LXR linux/net/smc/smc

   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 */
  25static 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
  39struct 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
  54struct smc_clc_msg_trail {      /* trailer of clc messages */
  55        u8 eyecatcher[4];
  56};
  57
  58struct 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
  64struct 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
  75struct 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
  96struct 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
 104struct smc_sock;
 105struct smc_ib_device;
 106
 107int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
 108                     u8 expected_type);
 109int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info,
 110                         u8 out_of_sync);
 111int smc_clc_send_proposal(struct smc_sock *smc, struct smc_ib_device *smcibdev,
 112                          u8 ibport);
 113int smc_clc_send_confirm(struct smc_sock *smc);
 114int smc_clc_send_accept(struct smc_sock *smc, int srv_first_contact);
 115
 116#endif
 117