2 * drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
3 * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
4 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
5 * Copyright (c) 2016 Ido Schimmel <idosch@mellanox.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the names of the copyright holders nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
19 * Alternatively, this software may be distributed under the terms of the
20 * GNU General Public License ("GPL") version 2 as published by the Free
21 * Software Foundation.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
24 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
36 #include <linux/kernel.h>
37 #include <linux/types.h>
38 #include <linux/rhashtable.h>
39 #include <linux/bitops.h>
40 #include <linux/in6.h>
47 mlxsw_sp_prefix_usage_set(struct mlxsw_sp_prefix_usage *prefix_usage,
48 unsigned char prefix_len)
50 set_bit(prefix_len, prefix_usage->b);
54 mlxsw_sp_prefix_usage_clear(struct mlxsw_sp_prefix_usage *prefix_usage,
55 unsigned char prefix_len)
57 clear_bit(prefix_len, prefix_usage->b);
60 struct mlxsw_sp_fib_key {
61 unsigned char addr[sizeof(struct in6_addr)];
62 unsigned char prefix_len;
65 struct mlxsw_sp_fib_entry {
66 struct rhash_head ht_node;
67 struct mlxsw_sp_fib_key key;
72 unsigned long prefix_ref_count[MLXSW_SP_PREFIX_COUNT];
73 struct mlxsw_sp_prefix_usage prefix_usage;
76 static const struct rhashtable_params mlxsw_sp_fib_ht_params = {
77 .key_offset = offsetof(struct mlxsw_sp_fib_entry, key),
78 .head_offset = offsetof(struct mlxsw_sp_fib_entry, ht_node),
79 .key_len = sizeof(struct mlxsw_sp_fib_key),
80 .automatic_shrinking = true,
83 static int mlxsw_sp_fib_entry_insert(struct mlxsw_sp_fib *fib,
84 struct mlxsw_sp_fib_entry *fib_entry)
86 unsigned char prefix_len = fib_entry->key.prefix_len;
89 err = rhashtable_insert_fast(&fib->ht, &fib_entry->ht_node,
90 mlxsw_sp_fib_ht_params);
93 if (fib->prefix_ref_count[prefix_len]++ == 0)
94 mlxsw_sp_prefix_usage_set(&fib->prefix_usage, prefix_len);
98 static void mlxsw_sp_fib_entry_remove(struct mlxsw_sp_fib *fib,
99 struct mlxsw_sp_fib_entry *fib_entry)
101 unsigned char prefix_len = fib_entry->key.prefix_len;
103 if (--fib->prefix_ref_count[prefix_len] == 0)
104 mlxsw_sp_prefix_usage_clear(&fib->prefix_usage, prefix_len);
105 rhashtable_remove_fast(&fib->ht, &fib_entry->ht_node,
106 mlxsw_sp_fib_ht_params);
109 static struct mlxsw_sp_fib_entry *
110 mlxsw_sp_fib_entry_create(struct mlxsw_sp_fib *fib, const void *addr,
111 size_t addr_len, unsigned char prefix_len)
113 struct mlxsw_sp_fib_entry *fib_entry;
115 fib_entry = kzalloc(sizeof(*fib_entry), GFP_KERNEL);
118 memcpy(fib_entry->key.addr, addr, addr_len);
119 fib_entry->key.prefix_len = prefix_len;
123 static void mlxsw_sp_fib_entry_destroy(struct mlxsw_sp_fib_entry *fib_entry)
128 static struct mlxsw_sp_fib_entry *
129 mlxsw_sp_fib_entry_lookup(struct mlxsw_sp_fib *fib, const void *addr,
130 size_t addr_len, unsigned char prefix_len)
132 struct mlxsw_sp_fib_key key = {{ 0 } };
134 memcpy(key.addr, addr, addr_len);
135 key.prefix_len = prefix_len;
136 return rhashtable_lookup_fast(&fib->ht, &key, mlxsw_sp_fib_ht_params);
139 static struct mlxsw_sp_fib *mlxsw_sp_fib_create(void)
141 struct mlxsw_sp_fib *fib;
144 fib = kzalloc(sizeof(*fib), GFP_KERNEL);
146 return ERR_PTR(-ENOMEM);
147 err = rhashtable_init(&fib->ht, &mlxsw_sp_fib_ht_params);
149 goto err_rhashtable_init;
157 static void mlxsw_sp_fib_destroy(struct mlxsw_sp_fib *fib)
159 rhashtable_destroy(&fib->ht);
163 static int __mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp)
165 char rgcr_pl[MLXSW_REG_RGCR_LEN];
167 mlxsw_reg_rgcr_pack(rgcr_pl, true);
168 mlxsw_reg_rgcr_max_router_interfaces_set(rgcr_pl, MLXSW_SP_RIF_MAX);
169 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rgcr), rgcr_pl);
172 static void __mlxsw_sp_router_fini(struct mlxsw_sp *mlxsw_sp)
174 char rgcr_pl[MLXSW_REG_RGCR_LEN];
176 mlxsw_reg_rgcr_pack(rgcr_pl, false);
177 mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rgcr), rgcr_pl);
180 int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp)
182 return __mlxsw_sp_router_init(mlxsw_sp);
185 void mlxsw_sp_router_fini(struct mlxsw_sp *mlxsw_sp)
187 __mlxsw_sp_router_fini(mlxsw_sp);