1 | /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ |
2 | /* |
3 | * Copyright (c) 2005 Voltaire Inc. All rights reserved. |
4 | * Copyright (c) 2005 Intel Corporation. All rights reserved. |
5 | */ |
6 | |
7 | #ifndef IB_ADDR_H |
8 | #define IB_ADDR_H |
9 | |
10 | #include <linux/ethtool.h> |
11 | #include <linux/in.h> |
12 | #include <linux/in6.h> |
13 | #include <linux/if_arp.h> |
14 | #include <linux/netdevice.h> |
15 | #include <linux/inetdevice.h> |
16 | #include <linux/socket.h> |
17 | #include <linux/if_vlan.h> |
18 | #include <net/ipv6.h> |
19 | #include <net/if_inet6.h> |
20 | #include <net/ip.h> |
21 | #include <rdma/ib_verbs.h> |
22 | #include <rdma/ib_pack.h> |
23 | #include <net/net_namespace.h> |
24 | |
25 | /** |
26 | * struct rdma_dev_addr - Contains resolved RDMA hardware addresses |
27 | * @src_dev_addr: Source MAC address. |
28 | * @dst_dev_addr: Destination MAC address. |
29 | * @broadcast: Broadcast address of the device. |
30 | * @dev_type: The interface hardware type of the device. |
31 | * @bound_dev_if: An optional device interface index. |
32 | * @transport: The transport type used. |
33 | * @net: Network namespace containing the bound_dev_if net_dev. |
34 | * @sgid_attr: GID attribute to use for identified SGID |
35 | */ |
36 | struct rdma_dev_addr { |
37 | unsigned char src_dev_addr[MAX_ADDR_LEN]; |
38 | unsigned char dst_dev_addr[MAX_ADDR_LEN]; |
39 | unsigned char broadcast[MAX_ADDR_LEN]; |
40 | unsigned short dev_type; |
41 | int bound_dev_if; |
42 | enum rdma_transport_type transport; |
43 | struct net *net; |
44 | const struct ib_gid_attr *sgid_attr; |
45 | enum rdma_network_type network; |
46 | int hoplimit; |
47 | }; |
48 | |
49 | /** |
50 | * rdma_translate_ip - Translate a local IP address to an RDMA hardware |
51 | * address. |
52 | * |
53 | * The dev_addr->net field must be initialized. |
54 | */ |
55 | int rdma_translate_ip(const struct sockaddr *addr, |
56 | struct rdma_dev_addr *dev_addr); |
57 | |
58 | /** |
59 | * rdma_resolve_ip - Resolve source and destination IP addresses to |
60 | * RDMA hardware addresses. |
61 | * @src_addr: An optional source address to use in the resolution. If a |
62 | * source address is not provided, a usable address will be returned via |
63 | * the callback. |
64 | * @dst_addr: The destination address to resolve. |
65 | * @addr: A reference to a data location that will receive the resolved |
66 | * addresses. The data location must remain valid until the callback has |
67 | * been invoked. The net field of the addr struct must be valid. |
68 | * @timeout_ms: Amount of time to wait for the address resolution to complete. |
69 | * @callback: Call invoked once address resolution has completed, timed out, |
70 | * or been canceled. A status of 0 indicates success. |
71 | * @resolve_by_gid_attr: Resolve the ip based on the GID attribute from |
72 | * rdma_dev_addr. |
73 | * @context: User-specified context associated with the call. |
74 | */ |
75 | int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr, |
76 | struct rdma_dev_addr *addr, unsigned long timeout_ms, |
77 | void (*callback)(int status, struct sockaddr *src_addr, |
78 | struct rdma_dev_addr *addr, void *context), |
79 | bool resolve_by_gid_attr, void *context); |
80 | |
81 | void rdma_addr_cancel(struct rdma_dev_addr *addr); |
82 | |
83 | int rdma_addr_size(const struct sockaddr *addr); |
84 | int rdma_addr_size_in6(struct sockaddr_in6 *addr); |
85 | int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr); |
86 | |
87 | static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr) |
88 | { |
89 | return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9]; |
90 | } |
91 | |
92 | static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey) |
93 | { |
94 | dev_addr->broadcast[8] = pkey >> 8; |
95 | dev_addr->broadcast[9] = (unsigned char) pkey; |
96 | } |
97 | |
98 | static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr, |
99 | union ib_gid *gid) |
100 | { |
101 | memcpy(gid, dev_addr->broadcast + 4, sizeof *gid); |
102 | } |
103 | |
104 | static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr) |
105 | { |
106 | return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0; |
107 | } |
108 | |
109 | static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev) |
110 | { |
111 | return is_vlan_dev(dev) ? vlan_dev_vlan_id(dev) : 0xffff; |
112 | } |
113 | |
114 | static inline int rdma_ip2gid(struct sockaddr *addr, union ib_gid *gid) |
115 | { |
116 | switch (addr->sa_family) { |
117 | case AF_INET: |
118 | ipv6_addr_set_v4mapped(addr: ((struct sockaddr_in *) |
119 | addr)->sin_addr.s_addr, |
120 | v4mapped: (struct in6_addr *)gid); |
121 | break; |
122 | case AF_INET6: |
123 | *(struct in6_addr *)&gid->raw = |
124 | ((struct sockaddr_in6 *)addr)->sin6_addr; |
125 | break; |
126 | default: |
127 | return -EINVAL; |
128 | } |
129 | return 0; |
130 | } |
131 | |
132 | /* Important - sockaddr should be a union of sockaddr_in and sockaddr_in6 */ |
133 | static inline void rdma_gid2ip(struct sockaddr *out, const union ib_gid *gid) |
134 | { |
135 | if (ipv6_addr_v4mapped(a: (struct in6_addr *)gid)) { |
136 | struct sockaddr_in *out_in = (struct sockaddr_in *)out; |
137 | memset(out_in, 0, sizeof(*out_in)); |
138 | out_in->sin_family = AF_INET; |
139 | memcpy(&out_in->sin_addr.s_addr, gid->raw + 12, 4); |
140 | } else { |
141 | struct sockaddr_in6 *out_in = (struct sockaddr_in6 *)out; |
142 | memset(out_in, 0, sizeof(*out_in)); |
143 | out_in->sin6_family = AF_INET6; |
144 | memcpy(&out_in->sin6_addr.s6_addr, gid->raw, 16); |
145 | } |
146 | } |
147 | |
148 | /* |
149 | * rdma_get/set_sgid/dgid() APIs are applicable to IB, and iWarp. |
150 | * They are not applicable to RoCE. |
151 | * RoCE GIDs are derived from the IP addresses. |
152 | */ |
153 | static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) |
154 | { |
155 | memcpy(gid, dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), |
156 | sizeof(*gid)); |
157 | } |
158 | |
159 | static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) |
160 | { |
161 | memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid); |
162 | } |
163 | |
164 | static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) |
165 | { |
166 | memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid); |
167 | } |
168 | |
169 | static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) |
170 | { |
171 | memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid); |
172 | } |
173 | |
174 | static inline enum ib_mtu iboe_get_mtu(int mtu) |
175 | { |
176 | /* |
177 | * Reduce IB headers from effective IBoE MTU. |
178 | */ |
179 | mtu = mtu - (IB_GRH_BYTES + IB_UDP_BYTES + IB_BTH_BYTES + |
180 | IB_EXT_XRC_BYTES + IB_EXT_ATOMICETH_BYTES + |
181 | IB_ICRC_BYTES); |
182 | |
183 | if (mtu >= ib_mtu_enum_to_int(mtu: IB_MTU_4096)) |
184 | return IB_MTU_4096; |
185 | else if (mtu >= ib_mtu_enum_to_int(mtu: IB_MTU_2048)) |
186 | return IB_MTU_2048; |
187 | else if (mtu >= ib_mtu_enum_to_int(mtu: IB_MTU_1024)) |
188 | return IB_MTU_1024; |
189 | else if (mtu >= ib_mtu_enum_to_int(mtu: IB_MTU_512)) |
190 | return IB_MTU_512; |
191 | else if (mtu >= ib_mtu_enum_to_int(mtu: IB_MTU_256)) |
192 | return IB_MTU_256; |
193 | else |
194 | return 0; |
195 | } |
196 | |
197 | static inline int rdma_link_local_addr(struct in6_addr *addr) |
198 | { |
199 | if (addr->s6_addr32[0] == htonl(0xfe800000) && |
200 | addr->s6_addr32[1] == 0) |
201 | return 1; |
202 | |
203 | return 0; |
204 | } |
205 | |
206 | static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac) |
207 | { |
208 | memcpy(mac, &addr->s6_addr[8], 3); |
209 | memcpy(mac + 3, &addr->s6_addr[13], 3); |
210 | mac[0] ^= 2; |
211 | } |
212 | |
213 | static inline int rdma_is_multicast_addr(struct in6_addr *addr) |
214 | { |
215 | __be32 ipv4_addr; |
216 | |
217 | if (addr->s6_addr[0] == 0xff) |
218 | return 1; |
219 | |
220 | ipv4_addr = addr->s6_addr32[3]; |
221 | return (ipv6_addr_v4mapped(a: addr) && ipv4_is_multicast(addr: ipv4_addr)); |
222 | } |
223 | |
224 | static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac) |
225 | { |
226 | int i; |
227 | |
228 | mac[0] = 0x33; |
229 | mac[1] = 0x33; |
230 | for (i = 2; i < 6; ++i) |
231 | mac[i] = addr->s6_addr[i + 10]; |
232 | } |
233 | |
234 | static inline u16 rdma_get_vlan_id(union ib_gid *dgid) |
235 | { |
236 | u16 vid; |
237 | |
238 | vid = dgid->raw[11] << 8 | dgid->raw[12]; |
239 | return vid < 0x1000 ? vid : 0xffff; |
240 | } |
241 | |
242 | static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev) |
243 | { |
244 | return is_vlan_dev(dev) ? vlan_dev_real_dev(dev) : NULL; |
245 | } |
246 | |
247 | #endif /* IB_ADDR_H */ |
248 | |