From aac4daa8941ea6566563ac001e9e5d4e54a674e2 Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Wed, 28 Sep 2022 12:51:57 +0300 Subject: net/sched: query offload capabilities through ndo_setup_tc() When adding optional new features to Qdisc offloads, existing drivers must reject the new configuration until they are coded up to act on it. Since modifying all drivers in lockstep with the changes in the Qdisc can create problems of its own, it would be nice if there existed an automatic opt-in mechanism for offloading optional features. Jakub proposes that we multiplex one more kind of call through ndo_setup_tc(): one where the driver populates a Qdisc-specific capability structure. First user will be taprio in further changes. Here we are introducing the definitions for the base functionality. Link: https://patchwork.kernel.org/project/netdevbpf/patch/20220923163310.3192733-3-vladimir.oltean@nxp.com/ Suggested-by: Jakub Kicinski Co-developed-by: Jakub Kicinski Signed-off-by: Vladimir Oltean Signed-off-by: Jakub Kicinski --- include/linux/netdevice.h | 1 + include/net/pkt_sched.h | 5 +++++ include/net/sch_generic.h | 3 +++ 3 files changed, 9 insertions(+) (limited to 'include') diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 64c3a5864969..eddf8ee270e7 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -940,6 +940,7 @@ struct net_device_path_ctx { }; enum tc_setup_type { + TC_QUERY_CAPS, TC_SETUP_QDISC_MQPRIO, TC_SETUP_CLSU32, TC_SETUP_CLSFLOWER, diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h index 2ff80cd04c5c..34600292fdfb 100644 --- a/include/net/pkt_sched.h +++ b/include/net/pkt_sched.h @@ -141,6 +141,11 @@ static inline struct net *qdisc_net(struct Qdisc *q) return dev_net(q->dev_queue->dev); } +struct tc_query_caps_base { + enum tc_setup_type type; + void *caps; +}; + struct tc_cbs_qopt_offload { u8 enable; s32 queue; diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index 32819299937d..d5517719af4e 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -677,6 +677,9 @@ qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, { } #endif +void qdisc_offload_query_caps(struct net_device *dev, + enum tc_setup_type type, + void *caps, size_t caps_len); struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, const struct Qdisc_ops *ops, struct netlink_ext_ack *extack); -- cgit v1.2.3