1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
5 * Definitions for LLC (link layer control) message handling
7 * Copyright IBM Corp. 2016
9 * Author(s): Klaus Wacker <Klaus.Wacker@de.ibm.com>
10 * Ursula Braun <ubraun@linux.vnet.ibm.com>
18 #define SMC_LLC_FLAG_RESP 0x80
20 #define SMC_LLC_WAIT_FIRST_TIME (5 * HZ)
21 #define SMC_LLC_WAIT_TIME (2 * HZ)
23 enum smc_llc_reqresp
{
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_CONFIRM_RKEY
= 0x06,
34 SMC_LLC_TEST_LINK
= 0x07,
35 SMC_LLC_CONFIRM_RKEY_CONT
= 0x08,
36 SMC_LLC_DELETE_RKEY
= 0x09,
39 #define smc_link_downing(state) \
40 (cmpxchg(state, SMC_LNK_ACTIVE, SMC_LNK_INACTIVE) == SMC_LNK_ACTIVE)
42 /* LLC DELETE LINK Request Reason Codes */
43 #define SMC_LLC_DEL_LOST_PATH 0x00010000
44 #define SMC_LLC_DEL_OP_INIT_TERM 0x00020000
45 #define SMC_LLC_DEL_PROG_INIT_TERM 0x00030000
46 #define SMC_LLC_DEL_PROT_VIOL 0x00040000
47 #define SMC_LLC_DEL_NO_ASYM_NEEDED 0x00050000
48 /* LLC DELETE LINK Response Reason Codes */
49 #define SMC_LLC_DEL_NOLNK 0x00100000 /* Unknown Link ID (no link) */
50 #define SMC_LLC_DEL_NOLGR 0x00200000 /* Unknown Link Group */
52 /* returns a usable link of the link group, or NULL */
53 static inline struct smc_link
*smc_llc_usable_link(struct smc_link_group
*lgr
)
57 for (i
= 0; i
< SMC_LINKS_PER_LGR_MAX
; i
++)
58 if (smc_link_usable(&lgr
->lnk
[i
]))
64 int smc_llc_send_confirm_link(struct smc_link
*lnk
,
65 enum smc_llc_reqresp reqresp
);
66 int smc_llc_send_add_link(struct smc_link
*link
, u8 mac
[], u8 gid
[],
67 struct smc_link
*link_new
,
68 enum smc_llc_reqresp reqresp
);
69 int smc_llc_send_delete_link(struct smc_link
*link
, u8 link_del_id
,
70 enum smc_llc_reqresp reqresp
, bool orderly
,
72 void smc_llc_srv_delete_link_local(struct smc_link
*link
, u8 del_link_id
);
73 void smc_llc_lgr_init(struct smc_link_group
*lgr
, struct smc_sock
*smc
);
74 void smc_llc_lgr_clear(struct smc_link_group
*lgr
);
75 int smc_llc_link_init(struct smc_link
*link
);
76 void smc_llc_link_active(struct smc_link
*link
);
77 void smc_llc_link_clear(struct smc_link
*link
);
78 int smc_llc_do_confirm_rkey(struct smc_link
*send_link
,
79 struct smc_buf_desc
*rmb_desc
);
80 int smc_llc_do_delete_rkey(struct smc_link_group
*lgr
,
81 struct smc_buf_desc
*rmb_desc
);
82 int smc_llc_flow_initiate(struct smc_link_group
*lgr
,
83 enum smc_llc_flowtype type
);
84 void smc_llc_flow_stop(struct smc_link_group
*lgr
, struct smc_llc_flow
*flow
);
85 int smc_llc_eval_conf_link(struct smc_llc_qentry
*qentry
,
86 enum smc_llc_reqresp type
);
87 struct smc_llc_qentry
*smc_llc_wait(struct smc_link_group
*lgr
,
89 int time_out
, u8 exp_msg
);
90 struct smc_llc_qentry
*smc_llc_flow_qentry_clr(struct smc_llc_flow
*flow
);
91 void smc_llc_flow_qentry_del(struct smc_llc_flow
*flow
);
92 int smc_llc_cli_add_link(struct smc_link
*link
, struct smc_llc_qentry
*qentry
);
93 int smc_llc_srv_add_link(struct smc_link
*link
);
94 void smc_llc_srv_add_link_local(struct smc_link
*link
);
95 int smc_llc_init(void) __init
;
97 #endif /* SMC_LLC_H */