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 <[email protected]>
  10  *              Ursula Braun <[email protected]>
  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
  22 enum smc_llc_reqresp {
  23         SMC_LLC_REQ,
  24         SMC_LLC_RESP
  25 };
  26
  27 enum smc_llc_msg_type {
  28         SMC_LLC_CONFIRM_LINK            = 0x01,
  29 };
  30
  31 #define SMC_LLC_DATA_LEN                40
  32
  33 struct smc_llc_hdr {
  34         struct smc_wr_rx_hdr common;
  35         u8 length;      /* 44 */
  36         u8 reserved;
  37         u8 flags;
  38 };
  39
  40 struct smc_llc_msg_confirm_link {       /* type 0x01 */
  41         struct smc_llc_hdr hd;
  42         u8 sender_mac[ETH_ALEN];
  43         u8 sender_gid[SMC_GID_SIZE];
  44         u8 sender_qp_num[3];
  45         u8 link_num;
  46         u8 link_uid[SMC_LGR_ID_SIZE];
  47         u8 max_links;
  48         u8 reserved[9];
  49 };
  50
  51 union smc_llc_msg {
  52         struct smc_llc_msg_confirm_link confirm_link;
  53         struct {
  54                 struct smc_llc_hdr hdr;
  55                 u8 data[SMC_LLC_DATA_LEN];
  56         } raw;
  57 };
  58
  59 /* transmit */
  60 int smc_llc_send_confirm_link(struct smc_link *lnk, u8 mac[], union ib_gid *gid,
  61                               enum smc_llc_reqresp reqresp);
  62 int smc_llc_init(void) __init;
  63
  64 #endif /* SMC_LLC_H */