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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 | |
| 20 | struct tcp_sock; |
| 21 | struct inet_request_sock; |
| 22 | struct sock; |
| 23 | |
| 24 | #define SMC_MAX_PNETID_LEN 16 /* Max. length of PNET id */ |
| 25 | |
| 26 | struct 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 | |
| 34 | struct smcd_gid { |
| 35 | u64 gid; |
| 36 | u64 gid_ext; |
| 37 | }; |
| 38 | |
| 39 | struct 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 | |
| 57 | enum { |
| 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 | |
| 64 | struct 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 */ |
| 107 |
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