1/*
2 * Copyright (c) 2016, Mellanox Technologies, Ltd.  All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses.  You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 *     Redistribution and use in source and binary forms, with or
11 *     without modification, are permitted provided that the following
12 *     conditions are met:
13 *
14 *      - Redistributions of source code must retain the above
15 *        copyright notice, this list of conditions and the following
16 *        disclaimer.
17 *
18 *      - Redistributions in binary form must reproduce the above
19 *        copyright notice, this list of conditions and the following
20 *        disclaimer in the documentation and/or other materials
21 *        provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33#include <linux/kernel.h>
34#include <linux/refcount.h>
35#include <linux/mlx5/driver.h>
36#include <net/vxlan.h>
37#include "mlx5_core.h"
38#include "vxlan.h"
39
40struct mlx5_vxlan {
41	struct mlx5_core_dev		*mdev;
42	/* max_num_ports is usually 4, 16 buckets is more than enough */
43	DECLARE_HASHTABLE(htable, 4);
44	struct mutex                    sync_lock; /* sync add/del port HW operations */
45};
46
47struct mlx5_vxlan_port {
48	struct hlist_node hlist;
49	u16 udp_port;
50};
51
52static int mlx5_vxlan_core_add_port_cmd(struct mlx5_core_dev *mdev, u16 port)
53{
54	u32 in[MLX5_ST_SZ_DW(add_vxlan_udp_dport_in)] = {};
55
56	MLX5_SET(add_vxlan_udp_dport_in, in, opcode,
57		 MLX5_CMD_OP_ADD_VXLAN_UDP_DPORT);
58	MLX5_SET(add_vxlan_udp_dport_in, in, vxlan_udp_port, port);
59	return mlx5_cmd_exec_in(mdev, add_vxlan_udp_dport, in);
60}
61
62static int mlx5_vxlan_core_del_port_cmd(struct mlx5_core_dev *mdev, u16 port)
63{
64	u32 in[MLX5_ST_SZ_DW(delete_vxlan_udp_dport_in)] = {};
65
66	MLX5_SET(delete_vxlan_udp_dport_in, in, opcode,
67		 MLX5_CMD_OP_DELETE_VXLAN_UDP_DPORT);
68	MLX5_SET(delete_vxlan_udp_dport_in, in, vxlan_udp_port, port);
69	return mlx5_cmd_exec_in(mdev, delete_vxlan_udp_dport, in);
70}
71
72bool mlx5_vxlan_lookup_port(struct mlx5_vxlan *vxlan, u16 port)
73{
74	struct mlx5_vxlan_port *vxlanp;
75	bool found = false;
76
77	if (!mlx5_vxlan_allowed(vxlan))
78		return NULL;
79
80	rcu_read_lock();
81	hash_for_each_possible_rcu(vxlan->htable, vxlanp, hlist, port)
82		if (vxlanp->udp_port == port) {
83			found = true;
84			break;
85		}
86	rcu_read_unlock();
87
88	return found;
89}
90
91static struct mlx5_vxlan_port *vxlan_lookup_port(struct mlx5_vxlan *vxlan, u16 port)
92{
93	struct mlx5_vxlan_port *vxlanp;
94
95	hash_for_each_possible(vxlan->htable, vxlanp, hlist, port)
96		if (vxlanp->udp_port == port)
97			return vxlanp;
98	return NULL;
99}
100
101int mlx5_vxlan_add_port(struct mlx5_vxlan *vxlan, u16 port)
102{
103	struct mlx5_vxlan_port *vxlanp;
104	int ret;
105
106	vxlanp = kzalloc(sizeof(*vxlanp), GFP_KERNEL);
107	if (!vxlanp)
108		return -ENOMEM;
109	vxlanp->udp_port = port;
110
111	ret = mlx5_vxlan_core_add_port_cmd(vxlan->mdev, port);
112	if (ret) {
113		kfree(vxlanp);
114		return ret;
115	}
116
117	mutex_lock(&vxlan->sync_lock);
118	hash_add_rcu(vxlan->htable, &vxlanp->hlist, port);
119	mutex_unlock(&vxlan->sync_lock);
120
121	return 0;
122}
123
124int mlx5_vxlan_del_port(struct mlx5_vxlan *vxlan, u16 port)
125{
126	struct mlx5_vxlan_port *vxlanp;
127	int ret = 0;
128
129	mutex_lock(&vxlan->sync_lock);
130
131	vxlanp = vxlan_lookup_port(vxlan, port);
132	if (WARN_ON(!vxlanp)) {
133		ret = -ENOENT;
134		goto out_unlock;
135	}
136
137	hash_del_rcu(&vxlanp->hlist);
138	synchronize_rcu();
139	mlx5_vxlan_core_del_port_cmd(vxlan->mdev, port);
140	kfree(vxlanp);
141
142out_unlock:
143	mutex_unlock(&vxlan->sync_lock);
144	return ret;
145}
146
147struct mlx5_vxlan *mlx5_vxlan_create(struct mlx5_core_dev *mdev)
148{
149	struct mlx5_vxlan *vxlan;
150
151	if (!MLX5_CAP_ETH(mdev, tunnel_stateless_vxlan) || !mlx5_core_is_pf(mdev))
152		return ERR_PTR(-ENOTSUPP);
153
154	vxlan = kzalloc(sizeof(*vxlan), GFP_KERNEL);
155	if (!vxlan)
156		return ERR_PTR(-ENOMEM);
157
158	vxlan->mdev = mdev;
159	mutex_init(&vxlan->sync_lock);
160	hash_init(vxlan->htable);
161
162	/* Hardware adds 4789 (IANA_VXLAN_UDP_PORT) by default */
163	mlx5_vxlan_add_port(vxlan, IANA_VXLAN_UDP_PORT);
164
165	return vxlan;
166}
167
168void mlx5_vxlan_destroy(struct mlx5_vxlan *vxlan)
169{
170	if (!mlx5_vxlan_allowed(vxlan))
171		return;
172
173	mlx5_vxlan_del_port(vxlan, IANA_VXLAN_UDP_PORT);
174	WARN_ON(!hash_empty(vxlan->htable));
175
176	kfree(vxlan);
177}
178
179void mlx5_vxlan_reset_to_default(struct mlx5_vxlan *vxlan)
180{
181	struct mlx5_vxlan_port *vxlanp;
182	struct hlist_node *tmp;
183	int bkt;
184
185	if (!mlx5_vxlan_allowed(vxlan))
186		return;
187
188	hash_for_each_safe(vxlan->htable, bkt, tmp, vxlanp, hlist) {
189		/* Don't delete default UDP port added by the HW.
190		 * Remove only user configured ports
191		 */
192		if (vxlanp->udp_port == IANA_VXLAN_UDP_PORT)
193			continue;
194		mlx5_vxlan_del_port(vxlan, vxlanp->udp_port);
195	}
196}
197