net/smc/smc_llc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
   4  *
   5  *  Definitions for LLC (link layer control) message handling
   6  *
   7  *  Copyright IBM Corp. 2016
   8  *
   9  *  Author(s):  Klaus Wacker <Klaus.Wacker@de.ibm.com>
  10  *              Ursula Braun <ubraun@linux.vnet.ibm.com>
  11  */
  12
  13 #ifndef SMC_LLC_H
  14 #define SMC_LLC_H
  15
  16 #include "smc_wr.h"
  17
  18 #define SMC_LLC_FLAG_RESP               0x80
  19
  20 #define SMC_LLC_WAIT_FIRST_TIME         (5 * HZ)
  21 #define SMC_LLC_WAIT_TIME               (2 * HZ)
  22
  23 enum smc_llc_reqresp {
  24         SMC_LLC_REQ,
  25         SMC_LLC_RESP
  26 };
  27
  28 enum smc_llc_msg_type {
  29         SMC_LLC_CONFIRM_LINK            = 0x01,
  30         SMC_LLC_ADD_LINK                = 0x02,
  31         SMC_LLC_ADD_LINK_CONT           = 0x03,
  32         SMC_LLC_DELETE_LINK             = 0x04,
  33         SMC_LLC_REQ_ADD_LINK            = 0x05,
  34         SMC_LLC_CONFIRM_RKEY            = 0x06,
  35         SMC_LLC_TEST_LINK               = 0x07,
  36         SMC_LLC_CONFIRM_RKEY_CONT       = 0x08,
  37         SMC_LLC_DELETE_RKEY             = 0x09,
  38         /* V2 types */
  39         SMC_LLC_CONFIRM_LINK_V2         = 0x21,
  40         SMC_LLC_ADD_LINK_V2             = 0x22,
  41         SMC_LLC_DELETE_LINK_V2          = 0x24,
  42         SMC_LLC_REQ_ADD_LINK_V2         = 0x25,
  43         SMC_LLC_CONFIRM_RKEY_V2         = 0x26,
  44         SMC_LLC_TEST_LINK_V2            = 0x27,
  45         SMC_LLC_DELETE_RKEY_V2          = 0x29,
  46 };
  47
  48 #define smc_link_downing(state) \
  49         (cmpxchg(state, SMC_LNK_ACTIVE, SMC_LNK_INACTIVE) == SMC_LNK_ACTIVE)
  50
  51 /* LLC DELETE LINK Request Reason Codes */
  52 #define SMC_LLC_DEL_LOST_PATH           0x00010000
  53 #define SMC_LLC_DEL_OP_INIT_TERM        0x00020000
  54 #define SMC_LLC_DEL_PROG_INIT_TERM      0x00030000
  55 #define SMC_LLC_DEL_PROT_VIOL           0x00040000
  56 #define SMC_LLC_DEL_NO_ASYM_NEEDED      0x00050000
  57 /* LLC DELETE LINK Response Reason Codes */
  58 #define SMC_LLC_DEL_NOLNK       0x00100000  /* Unknown Link ID (no link) */
  59 #define SMC_LLC_DEL_NOLGR       0x00200000  /* Unknown Link Group */
  60
  61 /* returns a usable link of the link group, or NULL */
  62 static inline struct smc_link *smc_llc_usable_link(struct smc_link_group *lgr)
  63 {
  64         int i;
  65
  66         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
  67                 if (smc_link_usable(&lgr->lnk[i]))
  68                         return &lgr->lnk[i];
  69         return NULL;
  70 }
  71
  72 /* set the termination reason code for the link group */
  73 static inline void smc_llc_set_termination_rsn(struct smc_link_group *lgr,
  74                                                u32 rsn)
  75 {
  76         if (!lgr->llc_termination_rsn)
  77                 lgr->llc_termination_rsn = rsn;
  78 }
  79
  80 /* transmit */
  81 int smc_llc_send_confirm_link(struct smc_link *lnk,
  82                               enum smc_llc_reqresp reqresp);
  83 int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
  84                           struct smc_link *link_new,
  85                           enum smc_llc_reqresp reqresp);
  86 int smc_llc_send_delete_link(struct smc_link *link, u8 link_del_id,
  87                              enum smc_llc_reqresp reqresp, bool orderly,
  88                              u32 reason);
  89 void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id);
  90 void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc);
  91 void smc_llc_lgr_clear(struct smc_link_group *lgr);
  92 int smc_llc_link_init(struct smc_link *link);
  93 void smc_llc_link_active(struct smc_link *link);
  94 void smc_llc_link_clear(struct smc_link *link, bool log);
  95 int smc_llc_do_confirm_rkey(struct smc_link *send_link,
  96                             struct smc_buf_desc *rmb_desc);
  97 int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
  98                            struct smc_buf_desc *rmb_desc);
  99 int smc_llc_flow_initiate(struct smc_link_group *lgr,
 100                           enum smc_llc_flowtype type);
 101 void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow);
 102 int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
 103                            enum smc_llc_reqresp type);
 104 void smc_llc_link_set_uid(struct smc_link *link);
 105 void smc_llc_save_peer_uid(struct smc_llc_qentry *qentry);
 106 struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
 107                                     struct smc_link *lnk,
 108                                     int time_out, u8 exp_msg);
 109 struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow);
 110 void smc_llc_flow_qentry_del(struct smc_llc_flow *flow);
 111 void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord,
 112                                   u32 rsn);
 113 int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry);
 114 int smc_llc_srv_add_link(struct smc_link *link,
 115                          struct smc_llc_qentry *req_qentry);
 116 void smc_llc_add_link_local(struct smc_link *link);
 117 int smc_llc_init(void) __init;
 118
 119 #endif /* SMC_LLC_H */