1 /*-
2 * Copyright (c) 2017, Mellanox Technologies. 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/etherdevice.h>
34 #include <dev/mlx5/driver.h>
35 #include <dev/mlx5/mlx5_core/mlx5_core.h>
36 #include <dev/mlx5/mlx5_lib/mlx5.h>
37
mlx5_init_reserved_gids(struct mlx5_core_dev * dev)38 void mlx5_init_reserved_gids(struct mlx5_core_dev *dev)
39 {
40 unsigned int tblsz = MLX5_CAP_ROCE(dev, roce_address_table_size);
41
42 ida_init(&dev->roce.reserved_gids.ida);
43 dev->roce.reserved_gids.start = tblsz;
44 dev->roce.reserved_gids.count = 0;
45 }
46
mlx5_cleanup_reserved_gids(struct mlx5_core_dev * dev)47 void mlx5_cleanup_reserved_gids(struct mlx5_core_dev *dev)
48 {
49 WARN_ON(!ida_is_empty(&dev->roce.reserved_gids.ida));
50 dev->roce.reserved_gids.start = 0;
51 dev->roce.reserved_gids.count = 0;
52 ida_destroy(&dev->roce.reserved_gids.ida);
53 }
54
mlx5_core_reserve_gids(struct mlx5_core_dev * dev,unsigned int count)55 int mlx5_core_reserve_gids(struct mlx5_core_dev *dev, unsigned int count)
56 {
57 if (test_bit(MLX5_INTERFACE_STATE_UP, &dev->intf_state)) {
58 mlx5_core_err(dev, "Cannot reserve GIDs when interfaces are up\n");
59 return -EPERM;
60 }
61 if (dev->roce.reserved_gids.start < count) {
62 mlx5_core_warn(dev, "GID table exhausted attempting to reserve %d more GIDs\n",
63 count);
64 return -ENOMEM;
65 }
66 if (dev->roce.reserved_gids.count + count > MLX5_MAX_RESERVED_GIDS) {
67 mlx5_core_warn(dev, "Unable to reserve %d more GIDs\n", count);
68 return -ENOMEM;
69 }
70
71 dev->roce.reserved_gids.start -= count;
72 dev->roce.reserved_gids.count += count;
73 mlx5_core_dbg(dev, "Reserved %u GIDs starting at %u\n",
74 dev->roce.reserved_gids.count,
75 dev->roce.reserved_gids.start);
76 return 0;
77 }
78
mlx5_core_unreserve_gids(struct mlx5_core_dev * dev,unsigned int count)79 void mlx5_core_unreserve_gids(struct mlx5_core_dev *dev, unsigned int count)
80 {
81 WARN(test_bit(MLX5_INTERFACE_STATE_UP, &dev->intf_state), "Unreserving GIDs when interfaces are up");
82 WARN(count > dev->roce.reserved_gids.count, "Unreserving %u GIDs when only %u reserved",
83 count, dev->roce.reserved_gids.count);
84
85 dev->roce.reserved_gids.start += count;
86 dev->roce.reserved_gids.count -= count;
87 mlx5_core_dbg(dev, "%u GIDs starting at %u left reserved\n",
88 dev->roce.reserved_gids.count,
89 dev->roce.reserved_gids.start);
90 }
91
mlx5_core_reserved_gid_alloc(struct mlx5_core_dev * dev,int * gid_index)92 int mlx5_core_reserved_gid_alloc(struct mlx5_core_dev *dev, int *gid_index)
93 {
94 int end = dev->roce.reserved_gids.start +
95 dev->roce.reserved_gids.count;
96 int index = 0;
97
98 index = ida_simple_get(&dev->roce.reserved_gids.ida,
99 dev->roce.reserved_gids.start, end,
100 GFP_KERNEL);
101 if (index < 0)
102 return index;
103
104 mlx5_core_dbg(dev, "Allocating reserved GID %u\n", index);
105 *gid_index = index;
106 return 0;
107 }
108
mlx5_core_reserved_gid_free(struct mlx5_core_dev * dev,int gid_index)109 void mlx5_core_reserved_gid_free(struct mlx5_core_dev *dev, int gid_index)
110 {
111 mlx5_core_dbg(dev, "Freeing reserved GID %u\n", gid_index);
112 ida_simple_remove(&dev->roce.reserved_gids.ida, gid_index);
113 }
114
mlx5_core_reserved_gids_count(struct mlx5_core_dev * dev)115 unsigned int mlx5_core_reserved_gids_count(struct mlx5_core_dev *dev)
116 {
117 return dev->roce.reserved_gids.count;
118 }
119 EXPORT_SYMBOL_GPL(mlx5_core_reserved_gids_count);
120
mlx5_core_roce_gid_set(struct mlx5_core_dev * dev,unsigned int index,u8 roce_version,u8 roce_l3_type,const u8 * gid,const u8 * mac,bool vlan,u16 vlan_id)121 int mlx5_core_roce_gid_set(struct mlx5_core_dev *dev, unsigned int index,
122 u8 roce_version, u8 roce_l3_type, const u8 *gid,
123 const u8 *mac, bool vlan, u16 vlan_id)
124 {
125 #define MLX5_SET_RA(p, f, v) MLX5_SET(roce_addr_layout, p, f, v)
126 u32 in[MLX5_ST_SZ_DW(set_roce_address_in)] = {0};
127 u32 out[MLX5_ST_SZ_DW(set_roce_address_out)] = {0};
128 void *in_addr = MLX5_ADDR_OF(set_roce_address_in, in, roce_address);
129 char *addr_l3_addr = MLX5_ADDR_OF(roce_addr_layout, in_addr,
130 source_l3_address);
131 void *addr_mac = MLX5_ADDR_OF(roce_addr_layout, in_addr,
132 source_mac_47_32);
133 int gidsz = MLX5_FLD_SZ_BYTES(roce_addr_layout, source_l3_address);
134
135 if (MLX5_CAP_GEN(dev, port_type) != MLX5_CAP_PORT_TYPE_ETH)
136 return -EINVAL;
137
138 if (gid) {
139 if (vlan) {
140 MLX5_SET_RA(in_addr, vlan_valid, 1);
141 MLX5_SET_RA(in_addr, vlan_id, vlan_id);
142 }
143
144 ether_addr_copy(addr_mac, mac);
145 MLX5_SET_RA(in_addr, roce_version, roce_version);
146 MLX5_SET_RA(in_addr, roce_l3_type, roce_l3_type);
147 memcpy(addr_l3_addr, gid, gidsz);
148 }
149
150 MLX5_SET(set_roce_address_in, in, roce_address_index, index);
151 MLX5_SET(set_roce_address_in, in, opcode, MLX5_CMD_OP_SET_ROCE_ADDRESS);
152 return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
153 }
154 EXPORT_SYMBOL(mlx5_core_roce_gid_set);
155