]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - net/smc/smc_llc.h
net/smc: save state of last sent CDC message
[mirror_ubuntu-jammy-kernel.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 #define SMC_LLC_WAIT_TIME (2 * HZ)
22
23 enum smc_llc_reqresp {
24 SMC_LLC_REQ,
25 SMC_LLC_RESP
26 };
27
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,
37 };
38
39 #define smc_link_downing(state) \
40 (cmpxchg(state, SMC_LNK_ACTIVE, SMC_LNK_INACTIVE) == SMC_LNK_ACTIVE)
41
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 */
51
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)
54 {
55 int i;
56
57 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
58 if (smc_link_usable(&lgr->lnk[i]))
59 return &lgr->lnk[i];
60 return NULL;
61 }
62
63 /* transmit */
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,
71 u32 reason);
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,
88 struct smc_link *lnk,
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;
96
97 #endif /* SMC_LLC_H */