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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 * Definitions for the SMC module (socket related)
6 *
7 * Copyright IBM Corp. 2016
8 *
9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
10 */
11#ifndef _SMC_H
12#define _SMC_H
13
14#include <linux/device.h>
15#include <linux/spinlock.h>
16#include <linux/types.h>
17#include <linux/wait.h>
18#include <linux/dibs.h>
19
20struct tcp_sock;
21struct inet_request_sock;
22struct sock;
23
24#define SMC_MAX_PNETID_LEN 16 /* Max. length of PNET id */
25
26struct smc_hashinfo {
27 rwlock_t lock;
28 struct hlist_head ht;
29};
30
31/* SMCD/ISM device driver interface */
32#define ISM_RESERVED_VLANID 0x1FFF
33
34struct smcd_gid {
35 u64 gid;
36 u64 gid_ext;
37};
38
39struct smcd_dev {
40 struct dibs_dev *dibs;
41 struct list_head list;
42 spinlock_t lock;
43 struct smc_connection **conn;
44 struct list_head vlan;
45 struct workqueue_struct *event_wq;
46 u8 pnetid[SMC_MAX_PNETID_LEN];
47 bool pnetid_by_user;
48 struct list_head lgr_list;
49 spinlock_t lgr_lock;
50 atomic_t lgr_cnt;
51 wait_queue_head_t lgrs_deleted;
52 u8 going_away : 1;
53};
54
55#define SMC_HS_CTRL_NAME_MAX 16
56
57enum {
58 /* ops can be inherit from init_net */
59 SMC_HS_CTRL_FLAG_INHERITABLE = 0x1,
60
61 SMC_HS_CTRL_ALL_FLAGS = SMC_HS_CTRL_FLAG_INHERITABLE,
62};
63
64struct smc_hs_ctrl {
65 /* private */
66
67 struct list_head list;
68 struct module *owner;
69
70 /* public */
71
72 /* unique name */
73 char name[SMC_HS_CTRL_NAME_MAX];
74 int flags;
75
76 /* Invoked before computing SMC option for SYN packets.
77 * We can control whether to set SMC options by returning various value.
78 * Return 0 to disable SMC, or return any other value to enable it.
79 */
80 int (*syn_option)(struct tcp_sock *tp);
81
82 /* Invoked before Set up SMC options for SYN-ACK packets
83 * We can control whether to respond SMC options by returning various
84 * value. Return 0 to disable SMC, or return any other value to enable
85 * it.
86 */
87 int (*synack_option)(const struct tcp_sock *tp,
88 struct inet_request_sock *ireq);
89};
90
91#if IS_ENABLED(CONFIG_SMC_HS_CTRL_BPF)
92#define smc_call_hsbpf(init_val, tp, func, ...) ({ \
93 typeof(init_val) __ret = (init_val); \
94 struct smc_hs_ctrl *ctrl; \
95 rcu_read_lock(); \
96 ctrl = rcu_dereference(sock_net((struct sock *)(tp))->smc.hs_ctrl); \
97 if (ctrl && ctrl->func) \
98 __ret = ctrl->func(tp, ##__VA_ARGS__); \
99 rcu_read_unlock(); \
100 __ret; \
101})
102#else
103#define smc_call_hsbpf(init_val, tp, ...) ({ (void)(tp); (init_val); })
104#endif /* CONFIG_SMC_HS_CTRL_BPF */
105
106#endif /* _SMC_H */