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
tb_tunnel_is_pci(const struct tb_tunnel * tunnel)62 static inline bool tb_tunnel_is_pci(const struct tb_tunnel *tunnel)
63 {
64 return tunnel->type == TB_TUNNEL_PCI;
65 }
66
tb_tunnel_is_dp(const struct tb_tunnel * tunnel)67 static inline bool tb_tunnel_is_dp(const struct tb_tunnel *tunnel)
68 {
69 return tunnel->type == TB_TUNNEL_DP;
70 }
71
tb_tunnel_is_dma(const struct tb_tunnel * tunnel)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
79