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The USB4 Connection Manager guide provides detailed information how the USB4 router buffer (credit) allocation information should be used by the connection manager when it allocates buffers for different paths. This patch implements it for Linux. For USB 3.x and DisplayPort we use directly the router preferences. The rest of the buffer space is then used for PCIe and DMA (peer-to-peer, XDomain) traffic. DMA tunnels require at least one buffer and PCIe six, so if there is not enough buffers we fail the tunnel creation. For the legacy Thunderbolt 1-3 devices we use the existing hard-coded scheme except for DMA where we use the values suggested by the USB4 spec chapter 13. Co-developed-by: Gil Fine <gil.fine@intel.com> Signed-off-by: Gil Fine <gil.fine@intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
120 lines
4.1 KiB
C
120 lines
4.1 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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* @deinit: Optional tunnel specific de-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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* @release_unused_bandwidth: Release all unused bandwidth
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* @reclaim_available_bandwidth: Reclaim back available bandwidth
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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_up: Maximum upstream bandwidth (Mb/s) available for the tunnel.
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* Only set if the bandwidth needs to be limited.
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* @max_down: Maximum downstream bandwidth (Mb/s) available for the tunnel.
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* Only set if the bandwidth needs to be limited.
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* @allocated_up: Allocated upstream bandwidth (only for USB3)
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* @allocated_down: Allocated downstream bandwidth (only for USB3)
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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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void (*deinit)(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, int *consumed_up,
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int *consumed_down);
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int (*release_unused_bandwidth)(struct tb_tunnel *tunnel);
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void (*reclaim_available_bandwidth)(struct tb_tunnel *tunnel,
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int *available_up,
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int *available_down);
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struct list_head list;
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enum tb_tunnel_type type;
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int max_up;
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int max_down;
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int allocated_up;
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int allocated_down;
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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_up,
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int max_down);
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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_path,
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int transmit_ring, int receive_path,
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int receive_ring);
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bool tb_tunnel_match_dma(const struct tb_tunnel *tunnel, int transmit_path,
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int transmit_ring, int receive_path, int receive_ring);
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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, int max_up,
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int max_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_port_on_path(const struct tb_tunnel *tunnel,
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const struct tb_port *port);
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int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,
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int *consumed_down);
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int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel);
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void tb_tunnel_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
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int *available_up,
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int *available_down);
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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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