drivers/thunderbolt/tunnel.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Thunderbolt driver - Tunneling support
   4  *
   5  * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
   6  * Copyright (C) 2019, Intel Corporation
   7  */
   8
   9 #ifndef TB_TUNNEL_H_
  10 #define TB_TUNNEL_H_
  11
  12 #include "tb.h"
  13
  14 enum tb_tunnel_type {
  15         TB_TUNNEL_PCI,
  16         TB_TUNNEL_DP,
  17         TB_TUNNEL_DMA,
  18 };
  19
  20 /**
  21  * struct tb_tunnel - Tunnel between two ports
  22  * @tb: Pointer to the domain
  23  * @src_port: Source port of the tunnel
  24  * @dst_port: Destination port of the tunnel. For discovered incomplete
  25  *            tunnels may be %NULL or null adapter port instead.
  26  * @paths: All paths required by the tunnel
  27  * @npaths: Number of paths in @paths
  28  * @init: Optional tunnel specific initialization
  29  * @activate: Optional tunnel specific activation/deactivation
  30  * @list: Tunnels are linked using this field
  31  * @type: Type of the tunnel
  32  */
  33 struct tb_tunnel {
  34         struct tb *tb;
  35         struct tb_port *src_port;
  36         struct tb_port *dst_port;
  37         struct tb_path **paths;
  38         size_t npaths;
  39         int (*init)(struct tb_tunnel *tunnel);
  40         int (*activate)(struct tb_tunnel *tunnel, bool activate);
  41         struct list_head list;
  42         enum tb_tunnel_type type;
  43 };
  44
  45 struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down);
  46 struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
  47                                       struct tb_port *down);
  48 struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in);
  49 struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
  50                                      struct tb_port *out);
  51 struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
  52                                       struct tb_port *dst, int transmit_ring,
  53                                       int transmit_path, int receive_ring,
  54                                       int receive_path);
  55
  56 void tb_tunnel_free(struct tb_tunnel *tunnel);
  57 int tb_tunnel_activate(struct tb_tunnel *tunnel);
  58 int tb_tunnel_restart(struct tb_tunnel *tunnel);
  59 void tb_tunnel_deactivate(struct tb_tunnel *tunnel);
  60 bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel);
  61
  62 static inline bool tb_tunnel_is_pci(const struct tb_tunnel *tunnel)
  63 {
  64         return tunnel->type == TB_TUNNEL_PCI;
  65 }
  66
  67 static inline bool tb_tunnel_is_dp(const struct tb_tunnel *tunnel)
  68 {
  69         return tunnel->type == TB_TUNNEL_DP;
  70 }
  71
  72 static inline bool tb_tunnel_is_dma(const struct tb_tunnel *tunnel)
  73 {
  74         return tunnel->type == TB_TUNNEL_DMA;
  75 }
  76
  77 #endif
  78