LXR linux/net/smc/smc

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 *  Shared Memory Communications over RDMA (SMC-R) and RoCE
   4 *
   5 *  CLC (connection layer control) handshake over initial TCP socket to
   6 *  prepare for RDMA traffic
   7 *
   8 *  Copyright IBM Corp. 2016
   9 *
  10 *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
  11 */
  12
  13#ifndef _SMC_CLC_H
  14#define _SMC_CLC_H
  15
  16#include <rdma/ib_verbs.h>
  17
  18#include "smc.h"
  19
  20#define SMC_CLC_PROPOSAL        0x01
  21#define SMC_CLC_ACCEPT          0x02
  22#define SMC_CLC_CONFIRM         0x03
  23#define SMC_CLC_DECLINE         0x04
  24
  25/* eye catcher "SMCR" EBCDIC for CLC messages */
  26static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
  27
  28#define SMC_CLC_V1              0x1             /* SMC version                */
  29#define CLC_WAIT_TIME           (6 * HZ)        /* max. wait time on clcsock  */
  30#define SMC_CLC_DECL_MEM        0x01010000  /* insufficient memory resources  */
  31#define SMC_CLC_DECL_TIMEOUT    0x02000000  /* timeout                        */
  32#define SMC_CLC_DECL_CNFERR     0x03000000  /* configuration error            */
  33#define SMC_CLC_DECL_IPSEC      0x03030000  /* IPsec usage                    */
  34#define SMC_CLC_DECL_SYNCERR    0x04000000  /* synchronization error          */
  35#define SMC_CLC_DECL_REPLY      0x06000000  /* reply to a received decline    */
  36#define SMC_CLC_DECL_INTERR     0x99990000  /* internal error                 */
  37#define SMC_CLC_DECL_TCL        0x02040000  /* timeout w4 QP confirm          */
  38#define SMC_CLC_DECL_SEND       0x07000000  /* sending problem                */
  39
  40struct smc_clc_msg_hdr {        /* header1 of clc messages */
  41        u8 eyecatcher[4];       /* eye catcher */
  42        u8 type;                /* proposal / accept / confirm / decline */
  43        __be16 length;
  44#if defined(__BIG_ENDIAN_BITFIELD)
  45        u8 version : 4,
  46           flag    : 1,
  47           rsvd    : 3;
  48#elif defined(__LITTLE_ENDIAN_BITFIELD)
  49        u8 rsvd    : 3,
  50           flag    : 1,
  51           version : 4;
  52#endif
  53} __packed;                     /* format defined in RFC7609 */
  54
  55struct smc_clc_msg_trail {      /* trailer of clc messages */
  56        u8 eyecatcher[4];
  57};
  58
  59struct smc_clc_msg_local {      /* header2 of clc messages */
  60        u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */
  61        u8 gid[16];             /* gid of ib_device port */
  62        u8 mac[6];              /* mac of ib_device port */
  63};
  64
  65struct smc_clc_msg_proposal {   /* clc proposal message */
  66        struct smc_clc_msg_hdr hdr;
  67        struct smc_clc_msg_local lcl;
  68        __be16 iparea_offset;   /* offset to IP address information area */
  69        __be32 outgoing_subnet; /* subnet mask */
  70        u8 prefix_len;          /* number of significant bits in mask */
  71        u8 reserved[2];
  72        u8 ipv6_prefixes_cnt;   /* number of IPv6 prefixes in prefix array */
  73        struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
  74} __aligned(4);
  75
  76struct smc_clc_msg_accept_confirm {     /* clc accept / confirm message */
  77        struct smc_clc_msg_hdr hdr;
  78        struct smc_clc_msg_local lcl;
  79        u8 qpn[3];              /* QP number */
  80        __be32 rmb_rkey;        /* RMB rkey */
  81        u8 conn_idx;            /* Connection index, which RMBE in RMB */
  82        __be32 rmbe_alert_token;/* unique connection id */
  83#if defined(__BIG_ENDIAN_BITFIELD)
  84        u8 rmbe_size : 4,       /* RMBE buf size (compressed notation) */
  85           qp_mtu   : 4;        /* QP mtu */
  86#elif defined(__LITTLE_ENDIAN_BITFIELD)
  87        u8 qp_mtu   : 4,
  88           rmbe_size : 4;
  89#endif
  90        u8 reserved;
  91        __be64 rmb_dma_addr;    /* RMB virtual address */
  92        u8 reserved2;
  93        u8 psn[3];              /* initial packet sequence number */
  94        struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
  95} __packed;                     /* format defined in RFC7609 */
  96
  97struct smc_clc_msg_decline {    /* clc decline message */
  98        struct smc_clc_msg_hdr hdr;
  99        u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
 100        __be32 peer_diagnosis;  /* diagnosis information */
 101        u8 reserved2[4];
 102        struct smc_clc_msg_trail trl; /* eye catcher "SMCR" EBCDIC */
 103} __aligned(4);
 104
 105struct smc_sock;
 106struct smc_ib_device;
 107
 108int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
 109                     u8 expected_type);
 110int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info);
 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