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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* Definitions for the SMC module (socket related)
*
* Copyright IBM Corp. 2016
*
* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
*/
#ifndef _SMC_H
#define _SMC_H
#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <linux/dibs.h>
struct tcp_sock;
struct inet_request_sock;
struct sock;
#define SMC_MAX_PNETID_LEN 16 /* Max. length of PNET id */
struct smc_hashinfo {
rwlock_t lock;
struct hlist_head ht;
};
/* SMCD/ISM device driver interface */
#define ISM_RESERVED_VLANID 0x1FFF
struct smcd_gid {
u64 gid;
u64 gid_ext;
};
struct smcd_dev {
struct dibs_dev *dibs;
struct list_head list;
spinlock_t lock;
struct smc_connection **conn;
struct list_head vlan;
struct workqueue_struct *event_wq;
u8 pnetid[SMC_MAX_PNETID_LEN];
bool pnetid_by_user;
struct list_head lgr_list;
spinlock_t lgr_lock;
atomic_t lgr_cnt;
wait_queue_head_t lgrs_deleted;
u8 going_away : 1;
};
#define SMC_HS_CTRL_NAME_MAX 16
enum {
/* ops can be inherit from init_net */
SMC_HS_CTRL_FLAG_INHERITABLE = 0x1,
SMC_HS_CTRL_ALL_FLAGS = SMC_HS_CTRL_FLAG_INHERITABLE,
};
struct smc_hs_ctrl {
/* private */
struct list_head list;
struct module *owner;
/* public */
/* unique name */
char name[SMC_HS_CTRL_NAME_MAX];
int flags;
/* Invoked before computing SMC option for SYN packets.
* We can control whether to set SMC options by returning various value.
* Return 0 to disable SMC, or return any other value to enable it.
*/
int (*syn_option)(struct tcp_sock *tp);
/* Invoked before Set up SMC options for SYN-ACK packets
* We can control whether to respond SMC options by returning various
* value. Return 0 to disable SMC, or return any other value to enable
* it.
*/
int (*synack_option)(const struct tcp_sock *tp,
struct inet_request_sock *ireq);
};
#if IS_ENABLED(CONFIG_SMC_HS_CTRL_BPF)
#define smc_call_hsbpf(init_val, tp, func, ...) ({ \
typeof(init_val) __ret = (init_val); \
struct smc_hs_ctrl *ctrl; \
rcu_read_lock(); \
ctrl = rcu_dereference(sock_net((struct sock *)(tp))->smc.hs_ctrl); \
if (ctrl && ctrl->func) \
__ret = ctrl->func(tp, ##__VA_ARGS__); \
rcu_read_unlock(); \
__ret; \
})
#else
#define smc_call_hsbpf(init_val, tp, ...) ({ (void)(tp); (init_val); })
#endif /* CONFIG_SMC_HS_CTRL_BPF */
#endif /* _SMC_H */
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