License cleanup: add SPDX GPL-2.0 license identifier to files with no license
[linux-block.git] / 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
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 */