net/smc/smc_llc.h

   1 /*
   2  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
   3  *
   4  *  Definitions for LLC (link layer control) message handling
   5  *
   6  *  Copyright IBM Corp. 2016
   7  *
   8  *  Author(s):  Klaus Wacker <Klaus.Wacker@de.ibm.com>
   9  *              Ursula Braun <ubraun@linux.vnet.ibm.com>
  10  */
  11
  12 #ifndef SMC_LLC_H
  13 #define SMC_LLC_H
  14
  15 #include "smc_wr.h"
  16
  17 #define SMC_LLC_FLAG_RESP               0x80
  18
  19 #define SMC_LLC_WAIT_FIRST_TIME         (5 * HZ)
  20
  21 enum smc_llc_reqresp {
  22         SMC_LLC_REQ,
  23         SMC_LLC_RESP
  24 };
  25
  26 enum smc_llc_msg_type {
  27         SMC_LLC_CONFIRM_LINK            = 0x01,
  28 };
  29
  30 #define SMC_LLC_DATA_LEN                40
  31
  32 struct smc_llc_hdr {
  33         struct smc_wr_rx_hdr common;
  34         u8 length;      /* 44 */
  35         u8 reserved;
  36         u8 flags;
  37 };
  38
  39 struct smc_llc_msg_confirm_link {       /* type 0x01 */
  40         struct smc_llc_hdr hd;
  41         u8 sender_mac[ETH_ALEN];
  42         u8 sender_gid[SMC_GID_SIZE];
  43         u8 sender_qp_num[3];
  44         u8 link_num;
  45         u8 link_uid[SMC_LGR_ID_SIZE];
  46         u8 max_links;
  47         u8 reserved[9];
  48 };
  49
  50 union smc_llc_msg {
  51         struct smc_llc_msg_confirm_link confirm_link;
  52         struct {
  53                 struct smc_llc_hdr hdr;
  54                 u8 data[SMC_LLC_DATA_LEN];
  55         } raw;
  56 };
  57
  58 /* transmit */
  59 int smc_llc_send_confirm_link(struct smc_link *lnk, u8 mac[], union ib_gid *gid,
  60                               enum smc_llc_reqresp reqresp);
  61 int smc_llc_init(void) __init;
  62
  63 #endif /* SMC_LLC_H */