From 9c66d15646760eb8982242b4531c4d4fd36118fd Mon Sep 17 00:00:00 2001 From: Vinicius Costa Gomes Date: Sun, 15 Sep 2019 04:59:58 +0300 Subject: taprio: Add support for hardware offloading This allows taprio to offload the schedule enforcement to capable network cards, resulting in more precise windows and less CPU usage. The gate mask acts on traffic classes (groups of queues of same priority), as specified in IEEE 802.1Q-2018, and following the existing taprio and mqprio semantics. It is up to the driver to perform conversion between tc and individual netdev queues if for some reason it needs to make that distinction. Full offload is requested from the network interface by specifying "flags 2" in the tc qdisc creation command, which in turn corresponds to the TCA_TAPRIO_ATTR_FLAG_FULL_OFFLOAD bit. The important detail here is the clockid which is implicitly /dev/ptpN for full offload, and hence not configurable. A reference counting API is added to support the use case where Ethernet drivers need to keep the taprio offload structure locally (i.e. they are a multi-port switch driver, and configuring a port depends on the settings of other ports as well). The refcount_t variable is kept in a private structure (__tc_taprio_qopt_offload) and not exposed to drivers. In the future, the private structure might also be expanded with a backpointer to taprio_sched *q, to implement the notification system described in the patch (of when admin became oper, or an error occurred, etc, so the offload can be monitored with 'tc qdisc show'). Signed-off-by: Vinicius Costa Gomes Signed-off-by: Voon Weifeng Signed-off-by: Vladimir Oltean Signed-off-by: David S. Miller --- include/net/pkt_sched.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'include/net/pkt_sched.h') diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h index a16fbe9a2a67..d1632979622e 100644 --- a/include/net/pkt_sched.h +++ b/include/net/pkt_sched.h @@ -161,4 +161,27 @@ struct tc_etf_qopt_offload { s32 queue; }; +struct tc_taprio_sched_entry { + u8 command; /* TC_TAPRIO_CMD_* */ + + /* The gate_mask in the offloading side refers to traffic classes */ + u32 gate_mask; + u32 interval; +}; + +struct tc_taprio_qopt_offload { + u8 enable; + ktime_t base_time; + u64 cycle_time; + u64 cycle_time_extension; + + size_t num_entries; + struct tc_taprio_sched_entry entries[0]; +}; + +/* Reference counting */ +struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload + *offload); +void taprio_offload_free(struct tc_taprio_qopt_offload *offload); + #endif -- cgit v1.2.3