1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* CLC (connection layer control) handshake over initial TCP socket to
* prepare for RDMA traffic
*
* Copyright IBM Corp. 2016
*
* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
*/
#ifndef _SMC_CLC_H
#define _SMC_CLC_H
#include <rdma/ib_verbs.h>
#include "smc.h"
#define SMC_CLC_PROPOSAL 0x01
#define SMC_CLC_ACCEPT 0x02
#define SMC_CLC_CONFIRM 0x03
#define SMC_CLC_DECLINE 0x04
#define SMC_TYPE_R 0 /* SMC-R only */
#define SMC_TYPE_D 1 /* SMC-D only */
#define SMC_TYPE_N 2 /* neither SMC-R nor SMC-D */
#define SMC_TYPE_B 3 /* SMC-R and SMC-D */
#define CLC_WAIT_TIME (6 * HZ) /* max. wait time on clcsock */
#define CLC_WAIT_TIME_SHORT HZ /* short wait time on clcsock */
#define SMC_CLC_DECL_MEM 0x01010000 /* insufficient memory resources */
#define SMC_CLC_DECL_TIMEOUT_CL 0x02010000 /* timeout w4 QP confirm link */
#define SMC_CLC_DECL_TIMEOUT_AL 0x02020000 /* timeout w4 QP add link */
#define SMC_CLC_DECL_CNFERR 0x03000000 /* configuration error */
#define SMC_CLC_DECL_PEERNOSMC 0x03010000 /* peer did not indicate SMC */
#define SMC_CLC_DECL_IPSEC 0x03020000 /* IPsec usage */
#define SMC_CLC_DECL_NOSMCDEV 0x03030000 /* no SMC device found (R or D) */
#define SMC_CLC_DECL_NOSMCDDEV 0x03030001 /* no SMC-D device found */
#define SMC_CLC_DECL_NOSMCRDEV 0x03030002 /* no SMC-R device found */
#define SMC_CLC_DECL_MODEUNSUPP 0x03040000 /* smc modes do not match (R or D)*/
#define SMC_CLC_DECL_RMBE_EC 0x03050000 /* peer has eyecatcher in RMBE */
#define SMC_CLC_DECL_OPTUNSUPP 0x03060000 /* fastopen sockopt not supported */
#define SMC_CLC_DECL_DIFFPREFIX 0x03070000 /* IP prefix / subnet mismatch */
#define SMC_CLC_DECL_GETVLANERR 0x03080000 /* err to get vlan id of ip device*/
#define SMC_CLC_DECL_ISMVLANERR 0x03090000 /* err to reg vlan id on ism dev */
#define SMC_CLC_DECL_NOACTLINK 0x030a0000 /* no active smc-r link in lgr */
#define SMC_CLC_DECL_NOSRVLINK 0x030b0000 /* SMC-R link from srv not found */
#define SMC_CLC_DECL_VERSMISMAT 0x030c0000 /* SMC version mismatch */
#define SMC_CLC_DECL_MAX_DMB 0x030d0000 /* SMC-D DMB limit exceeded */
#define SMC_CLC_DECL_SYNCERR 0x04000000 /* synchronization error */
#define SMC_CLC_DECL_PEERDECL 0x05000000 /* peer declined during handshake */
#define SMC_CLC_DECL_INTERR 0x09990000 /* internal error */
#define SMC_CLC_DECL_ERR_RTOK 0x09990001 /* rtoken handling failed */
#define SMC_CLC_DECL_ERR_RDYLNK 0x09990002 /* ib ready link failed */
#define SMC_CLC_DECL_ERR_REGRMB 0x09990003 /* reg rmb failed */
#define SMC_FIRST_CONTACT_MASK 0b10 /* first contact bit within typev2 */
struct smc_clc_msg_hdr { /* header1 of clc messages */
u8 eyecatcher[4]; /* eye catcher */
u8 type; /* proposal / accept / confirm / decline */
__be16 length;
#if defined(__BIG_ENDIAN_BITFIELD)
u8 version : 4,
typev2 : 2,
typev1 : 2;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
u8 typev1 : 2,
typev2 : 2,
version : 4;
#endif
} __packed; /* format defined in RFC7609 */
struct smc_clc_msg_trail { /* trailer of clc messages */
u8 eyecatcher[4];
};
struct smc_clc_msg_local { /* header2 of clc messages */
u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */
u8 gid[16]; /* gid of ib_device port */
u8 mac[6]; /* mac of ib_device port */
};
/* Struct would be 4 byte aligned, but it is used in an array that is sent
* to peers and must conform to RFC7609, hence we need to use packed here.
*/
struct smc_clc_ipv6_prefix {
struct in6_addr prefix;
u8 prefix_len;
} __packed; /* format defined in RFC7609 */
#if defined(__BIG_ENDIAN_BITFIELD)
struct smc_clc_v2_flag {
u8 release : 4,
rsvd : 3,
seid : 1;
};
#elif defined(__LITTLE_ENDIAN_BITFIELD)
struct smc_clc_v2_flag {
u8 seid : 1,
rsvd : 3,
release : 4;
};
#endif
struct smc_clnt_opts_area_hdr {
u8 eid_cnt; /* number of user defined EIDs */
u8 ism_gid_cnt; /* number of ISMv2 GIDs */
u8 reserved1;
struct smc_clc_v2_flag flag;
u8 reserved2[2];
__be16 smcd_v2_ext_offset; /* SMC-Dv2 Extension Offset */
};
struct smc_clc_smcd_gid_chid {
__be64 gid; /* ISM GID */
__be16 chid; /* ISMv2 CHID */
} __packed; /* format defined in
* IBM Shared Memory Communications Version 2
* (https://www.ibm.com/support/pages/node/6326337)
*/
struct smc_clc_v2_extension {
struct smc_clnt_opts_area_hdr hdr;
u8 roce[16]; /* RoCEv2 GID */
u8 reserved[16];
u8 user_eids[0][SMC_MAX_EID_LEN];
};
struct smc_clc_msg_proposal_prefix { /* prefix part of clc proposal message*/
__be32 outgoing_subnet; /* subnet mask */
u8 prefix_len; /* number of significant bits in mask */
u8 reserved[2];
u8 ipv6_prefixes_cnt; /* number of IPv6 prefixes in prefix array */
} __aligned(4);
struct smc_clc_msg_smcd { /* SMC-D GID information */
struct smc_clc_smcd_gid_chid ism; /* ISM native GID+CHID of requestor */
__be16 v2_ext_offset; /* SMC Version 2 Extension Offset */
u8 reserved[28];
};
struct smc_clc_smcd_v2_extension {
u8 system_eid[SMC_MAX_EID_LEN];
u8 reserved[16];
struct smc_clc_smcd_gid_chid gidchid[0];
};
struct smc_clc_msg_proposal { /* clc proposal message sent by Linux */
struct smc_clc_msg_hdr hdr;
struct smc_clc_msg_local lcl;
__be16 iparea_offset; /* offset to IP address information area */
} __aligned(4);
#define SMC_CLC_MAX_V6_PREFIX 8
struct smc_clc_msg_proposal_area {
struct smc_clc_msg_proposal pclc_base;
struct smc_clc_msg_smcd pclc_smcd;
struct smc_clc_msg_proposal_prefix pclc_prfx;
struct smc_clc_ipv6_prefix pclc_prfx_ipv6[SMC_CLC_MAX_V6_PREFIX];
struct smc_clc_v2_extension pclc_v2_ext;
struct smc_clc_smcd_v2_extension pclc_smcd_v2_ext;
struct smc_clc_smcd_gid_chid pclc_gidchids[SMC_MAX_ISM_DEVS];
struct smc_clc_msg_trail pclc_trl;
};
struct smcr_clc_msg_accept_confirm { /* SMCR accept/confirm */
struct smc_clc_msg_local lcl;
u8 qpn[3]; /* QP number */
__be32 rmb_rkey; /* RMB rkey */
u8 rmbe_idx; /* Index of RMBE in RMB */
__be32 rmbe_alert_token; /* unique connection id */
#if defined(__BIG_ENDIAN_BITFIELD)
u8 rmbe_size : 4, /* buf size (compressed) */
qp_mtu : 4; /* QP mtu */
#elif defined(__LITTLE_ENDIAN_BITFIELD)
u8 qp_mtu : 4,
rmbe_size : 4;
#endif
u8 reserved;
__be64 rmb_dma_addr; /* RMB virtual address */
u8 reserved2;
u8 psn[3]; /* packet sequence number */
} __packed;
struct smcd_clc_msg_accept_confirm_common { /* SMCD accept/confirm */
u64 gid; /* Sender GID */
u64 token; /* DMB token */
u8 dmbe_idx; /* DMBE index */
#if defined(__BIG_ENDIAN_BITFIELD)
u8 dmbe_size : 4, /* buf size (compressed) */
reserved3 : 4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
u8 reserved3 : 4,
dmbe_size : 4;
#endif
u16 reserved4;
__be32 linkid; /* Link identifier */
} __packed;
#define SMC_CLC_OS_ZOS 1
#define SMC_CLC_OS_LINUX 2
#define SMC_CLC_OS_AIX 3
struct smc_clc_first_contact_ext {
u8 reserved1;
#if defined(__BIG_ENDIAN_BITFIELD)
u8 os_type : 4,
release : 4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
u8 release : 4,
os_type : 4;
#endif
u8 reserved2[2];
u8 hostname[SMC_MAX_HOSTNAME_LEN];
};
struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */
struct smc_clc_msg_hdr hdr;
union {
struct smcr_clc_msg_accept_confirm r0; /* SMC-R */
struct { /* SMC-D */
struct smcd_clc_msg_accept_confirm_common d0;
u32 reserved5[3];
};
};
} __packed; /* format defined in RFC7609 */
struct smc_clc_msg_accept_confirm_v2 { /* clc accept / confirm message */
struct smc_clc_msg_hdr hdr;
union {
struct smcr_clc_msg_accept_confirm r0; /* SMC-R */
struct { /* SMC-D */
struct smcd_clc_msg_accept_confirm_common d0;
__be16 chid;
u8 eid[SMC_MAX_EID_LEN];
u8 reserved5[8];
};
};
};
struct smc_clc_msg_decline { /* clc decline message */
struct smc_clc_msg_hdr hdr;
u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
__be32 peer_diagnosis; /* diagnosis information */
u8 reserved2[4];
struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
} __aligned(4);
/* determine start of the prefix area within the proposal message */
static inline struct smc_clc_msg_proposal_prefix *
smc_clc_proposal_get_prefix(struct smc_clc_msg_proposal *pclc)
{
return (struct smc_clc_msg_proposal_prefix *)
((u8 *)pclc + sizeof(*pclc) + ntohs(pclc->iparea_offset));
}
static inline bool smcr_indicated(int smc_type)
{
return smc_type == SMC_TYPE_R || smc_type == SMC_TYPE_B;
}
static inline bool smcd_indicated(int smc_type)
{
return smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B;
}
/* get SMC-D info from proposal message */
static inline struct smc_clc_msg_smcd *
smc_get_clc_msg_smcd(struct smc_clc_msg_proposal *prop)
{
if (smcd_indicated(prop->hdr.typev1) &&
ntohs(prop->iparea_offset) != sizeof(struct smc_clc_msg_smcd))
return NULL;
return (struct smc_clc_msg_smcd *)(prop + 1);
}
static inline struct smc_clc_v2_extension *
smc_get_clc_v2_ext(struct smc_clc_msg_proposal *prop)
{
struct smc_clc_msg_smcd *prop_smcd = smc_get_clc_msg_smcd(prop);
if (!prop_smcd || !ntohs(prop_smcd->v2_ext_offset))
return NULL;
return (struct smc_clc_v2_extension *)
((u8 *)prop_smcd +
offsetof(struct smc_clc_msg_smcd, v2_ext_offset) +
sizeof(prop_smcd->v2_ext_offset) +
ntohs(prop_smcd->v2_ext_offset));
}
static inline struct smc_clc_smcd_v2_extension *
smc_get_clc_smcd_v2_ext(struct smc_clc_v2_extension *prop_v2ext)
{
if (!prop_v2ext)
return NULL;
if (!ntohs(prop_v2ext->hdr.smcd_v2_ext_offset))
return NULL;
return (struct smc_clc_smcd_v2_extension *)
((u8 *)prop_v2ext +
offsetof(struct smc_clc_v2_extension, hdr) +
offsetof(struct smc_clnt_opts_area_hdr, smcd_v2_ext_offset) +
sizeof(prop_v2ext->hdr.smcd_v2_ext_offset) +
ntohs(prop_v2ext->hdr.smcd_v2_ext_offset));
}
struct smcd_dev;
struct smc_init_info;
int smc_clc_prfx_match(struct socket *clcsock,
struct smc_clc_msg_proposal_prefix *prop);
int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
u8 expected_type, unsigned long timeout);
int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info);
int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini);
int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
u8 version);
int smc_clc_send_accept(struct smc_sock *smc, bool srv_first_contact,
u8 version);
void smc_clc_init(void) __init;
#endif
|
