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1 /*
2  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
3  *
4  *  CLC (connection layer control) handshake over initial TCP socket to
5  *  prepare for RDMA traffic
6  *
7  *  Copyright IBM Corp. 2016
8  *
9  *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
10  */
11
12 #ifndef _SMC_CLC_H
13 #define _SMC_CLC_H
14
15 #include <rdma/ib_verbs.h>
16
17 #include "smc.h"
18
19 #define SMC_CLC_PROPOSAL        0x01
20 #define SMC_CLC_ACCEPT          0x02
21 #define SMC_CLC_CONFIRM         0x03
22 #define SMC_CLC_DECLINE         0x04
23
24 /* eye catcher "SMCR" EBCDIC for CLC messages */
25 static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
26
27 #define SMC_CLC_V1              0x1             /* SMC version                */
28 #define CLC_WAIT_TIME           (6 * HZ)        /* max. wait time on clcsock  */
29 #define SMC_CLC_DECL_MEM        0x01010000  /* insufficient memory resources  */
30 #define SMC_CLC_DECL_TIMEOUT    0x02000000  /* timeout                        */
31 #define SMC_CLC_DECL_CNFERR     0x03000000  /* configuration error            */
32 #define SMC_CLC_DECL_IPSEC      0x03030000  /* IPsec usage                    */
33 #define SMC_CLC_DECL_SYNCERR    0x04000000  /* synchronization error          */
34 #define SMC_CLC_DECL_REPLY      0x06000000  /* reply to a received decline    */
35 #define SMC_CLC_DECL_INTERR     0x99990000  /* internal error                 */
36 #define SMC_CLC_DECL_TCL        0x02040000  /* timeout w4 QP confirm          */
37 #define SMC_CLC_DECL_SEND       0x07000000  /* sending problem                */
38
39 struct smc_clc_msg_hdr {        /* header1 of clc messages */
40         u8 eyecatcher[4];       /* eye catcher */
41         u8 type;                /* proposal / accept / confirm / decline */
42         __be16 length;
43 #if defined(__BIG_ENDIAN_BITFIELD)
44         u8 version : 4,
45            flag    : 1,
46            rsvd    : 3;
47 #elif defined(__LITTLE_ENDIAN_BITFIELD)
48         u8 rsvd    : 3,
49            flag    : 1,
50            version : 4;
51 #endif
52 } __packed;                     /* format defined in RFC7609 */
53
54 struct smc_clc_msg_trail {      /* trailer of clc messages */
55         u8 eyecatcher[4];
56 };
57
58 struct smc_clc_msg_local {      /* header2 of clc messages */
59         u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */
60         u8 gid[16];             /* gid of ib_device port */
61         u8 mac[6];              /* mac of ib_device port */
62 };
63
64 struct smc_clc_msg_proposal {   /* clc proposal message */
65         struct smc_clc_msg_hdr hdr;
66         struct smc_clc_msg_local lcl;
67         __be16 iparea_offset;   /* offset to IP address information area */
68         __be32 outgoing_subnet; /* subnet mask */
69         u8 prefix_len;          /* number of significant bits in mask */
70         u8 reserved[2];
71         u8 ipv6_prefixes_cnt;   /* number of IPv6 prefixes in prefix array */
72         struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
73 } __aligned(4);
74
75 struct smc_clc_msg_accept_confirm {     /* clc accept / confirm message */
76         struct smc_clc_msg_hdr hdr;
77         struct smc_clc_msg_local lcl;
78         u8 qpn[3];              /* QP number */
79         __be32 rmb_rkey;        /* RMB rkey */
80         u8 conn_idx;            /* Connection index, which RMBE in RMB */
81         __be32 rmbe_alert_token;/* unique connection id */
82 #if defined(__BIG_ENDIAN_BITFIELD)
83         u8 rmbe_size : 4,       /* RMBE buf size (compressed notation) */
84            qp_mtu   : 4;        /* QP mtu */
85 #elif defined(__LITTLE_ENDIAN_BITFIELD)
86         u8 qp_mtu   : 4,
87            rmbe_size : 4;
88 #endif
89         u8 reserved;
90         __be64 rmb_dma_addr;    /* RMB virtual address */
91         u8 reserved2;
92         u8 psn[3];              /* initial packet sequence number */
93         struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
94 } __packed;                     /* format defined in RFC7609 */
95
96 struct smc_clc_msg_decline {    /* clc decline message */
97         struct smc_clc_msg_hdr hdr;
98         u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
99         __be32 peer_diagnosis;  /* diagnosis information */
100         u8 reserved2[4];
101         struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
102 } __aligned(4);
103
104 struct smc_sock;
105 struct smc_ib_device;
106
107 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
108                      u8 expected_type);
109 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info,
110                          u8 out_of_sync);
111 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_ib_device *smcibdev,
112                           u8 ibport);
113 int smc_clc_send_confirm(struct smc_sock *smc);
114 int smc_clc_send_accept(struct smc_sock *smc, int srv_first_contact);
115
116 #endif