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USB4 added a capability to tunnel USB 3.x protocol over the USB4 fabric. USB4 device routers may include integrated SuperSpeed HUB or a function or both. USB tunneling follows PCIe so that the tunnel is created between the parent and the child router from USB3 downstream adapter port to USB3 upstream adapter port over a single USB4 link. This adds support for USB 3.x tunneling and also capability to discover existing USB 3.x tunnels (for example created by connection manager in boot firmware). Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com> Co-developed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Link: https://lore.kernel.org/r/20191217123345.31850-9-mika.westerberg@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
95 lines
3 KiB
C
95 lines
3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Thunderbolt driver - Tunneling support
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*
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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* Copyright (C) 2019, Intel Corporation
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*/
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#ifndef TB_TUNNEL_H_
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#define TB_TUNNEL_H_
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#include "tb.h"
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enum tb_tunnel_type {
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TB_TUNNEL_PCI,
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TB_TUNNEL_DP,
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TB_TUNNEL_DMA,
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TB_TUNNEL_USB3,
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};
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/**
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* struct tb_tunnel - Tunnel between two ports
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* @tb: Pointer to the domain
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* @src_port: Source port of the tunnel
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* @dst_port: Destination port of the tunnel. For discovered incomplete
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* tunnels may be %NULL or null adapter port instead.
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* @paths: All paths required by the tunnel
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* @npaths: Number of paths in @paths
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* @init: Optional tunnel specific initialization
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* @activate: Optional tunnel specific activation/deactivation
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* @consumed_bandwidth: Return how much bandwidth the tunnel consumes
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* @list: Tunnels are linked using this field
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* @type: Type of the tunnel
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* @max_bw: Maximum bandwidth (Mb/s) available for the tunnel (only for DP).
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* Only set if the bandwidth needs to be limited.
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*/
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struct tb_tunnel {
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struct tb *tb;
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struct tb_port *src_port;
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struct tb_port *dst_port;
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struct tb_path **paths;
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size_t npaths;
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int (*init)(struct tb_tunnel *tunnel);
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int (*activate)(struct tb_tunnel *tunnel, bool activate);
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int (*consumed_bandwidth)(struct tb_tunnel *tunnel);
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struct list_head list;
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enum tb_tunnel_type type;
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unsigned int max_bw;
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};
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struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down);
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struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
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struct tb_port *down);
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struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in);
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struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
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struct tb_port *out, int max_bw);
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struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
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struct tb_port *dst, int transmit_ring,
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int transmit_path, int receive_ring,
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int receive_path);
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struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down);
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struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up,
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struct tb_port *down);
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void tb_tunnel_free(struct tb_tunnel *tunnel);
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int tb_tunnel_activate(struct tb_tunnel *tunnel);
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int tb_tunnel_restart(struct tb_tunnel *tunnel);
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void tb_tunnel_deactivate(struct tb_tunnel *tunnel);
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bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel);
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bool tb_tunnel_switch_on_path(const struct tb_tunnel *tunnel,
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const struct tb_switch *sw);
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int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel);
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static inline bool tb_tunnel_is_pci(const struct tb_tunnel *tunnel)
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{
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return tunnel->type == TB_TUNNEL_PCI;
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}
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static inline bool tb_tunnel_is_dp(const struct tb_tunnel *tunnel)
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{
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return tunnel->type == TB_TUNNEL_DP;
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}
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static inline bool tb_tunnel_is_dma(const struct tb_tunnel *tunnel)
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{
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return tunnel->type == TB_TUNNEL_DMA;
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}
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static inline bool tb_tunnel_is_usb3(const struct tb_tunnel *tunnel)
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{
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return tunnel->type == TB_TUNNEL_USB3;
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}
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#endif
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