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/mlx5/driver.h>
34 #include <linux/etherdevice.h>
35 #include <linux/idr.h>
36 #include "mlx5_core.h"
37 #include "lib/mlx5.h"
38 
mlx5_init_reserved_gids(struct mlx5_core_dev * dev)39 void mlx5_init_reserved_gids(struct mlx5_core_dev *dev)
40 {
41 	unsigned int tblsz = MLX5_CAP_ROCE(dev, roce_address_table_size);
42 
43 	ida_init(&dev->roce.reserved_gids.ida);
44 	dev->roce.reserved_gids.start = tblsz;
45 	dev->roce.reserved_gids.count = 0;
46 }
47 
mlx5_cleanup_reserved_gids(struct mlx5_core_dev * dev)48 void mlx5_cleanup_reserved_gids(struct mlx5_core_dev *dev)
49 {
50 	WARN_ON(!ida_is_empty(&dev->roce.reserved_gids.ida));
51 	dev->roce.reserved_gids.start = 0;
52 	dev->roce.reserved_gids.count = 0;
53 	ida_destroy(&dev->roce.reserved_gids.ida);
54 }
55 
mlx5_core_reserve_gids(struct mlx5_core_dev * dev,unsigned int count)56 int mlx5_core_reserve_gids(struct mlx5_core_dev *dev, unsigned int count)
57 {
58 	if (dev->roce.reserved_gids.start < count) {
59 		mlx5_core_warn(dev, "GID table exhausted attempting to reserve %d more GIDs\n",
60 			       count);
61 		return -ENOMEM;
62 	}
63 	if (dev->roce.reserved_gids.count + count > MLX5_MAX_RESERVED_GIDS) {
64 		mlx5_core_warn(dev, "Unable to reserve %d more GIDs\n", count);
65 		return -ENOMEM;
66 	}
67 
68 	dev->roce.reserved_gids.start -= count;
69 	dev->roce.reserved_gids.count += count;
70 	mlx5_core_dbg(dev, "Reserved %u GIDs starting at %u\n",
71 		      dev->roce.reserved_gids.count,
72 		      dev->roce.reserved_gids.start);
73 	return 0;
74 }
75 
mlx5_core_unreserve_gids(struct mlx5_core_dev * dev,unsigned int count)76 void mlx5_core_unreserve_gids(struct mlx5_core_dev *dev, unsigned int count)
77 {
78 	WARN(count > dev->roce.reserved_gids.count, "Unreserving %u GIDs when only %u reserved",
79 	     count, dev->roce.reserved_gids.count);
80 
81 	dev->roce.reserved_gids.start += count;
82 	dev->roce.reserved_gids.count -= count;
83 	mlx5_core_dbg(dev, "%u GIDs starting at %u left reserved\n",
84 		      dev->roce.reserved_gids.count,
85 		      dev->roce.reserved_gids.start);
86 }
87 
mlx5_core_reserved_gid_alloc(struct mlx5_core_dev * dev,int * gid_index)88 int mlx5_core_reserved_gid_alloc(struct mlx5_core_dev *dev, int *gid_index)
89 {
90 	int end = dev->roce.reserved_gids.start +
91 		  dev->roce.reserved_gids.count - 1;
92 	int index = 0;
93 
94 	index = ida_alloc_range(&dev->roce.reserved_gids.ida,
95 				dev->roce.reserved_gids.start, end,
96 				GFP_KERNEL);
97 	if (index < 0)
98 		return index;
99 
100 	mlx5_core_dbg(dev, "Allocating reserved GID %u\n", index);
101 	*gid_index = index;
102 	return 0;
103 }
104 
mlx5_core_reserved_gid_free(struct mlx5_core_dev * dev,int gid_index)105 void mlx5_core_reserved_gid_free(struct mlx5_core_dev *dev, int gid_index)
106 {
107 	mlx5_core_dbg(dev, "Freeing reserved GID %u\n", gid_index);
108 	ida_free(&dev->roce.reserved_gids.ida, gid_index);
109 }
110 
mlx5_core_reserved_gids_count(struct mlx5_core_dev * dev)111 unsigned int mlx5_core_reserved_gids_count(struct mlx5_core_dev *dev)
112 {
113 	return dev->roce.reserved_gids.count;
114 }
115 EXPORT_SYMBOL_GPL(mlx5_core_reserved_gids_count);
116 
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,u8 port_num)117 int mlx5_core_roce_gid_set(struct mlx5_core_dev *dev, unsigned int index,
118 			   u8 roce_version, u8 roce_l3_type, const u8 *gid,
119 			   const u8 *mac, bool vlan, u16 vlan_id, u8 port_num)
120 {
121 #define MLX5_SET_RA(p, f, v) MLX5_SET(roce_addr_layout, p, f, v)
122 	u32 in[MLX5_ST_SZ_DW(set_roce_address_in)] = {};
123 	void *in_addr = MLX5_ADDR_OF(set_roce_address_in, in, roce_address);
124 	char *addr_l3_addr = MLX5_ADDR_OF(roce_addr_layout, in_addr,
125 					  source_l3_address);
126 	void *addr_mac = MLX5_ADDR_OF(roce_addr_layout, in_addr,
127 				      source_mac_47_32);
128 	int gidsz = MLX5_FLD_SZ_BYTES(roce_addr_layout, source_l3_address);
129 
130 	if (MLX5_CAP_GEN(dev, port_type) != MLX5_CAP_PORT_TYPE_ETH)
131 		return -EINVAL;
132 
133 	if (gid) {
134 		if (vlan) {
135 			MLX5_SET_RA(in_addr, vlan_valid, 1);
136 			MLX5_SET_RA(in_addr, vlan_id, vlan_id);
137 		}
138 
139 		ether_addr_copy(addr_mac, mac);
140 		memcpy(addr_l3_addr, gid, gidsz);
141 	}
142 	MLX5_SET_RA(in_addr, roce_version, roce_version);
143 	MLX5_SET_RA(in_addr, roce_l3_type, roce_l3_type);
144 
145 	if (MLX5_CAP_GEN(dev, num_vhca_ports) > 0)
146 		MLX5_SET(set_roce_address_in, in, vhca_port_num, port_num);
147 
148 	MLX5_SET(set_roce_address_in, in, roce_address_index, index);
149 	MLX5_SET(set_roce_address_in, in, opcode, MLX5_CMD_OP_SET_ROCE_ADDRESS);
150 	return mlx5_cmd_exec_in(dev, set_roce_address, in);
151 }
152 EXPORT_SYMBOL(mlx5_core_roce_gid_set);
153