diff options
| author | Kurt Kanzenbach <kurt@linutronix.de> | 2021-01-23 11:56:33 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-01-23 21:25:16 -0800 |
| commit | 24dfc6eb39b26fc3a5a17a606e868b74f6202ee4 (patch) | |
| tree | 8dd1c8b1ad1d91c1f9ba27fba55b49114310d1bd /drivers/net/dsa/hirschmann/hellcreek.h | |
| parent | b80b5dbf118fbb97d67e9e41e68941efeb0457c6 (diff) | |
net: dsa: hellcreek: Add TAPRIO offloading support
The switch has support for the 802.1Qbv Time Aware Shaper (TAS). Traffic
schedules may be configured individually on each front port. Each port has eight
egress queues. The traffic is mapped to a traffic class respectively via the PCP
field of a VLAN tagged frame.
The TAPRIO Qdisc already implements that. Therefore, this interface can simply
be reused. Add .port_setup_tc() accordingly.
The activation of a schedule on a port is split into two parts:
* Programming the necessary gate control list (GCL)
* Setup delayed work for starting the schedule
The hardware supports starting a schedule up to eight seconds in the future. The
TAPRIO interface provides an absolute base time. Therefore, periodic delayed
work is leveraged to check whether a schedule may be started or not.
Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/dsa/hirschmann/hellcreek.h')
| -rw-r--r-- | drivers/net/dsa/hirschmann/hellcreek.h | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/net/dsa/hirschmann/hellcreek.h b/drivers/net/dsa/hirschmann/hellcreek.h index e81781ebc31c..854639f87247 100644 --- a/drivers/net/dsa/hirschmann/hellcreek.h +++ b/drivers/net/dsa/hirschmann/hellcreek.h @@ -3,7 +3,7 @@ * DSA driver for: * Hirschmann Hellcreek TSN switch. * - * Copyright (C) 2019,2020 Linutronix GmbH + * Copyright (C) 2019-2021 Linutronix GmbH * Author Kurt Kanzenbach <kurt@linutronix.de> */ @@ -21,6 +21,7 @@ #include <linux/ptp_clock_kernel.h> #include <linux/timecounter.h> #include <net/dsa.h> +#include <net/pkt_sched.h> /* Ports: * - 0: CPU @@ -246,6 +247,10 @@ struct hellcreek_port { /* Per-port timestamping resources */ struct hellcreek_port_hwtstamp port_hwtstamp; + + /* Per-port Qbv schedule information */ + struct tc_taprio_qopt_offload *current_schedule; + struct delayed_work schedule_work; }; struct hellcreek_fdb_entry { @@ -283,4 +288,14 @@ struct hellcreek { size_t fdb_entries; }; +/* A Qbv schedule can only started up to 8 seconds in the future. If the delta + * between the base time and the current ptp time is larger than 8 seconds, then + * use periodic work to check for the schedule to be started. The delayed work + * cannot be armed directly to $base_time - 8 + X, because for large deltas the + * PTP frequency matters. + */ +#define HELLCREEK_SCHEDULE_PERIOD (2 * HZ) +#define dw_to_hellcreek_port(dw) \ + container_of(dw, struct hellcreek_port, schedule_work) + #endif /* _HELLCREEK_H_ */ |