[mirror_ubuntu-focal-kernel.git] / net / smc / smc.h

/*
 *  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/socket.h>
#include <linux/types.h>
#include <net/sock.h>

#define SMCPROTO_SMC		0	/* SMC protocol */

#define SMC_MAX_PORTS		2	/* Max # of ports */

enum smc_state {		/* possible states of an SMC socket */
	SMC_ACTIVE	= 1,
	SMC_INIT	= 2,
	SMC_CLOSED	= 7,
	SMC_LISTEN	= 10,
};

struct smc_sock {				/* smc sock container */
	struct sock		sk;
	struct socket		*clcsock;	/* internal tcp socket */
	struct sockaddr		*addr;		/* inet connect address */
	struct smc_sock		*listen_smc;	/* listen parent */
	struct work_struct	tcp_listen_work;/* handle tcp socket accepts */
	struct work_struct	smc_listen_work;/* prepare new accept socket */
	struct list_head	accept_q;	/* sockets to be accepted */
	spinlock_t		accept_q_lock;	/* protects accept_q */
	bool			use_fallback;	/* fallback to tcp */
};

static inline struct smc_sock *smc_sk(const struct sock *sk)
{
	return (struct smc_sock *)sk;
}

#define SMC_SYSTEMID_LEN		8

extern u8	local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */

#ifdef CONFIG_XFRM
static inline bool using_ipsec(struct smc_sock *smc)
{
	return (smc->clcsock->sk->sk_policy[0] ||
		smc->clcsock->sk->sk_policy[1]) ? 1 : 0;
}
#else
static inline bool using_ipsec(struct smc_sock *smc)
{
	return 0;
}
#endif

int smc_netinfo_by_tcpsk(struct socket *clcsock, __be32 *subnet,
			 u8 *prefix_len);

#endif	/* __SMC_H */
Commit	Line	Data
ac713874 UB	1	/*
	2	* Shared Memory Communications over RDMA (SMC-R) and RoCE
	3	*
	4	* Definitions for the SMC module (socket related)
	5	*
	6	* Copyright IBM Corp. 2016
	7	*
	8	* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
	9	*/
	10	#ifndef __SMC_H
	11	#define __SMC_H
	12
	13	#include <linux/socket.h>
	14	#include <linux/types.h>
	15	#include <net/sock.h>
	16
	17	#define SMCPROTO_SMC 0 /* SMC protocol */
	18
a4cf0443 UB	19	#define SMC_MAX_PORTS 2 /* Max # of ports */
a4cf0443 UB	20
ac713874 UB	21	enum smc_state { /* possible states of an SMC socket */
	22	SMC_ACTIVE = 1,
	23	SMC_INIT = 2,
	24	SMC_CLOSED = 7,
	25	SMC_LISTEN = 10,
	26	};
	27
	28	struct smc_sock { /* smc sock container */
	29	struct sock sk;
	30	struct socket clcsock; / internal tcp socket */
a046d57d UB	31	struct sockaddr addr; / inet connect address */
	32	struct smc_sock listen_smc; / listen parent */
	33	struct work_struct tcp_listen_work;/* handle tcp socket accepts */
	34	struct work_struct smc_listen_work;/* prepare new accept socket */
	35	struct list_head accept_q; /* sockets to be accepted */
	36	spinlock_t accept_q_lock; /* protects accept_q */
ac713874 UB	37	bool use_fallback; /* fallback to tcp */
	38	};
	39
	40	static inline struct smc_sock smc_sk(const struct sock sk)
	41	{
	42	return (struct smc_sock *)sk;
	43	}
	44
a4cf0443 UB	45	#define SMC_SYSTEMID_LEN 8
	46
	47	extern u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */
	48
a046d57d UB	49	#ifdef CONFIG_XFRM
	50	static inline bool using_ipsec(struct smc_sock *smc)
	51	{
	52	return (smc->clcsock->sk->sk_policy[0] \|\|
	53	smc->clcsock->sk->sk_policy[1]) ? 1 : 0;
	54	}
	55	#else
	56	static inline bool using_ipsec(struct smc_sock *smc)
	57	{
	58	return 0;
	59	}
	60	#endif
	61
	62	int smc_netinfo_by_tcpsk(struct socket clcsock, __be32 subnet,
	63	u8 *prefix_len);
	64
ac713874	65	#endif /* __SMC_H */