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 #define SMC_LLC_TESTLINK_DEFAULT_TIME (30 * HZ)
23
24 enum smc_llc_reqresp {
25 SMC_LLC_REQ,
26 SMC_LLC_RESP
27 };
28
29 enum smc_llc_msg_type {
30 SMC_LLC_CONFIRM_LINK = 0x01,
31 SMC_LLC_ADD_LINK = 0x02,
32 SMC_LLC_ADD_LINK_CONT = 0x03,
33 SMC_LLC_DELETE_LINK = 0x04,
34 SMC_LLC_REQ_ADD_LINK = 0x05,
35 SMC_LLC_CONFIRM_RKEY = 0x06,
36 SMC_LLC_TEST_LINK = 0x07,
37 SMC_LLC_CONFIRM_RKEY_CONT = 0x08,
38 SMC_LLC_DELETE_RKEY = 0x09,
39 /* V2 types */
40 SMC_LLC_CONFIRM_LINK_V2 = 0x21,
41 SMC_LLC_ADD_LINK_V2 = 0x22,
42 SMC_LLC_DELETE_LINK_V2 = 0x24,
43 SMC_LLC_REQ_ADD_LINK_V2 = 0x25,
44 SMC_LLC_CONFIRM_RKEY_V2 = 0x26,
45 SMC_LLC_TEST_LINK_V2 = 0x27,
46 SMC_LLC_DELETE_RKEY_V2 = 0x29,
47 };
48
49 #define smc_link_downing(state) \
50 (cmpxchg(state, SMC_LNK_ACTIVE, SMC_LNK_INACTIVE) == SMC_LNK_ACTIVE)
51
52 /* LLC DELETE LINK Request Reason Codes */
53 #define SMC_LLC_DEL_LOST_PATH 0x00010000
54 #define SMC_LLC_DEL_OP_INIT_TERM 0x00020000
55 #define SMC_LLC_DEL_PROG_INIT_TERM 0x00030000
56 #define SMC_LLC_DEL_PROT_VIOL 0x00040000
57 #define SMC_LLC_DEL_NO_ASYM_NEEDED 0x00050000
58 /* LLC DELETE LINK Response Reason Codes */
59 #define SMC_LLC_DEL_NOLNK 0x00100000 /* Unknown Link ID (no link) */
60 #define SMC_LLC_DEL_NOLGR 0x00200000 /* Unknown Link Group */
61
62 /* returns a usable link of the link group, or NULL */
63 static inline struct smc_link *smc_llc_usable_link(struct smc_link_group *lgr)
64 {
65 int i;
66
67 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
68 if (smc_link_usable(&lgr->lnk[i]))
69 return &lgr->lnk[i];
70 return NULL;
71 }
72
73 /* set the termination reason code for the link group */
74 static inline void smc_llc_set_termination_rsn(struct smc_link_group *lgr,
75 u32 rsn)
76 {
77 if (!lgr->llc_termination_rsn)
78 lgr->llc_termination_rsn = rsn;
79 }
80
81 /* transmit */
82 int smc_llc_send_confirm_link(struct smc_link *lnk,
83 enum smc_llc_reqresp reqresp);
84 int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
85 struct smc_link *link_new,
86 enum smc_llc_reqresp reqresp);
87 int smc_llc_send_delete_link(struct smc_link *link, u8 link_del_id,
88 enum smc_llc_reqresp reqresp, bool orderly,
89 u32 reason);
90 void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id);
91 void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc);
92 void smc_llc_lgr_clear(struct smc_link_group *lgr);
93 int smc_llc_link_init(struct smc_link *link);
94 void smc_llc_link_active(struct smc_link *link);
95 void smc_llc_link_clear(struct smc_link *link, bool log);
96 int smc_llc_do_confirm_rkey(struct smc_link *send_link,
97 struct smc_buf_desc *rmb_desc);
98 int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
99 struct smc_buf_desc *rmb_desc);
100 int smc_llc_flow_initiate(struct smc_link_group *lgr,
101 enum smc_llc_flowtype type);
102 void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow);
103 int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
104 enum smc_llc_reqresp type);
105 void smc_llc_link_set_uid(struct smc_link *link);
106 void smc_llc_save_peer_uid(struct smc_llc_qentry *qentry);
107 struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
108 struct smc_link *lnk,
109 int time_out, u8 exp_msg);
110 struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow);
111 void smc_llc_flow_qentry_del(struct smc_llc_flow *flow);
112 void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord,
113 u32 rsn);
114 int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry);
115 int smc_llc_srv_add_link(struct smc_link *link,
116 struct smc_llc_qentry *req_qentry);
117 void smc_llc_add_link_local(struct smc_link *link);
118 int smc_llc_init(void) __init;
119
120 #endif /* SMC_LLC_H */
121
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