is, after the last entry is executed > it starts from the first one, indefinitely. > > The other parameters can be defined as follows: > > - base-time: specifies the instant when the schedule starts, if > 'base-time' is a time in the past, the schedule will start at > > base-time + (N * cycle-time) > > where N is the smallest integer so the resulting time is greater > than "now", and "cycle-time" is the sum of all the intervals of the > entries in the schedule; > > - clockid: specifies the reference clock to be used; > > The parameters should be similar to what the IEEE 802.1Q family of > specification defines. > > Signed-off-by: Vinicius Costa Gomes <[email protected]> Applied.
